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MAX16928

Automotive TFT-LCD Power Supply with Boost

Converter and Gate Voltage Regulators

Pin Configuration

Pin Description

PIN

NAME

FUNCTION

1

ENP

Boost Circuitry and 1.8V/3.3V Regulator Controller Enable Input. ENP has an internal 500kI pulldown

resistor. Drive high for normal operation and drive low to place the device in shutdown.

2

DR

1.8V or 3.3V Regulator Output. DR has a 4.5mA (min) drive capability. For greater output current capa-

bility, use an external npn bipolar transistor whose base is connected to DR.

3

FB

1.8V or 3.3V Regulator Feedback Input. FB is regulated to 1.8V or 3.3V. Connect FB to DR when power-

ing loads demanding less than 4.5mA. For greater output current capability, use an external npn bipo-

lar transistor whose emitter is connected to FB.

4

GATE

External p-Channel FET Gate Drive. GATE is an open-drain driver connected to the gate of the external

input series p-channel FET. Connect a pullup resistor between GATE and INA. During a fault condition,

the gate driver turns off and the pullup resistor turns off the FET.

5

PGNDP

Boost Converter Power Ground

6

LXP

Boost Converter Switching Node. Connect LXP to the inductor and catch diode of the boost converter.

7

INA

Boost Circuitry and 1.8V/3.3V Regulator Controller Power Input. Connect INA to a 3V to 5.5V supply.

8

COMPV

Boost Error Amplifier Compensation Connection. Connect a compensation network between COMPV to

GND.

9

FBP

Boost Converter Feedback Input. FBP is regulated to 1V. Connect FBP to the center of a resistive divid-

er connected between the boost output and GND.

10

N.C.

No Connection. Not internally connected.

11

PGOOD

Open-Drain Power-Good Output. Connect PGOOD to INA through an external pullup resistor.

12

CP

Positive-Gate Voltage Regulator Power Input. Connect CP to the positive output of the external charge

Characteristics table.

+

TOP VIEW

TSSOP

17

4

FBGH

GATE

18

3

FBGL

FB

19

2

REF

DR

20

1

SEQ

ENP

14

7

DRVN

INA

15

6

GND

LXP

13

8

GH

COMPV

12

9

CP

FBP

11

10

PGOOD

N.C.

16

5

COMPI

PGNDP

EP

MAX16928