The MAX8631X/Y charge pump drives up to eight white LEDs with regulated constant current for uniform intensity. The main group of LEDs (M1-M4) can be driven up to 30mA per LED for backlighting. The flash group of LEDs (F1-F4) is independently controlled and can be driven up to 100mA per LED (or 400mA total). Two 200mA LDOs are on-board to provide power for camera functions. The LDOs’ output voltages are pin-programmable to meet different camera-module requirements. By utilizing adaptive 1x/1.5x/2x charge-pump modes and very-low-dropout current regulators, the MAX8631X/Y achieves high efficiency over the full 1-cell lithium-battery voltage range. The 1MHz fixed-frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure low EMI and low input ripple.
The MAX8631X/Y charge pump drives up to eight white LEDs with regulated constant current for uniform brightness. It provides two independent groups: a main backlight group (M1‑M4) up to 30 mA per LED and a flash group (F1‑F4) up to 100 mA per LED (400 mA total). Two on‑board 200 mA low‑noise LDOs supply camera functions, and their output voltages are pin‑programmable.
The device operates in adaptive 1×, 1.5×, and 2× charge‑pump modes with a 1 MHz switching frequency, delivering high efficiency (up to 94 %). It includes soft‑start, over‑voltage, thermal‑shutdown, and true‑shutdown protection, and is packaged in a 28‑pin thin QFN (4 mm × 4 mm, lead‑free).
| Maximum Main LED Current per LED | 30 mA |
|---|---|
| Maximum Flash LED Current (total) | 400 mA |
| LDO Output Current | 200 mA |
| Efficiency (max) | 94 % max |
| Package | 28‑pin thin QFN, 4 mm × 4 mm |
| Operating Temperature Range | -40 °C to +85 °C |
| Switching Frequency | 1 MHz |
It can drive up to eight white LEDs – four for backlighting and four for flash.
The flash group can deliver up to 400 mA total (100 mA per LED).
The MAX8631X/Y includes soft‑start, over‑voltage, thermal‑shutdown, and true‑shutdown protection.