MAX1779 データシートの表示（PDF） - Maxim Integrated

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MAX1779

Low-Power Triple-Output TFT LCD DC-DC Converter

Maxim Integrated 

Low-Power Triple-Output TFT LCD DC-DC

Converter

ABSOLUTE MAXIMUM RATINGS

IN, SHDN, TGND to GND .........................................-0.3V to +6V

DRVN to GND .........................................-0.3V to (VSUPN + 0.3V)

DRVP to GND..........................................-0.3V to (VSUPP + 0.3V)

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

RDY to GND ...........................................................-0.3V to +14V

LX, SUPP, SUPN to PGND .....................................-0.3V to +14V

INTG, REF, FB, FBN, FBP to GND ...............-0.3V to (VIN + 0.3V)

Continuous Power Dissipation (TA = +70°C)

16-Pin TSSOP (derate 9.4mW/°C above +70°C) ..........755mW

Operating Temperature Range

MAX1779EUE ..................................................-40°C to +85°C

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

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

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

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.

ELECTRICAL CHARACTERISTICS

(VIN = +3.0V, SHDN = IN, VSUPP = VSUPN = +10V, TGND = PGND = GND, CREF = 0.22µF, CINTG = 2200pF, TA = 0°C to +85°C,

unless otherwise noted. Typical values are at TA = +25°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

Input Supply Range

VIN

2.7

5.5

V

Input Undervoltage Threshold

IN Quiescent Supply Current

VUVLO

IIN

VIN rising, 40mV hysteresis (typ)

VFB = VFBP = +1.5V, VFBN = -0.2V

2.2

2.4

2.6

V

0.5

1

mA

SUPP Quiescent Current

ISUPP VFBP = +1.5V

0.25 0.55 mA

SUPN Quiescent Current

IN Shutdown Current

SUPP Shutdown Current

ISUPN

VFBN = -0.1V

V SHDN = 0, VIN = +5V

V SHDN = 0, VSUPP = +13V

0.25 0.55 mA

0.1

10

µA

0.1

10

µA

SUPN Shutdown Current

MAIN BOOST CONVERTER

V SHDN = 0, VSUPN = +13V

0.1

10

µA

Output Voltage Range

VMAIN

VIN

13

V

FB Regulation Voltage

VFB

1.235 1.248 1.261

V

FB Input Bias Current

IFB

VFB = +1.25V, INTG = GND

-50

50

nA

Operating Frequency

fOSC

212

250

288

kHz

Oscillator Maximum Duty Cycle

79

85

92

%

Load Regulation

IMAIN = 0 to 50mA, VMAIN = +5V

0.1

%

Line Regulation

0.1

%/V

Integrator Gm

320

µs

LX Switch On-Resistance

LX Leakage Current

RLX(ON)

ILX

ILX = 100mA

VLX = +13V

1.0

2.0

Ω

0.01

20

µA

LX Current Limit

ILIM

Maximum RMS LX Current

350

450

650

mA

250

mA

FB Fault Trip Level

Falling edge

1.07

1.1

1.14

V

POSITIVE CHARGE PUMP

VSUPP Input Supply Range

VSUPP

2.7

13

V

2 _______________________________________________________________________________________

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