LT3973IMSE-3.3-TRPBF 查看數據表（PDF） - Linear Technology

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LT3973IMSE-3.3-TRPBF

42V, 750mA Step-Down Regulator with 2.5µA Quiescent Current and Integrated Diodes

Linear Technology 

LT3973/LT3973-3.3/LT3973-5

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LT3973EDD-5#PBF

LT3973EDD-5#TRPBF LGGF

10-Lead (3mm × 3mm) Plastic DFN

–40°C to 125°C

LT3973IDD-5#PBF

LT3973IDD-5#TRPBF LGGF

10-Lead (3mm × 3mm) Plastic DFN

–40°C to 125°C

LT3973HDD-5#PBF

LT3973HDD-5#TRPBF LGGF

10-Lead (3mm × 3mm) Plastic DFN

–40°C to 150°C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping

container.Consult LTC Marketing for information on non-standard lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBD = 3.3V unless otherwise noted. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Input Voltage (Note 3)

l

3.8

4.2

V

Quiescent Current from VIN

LT3973 Feedback Voltage

VEN/UVLO Low

VEN/UVLO High

VEN/UVLO High, –40°C to 125°C

VEN/UVLO High, –40°C to 150°C

0.75

1.3

µA

1.8

2.8

µA

l

6

µA

l

12

µA

1.195

1.21

1.225

V

l 1.185

1.21

1.235

V

LT3973-3.3 Output Voltage

3.26

3.3

3.34

V

l 3.234

3.3

3.366

V

LT3973-5 Output Voltage

4.94

5

5.06

V

l 4.9

5

5.1

V

LT3973 FB Pin Bias Current

FB/Output Voltage Line Regulation

Switching Frequency

Switch Current Limit

Catch Schottky Current Limit

Switch VCESAT

Switch Leakage Current

VFB = 1.21V

4.2V < VIN < 40V

RT = 41.2k, VIN = 6V

RT = 158k, VIN = 6V

RT = 768k, VIN = 6V

VIN = 5V, VFB = 0V

VIN = 5V

ISW = 500mA

l

0.1

20

nA

0.0002 0.01

%/V

1.72

2.15

2.58

MHz

632

790

948

kHz

156

195

234

kHz

l 1.237

1.65

1.98

A

l 0.92

1.15

1.44

A

250

mV

0.05

2

µA

Catch Schottky Forward Voltage

Catch Schottky Reverse Leakage

Boost Schottky Forward Voltage

Boost Schottky Reverse Leakage

Minimum Boost Voltage (Note 4)

BOOST Pin Current

Dropout Comparator Threshold

Dropout Comparator Hysteresis

ISCH = 200mA, VIN = VBD = NC

VSW = 12V

ISCH = 50mA, VIN = NC, VBOOST = 0V

VREVERSE = 12V

VIN = 5V

ISW = 500mA, VBOOST = 15V

(VIN - OUT) Falling, VIN = 5V

550

mV

0.05

2

µA

820

mV

0.02

2

µA

l

1.4

1.8

V

10

13

mA

l 400

490

580

mV

40

mV

For more information www.linear.com/LT3973

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