Set-up White LED Converter

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The SP6699 is an inductor-based DC-to-DC converter designed to drive up to 5 white LEDs in series for LCD modules and keypad backlighting functions. Only one feedback resistor is needed to control the LED current and obtain the desired brightness. A 1.0MHz constant frequency PWM control scheme is used, enabling the usage of small external components.

A typical application needs a 1mm tall inductor and a 0.22µF output capacitor. Additionally, the boost circuit Schottky diode is integrated, further reducing the overall footprint. A logic controlled enable pin allows this device to be placed in a low current consumption mode of a few microamps. Furthermore, the SP6699 is equipped with an overvoltage output protection circuit which clamps the output voltage to 27V when any LED fails or in other abnormal conditions.

 

Overvoltage Protection

The SP6699 has an internal open-circuit protection circuit. When the LEDs are disconnected from the circuit or fail open, the output voltage is clamped at 27V. The SP6699 will switch at a low frequency and minimize input current.

 

FEATURES High output voltage: up to 27V    - Drives 2 to 5 LEDs @ 20mA    - High efficiency up to 84% Integrated Schottky diode Fast 1.0MHz switching frequency 200mV feedback voltage PWM dimming capability up to 1kHz Over output voltage protection Internal soft start circuit Small SOT-23-6 package

APPLICATIONS Cellular phones LCD modules Keypad backlighting Digital cameras GPS receivers Portable media players

 

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
SP6699EK-L		Set-up White LED Converter

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