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HT7938A - High Current and Performance White LED Driver

Description

The HT7938A is high efficiency boost converter with constant current output for backlight applications in handheld devices.

Using a series connection of LEDs provides constant identical LED currents resulting in uniform brightness.

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Full PDF Text Transcription

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HT7938A High Current and Performance White LED Driver Feature • Efficiency up to 90% at VIN=4.0V, 5S2P, ILED=20mA • 1.2MHz fixed switching frequency • Low standby current: 0.1mA (typ.) at VEN=0V • Matches LED current • Tiny inductor and capacitors • EN pin dimming frequency up to 200kHz • Up to 10 strings White-LED (LED VF(Max.)=3.5V) • Tiny 6-lead SOT23-6 package • Built in OVP, OCP, OTP, UVLO protection Applications • Cellular phones • PDAs • DSCs • Handheld devices • White LED display backlighting General Description The HT7938A is high efficiency boost converter with constant current output for backlight applications in handheld devices. Using a series connection of LEDs provides constant identical LED currents resulting in uniform brightness.
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