MP3385B 4.5-33V Output WLED Controller QFN-20

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MP3385B 4.5-33V Output WLED Controller QFN-20

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pMPS MP3385B — Output WLED Controller, 4.5-33V input, QFN-20./p

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MPS QFN-20 LED Drivers WLED LED Controller Power Management

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MP3385B 4.5-33V Output WLED Controller QFN-20

The MPS MP3385B is a Output WLED Controller. It operates from a 4.5 V to 33 V input. It is supplied in a QFN-20 package.

The MP3385B is a step-up controller with four regulated LED current (ILED) channels, designed to drive WLED arrays for mid-sized and large- sized LCD panel backlighting applications.

Key Specifications

Part Number	MP3385B
Function	Output WLED Controller
Input Voltage	4.5 V to 33 V
Output Voltage	80 V
Interface	I²C
Package	QFN-20
Ordering Codes	MP3385B

Features

4-String, Max 300mA/String WLED Driver
4.5V to 33V Input Voltage (VIN) Range
80V Absolute Maximum Rating for Each String
1.8% Current Matching Accuracy between Each String
Unused Channel Auto-Detection during Start-Up
100kHz to 900kHz Configurable Switching Frequency (fSW)
2% to 100% Configurable Full-Scale Current with 8-Bit Resolution
0% to 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 (OVP), 2V/Step

Typical Application Circuit

Applications

Desktop LCD Flat-Panel Displays
All-in-One PCs

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.