Rainbow-electronics MAX8727 Bedienungsanleitung PDF herunterladen (Seite 2)

MAX8727

TFT-LCD Step-Up DC-DC Converter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= V

SHDN

= 3V, FREQ = GND, T

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

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

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 +26V

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

COMP, SS to GND .........................................-0.3V to V

+ 0.3V

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

Continuous Power Dissipation (T

= +70°C)

10-Pin Thin DFN (derate 24.4mW/°C above +70°C) ....1951mW

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

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 2.38 2.57 V

= 1.3V, not switching 0.225 0.440

IN Quiescent Current

= 1.0V, switching 2 5

IN Shutdown Current SHDN = GND 0.1 10.0 µA

ERROR AMPLIFIER

FB Regulation Voltage Level to produce V

COMP

= 1.24V 1.22 1.24 1.26 V

FB Input Bias Current V

= 1.24V 50 125 250 nA

FB Line Regulation Level to produce V

COMP

= 1.24V, V

= 2.6V to 5.5V 0.05 0.15 %/V

Transconductance 100 200 300 µS

Voltage Gain 700 V/V

Shutdown FB Input Voltage SHDN = GND 0.05 0.10 0.15 V

OSCILLATOR

FREQ = GND 540 640 740

Frequency

FREQ = IN 1000 1220 1500

kHz

Maximum Duty Cycle 87 90 93 %

n-CHANNEL MOSFET

Current Limit V

= 1V, 75% duty cycle 3.0 3.8 4.6 A

On-Resistance 125 250 Ω

Leakage Current V

= 24V 30 45 µA

Current-Sense Transresistance 0.11 0.21 0.31 V/A

SOFT-START

Reset Switch Resistance 100 Ω

Charge Current V

= 1.2V 2.5 4.5 7.5 µA

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

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