SGM3142.pdf
No.10882
● Input Voltage Range: 2.7V to 5.5V
● Drives up to 6 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 TQFN4×4-16L Package
The SGM3142 is a high efficiency and cost effective charge pump white LED driver. It supports up to 6 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. Theoperating 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.
