LTC3255_15 datasheet(4/16 Pages) LINER

Part #	LTC3255

Description	Wide VIN Range Fault Protected 50mA Step-Down Charge Pump

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LTC3255

4

3255f

For more information www.linear.com/LTC3255

TYPICAL PERFORMANCE CHARACTERISTICS

FB Pin Regulation Voltage

vs Input Voltage (IOUT = 1mA)

FB Pin Regulation Voltage

vs Input Voltage (IOUT = 50mA)

FB Pin Regulation Voltage

vs Temperature

Operating Mode Transition

Voltage vs Input Voltage

(IOUT = 5mA)

Operating Mode Transition

Voltage vs Input Voltage

(IOUT = 50mA)

Typical Minimum VIN – 2 • VOUT

Compliance Required for Shunt

Mode Operation

Input Operating Current

vs Input Voltage

Input Operating Current

vs Temperature

Input Shutdown Current

vs Input Voltage

TA = 25°C, unless otherwise noted.

VIN (V)

5

0

5

15

20

25

50

35

15

25 30

50

3255 G01

10

40

45

30

10

20

35 40 45

SHUNT = GND

VOUT = 5V

TA = 25°C

TEMPERATURE (°C)

–60

0

5

15

20

25

50

35

0

60

90

120

3255 G02

10

40

45

30

–30

30

150

VIN = 12V

VOUT = 5V

SHUNT = GND

VIN (V)

0

5

10

15

20

30

10

20

30

40

3255 G03

50

60

150°C

25

EN = GND

125°C

–55°C

25°C

VIN (V)

5

1.200

1.208

1.216

1.224

25

3255 G04

1.192

1.184

1.196

1.204

1.212

1.220

1.188

1.180

1.176

10 15 20

30 35 40 45 50

IOUT = 1mA

VOUT = 5V

SHUNT = GND

–60°C

25°C

105°C

150°C

VIN (V)

5

1.200

1.208

1.216

1.224

25

3255 G05

1.192

1.184

1.196

1.204

1.212

1.220

1.188

1.180

1.176

10 15 20

30 35 40 45 50

IOUT = 50mA

VOUT = 5V

SHUNT = GND

–60°C

25°C

105°C

TEMPERATURE (°C)

–60

1.192

1.216

1.220

1.224

0

60

90

3255 G06

1.184

1.208

1.200

1.188

1.212

1.176

1.180

1.204

1.196

–30

30

120 150

VIN = 12V

IOUT = 1mA

VOUT = 5V

VOUT (V)

2

17

21

25

10

3255 G07

13

9

15

19

23

11

7

5

4

6

8

3

11

5

7

9

12

SHUNT = GND

2:1 MODE

1:1 MODE

TRANSITION

REGION

•

VOUT (V)

2

17

21

25

10

3255 G08

13

9

15

19

23

11

7

5

4

6

8

3

11

5

7

9

12

SHUNT = GND

2:1 MODE

1:1 MODE

TRANSITION

REGION

•

TEMPERATURE (°C)

–60

2.5

2.6

2.8

2.9

3.0

3.5

3.2

0

60

90

120

3255 G09

2.7

3.3

3.4

3.1

–30

30

150

IVIN = 20mA

VOUT = 2.5V

VOUT = 3.3V

VOUT = 5V

VOUT = 12V

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