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MAX17075
(Rev.:2008)

Boost Regulator with Integrated Charge Pumps, Switch Control, and High-Current Op Amp

Maxim Integrated 

Boost Regulator with Integrated Charge Pumps,

Switch Control, and High-Current Op Amp

VVCC

VGOFF

SUP

POS

NEG

OUT

BGND

SRC

VGON

COM

SWITCH

CONTROL

DRN

VVCC

VCC

SEQUENCE

REF

REF

AGND

FBN

DRVN

NEGATIVE

CHARGE

PUMP

BOOST

CONTROLLER

LX

PGND

FB

COMP

DEL

MAX17075

CTL

FROM TCON

OSC

RSTIN

RST

DRVP

POSITIVE

CHARGE

PUMP

FBP

SUP

VAVDD

VVCC

VAVDD

POUT

VAVDD

Figure 2. Functional Diagram

Detailed Description

The MAX17075 contains a step-up switching regulator

to generate the source driver supply, and two charge-

pump regulators to generate the gate-driver supplies.

Each regulator features adjustable output voltage, digi-

tal soft-start, and timer-delayed fault protection. The

step-up regulator uses fixed-frequency current-mode

control architecture. The MAX17075 also includes one

high-performance operational amplifier designed to

drive the LCD backplane (VCOM). The amplifier fea-

tures high output current, fast slew rate (45V/µs), wide

bandwidth (20MHz), and rail-to-rail outputs. In addition,

the MAX17075 features a high-voltage switch-control

block, a 1.25V reference output, well-defined power-up

and power-down sequences, and thermal-overload

protection. Figure 2 shows the MAX17075 functional

block diagram.

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