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MAX16929

Automotive TFT-LCD Power Supply with Boost

Converter and Gate Voltage Regulators

ELECTRICAL CHARACTERISTICS (continued)

(Note 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Spread-Spectrum Factor

SSR

As a percentage of switching frequency,

Q

4

%

BOOST CONVERTER

Switching Frequency

1.98

2.20

2.42

MHz

Maximum Duty Cycle

82

93.5

%

LXP Current Limit

Duty cycle = 70%,

Low boost current-

limit option

0.625

0.78

A

High boost current-

limit option

1.25

1.56

1.87

LXP On-Resistance

110

250

mI

LXP Leakage Current

8.5

20

F

A

Soft-Start Time

(Note 4)

30

ms

Output Voltage Range

18

V

FBP Regulation Voltage

0.985

1.0

1.015

V

0.98

1.0

1.02

PGOOD Threshold

Measured at FBP

0.74

0.85

0.96

V

FBP Load Regulation

-1

%

FBP Line Regulation

0.1

%/V

FBP Input Bias Current

Q

1

F

A

FBP to COMPV Transconductance

D

400

F

S

POSITIVE-GATE VOLTAGE REGULATOR (GH)

Output Voltage Range

5

29

V

CP Overvoltage Threshold

29.5

30.5

V

FBGH Regulation Voltage

0.98

1.0

1.034

V

PGOOD Threshold

0.83

0.85

0.87

V

FBGH Load Regulation

2

%

FBGH Line Regulation

2

%

FBGH Input Bias Current

Q

1

F

A

GH Output Current

20

mA

GH Current Limit

35

56

mA

GH Soft-Start Time

7.45

ms

NEGATIVE-GATE VOLTAGE REGULATOR (GL)

Output Voltage Range

-24

-2

V

FBGL Regulation Voltage

0.212

0.242

0.271

V