GENERAL DEscriptION

The SGM3756 is an asynchronous Boost WLED driver with high efficiency, low EMI and high output voltage. The Boost converter integrates a 40V, 1.5A internal FET which operates at 1.2MHz switching fre Its strong driving ability can drive single or multiple parallel LED strings, which can be used as LED driver for smart phone and tablet backlight.

The default LED current can be programmed by the external current-sense resistor RSET. By varying the duty cycle of the PWM signal applied to the CTRL pin, the internal reference voltage is adjusted, which ultimately adjusts the LED sink current. With full PWM duty cycle, the internal reference voltage VREF is 200mV (TYP). The SGM3756 is essentially a driver that adopts analog dimming control, and it will not produce audible noise on the output capacitor. The SGM3756 integrates ringing cancellation, and it can effectively reduce EMI noise in DCM mode. The SGM3756 provides excellent line regulation and load regulation, as well as excellent load transient response. The SGM3756 also features various protection functions such as open LED protection, OCP protection and thermal shutdown protection.

The SGM3756 is available in a Green TDFN-2×2-6L package. It operates over an ambient temperature range of -40℃ to +85℃.

FEATURES

• Input Voltage Range: 2.7V to 5.5V

• 1:250 Stable Luminance Dimming

• Low EMI by Conducting Ringing Cancelling

• Improved PSRR for Waveless Lighting

• Up to 90% Efficiency

• Switching Frequency: 1.2MHz

• Integrated 40V/1.5A Switch

• Feedback Voltage: 200mV

• PWM Dimming Control

• 38V LED Open Protection for 10 LEDs

• Automatic Soft-Start for Reducing Inrush Current

• Under-Voltage Lockout Protection

• Thermal Shutdown

• -40℃ to +85℃ Operating Temperature Range

• Available in a Green TDFN-2×2-6L Package

APPLICATIONS

Portable Devices Backlight

Small and Medium Size White LCD Display Backlight