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MP1531

Low Power, Triple Output Step-Up Plus Charge Pump for TFT Bias

Monolithic Power Systems 

The Future of Analog IC Technology

DESCRIPTION

The MP1531 is a triple output step-up converter

with charge-pumps to make a complete DC/DC

converter to power a TFT LCD panel from a

2.7V to 5.5V supply.

The MP1531 includes a 250KHz fixed frequency

step-up converter and a positive and negative

linear regulator. The linear regulators are

powered via charge-pumps driven by the step-up

converter switch node.

A single on/off control enables all 3 outputs.

The outputs are internally sequenced at

power-on for ease of use. An internal soft-start

prevents overloading the input source at

startup. Cycle-by-cycle current limit reduces

component stress.

The MP1531 is available in both a tiny 16-pin

QFN package (3mm x 3mm) and a 16-pin

TSSOP package.

EVALUATION BOARD REFERENCE

Board Number

Dimensions

EV1531DQ-002A

2.3”X x 2.3”Y x 0.5”Z

MP1531

Low Power, Triple Output Step-Up

Plus Charge Pump for TFT Bias

FEATURES

• 2.7V to 5.5V Operating Input Range

• 500mA Switch Current Limit

• 3 Outputs in a Single Package

• Step-Up Converter up to 22V

• Positive 10mA Linear Regulator

• Negative 10mA Linear Regulator

• 250mΩ Internal Power MOSFET Switch

• 95% Efficiency

• 1µA Shutdown Mode

• Fixed 250KHz Frequency

• Positive Regulator up to 38V

• Negative Regulator down to -20V

• Internal Power-On Sequencing

• Adjustable Soft-Start/Fault Timer

• Thermal Shutdown

• Cycle-By-Cycle Over Current Protection

• Under Voltage Lockout

• Ready Flag

• 16-Pin TSSOP and QFN (3mm x 3mm) Packages

APPLICATIONS

• TFT LCD Displays

• Portable DVD Players

• Tablet PCs

• Car Navigation Displays

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

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

VIN

2.7V-4.2V

OFF ON

TO

SW

VGL

-4V

EN

CT

RDY

IN

SW

COMP

FB1

IN2

MP1531

IN3

GL

FB2

GH

FB3

REF

GND

PGND

VMAIN

5V

VGH

12V

Efficiency vs

Load Current

100

VIN = 4.2V

90

80

VIN = 3.3V

70

60

50

40

30

VMAIN = 5V

20

0

100 200 300 400 500 600

LOAD CURRENT (mA)

MP1531 Rev. 1.2

www.MonolithicPower.com

1

5/22/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

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