Rainbow-electronics MAX8727 Manual do Utilizador descarregar pdf (Página 4)

MAX8727

TFT-LCD Step-Up DC-DC Converter

4 _______________________________________________________________________________________

Note 1: Specifications to -40°C are guaranteed by design, not production tested.

ELECTRICAL CHARACTERISTICS (continued)

= V

SHDN

= 3V, FREQ = GND, T

= -40°C to +85°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 ×

EFFICIENCY vs. LOAD CURRENT

(1.2MHz OPERATION)

MAX8727 toc01

LOAD CURRENT (mA)

EFFICIENCY (%)

10010

100

11000

L = 3.6

= 5.0V

= 3.3V

EFFICIENCY vs. LOAD CURRENT

(640kHz OPERATION)

MAX8727 toc02

LOAD CURRENT (mA)

EFFICIENCY (%)

10010

100

1 1000

L = 6.8

= 5.0V

= 3.3V

LOAD REGULATION

MAX8727 toc03

LOAD CURRENT (mA)

LOAD REGULATION (%)

10010

-1.5

-1.0

-0.5

0.5

-2.0

1 1000

= 5.0V

= 3.3V

SWITCHING FREQUENCY

vs. INPUT VOLTAGE

MAX8727 toc04

INPUT VOLTAGE (V)

SWITCHING FREQUENCY (kHz)

5.04.54.03.53.0

600

700

800

900

1000

1100

1200

1300

1400

500

2.5 5.5

FREQ = IN

FREQ = GND

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX8727 toc05

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

5.04.54.03.53.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

2.5 5.5

SWITCHING

NONSWITCHING

SUPPLY CURRENT vs. TEMPERATURE

(SWITCHING)

MAX8727 toc06

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

806040200-20

-40 100

= 5.0V

= 3.3V

Typical Operating Characteristics

(Circuit of Figure 1. V

= 5V, V

MAIN

= 15V, T

= +25°C unless otherwise noted.)

1 2 3 4 5 6 7 8 9 ... 12 13

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