MP3385 4.5-33V Output WLED Controller TSSOP20

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MP3385 4.5-33V Output WLED Controller TSSOP20

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pMPS MP3385 — Output WLED Controller, 4.5-33V input, TSSOP20./p

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MPS TSSOP20 LED Drivers WLED LED Controller Power Management

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MP3385 4.5-33V Output WLED Controller TSSOP20

The MPS MP3385 is a Output WLED Controller. It operates from a 4.5 V to 33 V input. It is supplied in a TSSOP20 package.

The MP3385 is a step-up controller with 4 regulated current channels designed to drive WLED arrays for middle and large-size LCD panel backlighting applications.

Key Specifications

Part Number	MP3385
Function	Output WLED Controller
Input Voltage	4.5 V to 33 V
Output Voltage	80 V
Interface	I²C
Package	TSSOP20
Ordering Codes	MP3385

Features

4-String, Max 300mA/String WLED Driver
4.5V to 33V Input Voltage Range
80V Abs. Rating for Each String
1.8% Current Matching Accuracy for Each String
Unused Channel Auto-Detection Function during Start-Up
100kHz-900kHz Programmable Switching Frequency
2%-100% Programmable Full Scale Current with 8-Bit Resolution
0%-100% LED Dimming Range with 10-Bit Resolution for Internal Dimming Mode
Cascading Capability with a Single Power Source
18V to 80V Over-Voltage Protection, 2V/Step

Typical Application Circuit

Applications

Desktop LCD Flat Panel Displays
All-in-One

Design Notes

Channel-to-channel current matching sets backlight uniformity; check the matching spec at the current you will actually run.
In boost topologies the OVP threshold must clear the worst-case forward voltage of the longest string, including temperature and binning spread.
Keep PWM dimming above 200 Hz to stay clear of visible flicker, and away from the audio band if the product has a speaker.
Size the inductor and output capacitor for the string current ripple, not the total LED current.