MAX1997 datasheet(2/31 Pages) MAXIM

2 / 31 page

Quintuple/Triple-Output TFT LCD Power Supplies

with Fault Protection and VCOM Buffer

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

IN, SHDN, FB, FBP, FBN, FB1, FB2, ONDC,

ONP, ONN, ON2, TGNDA, TGNDB to GND.............-0.3V to +6V

PGND to GND .....................................................................

±0.3V

LX, VDDB to GND....................................................-0.3V to +14V

DRVP, DRV1, DRV2, DRVA to GND .......................-0.3V to +30V

REF, FREQ, GATE, OCN, OCP, CT,

PFLT to GND ..................................................-0.3V to VIN + 0.3V

DRVN to GND ..........................................VIN - 28V to VIN + 0.3V

FBPB, FBNB, OUTB to GND.......................-0.3V to VDDB + 0.3V

OUTB Continuous Output Current ..................................

±100mA

MAX1997 Continuous Power Dissipation (TA = +70

°C)

32-Pin Thin QFN

(derate 21.2mW/

°C above +70°C)............................1702mW

MAX1998 Continuous Power Dissipation (TA = +70

°C)

20-Pin Thin QFN

(derate 20mW/

°C above +70°C)...............................1600mW

Operating Temperature Range ...........................-40

°C to +85°C

Junction Temperature ......................................................+150

°C

Storage Temperature Range .............................-65

°C to +150°C

Lead Temperature (soldering, 10s) .................................+300

°C

ELECTRICAL CHARACTERISTICS

(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

IN Supply Range

2.7

5.5

VIN rising

2.5

2.7

2.9

IN Undervoltage Lockout Threshold

350mV (typ)

hysteresis

VIN falling

2.2

2.35

2.5

VFB = VFBP = VFB1 = VFB2 = 1.5V, VFBN = 0

(MAX1997 only)

0.54

1.25

IN Quiescent Current (Note 1)

VFB = VFBP = 1.5V, VFBN = 0 (MAX1998 only)

0.476

IN Shutdown Current

V SHDN = 0, VIN = 5.5V

0.1

µA

-2µA < IREF < 50µA

1.231

1.250

1.269

REF Output Voltage

-2µA < IREF < 75µA

1.225

1.250

1.275

Thermal Shutdown

160

°C

OVERCURRENT COMPARATOR

Input Offset Voltage

VOCN = VOCP = 1.5V to 0.8V

× VIN

-5

Input Bias Current

VOCN = VOCP = 0.8V

× VIN

-50

+50

OCN, OCP Input Common-Mode Range

1.5

0.8

VIN

FAULT TIMER

PFLT = GND (MAX1997 only)

21.8

PFLT unconnected (MAX1997 only)

43.6

Fault Timer Period

PFLT = IN, or MAX1998

87.2

GATE Output Sink Current During Slew

VGATE = 1.5V during turn-on transition

µA

GATE Output Pulldown Resistance

VGATE < 0.5V

200

Ω

GATE Output Pullup Resistance

200

Ω

MAIN STEP-UP REGULATOR

Output Voltage Range

VIN

FREQ = IN

1.5

FREQ unconnected

0.637

0.75

0.863

Operating Frequency

FREQ = GND

0.375

MHz

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