MAX8739 データシートの表示（PDF） - Maxim Integrated

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MAX8739

TFT, LCD, DC-DC Converter with Operational Amplifiers

Maxim Integrated 

MAX8739

TFT, LCD, DC-DC Converter with

Operational Amplifiers

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN = 2.5V, VMAIN = 8V, FREQ = IN, TA = +25°C, unless otherwise noted.)

IN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

50

40

SWITCHING

30

20

NOT SWITCHING

10

0

1

2

3

4

5

6

SUPPLY VOLTAGE (V)

IN SUPPLY CURRENT

vs. TEMPERATURE

30

VIN = 3.3V

28

SWITCHING

26

SWITCHING FREQUENCY

vs. INPUT VOLTAGE

1400

FREQ = IN

1200

1000

24

NOT SWITCHING

22

800

FREQ = GND

600

20

-50 -20

10

40

70 100

TEMPERATURE (°C)

400

1

2

3

4

5

6

INPUT VOLTAGE (V)

STEP-UP REGULATOR SOFT-START

(HEAVY LOAD)

A

0V

B

0V

STEP-UP REGULATOR

LOAD-TRANSIENT RESPONSE

0V

A

B

2ms/div

A: VIN, 2V/div

B: VMAIN, 5V/div

C: INDUCTOR CURRENT, 1A/div

C

0A

OA

C

OA

20µs/div

A: VMAIN, AC-COUPLED, 200mV/div

B: INDUCTOR CURRENT, 500mA/div

C: LOAD CURRENT, 500mA/div

STEP-UP REGULATOR PULSED

LOAD-TRANSIENT RESPONSE

A

0V

B

0A

C

OA

20µs/div

A: VMAIN, AC-COUPLED, 200mV/div

B: INDUCTOR CURRENT, 500mA/div

C: LOAD CURRENT, 500mA/div

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