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MP1531

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

Monolithic Power Systems 

MP1531 – LOW POWER, TRIPLE OUTPUT STEP-UP PLUS CHARGE PUMP FOR TFT BIAS

OPERATION

The MP1531 is a step-up converter with two

integrated linear regulators to power TFT LCD

panels. Typically the linear regulators are

powered from diode charge-pumps driven from

the switch node (SW). The user can set the

positive charge-pump to be a doubler, tripler, or

quadrupler to achieve the required linear

regulator input voltage for the selected output

voltage. Typically the negative charge-pump is

configured as a 1x or 2x inverter.

IN

FB1

COMP

VREF

+

GM

--

REFERENCE

PULSE-WIDTH

MODULATOR

REF

SW

0.8VREF

+

--

0.2VREF

+

--

EN

CT

FB2

+

--

IN2

GL

OSCILLATOR

SOFT-START

FAULT TIMER

&

SEQUENCING

0.8VREF

+

--

VREF

--

+

PGND

FB3

IN3

GH

RDY

GND

Figure 1—Functional Block Diagram

MP1531 Rev. 1.2

www.MonolithicPower.com

5

5/22/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

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