Triple Charge-Pump TFT LCD

DC-DC Converter

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3

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

FBN Input Bias Current

-50

+50

nA

DRVN PCH On-Resistance

36

Ω

1

5

Ω

DRVN NCH On-Resistance

20

k

Ω

FBN Power-Ready Trip Level

Falling edge

80

125

165

mV

FBN Fault Trip Level

Rising edge

140

mV

Negative Soft-Start Period

2.048/

s

POSITIVE LOW-POWER CHARGE PUMP

SUPP Input Supply Range

2.7

13

V

SUPP Quiescent Current

0.6

0.8

mA

SUPP Shutdown Current

0.1

10

µA

FBP Regulation Voltage

1.20

1.25

1.30

V

FBP Input Bias Current

-50

+50

nA

DRVP PCH On-Resistance

36

Ω

1.5

5

Ω

DRVP NCH On-Resistance

20

k

Ω

FBP Power-Ready Trip Level

Rising edge

1.090

1.125

1.160

V

FBP Fault Trip Level

Falling edge

1.100

V

Positive Soft-Start Period

2.048/

s

REFERENCE

Reference Voltage

-2

1.231

1.25

1.269

V

Reference Undervoltage

Threshold

0.95

1.05

1.18

V

LOGIC SIGNALS

SHDN Input Low Voltage

0.4

V

SHDN Bias Voltage

µA

580

724

830

mV

SHDN Bias Voltage Tempco

2

mV/

°C

SHDN Input Current Range

For 200kHz to 2MHz operation

3

65

µA

RDY Output Low Voltage

0.25

0.5

V

RDY Output High Leakage

0.01

1

µA