MP3384 4.5-25V 50V, 4-String White LED Driver QFN16

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MP3384 4.5-25V 50V, 4-String White LED Driver QFN16

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MPS QFN16 LED Drivers LED Power Management

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MP3384 4.5-25V 50V, 4-String White LED Driver QFN16

The MPS MP3384 is a 50V, 4-String White LED Driver. It operates from a 4.5 V to 25 V input. It is supplied in a QFN16 package.

The MP3384 is a step-up converter with 4-channel current sources designed for driving the white LED arrays for large size LCD panel backlighting applications.

Key Specifications

Part Number	MP3384
Function	50V, 4-String White LED Driver
Input Voltage	4.5 V to 25 V
Interface	PWM
Package	QFN16
Ordering Codes	MP3384

Features

High Efficiency and Small Size
4.5V to 25V Input Voltage Range
50V Maximum Step-up Voltage
Balanced Driver for 4 Strings of WLED
2.5% Current Matching Accuracy Between Strings
Selectable Switching Frequency: 1.25MHz or 625kHz
PWM Dimming
Programmable Over-voltage Protection
Under Voltage Lockout
Open and Short LED Protection

Typical Application Circuit

Applications

Notebook PC
Netbook PC
Digital Picture Frames
Handy Terminals Display

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.