GENERAL DEscriptION
The SGM3749 is a high efficiency white LED driver with a 1.25MHz boost converter. With the fixed switching frequency and an internal 40V/1.5A switch FET, the SGM3749 is designed for powering high brightness LEDs in general lighting.
The SGM3749 is capable of driving up to 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 SGM3749 integrates LED open protection. It prevents the device from damaging due to the over- voltage during LED open conditions.
The SGM3749 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: 3V to 20V
Integrated 40V/1.5A Switch
Up to 90% Efficiency
Switching Frequency: 1.25MHz
Feedback Voltage: 200mV
PWM Dimming Control
PWM Dimming Frequency: 5kHz to 100kHz
38V LED Open Protection for 10 LEDs
600kΩ Pull-Down Resistor on CTRL Pin
Dimming Stable in More than 1:500 PWM Range
Automatic Soft-Start for Reducing Inrush Current
-40℃ to +85℃ Operating Temperature Range
Available in Green TDFN-2×2-6L and TSOT-23-6 Packages
APPLICATIONS
Backlight for Media Form Factor Display
High Brightness LED Lighting