GENERAL DEscriptION

The SGM3766 is a high efficiency white LED driver with a 1.2MHz boost converter. With the fixed switching frequency and an internal 40V/2.75A switch FET, the SGM3766 is designed for powering single or parallel LED strings for various size panel backlighting.

The SGM3766 is capable of driving 10 white LEDs in series. The FB feedback voltage is regulated at 200mV typically. The default LED current is programmed by an external RSET resistor. During the operation, the LED current can be controlled by applying a PWM signal to the CTRL pin. The feedback voltage depends on the PWM signal duty cycle. For PWM dimming control, there are no audible noises on the output capacitor.

The SGM3766 integrates LED open protection. It prevents the device from damaging due to the over- voltage during LED open conditions.

The SGM3766 is available in a Green TSOT-23-5 package. It operates over an ambient temperature range of -40℃ to +85℃.

FEATURES

• Input Voltage Range: 2.7V to 5.5V

• Integrated 40V/2.75A Switch

• Up to 90% Efficiency

• Switching Frequency: 1.2MHz

• Feedback Voltage: 200mV

• PWM Dimming Control

• 38V LED Open Protection for 10 LEDs

• Automatic Soft-Start for Reducing Inrush Current

• 1:500 Stable Luminance Dimming

• Low EMI by Conducting Ringing Cancelling

• Improved PSRR for Waveless Lighting  

• Protection Features

  Over-Voltage Protection

  Under-Voltage Lockout Protection

  Thermal Shutdown

• -40℃ to +85℃ Operating Temperature Range

• Available in a Green TSOT-23-5 Package

APPLICATIONS

Smart Phone and Tablet Backlighting

Handheld Computers, PDAs, GPS Receivers

Backlight for Media Form Factor Displays