Rainbow-electronics MAX8727 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX8727

TFT-LCD Step-Up DC-DC Converter

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ELECTRICAL CHARACTERISTICS (continued)

= V

SHDN

= 3V, FREQ = GND, T

= 0°C to +85°C. Typical values are at T

= +25°C, unless otherwise noted.) (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNITS

CONTROL INPUTS

SHDN, FREQ Input Low Voltage V

= 2.6V to 5.5V

0.3 ×

SHDN, FREQ Input High Voltage V

= 2.6V to 5.5V

0.7 ×

SHDN, FREQ Input Hysteresis V

= 2.6V to 5.5V

0.1 ×

FREQ Pulldown Current 2.3 6.0 9.5 µA

SHDN Input Current SHDN = GND 0.001 1 µA

ELECTRICAL CHARACTERISTICS

= V

SHDN

= 3V, FREQ = GND, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNITS

OUT

< 18V 2.6 5.5

Input Voltage Range

18V < V

OUT

< 24V 4.0 5.5

Output Voltage Range 24 V

IN Undervoltage-Lockout

Threshold

rising, typical hysteresis is 50mV 2.20 2.57 V

= 1.3V, not switching 0.44

IN Quiescent Current

= 1.0V, switching 5

IN Shutdown Current SHDN = GND 10 µA

ERROR AMPLIFIER

FB Regulation Voltage Level to produce V

COMP

= 1.24V 1.215 1.260 V

FB Input Bias Current V

= 1.24V 250 nA

FB Line Regulation Level to produce V

COMP

= 1.24V, V

= 2.6V to 5.5V 0.15 %/V

Transconductance 100 300 µS

Shutdown FB Input Voltage SHDN = GND 0.05 0.15 V

OSCILLATOR

FREQ = GND 490 770

Frequency

FREQ = IN 900 1600

kHz

Maximum Duty Cycle 86 94 %

n-CHANNEL MOSFET

Current Limit V

= 1V, 75% duty cycle 3.0 5.1 A

On-Resistance 250 mΩ

Current-Sense Transresistance 0.11 0.31 V/A

SOFT-START

Reset Switch Resistance 100 Ω

Charge Current V

= 1.2V 2.5 7.5 µA

1 2 3 4 5 6 7 8 ... 12 13

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