ISL78693ARZ-T7A Renesas

DATASHEET ISL78693 FN8891 Rev 1.00 Automotive Single-Cell LiFePO4 Battery Charger December 12, 2016 The ISL78693 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 ISL78693 operates as a linear charger when the AC Reverse battery leakage 700nA adapter is a voltage source. The battery is charged in a 1% initial voltage accuracy Constant Current/Constant Voltage (CC/CV) profile. The charge Programmable CC current up to 1A current is programmable with an external resistor up to 1A. The ISL78693 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 ISL78693 features charge current thermal foldback to Accepts CV and CC types of adapters or USB bus power ensure safe operation when the printed circuit boards thermal Preconditioning trickle charge dissipation is limited due to space constraints. Additional features include preconditioning of an over-discharged battery, Guaranteed to operate down to 2.65V after start-up an NTC thermistor interface for charging the battery in a safe Ambient temperature range: -40C to +85C temperature range, and automatic recharge. The device is AEC-Q100 qualified specified for operation in ambient temperatures from -40C to +85C and is offered in a 3x3mm thermally enhanced DFN Applications package. Automotive systems Related Literature eCall systems For a full list of related documents, visit our website Backup battery systems - ISL78693 product page CONSTANT CONSTANT TRICKLE CURRENT VOLTAGE INHIBIT MODE MODE MODE V IN INPUT VOLTAGE V BATTERY CH ISL78693 BATTERY VOLTAGE PACK 5V VIN V BAT R 1 C C1 R 2 V 1 100k TRICKLE + TEMP 2x10F FAULT 10F 100k - R 1 1k STATUS V2P8 I CHARGE IREF EN R 1 EN 160k C3 TIME GND 1F CHARGE CURRENT CTIME 15nF I /10 CHARGE TIMEOUT FIGURE 2. TYPICAL CHARGE CURVES USING A CONSTANT FIGURE 1. TYPICAL APPLICATION VOLTAGE ADAPTER FN8891 Rev 1.00 Page 1 of 18 December 12, 2016- ISL78693 Block Diagram Q MAIN V IN VBAT C 1 REFERENCES V2P8 TEMPERATURE Q SEN MONITORING 100000:1 CURRENT MIRROR I T V V I IN BAT SEN INPUT OK + - VPOR + IREF I + + R 100mV - R IREF - CURRENT CHRG REFERENCES + I MIN V - CH + V TRICKLE/FAST MIN - MINBAT I SEN + V RECHRG MIN I + - - V2P8 RECHARGE UNDER- STATUS TEMPERATURE LOGIC STATUS OVER- NTC TEMPERATURE TEMP INTERFACE BATT REMOVAL FAULT FAULT V2P8 TIME OSC COUNTER INPUT OK GND EN FIGURE 3. BLOCK DIAGRAM 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 FN8891 Rev 1.00 Page 2 of 18 December 12, 2016 VPOR V CH V MIN V RECHRG