MP3387A 3-26V, 20kHz White LED Driver QFN-24

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MP3387A 3-26V, 20kHz White LED Driver QFN-24

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MPS QFN-24 LED Drivers LED Power Management

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MP3387A 3-26V, 20kHz White LED Driver QFN-24

The MPS MP3387A is a White LED Driver. It operates from a 3 V to 26 V input and switches at 20 kHz. It is supplied in a QFN-24 package.

The MP3387A is a step-up converter with 6- channel current sources designed to drive white LED arrays for backlighting in mid- to large- sized LCD panels.

Key Specifications

Part Number	MP3387A
Function	White LED Driver
Input Voltage	3 V to 26 V
Switching Frequency	20 kHz
Interface	PWM
Package	QFN-24
Ordering Codes	MP3387A

Features

6-String, Max 80mA/String
3V to 26V Input Voltage Range
1.5% Current Matching Accuracy between Strings
Programmable Switching Frequency
Selectable Combined Analog and PWM Dimming Mode or Direct PWM Dimming Mode
Combined Analog and PWM Dimming Mode with 25% Dimming Transfer Point
24kHz to 27.5kHz Output Dimming Frequency to Eliminate Audible Noise
Cascading Capability with a Single Power Source
Programmable Over-Voltage Protection (OVP)
Recoverable Thermal Shutdown Protection

Typical Application Circuit

Applications

Notebook PC
Small LCD TV
Handheld Terminal 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.