Typical operating characteristics (continued) – Rainbow Electronics MAX1885 User Manual

Page 15

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MAX1778/MAX1880–MAX1885

Quad-Output TFT LCD DC-DC

Converters with Buffer

______________________________________________________________________________________

15

0

-0.6

-0.2

0.2

0.6

1.0

-40

10

-15

35

60

85

MAX1778 toc39

TEMPERATURE (

°C)

V

OS

(mV)

INPUT OFFSET VOLTAGE DEVIATION

vs. TEMPERATURE

V

SUPB

= 13V

V

CM

= V

SUPB

/ 2

0

-0.6

-0.2

0.2

0.6

1.0

-40

10

-15

35

60

85

MAX1778 toc39

TEMPERATURE (

°C)

V

OS

(mV)

INPUT OFFSET VOLTAGE DEVIATION

vs. TEMPERATURE

V

SUPB

= 13V

V

CM

= V

SUPB

/ 2

0

2

6

4

8

10

0

4

2

6

8

10

12

14

MAX1778 toc41

V

CM

(V)

I

BIAS

(nA)

BUFFER INPUT BIAS CURRENT

vs. COMMON-MODE VOLTAGE

V

SUPB

= 4.5V

V

SUPB

= 13V

4

6

8

10

4

8

6

10

12

14

MAX1778 toc42

V

SUPB

(V)

I

BIAS

(nA)

BUFFER INPUT BIAS CURRENT
vs. BUFFER SUPPLY VOLTAGE

V

CM

= V

SUPB

/ 2

4

5

6

7

8

9

10

11

12

-40

-15

10

35

60

85

MAX1778 toc43

TEMPERATURE (

°C)

I

BIAS

(nA)

BUFFER INPUT BIAS CURRENT

vs. TEMPERATURE

V

CM

= V

SUPB

/ 2

0.30

0.34

0.42

0.38

0.46

0.50

0

4

2

6

8

10

12

14

MAX1778 toc44

V

CM

(V)

I

SUPB

(mA)

BUFFER SUPPLY CURRENT

vs. COMMON-MODE VOLTAGE

V

SUPB

= 4.5V

V

SUPB

= 13V

0.30

0.34

0.38

0.42

0.46

0.50

4

8

6

10

12

14

MAX1778 toc45

V

SUPB

(V)

I

SUPB

(mA)

BUFFER SUPPLY CURRENT

vs. BUFFER SUPPLY VOLTAGE

V

CM

= V

SUPB

/ 2

0

0.3

0.2

0.1

0.4

0.5

0.6

0.7

0.8

0.9

1.0

-40

10

-15

35

60

85

I

SUPB

(mA)

MAX1778 toc46

TEMPERATURE (

°C)

NO-LOAD BUFFER SUPPLY CURRENT

vs. TEMPERATURE

V

SUPB

= 13V

V

CM

= V

SUPB

/ 2

MAX1778 toc47

B

A

4.00V

3.95V

4.05V

4.00V

3.95V

4.05V

4

µs/div

VCOM BUFFER

SMALL-SIGNAL RESPONSE

A. V

BUF+

= 3.95V TO 4.05V, 50mV/div

B. BUFOUT = BUF-, 50mV/div
C

BUF

= 1

µF, V

SUPB

= 8V

Typical Operating Characteristics (continued)

(Circuit of Figure 1, V

IN

= +3.3V, SHDN = IN, V

MAIN

= V

SUPP

= V

SUPN

= V

SUPB

= V

SUPL

= 8V, BUF- = BUFOUT,

BUF+ = FLTSET = TGND = PGND = GND, T

A

= +25°C.)

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