DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package General Description Features The AAT3696 BatteryManagerTM is a single-cell lithiumion (Li-Ion)/Li-Polymer battery charger IC designed to operate from USB ports or AC adapter up to an input voltage of 6.5V or 6.05V (depending on the option1). For increased safety, the AAT3696 also includes over-voltage input protection (OVP) up to 28V. * * * * * The AAT3696 precisely regulates battery voltage after it has reached 4.2V or 4.375V (depending on the option1) Li-Ion/Polymer battery cells through an extremely low RDS(ON) switch. The charging current can be set by an external resistor up to 1.6A. In case an over-voltage condition occurs from the input, a series switch quickly opens and a fault flag is activated to prevent damage to the battery and charging circuitry. Other fault conditions are monitored in real time. In case of an over-current, battery over-voltage, short circuit, or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. A status monitoring output pin (STAT) is provided to indicate charging activity. This open-drain output pin can be used to drive an external LED as a charging indicator. The AAT3696 has two charge termination mode selections when the battery voltage has reached the constant voltage level VCO(REG) and the charging current has decreased the termination current level. The AAT3696 offers a 4.9V/30mA LDO linear regulator. This regulator is enabled all the time regardless of the status of the charger and protected by the OVP switch. The AAT3696 is available in the Pb-free, thermally enhanced, space-saving 3x3mm TDFN33-12 package and is rated over the -40C to +85C temperature range. * * * * * * * * * * * * USB or AC Adapter System Power Charger 3.0V ~ 6.5V or 6.05V Input Voltage Range 2.8V Typical Under-Voltage Lockout Threshold Fast Over-Voltage Protection Turn Off Two OVP Turn-On Delay Time Options: 40s 80ms Two OVP Trip Point Options: Protection Trip at 6.75V Protection Trip at 6.25V High Level of Integration with Internal: Power Device Reverse Current Blocking Current Sensing 4.9V/30mA LDO Output Through Over-Voltage Protection Device Programmable Current from 100mA to 1.6A Max Charge Status Indicator Automatic Recharge Sequencing Automatic Trickle Charge For Battery Pre-Conditioning Emergency Thermal Shutdown Protection Power on Reset and Soft Start Active Low Enable with Internal 200k Pull-Down Resistor Two Charge Termination Control Selections: Manual: Continuous Battery Charging Until Charge Termination by Enable Pin Automatic: Battery Charging is Terminated with Transition to Sleep State 12-pin 3x3mm TDFN Package Applications * * * * * BluetoothTM Headsets, Headphones, Accessories Digital Still Cameras Mobile Telephones MP3 Players Personal Data Assistants (PDAs) 1. Please refer to Table 9 on page 19 for complete list of options. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 1 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Typical Application IN VADP BATT+ 1F OVPFLG BAT BATS OVPFLG IC INCHR 10F BATT- INCHR 2.2F Battery Pack AAT3696 STAT LDOOUT LDOOUT 2.2F EN ON/OFF 10k MODE GND System ISET RSET Pin Descriptions Pin # Name Type 1 INCHR I/O 2 3 4 5 IN LDOOUT OVPFLG STAT I O O O 6 MODE I 7 8 9 10 11 12 GND EN ISET IC BATS BAT I/O I I I I O EP Function Output of over-voltage protection (OVP) stage and input to battery charger. Decouple to GND with 2.2F capacitor. Input from USB port or AC adapter. 4.9V/30mA LDO output through OVP device. Bypass to GND with 2.2F capacitor. Over-voltage fault flag, open drain, active low. Charge status indicator pin, open drain, active low. MODE selection pin (internal connect with a 200k pull-up resistor to INCHR). Factory default at 10% termination current if MODE is open or connect to INCHR. Continues to charge if MODE is connect to GND. Power ground. Active low enable pin (internal connect with a 200k pull-down resistor). Connect RSET resistor here to set adaptor or USB charging current. Internally connected through 100k resistor to GND. Leave this pin open. Battery voltage remote sense input. Connect to Li-Ion battery. Exposed paddle (bottom); The exposed thermal pad (EP) should be connected to board ground plane and pin 7. The ground plane should include a large exposed copper pad under the package for thermal dissipation (see package outline). Pin Configuration TDFN33-12 (Top View) INCHR IN LDOOUT OVPFLG STAT MODE 2 1 12 2 11 3 10 4 9 5 8 6 7 BAT BATS IC ISET EN GND Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Absolute Maximum Ratings1 Symbol VIN VP VN TJ TA TLEAD Description IN continuous INCHR, EN, STAT, OVPFLG, MODE BAT, BATS, LDOOUT, ISET, IC Junction Temperature Range Operating Temperature Range Maximum Soldering Temperature (at Leads) Value Units -0.3 to 30 -0.3 to 7.5 -0.3 to VP + 0.3 -40 to 150 -40 to 85 300 V V V C C C Value Units 50 2 C/W W Thermal Information2 Symbol JA PD Description Maximum Thermal Resistance (TDFN33-12) Maximum Power Dissipation 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on an FR4 board. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 3 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Electrical Characteristics1 VIN = 5V, TA = -40 to +85C, RSET = 3.16k, VMODE = 0V, BAT = BATS, unless otherwise noted. Typical values are at TA = 25C Symbol Description Conditions Min Typ Max Units V 0.5 28 6.5 6.05 0.6 mA 160 220 A 0 1 A 6.75 6.25 100 7.0 6.45 V Operation Input Over-Voltage Protection Range VIN_MAX VIN Normal Operating Input Voltage Range 2, 3 Operating Current Charge Function Shutdown Supply ISD Current (OVP function still active) Leakage Current from BAT Pin IBAT Over-Voltage Protection IOP VOVPT Over-Voltage Protection Trip Point2, 3 Hysteresis Dropout Voltage between IN and INCHR VDO_OVP Pins Battery Charger Under-Voltage Lockout Threshold VUVLO UVLO Hysteresis Dropout Voltage between INCHR and BAT VDO_CHARGE Pins VBOVP Battery Over-Voltage Protection Threshold Voltage Regulation VCO (REG) Constant Output Voltage2, 3 Refer to Table 4 Refer to Table 4 RSET = 15.8 k, VEN = 0V, VIN = 5V 3.0 3.0 VIN =VEN = 5.5V VBAT = 4V, IN Pin Open VIN Rising Edge; Refer to Table 4 VIN Rising Edge; Refer to Table 4 6.5 6.05 VIN = 5V, ILOAD@BAT = 1000mA, RSET = 1k VIN Rising edge VIN = 4.2V, ILOAD@BAT = 1000mA, RSET = 1k Refer to Table 4 Refer to Table 4 TA = 25C TA = -40C to +85C VCO/VCO Constant Output Voltage Tolerance VRCH Battery Recharge Voltage Threshold MODE = High VMIN Preconditioning Voltage Threshold2, 3 Refer to Table 4 Refer to Table 4 Current Regulation Charge Current Programmable Range ICC_RANGE ICH_CC Constant-Current Mode Charge Current VISET ISET Pin Voltage KIISET Charge Current Set Factor: ICH_CC/IISET RSET = 15.8k, VBAT = 3.6V RSET = 3.16k, VBAT = 3.6V RSET = 1.58k, VBAT = 3.6V RSET = 1k, VBAT = 3.6V TA = 25C TA = -40C to +85C VBAT = 3.6V ICH_TRK Trickle Charge Current VBAT = 2.3V ICH_TERM Charge Termination Threshold Current mV 200 2.5 2.8 150 100 -15% -10% -10% -15% 1.98 1.9 mV 3.0 V mV 200 mV 4.4 V 4.20 4.375 V -0.5 -1 2.4 2 V +0.5 +1 VCO(REG) - 0.1 2.6 2.2 110 500 1000 1500 2 2 790 % % V 2.8 2.4 1600 +15% +10% +10% +15% 2.02 2.1 12 10 V mA mA mA mA mA V % ICH_CC % ICH_CC 1. The AAT3696 is guaranteed to meet performance specifications over the -40C to +85C operating temperature range and is assured by design, characterization and correlation with statistical process controls. 2. Only options -1, -2, -5, and -6 are available. 3. Please refer to Table 9 on page 19 for complete list of options. 4 Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Electrical Characteristics1 VIN = 5V, TA = -40 to +85C, RISET = 3.16k, VMODE = 0V, BAT = BATS, unless otherwise noted. Typical values are at TA = 25C Symbol Description Logic Control / Battery Protection VEN(H), VMODE(H) Input High Threshold VEN(L), VMODE(L) Input Low Threshold VSTAT Output Low Voltage ISTAT STAT Pin Current Sink Capability VOVPFLG Output Low Voltage IOVPFLG OVPFLG Pin Current Sink Capability OVPFLG Assertion Delay Time from OverTDLY_OVPFLG Voltage TRESPOV Over-Voltage Protection Response Time TOVPR OVP Switch Turn-On Rise Time TSHDN Chip Thermal Shutdown Temperature Conditions VIN = 5V Min Typ Max Units 0.4 0.4 8 0.4 8 V V V mA V mA 1.2 STAT pin sinks 4mA OVPFLG pin sinks 4mA From assertion of over-voltage condition (OV) VIN voltage step up from 6V to 8V, RLOAD = 100, CINCHR = 1F RLOAD = 100, CINCHR = 1F Threshold Hysteresis 1 s 0.5 s 100 140 15 s C Options -1, -3, -5, -7, -9, -11, -13, -15 TRELDLY_OVPFLG_40s TOVPON_40s OVPFLG Release Delay Time OVP Switch OVP Release Delay Time TOVPSTARTON_40s OVP Switch Start Up Delay Time From release of over-voltage condition (OV) VIN voltage step down from 8V to 6V, RLOAD = 100, CINCHR = 1F VIN voltage step up from 0V to 5V, RLOAD = 100, CINCHR = 1F 1.5 s 40 s 150 250 s Options -2, -4, -6, -8 , -10, -12, -14, -16 TRELDLY_OVPFLG_80ms TOVPON_80ms OVPFLG Release Delay Time OVP Switch OVP Release Delay Time TOVPSTARTON_80ms OVP Switch Start Up Delay Time From release of over-voltage condition (OV) VIN voltage step down from 8V to 6V, RLOAD = 100, CINCHR = 1F VIN voltage step up from 0V to 5V, RLOAD = 100, CINCHR = 1F 80 ms 80 ms 80 ms Low Dropout Regulator (LDO) VOUT LDO Output Voltage Tolerance VDO ILIM LDO Dropout Voltage LDO Current Limit VOUT/VOUT*VIN LDO Line Regulation VOUT(Line) LDO Dynamic Line Regulation VOUT(Load) LDO Dynamic Load Regulation TA = 25C TA = -40C to 85C VIN = 5V, ILDOOUT = 50mA ILDOOUT = 30mA, VIN =4.9V VOUT = 0V VIN = 5V to 6V or 5.4V to 6.4V, ILDOOUT = 10mA ILDOOUT = 30mA, VIN = 5V to 6V or 5.4V to 6.4V, TR/TF = 2s ILDOOUT = 1mA to 30mA, TR <5s; VIN = VOUT(NOM) +1V ILDOOUT = 1mA to 30mA, VIN = 5.1V 4.802 4.9 4.998 4.729 4.9 5.071 V 200 75 300 mV mA 0.09 %/V 4.4 25 mV 60 mV 1. The AAT3696 is guaranteed to meet performance specifications over the -40C to +85C operating temperature range and is assured by design, characterization and correlation with statistical process controls. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 5 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Constant Charging Current vs. Set Resistor Values Operating Current vs. Set Resistor Values 2400 10000 Operating Current (A) Constant Charging Current (mA) Typical Characteristics-Battery Charger 1000 100 10 1 0.1 1 10 Constant Current Mode Preconditioning Mode 2100 1800 1500 1200 900 600 300 0 0.1 100 1 10 RSET (K ) 100 RSET (K ) Constant Charging Current vs. Battery Voltage Constant Charging Current vs. Temperature RSET = 1.58K RSET = 1.96K 1000 RSET = 2.67K RSET = 3.92K Constant Charging Current (mA) Constant Charging Current (mA) (RSET = 1.58K) 1200 RSET = 7.87K 800 600 400 200 0 2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 1010 1006 1002 998 994 990 -40 -15 Constant Charging Current vs. Input Voltage 950 900 850 VBAT = 3.3V VBAT = 3.6V VBAT = 3.9V VBAT = 4.1V 4.5 5.0 5.5 Input Voltage (V) 6 6.0 6.5 Constant Charging Current (mA) Constant Charging Current (mA) 1000 700 4.0 60 85 (RSET = 3.16K) 1050 750 35 Constant Charging Current vs. Input Voltage (RSET =1.58K) 800 10 Temperature (C) Battery Voltage (V) 580 560 540 520 500 480 460 VBAT = 3.3V VBAT = 3.6V VBAT = 3.9V VBAT = 4.1V 440 420 400 4.0 4.5 5.0 5.5 6.0 Input Voltage (V) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 6.5 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Typical Characteristics-Battery Charger Preconditioning Voltage Threshold vs. Temperature Preconditioning Charge Current vs. Temperature (RSET = 1.58K; ICH_CC = 1000mA) Preconditioning Charge Current (mA) Preconditioning Voltage Threshold (V) (RSET = 1.58K) 2.63 2.62 2.61 2.60 2.59 2.58 2.57 2.56 2.55 -40 -15 10 35 60 120 115 110 105 100 95 90 85 80 -40 85 -15 Temperature (C) Constant Output Voltage vs. Temperature Constant Output Voltage V) Constant Output Voltage (V) 4.215 4.210 4.205 4.200 4.195 4.190 4.185 10 35 60 85 4.208 4.206 4.204 4.202 4.200 4.198 4.196 4.194 4.192 4.190 5.0 5.3 5.6 5.9 6.2 6.5 Input Voltage (V) Enable Input Low Voltage vs. Input Voltage Enable Input High Voltage vs. Input Voltage 0.900 0.81 0.78 0.75 0.72 0.69 0.66 85C 25C -40C 0.63 4.5 5.0 5.5 Input Voltage (V) 6.0 6.5 Enable High Voltage (V) 0.84 Enable Low Voltage (V) 85 4.210 Temperature (C) 0.60 4.0 60 (RSET =1.58K) 4.220 -15 35 Constant Output Voltage vs. Input Voltage (RSET = 1.58K) 4.180 -40 10 Temperature (C) 0.899 0.898 0.897 0.896 0.895 0.894 0.893 85C 25C -40C 0.892 0.891 0.890 4.0 4.5 5.0 5.5 6.0 6.5 Input Voltage (V) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 7 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Typical Characteristics-OVP OVPFLG Assertion Delay Time OVPFLG Assertion Delay Time (RLOAD = 100, OVP Trip Point 6.75V) (RLOAD = 100, OVP Trip Point 6.25V) 8 8 7 4 3 2 Input Voltage (top) (V) 5 6 5 4 3 2 1 1 0 0 Time (1s/div) OVPFLG Release Delay Time OVPFLG Release Delay Time (RLOAD = 100, OVP Trip Point 6.75V) (RLOAD = 100, OVP Trip Point 6.25V) 8 7 7 5 4 3 2 OVPFLG Voltage (bottom) (V) 6 Input Voltage (top) (V) 8 OVPFLG Voltage (bottom) (V) Input Voltage (top) (V) Time (1s/div) 6 5 4 3 2 1 1 0 0 Time (50s/div) Time (50s/div) OVP Switch Release Delay Time OVP Switch Release Delay Time (RLOAD = 100, All 40s Delay Options) (RLOAD = 100, All 80ms Delay Options) 12 8 8 10 6 6 4 6 4 2 Input Voltage (top) (V) 10 8 4 6 2 4 0 2 0 0 -2 Time (10s/div) 8 Time (50ms/div) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 INCHR Voltage (bottom) (V) 10 INCHR Voltage (bottom) (V) Input Voltage (top) (V) OVPFLG Voltage (bottom) (V) OVPFLG Voltage (bottom) (V) Input Voltage (top) (V) 7 6 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Typical Characteristics-OVP Over-Voltage Protection Response Time (RLOAD = 100, All 80ms Delay Options) (RLOAD = 100, All 40s Delay Options) 10 8 8 4 2 8 0 6 4 6 4 2 8 0 6 4 2 2 0 0 Time (50ms/div) Time (10s/div) OVP Trip Point vs. Temperature Battery Recharge Voltage Threshold vs. Temperature (RSET = 1.58K) 3696-1, -2 3696-5, -6 6.80 6.60 6.40 6.20 -15 10 35 Temperature (C) 60 85 4.110 Battery Recharge Voltage Threshold (V) OVP Trip Point (V) 7.00 6.00 -40 INCHR Voltage (bottom) (V) 6 Input Voltage (top) (V) 10 INCHR Voltage (bottom) (V) Input Voltage (top) (V) Over-Voltage Protection Response Time 4.105 4.100 4.095 4.090 4.085 4.080 4.075 4.070 -40 -15 10 35 60 85 Temperature (C) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 9 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Typical Characteristics-LDO (ILDOOUT = 30mA) Output Voltage Accuracy (%) LDO Output Voltage Accuracy vs. Input Voltage (ILDOOUT = 10mA) Output Voltage Accuracy (%) LDO Output Voltage Accuracy vs. Input Voltage 0.20 0.15 0.10 0.05 0.00 -0.05 -0.10 85C 25C -40C -0.15 -0.20 5.1 5.3 5.5 5.7 5.9 6.1 6.3 6.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 85C 25C -40C -0.3 -0.4 5.1 5.3 5.5 Input Voltage (V) LDO Output Voltage Accuracy vs. Temperature Output Voltage Accuracy (%) Output Voltage Accuracy (%) 0.800 0.600 0.400 0.200 0.000 -0.200 -0.400 -0.600 -0.800 10 35 60 85 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 -40 -15 10 Output Voltage Accuracy (%) Output Voltage (V) 4.890 4.880 4.870 4.860 4.850 4.840 4.830 4.820 4.810 4.800 Temperature (C) 10 60 85 (VIN = 5.1V; VLDOOUT = 4.9V) 4.900 35 35 LDO Output Voltage Accuracy vs. Output Current (ILDOOUT = 10mA) 10 6.5 Temperature (C) LDO Output Voltage vs. Temperature -15 6.3 1.0 Temperature (C) -40 6.1 (ILDOOUT = 30mA) 1.000 -15 5.9 LDO Output Voltage Accuracy vs. Temperature (ILDOOUT = 10mA) -1.000 -40 5.7 Input Voltage (V) 60 85 0.1 85C 25C -40C 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 0 5 10 15 20 25 Output Current (mA) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 30 35 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Typical Characteristics-LDO LDO Load Transient LDO Load Transient (VIN = 5.4V; ILDOOUT = 1mA to 30mA; COUT = 1F) (VIN = 5.4V; ILDOOUT = 10mA to 30mA; CLDOOUT = 1F) 60 20 0 100 50 0 Output Current (top) (mA) 40 20 0 100 50 0 -50 -50 -100 -100 Time (100s/div) Output Voltage (bottom) (mV) 40 Output Voltage (bottom) (mV) Output Current (top) (mA) 60 Time (100s/div) LDO Line Transient LDO Dropout Voltage vs. Output Current 8 6 5 5.1 4 5 4.9 4.8 4.7 4.6 Output Voltage (bottom) (V) Input Voltage (top) (V) 7 LDO Dropout Voltage (mV) (VIN = 5.4V to 6.4V; ILDOOUT = 30mA; CLDOOUT = 1F) 300 250 200 150 100 85C 25C -40C 50 0 0 Time (100s/div) 5 10 15 20 25 30 Output Current (mA) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 11 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Functional Block Diagram INCHR OVP Switch Reverse Blocking BAT IN OVPFLG LDOOUT OVP Sense and Control Current Compare CV/ Pre-charge Constant Current UVLO 4.9V/30mA LDO Charge Control B ATS Over-Temp Protect MODE ISET IC STAT EN Charge Status GND Functional Description Preconditioning Charge The AAT3696 is a high performance battery charger IC designed to charge single-cell Lithium-Ion or Polymer batteries with up to 1.6A of current from external power source. It is a stand alone charging solution requiring minimum input components. Also included a fast turn-off over-voltage protection (OVP) circuits with +28V and this OVP consist of a low resistance P-channel MOSFET in series with the charge control MOSFET. The AAT3696 also designed with of under-voltage lockout protection, over-voltage monitor, fast shut-down circuitry with a fault output flag, and a 4.9V LDO with 30mA output through the OVP switch. Battery charging commences only after the AAT3696 checks several conditions in order to maintain a safe charging environment. The input supply must be above the minimum operating voltage, or under-voltage lockout threshold (VUVLO) and the enable pin must be low for the charging sequence to begin. When these conditions have been met and a battery is connected to the BAT pin, the AAT3696 checks the state of the battery and determines which charging mode to apply. If the battery voltage is below the preconditioning voltage threshold (VMIN), then the AAT3696 begins preconditioning the cell (trickle charging) by charging at 10% of the programmed constant current. For example, if the programmed fast charge current is 1600mA, then the preconditioning (trickle charge) current is 160mA. Battery cell preconditioning is a safety precaution for deeply discharged cells and will also reduce the power dissipation in the internal series pass transistor when the voltage across the device is at greatest potential. Battery Charging Operation Figure 1 illustrates the entire battery charging profile or operation, which consist of three phases: 1. 2. 3. 4. 12 Preconditioning (Trickle) Charge Constant Current Charge Constant Voltage Charge Automatic Recharge when MODE = High Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Constant Current Charge Battery cell preconditioning charge continues until the battery voltage reaches the preconditioning voltage threshold (VMIN). At this point, the AAT3696 begins constant current charge. The current level for this mode is programmed using a single resistor from the ISET pin to ground. The programmed current can be set at a minimum 100mA up to a maximum of 1.6A. The AAT3696 has two charge termination control selections which can be set by the MODE pin. MODE = 0 (Ground or logic low) The charger regulates battery voltage at 4.2V or 4.375V optional voltage and continues to charge the battery with a current lower than the programmed charge termination current until the AAT3696 is disabled by applying logic high to the EN pin to stop charging. Constant Voltage Charge MODE = 1 (INCHR or logic high) Constant current charge will continue until the battery voltage reaches the constant output voltage threshold, VCO (REG). The AAT3696 will then transition to constant voltage mode, where the charge IC regulates the battery voltage at constant output voltage (factory programmed to 4.2V or 4.375V). The charging current at this phase will decrease until the charge termination current or 10% of the programmed constant current is reached. The charger turns off the series pass device and automatically goes into a power-saving sleep state. During this time, a series pass device blocks the current in both directions, preventing the battery from discharging through the IC. The AAT3696 will remain in sleep mode until the battery voltage drops below the VRCH threshold or the charger is enabled or input power is recycled. The AAT3696 will resume charging operation if no fault is detected. VCO(REG) VRCH ICH_CC VMIN Charger Turns OFF When MODE = High Battery Voltage Charger Stays ON When MODE = Low Charger Turns ON ICH_TRK ICH_TERM Battery Current Preconditioning Charge Constant Current Charge Constant Voltage Charge Battery Recharge EN Figure 1: Current vs. Voltage Profile during Charging Phases. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 13 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Charger Operational Flowchart ADP Voltage Power Input S Voltage ADP > VADPP VIN>VUVLO ? Power Sleep On Sleep Reset Mode Mode No Yes Yes Fault Conditions Monitoring? BOV, OT No Power Select EN = High ? No Yes OVP Condition Monitoring VIN > VOVP Charge Suspended Yes Shut Disconnect Input ShutDown Down fromMode charger Mode No Preconditioning Test VV VBAT MIN >>V MIN Yes Preconditioning Shut ShutDown Down (Trickle Charge) Mode Mode BAT No No Recharge Test V BAT < VRCH Yes Current Phase Test VCO(REG) > V BAT Yes Constant Shut Down ShutCurrent Down Charge Mode Mode Mode VCH >VBAT No Voltage Phase Test IBAT > ITERM Yes Constant Shut Down ShutVoltage Down Charge Mode Mode Mode IBAT> MIN I No Mode = 0 ? IBAT> MIN I Yes Continuously Shut ShutDown Down Charging at Mode Mode Constant Voltage No Charge Charge Completed Completed 14 Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Charge Status Output The AAT3696 provides battery charging status via a status pin, STAT. This pin is internally connected to an N-channel open-drain MOSFET, which can be used as a logic signal, or drive an external LED. The charge status indication pin (STAT) pulls high indicating charge completion or charge termination, regardless of the selection of the charge termination mode, as long as the charge termination current is reached. The status pin indicates the following conditions described in Table 1: Charge Status Status Battery is charging Charging is completed When EN is high Low High High Table 1: LED Status Indicator. Enable/Disable The AAT3696 provides an enable function to control the charger IC on and off. The enable (EN) pin is internally pulled down with 200k. When EN is pulled down or left floating, normal device operation commences. When it is pulled to a logic high level, the AAT3696 charging circuit will be shut down and forced into sleep state but the over-voltage protection circuit remains in active state. Charging will be halted regardless of the battery voltage or charging state. When the device is re-enabled, the charge control circuit will automatically reset and resume charging functions with the appropriate charging mode based on the battery charge state and measured cell voltage at the BAT pin. Low Dropout Regulator The AAT3696 includes a low dropout regulator with input range from 5V to the OVP trip point which is 6.75V or 6.25V and is always enabled. The LDO output VOUT is set to 4.9V and supplies a continuous current up to 30mA. The LDO output needs to be decoupled with 2.2F to ground for stability reasons. Over-Voltage Protection In normal operation, an OVP switch acts as a load switch, connecting the power source from IN to INCHR. This switch is designed with very low resistance to minimize the voltage drop between the power source and the charger and to reduce the power dissipation. When the voltage on the power source exceeds the OVP trip point, 6.75V or 6.25V respectively, the switch immediately becomes open (OFF) and disconnect the load and the charger from the power source therefore, preventing damage to any downstream components. Simultaneously, the fault flag is raised, alerting the system. If an overvoltage condition is applied at the time of the device enable, the switch remains open (OFF). Under-Voltage Lockout (UVLO) The AAT3696 has a 3V (maximum) under-voltage lockout level (UVLO). When the input voltage is less than the UVLO level, the OVP switch and the charger are turned off. It is designed with 150mV hysteresis to ensure circuit stability. Over-Voltage Fault Flag Output The over-voltage fault flag (OVPFLG) is an active-low open-drain fault reporting output. A pull-up resistor should be connected from to I/O voltage of the system. In the event of an over-voltage condition OVPFLG will be asserted immediately with approximately 1s inherited internal circuit delay. After the over-voltage fault is released, OVPFLG will be de-asserted with 1.5s delay (optional of 80ms delay). Battery Over-Voltage Protection An over-voltage event is defined as a condition where the voltage at the BAT pin exceeds the maximum battery charge voltage and is set by the battery over-voltage protection threshold (VBOVP). If an overvoltage condition occurs sensed by the BATS pin, the AAT3696 charge control will shut down the device until voltage at the BAT pin drops below VBOVP. The AAT3696 will resume normal charging operation after the over-voltage condition is removed. Over-Temperature Shutdown The AAT3696 has a thermal protection control circuit which will shut down charging functions if the internal die temperature exceed the preset thermal limit threshold of 140C. Once the internal die temperature falls below the thermal limit, normal operation will resume the previous charging state. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 15 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Application Information Battery Connection and Battery Voltage Sensing Constant Charge Current Battery Connection (BAT) The constant current charge level is user programmed with a set resistor connected between the ISET 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 2. Charge current setting formula: ICH_CC (typ) = VISET * KIISET RSET Constant Charge Current (mA) Set Resistor Value (k) 110 200 400 500 600 800 1000 1500 15.8 7.87 3.92 3.16 2.67 1.96 1.58 1.00 Figure 2 shows the relationship of constant charging current and set resistor values for the AAT3696. Charging Current vs. Set Resistor Values Charging Current (mA) 10000 1000 100 10 1 10 100 RSET (k ) Figure 2: Constant Charging Current vs. Set Resistor Values. Note: The ISET pin is very sensitive and if a total capacitive load of more than 20pF is connected, it may start oscillating. 16 Battery Voltage Sensing (BATS) The BATS pin is provided to employ an accurate voltage sensing capability to measure the positive terminal voltage at the battery cell being charged. This function reduces measured battery cell voltage error between the battery terminal and the charge control IC. The AAT3696 charge control circuit will base charging mode states upon the voltage sensed at the BATS pin. The BATS pin must be connected to the battery terminal for correct operation. If the battery voltage sense function is not needed, the BATS pin should be terminated directly to the BAT pin. If there is concern of the battery sense function inadvertently becoming an open circuit, the BATS pin may be terminated to the BAT pin using a 10k resistor. Under normal operation, the connection to the battery terminal will be close to 0; if the BATS connection becomes an open circuit, the 10k resistor will provide feedback to the BATS pin from the BAT connection with a voltage sensing accuracy loss of 1mV or less. Status Indicator Display Table 2: RSET Values. 1 0.1 A single cell Li-Ion/Polymer battery should be connected between BAT input and ground. Simple system charging status states can be displayed using one LED in conjunction with the STAT pin on the AAT3696. This pin has a simple switch connecting the LED's cathode to ground. Refer to Table 1 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 STAT pin. LED current consumption will add to the overall thermal power budget for the device package, so it is wise to keep the LED drive current to a minimum. 2mA should be sufficient to drive most low cost green or red LED. 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(STAT) = VADP - VFLED ILED(STAT) Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Charger Input Capacitor Example: RB(STAT) = 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(STAT) = VUSB - VFLED ILED(STAT) Example: RB(STAT) = 5.0V - 3.2V = 900 2mA Green LED forward voltage (VF) is typically 3.2V @ 2mA. IC Input The AAT3696 has an IC input pin which is internally connected to ground through a 100k resistor. Capacitor Selection Input Capacitor A 1F or larger capacitor is typically recommended for CIN. CIN should be located as close to the device IN pin as practically possible. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for CIN. There is no specific capacitor equivalent series resistance (ESR) requirement for CIN. However, for higher current operation, ceramic capacitors are recommended for CIN 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. A 2.2F decoupling capacitor is recommended to be placed between INCHR and GND. Charger Output Capacitor The AAT3696 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. If the AAT3696 is used in applications where the battery can be removed from the charger, such as desktop charging cradles, an output capacitor greater than 10F may be required to prevent the device from cycling on and off when no battery is present. Linear Regulator Output Capacitor For proper load voltage regulation and operational stability, a capacitor is required between LDOOUT and GND. The output capacitor connection to the LDO regulator 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 AAT3696 should use 2.2F or greater values for the LDO's output capacitor. Printed Circuit Board Layout Recommendations For proper thermal management and to take advantage of the low RDS(ON) of the AAT3696, 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 AAT3696 TDFN3x3 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 the heat being transferred to the PCB effectively. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 17 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Figure 3: AAT3696 Evaluation Board Top Layer. Figure 4: AAT3696 Evaluation Board Bottom Layer. LDO +5 R3 D1 Red LED EN 4V - 28V VIN GND 1k R2 Green LED 1k D2 JP1 5 8 2 1 2 C1 1F MODE 6 7 JP2 C4 2.2F U1 4 OVPFLG STAT EN IC LDOOUT BATS BAT 10 3 11 INCHR IN MODE GND AAT3696 1 2 12 INCHR ISET 1 9 C3 10F C2 2.2F R1 1.6k Figure 5: AAT3696 Evaluation Board Schematic. 18 Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 BAT GND DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Component Part Number Description Manufacturer U1 R1 R2, R3 C1 C2, C4 C3 JP1, JP2 D1 D2 AAT3696IWP Chip Resistor Chip Resistor GRM31MR71H105KA88 GRM188R61A225KE34 GRM21BR71A106KE51L PRPN401PAEN LTST-C190CKT LTST-C190GKT 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-12 Package 1.6k, 1%, 1/4W; 0603 1k, 5%, 1/4W; 0603 Ceramic 1F 50V 10% X7R 1206 Ceramic 2.2F 10V 10% X5R 0603 Ceramic 10F 10V 10% X7R 0805 Conn. Header, 2mm zip Red LED; 0603 Green LED; 0603 Skyworks Vishay Vishay Murata Murata Murata Sullins Electronics Lite-On Inc. Lite-On Inc. Table 3: AAT3696 Evaluation Board Bill of Materials (BOM). AAT3696 Feature Options Product Constant Voltage Regulation (V) OVP Trip Point (V) OVP Turn On Delay Time (s) Preconditioning Voltage Threshold (V) AAT3696-1 AAT3696-2 AAT3696-3 AAT3696-4 AAT3696-5 AAT3696-6 AAT3696-7 AAT3696-8 AAT3696-9 AAT3696-10 AAT3696-11 AAT3696-12 AAT3696-13 AAT3696-14 AAT3696-15 AAT3696-16 4.2 4.2 4.375 4.375 4.2 4.2 4.375 4.375 4.2 4.2 4.375 4.375 4.2 4.2 4.375 4.375 6.75 6.75 6.75 6.75 6.25 6.25 6.25 6.25 6.75 6.75 6.75 6.75 6.25 6.25 6.25 6.25 40 80,000 40 80,000 40 80,000 40 80,000 40 80,000 40 80,000 40 80,000 40 80,000 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2 Table 4: AAT3696 Options. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 19 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Ordering Information Package Marking1 Part Number (Tape and Reel)2, 3 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 TDFN33-12 6EXYY 6FXYY AAT3696IWP-1-T1 AAT3696IWP-2-T1 AAT3696IWP-3-T1 AAT3696IWP-4-T1 AAT3696IWP-5-T1 AAT3696IWP-6-T1 AAT3696IWP-7-T1 AAT3696IWP-8-T1 AAT3696IWP-9-T1 AAT3696IWP-10-T1 AAT3696IWP-11-T1 AAT3696IWP-12-T1 AAT3696IWP-13-T1 AAT3696IWP-14-T1 AAT3696IWP-15-T1 AAT3696IWP-16-T1 6GXYY 6HXYY 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. 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 3. For detailed description of all options, refer to Table 4 on page 19. 20 Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 DATA SHEET AAT3696 1.6A Li-Ion Battery Charger in a 3x3 TDFN Package Package Information TDFN33-121 Index Area 0.40 0.05 Detail "A" 0.45 0.05 2.40 0.05 3.00 0.05 0.1 REF C0.3 3.00 0.05 1.70 0.05 Top View Bottom View 0.23 0.05 Pin 1 Indicator (optional) 0.05 0.05 0.23 0.05 0.75 0.05 Detail "A" Side View All dimensions in millimeters. 1. 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. 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. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. 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Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks, the Skyworks symbol, and "Breakthrough Simplicity" are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 201897B * Skyworks Proprietary Information * Products and Product Information are Subject to Change Without Notice. * April 27, 2012 21