1. Specifications
Unless otherwise specified, all parameters are measured at room temperature and referenced to the GND pin as the zero potential
| Symbol | Features | Condition | Unit | Min. | Typ. | Max. |
| System Parameters | ||||||
| VIN | Input Voltage Range | V | 4.5 | 5 | 6 | |
| Vbat | Battery Voltage | V | 2.8 | 4.35 | ||
| Charging Parameters | ||||||
| VIN Power Loss Monitoring | VIN from low to high | Vin>BAT | mV | 100 | ||
| VIN from high to low | Vin>BAT | mV | 30 | |||
| Vfloat1 | Float Threshold Voltage | (4.2/4.35 Pin floating) | V | 4.18 | 4.22 | 4.26 |
| Vfloat2 | Float Threshold Voltage | (4.2/4.35 Pin grounded) | V | 4.30 | 4.35 | 4.40 |
| Ibat | BAT Reverse Leakage Current | Vcc=3.5V，Vbat=4.2V | uA | ±0.5 | ±5 | |
| VTRKL | Trickle to Constant Current Transition | VBAT from low to high | V | 2.8 | ||
| VTRHYS | Trickle Charge Hysteresis Voltage | mV | 100 | |||
| VUV | Vcc Undervoltage Lockout Threshold | VCC from low to high | V | 3.7 | ||
| VUVHYS | Vcc Undervoltage Lockout Hysteresis | mV | 200 | |||
| VRECHG | Recharging Threshold Voltage | V | 4.1 | |||
| Vprog1 | PROG Voltage at Trickle | V | 0.1 | |||
| Vprog2 | PROG Voltage at High Current | V | 1 | |||
| FLED | LED Flashing Frequency during Charging | Hz | 1 | |||
| Discharge Parameters | ||||||
| Vo | Boost System Output Voltage | V | 4.95 | 5.10 | 5.25 | |
| VOVP | Output Overvoltage Protection | V | 5.8 | |||
| VOVP_DIS | V | 5.4 | ||||
| VUVLO | Boost Undervoltage Protection | BAT from High to Low | V | 2.8 | ||
| VUVLO_R | Boost Undervoltage Recovery | BAT from Low to High | V | 3.2 | ||
| IBAT1 | Vout=5.5V, No switching | mA | 0.2 | |||
| IBAT2 | Vout=4.5V, switching | mA | 1 | |||
| FOSC | Operating Frequency | MHz | 1 | |||
| Iout | Output Current | BAT=3.6V, Vout>4.8V | V | 1.0 | ||
| Iauto_off | Automatic Shutdown Load Current | BAT=2.8-4.2V
Cout=22uF |
mA | 50 | ||
| Ibtp | Static Current | BTP=3.6V | uA | 10 | ||
| OTP | Overtemperature Protection | degC | 150 | |||
| OTP_HYS | Hysteresis | degC | 30 | |||
2. Product Features
- Integrated maximum 1A linear charging mode with externally adjustable charging current.
- Three-stage charging (trickle/constant current/constant voltage) with selectable 4.22V/4.35V, supporting charging of 0V batteries.
- The built-in charging function automatically reduces the charging current based on temperature rise, starting to decrease at 130°C and can go down to 0.
- The boost circuit uses synchronous rectification, achieving a maximum efficiency of 90% with low heat generation, providing a fixed output of 5.10V, without requiring external resistors.
- Maximum output current not lower than 0A (BTP=3.6V).
- Supports constant power output with comprehensive overcurrent, short-circuit, and built-in thermal protection; automatic shutdown of boost mode at high temperature.
- Automatic boost activation when load is inserted; enters sleep mode when load current is below 50mA or load is removed.
- Four-LED indicator for more accurate battery level indication, with low battery warning feature.
- Equipped with an Apple D+ and D- voltage divider resistor setting port (DPDN) and an NTC setting port to ensure system operates within safe temperature range.
- Can directly drive LED lights with a maximum current of 50mA without the need for external current-limiting resistors.
- Fixed switching frequency of 1MHz.
- Battery overcharge and over-discharge protection.
- 4KV ESD protection.
- SOP16 Package.
3. Typical Application Circuit Diagram
4. Pin Diagram and Functional Description
|
|
Pin Name | Pin Number | Functional Description |
| VPROG | 1 | Lithium Battery Selection (Floating for 4.2V, shorted to ground for 4.35V) | |
| NTC | 2 | NTC Resistor (Connect to DPDN pin when this function is not needed) | |
| LED | 3 | Flashlight | |
| DPDN | 4 | Pull-down Pin (Can drive DP, DN setting resistors) | |
| L4 | 5 | Indicator Light 4 | |
| L3 | 6 | Indicator Light 3 | |
| L2 | 7 | Indicator Light 2 | |
| L1 | 8 | Indicator Light 1 | |
| KEY | 9 | Function Switch | |
| VOUT | 10 | Boost Output Sampling | |
| VCOM | 11 | Output/Input Pin | |
| LX | 12 | Boost Inductor Pin | |
| PGND | 13 | Power Ground | |
| AGND | 14 | Analog Ground | |
| IPROG | 15 | Charging Current Adjustment Pin (Short to ground for 1A charging current) | |
| BTP | 16 | Battery Pin |
5. Features
- Charging Management Module.
- Boost Converter Module.
- Automatic Switch Module for Simultaneous Charging and Discharging.
- Charge/Discharge Indicator Lights.
- Charger Detection During Single-Port Discharge.
- PCB Layout Reference.
- Electrostatic Protection Measures.
