DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager General Description Features The AAT3673 BatteryManager is a highly integrated single-cell (4.2V) lithium-ion/polymer battery charger and system power management IC that enables simultaneous battery charging and system load management. For increased safety, the AAT3673 includes over-voltage input protection (OVP) up to 28V. * System Load Power Control from Either ADP or Battery * ADP Presence Automatically Routes Power from Source to Load and Charges Battery * Automatic Charge Reduction Loop to Minimize Charge Time with USB Input * 4.0V~6.5V Input Voltage Range * Over-Voltage Input Protection (OVP) up to 28V * Digitally Controlled Thermal Protection * Battery Power Enable * Programmable Battery Charge Timer * Battery Cell Temperature Sensing * Charge Status Reporting (LEDs) * Automatic Recharge Sequencing * Battery Over-Voltage, Over-Current, and Over-Temperature Protection * System Load Current Limiting * 16-pin 4 x 4mm TDFN Package The AAT3673 provides charging current and system power management from a single input that may be supplied by an AC adapter or USB port power source (ADP). This device allows the user to program the battery charge current up to 1.6A depending on the current shared with the system output. A battery charge timeout timer is provided for charging safety and the charge termination current is also user-programmable. The AAT3673 employs a battery charge current reduction function that enables continued system operation in the event the input source can not supply the required load current. When operated under excessive thermal conditions, the AAT3673 has a digitally controlled thermal loop which allows the maximum possible charging current for any given ambient temperature condition. Battery temperature, voltage and charge state are monitored for fault conditions. The AAT3673-1/-2/-4/-5 has two status monitor output pins (STAT1 and STAT2), and the AAT3673-3/-6 has one status monitor output (STAT1) provided to indicate battery charge status by directly driving external LEDs. Applications * * * * * * Cellular Phones Digital Still Cameras Digital Video Cameras Global Positioning Systems (GPS) MP3 Players Handheld PCs The AAT3673 is available in a Pb-free, thermally enhanced, space-saving 16-pin 4 x 4mm TDFN package. Typical Application System Load STAT2 Adapter Input ADP BYP CADP 10F CBAT 10F Enable Battery to Out RTERM TS ENO Enable Battery to Out CHR Threshold ENBAT CT TERM RADP Battery Pack CHRADP ADPSET Temp Enable Input to Output CHR Threshold ENBAT EN2 TS ENO CBAT 10F BYP 10k EN2 Temp Enable Input to Output AAT3673-3/-6 EN1 10k EN BAT EN1 AAT3673-1/-2/-4/-5 Enable BAT+ ADP BAT Adapter Input OUT STAT1 BAT+ CADP 10F System Load OUT STAT1 CHRADP ADPSET BYP TERM GND CBYP CT RADP RTERM Battery Pack CT BYP GND CBYP Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 CT 1 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Pin Descriptions Pin # Name Type 1 ADPSET I 2 ADP I 3 BYP I 4 STAT1 O STAT2 O EN2 I GND I/O EN I EN1 I 8 ENO I 9 ENBAT I 10, 11 BAT I/O 12 CHRADP I 13 TERM I 14 TS I 15 OUT O 16 CT I EP EP I/O 5 6 7 2 Function Connect a resistor from this pin to GND to set the ADP fast charge constant current. The programmed constant current level should be less than the ADP current limit set by ADPLIM specification (ILIM_ADP). Adapter input, source of system load and battery charging. Connect a 1F (minimum) ceramic capacitor as close as possible between ADP and GND. Input for the over-voltage protection bypass node. Connect a 1F (minimum) ceramic capacitor between this pin and GND. This open-drain MOSFET device is for charger status reporting. If used for status indication display, connect an LED Cathode to this node with a series ballast resistor. Connect the LED anode to OUT or BYP. AAT3673-1/-2/-4/-5: This open-drain MOSFET device is for charger status reporting. If used for status indication display, connect an LED cathode to this node with a series ballast resistor. Connect the LED anode to OUT or BYP. AAT3673-3/-6: The EN2 pin (internal pull-up) is used together with the EN1 pin; see Table 2 in the "Functional Description" section of this datasheet. Common ground connection. AAT3673-1/-2/-4/-5: Input enable (internal pull-up). Low to enable the ADP switch and battery charging path; high to disable the ADP switch and battery charging function. See Table 1 in the "Functional Description" section of this datasheet. AAT3673-3/-6: The EN1 pin (internal pull-up) is used together with the EN2 pin; see Table 2 in the "Functional Description" section of this datasheet. Enable Input power to OUT, the dynamic power path from the ADP input to the system load. Active low input (internal pull-up). Battery load switch enable, active low. Battery load switch control the power path between the battery cell and OUT (internal pull-up). Battery pack (+) connection. For best operation, a 1F (minimum) ceramic capacitor should be placed as close as possible between BAT and GND. Adaptor mode charge reduction voltage threshold programming pin. The ADP charge reduction threshold may be adjusted from the default value by placing a voltage divider between this pin to VADP and GND to this pin. Connect a resistor between this pin and GND to program the charge termination current threshold. The charge termination current level can be disabled by connecting this pin to BYP. Battery temperature sensing input. For typical applications, connect a 10k resistor from BYP to this pin and a 10k NTC thermistor located inside the battery pack under charge to this pin and GND to sense battery over temperature conditions during the charge cycle. To disable the TS function, connect this pin to GND. System dynamic power output supplied from the ADP input, BAT or both. Connect a 10F ceramic capacitor between this pin and GND. Battery charge timer input pin, connect a capacitor on this pin to set the ADP charge timers. Typically, a 0.1F ceramic capacitor is connected between this pin and GND. To disable the timer circuit function, connect this pin directly to GND. Exposed paddle (package bottom). Connect to GND plane under the device. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Pin Configuration TDFN44-16 (Top View) AAT3673-1/-2/-4/-5 ADPSET ADP BYP STAT1 STAT2 GND EN ENO 1 16 2 15 3 14 4 13 5 EP 12 6 11 7 10 8 9 CT OUT TS TERM CHRADP BAT BAT ENBAT AAT3673-3/-6 ADPSET ADP BYP STAT1 EN2 GND EN1 ENO 1 16 2 15 3 14 4 5 EP 13 12 6 11 7 10 8 9 CT OUT TS TERM CHRADP BAT BAT ENBAT Absolute Maximum Ratings Symbol VIN VP Description ADP Continuous BAT, OUT, BYP <30ms, Duty Cycle < 10% EN/EN1, ENO, ENBAT, STAT1, STAT2/EN2 TS, CT, ADPSET, TERM, CHRADP Junction Temperature Range Operating Temperature Range Maximum Soldering Temperature (at Leads, 10 sec) VN TJ TA TLEAD Value 30 -0.3 to 8 -0.3 to 8 -0.3 to 8 -40 to 150 -25 to 85 300 Units V C Thermal Information1, 2 Symbol JA JC PD Description Maximum Thermal Resistance Maximum Thermal Resistance Maximum Power Dissipation Value 46 26 2.0 Units C/W W 1. Mounted on 1.6mm thick FR4 circuit board. 2. Derate 50mW/C above 25C ambient temperature. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 3 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Electrical Characteristics VADP = 5V, TA = -25C to +85C; unless otherwise noted, typical values are TA = 25C. Symbol Description Operation VOVP VADP VBAT Conditions Input Over Voltage Protection Range AC Adapter / USB Operating Voltage Range Battery Operating Voltage Range VOUT ADP to OUT Voltage Regulation VDO ADP to OUT Regulator Dropout1 VUVLO_ADP ADP Under-Voltage Lockout VUVLO_BAT BAT Under-Voltage Lockout IADP_OP ADP Normal Operating Current ADP Shutdown Mode Current (OVP is Still Active) IADP_SHDN IBAT_OP Battery Operating Current IBAT_SLP Battery Sleep Current IBAT_SHDN Leakage Current from BAT Pin Over-Voltage Protection VOVPT Over-Voltage Protection Trip Voltage Dropout Voltage Between ADP and BYP Pins VDO_OVP TRESPOV Over-Voltage Protection Response Time Options -1, -2, -3 TOVPON_130s OVP Switch Release Delay Time TOVPSTARTON_130s OVP Switch Start Up Delay Time VADP = 5V, IOUT = 100mA, TA = 25C VADP = 4.8V to 6.5V, IOUT = 0mA to 400mA, TA = -25C to +85C IOUT = 400mA Rising Edge Hysteresis Rising Edge Hysteresis VADP = 5V, VEN = 0V, ICC = 1A VADP = 5V, VEN = 5V, VENBAT = 5V, No Load VBAT = VCO(REG), VADP = VENBAT = GND No Load VBAT = VCO(REG), VADP = 5V, VEN = VENBAT = 5V VBAT = VCO(REG), VENBAT = VADP = 5V VADP Rising Edge Hysteresis VADP = 5V, IADP = 500mA Step up VADP from 6V to 8V Min Typ Max 28 6.5 4.0 3.0 4.33 4.40 VCO(REG) 4.47 4.26 4.4 4.54 150 3.1 0.1 2.9 0.1 0.8 250 3.9 2.8 Units 3.0 1.6 V mV V mA 360 100 250 5 10 A 2 6.5 VADP voltage step down from 8V to 6V, RLOAD = 100, CBYP = 1F VADP voltage step up from 0V to 5V, RLOAD = 100, CBYP = 1F 6.75 100 100 0.5 7.0 200 V mV s 130 s 150 Options -4, -5, -6 TOVPON_80ms OVP Switch Release Delay Time TOVPSTARTON_80ms OVP Switch Start Up Delay Time Power Switches ADP-to-OUT FET On Resistance RDS(ON)_SWA RDS(ON)_SWB BAT-to-OUT FET On Resistance RDS(ON)_CHA ADP Battery Charging FET On-Resistance Battery Charge Voltage Regulation Output Charge Voltage Regulation VCO(REG) Preconditioning Voltage Threshold VMIN VRCH VADP voltage step down from 8V to 6V, RLOAD = 100, CBYP = 1F VADP voltage step up from 0V to 5V, RLOAD = 100, CBYP = 1F Default ADP Charge Reduction Threshold VCHR_REG CHRADP Pin Voltage Accuracy ms 80 VADP = 5.0V VBAT = 4.1V VADP = 5.0V 600 60 600 4.158 2.8 VCO(REG) - 0.17 Battery Recharge Voltage Threshold VCHR_TH 80 CHRADP Open; Reduce Charge Current When ADP is Below VCHR_TH VADP = 4.5V 4.20 2.9 VCO(REG) - 0.1 m 4.242 3.0 VCO(REG) - 0.05 4.5 1.9 2.0 2.1 1. VDO is defined as VADP - VOUT when VOUT is 98% of normal. 4 Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 V DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Electrical Characteristics (continued) VADP = 5V, TA = -25C to +85C; unless otherwise noted, typical values are TA = 25C. Symbol Description Current Regulation ADP Current Limit (Fixed) ILIM_ADP BAT_OUT Current Limit (Fixed) ILIM_BAT ICH_CC_ADP ADP Charge Constant Current Charge Range ICH_CC_ADP/ Constant Current Charge Current Regulation Tolerance ICH_CC_ADP ICH_TKL_ADP Conditions ICH_CC_ADP = 1A Min TC TTKL Output Low Voltage Fast Charge (Trickle Charge + Constant Current + Constant Voltage Charges Together) Timeout Trickle Charge Timeout VOVP Battery Over-Voltage Protection Threshold IOCP TS1 TS2 Battery Charge Over-Current Protection Threshold High Temperature Threshold Low Temperature Threshold Digital Thermal Loop Entry Threshold Digital Thermal Loop Exit Threshold Digital Thermal Loop Regulated Temperature TLOOP_IN TLOOP_OUT TLOOP_REG TSHDN Chip Thermal Shutdown Temperature Units 1600 mA -12 12 % A % ICH_CC_ADP 10 VADPSET VTERM VSTATx Max 1.6 2.3 100 ADP Trickle Charge Current ADPSET Pin Voltage Regulation TERM Pin Voltage Regulation Constant Current Charge Current Set Factor: ICH_ADP/ KI_CC_ADP IADPSET KI_TERM Termination Current Set Factor: ICH_TERM/ITERM AAT3673-3 Only ICH_LO USB Low Level Charge Current (Fixed) USB High Level Charge Current (Fixed) ICH_HI Logic Control/Protection Input High Threshold VEN Input Low Threshold Typ 2 2 V 29300 2000 VEN1 = VEN2 = 0 VEN1 = 0; VEN2 = 5V 85 450 100 500 mA 1.6 0.4 STATx Pin Sinks 8mA CCT = 0.1F 7 VCO(REG) + 0.1 In All Modes Threshold Threshold Threshold Hysteresis V 0.4 28 58 TC/8 VCO(REG) + 0.15 100 30 60 115 95 100 140 15 Hour Min VCO(REG) + 0.2 % ICH_CC 32 62 Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 V % VBYP C 5 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Typical Characteristics 1.2 Constant Current Pre-Conditioning IQ (mA) 1.1 1.0 0.9 0.8 0.7 10 100 1000 Constant Charge Current vs. RADP Constant Charge Current (mA) Adapter Supply Operating Current vs. RADPSET 10000 Constant Current Pre-Conditioning 1000 100 10 1 10 100 RSET (k) RADP (k) Output Charge Voltage Regulation Accuracy vs. Adapter Voltage Constant Output Charge Voltage vs. Temperature (VCO(REG) = 4.2V) 4.201 Battery Voltage (V) 0.25 Accuracy (%) 0.20 0.15 0.10 0.05 0.00 -0.05 -0.10 -0.15 4.200 4.199 4.198 4.197 4.196 4.195 -0.20 4.194 -0.25 4.193 -25 5 5.25 5.5 5.75 6 6.25 6.5 -15 -5 5 25 35 45 55 65 75 85 Operating Current vs. Temperature 6.0 0.90 5.8 0.88 5.6 0.86 0.84 5.4 IOP (mA) Battery Sleep Current (A) Battery Sleep Current vs. Temperature 5.2 5.0 4.8 0.82 0.80 0.78 4.6 0.76 4.4 0.74 4.2 0.72 -15 -5 5 15 25 35 45 Temperature (C) 6 15 Temperature (C) VADP (V) 4.0 -25 1000 55 65 75 85 0.70 -25 -15 -5 5 15 25 35 45 55 Temperature (C) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 65 75 85 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Constant Charging Current vs. Adapter Voltage Charging Current vs. Battery Voltage 1200 1100 Chargin Current (mA) Constant Charging Current (mA) Typical Characteristics 1050 1000 950 900 850 VBAT = 3.6V VBAT = 3.9V VBAT = 4.1V 800 750 700 4 4.25 4.5 4.75 5 5.25 5.5 5.75 6 6.25 1A 500mA 100mA 1000 800 600 400 200 0 2.5 6.5 2.75 3 Preconditioning Voltage Threshold vs. Temperature Battery Voltage (V) 2.94 2.93 2.92 2.91 2.90 2.89 2.88 2.87 2.86 -25 -15 -5 5 15 25 35 45 3.5 3.75 4 4.25 4.5 Battery Voltage (V) 55 65 75 85 Constant Charging Current (mA) Adapter Voltage (V) 3.25 Preconditioning Voltage Threshold vs. Adapter Voltage 2.94 2.93 2.92 2.91 2.90 2.89 2.88 2.87 2.86 4.5 4.75 5 Temperature (C) 5.25 5.5 5.75 6 6.25 6.5 Adapter Voltage (V) Recharge Voltage Threshold vs. Temperature Adapter Charging Current vs. Output Current (VADP = 5V; RSET = 56.7k) (VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 0V) 4.16 Adapter Current (A) Battery Voltage (V) 2.0 4.14 4.12 4.10 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 IADP IBAT 0.2 4.08 -40 0.0 -15 10 35 Temperature (C) 60 85 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 Output Current (A) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 7 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Typical Characteristics (1A Charging Setting) ADP Voltage (top) (V) 4 500mA 0 500mA 1A 4 0 1A 0 Time Time Over-Voltage Trip Voltage vs. Temperature Over-Voltage Trip Voltage Accuracy vs. Temperature 6.80 0.50 6.79 0.40 0.30 6.78 Accuracy (%) Adapter Voltage (V) 0 5 4.5 ADP Voltage (top) (V) 5 4.5 6.77 6.76 6.75 6.74 6.73 0.20 0.10 0.00 -0.10 -0.20 6.72 -0.30 6.71 -0.40 6.70 -25 -15 -5 5 15 25 35 45 55 65 75 -0.50 -25 85 -15 -5 Temperature (C) 15 25 35 45 55 65 75 85 LDO Dropout Voltage vs. Load Current 1.00 450 Full Charge Trickle Charge 0.90 0.80 400 350 0.70 VDO (mV) Capacitance (F) 5 Temperature (C) CT Pin Capacitance vs. Counter Timeout 0.60 0.50 0.40 0.30 300 250 200 150 0.20 100 0.10 50 0.00 85C 25C -40C 0 0 1 2 3 4 Time (hours) 8 ADP Charge Current (middle) ADP Peripheral Current (bottom) (0.5A/div) ADP Charge Current ADP Charge Current (middle) ADP Peripheral Current (bottom) (0.5A/div) ADP Charge Current (500mA Charging Setting) 5 6 7 0 200 400 600 800 Load Current (A) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 1000 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager LDO Output Voltage Noise LDO Power Supply Rejection Ratio, PSRR (IOUT = 10mA, Power BW: 100Hz to 300KHz) (VADP = 5V, IOUT = 10mA, BW: 50Hz to 300KHz) 600 70 500 60 Magnitude (dB) Noise (VRMS) Typical Characteristics 400 300 200 100 50 40 30 20 10 0 100 1000 10000 100000 0 100 1000000 1000 Frequency (Hz) ADP to BYP RDS(ON) vs. Battery Voltage 100 350 85C 25C -25C 90 80 300 RDS(ON) (m) BAT to OUT RDS(ON) (m) 100000 Frequency (Hz) BAT to OUT RDS(ON) vs. Battery Voltage 70 60 50 40 250 200 150 100 85C 25C -25C 50 30 20 3 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 0 4.5 4.2 4.75 5 5.25 VBAT (V) ADP to Bypass RDS(ON) (m) 70 60 50 40 30 20 10 -15 -5 5 15 25 35 5.75 6 6.25 6.5 ADP to BYP RDS(ON) vs. Temperature 80 0 -25 5.5 VBAT (V) BAT to OUT RDS(ON) vs. Temperature BAT to OUT RDS(ON) (m) 10000 45 Temperature (C) 55 65 75 85 350 300 250 200 150 100 50 0 -25 -15 -5 5 15 25 35 45 55 65 75 85 Temperature (C) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 9 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager High Temperature Threshold Low Temperature Threshold (VADP = 5V) (VADP = 5V) 32 62 31.5 61.5 Low Temperature Threshold, TS2 (%) High Temperature Threshold, TS1 (%) Typical Characteristics 31 30.5 30 29.5 29 28.5 28 -25 -15 -5 5 15 25 35 45 55 65 75 61 60.5 60 59.5 59 58.5 58 -25 85 -15 -5 5 Temperature (C) -25C 25C 85C 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 5 5.25 5.5 5.75 35 45 55 65 75 85 Input Low Threshold vs. Adapter Voltage 6 6.25 6.5 VEN1(L); VEN2(L); VENO(L); VENBAT(L) (V) VEN1(H); VEN2(H); VENO(H); VENBAT(H) (V) 1.4 4.75 25 Temperature (C) Input High Threshold vs. Adapter Voltage 4.5 15 1.4 -25C 25C 85C 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 4.5 4.75 5 5.25 5.5 5.75 6 6.25 6.5 VADP (V) ADP to OUT RDS(ON) vs. Temperature OVP Switch Turn-On Time (VADP = 6.75V 5V; VOVPT = 6.75V; ICH = 1A) 12 VADP, VBYP (2V/div) 500 400 300 200 100 0 -25 -15 -5 5 15 25 35 45 Temperature (C) 10 4 VADP VBYP ICH 10 55 65 75 8 3.5 3 6 2.5 4 2 2 1.5 0 1 -2 0.5 -4 0 85 Time (100s/div) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 ICH (A) ADP to OUT RDS(ON) (m) 600 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Typical Characteristics OVP Event Transient OVP Event Transient (VADP = 6.3V 8V; VOVPT = 6.75V; ICH_CC = 1A) (VADP = 6.3V 8V; VOVPT = 6.75V; ICH_CC = 1A) 8 VADP VBYP ICH 4 12 3.5 10 3 2.5 4 2 2 1.5 8 4 VADP VBYP ICH 3.5 3 6 2.5 4 2 2 1.5 0 1 0 1 -2 0.5 -2 0.5 -4 0 -4 0 ICH (A) 6 ICH (A) VADP, VBYP (2V/div) 10 VADP, VBYP (2V/div) 12 Response of Out when Switching from VBAT to VADP Response of Out when Switching from VADP to VBAT (VADP = 0V 5V; VBAT = 3.6V; RLOAD = 50; ENBAT = 0V; ENO = 0V; COUT = 10F) (VADP = 5V 0V; VBAT = 3.6V; RLOAD = 50; ENBAT = 0V; ENO = 0V; COUT = 10F) 8 7 6 4.2 VADP VOUT VBAT 4.1 4 5 3.9 4 3.8 3 3.7 2 3.6 1 3.5 0 3.4 VADP, VOUT, VBAT (2V/div) Time (5s/div) VADP, VOUT, VBAT (2V/div) Time (1s/div) 4.2 8 VADP VOUT VBAT 7 6 4.1 4 5 3.9 4 3.8 3 3.7 2 3.6 1 3.5 0 3.4 Time (100s/div) Time (200s/div) (VADP = 5V 0V; VBAT = 3.6V; RLOAD = 50; ENBAT = 5V; ENO = 0V; COUT = 10F) 8 4.2 VADP VOUT VBAT 7 6 4.1 4 5 3.9 4 3.8 3 3.7 2 3.6 1 3.5 0 3.4 Time (200s/div) VADP, VOUT, VBAT (2V/div) Response of Out when Switching from VADP to VBAT (VADP = 0V 5V; VBAT = 3.6V; RLOAD = 50; ENBAT = 5V; ENO = 0V; COUT = 10F) VADP, VBAT, VOUT (2V/div) Response of Out when Switching from VBAT to VADP 4.2 8 VADP VOUT VBAT 7 6 5 4.1 4 3.9 4 3.8 3 3.7 2 3.6 1 3.5 0 3.4 Time (1ms/div) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 11 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Typical Characteristics Response of Out when ENO = 5V (VADP = 5V 0V; VBAT = 3.6V; RLOAD = 50; ENBAT = 0V; COUT = 10F) VADP, VOUT, VBAT (2V/div) 8 4.2 VADP VOUT VBAT 7 6 4.1 4 5 3.9 4 3.8 3 3.7 2 3.6 1 3.5 0 3.4 VADP, VOUT, VBAT (2V/div) Response of Out when ENO = 5V (VADP = 0V 5V; VBAT = 3.6V; RLOAD = 50; ENBAT = 0V; COUT = 10F) 8 4.2 VADP VOUT VBAT 7 6 3.9 4 3.8 3 3.7 2 3.6 1 3.5 0 3.4 Response of Out when Removing Battery (VBAT = 0V 3.6V; VADP = 5V; RLOAD = 50; ENBAT = 0V; ENO = 0V; COUT = 10F) (VBAT = 4.1V 0V; VADP = 5V; RLOAD = 50; ENBAT = 0V; ENO = 5V; COUT = 10F) 8 VADP VOUT VBAT 5 4 3 2 1 VADP, VOUT, VBAT (2V/div) VADP, VOUT, VBAT (2V/div) Time (1ms/div) Response of Out when Inserting Battery 6 8 6 5 4 3 2 1 Time (200s/div) Time (500s/div) Response of Out when Inserting Battery Response of Out when Removing Battery (VBAT = 0V 3.6V; RLOAD = 50; VADP = 5V; ENBAT = 5V; ENO = 0V; COUT = 10F) (VBAT = 4.1V 0V; VADP = 5V; RLOAD = 50; ENBAT = 5V; ENO = 0V; COUT = 10F) 8 8 VADP VOUT VBAT 7 6 5 4 3 2 1 0 VADP, VOUT, VBAT (2V/div) VADP, VOUT, VBAT (2V/div) VADP VOUT VBAT 7 0 0 VADP VOUT VBAT 7 6 5 4 3 2 1 0 Time (200s/div) 12 4 5 Time (1ms/div) 7 4.1 Time (500s/div) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Functional Block Diagram BYP ADP to OUT Switch OUT ADP ADP to BAT Sw itch EN/EN1 ENO ENBAT BAT to OUT Switch OVP Sense And Control BAT CT TERM Charge System Control TS Voltage Sense ADPSET CHRADP STAT1 STAT2/EN2 Functional Description The AAT3673 is a single input dynamic battery charger and power control IC. The input power control is designed to be compatible with either AC power adapter or USB port power sources. In addition, this device also provides dynamic power control to charge a single cell Li-ion battery and power a system load simultaneously. The OUT pin provides regulated 4.4V when input requirement is met. If the input voltage is not sufficiently high to ensure regulated OUT, the output will track input assuming the drop through the switch ADP to BAT or BAT to OUT. The device contains a charge regulation pass devices to control the charge current or voltage from the adapter input power to the battery, it also contains two additional load switches to control and route input power to supply the system load and manage power from the battery to the system load. This charge control and switch array permits dynamic charging of the battery cell and control of power to the system load simultaneously. Thermal and Current Sense Ref. GND When an input power source is applied to the AAT3673, the adapter input will provide power to the system load and charge the battery. Without a valid supply present on the ADP pin, the battery will power the system load as long as the battery voltage is greater than 2.9V. The internal battery voltage sense circuit will disconnect the battery from the load if the cell voltage falls below 2.9V to protect the battery cell from over-discharge which results in shorter battery life. The system load current drawn from the battery is limited internally. The AAT3673 precisely regulates battery charge current and voltage for 4.2V Li-ion battery cells. The battery charge current can be programmed up to 1.6A. During battery charge, the AAT3673 pre-conditions (trickle charges) the battery with a lower current when the battery voltage is less than 2.9V. The system then charges the battery in a constant current fast charge mode when the battery voltage is above 2.9V. When the battery voltage rises to 4.2V, the charger will automatically switch to a constant voltage mode until the charge current is reduced to the programmed charge termination current threshold. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 13 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager The internal arrangement of load switches and the charge regulation device provide dynamic power sourcing to the system load. If the system load exceeds the input current supply from the input source, additional current can be supplied from the battery cell. At all times, the device will manage distribution of power between the source, the battery and the system simultaneously in order to support system power needs and charge the battery cell with the maximum amount of current possible. The AAT3673 has a unique internal charge current reduction control loop that will prevent an input source from overload. In the case of USB charging from a USB port VUSB supply, there are two events which need to be guarded against. The first is charging from a defective or inadequate USB host supply; the second problem could arise if the programmed charge current plus the system supply demand through the AAT3673 exceeds the ability of a given USB port. In either case, the AAT3673 charge reduction (CHR) loop will activate when the input source drops below the VCHR_TH threshold of 4.5V. The CHR loop will automatically reduce the charge current to the battery until the supply voltage recovers to a point above the VCHR_TH threshold. This unique feature protects the charger, system and source supply in the event an adapter or power source does not meet the programmed ADP charging mode current demand. The resulting CHR system will permit the charging of a battery cell with the maximum possible amount of charge current for any given source. During battery charging, the device temperature can rise due to power dissipation within the charge current control device and the load switches. In some cases, the power dissipation in the device may cause the junction temperature to rise up to its thermal shutdown threshold. In the event of an internal over-temperature condition caused by excessive ambient operating temperature or an excessive power dissipation condition, the AAT3673 utilizes a digitally controlled thermal loop system that will reduce the charging current to prevent the device from entering thermal shutdown. The digital thermal loop will maintain the maximum possible battery charging current for the given set of input to output power dissipation and ambient temperature conditions. 14 The digital thermal loop control is dynamic in the sense that it will continue to adjust the battery charging current as operating conditions change. The digital thermal loop will reset and resume normal operation when the power dissipation or over temperature conditions are removed. Battery temperature and charge state are fully monitored for fault conditions. In the event of an over voltage, over-current, or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. In addition to internal charge controller thermal protection, the AAT3673 also provides a temperature sense feedback function (TS pin) from the battery to shut down the device in the event the battery exceeds its own thermal limit during charging. All fault events are reported to the user by the simple status LED(s) which is (are) internally controlled by open drain NMOS switch(es). Charging Operation The AAT3673 has four basic modes for the battery charge cycle: pre-conditioning/trickle charge, constant current fast charge, constant voltage, and end of charge/ sleep state. Battery Preconditioning Before the start of charging, the AAT3673 checks several conditions in order to assure a safe charging environment. The input supply must be above the minimum operating voltage, or under-voltage lockout threshold (VUVLO), for the charging sequence to begin. Also, the cell temperature, as reported by a thermistor connected to the TS pin from the battery, must be within the proper window for safe charging. When these conditions have been met and a battery is connected to the BAT pin, the AAT3673 checks the state of the battery by sensing the cell voltage. If the cell voltage is below the preconditioning voltage threshold (VMIN), the AAT3673 begins preconditioning the battery cell with charge current which is 10% of the fast charge current. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Fast Charge/Constant Current Charging Battery cell preconditioning continues until the voltage measured by the internal sense circuit exceeds the preconditioning voltage threshold (VMIN). At this point, the AAT3673 begins the fast charge constant current phase. The fast charge constant current (ICH_CC) level is programmed by the user via the RADP resistor. The AAT3673 remains in constant current charge mode until the battery reaches the voltage regulation point, VCO(REG). The formula for fast charge current as a function of current setting resistor is: 2V ICH_CC = KI_CC_ADP * R ADP Battery UVLO Trickle Charge Constant Current Charge Phase (CC) Alternately, to select the resistor value for a given charging current use: 2V RADP = KI_CC_ADP * I CH_CC where KI_CC_ADP = 29300 (typical). Constant Voltage Charging The charge control system transitions to a regulated constant voltage phase from the constant current fast charge mode when the battery voltage reaches the end of charge regulation threshold (VCO(REG)). The regulation voltage level is factory programmed to 4.2V (1%). The charge current in the constant voltage mode drops as the battery cell under charge reaches its maximum capacity. Constant Voltage Charge Phase (CV) Constant Current Charge Phase Constant Voltage Charge Phase Recharge Phase I CH_CC I CH_ CC Termination Phase Termination Phase I CH_ TERM I CH_ TERM VCO( REG) VRCH VMIN VUVLO when when VBAT = VCO( REG) VBAT = VCO( REG) I CH_ TKL Figure 1: Current vs. Voltage and Charger Time Profile. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 15 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Control Inputs Pass Devices EN ENO ENBAT ADP - OUT ADP - BAT BAT - OUT 1 0 1 0 1 0 1 0 1 1 0 0 1 1 0 0 1 1 1 1 0 0 0 0 OFF OFF OFF ON OFF OFF OFF ON OFF ON OFF ON OFF ON OFF ON OFF OFF OFF OFF ON ON ON ON Table 1: AAT3673-1/-4 and AAT3673-2/-5 Battery and Adapter Dynamic Path Control Table. Control Inputs Pass Devices EN1 EN2 ENO ENBAT ADP-OUT ADP-BAT BAT-OUT 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 OFF OFF OFF OFF OFF ON ON ON OFF OFF OFF OFF OFF ON ON ON OFF ON ON ON OFF ON ON ON OFF ON ON ON OFF ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON ON ON ON ON ON Table 2: AAT3673-3/-6 Battery and Adapter Dynamic Path Control Table. End of Charge Cycle Termination and Recharge Sequence When the charge current drops to the user programmed charge termination current at the end of the constant voltage charging phase, the device terminates charging, enables the recharge control circuit and enters the sleep state. The charger will remain in the sleep state until the battery voltage decreases to a level below the battery recharge voltage threshold (VRCH). The charge termination current is programmed via the RTERM resistor which is connected between the TERM pin and ground. Use the values listed in Table 3 to set the desired charge termination current. The programmed charge termination current will remain at the same set level regardless of which fast charge ADP, USBH or USBL constant current mode is selected. 16 ITERM (mA) RTERM (k) 320 174 125 95 77 64 58 50 49 42 37 11.0 21.0 30.9 41.2 51.1 61.9 71.5 80.6 90.9 100.0 110.0 Table 3: Charge Termination Current Programming Resistor Values. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager If the desired end of charge termination current level is not listed in Table 3, the TERM resistor value may be calculated by the following equation: 2V ICH_TERM = KI_TERM * R TERM or 2V RTERM = KI_TERM * I CH_TERM KI_TERM = 2000 (typical) When the input supply is disconnected, the charger also automatically enters power-saving sleep mode. Consuming less than 1A in sleep mode, the AAT3673 minimizes battery drain when not charging. This feature is particularly useful in applications where the input supply level may fall below the usable range of the charge reduction control or under-voltage lockout level. In such cases where the AAT3673 input voltage drops, the device will enter the sleep mode and automatically resume charging once the input supply has recovered from its fault condition. Dynamic Current Regulation There are two possible configurations where the system load current and charge current are dynamically controlled. In the first case, the ADP-BAT switch and the BAT-OUT switch are enabled, and the ADP-OUT switch is disabled. Under this condition, the adapter input current is set by the RSET resistor (fast charge current setting, ICH_CC) and is split between the system load (IBAT-OUT) and the battery charge current (IBAT). The charge current is dynamically adjusted as the system load varies in order to maintain the adapter input current. ICH_CC = IBAT + IBAT-OUT For example: If RSET = 57.6k, the fast charge current is set for 1A. For a system load of 0mA, the battery charge current is 1A. As the system load is increased the battery charge current is reduced, until the system load is equal to 1A and the battery charge current is 0A. Further increases in the system load will result in the battery supplying the balance of the current; a system load of 1.2A requires the battery to supply 0.2A. switch and the ADP-OUT switch are all enabled. Under this condition, the adapter input current is limited internally to 1.6A minimum (ILIM_ADP) and is split between the system load (IADP-OUT) and the battery charge current (ICH_CC). The charge current is dynamically adjusted as the system load varies in order to maintain the adapter input current at or below the 1.6A minimum. ILIM_ADP ICH_CC + IADP-OUT For example: If RSET = 57.6k, the fast charge current is set for 1A. For a system load of 0mA, the battery charge current is 1A and the adapter current is less than 1.6A. As the system load is increased the battery charge current is 1A, until the system load is equal to 0.6A and the adapter input current is 1.6A. Increasing the system load above 0.6A causes the battery charge current to be reduced, until the system load is equal to 1.6A and the battery charge current is 0A. Further increases in the system load will result in the battery supplying the balance of the current; a system load of 1.8A requires the battery to supply 0.2A. Over-Voltage Protection In normal operation, an N-channel MOSFET acts as a slew-rate controlled load switch, connecting and disconnecting the power supply from ADP to BYP. A low resistance MOSFET is used to minimize the voltage drop between the voltage source and the charger and to reduce the power dissipation. When the voltage on the input exceeds the over-voltage trip point of 6.75V, the device turns off the internal switch which disconnects the charger from the abnormal input voltage, therefore preventing any damage to the charger. The OVP turn-on and release delay times for the AAT3673-1/-2/-3 are 150s and 130s respectively, while in the AAT3673-4/-5/-6 these delay times are extended to 80ms typically. If an over-voltage condition is applied at the time of the device enable, then the load switch will remain OFF. OVP Under-Voltage Lockout (UVLO) The AAT3673 OVP circuitry has a fixed 3.1V undervoltage lockout level (UVLO). When the adapter input voltage is less than the UVLO threshold level, the MOSFET load switch is turned off. A 100mV of hysteresis is included to ensure circuit stability. In the second case, the ADP-BAT switch, the BAT-OUT Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 17 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Temperature Sense (TS) Inside the AAT3673, the internal battery temperature sensing circuit is comprised of two comparators which establish a voltage window for safe operation. The thresholds for the TS operating window are bounded by the TS1 and TS2 specifications. Referring to the Electrical Characteristics table in this datasheet, the TS1 threshold = 30% * VBYP and the TS2 threshold = 60% * VBYP. If the use of the TS pin function is not required by the system, it should be terminated to ground. BYP AAT3673 BYP 0.60 x VBYP Battery Cold Fault TS The CT pin is driven by a constant current source and will provide a linear response to increases in the timing capacitor value. The timeout is 7 hours (typical) using a 100nF capacitor for CT. Thus, for a 200nF capacitor it would be 14 hours, and for a 50nF capacitor it would be 3.5 hours respectively. For a given target delay time TD (in hours) calculate: CT = Battery Pack Battery Hot Fault x V BYP Figure 2: AAT3673 Battery Temperature Sensing Circuit. Charge Safety Timer (CT) While monitoring the charge cycle, the AAT3673 utilizes a charge timer to help identify damaged cells and to ensure that the cell is charged safely. Operation is as follows: upon initiating a charging cycle, the AAT3673 charges the 18 cell at 10% of the programmed maximum charge until VBAT >2.9V. If the cell voltage fails to reach the preconditioning threshold of 2.9V (typ) before the safety timer expires, the cell is assumed to be damaged and the charge cycle terminates. If the cell voltage exceeds 2.9V prior to the expiration of the timer, the charge cycle proceeds into fast charge. There are two timeout periods: 50 minutes for Trickle Charge mode, and 6 hours for Constant Current Mode and Constant Voltage mode altogether. (TD * 100nF) 7 If the programmable watchdog timer function is not needed, it can be disabled by terminating the CT pin to ground. The CT pin should not be left floating or unterminated, as this will cause errors in the internal timing control circuit. The constant current provided to charge the timing capacitor is very small, and this pin is susceptible to noise and changes in capacitance value. Therefore, the timing capacitor should be physically located on the printed circuit board layout as close as possible to the CT pin. Since the accuracy of the internal timer is dominated by the capacitance value, a 10% tolerance or better ceramic capacitor is recommended. Ceramic capacitor materials, such as X7R and X5R types, are a good choice for this application. System Operation Flowchart Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager UVLO VADP > VUVLO Yes Power On Reset Yes No Switch On No Thermal Loop Enable Sleep Mode No Enable Dynamic Charge VENBAT > VEN Fault Condition Monitor OV, OT, OC Yes No Shutdown Mode Device Temperature Monitor TJ > 110C No Yes Connect ADP to BAT and OUT Yes Battery Temperature Sense. VTS1 < TS < VTS2 Yes No Thermal Loop Current Reduction Battery Temperature Fault Expire Power Share Charge Timer (Enable on Charger reset) No Recharge Test VRCH > VBAT? No Current Limit Test IOUT > ILIM_ADP Yes Reduce Charging Current to BAT Yes Preconditioning Test VMIN > VBAT IOUT + ICH_CC > ILIM_BAT? Low Current Conditioning Charge Yes Constant Current Charging Mode Yes Constant Voltage Charge Mode Set No Current Phase Test VCO(REG) > VBAT No Voltage Phase Test ICH_CC > ICH_TERM No Yes Charge Reduction Mode No Yes Yes Charge Complete Voltage Regulation Enable Input Voltage Level Test VADP < VCHR_TH Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 No 19 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Applications Information BYP Adapter or USB Port Power Source In the adapter mode, constant current charge levels up to 1.6A may be programmed by the user. The ADP input will operate over a range from 4.0V to 6.5V. The constant fast charge current for the adapter input mode is set by the RADP resistor connected between the ADPSET pin and ground. The battery preconditioning or trickle charge current is fixed at 10% of the programmed fast charge constant current level. Refer to Table 4 for recommended RADP values for a desired constant current charge level. Please refer to the Battery Charge Status Indication discussion on page 21 of this datasheet for further details. BYP R3 1M CHRADP VCH_REG = 2.0 R4 800k Figure 3: Internal Equivalent Circuit for the CHRADP Pin. Charge Reduction Under normal operation, the AAT3673 should be operated from an adapter power source with a sufficient capacity to supply the desired constant charge current plus any additional load which may be placed on the source by the operating system. In the event that the power source to the ADP pin is unable to provide the programmed fast charge constant current, or if the system under charge must also share supply current with other functions, the AAT3673 will automatically reduce the ADP fast charge current level to maintain the integrity of the source supply, power the operating system, and charge the battery cell with the remaining available current. Adapter Input Charge Inhibit and Resume The ADP charge reduction system becomes active when the voltage on the ADP input falls below the ADP charge reduction threshold (VCHR_TH), which is preset to 4.5V. Should the input supply drop below the VCHR_TH threshold, the charge reduction system will reduce the fast charge current level in a linear fashion until the voltage sensed on the ADP input recovers to the charge reduction threshold voltage. The ADP charge reduction threshold (VCHR_TH) may be externally set to a value other than 4.5V by placing a resistor divider network between the BYP pin and ground with the center connected to the CHRADP pin. The ADP charge reduction feature may be disabled by shorting the CHRADP pin directly to the BYP pin. Programming Fast Charge Current The following equation may be used to approximate the ADP charge reduction threshold above or below 4.5V: VCHR_TH = The AAT3673 has an under-voltage lockout (UVLO) and power on reset feature to protect the charger IC in the event the voltage on the BYP pin drops below the UVLO threshold. Under a UVLO condition, the charger will suspend the charging process. When power is applied to the adapter pin again or the UVLO condition recovers, the system charge control will asses the state of charge on the battery cell and will automatically resume charging in the appropriate mode for the condition of the battery. The constant current charge level is user programmable with a set resistor connected between the ADPSET pin and ground. The accuracy of the constant charge current, as well as the preconditioning trickle charge current, is dominated by the tolerance of the set resistor used. For this reason, a 1% tolerance metal film resistor is recommended for the set resistor function. The constant charge current levels from 100mA to 1.6A may be set by selecting the appropriate value from Table 4. Charge current setting formula: ICH_CC_ADP (typ) = VADP * KII_CC_ADP RADP 2.0V (R4/[R4 + R3]) where R4 and R3 500k. 20 Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Battery Connection (BAT) Constant Charge Current (mA) Set Resistor Value (k) 100 200 300 400 500 800 1000 1600 576 287 191 143 113 69.8 56.2 33.4 Battery Charge Status Indication Charge Status Indicator Outputs Table 4: RADP Values. Figure 4 shows the relationship of constant charging current and set resistor values for the AAT3673. Constant Charge Current (mA) A single cell Li-Ion/Polymer battery should be connected between BAT input and ground. There are six device options, which are described in Table 11 on page 26. All options include recharge sequence after adapter is inserted. The AAT3673-1/-4 and AAT36732/-5 have two status (STAT1 and STAT2) pins and one enable pin (EN); the AAT3673-3/-6 has one status pin (STAT1) and two enable pins (EN1 and EN2) Charge State 10000 Pre-Charge Fast-Charge Charge Complete Charge Disabled, Sleep Mode or Fault Condition Constant Current Pre-Conditioning 1000 100 No Battery (with Charge Enabled) STAT1 STAT2 ON ON OFF ON OFF ON OFF OFF Flash (1Hz, 40% duty) Flash (1Hz, 40% duty) 10 Table 6: AAT3673-1/-4 LED Status Indicators. 1 10 100 1000 10000 Charge State RADP (k) Pre-Charge or Fast-Charge Charge Complete, Charge Disabled, or Sleep Mode Fault Condition Figure 4: Constant Charging Current vs. Set Resistor Values. No Battery (with Charge Enabled) For the AAT3673-3/-6, the two enable inputs select between four possible operating modes: two internally fixed charging current modes (USB Low =100mA or USB high = 500mA), an externally programmable charging current mode, and a shutdown mode. The STAT1 functionality is identical for all three modes and does not depend on the EN1 and EN2 enable inputs. EN1 EN2 Operating Mode 0 0 0 1 1 0 1 1 USB Low, 100mA charging current USB High, 500mA charging current Using RADP to program charging current Shutdown mode Table 5: AAT3673-3/-6 Operating Modes. STAT1 STAT2 ON OFF OFF OFF OFF Flash (1Hz, 40% duty) ON OFF Table 7: AAT3673-2/-5 LED Status Indicators. Charge State STAT1 Pre-Charge or Fast-Charge Charge Complete, Charge Disabled, Sleep Mode, or Fault Condition No Battery (with Charge Enabled) ON OFF Flash (1Hz, 40% duty) Table 8: AAT3673-3/-6 LED Status Indicators. Fault condition can be one of the following: * * * * Battery over-voltage (OV) Battery temperature sense hot or cold Battery charge timer time-out Chip thermal shutdown Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 21 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Status Indicator Display Simple system charging status states can be displayed using one LED each in conjunction with the STAT1 and STAT2 pins of the AAT3673-1/-2/-4/-5 and the STAT1 pin of the AAT3673-3/-6. These pins have simple switches connecting the LED's cathodes to ground. Refer to Tables 6, 7, and 8 for LED display definitions. The LED anodes should be connected to BYP or other system power that does not exceed 6.5V, depending upon system design requirements. The LED should be biased with as little current as necessary to create reasonable illumination; therefore, a ballast resistor should be placed between the LED cathode and the STAT1 and STAT2 pins of the AAT3673-1/-2/-4/-5 and the STAT1 pin of the AAT3673-3/-6. A 2mA bias current should be sufficient to drive most low cost green or red LEDs. It is not recommended to exceed 8mA when driving an individual status LED. The required ballast resistor value can be estimated using the following formulas: When connecting to the adapter supply with a red LED: RB(STAT1,2) = VADP - VFLED ILED(STAT1,2) Example: RB(STAT1,2) = 5.5V - 2.0V = 1.75k 2mA Red LED forward voltage (VF) is typically 2.0V @ 2mA. When connecting to the USB supply with a green LED: RB(STAT1,2) = VUSB - VFLED ILED(STAT1,2) Example: RB(STAT1,2) = 5.0V - 3.2V = 900 2mA The thermal management system measures the internal circuit die temperature and reduces the charge current when the device exceeds a preset internal temperature control threshold. Once the thermal loop control becomes active, the constant charge current is initially reduced by a factor of 0.44. The initial thermal loop current can be estimated by the following equation: Constant Charging: ITLOOP = ICCADP * 0.44 The thermal loop control re-evaluates the internal die temperature every three seconds and adjusts the fast charge current back up in small steps up to the full fast charge current level or until an equilibrium current is discovered and maximized for the given ambient temperature condition. In this manner, the thermal loop controls the system charge level. The AAT3673 will always provide the highest possible level of constant current in the fast charge mode for any given ambient temperature condition. Programmable Watchdog Timer The AAT3673 contains a watchdog timing circuit which operates in all charging modes. Typically a 0.1F ceramic capacitor is connected between the CT pin and ground. When a 0.1F ceramic capacitor is used, the device will time a shutdown condition if the trickle charge mode exceeds 50 minutes. When the device transitions from the trickle charge to the fast charge constant current mode and then to the constant voltage mode, the timer counting is continuous but the timeout value changes from 50 minutes to 7 hours. Summary for a 0.1F used for the timing capacitor: Trickle Charge (TC) time out = 50 minutes Trickle Charge (TC) + Fast Charge Constant Current (CC) + Constant Voltage (CV) mode time out = 7 hours Thermal Loop Control The CT pin is driven by a constant current source and will provide a linear response to increases in the timing capacitor value. Thus, if the timing capacitor were to be doubled from the nominal 0.1F value, the time out time of the CC + CV modes would be doubled. The corresponding trickle charge time out time would be the combined CC + CV time divided by 8. Due to the integrated nature of the linear charging control pass devices for both the adapter and USB modes, a special thermal loop control system has been employed to maximize charging current under all operating conditions. If the programmable watchdog timer function is not needed it may be disabled by terminating the CT pin to ground. The CT pin should not be left floating or not terminated; this will cause errors in the internal timing control circuit. Green LED forward voltage (VF) is typically 3.2V @ 2mA. Protection Circuitry 22 Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager The counter input frequency will be divided by two in the event of a fault condition. Such fault conditions include digital thermal loop charge current reduction, battery charge reduction, and battery current sharing with the output during the charging cycle. When the fault condition recovers, the counter will resume the timing function. The charge timer will automatically reset when the AAT3673 enable pin is reset or cycled off and on. The constant current provided to charge the timing capacitor is very small and this pin is susceptible to noise and changes in capacitance value. Therefore, the timing capacitor should be physically located on the printed circuit board layout as close as possible to the CT pin. Since the accuracy of the internal timer is determined by the capacitance value, a 10% tolerance or better ceramic capacitor is recommended. Ceramic capacitor materials such as X7R and X5R type are a good choice for this application. Battery Over-Voltage Protection An over-voltage event is defined as a condition where the voltage on the BAT pin exceeds the maximum battery charge voltage and is set by the over-voltage protection threshold (VBOVP). If an over-voltage condition occurs, the AAT3673 charge control will shutdown the device until voltage on the BAT pin drops below the overvoltage protection threshold (VBOVP). The AAT3673 will resume normal charging operation once the battery over-voltage condition is removed. Over-Temperature Shutdown The AAT3673 has a thermal protection control circuit which will shut down charging functions should the internal die temperature exceed the preset thermal limit threshold. Thermal shutdown also turns off the switches from ADP to OUT and BAT to OUT. Battery Temperature Fault Monitoring In the event of a battery over- or under-temperature condition, the charge control will turn off the internal charge path regulation device and disable the BAT-OUT dynamic path. After the system recovers from a temperature fault, the device will resume charging operation. The AAT3673 checks battery temperature before starting the charge cycle, as well as during all stages of charging. Typically, batteries employ the use of a negative temperature coefficient (NTC) thermistor that is integrated into the battery. Capacitor Selection Input Capacitor A 1F or larger capacitor is typically recommended for CADP. CADP should be located as close to the device ADP pin as practically possible. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for CADP. There is no specific capacitor equivalent series resistance (ESR) requirement for CADP. However, for higher current operation, ceramic capacitors are recommended for CADP due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. Typically, 50V rated capacitors are required for most of the application to prevent any surge voltage. Ceramic capacitors selected as small as 1206 are available which can meet these requirements. Other voltage rating capacitor can also be used for the known input voltage application. Charger Output Capacitor The AAT3673 only requires a 1F ceramic capacitor on the BAT pin to maintain circuit stability. This value should be increased to 10F or more if the battery connection is made any distance from the charger output. System Power Output Capacitor For proper load voltage regulation and operational stability, a capacitor is required between OUT and GND. The output capacitor connection to the ground pin should be made as directly as practically possible for maximum device performance. Since the regulator has been designed to function with very low ESR capacitors, a 10F ceramic capacitor is recommended for best performance. Printed Circuit Board Layout Recommendations For proper thermal management and to take advantage of the low RDS(ON) of the AAT3673, a few circuit board layout rules should be followed: IN and BAT should be routed using wider than normal traces, and GND should be connected to a ground plane. To maximize package thermal dissipation and power handling capacity of the AAT3673 TDFN4x4 package, solder the exposed paddle of the IC onto the thermal landing of the PCB, where the thermal landing is connected to the ground plane. If heat is still an issue, multi-layer boards with dedicated ground planes are recommended. Also, adding more thermal vias on the thermal landing would help transfer heat to the PCB effectively. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 23 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager 24 Figure 4: AAT3673-1/-2/-4/-5 Evaluation Board Top Layer. Figure 5: AAT3673-1/-2/-4/-5 Evaluation Board Bottom Layer. Figure 6: AAT3673-3/-6 Evaluation Board Top Layer. Figure 7: AAT3673-3/-6 Evaluation Board Bottom Layer. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager 5V D1 Green LED +5V U1 4 D2 Red LED TDFN44-16 OUT STAT1 R5 1.5K 5 C5 10F STAT2 R6 1.5K J1 3 2 1 J2 J3 3 2 1 7 BAT 11 BAT 10 BAT EN BYP AAT3673-1/-2/-4/-5 EN 3 2 1 OUT 15 9 ENBAT C2 10F R7 10K TS 14 CT 16 TS ENBAT 8 ENO BYP ENO 2 ADP R3 ADP CHRADP 1 12 ADPSET R4 C4 0.1F 13 C1 10F TERM R2 R1 BYP GND R8 10K 3 C3 10F 6 Figure 8: AAT3673-1/-2/-4/-5 Evaluation Board Schematic. 5V U1 D1 Green LED +5V 4 TDFN44-16 STAT1 OUT OUT 15 R5 1.5K C5 10F J1 3 2 1 J2 3 2 1 J3 3 2 1 J4 3 2 1 7 EN1 EN1 5 BAT 11 BAT 10 EN2 BAT BYP AAT3673-3/-6 EN2 9 ENBAT TS 14 CT 16 C2 10F R6 10K TS ENBAT 8 ENO BYP ENO 2 ADP R3 ADP CHRADP 1 13 C1 10F ADPSET R4 BYP TERM GND R1 R2 12 6 C4 0.1F R7 10K 3 C3 10F Figure 9: AAT3673-3/-6 Evaluation Board Schematic. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 25 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Component Part Number Description Manufacturer U1 R1 R2 R5, R6 R7, R8 C4 C1, C2, C3, C5 J1, J2, J3 D1 D2 AAT3673-1/-2/-4/-5IXN Chip Resistor Chip Resistor Chip Resistor Chip Resistor GRM188R61A225KE34 GRM21BR71A106KE51L PRPN401PAEN LTST-C190GKT LTST-C190CKT 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN4x4-16 Package 57.6k, 1%, 1/4W; 0603 71.5k, 5%, 1/4W; 0603 1.5k, 5%, 1/4W; 0603 10k, 5%, 1/4W; 0603 0.1F 10V 10% X5R 0603 10F 10V 10% X7R 0805 Conn. Header, 2mm zip Green LED; 0603 Red LED; 0603 Skyworks Vishay Sullins Electronics Lite-On Inc. Table 9: AAT3673-1/-2/-4/-5 Evaluation Board Bill of Materials (BOM). Component Part Number Description Manufacturer U1 R1 R2 R5 R6, R7 C4 C1, C2, C3, C5 J1, J2, J3, J4 D1 AAT3673-3/-6IXN Chip Resistor Chip Resistor Chip Resistor Chip Resistor GRM188R61A225KE34 GRM21BR71A106KE51L PRPN401PAEN LTST-C190GKT 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN4x4-16 Package 57.6k, 1%, 1/4W; 0603 71.5k, 5%, 1/4W; 0603 1.5k, 5%, 1/4W; 0603 10k, 5%, 1/4W; 0603 0.1F 10V 10% X5R 0603 10F 10V 10% X7R 0805 Conn. Header, 2mm zip Green LED; 0603 Skyworks Vishay Murata Sullins Electronics Lite-On Inc. Table 10: AAT3673-3/-6 Evaluation Board Bill of Materials (BOM). Product Constant Voltage Regulation (V) OVP Trip Point (V) OVP Turn On Delay Time (s) Preconditioning Voltage Threshold (V) AAT3673-1 AAT3673-2 AAT3673-3 AAT3673-4 AAT3673-5 AAT3673-6 4.2 4.2 4.2 4.2 4.2 4.2 6.75 6.75 6.75 6.75 6.75 6.75 130 130 130 80,000 80,000 80,000 2.9 2.9 2.9 2.9 2.9 2.9 Number of Status Pins Number of Enable Pins 2; 2; 1; 2; 2; 1; 1; 1; 2; 1; 1; 2; see see see see see see Table Table Table Table Table Table 6 7 8 6 7 8 Table 11: AAT3673 Options. 26 Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 see see see see see see Table Table Table Table Table Table 1 1 2 1 1 2 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Ordering Information Package Marking1 Part Number (Tape and Reel)2 TDFN44-16 TDFN44-16 TDFN44-16 TDFN44-16 TDFN44-16 TDFN44-16 9SXYY 9XXYY 8SXYY AAT3673IXN-4.2-1-T1 AAT3673IXN-4.2-2-T1 AAT3673IXN-4.2-3-T1 AAT3673IXN-4.2-4-T1 AAT3673IXN-4.2-5-T1 AAT3673IXN-4.2-6-T1 Skyworks GreenTM products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of GreenTM, document number SQ04-0074. Packaging Information TDFN44-163 3.30 0.05 Detail "B" 4.00 0.05 Index Area (D/2 x E/2) 0.3 0.10 0.375 0.125 0.16 0.075 0.075 0.1 REF 4.00 0.05 2.60 0.05 Top View Pin 1 Indicator (optional) 0.23 0.05 Bottom View 0.45 0.05 Detail "A" 0.229 0.051 + 0.05 0.8 -0.20 7.5 7.5 0.05 0.05 Detail "B" Option A: C0.30 (4x) max Chamfered corner Option B: R0.30 (4x) max Round corner Side View Detail "A" 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 27 DATA SHEET AAT3673 1.6A Dynamic Battery Charger and Power Manager Copyright (c) 2012 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. ("Skyworks") products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. 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Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. 28 Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201881B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 25, 2012 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Skyworks: AAT3673IXN-4.2-1-T1