MP3371 3-30V, 8CH Boost WLED Driver QFN-24

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MP3371 3-30V, 8CH Boost WLED Driver QFN-24

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pMPS MP3371 — Boost WLED Driver, 3-30V input, 8 channels, QFN-24./p

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MPS QFN-24 LED Drivers Boost WLED LED Power Management

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MP3371 3-30V, 8CH Boost WLED Driver QFN-24

The MPS MP3371 is a Boost WLED Driver. It operates from a 3 V to 30 V input and drives 8 LED strings. It is supplied in a QFN-24 package.

The MP3371 is a synchronous boost converter with eight current channels designed to drive WLED arrays for LCD panels in tablets and notebook backlighting applications.

Key Specifications

Part Number	MP3371
Function	Boost WLED Driver
Input Voltage	3 V to 30 V
Channels	8
Interface	I²C
Package	QFN-24
Ordering Codes	MP3371

Features

8 Channels with Max 50mA/Channel
Synchronous Converter with 50V LS-FET/HS- FET 155m/235mΩ On Resistance
3V to 30V Input Voltage Range
470mV LED Regulation Voltage at 20mA
Max 2.5% Current Matching
350kHz, 500kHz, 650kHz, 800kHz, 950kHz, or 1.2MHz Selectable Switching Frequency
A1 Pins for Two I2C Addresses
0mA to 50mA Full-Scale LED Current, 8 Bits, 0.196mA/Step
Selectable Sync or Non-Sync Mode
Linear Smooth Dimming with 2µs, 4µs, 8µs, 16µs, 32µs, 64µs, or 128µs Step-Slope Set

Typical Application Circuit

Applications

Tablets/Notebooks

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.