Li-ion Battery Charger

® ISL9201 Data Sheet February 22, 2007 FN6429.1 Li-ion Battery Charger The ISL9201 is an integrated single-cell Li-ion or Li-polymer charger capable of operating at an input voltage as low as 2.5V. The low operating voltage allows the charger to work with a variety of AC adapters. The ISL9201 operates as a linear charger when the AC adapter is a voltage source. The battery is charged in a standard Li-ion charge profile, i.e. a constant current phase followed be a constant voltage phase (CC/CV). The charge current during the constant current phase is determined by the external resistor connected to the IREF pin. When the adapter output is a current-limited voltage source and the current limit is smaller than the programmed constant current of the IC, the ISL9201 operates as a pulse charger where the charge current is determined by the current limit of the AC adapter during the constant current phase. The ISL9201 operates in a linear mode during the constant voltage phase in both adapter cases. Features • Complete Charger for Single-Cell Li-ion/Polymer Batteries • Integrated Pass Element and Current Sensor • No External Blocking Diode Required • Low Component Count and Cost • 25mV Voltage Accuracy Over-Temperature and Input Voltage Range • 20mV Voltage Accuracy at Room Temperature • Programmable Charge Current • Charge Current Thermal Foldback for Thermal Protection (ThermaguardTM) • Trickle Charge for Fully Discharged Batteries • Power Presence and Charge/EOC Indications • Less than 4µA Leakage Current off the Battery when No Input Power Attached or Charger Disabled • Ambient Temperature Range: -40°C to +85°C • DFN Package • Pb-Free Plus Anneal Available (RoHS Compliant) Preliminary The ISL9201 incorporates ThermaguardTM, which protects the IC against over-temperature. If the die temperature rises above a typical value of +110 °C, the thermal foldback function reduces the charge current to prevent further temperature rise. The ISL9201 also includes a timer to set the time reference for the delay time of the end-of-charge (EOC) and recharge indications. The timer is programmable with an external capacitor. A logic input and an open-drain logic output are available for controlling the charger and indicating the charger status. The EN pin enables the charger. The STATUS pin is an open-drain output which turns on when the charger is delivering current. The charger uses a 10 Ld 3x3 DFN package to maximize thermal conductivity. Applications • Mobile Phones • Blue-Tooth Devices • PDAs • MP3 Players • Stand-Alone Cradle or Travel Chargers • Other Handheld Devices Ordering Information PART NUMBER ISL9201IRZ PART TEMP. MARKING RANGE (°C) DLGA -40 to +85 PACKAGE (Pb-free) PKG DWG. # Pinout ISL9201 (10 LD DFN) TOP VIEW VIN GND STATUS TIME GND 1 2 3 4 5 10 9 8 7 6 VBAT VSEN IREF V2P8 EN 10 Ld 3x3 DFN L10.3x3 ISL9201IRZ-T DLGA -40 to +85 10 Ld 3x3 DFN L10.3x3 Tape & 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. ISL9201 Typical Applications 5V WALL ADAPTER 1µF C1 R1 1Ω 1kΩ R1 D1 VIN VBAT 1µF C2 ISL9201IRZ BATTERY PACK VSEN IREF STATUS EN V2P8 TIME 4.7µF C3 CTIME 15nF GND RIREF 100kΩ Pin Description VIN (Pin 1) VIN is the input power source. Connect to a wall adapter. V2P8 (Pin 7) This is a 2.8V reference voltage output. This pin provides a 2.8V voltage source when the input voltage is above the POR threshold and outputs 0V otherwise. The V2P8 pin can be used as an indication for adapter presence. GND (Pin 2) GND is the connection to system ground. IREF (Pin 8) This is the charge current programming and monitoring pin. Connect a resistor between this pin and GND to set the charge current during the constant current phase, as given by Equation 1: 80 I REF = ---------------R IREF (A) (EQ. 1) STATUS (Pin 3) STATUS is an open-drain output indicating charging and inhibit states. The STATUS pin is pulled LOW when the charger is charging a battery. It will be turned into high impedance when the charge current drops to IMIN. This high impedance state will be latched until a recharge cycle or a new charge cycle starts. When the charger is disabled, the STATUS pin outputs high impedance. Where RIREF is in kΩ. TIME (Pin 4) The TIME pin determines the oscillation period by connecting a timing capacitor between this pin and GND. The oscillator also provides a time reference for the charger. VSEN (Pin 9) VSEN is the remote voltage sense pin. Connect this pin as close to the battery positive terminal as possible. If the VSEN pin is left floating, its voltage drops to 0V and the charger operates in trickle mode. GND (Pin 5) GND is the connection to system ground. VBAT (Pin 10) VBAT is the connection to the battery. Typically a 10µF Tantalum capacitor is needed for stability when there is no battery attached. When a battery is attached, only a 0.1µF ceramic capacitor is required. EN (Pin 6) EN is the enable logic input. Connect the EN pin to HIGH to disable the charger. Connect the EN pin to LOW or leave it floating to enable the charger. There is an internal 400kΩ pull-down resistor at this pin. 2 FN6429.1 February 22, 2007 ISL9201 Absolute Maximum Ratings Voltage Ratings for All Pins . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0A ESD Rating Human Body Model (Per EIA JESD22 Method A114-B) . . . . .2kV Machine Model (Per EIA JED-4701 Method C-111) . . . . . . . 200V Thermal Information Thermal Resistance θJA (°C/W) θJC (°C/W) 3x3 DFN Package (Note 1) . . . . . . . . . 48 6 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 . . . . . . . . . . . . . . . . . . .-40°C to +85°C Operating Supply Voltage (VIN Pin). . . . . . . . . . . . . . . 4.25V to 6.5V Programmed Charge Current . . . . . . . . . . . . . . . . . 50mA to 900mA 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 for information purposes only. In reality, the current foldback feature will prevent the junction from rising above the typical temperature of +110°C. 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. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside. Electrical Specifications Typical Values Are Tested at VIN = 5V and TA = +25°C. All Maximum and Minimum Values Are Guaranteed Under the Recommended Operating Supply Voltage Range and Ambient Temperature Range, Unless Otherwise Noted. SYMBOL TEST CONDITIONS MIN TYP MAX UNITS PARAMETER POWER-ON RESET Rising POR Threshold Falling POR Threshold VIN-BAT OFFSET VOLTAGE Rising Edge STANDBY CURRENT BAT Pin Sink Current VIN Pin Supply Current VIN Pin Supply Current VOLTAGE REGULATION Output Voltage Output Voltage PMOS On Resistance CHARGE CURRENT (Note 4) Constant Charge Current VPOR VPOR VBAT = 3.0V, use V2P8 pin to indicate the comparator output. 3.2 2.25 3.6 2.5 3.9 2.7 V V VOS VBAT = 4.2V, IBAT = 20mA, use STATUS pin to indicate the comparator output (Note 3) 45 80 100 mV ISTANDBY Charger disabled or the input is floating IVIN IVIN Charger disabled Charger enabled - 150 1.0 3.3 250 - µA µA mA VCH VCH rDS(ON) Tested at 50mA load, 5V input and +25°C -40°C < TA < +85°C, 4.3V < VIN < 6.5V VBAT = 4.0V, charge current = 0.35A 4.180 4.175 - 4.20 4.20 500 4.220 4.225 - V V mΩ ICC VIN = 5V, RIREF = 887kΩ, VBAT = 3.0V to 4.0V VIN = 5V, RIREF = 100kΩ, VBAT = 3.0V to 4.0V 60 725 6 64 60 90 800 10 80 80 120 840 14 96 105 mA mA mA mA mA Trickle Charge Current ITRK VIN = 5V, RIREF = 800kΩ, VBAT = 0V to 2.5V VIN = 5V, RIREF = 100kΩ, VBAT = 0V to 2.5V End-of-Charge Current V2P8 PIN OUTPUT V2P8 Pin Output Voltage CHARGE THRESHOLDS Preconditioning Charge Threshold Voltage Preconditioning Voltage Hysteresis IMIN RIREF = 100kΩ VV2P8 Load current less than 1mA 2.8 2.9 3.0 V VMIN VMINHYS 2.7 50 2.8 100 2.9 150 V mV 3 FN6429.1 February 22, 2007 ISL9201 Electrical Specifications Typical Values Are Tested at VIN = 5V and TA = +25°C. All Maximum and Minimum Values Are Guaranteed Under the Recommended Operating Supply Voltage Range and Ambient Temperature Range, Unless Otherwise Noted. (Continued) SYMBOL VRCH VRCHHYS TEST CONDITIONS Referenced to the charger output voltage VCH MIN -225 TYP -150 50 MAX -70 UNITS mV mV PARAMETER Recharge Threshold Recharge Threshold Hysteresis INTERNAL TEMPERATURE MONITORING Charge Current Foldback Threshold OSCILLATOR Oscillation Period LOGIC INPUT AND OUTPUTS EN Pin Logic Input High EN Pin Logic Input Low EN Pin Internal Pull Down Resistance STATUS Output Voltage When On STATUS Leakage Current NOTE: TFOLD