LT1579CGN-5 datasheet(7/20 Pages) LINER

Part #	LT1579CGN-5

Description	300mA Dual Input Smart Battery Backup Regulator

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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7

LT1579

TYPICAL PERFORMANCE CHARACTERISTICS

Logic Flag Output Voltage

(Output Low)

Logic Flag Output Voltage

(Output Low)

TEMPERATURE (

°C)

–50

0.8

1.0

1.2

25

75

1579 G21

0.6

0.4

–25

0

50

100

125

0.2

0

ISINK = 5mA

ISINK = 20µA

LOGIC FLAG SINK CURRENT

0.2

0.4

0.6

0.5

0.8

1.0

0.1

0.3

0.7

0.9

1

µA10µA

100

µA

1mA

10mA

1579 G20

0

OUTPUT CURRENT (mA)

0

3

4

5

150

250

1579 G37

2

1

0

50

100

200

6

7

8

300

VIN1 = VIN2 = VOUT(NOMINAL) + 1V

Ground Pin Current

Minimum Input Voltage

TEMPERATURE (

°C)

–50

2.0

2.1

2.3

2.4

2.5

3.0

2.7

0

50

75

1579 G14

2.2

2.8

2.9

2.6

–25

25

100

125

Shutdown Pin Threshold

TEMPERATURE (

°C)

–50 – 25

0

0.4

1.0

0

50

75

1579 G15

0.2

0.8

0.6

25

100

125

ILOAD = 1mA

Secondary Select Threshold

(Switch to VIN1)

TEMPERATURE (

°C)

–50

0

0.2

0.6

0.8

1.0

2.0

1.4

0

50

75

1579 G18

0.4

1.6

1.8

1.2

–25

25

100

125

ILOAD = 300mA

ILOAD = 1mA

Secondary Select Threshold

(Switch to VIN2)

TEMPERATURE (

°C)

–50

0

0.2

0.6

0.8

1.0

2.0

1.4

0

50

75

1579 G17

0.4

1.6

1.8

1.2

–25

25

100

125

ILOAD = 1mA

TEMPERATURE (

°C)

–50 – 25

0

1.0

2.5

0

50

75

1579 G16

0.5

2.0

1.5

25

100

125

VSHDN = 0V

Shutdown Pin Current

Secondary Select Pin Current

TEMPERATURE (

°C)

–50

0

0.1

0.3

0.4

0.5

1.0

0.7

0

50

75

1579 G19

0.2

0.8

0.9

0.6

–25

25

100

125

VSS = 0V

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LT1579CGN-5 Datasheet(PDF) 7 Page - Linear Technology

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