MAX8722 datasheet(10/20 Pages) MAXIM

10 / 20 page

Low-Cost CCFL Backlight Controller

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NAME

FUNCTION

GH1

High-Side MOSFET NH1 Gate-Driver Output

GL1

Low-Side MOSFET NL1 Gate-Driver Output

GL2

Low-Side MOSFET NL2 Gate-Driver Output

PGND

Power Ground. PGND is the return for the GL1 and GL2 gate drivers.

VDD

Low-Side Gate-Driver Supply Input. Connect VDD to the output of the internal linear regulator (VCC). Bypass

VDD with a 0.1µF capacitor to PGND.

VCC

5.3V/10mA Internal Linear-Regulator Output. VCC is the supply voltage for the device. Bypass VCC with a

1µF ceramic capacitor to GND.

GND

Analog Ground. The ground return for VCC, REF, and other analog circuitry. Connect GND to PGND under

the IC at the IC’s backside exposed metal pad.

Pin Description (continued)

MAX8722

GND

GH2

LX2

BST2

BST1

LX1

GH1

GL1

VDD

BATT

IFB

VFB

GL2

ISEC

CNTL

ILIM

FREQ

SYNC

PGND

COMP

VIN

VCC

DPWM

TFLT

VCC

SHDN

GND

ON/OFF

BRIGHTNESS

SYNC

DPWM

0.1µF

0.47µF

100kΩ

200kΩ

169kΩ

C10

0.01µF

C11

0.22µF

4.7µF

25V

0.47µF

0.1µF

NH1

NH2

NL1

NL2

1µF

CCFL

18pF

3kV

15nF

40.2Ω

150Ω

Figure 1. Typical Operating Circuit of the MAX8722

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