GENERAL DEscriptION

The SGM3142 is a current-regulated white LED driver with integrated low dropout current sources and a high efficiency charge pump. The charge pump has an automatically selectable 1×/1.5× fractional operation mode. The SGM3142 is well suited for white LED applications powered by a Li-Ion battery due to small e open-loop resistance in 1× mode. The supply voltage operates from 2.7V to 5.5V.

The SGM3142 contains a 4-bit digital-to-analog converter for 16-step LED current control. The LED current can be set between 1.25mA and 20mA by a serial pulse input signal into the EN/SET pin. Built-in soft-start circuitry avoids excessive inrush current during startup and mode transition.

The SGM3142 is available in a Green TQFN-4×4-16L package. It is specified over an ambient temperature range of -40℃ to +85℃.

FEATURES

• Input Voltage Range: 2.7V to 5.5V

• Support up to 6 LEDs at 20mA Each

• 16-Step LED Brightness Control through One-Wire Interface

• 1× and 1.5× Charge Pump for High Conversion Efficiency

• Automatic Charge Pump Mode Conversion

• Switching Frequency: 1MHz

• 1% Regulated LED Current Matching

• Built-in Soft-Start for Reducing Inrush Current

• Low Noise and Low EMI

• Protection Features

  Over-Current Protection

  Under-Voltage Lockout

  Thermal Shutdown

• Operating Temperature Range: -40℃ to +85℃

• Available in Green TQFN-4×4-16L Package

APPLICATIONS

White LED Backlighting

Color (RGB) Lighting

Digital Still Cameras