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HT7938A

Part Number	HT7938A
Manufacturer	Holtek Semiconductor
Description	High Current and Performance White LED Driver
Published	May 12, 2018
Detailed Description	HT7938A High Current and Performance White LED Driver Feature • Efficiency up to 90% at VIN=4.0V, 5S2P, ILED=20mA • 1...
Datasheet	HT7938A PDF File

Overview

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.
The continuous LED current is set using the device FB pin regulated voltage across an external sense resistor, RFB, connected between this pin and ground.
The integrated open load protection feature...

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