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HT7939A

Part Number	HT7939A
Manufacturer	Holtek Semiconductor
Description	High Current and Performance White LED Driver
Published	May 12, 2018
Detailed Description	HT7939A High Current and Performance White LED Driver Feature • Input voltage range: 2.6V~5.5V • High efficiency - up t...
Datasheet	HT7939A PDF File

Overview

HT7939A High Current and Performance White LED Driver Feature • Input voltage range: 2.
6V~5.
5V • High efficiency - up to 90% • Integrated N-ch MOSFET • Can drive up to 39 WLEDs from a 5V input • Low standby current: 0.
1mA (typ.
) • Built-in OVP, OCP, OTP, UVLO protection • EN pin dimming frequency up to 200kHz • 1.
2MHz fixed switching frequency • SOT23-6 package Applications • Display backlighting –– Automatic –– DVD player –– Digital photo frame –– Handheld computer General Description The HT7939A is a high efficiency boost converter for driving multiple White LEDs using current mode operation.
The device is designed to drive up to 39 White LEDs from a 5V power supply.
The White LED current is setup using an external current setting resistor, which has a low feedback voltage of 0.
2V to minimise resistor power losses and thus improving efficiency.
The HT7939A has a dimming frequency of up to 200kHz, which has excellent linear performance over this d...

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