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

UM1661 Description

UM1661 High Efficiency Low Noise PFM Step-Up DC/DC Converter UM1661 SOT23-6 General .
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 devic.

UM1661 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

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High Efficiency Low Noise PFM Step-Up Converter Union Semiconductor
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