Li-ion Battery Charger

® ISL9205 Data Sheet March 20, 2007 FN9252.0 Li-ion Battery Charger The ISL9205 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 ISL9205 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 ISL9205 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 ISL9205 operates in a linear mode during the constant voltage phase in both adapter cases. The ISL9205 incorporates ThermaguardTM which protects the IC against over temperature. If the die temperature rises above a typical value of +100°C, the thermal foldback function reduces the charge current to prevent further temperature rise. The ISL9205 includes an external temperature monitoring function (not available in some package options). A negative temperature coefficient (NTC) thermistor is connected between the TEMP pin and GND to monitor the battery or ambient temperature. The ISL9205 also includes a timer to set the time reference for various charge time limits. The timer is programmable with an external capacitor. A logic input and two open-drain logic outputs are available for controlling the charger and indicating the charger status. The EN pin enables the charger. The ISL9205B, ISL9205C, and ISL9205D incorporate a a timeout function so that the charge is terminated when the preset time limits have been reached. The FAULT pin is an open-drain output which turns on when a fault condition is encountered. The STATUS pin is also an open-drain output which turns on when the charger is delivering current. 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 • 15mV 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 Indications • NTC Interface (ISL9205D) • Less than 3µA Leakage Current off the Battery when No Input Power Attached or Charger Disabled • Ambient Temperature Range: -40°C to +85°C • DFN Packages • Pb-free plus anneal available (RoHS compliant) Applications • Mobile Phones • Blue-Tooth Devices • PDAs • MP3 Players • Stand-Alone Cradle or Travel Chargers • Other Handheld Devices 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. Thermaguard is a trademark of Intersil Americas Inc. All other trademarks mentioned are the property of their respective owners. ISL9205 Ordering Information PART NUMBER (NOTE) ISL9205AIRZ ISL9205AIRZ-T ISL9205BIRZ ISL9205BIRZ-T ISL9205CIRZ ISL9205CIRZ-T ISL9205DIRZ ISL9205DIRZ-T PART MARKING DLCA DLCA DLDA DLDA DLEA DLEA DLFA DLFA TEMP. RANGE (°C) -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 -40 to +85 VBAT (V) 4.2 4.2 4.2 4.2 4.256 4.256 4.2 4.2 VSEN YES YES YES YES YES YES NO NO TEMP NO NO NO NO NO NO YES YES TIMEOUT NO NO YES YES YES YES YES YES PACKAGE (Pb-free) PKG DWG. # 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 10 Ld 3x3 DFN L10.3x3 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. 2 FN9252.0 March 20, 2007 ISL9205 Pin Description VIN (Pin 1) VIN is the input power source. Connect to a wall adapter. EN (Pin 6) EN is the enable logic input. Connect the EN pin to LOW to disable the charger or leave it floating to enable the charger. There is an internal 400kΩ pull-up resistor at this pin. FAULT (Pin 2) FAULT is an open-drain output indicating fault status. This pin is pulled to LOW under any fault condition. When a fault condition occurs, the time counter will be reset. When the charger is disabled, the FAULT pin outputs high impedance. 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 zero otherwise. The V2P8 pin can be used as an indication for adapter presence. 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. 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) 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. Where RIREF is in kΩ. TEMP (Pin 9 for ISL9205D; N/A for ISL9205A, ISL9205B, and ISL9205C) TEMP is the input for an external NTC thermistor. The TEMP pin is also used for battery removal detection. GND (Pin 5) GND is the connection to system ground. VSEN (Pin 9 for ISL9205A,ISL9205B, and ISL9205C; N/A for ISL9205D) 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. 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. 3 FN9252.0 March 20, 2007 ISL9205 Pinouts ISL9205A, ISL9205B, ISL9205C (10 LD DFN TOP VIEW) VIN VIN FAULT STATUS TIME GND 1 2 3 4 5 10 VBAT 9 8 7 6 VSEN IREF V2P8 EN FAULT STATUS TIME GND 1 2 3 4 5 ISL9205D (10 LD DFN) TOP VIEW 10 VBAT 9 8 7 6 TEMP IREF V2P8 EN Typical Applications ISL9205A, ISL9205B AND ISL9205C 5V WALL ADAPTER VIN 1 mF C1 1Ω R3 1 kΩ R1 1 kΩ R2 ISL9205A ISL9205B ISL9205C D1 D2 VSEN FAULT STATUS EN EN DIS 1µF C3 V2P8 TIME CTIME 15nF IREF IMIN RIREF 80kΩ VBAT 1µF C2 + BATTERY PACK GND ISL9205D 5V WALL ADAPTER VIN 1µF C1 1Ω R3 VBAT 1µF 1 kΩ R1 1 kΩ R2 ISL9205D RU D1 D2 TEMP FAULT STATUS EN EN DIS V2P8 TIME 1µF C3 CTIME 15nF GND IREF IMIN RIREF 80kΩ RT T C2 V2P8 + - BATTERY PACK 4 FN9252.0 March 20, 2007 ISL9205 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), (Note 2) . . 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. The 150C maximum junction temperature is for information purposes only. In reality, the current foldback feature will prevent the junction from rising above a worst case temperature of 125C. 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. 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 the Ambient Temperature at +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 (Except ISL9205C) 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