● Input Voltage Range: 2.7V to 5.5V

● Drives up to 4 LEDs at 20mA Each

● 16-Step Brightness Control

● High Efficiency by Fractional Conversion with 1× and 1.5× Modes

● Automatic Charge Pump Mode Selection

● Switching Frequency: 1MHz

● 1% Typical LED Current Matching

● Internal Soft-start Limits Inrush Current

● Low Input Noise and Low EMI

● Over Current and Over Temperature Protection

● Output Over Voltage Protection

● Under Voltage Lockout with Hysteresis

● Available in Green TQFN3×3-16L Package

The SGM3133 is a high efficiency and cost effective charge pump white LED driver. It supports up to 4 white LEDs and regulates a constant current for uniform intensity. The part maintains the high efficiency by utilizing a 1×/1.5× fractional charge pump and low dropout current sources. The small equivalent 1× mode open loop resistance and ultra-low dropout voltage of

current source extend the operating time of 1× mode and optimize the efficiency of Li-ion battery in white LED applications.

User can easily configure each LED current from 1.25mA to 20mA by a pulse dimming control. The dimming of white LEDs current can be achieved by applying a pulse signal to the EN/SET pin. There are totally 16 steps of current could be set by users. The operating voltage range is 2.7V to 5.5V. Internal soft start circuitry effectively reduces the in-rush current while both start-up and mode transition.

The SGM3133 is available in Green TQFN3×3-16L package and is specified over an ambient temperature range of -40℃ to +85℃.