MAX8727(2004) 查看數據表（PDF） - Maxim Integrated

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MAX8727
(Rev.:2004)

TFT-LCD Step-Up DC-DC Converter

Maxim Integrated 

TFT-LCD Step-Up DC-DC Converter

ELECTRICAL CHARACTERISTICS (continued)

(VIN = VSHDN = 3V, FREQ = GND, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)

PARAMETER

CONDITIONS

MIN TYP MAX

CONTROL INPUTS

SHDN, FREQ Input Low Voltage VIN = 2.6V to 5.5V

0.3 ×

VIN

SHDN, FREQ Input High Voltage VIN = 2.6V to 5.5V

0.7 ×

VIN

SHDN, FREQ Input Hysteresis

VIN = 2.6V to 5.5V

0.1 ×

VIN

FREQ Pulldown Current

SHDN Input Current

SHDN = GND

2.3

6.0

9.5

0.001

1

UNITS

V

V

V

µA

µA

ELECTRICAL CHARACTERISTICS

(VIN = VSHDN = 3V, FREQ = GND, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER

Input Voltage Range

Output Voltage Range

VOUT < 18V

18V < VOUT < 24V

CONDITIONS

IN Undervoltage-Lockout

Threshold

IN Quiescent Current

IN Shutdown Current

ERROR AMPLIFIER

FB Regulation Voltage

FB Input Bias Current

FB Line Regulation

Transconductance

Shutdown FB Input Voltage

OSCILLATOR

Frequency

Maximum Duty Cycle

n-CHANNEL MOSFET

Current Limit

On-Resistance

Current-Sense Transresistance

SOFT-START

Reset Switch Resistance

Charge Current

VIN rising, typical hysteresis is 50mV

VFB = 1.3V, not switching

VFB = 1.0V, switching

SHDN = GND

Level to produce VCOMP = 1.24V

VFB = 1.24V

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

SHDN = GND

FREQ = GND

FREQ = IN

VFB = 1V, 75% duty cycle

VSS = 1.2V

MIN TYP MAX UNITS

2.6

5.5

V

4.0

5.5

24

V

2.20

2.57

V

0.44

mA

5

10

µA

1.215

100

0.05

1.260

V

250

nA

0.15 %/V

300

µS

0.15

V

490

770

kHz

900

1600

86

94

%

3.0

5.1

A

250

mΩ

0.11

0.31

V/A

100

Ω

2.5

7.5

µA

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