SGM3124 Overview
The SGM3124 is a charge pump with PWM brightness control for white LED supplies in LCD display backlight applications. The supply voltage ranges from 2.7V to 5.5V, it is ideally suited for all applications powered by a single Li-ion battery cell or three to four NiCd, NiMH, or alkaline battery cells. The device provides a constant current for each LED, and the initial current value can be set by an external resistor.
SGM3124 Key Features
- Input Voltage Range: 2.7V to 5.5V
- Drives up to 3 LEDs at 30mA Each
- LED Brightness Control Through PWM Control
- High Efficiency by Fractional Conversion with 1×
- Switching Frequency: 1MHz
- Regulated Output Current with 0.5% Matching
- Internal Soft-Start Limits Inrush Current
- Low Input Ripple and Low EMI
- Over-Current and Over-Temperature Protected
- Under-Voltage Lockout With Hysteresis