SC4538: High Efficiency Boost Converter For Up To 10 LEDs | Semtech

The SC4538 is designed to regulate current for a series chain of white LEDs in LCD backlighting applications where small size and high ei ciency are priorities. This device integrates an 800kHz current-mode PWM boost converter and a 30mA programmable low dropout current sink Regulator An external resistor sets the LED current up to 30mA. PWM dimming (100Hz to 50kHz) may be applied directly to the enable (EN) pin, or dimming CAN be controlled by applying an Analog signal to the ISET circuit. The SC4538 drives a string of up to 10 white LEDs with a forward voltage of 3.8V or less. The current Regulator protects against shorts between the BL and OUT pins and also eliminates backlight glow during shutdown when using LEDs with high leakage. Under-voltage lockout and thermal shutdown provide additional protection. A small external capacitor and series resistor control soft-start and loop compensation. Over-voltage detection protects the SC4538 if the LED pin is l oating or shorted to ground. The SC4538 is available in an MLPD-8 pin 2mmx 2xmm 0.6mm package, with a rated temperature range of -40C to +85C By Semtech Corporation
SC4538 's PackagesSC4538 's pdf datasheet

SC4538 Pinout, Pinouts
SC4538 pinout,Pin out
This is one package pinout of SC4538,If you need more pinouts please download SC4538's pdf datasheet.

SC4538 Application circuits
SC4538 circuits
This is one application circuit of SC4538,If you need more circuits,please download SC4538's pdf datasheet.

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