GENERAL DEscriptION

The SGM3750 is a high efficiency white LED driver with a 650kHz boost converter. With the fixed switching frequency and an internal 40V switch FET, the SGM3750 can use small components. The driver also achieves improved efficiency and reduced output ripple.

The SGM3750 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 SGM3750 integrates LED open protection. It prevents the device from damaging due to the over- voltage during LED open 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℃.

FEATURES

• Input Voltage Range: 2.7V to 20V

• Up to 90% Efficiency

• Switching Frequency: 650kHz

• Feedback Voltage: 200mV

• PWM Dimming Control

• PWM Dimming Frequency: 5kHz to 100kHz

• 38V LED Open Protection

• 600kΩ Pull-Down Resistor on CTRL Pin

• Automatic Soft-Start for Reducing Inrush Current

• Dimming Stable in More than 1:500 PWM Range

• -40℃ to +85℃ Operating Temperature Range

• Available in Green TDFN-2×2-6L and TSOT-23-6 Packages

APPLICATIONS

Mobile Phones

Portable Media Players

GPS Receivers

Backlight for Media Form Factor Display