UM1661 - High Efficiency Low Noise PFM Step-Up DC/DC Converter

Product Overview

Union Semiconductor

Datasheet Details

Part number	UM1661
Manufacturer	UniON Semiconductor
File Size	170.16 KB
Description	High Efficiency Low Noise PFM Step-Up DC/DC Converter
Datasheet	UM1661 Datasheet
Additional preview pages of the UM1661 datasheet.

Product details

Description

The UM1661 PFM step-up DC/DC Converter drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices.

Features

allowing series connection of the white LEDs so that the LED currents are identical for uniform brightness. An enable input can be pulsed repeatedly to adjust LEDs brightness. The fast 500kHz to 2MHz operation frequency allows for smaller capacitor and inductor. Fault condition protection uses cycle-by-cycle current limiting to sense maximum inductor current and over-voltage protection. The 0.2V low reference voltage minimizes the power loss across the current sense resistor. The converter can o.

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Published: Jan 8, 2019 |