The SGM41536 is a standalone Buck charger for 1-cell to 4-cell Li-Ion or Li-polymer batteries. The charge voltage and current can be programmed by external resistors. The SGM41536 supports 4.1V to 22V input source voltage and provides 3A (MAX) charge current to 1-cell or 2-cell batteries and 2A (MAX) charge current to 3-cell or 4-cell batteries. The SGM41536 is highly integrated, including three main power switches: input reverse-blocking MOSFET (Q1, RBFET), high-side switching MOSFET (Q2, HSFET) and low-side switching MOSFET (Q3, LSFET).
Its low-impedance power path optimizes efficiency, reduces battery charging time, and extends battery life. The bootstrap diode of the high-side gate drive is also integrated to simplify the system design. The SGM41536 starts and completes the charge cycle without host control. A charge cycle automatically terminates when a full charge is detected if the device is not in thermal regulation. The charger automatically initiates a new charging cycle if the battery voltage falls below the recharge threshold.
The SGM41536 provides full protections for safety of battery charging, including battery temperature monitoring, charging safety timer, over-current and over-voltage protections, as well as pin open or short protections. When any fault occurs, the STAT pin reports the fault conditions.
The SGM41536 is available in a Green TQFN-3×3-16L package.
- 4.1 to 22V Operating Input Voltage Range
- 3.4V to 18V Programmable Charge Voltage
- Fully Integrated All MOSFETs, Current Sense and Loop Compensation
- 3A Maximum Charge Current for 1-2 Cells Battery
- 2A Maximum Charge Current for 3-4 Cells Battery
- High Frequency, 1.2MHz Synchronous Buck Charger
- 92.5% Charge Efficiency at 2A from 5V Input for 1-Cell Battery
- 92% Charge Efficiency at 2A from 9V Input for 1-Cell Battery
- 95% Charge Efficiency at 2A from 12V Input for 2-Cell Battery
- 96% Charge Efficiency at 1.5A from 15V Input for 3-Cell Battery
- 96% Charge Efficiency at 1A from 20V Input for 4-Cell Battery
- Input Voltage Dynamic Power Management (VINDPM) Tracking Battery Voltage
- 5nA (TYP) Low Battery Leakage Current at 4.5V VBAT
- 0.9µA (TYP) VBUS Supply Current in Disable Mode
- Charge Current Thermal Regulation at +120℃
- Pre-Charge Current: 10% of Fast Charge Current
- Termination Current: 10% of Fast Charge Current
- ±0.64% Charge Voltage Regulation
- Thermal Regulation and Thermal Shutdown
- VBUS/VBAT Over-Voltage Protection (OVP)
- Battery Charging Safety Timer
- Charge Disabled if Battery Feedback Pin FB is Open or Short
- Charge Disabled if ICHG Pin is Open or Short
- Fault Report on STAT Pin
- Available in a Green TQFN-3×3-16L Package
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