PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC General Description Features The AAT3672 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. * 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 * 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 * 14-pin 3x3mm TDFN Package The AAT3672 provides charging current and system power management from a single input that may be supplied by an AC adapter or USB port power source. 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 AAT3672 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 AAT3672 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 AAT3672-1/-2 has two status monitor output pins (STAT1 and STAT2), and the AAT3672-3 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 AAT3672 is available in a Pb-free, thermally enhanced, space-saving 14-pin 3x3mm TDFN package. Typical Application System Load System Load Adapter Input BAT+ STAT2 ADP CADP 10F CADP 10F CBAT 10F ADP BAT + ADP BAT Adapter Input 10k EN2 Enable Input to Output TS ENO Enable Battery to Out CHR Threshold Battery Pack TS ENO Enable Battery to Out CHR Threshold ENBAT CHRADP ADPSET Battery Pack CHRADP ADPSET CT CT TERM TERM 3672.2009.06.1.3 Temp Temp Enable Input to Output RTERM CBAT 10F ADP EN1 EN RADP AAT3672-3 Enable 2 10k ENBAT BAT Enable 1 AAT3672-1/-2 Enable OUT STAT1 OUT STAT1 GND CT RADP www.analogictech.com RTERM GND CT 1 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Pin Descriptions Pin # Name Type 1 ADPSET I 2 ADP I 3 STAT1 O 4 GND I/O STAT2 O EN2 I EN I EN1 I 7 ENO I 8 ENBAT I 9 CHRADP I 10 TERM I 11 TS I 12 BAT I/O 13 OUT O 14 CT I EP EP I/O 5 6 2 Function Connect a resistor from this pin to GND 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. 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 ADP. Common ground connection. AAT3672-1/-2: 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 ADP. AAT3672-3: The EN2 pin (internal pull-down) is used together with the EN1 pin; see Table 2 in the "Functional Description" section of this datasheet. AAT3672-1/-2: Input enable (internal pull-down). High to enable the ADP switch and battery charging path; low or floating to disable the ADP switch and battery charging function. See Table 1 in the "Functional Description" section of this datasheet. AAT3672-3: This EN1 pin (internal pull-down) 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 high input (internal pull down). Battery load switch enable, active high. Battery load switch control the power path between the battery cell and OUT (internal pull down). 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 a logic high level. Battery temperature sensing input. For typical applications, connect a 10k resistor from ADP 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 with a 10k resistor between this pin and GND. Battery pack (+) connection. For best operation, a 1F (minimum) ceramic capacitor should be placed as close as possible between BAT and GND. System dynamic power output supplied from the ADP input, BAT or both. Connect a 10F capacitor between this pin and GND for best system stability. If the system load circuit contains a reasonable bulk capacitance, the output capacitor value may be reduced. 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 as closely to the device as possible. www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Pin Configuration TDFN33-14 (Top View) AAT3672-1/2 ADPSET ADP STAT1 GND STAT2 EN ENO 1 14 2 13 3 4 12 EP 11 5 10 6 9 7 8 AAT3672-3 CT OUT BAT TS TERM CHRADP ENBAT ADPSET ADP STAT1 GND EN2 EN1 ENO 1 14 2 13 3 4 12 EP 11 5 10 6 9 7 8 CT OUT BAT TS TERM CHRADP ENBAT Absolute Maximum Ratings Symbol VP VN TJ TLEAD TOP Description ADP, BAT, OUT <30ms, Duty Cycle < 10% EN/EN1, ENO, ENBAT, STAT1, STAT2/EN2 TS, CT, ADPSET, TERM, CHRADP Junction Temperature Range Maximum Soldering Temperature (at Leads) Operating Temperature Range Value Units -0.3 to 7.5 -0.3 to 7.5 -0.3 to VP + 0.3 -40 to 150 300 -25 to 85 V V V C C C Value Units 50 2.0 C/W W Thermal Information1, 2 Symbol JA PD Description Maximum Thermal Resistance Maximum Power Dissipation 1. Mounted on 1.6mm thick FR4 circuit board. 2. Derate 50mW/C above 25C ambient temperature. 3672.2009.06.1.3 www.analogictech.com 3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Electrical Characteristics1 VADP = 5V, TA = -25C to +85C; unless otherwise noted, typical values are TA = 25C. Symbol Description Conditions Operation VADP AC Adapter Operating Voltage Range VBAT Battery Operating Voltage Range VUVLO_ADP ADP Under-Voltage Lockout VUVLO_BAT BAT Under-Voltage Lockout IADP_OP IADP_SHDN ADP Normal Operating Current Battery Operating Current IBAT_SLP Battery Sleep Current Leakage Current from BAT Pin IBAT_SHDN Power Switches RDS(ON)_SWA ADP-to-OUT FET On Resistance RDS(ON)_SWB BAT-to-OUT FET On Resistance RDS(ON)_CHA ADP Battery Charging FET On Resistance Battery Charge Voltage Regulation VCO(REG) Output Charge Voltage Regulation VMIN Preconditioning Voltage Threshold VRCH VCHR_TH Typ 4.0 3.0 ADP Shutdown Mode Current IBAT_OP Min Rising Edge Hysteresis Rising Edge Hysteresis VADP = VEN = 5V, ICC = 1A VADP = 5V, VEN = 0V, VENBAT = 0V, No Load VBAT = VCO(REG), VADP = GND, VUSB = GND, VENBAT = 5V, No Load VBAT = VCO(REG), VADP = 5V, VEN = VENBAT = 5V VBAT = VCO(REG), VENBAT = 0V VADP = 5.0V VBAT = 4.1V VADP = 5.0V VCHR_REG CHRADP and CHRUSB Pin Voltage Accuracy Current Regulation ILIM_ADP ADP Current Limit (Fixed) ILIM_BAT BAT_OUT Current Limit (Fixed) ADP Charge Constant Current Charge ICH_CC_ADP Range ICH_CC/ Constant Current Charge Current ICH_CC Regulation Tolerance 6.5 VCO(REG) 3.9 V V 3.0 CHRADP Open; Reduce Charge Current When ADP is Below VCHR_TH mA A 60 120 A 4 10 A 1 A 600 m m m 4.242 3.0 VCO(REG) - 0.05 V V 4.20 2.9 VCO(REG) - 0.1 2.0 V V 2.1 1.6 2.3 ICH_CC_ADP = 1A V 1 4.5 1.9 V 1 V A A 100 1600 mA -12 12 % ADP Charge Trickle Charge 10 ADPSET Pin Voltage Regulation TERM Pin Voltage Regulation Constant Current Charge Current Set KI_CC_ADP Factor: ICH_CC_ADP/IADPSET Termination Current Set Factor: KI_TERM ICH_TERM/ITERM AAT3672-3 Only USB Low Level Charge Current (Fixed) ICH_LO ICH_HI USB High Level Charge Current (Fixed) 2 2 ICH_TKL_ADP Units 80 600 4.158 2.8 VCO(REG) - 0.17 Battery Recharge Voltage Threshold Default ADP Charge Reduction Threshold 2.8 3.4 0.1 2.9 0.1 0.5 Max VADPSET VTERM % ICH_CC_ADP V V 29300 2000 VEN1 = VEN2 = 0 VEN1 = 0; VEN2 = 5V 70 400 85 450 100 500 mA mA 1. The AAT3672 is guaranteed to meet performance specifications over the -25C to +85C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 4 www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Electrical Characteristics (continued)1 VADP = 5V, TA = -25C to +85C; unless otherwise noted, typical values are TA = 25C. Symbol Description Conditions Logic Control/Protection Input High Threshold VEN VEN Input Low Threshold VSTATx Output Low Voltage Fast Charge (Trickle Charge + Constant Current + TC Constant Voltage Charges Together) Timeout TTKL Trickle Charge Timeout VBOVP Battery Charge Over-Current Protection Threshold TS1 TS2 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 Typ Max Units 0.4 0.4 V V V 7 hour 1.6 STATx Pin Sinks 8mA CCT = 0.1F VCO(REG) + 0.1 Battery Over-Voltage Protection Threshold IOCP Min In All Modes TC/8 VCO(REG) + 0.2 100 28 58 Threshold Hysteresis VCO(REG) + 0.15 30 60 115 95 100 140 15 32 62 V % ICH_CC % VADP % VADP C C C C 1. The AAT3672 is guaranteed to meet performance specifications over the -25C to +85C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 3672.2009.06.1.3 www.analogictech.com 5 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Typical Characteristics 0.8 0.7 0.6 0.5 0.4 0.3 0.2 Constant Current Pre-Conditioning 0.1 0.0 10 100 1000 10000 Constant Charge Current vs. RADP Constant Charge Current (mA) Operating Current IADP_OP (mA) Adapter Supply Operating Current vs. RADP 10000 Constant Current Pre-Conditioning 1000 100 10 1 10 100 RADP (k) 1000 10000 RADP (k) Output Charge Voltage Regulation Accuracy vs. Adapter Voltage Output Charge Voltage vs. Temperature (VCO(REG) = 4.2V) 4.23 Battery Voltage (V) 0.25 Accuracy (%) 0.2 0.15 0.1 0.05 0 -0.05 -0.1 -0.15 4.22 4.21 4.2 4.19 4.18 -0.2 4.17 -25 -0.25 5 5.25 5.5 5.75 6 6.25 6.5 -15 -5 5 Battery Sleep Current vs. Temperature 35 45 55 65 75 85 Operating Current vs. Temperature 5 0.7 0.65 4.5 0.6 4 IOP (mA) Battery Sleep Current (A) 25 Temperature (C) VADP (V) 3.5 3 0.55 0.5 0.45 0.4 2.5 2 -25 0.35 -15 -5 5 15 25 35 45 55 65 75 85 0.3 -25 Temperature (C) 6 15 -15 -5 5 15 25 35 45 55 65 75 85 Temperature (C) www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Typical Characteristics Recharge Threshold Voltage vs. Temperature (VADP = 5V; RADP = 56.7k) 1.1 4.16 1.05 Battery Voltage (V) Constant Charging Current (A) Constant Charging Current vs. Adapter Voltage 1 0.95 0.9 0.85 0.8 VBAT = 3.6V VBAT = 3.9V VBAT = 4.1V 0.75 0.7 4 4.5 5 5.5 6 4.14 4.12 4.1 4.08 4.06 4.04 -25 6.5 -15 -5 5 Constant Charge Current vs. Temperature 35 45 55 65 75 85 Charging Current vs. Battery Voltage 1100 1200 1000 900 Chargin Current (mA) Constant Charge Current (mA) 25 Temperature (C) VADP (V) 1A 425mA 85mA 800 700 600 500 400 300 200 100 -15 -5 5 15 25 35 45 55 65 75 800 600 400 200 0 2.5 0 -25 1A 425mA 85mA 1000 85 2.9 3.3 Temperature (C) 3.7 4.1 4.5 Battery Voltage (V) Preconditioning Voltage Threshold vs. Adapter Voltage Preconditioning Voltage Threshold vs. Temperature 3 3 2.98 2.98 2.96 2.96 2.94 VMIN (V) 2.94 VMIN (V) 15 2.92 2.9 2.88 2.92 2.9 2.88 2.86 2.86 2.84 2.84 2.82 2.82 2.8 5 5.25 5.5 5.75 6 6.25 6.5 2.8 -25 -5 5 15 25 35 45 55 65 75 85 Temperature (C) VADP (V) 3672.2009.06.1.3 -15 www.analogictech.com 7 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Typical Characteristics Adapter and Charging Current vs. Output Current Adapter and Charging Current vs. Output Current (VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V; AAT3672-3 VEN1 = VEN2 = 0V) (VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V) 1.8 Adapter Current (A) Adapter Current (A) 2 1.8 1.6 1.4 1.2 1 0.8 0.6 IADP IBAT 0.4 0.2 IADP IBAT 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 0 0.2 0.4 0.6 Output Current (A) IADP IBAT Capacitance (F) Current (A) 1.6 1.8 Full Charge Trickle Charge 0.9 1.4 1.2 1 0.8 0.6 0.4 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.2 0 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 0 Output Current (A) 1 2 3 4 6 7 (500mA Charging Setting) 1A 0 1A 0 ADP Voltage (top) (V) 4.5 5 4.5 Time 4 500mA 0 500mA 0 ADP Charge Current (middle) ADP Peripheral Current (bottom) (0.5A/div) ADP Charge Current (1A Charging Setting) ADP Charge Current (middle) ADP Peripheral Current (bottom) (0.5A/div) ADP Charge Current 4 5 Time (hours) 5 ADP Voltage (top) (V) 1.4 1 2 8 1.2 CT Pin Capacitance vs. Counter Timeout (VADP = 5V; VBAT = 3.6V; VENO = VENBAT = 5V; AAT3672-3 VEN1 = 0V; VEN2 = 5V) 1.6 1 Output Current (A) Adapter and Charging Current vs. Output Current 1.8 0.8 Time www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Typical Characteristics (VADP = 5V 0V; VBAT = 3.6V; VENBAT = 5V; VENO = 5V; RLOAD = 50) 7 6 5 4 3 2 VADP VBAT VOUT 1 0 -1 VADP, VBAT, VOUT Voltage (V) Response of Out when Switching from VADP to VBAT (VADP = 0V 5V; VBAT = 3.6V; RLOAD = 50) VADP, VBAT, VOUT Voltage (V) Response of Out when Switching from VBAT to VADP 7 VADP VBAT VOUT 6 5 4 3 2 1 0 -1 Time (200s/div) Time (200s/div) 7 6 5 4 3 2 VADP VBAT VOUT 1 0 -1 VADP, VBAT, VOUT Voltage (V) Response of Out when Switching from VADP to VBAT (VADP = 5V 0V; VBAT = 3.6V; VENBAT = 0V; VENO = 5V; RLOAD = 50) VADP, VBAT, VOUT Voltage (V) Response of Out when Switching from VBAT to VADP (VADP = 0V 5V; VBAT = 3.6V; VENBAT = 0V; VENO = 5V; RLOAD = 50) 7 5 4 3 2 1 0 -1 Time (200s/div) Time (200s/div) Response of Out when VENO = 0V Response of Out when VENO = 0V (VADP = 0V 5V; VBAT = 3.6V; VENBAT = 5V; RLOAD = 50) (VADP = 5V 0V; VBAT = 3.6V; VENBAT = 5V; RLOAD = 50) 7 6 5 4 3 2 1 VADP VBAT VOUT 0 -1 VADP, VBAT, VOUT Voltage (V) VADP, VBAT, VOUT Voltage (V) VADP VBAT VOUT 6 7 5 4 3 2 1 0 -1 Time (200s/div) 3672.2009.06.1.3 VADP VBAT VOUT 6 Time (200s/div) www.analogictech.com 9 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Response of Out when VENBAT = 0V Response of Out when VENBAT = 0V (VBAT = 0V 3.6V; VADP = 5V; VENO = 5V; RLOAD = 50) (VBAT = 3.6V 0V; VADP = 5V; VENO = 5V; RLOAD = 50) 7 VADP, VBAT, VOUT Voltage (V) VADP, VBAT, VOUT Voltage (V) Typical Characteristics 6 5 4 3 2 1 VADP VBAT VOUT 0 -1 7 6 5 4 3 2 VADP VBAT VOUT 1 0 -1 Time (200s/div) Time (200s/div) Response of Out when Removing Battery (VBAT = 3.6V 0V; VADP = 5V; VENBAT = 5V; VENO = 0V; RLOAD = 50) 7 VADP, VBAT, VOUT Voltage (V) VADP, VBAT, VOUT Voltage (V) Response of Out when Inserting Battery (VBAT = 0V 3.6V; VADP = 5V; VENBAT = 5V; VENO = 0V; RLOAD = 50) 6 5 4 3 2 1 VADP VBAT VOUT 0 -1 7 6 5 4 3 2 1 VADP VBAT VOUT 0 -1 Time (200s/div) Time (200s/div) 1.6 -25C 25C 85C 1.4 1.2 1 0.8 0.6 0.4 5 5.25 5.5 5.75 6 6.25 6.5 Input Low Threshold vs. Adapter Voltage VENBAT(L); VEN1(L); VEN2(L); VENO(L) (V) VENBAT(H); VEN1(H); VEN2(H); VENO(H) (V) Input High Threshold vs. Adapter Voltage 1.6 1.2 1 0.8 0.6 0.4 VADP (V) 10 -25C 25C 85C 1.4 5 5.25 5.5 5.75 6 6.25 6.5 VADP (V) www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC 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 85 Temperature (C) 3672.2009.06.1.3 61 60.5 60 59.5 59 58.5 58 -25 -15 -5 5 15 25 35 45 55 65 75 85 Temperature (C) www.analogictech.com 11 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Functional Block Diagram ADP to OUT Switch OUT ADP to BAT Sw itch EN/EN1 ENO ENBAT BAT to OUT Switch ADP BAT CT TERM Charge System Control TS Voltage Sense ADPSET CHRADP STAT1 Thermal and Current Sense STAT2/EN2 Functional Description The AAT3672 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 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. When an input power source is applied to the AAT3672, 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 12 Ref. GND 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 AAT3672 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 AAT3672 pre-conditions (trickle charge) 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. 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 www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC charge the battery cell with the maximum amount of current possible. The AAT3672 has a unique internal charge current reduction loop control 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 AAT3672 exceeds the ability of a given USB port. In either case, the AAT3672 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 fault condition. 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 AAT3672 utilizes a digitally controlled thermal loop system that will reduce the charging current to prevent the device from 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. 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, overcurrent, 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 AAT3672 also provides a temperature sense feedback 3672.2009.06.1.3 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 AAT3672 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 AAT3672 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 AAT3672 checks the state of the battery by sensing the cell voltage. If the cell voltage is below the preconditioning voltage threshold (VMIN), the AAT3672 begins preconditioning the battery cell. 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 AAT3672 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 AAT3672 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 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). www.analogictech.com 13 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Control Inputs Pass Devices EN ENO ENBAT ADP - OUT ADP - BAT BAT - OUT 0 1 0 1 0 1 0 1 0 0 1 1 0 0 1 1 0 0 0 0 1 1 1 1 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: AAT3672-1 and AAT3672-2 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 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 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: AAT3672-3 Battery and Adapter Dynamic Path Control Table 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. 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. The formulas for Charge Termination Current are similar to those for Fast Charge Current: 2V ICH_TERM = KI_TERM * R TERM End of Charge Cycle Termination and Recharge Sequence or 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, KI_TERM = 2000 (typical) 14 www.analogictech.com 2V RTERM = KI_TERM * I CH_TERM 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Preconditioning Trickle Charge Phase Constant Current Charge Phase Constant Voltage Charge Phase End of Charge Voltage Regulated Current Constant Current Mode Voltage Threshold (4.2V) I = Max CC (2.9V) Trickle Charge Charge Termination Current Figure 1: Current vs. Voltage and Charger Time Profile. When the input supply is disconnected, the charger also automatically enters power-saving sleep mode. Only consuming less than 1A in sleep mode, the AAT3672 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 AAT3672 input voltage drops, the device will enter the sleep mode and automatically resume charging once the input supply has recovered from its fault condition. VIN IN AAT3672 0.60 x VIN Battery Cold Fault TS Battery Pack Battery Hot Fault x V IN Current Regulation The ADP current limit (ILIM_ADP) = BAT_OUT current (ILIM_BAT) + ADP fast charge (CC) current (ICH_CC). For example: if ADP fast charge current is set to 0.6A , then the BAT_OUT current is 1A. If the BAT_OUT current increases to 1.2A, then the ADP fast charge current is reduced to 0.4A because ADP current limit is 1.6A. However, the 1.6A number is the minimum value for the current limit, not the typical value. Temperature Sense (TS) Inside the AAT3672, the internal battery temperature sensing system 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 = 0.30 * VADP and the TS2 threshold = 0.60 * VADP. If the use of the TS pin function is not required by the system, it should be terminated to ground using a 10k resistor. 3672.2009.06.1.3 Figure 2: AAT3672 Battery Temperature Sense Circuit. Charge Safety Timer (CT) While monitoring the charge cycle, the AAT3672 utilizes a charge safety 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 AAT3672 charges the cell at 10% of the programmed maximum charge until VBAT >2.9V. If the cell voltage fails to the precondition 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: about 50 minutes for Trickle Charge mode, 6 hours for Constant Current Mode and Constant Voltage mode together. www.analogictech.com 15 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC The timeout is 7 hours (typical) for a 100nF capacitor. Timeout is directly proportional to capacitor value, so for a 200nF capacitor it would be 14 hours, and for a 50nF capacitor it would be 3.5 hours. For a given target delay time TD (in hours) calculate: CT = (TD * 100nF) 7 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 periods would be doubled. If the programmable watchdog 16 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. www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC System Operation Flowchart 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 Yes Reduce Charging Current to BAT Yes Preconditioning Test VMIN > VBAT IOUT + IBAT > ILIM? 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 IBAT > ITERM No Yes Charge Reduction Mode No Yes Yes 3672.2009.06.1.3 Charge Complete Voltage Regulation Enable www.analogictech.com Input Voltage Level Test VADP < VCHR_TH No 17 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Applications Information The following equation may be used to approximate the ADP charge reduction threshold above or below 4.5V: 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 4.35V to 5.5V. VCHR_TH = 2.0V (R4/[R4 + R3]) where R4 and R3 < 500k. 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 3 for recommended RADP values for a desired constant current charge level. Battery charging states will be indicated via the STAT1 and STAT2 display LEDs for the AAT3672-1 and -2, and via STAT1 for the AAT3672-3. Please refer to the Battery Charge Status Indication discussion on page 19 of this datasheet for further details. VADP ADP R3 1M CHRADP VCH_REG = 2.0 R4 800k Charge Reduction Under normal operation, the AAT3672 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 AAT3672 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. 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 a point above 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 ADP 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 ADP input pin. 18 Figure 3: Internal Equivalent Circuit for the CHRADP Pin. Adapter Input Charge Inhibit and Resume The AAT3672 has an under-voltage lockout (UVLO) and power on reset feature to protect the charger IC in the event the input supply to the adapter pin drops below the UVLO threshold. Under a UVLO condition, the charger will suspend the charging process. When power is re-applied to the adapter pin 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. Programming Fast Charge Current The constant current charge level is user programmed 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 3. www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Battery Connection (BAT) Charge current setting formula: ICH_CC_ADP (typ) = A single cell Li-Ion/Polymer battery should be connected between BAT input and ground. VADP * KII_CC_ADP RADP Battery Charge Status Indication Constant Charge Current (mA) Set Resistor Value (k) 100 200 300 400 500 800 1000 1600 665 324 215 162 127 76.8 57.6 36.5 Charge Status Indicator Outputs There are three device options. All options include recharge sequence after adapter is inserted. The AAT36721 and AAT3672-2 have two status (STAT1 and STAT2) pins and one enable pin (EN); the AAT3672-3 has one status pin (STAT1) and two enable pins (EN1 and EN2) Charge State Pre-Charge Fast-Charge End of Charge (Charge complete) Charge Disabled, Sleep Mode or Fault Condition Table 3: RADP Values. For the AAT3672-3, 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 options. No Battery (with Charge Enabled) 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 Pre-Charge or Fast-Charge End of Charge (Charge Complete, Charge Disabled, or Sleep Mode) Fault Condition No Battery (with Charge Enabled) Table 4: AAT3672-3 Operating Modes. ON OFF ON OFF OFF Flash (1Hz, 40% duty) Flash (1Hz, 40% duty) STAT1 STAT2 ON OFF OFF OFF OFF Flash (1Hz, 40% duty) ON OFF Table 6: AAT3672-2 LED Status Indicators. Figure 4 shows the relationship of constant charging current and set resistor values for the AAT3672. Constant Charge Current (mA) STAT2 ON ON OFF Table 5: AAT3672-1 LED Status Indicators. Charge State EN1 STAT1 Charge State Pre-Charge or Fast-Charge End of Charge (Charge Complete, Charge Disabled, Sleep Mode, or Fault Condition) 10000 Constant Current Pre-Conditioning No Battery (with Charge Enabled) 1000 STAT1 ON OFF Flash (1Hz, 40% duty) Table 7: AAT3672-3 LED Status Indicators. 100 Fault condition can be one of the following: 10 1 10 100 1000 10000 RADP (k) * * * * Battery over-voltage (OV) Battery temperature sense hot or cold Battery charge timer time-out Chip thermal shutdown Figure 4: Constant Charging Current vs. Set Resistor Values. 3672.2009.06.1.3 www.analogictech.com 19 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC 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 AAT3672-1/-2 and the STAT1 pin of the AAT3672-3. These pins have simple switches connecting the LED's cathodes to ground. Refer to Tables 5, 6, and 7 for LED display definitions. The LED anodes should be connected to VIN, 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 AAT3672-1/-2 and the STAT1 pin of the AAT3672-3. 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: 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 AAT3672 will always provide the highest possible level of constant current in the fast charge mode for any given ambient temperature condition. Programmable Watchdog Timer Red LED forward voltage (VF) is typically 2.0V @ 2mA. The AAT3672 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 to the trickle charge to the fast charge constant current mode and then to the constant voltage mode, the timing counter is reset and will time out after 6 hours. When connecting to the USB supply with a green LED: Summary for a 0.1F used for the timing capacitor: RB(STAT1,2) = VADP - VFLED ILED(STAT1,2) Example: RB(STAT1,2) = 5.5V - 2.0V = 1.75k 2mA RB(STAT1,2) = Trickle Charge (TC) time out = 50 minutes Fast Charge Constant Current (CC) + Constant Voltage (VC) mode time out = 6 hours VUSB - VFLED ILED(STAT1,2) Example: RB(STAT1,2) = 5.0V - 3.2V = 900 2mA Green LED forward voltage (VF) is typically 3.2V @ 2mA. Protection Circuitry Thermal Loop Control 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. The thermal management system measures the internal circuit die temperature and reduces the charge current when the device exceeds a preset internal temperature 20 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 + VC time divided by 8. If the programmable watchdog timer function is not needed it may be disabled the 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. The charge timer control will suspend the timing count in any given mode in the event a fault condition occurs. Such fault conditions include digital thermal loop charge current reduction, battery charge reduction, battery tem- www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC perature fault, 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 AAT3672 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 AAT3672 charge control will shutdown the device until voltage on the BAT pin drops below the overvoltage protection threshold (VBOVP). The AAT3672 will resume normal charging operation once the battery over-voltage condition is removed. Over-Temperature Shutdown The AAT3672 has a thermal protection control circuit which will shut down charging functions should the internal die temperature exceed the preset thermal limit threshold. Battery Temperature Fault Monitoring In the event of a battery over-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 AAT3672 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 3672.2009.06.1.3 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 AAT3672 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, ceramic capacitors in the 1.0F to 10F range are recommended or best performance. Applications utilizing the exceptionally low output noise and optimum power supply ripple rejection of the AAT3672 should use 2.2F or greater values for the system power output capacitor. Printed Circuit Board Layout Recommendations For proper thermal management and to take advantage of the low RDS(ON) of the AAT3672, 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 AAT3672 TDFN33 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. www.analogictech.com 21 PRODUCT DATASHEET AAT3672 BatteryManagerTM 22 1.6A Dynamic Battery Charger and Power Management IC Figure 4: AAT3672-1/-2 Evaluation Board Top Layer. Figure 5: AAT3672-1/-2 Evaluation Board Mid1 Layer. Figure 6: AAT3672-1/-2 Evaluation Board Mid2 Layer. Figure 7: AAT3672-1/-2 Evaluation Board Bottom Layer. www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Figure 8: AAT3672-3 Evaluation Board Top Layer. Figure 9: AAT3672-3 Evaluation Board Mid1 Layer. Figure 10: AAT3672-3 Evaluation Board Mid2 Layer. Figure 11: AAT3672-3 Evaluation Board Bottom Layer. 3672.2009.06.1.3 www.analogictech.com 23 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC 2 ADP C3 10F TDFN44-16 ADP OUT 13 OUT J1 3 2 1 J2 6 EN 7 ENO Red LED D1 D2 BAT R7 10K ENBAT R5 1.5K 1 2 3 8 ENBAT STAT1 TS R6 1.5K C1 10F R4 open 11 TS 5 STAT2 9 CHRADP TERM 10 1 ADPSET GND CT 14 R8 open C4 0.1F 4 R1 57.6K C2 10F J3 AAT3672-1/-2 3 Green LED 12 EN 3 2 1 ENO R3 open BAT CT R2 71.5K Figure 12: AAT3672-1/-2 Evaluation Board Schematic. 2 ADP C3 10F TDFN33-14 ADP OUT 13 EN1 12 OUT J1 3 2 1 6 J2 3 2 1 J3 R3 open 3 2 1 EN1 BAT 5 EN2 ENO 7 R4 open 1 2 3 8 C2 10F ENBAT TS 11 3 STAT1 9 CHRADP TERM 10 1 ADPSET GND CT 14 R1 57.6K J4 ENO D1 Green LED C1 10F R6 10K EN2 ENBAT R5 1.5K BAT AAT3672-3 4 TS R7 open CT R2 71.5K C4 0.1F Figure 13: AAT3672-3 Evaluation Board Schematic. 24 www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Component Part Number Description Manufacturer U1 R1 R2 R5, R6 R7 C4 C1, C2, C3 J1, J2, J3 D1 D2 AAT3672-1/-2IWP Chip Resistor Chip Resistor Chip Resistor Chip Resistor GRM188R61A225KE34 GRM21BR71A106KE51L PRPN401PAEN LTST-C190GKT LTST-C190CKT 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-12 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 AnalogicTech Vishay Vishay Vishay Vishay Murata Murata Sullins Electronics Lite-On Inc. Lite-On Inc. Table 8: AAT3672-1/-2 Evaluation Board Bill of Materials (BOM). Component Part Number Description Manufacturer U1 R1 R2 R5 R6 C4 C1, C2, C3 J1, J2, J3, J4 D1 AAT3672-3IWP Chip Resistor Chip Resistor Chip Resistor Chip Resistor GRM188R61A225KE34 GRM21BR71A106KE51L PRPN401PAEN LTST-C190GKT 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-12 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 AnalogicTech Vishay Vishay Vishay Vishay Murata Murata Sullins Electronics Lite-On Inc. Table 9: AAT3672-3 Evaluation Board Bill of Materials (BOM). 3672.2009.06.1.3 www.analogictech.com 25 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Ordering Information Package Marking1 Part Number (Tape and Reel)2 TDFN33-14 TDFN33-14 TDFN33-14 4RXYY 3SXYY 4QXYY AAT3672IWO-4.2-1-T1 AAT3672IWO-4.2-2-T1 AAT3672IWO-4.2-3-T1 All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/about/quality.aspx. Packaging Information TDFN33-143 Detail "A" 3.000 0.050 2.500 0.050 Index Area 3.000 0.050 1.650 0.050 Top View Bottom View + 0.100 - 0.000 Pin 1 Indicator (Optional) 0.180 0.050 Side View 0.400 BSC 0.000 0.203 REF 0.750 0.050 0.425 0.050 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. 26 www.analogictech.com 3672.2009.06.1.3 PRODUCT DATASHEET AAT3672 BatteryManagerTM 1.6A Dynamic Battery Charger and Power Management IC Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611 (c) Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech's terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. 3672.2009.06.1.3 www.analogictech.com 27