MAX8740 datasheet(2/12 Pages) MAXIM

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TFT-LCD Step-Up DC-DC Converter

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = VSHDN = 3V, 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.

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

IN, SHDN, FREQ, FB to GND ...................................-0.3V to +6V

COMP, SS to GND .......................................-0.3V to (VIN + 0.3V)

LX Switch Maximum Continuous RMS Current .....................2.4A

Continuous Power Dissipation (TA = +70

°C)

10-Pin TDFN (derate 24.1mW/

°C above +70°C).......1481.5mW

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

°C to +85°C

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

°C

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

°C to +160°C

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

°C

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VOUT < 18V

2.6

5.5

Input Voltage Range

18V < VOUT < 24V

4.0

5.5

Output Voltage Range

IN Undervoltage-Lockout

Threshold

VIN rising, typical hysteresis is 50mV; LX remains off

below this level

2.20

2.38

2.57

VFB = 1.3V, not switching

0.22

0.44

IN Quiescent Current

VFB = 1.0V, switching, FREQ = GND

IN Shutdown Current

SHDN = GND

0.1

10.0

µA

ERROR AMPLIFIER

FB Regulation Voltage

Level to produce VCOMP = 1.24V

1.22

1.24

1.26

FB Input Bias Current

VFB = 1.24V

125

250

FB Line Regulation

Level to produce VCOMP = 1.24V, VIN = 2.6V to 5.5V

0.05

0.15

%/V

Transconductance

100

200

315

µS

Voltage Gain

2400

V/V

OSCILLATOR

FREQ = GND

540

640

740

Frequency

FREQ = IN

1000

1220

1500

kHz

Maximum Duty Cycle

n-CHANNEL MOSFET

Current Limit

VFB = 1V, 71% duty cycle

3.9

4.6

5.3

VIN = 3V (typ value at TA = +25°C)

0.11

0.17

On-Resistance

VIN = 5V (typ value at TA = +25°C)

0.095

0.15

Ω

Leakage Current

VLX = 28V

µA

Current-Sense Transresistance

0.09

0.15

0.25

V/A

SOFT-START

Reset Switch Resistance

100

Ω

Charge Current

VSS = 1.2V

2.5

4.5

7.5

µA

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