Step-Up Regulator with Switch Control and

Operational Amplifier for TFT LCD

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7

STEP-UP REGULATOR PULSED LOAD

TRANSIENT RESPONSE

MAX8758 toc09

20

μs/div

AC-COUPLED

200mV/div

L = 4.7

μH

Ω

1A/div

1AV/div

TIMER-DELAY LATCH RESPONSE

TO OVERLOAD

MAX8758 toc10

20ms/div

5V/div

LX

5V/div

2A/div

0A

0V

0V

SUPB SUPPLY CURRENT

vs. SUPB VOLTAGE

4.5

6.0

7.5

9.0

10.5

12.0

13.5

15.0

0.10

0.15

0.20

0.25

0.30

NO LOAD

BUFFER CONFIGURATION

SUPB SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

-40

-10

20

50

70

0.10

0.15

0.20

0.25

0.30

NO LOAD

BUFFER CONFIGURATION

OPERATIONAL AMPLIFIER FREQUENCY

FREQUENCY (Hz)

10k

1k

-40

-30

-20

-10

0

10

-50

100

100k

Ω

1000pF

56pF

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

FREQUENCY (Hz)

100k

10k

1k

100

10

20

40

60

80

100

120

0

11M

OP-AMP RAIL-TO-RAIL INPUT/OUTPUT

MAX8758 toc15

100

μs/div

5V/div

5V/div

OP-AMP LOAD TRANSIENT RESPONSE

MAX8758 toc16

1

μs/div

50mA/div

0

2V/div

Typical Operating Characteristics (continued)