MP4603

White LED Driver for

Large LCD TV Backlights

MP4603 Rev. 1.0

www.MonolithicPower.com

1

4/27/2012

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

© 2012 MPS. All Rights Reserved.MP4603

The Future of Analog IC Technology

DESCRIPTION

The MP4603 is an integrated white LED driver.

It uses MPS’s patent-pending technology to

drive the backlights for LCD TVs measuring 60-

inches or larger, for LED string voltages up to

350V. This novel technology can leverage the

LED drive power by regulating only a small

portion of the LED drive voltage—together with

a fixed high-voltage source, a low-voltage LED

driver can drive high voltage LED strings. This

method allows for a super-high power density,

higher efficiency and lower cost due to the low

voltage stress, higher switching frequencies,

and smaller passive components.

The MP4603 is a current-mode–controlled

LED string with up to 100 LEDs. It can drive an

external switch in series with the LED string to

achieve over 1:1000 dimming ratio. Analog

dimming can be applied at the same time to

further improve the dimming ratio. Fault

protections include LED open-string protection,

output short-circuit protection, cycle-by-cycle

peak current limiting, and thermal shutdown.

The MP4603 is available in TSSOP16-EP and

SOIC16 packages.

FEATURES

 Novel Power-Leverage-Control Technology

 Unique Step-Up/Down Operation

 Up to 99.5% Efficiency

 0.5Ω Internal Power MOSFET

 Switching Frequency Synchronization

 Over 1:1000 Dimming Ratio

 Separate Analog and PWM Dimming

 ±5% 200mV Reference Voltage

 10μA Shutdown Mode

 Cycle-by-Cycle Over-Current Protection

 Thermal Shutdown Protection

 LED String Open and Short Protection

 FAULT Output at LED Protection

 Output Short-Circuit Protection

 Available in TSSOP16-EP and SOIC16

Packages

APPLICATIONS

 Large LCD Panels Backlighting

 High Power Street LED Lighting

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.