DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package General Description Features The AAT3698-1/-2 BatteryManager™ is a single-cell lithium-ion (Li-Ion)/Li-Polymer battery charger IC designed to operate from a USB port or AC adapter with an input voltage of up to 7.0V. For increased safety, the AAT36981/-2 also includes over-voltage input protection (OVP) up to 28V. • • • • • The AAT3698-1/-2 precisely regulates battery voltage for 4.2V Li-Ion/Polymer battery cells through a low RDS(ON) switch. The charging current can be set by an external resistor up to 1.6A. If an over-voltage condition occurs from the input, the series switch quickly opens and a fault flag is activated, preventing damage to the battery and the 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 AAT3698-1/-2 also includes a 5.0V LDO linear regulator with over-voltage protection that can supply loads of up to 50mA. USB or AC Adapter System Power Charger 3.0V ~ 7.0V Input Voltage Range Fast Over-Voltage Protection Turn Off OVP Trip Threshold: 7.25V (typ) High Level of Integration with Internal: ▪ Power Device ▪ Reverse Current Blocking ▪ Current Sensing 5V/50mA LDO Output Programmable Fast Charge Current from 50mA to 1.6A Programmable Charge Termination Current Charge Status Indicator Power OK Indicator Battery Absence Detection Input Pin Automatic Termination and Recharge Sequencing (AAT3698-1 Only) Automatic Trickle Charge For Battery Pre-Conditioning Emergency Thermal Shutdown Protection Digitally Controlled Thermal Loop Regulation Active Low Enable with Internal 200kΩ Pull-Down Resistor Output for Auto-Booting 14-pin 3x3mm TDFN Package Applications The AAT3698-1/-2 is available in the Pb-free, thermally enhanced, space-saving 3x3mm TDFN33-14 package and is rated over the -40°C to +85°C temperature range. • • • • • • Bluetooth™ Headsets, Headphones, Accessories Digital Still Cameras Mobile Telephones Personal Data Assistants (PDAs) MP3 Players Other Lithium-Ion/Polymer Battery-Powered Devices Typical Application 10.9mm IN VIN C1 1μF NOBAT BAT INCHR R1 EN 11.5mm C4 ABI 1μF ABO IC C2 1μF ON/OFF 5V Battery Pack AAT3698-x LDOOUT R2 STAT POK LDOOUT C3 1μF ISET TERM GND R3 R4 U1 C1 C2, C3 C4 R1 R2 R3 R4 AAT3698-x GRM31MR71H105KA88 GRM188R61A225KE34 GRM21BR71C105KA01L 1.5kΩ, 5%, 1/4W, 0603 1.5kΩ, 5%, 1/4W, 0603 13.3kΩ, 1%, 1/4W, 0603 1.58kΩ, 1%, 1/4W, 0603 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 1 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Pin Description Pin # Name Type 1 2 3 4 5 6 INCHR IN LDOOUT POK STAT ABO I/O I O O O O 7 TERM I 8 9 GND EN I I 10 ISET I 11 IC I 12 NOBAT I 13 14 EP ABI BAT I O Function OVP output switch and battery charger input; decouple to GND with 1μF capacitor. Input from USB port or adapter connector. 5V/50mA LDO output through OVP device; bypass to GND with 1μF capacitor. Power OK flag pin; open drain, active low. Charge status indicator pin; open drain, active low. Auto booting output. Connect the RTERM resistor between the TERM pin and ground to set the charge termination current. When the TERM pin is connected to INCHR, charge current termination level is set to 10% of the programmed fast charge current. Power ground. Enable pin, active low. Internally connected to ground through a 200kΩ pull-down resistor. Connect RSET resistor to this pin to set charging current. Connect a 10kΩ resistor from this pin to the system to monitor this pin's voltage. Internally connected; connect this pin to ground. No battery detection input. If the NOBAT pin is left unconnected, charging is disabled. Internally pulled to LDOOUT pin through a 1.6MΩ pull-up resistor. Auto booting input. Internally connected to ground through a 200kΩ pull-down resistor. Connect to Li-Ion battery. Exposed paddle; connect to ground. Pin Configuration TDFN33-14 (Top View) INCHR IN LDOOUT POK STAT ABO TERM 2 1 14 2 13 3 12 4 11 5 10 6 9 7 8 BAT ABI NOBAT IC ISET EN GND Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Absolute Maximum Ratings1 Symbol VIN VP VN TJ TA TLEAD Description IN continuous INCHR, EN, STATB, POK, ABI, NOBAT BAT, ISET, TERM, LODOUT, ABO, 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 VINCHR + 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 (TDFN33-14) 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 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 3 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Electrical Characteristics1 VIN = 5V, RSET = 3.16kΩ, VENB = VNOBAT = 0V, CIN = 1μF, CINCHR = 1μF, CBAT = 1μF, CLDOOUT = 1μF, TERM = ABI = IC = open, TA = -40 to +85°C, unless otherwise noted. Typical values are at TA = 25°C. Symbol Description Operation VIN_MAX Input Over-Voltage Protection Range VIN Normal Operating Input Voltage Range IOP Operating Current ISD Charge Function Shutdown Supply Current IBAT_LEAK Leakage Current from BAT Pin Over-Voltage Protection Over-Voltage Protection Trip Voltage VOVP VOVP_HYS Hysteresis VIN_BAT_OS VIN – VBAT Offset Voltage Drop Out Voltage Between IN and INCHR Pins VINCHR_DO Battery Charger VUVLO Under-Voltage Lockout Threshold VUVLO_HYS Hysteresis Drop Out Voltage Between INCHR and BAT VCHG_DO Pins VBOVP Battery Over-Voltage Protection Threshold BAT Pin Voltage Regulation Constant Regulated Output Voltage2 VCO(REG) VCO/VCO Constant Output Voltage Tolerance Battery Recharge Voltage Threshold (AAT3698-1 only) VMIN Preconditioning Voltage Threshold Current Regulation Charge Current Programmable Range ICC_RANGE VRCH ICH_CC Constant-Current Mode Charge Current VISET ISET Pin Voltage ICH_TRK% KISET VTERM VEXTERM_DIS VEXTERM_EN ITERM ICH_TERM% Trickle Charge Current Ratio Conditions Min Typ Max Units 300 190 2 28 7.0 450 250 5 V V μA μA μA 7.25 200 300 200 200 7.45 V mV 2.8 200 3.0 3.0 VBAT = 4.3V, RSET = 15.8kΩ VENB = 5V, VBAT = 4.3V VBAT = 4V, IN Pin Open VIN Rising Edge 7.05 VIN Rising, VBAT = 4V VIN Falling, VBAT = 4V VIN = 5V, IBAT = 500mA, RSET = 1.58kΩ VIN Rising Edge 2.6 VIN = 4.2V, IBAT = 500mA, RSET = 1.58kΩ RISET = 31.6kΩ, IBAT = 10mA RISET = 31.6kΩ, IBAT = 10mA, TA= 25°C RISET = 31.6kΩ, IBAT = 10mA, TA= -40 to +85°C RSET = 15.8kΩ, VBAT = 3.6V RSET = 3.16kΩ, VBAT = 3.6V RSET = 1.58kΩ, VBAT = 3.6V TA = 25°C VBAT = 3.6V TA = -40 to +85°C RSET = 3.16kΩ, VBAT = 2.0V mV mV 4.4 V 4.20 V +0.5 -1 +1 % 2.4 VCO(REG) - 0.1 2.6 2.8 V 100 -15% -10% -10% 1.97 1.9 1600 +15% +10% +10% 2.03 2.1 mA 100 500 1000 2 2 5 10 20 TERM Pin Voltage Range External Termination Disable Threshold3 External Termination Enable Threshold4 TERM Pin Output Current RSET = 15.8kΩ, VBAT = 3.6V RSET = 3.16kΩ, VBAT = 3.6V From off to full charge VIN = 5V, measured on TERM pin VIN = 5V, measured on TERM pin VTERM = 0.2V -10% 15 3.5 +10% Charge Termination Threshold Current Ratio VTERM = 0.2V or tied to INCHR pin 5 10 20 Charge Current Set Factor: ICH_CC/IISET V mV 100 -0.5 VBAT falling VBAT rising mV mA V V % of ICH_CC 790 790 0 4.8 2.0 V V V μA % of ICH_CC 1. The AAT3698-1/-2 is guaranteed to meet performance specifications over the -40 to +85°C operating temperature range and is assured by design, characterization and correlation with statistical process controls. 2. When no battery is connected, the BAT pin output voltage is regulated at 4.2V. 3. Internal Termination function is selected when VTREM > VEXTREM_DIS. 4. External Termination function is selected when VTREM < VEXTREM_EN. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Electrical Characteristics (continued)1 VIN = 5V, RSET = 3.16kΩ, VENB = VNOBAT = 0V, CIN = 1μF, CINCHR = 1μF, CBAT = 1μF, CLDOOUT = 1μF, TERM = ABI = IC = open, TA = -40 to +85°C, unless otherwise noted. Typical values are at TA = 25°C. Symbol Description Logic Control / Battery Protection VEN(H) Input High Threshold VEN(L) Input Low Threshold REN Input Pull Down Resistor VNOBAT(H) Input High Threshold VNOBAT(L) Input Low Threshold RNOBAT Input Pull Up Resistor VABI(H) Input High Threshold VABI(L) Input Low Threshold RABI Input Pull Down Resistor VABO(H) Output High Voltage VABO(L) Output Low Voltage VSTAT Output Low Voltage ISTAT_OFF STAT Pin Leakage Current VPOK Output Low Voltage IPOK_OFF POK Pin Leakage Current TOVPRES Over-Voltage Response Time OVP Switch OVP Release Turn-On Delay Time POK OFF Delay Time from OverTDLY_POK Voltage POK ON Delay Time from OverTREDLY_POK Voltage OVP Switch Startup Turn-On Delay TOVPSTARTON Time Thermal Protection THREG Thermal Loop Regulation Chip Thermal Shutdown THSHDN Temperature 5V LDO TOVPON VLDOOUT LDOOUT Voltage Tolerance VDO IOUT_LIM VLDOOUT_LR VLDOOUT_DM LR VLDOOUT_DM LD Dropout Voltage from IN LDO Output Current Limit Line Regulation Dynamic Line Regulation Dynamic Load Regulation Conditions Min Typ Max 1.2 0.4 200 1.2 0.4 1600 VIN = 0V, VBAT = 4.2V VIN = 0V, VBAT = 4.2V 1.2 0.4 200 VBAT = 4.2V, IABO = -5mA (sourcing) VBAT = 4.2V, IABO = 5mA (sinking) VBAT – 1V 0.4 0.4 1 0.4 1 VSTAT = 5.5V, VEN = 5V IPOK = 5mA VPOK = 5.5V, VIN = 7V VIN voltage step up from 6V to 8V, RLOAD = 100Ω, CINCHR = 1μF VIN voltage step down from 8V to 6V, RLOAD = 100Ω, CINCHR = 1μF VIN voltage step up from 6V to 8V, RLOAD = 100Ω, CINCHR = 1μF VIN voltage step down from 8V to 6V, RLOAD = 100Ω, CINCHR = 1μF VIN voltage step up from 0V to 5V, RLOAD = 100Ω, CINCHR = 1μF Threshold Hysteresis TA = 25°C VIN = 5.5V, ILDOOUT = 0mA to 30mA TA = -40 to +85°C IOUT = 30mA, VIN = 5.0V VIN = 5.5V, VLDOOUT = 4.5V VIN = 5.4V to 6.4V, ILDOOUT = 30mA IOUT = 30mA, VIN = 5.4V to 6.4V, TR/TF = 2μs IOUT = 1mA to 30mA, TR = <5μs, VIN = 5.5V 4.9 4.75 55 Units V V k V V k V V k V V V μA V μA 0.1 μs 60 μs 0.1 μs 1.5 μs 220 μs 110 140 15 ºC ºC 5.0 5.0 160 90 5.1 5.25 300 125 10 200 60 V mV mA mV mV mV 1. The AAT3698-1/-2 is guaranteed to meet performance specifications over the -40 to +85°C 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 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 5 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Constant Charging Current vs. RSET Resistor Values Operating Current vs. RSET Resistor Values 2400 10000 Operating Current (mA) Constant Charging Current (mA) Typical Characteristics−Battery Charger 1000 100 10 1 0.1 1 10 Preconditioning Mode Constant Current Mode 2100 1800 1500 1200 900 600 300 0 0.1 100 1 10 RSET (KΩ Ω) Battery Charging Current vs. Temperature Battery Charging Current vs. Temperature (RSET = 3.16KΩ; ICH_CC = 500mA) Battery Charge Current (mA) Battery Charge Current (mA) (RSET = 1.58KΩ; ICH_CC = 1000mA) 1100 1080 1060 1040 1020 1000 980 960 940 920 900 -40 -15 10 35 60 85 550 540 530 520 510 500 490 480 470 460 450 -40 -15 10 Temperature (°C) 950 900 850 VBAT = 3.3V VBAT = 3.6V VBAT = 3.9V VBAT = 4.1V 800 750 5.2 5.5 5.8 6.1 Input Voltage (V) 6 6.4 6.7 7.0 Battery Charging Current (mA) Battery Charging Current (mA) 1000 4.9 85 (RSET = 3.16KΩ) 1050 4.6 60 Battery Charging Current vs. Input Voltage (RSET = 1.58KΩ) 4.3 35 Temperature (°C) Battery Charging Current vs. Input Voltage 700 4.0 100 RSET (KΩ Ω) 560 540 520 500 480 460 VBAT = 3.3V VBAT = 3.6V VBAT = 3.9V VBAT = 4.1V 440 420 400 4.0 4.3 4.6 4.9 5.2 5.5 5.8 6.1 6.4 Input Voltage (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 6.7 7.0 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Typical Characteristics−Battery Charger Shutdown Current vs. Input Voltage 1200 RSET = 1.5KΩ RSET = 1.96KΩ 1000 RSET = 2.61KΩ RSET = 3.16KΩ 300 RSET = 7.87KΩ Shutdown Current (μA) Battery Charging Current (mA) Battery Charging Current vs. Battery Voltage 800 600 400 200 0 2.2 2.5 2.8 3.1 3.4 3.7 4.0 260 220 180 85°C 25°C -40°C 140 100 5.0 4.3 5.5 Battery Voltage (V) Preconditioning Charge Current vs. Temperature 7.0 (RSET = 3.16KΩ; ICH_CC = 500mA) Preconditioning Charge Current (mA) Preconditioning Charge Current (mA) (RSET = 1.58KΩ; ICH_CC = 1000mA) 106 102 98 94 55 54 53 52 51 50 49 48 47 46 45 -15 10 35 60 85 -40 -15 Temperature (°C) 10 35 60 85 Temperature (°C) Constant Output Voltage vs. Temperature Constant Output Voltage vs. Temperature (RSET = 1.58KΩ; ICH_CC = 1000mA) (RSET = 3.16KΩ; ICH_CC = 500mA) 4.31 Constant Output Voltage (V) Constant Output Voltage (V) 6.5 Preconditioning Charge Current vs. Temperature 110 90 -40 6.0 Input Voltage (V) 4.28 4.25 4.22 4.19 4.16 4.13 4.10 -40 -15 10 35 Temperature (°C) 60 85 4.31 4.28 4.25 4.22 4.19 4.16 4.13 4.10 -40 -15 10 35 60 85 Temperature (°C) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 7 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Typical Characteristics−Battery Charger Enable Low Voltage vs. Input Voltage Enable High Voltage vs. Input Voltage 0.910 Enable High Voltage (V) Enable Low Voltage (V) 0.80 0.78 0.76 0.74 0.72 85°C 25°C -40°C 0.70 0.68 5.0 5.2 5.4 5.6 5.8 6.0 6.2 6.4 6.6 6.8 0.905 0.900 0.895 0.890 85°C 25°C -40°C 0.885 0.880 5.0 7.0 5.2 5.4 Input Voltage (V) 6.0 6.2 6.4 6.6 6.8 7.0 Battery Recharge Voltage Threshold vs. Temperature (RSET = 1.58KΩ; ICH_CC = 1000mA; AAT3698-1) (RSET = 3.16KΩ; ICH_CC = 500mA; AAT3698-1) 4.20 Battery Recharge Voltage Threshold (V) 4.20 Battery Recharge Voltage Threshold (V) 5.8 Input Voltage (V) Battery Recharge Voltage Threshold vs. Temperature 4.18 4.16 4.14 4.12 4.10 4.08 4.06 4.04 4.02 4.00 -40 5.6 -15 10 35 60 4.18 4.16 4.14 4.12 4.10 4.08 4.06 4.04 4.02 4.00 -40 85 Temperature (°C) -15 10 35 60 85 Temperature (°C) Typical Characteristics−OVP OVP On Time OVP Response Time (RLOAD = 100Ω) (RLOAD = 100Ω) 6.0 5.0 6 4 2 0 -2 Time (50μs/div) 8 Input Voltage (top) (V) Input Voltage (top) (V) 7.0 9.0 8.0 7.0 6.0 6 5.0 4 2 0 -2 Time (50μs/div) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 INCHR Voltage (bottom) (V) 8.0 INCHR Voltage (bottom) (V) 9.0 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Typical Characteristics−OVP OVP Trip Point Threshold Voltage vs. Temperature POK ON Delay Time (RLOAD = 100Ω) Input Voltage (top) (V) 9.0 7.20 7.15 7.10 7.05 7.00 6.95 -40 Rising Threshold Falling Threshold -15 10 8.0 7.0 6 6.0 4 2 0 -2 -4 35 60 POK Voltage (bottom) (V) OVP Trip Point Threshold Voltage (V) 7.25 85 Temperature (°C) Time (2μs/div) LDO Load Transient LDO Load Transient (VIN = 5.4V; IOUT = 1mA to 30mA; COUT = 1μF) (VIN = 5.4V; IOUT = 10mA to 30mA; COUT = 1μF) 300 40 250 20 200 20 0 100 50 0 Output Current (top) (mA) 60 40 0 150 -20 100 -40 50 -60 0 -50 -80 -50 -100 -100 -100 Time (100μs/div) Output Voltage (bottom) (mV) 60 Output Voltage (bottom) (mV) Output Current (top) (mA) Typical Characteristics−LDO Time (100μs/div) LDO Line Transient (VIN = 5.4V to 6.4V; IOUT = 30mA; COUT = 1μF) 6 5 5.1 5 4.9 4.8 Output Voltage (bottom) (V) Input Voltage (top) (V) 7 4.7 4.6 Time (100μs/div) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 9 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Typical Characteristics−LDO LDO Output Voltage vs. Temperature (IOUT = 10mA) (IOUT = 10mA) 0.500 5.010 0.400 LDO Output Voltage (V) LDO Output Voltage Error (%) LDO Output Voltage Accuracy vs. Temperature 0.300 0.200 0.100 0.000 -0.100 -0.200 -0.300 -0.400 -0.500 -40 -15 10 35 60 5.005 5.000 4.995 4.990 4.985 4.980 -40 85 -15 Temperature (°C) LDO Output Voltage Accuracy vs. Input Voltage LDO Output Voltage Error (%) Output Voltage Error (%) 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 85°C 25°C -40°C -0.6 -0.8 5.6 5.8 6.0 6.2 60 85 (VIN = 5.5V) 1.0 5.4 35 LDO Output Voltage Accuracy vs. Output Current (IOUT = 30mA) -1.0 5.2 10 Temperature (°C) 6.4 6.6 6.8 7.0 1 85°C 25°C -40°C 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0.1 1.0 Input Voltage (V) 10 100 Output Current (mA) Dropout Voltage vs. Output Current Dropout Voltage vs. Temperature (IOUT = 30mA) 250 Dropout Voltage (mV) Dropout Voltage (mV) 250 200 150 100 85°C 25°C -40°C 50 0 0 5 10 15 20 25 Output Current (mA) 10 30 35 200 150 100 50 0 -40 -15 10 35 60 Temperature (°C) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 85 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Functional Block Diagram Reverse Blocking OVP Switch BAT IN OVP Control LDOOUT 5V LDO INCHR 1600kΩ TERM NOBAT Current Sense ISET BATS BAT POK EN Charge Control 200kΩ ABO UVLO ABI OVP Flag 200kΩ POK POK STAT + - IN BAT GND Functional Description Preconditioning Charge The AAT3698-1/-2 is a high performance battery charger IC which is designed to charge single-cell Lithium-Ion or Polymer batteries with up to 1.6A of current from an external power source. It is a stand-alone charging solution requiring minimum input components. The AAT36981/-2 also includes a fast turn-off over-voltage protection (OVP) circuit with +28V which consists of a low-resistance MOSFET in series with the charge control circuit. The AAT3698-1/-2 also features under-voltage lockout protection, power OK, charge status monitoring, and a 5.0V LDO with 50mA output through the OVP switch. Battery charging commences only after the AAT3698-1/2 checks several conditions in order to maintain a safe charging environment. The input supply must be above the minimum operating voltage (VMIN) 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 AAT3698-1/-2 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 AAT3698-1/-2 begins preconditioning the cell (trickle charging) by charging at 10% of the programmed constant current. For example, if the programmed fast charge current is 1000mA, then the preconditioning (trickle) charge current is 100mA. 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 Profile Figure 1 illustrates the entire battery charging operation profile, which consists of three (AAT3698-2) or four (AAT3698-1) phases: 1. 2. 3. 4. Preconditioning (Trickle) Charge Constant Current Charge (CC) Constant Voltage Charge (CV) Automatic Recharge (AAT3698-1 only) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 11 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Constant Current Fast Charge Battery cell preconditioning charge continues until the battery voltage reaches the preconditioning voltage threshold (VMIN). At this point, the AAT3698-1/-2 begins the constant current charge phase. The current level for this mode is programmed using a single resistor from the ISET pin to ground. The programmed current can be set from a minimum of 100mA up to a maximum of 1.6A. Constant Voltage Charge Constant current charging will continue until the battery voltage reaches the constant output voltage, VCO. The AAT3698-1/AAT3698-2 then transitions to constant voltage mode, in which the charge IC regulates the battery voltage to a constant output voltage (factory programmed to 4.2V). The charging current decreases during this phase. The charger regulates battery voltage at 4.2V and continues to charge the battery until the charge current reaches the termination level set by RTERM. When the charge current reaches its termination level ITERM, charging is terminated. AAT3698-1 The charger turns off the series pass device even if the EN pin is held low and the device automatically enters a power-saving sleep state. During this time, the series pass device blocks current in both directions, preventing the battery from discharging through the IC. The device remains in sleep mode even if the charger source is disconnected. When the battery terminal voltage drops below the VRCH threshold, the AAT3698-1 resumes charging operation if no fault is detected. AAT3698-2 The charger regulates the battery voltage at 4.2V and continues to charge the battery with a current lower than the charge termination current until a logic high is applied to the EN pin to stop charging. V CO(REG) ICH _CC V MIN Battery Voltage ICH _TRK I CH _TERM Charger Turns OFF when I CH_CC = I CH_TERM (AAT3698-1) Battery Current STAT Preconditioning Charge Constant Current Charge STAT Turns OFF Charger Turns OFF when EN = high (AAT3698-2) Constant Voltage Charge EN Figure 1: AAT3698-1/-2 Battery Charging Profile. 12 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Enable / Disable Power Fail STAT = POK = high POK = high POK = low Charger Off Any States STAT = high, POK = low EN = high or VIN ≤ VBAT or VBOVP ≤ VBAT EN = low & VIN ≥ VBAT ≤ VBOVP Charge Complete Pre-Charge STAT = high, POK = low Charge Off for AAT3698-1 Charge On for AAT3698-2 STAT = POK = low VBAT < VMIN VBAT < VRCH (AAT3698-1 only) VBAT ≥ VMIN Fast Charge VBAT ≥ VCO(REG) STAT = POK = low IBAT = ITERM Voltage Mode Charge STAT = POK = low TLOOP TLOOP Figure 2: Charger Operational State Diagram. Charge Status Output The AAT3698-1/-2 provides battery charging status via the charge status indication pin (STAT). This pin is internally connected to an N-channel open-drain MOSFET, which can be used as a logic signal or to drive an external LED. The STAT pin pulls high to indicate charge completion. The charge completion occurs only when the EN pin is pulled high or the charge current reaches its charge termination current level. The status pin indicates the conditions as described in Table 1. Charge Status VIN > VUVLO VIN > VOVP The charge current is below its termination level EN pin is pulled high Battery is charging and the charge current is above its termination level. Table 1: LED Status Indicator. STAT High High High High Low The AAT3698-1/-2 provides an enable function to turn the charger IC on and off. The enable (EN) pin is internally pulled down with 200kΩ. When EN is pulled down or left floating, the device begins normal operation. When EN is pulled to a logic high level, the AAT3698-1/-2's charging circuit will be shut down and forced into sleep state. The over-voltage protection/LDO circuit remains active even in sleep state. In sleep state, charging is halted regardless of the battery voltage or charging state. When the device is re-enabled, the charge control circuit automatically resets and resumes charging functions with the appropriate charging mode based on the battery charge state and measured cell voltage at the BAT pin. Under-Voltage Lockout (UVLO) The AAT3698-1/-2 has a typical under-voltage lockout threshold of 3V. When the input voltage is less than the UVLO level, OVP and the charger are turned off. The UVLO is designed with 150mV hysteresis to ensure circuit stability. Over-Voltage Protection In normal operation, the OVP protection device 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, VOVP, the switch immediately turns off and disconnects the load and the charger from the power source and preventing damage to any downstream components. Simultaneously, the fault flag is raised, alerting the system. If an over-voltage condition is applied at the time of the device enable, the switch remains open (OFF). Power OK Output Flag The Power OK flag (POK) is an active-low open-drain power good reporting output. A pull-up resistor should be connected from POK to another system power voltage. In the event of an under-voltage or over-voltage condition, POK will be de-asserted. After the over-voltage fault is released, POK will be asserted. POK will be also de-asserted when VIN is lower than VBAT when EN is low. When EN is high, POK is asserted only after UVLO and OVP conditions. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 13 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Power Status VIN < VBAT VUVLO ≤ VBAT POK VIN < VUVLO VIN > VOVP + VIN_BAT_OS, EN = low + VIN_BAT_OS ≤ VIN ≤ VOVP High High High Low protection threshold (VBOVP). If an over-voltage condition is sensed by the BATS pin, the AAT3698-1/-2 charge control shuts down the device until the voltage at the BAT pin drops below VBOVP. The AAT3698-1/-2 resumes normal charging operation after the over-voltage condition is removed. Table 2: POK Flag Indicator. Digital Thermal Loop Control Automatic Booting An auxiliary OR gate provides a booting enable signal from two inputs, an internal power OK signal and an external ABI signal. The ABO states are listed in Table 3. VBAT POK ABI ABO Yes Yes Yes No Low High High X X High Low X High High Low Low Table 3: Automatic Booting. Battery Detection When the NOBAT pin is set to logic high level, the charger is disabled. When it is set to logic low level, the charger is enabled. This pin is internally pulled to the LDOOUT pin through a 1.6MΩ resistor. The AAT3698-1/-2 includes a thermal management system. The system is activated when the die temperature reaches its preset internal temperature threshold (110°C) and maintains the die temperature by reducing the constant charge current. Over-Temperature Shutdown The AAT3698-1/-2 has a thermal protection control circuit which shuts down charging functions if the internal die temperature exceeds the preset thermal limit threshold (140°C). Once the internal die temperature falls below the thermal limit, normal operation resumes in the previous charging state. Linear Dropout Regulator The AAT3698-1/-2's linear dropout regulator output (LDOOUT) provides 5V output with 30mA typical load current capabilities. Battery Over-Voltage Protection IC Input 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 The AAT3698-1/-2 has an IC input pin that is internally connected to ground through a 100kΩ resistor. Float or ground this pin for normal operation. 14 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 DATA SHEET AAT3698 Application Information Constant Charge Current The constant current charge level is user programmed with a set resistor connected between the ISET pin and ground. The tolerance of the set resistor determines the accuracy of the constant charge current as well as the preconditioning trickle charge current. For this reason, a 1% tolerance metal film resistor is recommended for the set resistor function. The constant charge current level from 100mA to 1.6A is set by selecting the appropriate resistor value from Table 4. Constant Charging Current (mA) 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package VISET · KISET = VISET · GMOUT RISET Where: GMOUT = ICH_CC_TYP KISET = = 250ms VISET RSET 1000 100 10 1 0.1 50 100 200 400 500 600 800 1000 1580 31.6 15.8 7.87 3.92 3.16 2.67 1.96 1.58 1.00 Table 4: RSET Values Figure 3 shows the relationship of constant charging current and set resistor values for the AAT3698-1/-2. 100 Charge Termination Current The charge termination current level is programmed by an external resistor (RTERM) connected between the TERM pin and ground. Use the resistor values listed in Table 5 to set the desired charge termination current. RTERM (KΩ) ICH_TERM (%) 6.65 13.3 26.7 40.2 53.6 5% 10% 20% 30% 40% Table 5: Charge Termination Current Programming Resistor Values. 50% 40% ICH_TERM (%) Set Resistor Value (kΩ) 10 Figure 3: Constant Charging Current vs. Set Resistor Values. When RSET = 3.16kΩ and KISET = 790. Typical Constant Charge Current (mA) 1 RSET (KΩ Ω) The approximate charge current (ICH_CC_typ) can be found using the following formula: ICH_CC_TYP = 10000 30% 20% 10% 0% 0 10 20 30 40 50 60 RTERM (kΩ Ω) Figure 4: Charge Termination Current vs. RTERM. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 15 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Use the following formula to set the charge termination current, ICH_TERM. ICH_TERM = 15μA · RTERM · ICH_CC 2V ICH_TERM is set by default to 10% of ICH_CC when the TERM pin is connected to the INCHR pin. When the charge current reaches the termination current, the STAT pin will be set to high impedance, but the charge termination current will continue to flow until the EN pin is toggled high. To set charge termination current threshold to the lowest level, connect the TERM pin to ground. Battery Connection A single cell Li-Ion/Polymer battery should be connected between the BAT pin and ground. Status Indicator Display Example: RB(STAT) = 5.5V - 2.0V = 1.75kΩ 2mA Note: Red LED forward voltage (VF) is typically 2.0V @ 2mA. When connecting to the USB supply with a green LED: RB(STAT) = VUSB - VF(LED) ILED(STAT) Example: RB(STAT) = 5.0V - 3.2V = 900Ω 2mA Note: Green LED forward voltage (VF) is typically 3.2V @ 2mA. Capacitor Selection Input Capacitor (IN) Simple system charging status can be displayed using a single LED in conjunction with the AAT3698-1/-2's STAT pin. 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 INCHR or other system power supply that does not exceed 7V, 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 lowcost green or red LEDs. Driving an individual status LED with over 8mA is not recommended. A 1μF 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. The required ballast resistor value can be estimated using the following formulas: Charger Input Capacitor (INCHR) When connecting to the adapter supply with a red LED: RB(STAT) = 16 VADP - VF(LED) ILED(STAT) Typically, 50V rated capacitors are required for the application to prevent any surge voltage. Ceramic capacitors selected as small as 1206 are available which can meet these requirements. Capacitors with other voltage rating can also be used for known input voltage applications. A 1μF decoupling capacitor is recommended to be placed between INCHR and GND. This capacitor should be located as closely and routed as directly as practically possible to the device's INCHR pin with a good ground return path for maximum device over-voltage protection performance. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Charger Output Capacitor (BAT) The AAT3698-1/-2 only requires a 1μF ceramic capacitor on the BAT pin to maintain circuit stability. This value should be increased to 10μF or more if the battery connection is made at any distance from the charger output. If the AAT3698-1/-2 is used in applications where the battery can be removed from the charger, such as desktop charging cradles, an output capacitor greater than 10μF may be required to prevent the device from cycling on and off when no battery is present. Linear Regulator Output Capacitor (LDOOUT) 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, multilayer ceramic capacitors in the 1.0μF to 10μF range are recommended for best performance. Applications utilizing the exceptionally low output noise and optimum power supply ripple rejection of the AAT3698-1/-2 should use a value of 2.2μF or greater 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 AAT3698-1/-2, 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 AAT3698-1/-2 TDFN33-14 package, solder the exposed paddle of the IC to 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 via holes on the thermal landing would help transfer heat to the PCB effectively. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 17 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package 18 Figure 5: AAT3698-1/-2 Evaluation Board Top Side Layout. Figure 6: AAT3698-1/-2 Evaluation Board Mid1 Layer Layout. Figure 7: AAT3698-1/-2 Evaluation Board Mid2 Layer Layout. Figure 8: AAT3698-1/-2 Evaluation Board Bottom Side Layout. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package 5V TP6 JP2 NOBAT U1 VIN GND 1 2 C1 1μF 2 IN 1 INCHR NOBAT 12 BAT 14 TP1 9 JP1 5V D1 R1 Red LED D2 TP2 EN ABI IC 11 Green LED 4 POK ISET R2 5 STAT GND TERM TP4 ABI R6 (optional) 3 LDOOUT 10 TP3 C3 1μF 7 R3 13.3k AAT3698-TDFN33-14 8 C1 C2, C3, C4 +5 R5 (optional) 6 13 LDOOUT +5 TP5 AAT3698-X ABO EN BAT BATGND ABO C2 1μF INCHR 1 2 C4 1μF R4 3.16k 1206 X7R 1μF 50V GRM31MR71H105KA88 0603 X5R 1μF 10V GRM188R61A105KE34 Figure 7: AAT3698-1/-2 Evaluation Board Schematic. Component Part Number Description Manufacturer U1 C1 C2, C3, C4 R1, R2 R3 R4 R5 R6 D1 D2 JP1, JP2 AAT3698IWO-1/-2 GRM31MR71H105KA88 GRM188R61A105KE34 Chip Resistor Chip Resistor Chip Resistor Chip Resistor Chip Resistor LST-C190CKT LST-C190GKT PRPN401PAEN 1.6A Linear Li-Ion/Polymer Battery Charger in TDFN33-14 Package Ceramic 1μF/50V, 10%, X7R, 1206 Ceramic 1μF/10V, 10%, X5R, 0603 1.5kΩ, 5%, 1/4W, 0603 13.3kΩ, 1%, 1/4W, 0603 1.58kΩ, 1%, 1/4W, 0603 10kΩ, 1%, 1/4W, 0603 0Ω, 5%, 1/4W, 0603 Red LED, 0603 Green LED, 0603 Conn. Header, 2mm zip Skyworks Murata Murata Vishay Vishay Vishay Vishay Vishay Lite-On Inc. Lite-On Inc. Sullins Electronics Table 6: AAT3698-1/-2 Evaluation Board Bill of Materials (BOM). Product Constant Regulated Output Voltage (V) Automatic Charge Termination and Recharge Sequencing when IBAT ≤ ITERM Input OVP Trip Point (V) Preconditioning Voltage Threshold (V) AAT3698-1 AAT3698-2 4.2 4.2 Yes No 7.25 7.25 2.6 2.6 Table 7: AAT3698 Options. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 19 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Ordering Information Product Package Marking1 Part Number (Tape and Reel)2 AAT3698-1 AAT3698-2 TDFN33-14 TDFN33-14 A5XYY D6XYY AAT3698IWO-4.2-1-T1 AAT3698IWO-4.2-2-T1 Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. Package Information TDFN33-14 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" All dimensions in millimeters. 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. 20 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 DATA SHEET AAT3698 1.6A Linear Li-Ion Battery Charger in a 3x3 TDFN Package Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. 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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 • [email protected] • www.skyworksinc.com 201902B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012 21