LT3651-8.2/LT3651-8.4
Monolithic 4A High Voltage
2-Cell Li-Ion Battery Charger
FEATURES DESCRIPTION Wide Input Voltage Range: 9V to 32V (40V Absolute Maximum)
n Programmable Charge Current Up to 4A
n Selectable C/10 or Onboard Timer Terminatio Dynamic Charge Rate Programming/Soft-Start
n Programmable Input Current Limit
n ±0.5% Float Voltage Accuracy
n ±7.5% Charge Current Accuracy
n ±4% C/10 Detection Accuracy
n NTC Resistor Temperature Monitor
n Auto-Recharge at 97.5% Float Voltage
n Auto-Precondition at 1.1V l 88 95 103 V/V
mV C/10 Trigger Sense Voltage VSENSE – VBAT l 4.5 8.6 12.3 mV BAT Input Bias Current Charging Terminated 0.1 1 µA SENSE Input Bias Current Charging Terminated 0.1 1 µA l 44 50 56 µA Charge Current Limit Programming Gain VRNG/SS/(VSENSE – VBAT), VRNG/SS = 0.5V l 8.5 10.8 12.5 V/V NTC Range Limit (High) VNTC Rising l 1.25 1.36 1.45 V NTC Range Limit (Low) VNTC Falling l 0.27 0.29 0.31 NTC Threshold Hysteresis % of Threshold NTC Disable Impedance Minimum External Impedance to GND l 150 NTC Bias Current VNTC = 0.75V l 46.5 50 53.5 µA Shutdown Threshold VSHDN Rising l 1.15 1.20 1.23 V RNG/SS Bias Current V 10 % 470 kΩ Shutdown Hysteresis 95 mV SHDN Input Bias Current –10 nA Status Low Voltage VCHRG, VFAULT , VACPR, Load = 10mA l 0.45 V 36518284fa For more information www.linear.com/LT3651-8.2 3 LT3651-8.2/LT3651-8.4
ELECTRICAL
CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 20V, SHDN = 2V, SENSE = BAT = VBAT(FLT),
CTIMER = 0.68µF, RT = 50k, CLP = CLN = VIN, BOOST – SW = 4V. PARAMETER CONDITIONS MIN TYP
25 µA 0.1 0.25 V TIMER Charge/Discharge Current
TIMER Disable Threshold l Full Charge Cycle Time-Out 3 Precondition Timeout
l RT = 50kΩ
RT = 250kΩ Minimum SW On-Time, tON(MIN)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings …