MAX1997 datasheet(4/31 Pages) MAXIM

4 / 31 page

Quintuple/Triple-Output TFT LCD Power Supplies

with Fault Protection and VCOM Buffer

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, VIN = 3V, VDDB = 10V, SHDN = ONDC = FREQ = IN, CREF = 0.22µF, PGND = GND, TA = 0°C to +85°C.

Typical values are at TA = +25

°C, unless otherwise noted.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

FBN Effective Load Regulation Error

(Transconductance)

VDRVN = -10V, IDRVN = 50µA to 1mA

FBN Line (IN) Regulation Error

IDRVN = 100µA, 2.7V < VIN < 5.5V

Bandwidth

(Note 2)

1000

kHz

DRVN Source Current

VFBN = 200mV, VDRVN = -10V

4.2

DRVN Leakage Current

VFBN = -0.1V, VDRVN = -20V

0.1

µA

Soft-Start Period

4096/fOSC

Soft-Start Step Size

VREF/32

VCOM BUFFER (MAX1997 only)

VDDB Supply Range

4.5

VDDB Supply Current

VFBPB = VFBNB = 5V, VDDB = 9V

367

900

µA

VDDB Shutdown Current

VDDB = 13V, SHDN = ONDC = GND

3.5

µA

Input Offset Voltage

VFBPB = 2.5V, no load

-5

Input Bias Current

VFBPB = VFBNB = 1.2V to VDDB - 1.2V

µA

Input Offset Current

VFBPB = VFBNB = 1.2V to VDDB - 1.2V

-100

+100

Input Common-Mode Range

VDDB = 4.5V to 13V

1.2

VDDB -

1.2

Power-Supply Rejection Ratio

VDDB = 4.5V to 13V, VFBPB = 2.25V

Common-Mode Rejection Ratio

VFBPB = VFBNB = 1.2V to VDDB - 1.2V

Gain-Bandwidth Product

Small signal

1/6

πCL

Load-Transient Settling Time

RL = 25

Ω, CL = 10nF, VDRIVE = 9V, settle to within

10mV (Note 4)

µs

Small signal (

±1mV overdrive)

0.3

Transconductance

Large signal (

±30mV overdrive)

7.2

µS

Output Current Drive

±100mV overdrive, VOUTB = 3V or 7V

±150

±300

LOGIC SIGNALS (SHDN, ONDC)

Input Low Voltage

100mV typ hysteresis

0.4

Input High Voltage

1.6

Input Current

0.01

µA

CONTROL INPUTS AND OUTPUTS

ONN, ONP, ON2 Comparator Offset

V ON_ - VCT, VCT = 1.25V ±50mV

-50

+50

DRVA Sink Current

VDRVA = 10V, VCT = 1.25V, V ON2 = 2V

DRVA Off-Leakage

VDRVA = 28V, VCT = 1.25V, V ON2 = 1V

0.1

µA

CT Source Current

VCT = 1V

2.5

7.5

µA

CT Discharge Resistance

VCT = 1V

100

Ω

FREQ, PFLT Input Low Voltage

FREQ, PFLT Input Middle Voltage

VIN/2

FREQ, PFLT Input High Voltage

VIN - 1

FREQ, PFLT Input Current

FREQ, PFLT = GND or IN

-50

+50

µA

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