Part Number: HT4921
Function: Mobile Power Management IC
Package: ESOP 8 Pin Type
HT4921 is a highly integrated single-cell mobile power management chip. It integrates a charge management module, an LED indicator module, and a boost discharge management module, completely replacing the current charge management IC+MCU+boost IC solution on the market.
1. Highly integrated, very few peripheral components;
2. Linear charging mode, built-in 1A MOSFET, supports 0V battery charging, trickle/constant current/constant voltage three-stage charging.
3. The charging current is externally adjustable.
4. The built-in charging current will decrease as the temperature increases, and it will start to decrease at 130 degrees, and the lowest can be reduced to 0.
5. Anti-backflow protection during discharge.
6. Support single light mode and dual light mode;
7. 4KV ESD
8. Fixed switching frequency 1MHZ
9. Battery overcharge and overdischarge protection
10. Automatic boost when load is inserted, automatic sleep when load is removed
Pin discriptions :
1. GND Chip ground
2. L2 charge and discharge indicator
3. L1 charging indicator
4. VDD External input DC 5V
5. BTP battery terminal
6. PROG Charge current adjustment terminal
7. VOUT Output Voltage Pin
8. LX switch pin