EV3366-C-00A

6 Strings Boost White LED Driver

Evaluation Board

EV3366-C-00A Rev.1.1

www.MonolithicPower.com

1

8/2/2016

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© 2016 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP3366 is a step-up converter with 6-

channel current sources. It is designed for

driving the white LED arrays as backlighting of

mid- or larger- sized LCD panel.

The MP3366 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 MP3366

independently regulates the current in each

LED string to the value set by an external

current-setting resistor.

The MP3366 applies 6 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 LED current sources reduces power

loss.

The MP3366 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,

MP3366 automatically transfers the PWM input

signal 100Hz to 20kHz frequency to 23.5kHz to

29.5kHz to eliminate the audible noise.

MP3366

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

MP3366

is

available

in

CSP-

18(1.35mmX2.55mm) 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

 1.5% Current Matching Accuracy Between

Strings

 600kHz Switching Frequency

 Combined Analog and PWM Dimming Mode

with 25% Dimming Transfer Point

 23.5kHz to 29.5kHz Output Dimming

Frequency to eliminate audible noise

 Programmable Over-Voltage Protection

 Recoverable Thermal Shutdown Protection

 Cycle by Cycle Over Current Protection

 Under-Voltage Lockout

 Available in a WLCSP-18(1.35X2.55mm)

Package

APPLICATIONS

 Tablets

 NBs

 Handy Terminals Display

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

MPS green status, please visit MPS website under Quality Assurance. “MPS”

and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.