MP3318 2.7-5.5V, 3CH, 1MHz Linear/Exponential Dimming Step-Up WLED Driver WLCSP-12

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MP3318 2.7-5.5V, 3CH, 1MHz Linear/Exponential Dimming Step-Up WLED Driver WLCSP-12

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pMPS MP3318 — Linear/Exponential Dimming Step-Up WLED Driver, 2.7-5.5V input, 3 channels, WLCSP-12./p

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MPS LED Drivers WLED LED Power Management Step-Up WLCSP-12

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MP3318 2.7-5.5V, 3CH, 1MHz Linear/Exponential Dimming Step-Up WLED Driver WLCSP-12

The MPS MP3318 is a Linear/Exponential Dimming Step-Up WLED Driver. It operates from a 2.7 V to 5.5 V input, drives 3 LED strings and switches at 1 MHz. It is supplied in a WLCSP-12 package.

The MP3318 is a WLED step-up converter with three current sinks and a 2.7 - 5.5V power supply input.

Key Specifications

Part Number	MP3318
Function	Linear/Exponential Dimming Step-Up WLED Driver
Input Voltage	2.7 V to 5.5 V
Channels	3
Switching Frequency	1 MHz
Interface	I²C
Package	WLCSP-12
Ordering Codes	MP3318

Features

2.7V - 5.5V Input Voltage
42V, 250mΩ Internal MOSFET
3-Channel Current Sink, Each Channel Enable/Disable Respectively
LED Current Up to 25mA in Backlighting Mode
Linear or Exponential Analog Dimming
LED Current Up to 50mA in Flash Mode
11-Bit Dimming Resolution
Excellent LED Current Accuracy
Excellent LED String Current Matching
500kHz/1MHz Switching Frequency with Optional -12% Shift

Typical Application Circuit

Applications

Smartphones
GPS Receivers

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.