MAX188 datasheet(2/32 Pages) MAXIM

2 / 32 page

Triple-Output TFT LCD Power Supply

with Fault Protection

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = 3V, SHDN = IN, CREF = 0.22µF, PGND = GND, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.)

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, OCN, OCP,

FB, FBP, FBN, FREQ to GND ...............................-0.3V to +6V

PGND to GND.....................................................................±0.3V

LX to PGND ............................................................-0.3V to +14V

DRVP to GND .........................................................-0.3V to +30V

REF, GATE, TGND to GND ..........................-0.3V to (VIN + 0.3V)

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

Continuous Power Dissipation (TA = +70°C)

16-Pin QFN (derate 19.2mW/°C above +70°C) .........1538mW

Operating Temperature Range

MAX1889EGE ..................................................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

IN Supply Range

VIN

2.7

5.5

VIN rising

2.55

2.7

2.85

IN Undervoltage Lockout

(UVLO) Threshold

VUVLO

350mV typical

hysteresis

VIN falling

2.2

2.35

2.5

IN Quiescent Current

IIN

VFB = VFBP = 1.5V, VFBN = 0V (Note 1)

1.0

IN Shutdown Current

VSHDN = 0, VIN = 5V

0.1

1.0

µA

REF Output Voltage

VREF

-2µA < IREF < 50µA

1.231

1.250

1.269

Thermal Shutdown

160

°C

MAIN STEP-UP REGULATOR

Main Output Voltage Range

VMAIN

VIN

VFREQ = VIN

0.85

1.15

MHz

Operating Frequency

fOSC

VFREQ = 0V

500

kHz

Oscillator Maximum Duty Cycle

FB Regulation Voltage

VFB

ILX = 200mA, slope = 0 (Note 2)

1.229

1.242

1.254

FB Fault Trip Level

VFB falling

0.95

1.0

1.05

Load Regulation

IMAIN = 0 to full load

-1.6

Line Regulation

VIN = 2.7V to 5.5V

0.2

%/V

FB Input Bias Current

IFB

VFB = 1.5V

-100

+100

LX Switch On-Resistance

RLX(ON)

250

450

Ω

LX Leakage Current

ILX

VLX = 13V

0.01

µA

LX Current Limit

ILIM

1.6

2.1

2.8

LX RMS Current Rating

Not tested

1.4

Soft-Start Period

tSS

4096 /

fOSC

Soft-Start Step Size

VREF /32

POSITIVE LINEAR-REGULATOR CONTROLLER

FBP Regulation Voltage

VFBP

IDRVP = 0.2mA

1.213

1.25

1.288

FBP Fault Trip Level

VFBP falling

0.96

1.0

1.04

FBP Input Bias Current

IFBP

VFBP = 1.25V

-50

+50

FBP Effective Transconductance

VDRVP = 10V, IDRVP = 0.1mA to 2mA

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