MAX1881 查看數據表（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.)

4.50V

4.00V

3.50V

VCOM BUFFER

LARGE-SIGNAL RESPONSE

MAX1778 toc48

A

4.50V

4.00V

B

3.50V

10µs/div

A. VBUF+ = 3.50V TO 4.50V, 0.5V/div

B. BUFOUT = BUF-, 0.5V/div

CBUF = 1µF, VSUPB = 8V

VCOM BUFFER

LOAD-TRANSIENT RESPONSE

MAX1778 toc49

VCOM BUFFER

LOAD-TRANSIENT RESPONSE

MAX1778 toc50

200mA

500mA

0

A

0

A

-200mA

-500mA

4.2V

4.5V

4.0V

B

4.0V

B

3.8V

3.5V

8.0V

8.0V

C

C

4µs/div

A. IBUFOUT = 200mA PULSES, 200mA/div

B. BUFOUT = BUF-, 200mV/div

C. VMAIN = 8V, 50mV/div

VSUPB = VMAIN, BUF+ = GND, CBUF = 1µF

4µs/div

A. IBUFOUT = 400mA PULSES, 500mA/div

B. BUFOUT = BUF-, 0.5V/div

C. VMAIN = 8V, 100mV/div

VSUPB = VMAIN, BUF+ = GND, CBUF = 1µF

VCOM BUFFER STARTUP

MAX1778 toc51

4V

2V

A

0

4V

2V

B

0

8.1V

C

7.8V

100µs/div

A. RDY, 2V/div

B. BUFOUT = BUF-, CBUF = 1µF, 2V/div

C. VSUPB = VMAIN = 8V, IMAIN = 20mA, 200mV/div

BUF+ = GND

VCOM BUFFER STARTUP

MAX1778 toc51

4V

2V

A

0

4V

2V

B

0

8.1V

C

7.8V

100µs/div

A. RDY, 2V/div

B. BUFOUT = BUF-, CBUF = 1µF, 2V/div

C. VSUPB = VMAIN = 8V, IMAIN = 20mA, 200mV/div

BUF+ = GND

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