TFT-LCD Power-Supply Controllers

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9

Pin Description (continued)

NAME

PIN

MAX1513

MAX1514

FUNCTION

8

DRVN

DRVN

REG N Base Drive. Open drain of an internal P-channel MOSFET. Connect to the base of an

external NPN linear-regulator pass transistor.

9

DRVL

DRVL

Logic Linear-Regulator (REG L) Base Drive. Open drain of an internal N-channel MOSFET. Connect

to the base of an external PNP linear-regulator pass transistor.

10

FBL

FBL

REG L Feedback Input. FBL regulates to 1.25V (typ). Connect to the center tap of a resistive

voltage-divider between the REG L output and the analog ground plane to set the output voltage.

Place the resistive voltage-divider close to this pin.

11

DRVG

N.C.

Gamma Linear-Regulator (REG G) Base Drive for the MAX1513. Open drain of an internal N-channel

MOSFET. Connect to the base of an external PNP linear-regulator pass transistor. Not internally

connected for the MAX1514.

12

FBG

N.C.

REG G Feedback Input for MAX1513. FBG regulates to 1.25V (typ). Connect to the center tap of a

resistive voltage-divider between the REG G output and the analog ground plane to set the output

voltage. Place the divider close to the FBG pin. Not internally connected for the MAX1514.

13

FBP

FBP

Gate-On Linear-Regulator (REG P) Feedback Input. FBP regulates to 1.25V (typ). Connect to the

center tap of a resistive voltage-divider between the REG P output and the analog ground plane to

set the output voltage. Place the resistive-divider close to this pin.

14

DRVP

DRVP

REG P Base Drive. Open drain of an internal N-channel MOSFET. Connect to the base of an

external PNP linear-regulator pass transistor.

15

GND

GND

Ground

16

GATE

GATE

External MOSFET Gate Drive. Drives the gate of the step-up switching regulator’s MOSFET.

17

IN

IN

Supply Input. IN powers all the internal circuitry of the MAX1513/MAX1514. The input voltage range

is from 2.7V to 5.5V. Bypass with a 0.1µF ceramic capacitor between IN and GND. Place the

capacitor within 5mm of IN.

18

CS+

CS+

Current-Sense-Comparator Noninverting Input. Connect CS+ and CS- to the lossless current-sense

network. See the Lossless Current Sense section.

19

CS-

CS-

Current-Sense-Comparator Inverting Input. Connect CS+ and CS- to the lossless current-sense

network. See the Lossless Current Sense section.

20

FB

FB

Main Step-Up Regulator Feedback Input. FB regulates to 1.25V (typ). Connect to the center tap of a

main step-up regulator output voltage. Place the resistive-divider close to this pin.