GENERAL DEscriptION

The SGM3743 is a 2-channel white LED driver with high efficiency boost regulator. With an internal 40V/1.5A power MOSFET, it is well suited for smart phone backlight applications powered by 1-cell Li-Ion battery. The supply voltage operates from 3V to 18V.

The boost output has an adaptive voltage regulation with enough low headroom voltage. The SGM3743 is capable of driving up to 10S2P white LEDs while achieving high efficiency. It supports both PWM dimming control and one-wire digital dimming control. A programmable 9-bit brightness code allows for LED brightness control.

The SGM3743 includes a comprehensive set of protection features such as 38.5V over-voltage protection, over-current protection and thermal shutdown. Built-in soft-start circuitry avoids excessive inrush current during startup.

The SGM3743 is available in a Green WLCSP-1.32×1.32-9B package. It operates over an ambient temperature range of -40℃ to +85℃.

FEATURES

• Input Voltage Range: 3V to 18V

• Support up to 30mA Current per String

• Integrated 40V/1.5A MOSFET

• Up to 90% Efficiency

• Adaptive Boost Regulator

• Switching Frequency: 1.2MHz

• Optimized Rise Time and Fall Time to Reduce EMI on SW Pin

• 1% Regulated LED Current Matching and Accuracy

• Very Low Headroom Voltage: 90mV

• Independent Digital and PWM Dimming Control

• One-Wire Digital Dimming Interface

• PWM Dimming Interface

• Up to 9-Bit Resolution for LED Brightness

• Automatic Soft-Start for Reducing Inrush Current

• Dimming Stable in More than 1:500 PWM Range

• PFM Mode at Light Load

• Support 4.7μH Inductor

• Protection Features

  Over-Voltage Protection

  LED Open or Short Protection

  Thermal Shutdown

• -40℃ to +85℃ Operating Temperature Range

• Available in a Green WLCSP-1.32×1.32-9B Package

APPLICATIONS

Smart Phones

GPS Receivers

Handheld Devices

Backlight for Media Form Factor

LCD Displays with 1-Cell Battery