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