High Ei Ciency Boost Converter For Up To 10 LEDs

The SC4540 is designed to regulate current for a series string 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 The wide input voltage range of the SC4540 makes it ideal for use with dual-cell Li-ion powered applications. 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 boost circuit CAN output up to 38V (guaranteed) to drive up to 10 LEDs in series. 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 shut- down provide additional protection. A small external capacitor and series resistor control soft-start and loop compensation. Over-voltage detection protects the SC4540 if the BL pin is l oating or shorted to ground. The SC4540 is available in an MLPD-8 pin 2 x 2 x 0.6 (mm) package, with a rated temperature range of -40°C to +85°C. By Semtech Corporation
SC4540 's PackagesSC4540 's pdf datasheet

SC4540 Pinout, Pinouts
SC4540 pinout,Pin out
This is one package pinout of SC4540,If you need more pinouts please download SC4540's pdf datasheet.

SC4540 Application circuits
SC4540 circuits
This is one application circuit of SC4540,If you need more circuits,please download SC4540's pdf datasheet.

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