Li-ion/Li Polymer Battery Charger

® ISL9203A Data Sheet February 14, 2007 FN6430.0 Li-ion/Li Polymer Battery Charger The ISL9203A is an integrated single-cell Li-ion or Li-polymer battery charger capable of operating with an input voltage as low as 2.4V. This charger is designed to work with various types of AC adapters. The ISL9203A operates as a linear charger when the AC adapter is a voltage source. The battery is charged in a CC/CV (constant current/constant voltage) profile. The charge current is programmable with an external resistor up to 1.5A. The ISL9203A can also work with a current-limited adapter to minimize the thermal dissipation, in which case the ISL9203A combines the benefits of both a linear charger and a pulse charger. The ISL9203A features charge current thermal foldback to guarantee safe operation when the printed circuit board is space limited for thermal dissipation. Additional features include preconditioning of an over-discharged battery and thermally enhanced DFN package. Features • Complete Charger for Single-Cell Li-ion Batteries • Very Low Thermal Dissipation • Integrated Pass Element and Current Sensor • No External Blocking Diode Required • 1% Voltage Accuracy • Programmable Current Limit up to 1.5A • Charge Current Thermal Foldback • Accepts Multiple Types of Adapters • Guaranteed operation down to VIN = 2.65V after start up • Ambient Temperature Range: -20°C to +70°C • Thermally-Enhanced DFN Packages • Pb-Free Plus Anneal Available (RoHS Compliant) Applications • Handheld Devices including Medical Handhelds • PDAs, Cell Phones and Smart Phones • Portable Instruments, MP3 Players Typical Application Circuit 5V INPUT C1 R1 VIN VBAT C2 • Self-Charging Battery Packs • Stand-Alone Chargers • USB Bus-Powered Chargers ISL9203A VSEN STATUS V2P8 EN TIME IREF GND R IREF C3 FLOATING TO ENABLE Related Literature • Technical Brief TB363 “Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs)” • Technical Brief TB379 “Thermal Characterization of Packaged Semiconductor Devices” • Technical Brief TB389 “PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages” CTIME Ordering Information PART NUMBER PART (Note) MARKING ISL9203ACRZ 03ACZ TEMP. RANGE (°C) -20 to +70 PACKAGE (Pb-free) PKG DWG. # Pinout ISL9203A (10 LD 3x3 DFN) TOP VIEW 10 Ld 3x3 DFN L10.3x3 VIN NC STATUS TIME GND 1 2 3 4 5 10 VBAT 9 8 7 6 VSEN IREF V2P8 EN ISL9203ACRZ-T 10 Ld 3x3 DFN Tape and Reel NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2007. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. ISL9203A Absolute Maximum Ratings Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 7V Output Pin Voltage (BAT, VSEN, V2P8). . . . . . . . . . . . -0.3V to 5.5V Signal Input Voltage (TIME, IREF). . . . . . . . . . . . . . . . -0.3V to 3.2V Output Pin Voltage (STATUS) . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6A ESD Rating Human Body Model (Per MIL-STD-883 Method 3015.7) . . .4500V Machine Model (Per EIAJ ED-4701 Method C-111) . . . . . . . .200V Thermal Information Thermal Resistance (Typical, Notes 1, 2) θJA (°C/W) θJC (°C/W) 3x3 DFN Package . . . . . . . . . . . . . . . . 46 4 Maximum Junction Temperature (Plastic Package) . . . . . . . +150°C Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . +300°C Recommended Operating Conditions Ambient Temperature Range . . . . . . . . . . . . . . . . . . .-20°C to +70°C Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3V to 6.5V CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. +150°C max junction temperature is intended for short periods of time to prevent shortening the lifetime. Operation close to +150°C junction may trigger the shutdown of the device even before +150°C, since this number is specified as typical. NOTES: 1. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech Brief TB379. 2. θJC, “case temperature” location is at the center of the exposed metal pad on the package underside. See Tech Brief TB379. Electrical Specifications Typical values are tested at VIN = 5V and +25°C Ambient Temperature, maximum and minimum values are guaranteed over 0°C to +70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless otherwise noted. SYMBOL TEST CONDITIONS MIN TYP MAX UNITS PARAMETER POWER-ON RESET Rising VIN Threshold Falling VIN Threshold STANDBY CURRENT VBAT Pin Sink Current VIN Pin Supply Current VIN Pin Supply Current VOLTAGE REGULATION Output Voltage Dropout Voltage CHARGE CURRENT Constant Charge Current (Note 3) Constant Charge Current Trickle Charge Current Trickle Charge Current End-of-Charge Threshold End-of-Charge Threshold RECHARGE THRESHOLD Recharge Voltage Threshold 3.0 2.3 3.4 2.4 4.0 2.65 V V ISTANDBY IVIN IVIN VIN floating or EN = LOW VBAT floating and EN pulled low VBAT floating and EN floating - 30 1 3.0 250 2 µA µA mA VCH VBAT = 3.7V, Charge current = 1A 4.158 - 4.20 320 4.242 550 V mV ICHARGE ICHARGE ITRICKLE ITRICKLE IMIN IMIN RIREF = 80kΩ, VBAT = 3.7V RIREF = 1.21MΩ, VBAT = 3.7V RIREF = 80kΩ, VBAT = 2.0V RIREF = 1.21MΩ, VBAT = 2.0V RIREF = 80kΩ RIREF = 1.21MΩ 0.9 33 85 2 85 2 1.0 66 110 7 110 - 1.1 100 135 15 135 30 A mA mA mA mA mA VRECHRG 3.85 4.00 4.10 V 2 FN6430.0 February 14, 2007 ISL9203A Electrical Specifications Typical values are tested at VIN = 5V and +25°C Ambient Temperature, maximum and minimum values are guaranteed over 0°C to +70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless otherwise noted. (Continued) SYMBOL TEST CONDITIONS MIN TYP MAX UNITS PARAMETER TRICKLE CHARGE THRESHOLD Trickle Charge Threshold Voltage V2P8 PIN VOLTAGE V2P8-Pin Voltage TEMPERATURE MONITORING Charge Current Foldback Threshold (Note 4) Current Foldback Gain (Note 4) OSCILLATOR Oscillation Period LOGIC OUTPUTS STATUS Logic Low Sink Current STATUS Leakage Current EN Input Logic High EN Input Logic Low EN Pin Current When Driven Low NOTES: VMIN 2.1 2.3 2.5 V VV2P8 2.7 2.9 3.1 V TFOLD GFOLD - 100 100 - °C mA/°C TOSC CTIME = 15nF 2.4 3.0 3.6 ms Pin Voltage = 0.8V VVIN = VSTATUS = 5V 5 2.0 - - 1 3.3 0.8 100 mA µA V V µA 3. The accuracy includes all errors except the programming resistance tolerance. The actual charge current may be affected by the thermal foldback function if the thermal dissipation capability is not enough or by the on resistance of the power MOSFET if the charger input voltage is too close to the output voltage. 4. Guaranteed by characterization. Typical Operating Performance 4.2015 4.2010 4.2005 VBAT (V) 4.2000 The test conditions for the Typical Operating Performance are: VIN = 5V, TA = +25°C, RIREF = RIMIN = 80kΩ, VBAT = 3.7V, unless otherwise noted. 4.210 4.208 RIREF = 40kΩ VBAT (V) 4.206 4.204 4.202 4.200 4.198 4.196 CHARGE CURRENT = 50mA 4.1995 4.1990 4.1985 4.1980 4.1975 0 0.3 0.6 0.9 1.2 1.5 CHARGE CURRENT (A) 4.194 4.192 4.190 0 20 40 60 80 100 120 TEMPERATURE (°C) FIGURE 1. CHARGER OUTPUT VOLTAGE vs CHARGE CURRENT FIGURE 2. CHARGER OUTPUT VOLTAGE vs TEMPERATURE 3 FN6430.0 February 14, 2007 ISL9203A Typical Operating Performance The test conditions for the Typical Operating Performance are: VIN = 5V, TA = +25°C, RIREF = RIMIN = 80kΩ, VBAT = 3.7V, unless otherwise noted. (Continued) 2.0 4.30 1.8 CHARGE CURRENT = 50mA 4.25 VBAT (V) CHARGE CURRENT (A) 1.6 1.4 1.5A 1.2 1.0 0.8 0.6 0.4 0.2 4.10 4.2 4.5 4.8 5.1 5.4 VIN (V) 5.7 6 6.3 0.0 3.0 3.2 3.4 3.6 VVBAT (V) 3.8 4.0 0.5A 1A 2A 4.20 4.15 FIGURE 3. CHARGER OUTPUT VOLTAGE vs INPUT VOLTAGE CHARGE CURRENT IS 50mA FIGURE 4. CHARGE CURRENT vs OUTPUT VOLTAGE 1.6 1.4 CHARGE CURRENT (A) 1.2 1.0 1.0A 0.8 0.6 0.4 0.2 0.0 0 20 40 60 80 100 120 TEMPERATURE (°C) 0.5A 1.5A 2.0 1.8 CHARGE CURRENT (A) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 4.3 4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1 6.3 6.5 VIN (V) 0.5A 1A 1.5A FIGURE 5. CHARGE CURRENT vs AMBIENT TEMPERATURE FIGURE 6. CHARGE CURRENT vs INPUT VOLTAGE 2.930 3.00 2.95 2.928 V2P8 VOLTAGE (V) V2P8 PIN LOADED WITH 2mA V2P8 VOLTAGE (V) 4.0 4.5 5.0 VIN (V) 5.5 6.0 6.5 2.90 2.85 2.926 2.924 2.80 2.922 2.75 2.920 3.5 2.70 0 2 4 6 8 10 V2P8 LOAD CURRENT (mA) FIGURE 7. V2P8 OUTPUT vs INPUT VOLTAGE FIGURE 8. V2P8 OUTPUT vs ITS LOAD CURRENT 4 FN6430.0 February 14, 2007 ISL9203A Typical Operating Performance The test conditions for the Typical Operating Performance are: VIN = 5V, TA = +25°C, RIREF = RIMIN = 80kΩ, VBAT = 3.7V, unless otherwise noted. (Continued) 700 650 600 rDS(ON) (mΩ) 550 500 450 400 350 300 250 200 0 20 40 60 80 100 120 TEMPERATURE (°C) 280 260 3.0 3.2 3.4 3.6 VBAT (V) 3.8 4.0 THERMAL FOLDBACK STARTS NEAR +100°C rDS(ON) (mΩ) 420 400 380 360 340 320 300 500mA CHARGE CURREN