LT3970IMS-3.3-TRPBF 查看數據表（PDF） - Linear Technology

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LT3970IMS-3.3-TRPBF

40V, 350mA Step-Down Regulator with 2.5µA Quiescent Current and Integrated Diodes

Linear Technology 

LT3970/LT3970-3.3/LT3970-5

ELECTRICAL CHARACTERISTICS

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LT3970E is guaranteed to meet performance specifications

from 0°C to 125°C junction temperature. Specifications over the –40°C

to 125°C operating junction temperature range are assured by design,

characterization, and correlation with statistical process controls. The

LT3970I is guaranteed over the full –40°C to 125°C operating junction

temperature range. The LT3970H is guaranteed over the full –40°C to

150°C operating junction temperature range. High junction temperatures

degrade operating lifetimes. Operating lifetime is derated at junction

temperatures greater than 125°C.

Note 3: Bias current flows into the FB pin.

Note 4: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the switch.

TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.

Efficiency, VOUT = 3.3V

90

80

VIN = 24V

70

VIN = 12V

60

VIN = 36V

50

40

30

20

0.01

FRONT PAGE APPLICATION

VOUT = 3.3V

R1 = 1M

R2 = 576k

0.1

1

10

LOAD CURRENT (mA)

100

3970 G01

Efficiency, VOUT = 5V

90

FRONT PAGE APPLICATION

80

VIN = 24V

70

VIN = 12V

60

VIN = 36V

50

40

30

0.01

0.1

1

10

LOAD CURRENT (mA)

100

3970 G02

LT3970 Feedback Voltage

1.220

1.215

1.210

1.205

1.200

1.195

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3970 G03

LT3970-3.3 Output Voltage

3.32

3.31

3.30

LT3970-5 Output Voltage

5.04

5.02

5.00

3.29

3.28

3.27

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3970 G03a

4.98

4.96

4.94

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3970 G03b

No-Load Supply Current

4.0

FRONT PAGE APPLICATION

VOUT = 3.3V

3.5

R1 = 1MΩ

R2 = 576k

LT3970-5

LT3970-3.3

3.0

2.5

2.0

1.5

5

10 15 20 25 30 35 40

INPUT VOLTAGE (V)

3970 G04

3970fa

4

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