EV3387L-RT-00A

6 strings Boost White LED Driver

Evaluation Board

DESCRIPTION

The MP3387L is a step-up converter with 6-

channel current sources. It is designed for

driving the white LED arrays as backlighting of

small or middle size LCD panel.

The MP3387L uses peak-current mode as its

PWM

control

architecture.

The

switching

frequency can be programmed by a resistor. It

generates an output voltage up to 45V from a

3V

to

25V

input

supply.

The

MP3387L

independently regulates the current in each

LED string to the value set by an external

current-setting resistor.

The

MP3387L

applies

6

internal

current

sources in each LED string terminal to achieve

a current balance with 3% current regulation

accuracy between strings. Its low 500mV

regulation voltage on LED current sources

reduces power loss.

The MP3387L features external digital PWM

dimming and analog dimming, both of which

sharing a single input with 25% PWM duty cycle

as a transfer point. The mix-dimming strategy

helps to improve the dimming ratio. Also,

MP3387L automatically transfers the PWM

input signal 100Hz to 20kHz frequency to

24kHz to 27.5kHz to eliminate the audible

noise.

MP3387L

has

rich

protection

modes

to

guarantee safety operation. The protection

modes include recoverable OCP (over-current

protection), OVP (over-voltage protection), OTP

(over-temperature protection), any string of LED

short and open protection.

The

MP3387L

is

available

in

TQFN24-

4mmX4mm package.

ELECTRICAL SPECIFICATIONS

Parameter

Symbol

Value

Units

Input Voltage

3 – 25

V

Output Voltage

VLED

<50

V

LEDs #

6 string

LED Current

20/string

mA

FEATURES

• 6-String, Max 45mA/String

• 3V to 25V Input Voltage Range

• 3% Current Matching Accuracy Between

Strings

• Programmable Switching Frequency

• Selectable Combined Analog and PWM

Dimming Mode or Pure 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

• Recoverable Thermal Shutdown Protection

• Cycle by Cycle Over Current Protection

• Under-Voltage Lockout

• TQFN24 (4X4mm) Package

APPLICATIONS

• Notebook PC

• Tablet Computer

• Handy Terminals Display

• Automotive System

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

status, please visit MPS website under Products, Quality Assurance page.

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

Monolithic Power Systems, Inc.

EV3387L-RT-00A Rev.1.0

www.MonolithicPower.com

1

2/11/2014

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