ISL78692-1CR3Z Renesas

DATASHEET ISL78692 FN8692 Rev.1.00 Li-ion/Li-Polymer Battery Charger Mar 29, 2017 The ISL78692 is an integrated single-cell Li-ion or Li-polymer Features battery charger capable of operating with an input voltage Complete charger for single-cell Lithium chemistry batteries as low as 2.65V (cold crank case). This charger is designed to work with various types of AC adapters or a USB port. Integrated power transistor and current sensor The ISL78692 operates as a linear charger when the AC Reverse battery leakage 700nA adapter is a voltage source. The battery is charged in a CC/CV 1% initial voltage accuracy (constant current/constant voltage) profile. The charge current Programmable CC current up to 1A is programmable with an external resistor up to 1A. The ISL78692 can also work with a current-limited adapter to Charge current thermal foldback minimize the thermal dissipation. NTC thermistor interface for battery temperature alert The ISL78692 features charge current thermal foldback to Accepts CV and CC types of adapters or USB bus power guarantee safe operation when the printed circuit boards Preconditioning trickle charge thermal dissipation is limited due to space constraints. Additional features include preconditioning of an Guaranteed to operate down to 2.65V after start-up over-discharged battery, an NTC thermistor interface for Ambient temperature range: -40C to +85C charging the battery in a safe temperature range and AEC-Q100 qualified automatic recharge. The device is specified for operation in ambient temperatures from -40C to +85C and is offered in Applications a 3x3mm thermally enhanced DFN package. Automotive systems Related Literature eCall systems Technical Brief TB363 Guidelines for Handling and Backup battery systems Processing Moisture Sensitive Surface Mount Devices (SMDs) Technical Brief TB379 Thermal Characterization of Packaged Semiconductor Devices UG001, ISL78692EVAL1Z Evaluation Board User Guide CONSTANT CONSTANT TRICKLE CURRENT VOLTAGE INHIBIT MODE MODE MODE V BATTERY IN ISL78692 INPUT VOLTAGE PACK 5V V CH VIN V BAT BATTERY VOLTAGE R 1 C C1 2 R 1 100k + TEMP 2x10F FAULT 10F 100k - R 1 V TRICKLE 1k STATUS V2P8 IREF EN R 1 EN I 160k CHARGE C3 TIME GND 1F CTIME 15nF CHARGE CURRENT I /10 CHARGE TIMEOUT FIGURE 1. TYPICAL APPLICATION FIGURE 2. TYPICAL CHARGE CURVES USING A CONSTANT VOLTAGE ADAPTER FN8692 Rev.1.00 Page 1 of 18 Mar 29, 2017- ISL78692 Block Diagram QMAIN V IN V BAT C 1 REFERENCES V2P8 TEMPERATURE Q SEN MONITORING 100000:1 CURRENT MIRROR I T I V V SEN IN BAT INPUT OK + - V POR + IREF + + IR - 100mV RIREF - CURRENT CHRG REFERENCES + I MIN V - CH + V TRICKLE/FAST MIN - MINBAT I SEN + V RECHRG MIN I + - - V2P8 UNDER- RECHARGE STATUS TEMPERATURE LOGIC STATUS OVER- NTC TEMPERATURE TEMP INTERFACE BATT REMOVAL FAULT FAULT V2P8 TIME OSC COUNTER INPUT OK GND EN TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS OUTPUT RECHARGE TRICKLE CHARGE PART NUMBER VOLTAGE (V) THRESHOLD (V) THRESHOLD (V) ISL78692 4.1 3.9 2.8 ISL78693 3.65 3.25 2.6 FN8692 Rev.1.00 Page 2 of 18 Mar 29, 2017 V POR V CH VMIN V RECHRG