LT3990IMS datasheet(5/20 Pages) LINER

Part #	LT3990IMS

Description	60V, 350mA Step-Down Regulator with 2.5關A Quiescent Current and Integrated Diodes

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT3990

5

3990p

TYPICAL PERFORMANCE CHARACTERISTICS

Minimum

Switch On-Time/Switch Off-Time

Switch VCESAT (ISW = 200mA)

vs Temperature

Switch VCESAT

BOOST Pin Current

Minimum Input Voltage,

VOUT = 3.3V

Minimum Input Voltage,

VOUT = 5V

Switch Current Limit

Switching Frequency

TA = 25°C, unless otherwise noted.

DUTY CYCLE (%)

0

200

300

400

500

600

700

800

20

40

60

80

3990 G10

100

SWITCH PEAK

CURRENT LIMIT

CATCH DIODE VALLEY CURRENT LIMIT

TEMPERATURE ( C)

–50

200

300

400

500

600

050

100

150

3990 G11

700

800

–25

25

75

125

SWITCH PEAK CURRENT LIMIT

CATCH DIODE VALLEY CURRENT LIMIT

TEMPERATURE (°C)

–50

0

0.4

0.8

1.2

1.6

2.4

–25

025

50

75

3990 G12

100 125 150

2.0

0.2

0.6

1.0

1.4

2.2

1.8

TEMPERATURE (°C)

–50

0

20

60

80

100

200

140

0

50

75

3990 G13

40

160

180

120

–25

25

100 125

150

MINIMUM OFF-TIME

LOAD CURRENT = 175mA

MINIMUM ON-TIME

TEMPERATURE (°C)

–50

200

250

300

350

–25

0

25

50

3990 G14

75

100 125 150

SWITCH CURRENT (mA)

0

300

400

500

400

3990 G15

200

100

0

100

200

300

500

SWITCH CURRENT (mA)

0

10

12

14

400

3990 G16

8

6

100

200

300

500

4

2

0

LOAD CURRENT (mA)

050

2.5

3.5

5.0

100

200

250

3990 G17

3.0

4.5

4.0

150

300

350

FRONT PAGE APPLICATION

VOUT = 3.3V

TO START

TO RUN

LOAD CURRENT (mA)

050

4.0

5.0

6.5

100

200

250

3990 G17

4.5

6.0

5.5

150

300

350

FRONT PAGE APPLICATION

VOUT = 5V

TO START

TO RUN

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