With a 40V rated integrated switch FET, the SGM3750 is a boost converter that drives LEDs in series. The boost converter runs at 650kHz fixed switching frequency to reduce output ripple, improve conversion efficiency, and allows for the use of small external components.
The default white LED current is set with the external sensor resistor RSET, and the feedback voltage is regulated to 200mV, as shown in the typical application. During the operation, the LED current can be controlled using PWM signal through the CTRL pin. The duty cycle of pulse width modulation (PWM) signal determines the feedback reference voltage. In PWM mode, the SGM3750 does not burst the LED current; therefore, it does not generate audible noises on the output capacitor. For maximum protection, the device features integrated open LED protection that disables the SGM3750 to prevent the output voltage from exceeding the IC’s absolute maximum voltage ratings during open LED conditions.
The SGM3750 is available in Green TDFN-2×2-6L and TSOT-23-6 packages. It operates over an ambient temperature range of -40℃ to +85℃.
Input Voltage Range: 2.7V to 20V
38V Open LED Protection
200mV Reference Voltage
600kΩ Pull-Down Resistor on CTRL Pin
PWM Brightness Control
5kHz to 100kHz PWM Dimming Frequency Range
Dimming Stable in More than 1:500 PWM Range
Up to 90% Efficiency
-40℃ to +85℃ Operating Temperature Range
Available in Green TDFN-2×2-6L and TSOT-23-6 Packages
Portable Media Players
Ultra Mobile Devices
White LED Backlighting for Media Form Factor Display