MAX1881 Просмотр технического описания (PDF) - Maxim Integrated

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MAX1881

Quad-Output TFT LCD DC-DC Converters with Buffer

Maxim Integrated 

Quad-Output TFT LCD DC-DC

Converters with Buffer

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN = +3.3V, SHDN = IN, VMAIN = VSUPP = VSUPN = VSUPB = VSUPL = 8V, BUF- = BUFOUT,

BUF+ = FLTSET = TGND = PGND = GND, TA = +25°C.)

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

100

80

60

40

20 CLDOOUT = 4.7µF

ILDOOUT = 40mA

0

1

10

100

1000

FREQUENCY (kHz)

REGION OF STABLE CLDOOUT ESR

vs. LOAD CURRENT

100

CLDOOUT = 1µF

10

4OmA

0

LOAD-TRANSIENT RESPONSE

(INTERNAL LINEAR REGULATOR)

MAX1778 toc29

A

1

5.00V

B

STABLE REGION

0.1

4.96V

0.01

0

10

20

30

40

ILDOOUT (mA)

100µs/div

A. ILDO = 100µA TO 40mA, 40mA/div

B. VLDO = 5V, 20mV/div

VSUPL = VLDO + 500mV

LOAD-TRANSIENT RESPONSE NEAR

DROPOUT (INTERNAL LINEAR REGULATOR)

MAX1778 toc30

4OmA

0

A

5.00V

B

4.94V

100µs/div

A. ILDO = 100µA TO 40mA, 40mA/div

B. VLDO = 5V, 20mV/div

VIN = VLDO + 100mV

INTERNAL LINEAR-REGULATOR

RIPPLE REJECTION

MAX1778 toc31

5.0V

A

8.0V

B

1.0A

0.5A

0

C

10µs/div

A. VLDOOUT = 5V, ILDOOUT = 40mA, 10mV/div

B. VMAIN = VSUPL = 8V, 200mV/div

C. IMAIN = 0 TO 750mA, 500mA/div

INTERNAL LINEAR-REGULATOR

STARTUP

MAX1778 toc32

2V

A

0

B

4V

2V

0

C

4V

2V

400µs/div

A. VSHDN = 0 TO 2V, 2V/div

B. VLDOOUT = 5V, RLDOOUT = 125Ω, 2V/div

C. VMAIN = 8V, RMAIN = 40Ω, 2V/div

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