MAX8739 데이터 시트보기 (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.)

TIMER DELAY LATCH

RESPONSE TO OVERLOAD

53ms

10ms/div

A: VIN, 2V/div

B: VMAIN, 5V/div

C: INDUCTOR CURRENT, 2A/div

POWER-UP SEQUENCE

A

0V

B

0V

C

OA

A: VLDO, 5V/div

B: VMAIN, 5V/div

C: VSRC, 20V/div

D: VGON, 20V/div

E: VGOFF, 5V/div

2ms/div

10

A

B

8

SUP SUPPLY CURRENT

vs. SUP VOLTAGE

SWITCHING

C

6

D

4

2

E

NOT SWITCHING

0

4

6

8

10

12

SUP VOLTAGE (V)

SUP SUPPLY CURRENT

vs. TEMPERATURE

10

VSUP = 8V

VIN = 3.3V

8

SWITCHING

6

4

NOT SWITCHING

2

0

-50 -20

10

40

70 100

TEMPERATURE (°C)

OPERATIONAL-AMPLIFIER

FREQUENCY RESPONSE

4

BUFFER CONFIGURATION

2

0

-2

-4

-6 RL = 10kΩ

-8

CL = 1000pF

AV = 1

-10

VSUP = 8V

100k

1M

10M

FREQUENCY (Hz)

OPERATIONAL-AMPLIFIER RAIL-TO-RAIL

INPUT/OUTPUT

BUFFER CONFIGURATION

A

0V

B

0A

10µs/div

A: BUFFER INPUT, 5V/div

B: BUFFER OUTPUT, 5V/div

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