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UM1351 - Hysteretic Buck High Brightness LED Driver

General Description

The UM1351 is a PWM step-down converter with internal power switch, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage.

The UM1351 can drive up to 8 series connected LEDs.

Key Features

  • z Hysteretic Control with High Side Current Sensing z Integrated 35V 0.5Ω NDMOS z Up to 98% Efficiency z Wide Input Voltage Range: 6V to 35V z ± 5% LED Current Accuracy z Adjustable Constant LED Current z Analog or PWM Control Signal for PWM Dimming z Over Temperature, Open Circuit LED Protection z Up to 1MHz Switching Frequency z Pb-Free SOT89-5 and SOT23-5 Packages ________________________________________________________________________ http://www. union-ic. com Rev.04 Apr.2016 1/14 Pin Conf.

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Datasheet Details

Part number UM1351
Manufacturer Union Semiconductor
File Size 458.64 KB
Description Hysteretic Buck High Brightness LED Driver
Datasheet download datasheet UM1351 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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UM1351 Hysteretic Buck High Brightness LED Driver with Internal Switch UM1351Y SOT89-5 UM1351S SOT23-5 General Description The UM1351 is a PWM step-down converter with internal power switch, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The UM1351 can drive up to 8 series connected LEDs. The device operates from an input supply between 6V and 35V and employs hysteretic control with a high side current sense resistor to set the constant output current up to 700mA. The device is well suited for applications requiring a wide input range. The high side current sensing and an integrated current sensing circuitry minimize the number of external components while delivering an accurate average output current.