GENERAL DEscriptION
The SGM3735 is a high efficiency constant current LED driver with a 1MHz PWM boost converter. An internal low-side N-channel MOSFET and a high switching frequency make the SGM3735 easy to use small components and optimized for compact solutions.
The SGM3735 is capable of driving either up to 10 LEDs in series for 38V output or total 260mA current with 3 LEDs in series per string while achieving high conversion efficiency.
32-step FB reference voltage can be programmed by one-wire dimming interface. Compared to normal PWM dimming control, it can avoid audible noise and reduce inrush current.
The SGM3735 provides very low shutdown current. It also includes a comprehensive set of protection features such as over-voltage protection, cycle-by- cycle input current limit and thermal shutdown.
The SGM3735 is available in a Green TDFN-2×2-8L package. It operates over an ambient temperature range of -40℃ to +85℃.
FEATURES
Input Voltage Range: 2.7V to 5.5V
Support up to 10 LEDs in Series
Integrated 40V/1.35A Switch
High Efficiency PWM Boost Converter
Low Feedback Voltage: 200mV
500kΩ Pull-Down Resistor on EN/SET Pin
One-Wire Dimming Interface
Switching Frequency: 1MHz
38V LED Open Protection
Automatic Soft-Start for Reducing Inrush Current
Less than 1μA Shutdown Current
-40℃ to +85℃ Operating Temperature Range
Available in a Green TSOT-23-6 Package
APPLICATIONS
LED Backlighting
Mobile Phones and Digital Photo frames
Portable Devices
Automotive Navigation