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

Datasheet Summary

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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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 download datasheet UM1661 Datasheet
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Full PDF Text Transcription

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