MP3387A

6-String, Max 80mA/String,

Step-Up, White LED Driver with

Combined Analog and PWM Dimming

MP3387A Rev. 1.0

www.MonolithicPower.com

1

5/17/2017

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© 2017 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

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.

The MP3387A uses peak-current mode as its

PWM

control

architecture.

The

switching

frequency can be programmed by a resistor.

The MP3378M generates an output voltage up

to 45V from a 3V-to-26V input supply. The

MP3387A regulates the current in each LED

string independently to the value set by an

external current-setting resistor.

The MP3387A applies six internal current

sources in each LED string terminal to achieve

a current balance with 1.5% current regulation

accuracy between strings. Its low 500mV

regulation voltage on the LED current sources

reduces power loss.

The MP3387A features external digital PWM

dimming and analog dimming, both of which

share a single input with a 25% PWM duty

cycle as a transfer point. The mix-dimming

strategy helps improve the dimming ratio. The

MP3387A also transfers the PWM input signal

from a 100Hz-to-20kHz frequency to 24kHz to

27.5kHz automatically to eliminate audible

noise.

Full protection features include recoverable

over-current protection (OCP), over-voltage

protection (OVP), over-temperature protection

(OTP), and short and open protection of any

string on the LED.

The MP3387A is available in a TQFN-24

(4mmx4mm) package.

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

 Cycle-by-Cycle

Over-Current

Protection

(OCP)

 Under-Voltage Lockout (UVLO)

 Available in a TQFN-24 (4mmx4mm)

Package

APPLICATIONS

 Notebook PC

 Small LCD TV

 Handheld Terminal Display

 Automotive System and Tablet Computer

All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For

MPS green status, please visit the MPS website under Quality

Assurance. “MPS” and “The Future of Analog IC Technology” are registered

trademarks of Monolithic Power Systems, Inc.