SGM3145中文资料8-Channel PWM Dimming Charge Pump White LED Driver数据手册SGMICRO规格书

描述 Description

The SGM3145 is a current-regulated white LED driver with integrated low dropout current sources and a high efficiency charge pump. The charge pump has automatically selectable 1×/1.5× fractional operation modes. The SGM3145 is well suited for white LED applications powered by a Li-Ion battery due to small equivalent open-loop resistance in 1× mode.
The supply voltage operates from 2.7V to 5.5V. The SGM3145 supports up to 8 LEDs for 27mA maximum current per string. The LED reference current is set through an internal resistor. PWM dimming interface allows programmable LED current levels from 0mA to 27mA for brightness control. If the EN pin is logic low, the SGM3145 enters shutdown mode. Built-in soft-start circuitry avoids excessive inrush current during startup and mode transition.
The SGM3145 is available in a Green TQFN-3×3-20L package. It operates over an ambient temperature range of -40℃ to +85℃.

特性 Features

• Input Voltage Range: 2.7V to 5.5V

• Support up to 8 LEDs at 27mA Each

• PWM Dimming Interface

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

• Switching Frequency: 0.93MHz

• ±4.8% Regulated LED Current Matching

• Built-in Soft-Start for Reducing Inrush Current

• Low Input Ripple and Low EMI

• Protection Features
Over-Current Protection
Under-Voltage Lockout
Thermal Shutdown

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

• Available in a Green TQFN-3×3-20L Package

应用 Application

White LED Backlighting
Mobile Phones, MP3s
Digital Still Cameras
LCD Displays