MP3386

50V, 6 String White LED Driver

MP3386 Rev. 1.0

www.MonolithicPower.com

1

1/19/2012

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2012 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP3386 is a step-up converter with 6-

channel current sources designed for driving the

white LED arrays for large size LCD panel

backlighting applications.

The MP3386 uses current mode, fixed frequency

architecture. The switching frequency can be

selected at 1.25MHz or 625kHz. It generates an

output voltage up to 50V from a 4.5V to 25V input

supply. The MP3386 regulates the current in each

LED string to the user programmed value set by an

external current setting resistor.

The MP3386 applies 6 internal current sources in

each LED string terminal to get current balance.

And the current matching achieves 3% regulation

accuracy between strings. Its low 600mV

regulation voltage on LED current sources reduces

power loss and improves efficiency.

The MP3386 features external PWM dimming or

DC input PWM dimming, which allows the flexible

control of the backlighting luminance under wide

range of the ambient brightness, and also avoids

the possibility of PWM dimming audible noise. The

dimming PWM signal can be generated internally,

and the dimming frequency is programmed by an

external setting capacitor.

FEATURES

• High Efficiency and Small Size

• 4.5V to 25V Input Voltage Range

• 50V Maximum Step-up Voltage

• Balanced Driver for 6 Strings of WLED

• 3% Current Matching Accuracy Between

Strings

• Selectable Switching Frequency: 1.25MHz or

625kHz

• PWM or DC Input Burst PWM Dimming

• Programmable

Over-voltage

Protection

Threshold

• Under Voltage Lockout

• Open and Short LED Protection

• Thermal Shutdown

Package

APPLICATIONS

• Notebook & Netbook PC

• Small LCD TV

• Handy Terminals Display

• Automotive System and Tablet Computer

All MPS parts are lead-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.

TYPICAL APPLICATION

VIN

4.5V~25V

MP3386

VCC

VIN

COMP VFAULT

SW2

SW1

24

23

22

21

20

19

EN

OSC

FSET

PWMO

GND

PWMI

LED6

LED5

LED4

LED3

LED2

ISET

PGND1

PGND2

OVP

VOUT

NC

LED1

7

8

9

10

11

12

1

2

3

4

5

6

18

17

16

15

14

13

Enable

PWM

DIMMING

NC

L1

D1

M1

C1

C3

C2

R1

R2

C4

C5

C6