SC4538: High Efficiency Boost Converter for up to 10 LEDs
The SC4538 is designed to regulate current for a series chain of white LEDs in LCD backlighting applications where small size and high efficiency are priorities. This device integrates an 800kHz current-mode PWM boost converter and a 30mA programmable low dropout current sink regulator.
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- Input voltage range — 2.8V to 5.5V
- Current-mode PWM control — 800kHz
- Programmable LED current up to 30mA
- Soft-start to reduce in-rush current
- PWM dimming — 100Hz to 50kHz
- Analog and fi ltered-PWM dimming at ISET
- Over-voltage protection — 38V (min.)
- Under-voltage lockout (UVLO)
- Thermal shutdown
- Shutdown current — <1μA
- Ultra-thin package — 2mm x 2mm x 0.6mm
- Lead-free package, WEEE and RoHS compliant
- White LED Display Backlight Driver
- Smartphones and PDAs
- Cellular Handsets
- MP3 and Portable Media Players
- DSC, GPS, Satellite Radio, Game Players
- SC4538ULTRT: Lead-free, RoHS and WEEE compliant, 3000 pcs. Tape & Reel
