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LT3477

3A, DC/DC Converter with Dual Rail-to-Rail Current Sense

Linear Technology 

LT3477

ELECTRICAL CHARACTERISTICS The ● indicates specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 2.5V, VSHDN = 2.5V.

PARAMETER

CONDITIONS

MIN

TYP

MAX UNITS

Soft-Start Pin Current

FBP Pin Bias Current

SS = 0.5V, Out of Pin

9

µA

25

100

nA

FBN Pin Bias Current

25

100

nA

Feedback Amplifier Offset Voltage

Feedback Amplifier Voltage Gain

FBP – FBN, VC = 1V

–2

2

6

mV

500

V/V

Voltage Feedback Amplifier Transconductance

Feedback Amplifier Sink Current

Feedback Amplifier Source Current

Current Sense Amplifier Sense Voltage

VFBP = 1.25V, VFBN = 1.5V, VC = 1V

VFBP = 1.25V, VFBN = 1V, VC = 0.5V

Positive Rail, VCM = 25V, E Grade

Positive Rail, VCM = 25V, I Grade

Ground

● 97.5

● 97.5

88

500

µS

10

µA

10

µA

100

102.5

mV

100

103

mV

100

112

mV

Switching Frequency

Maximum Switch Duty Cycle

Switch Current Limit

RT = 17.2k

RT = 107.4k

RT = 2.44k

RT = 17.2k

(Note 3)

0.9

160

2.7

● 87

3

1

1.15

MHz

200

240

kHz

3.5

4.3

MHz

93

%

4

5

A

Switch VCESAT

Switch Leakage Current

SHDN Pin Current

SHDN Pin Threshold

ISW = 1A (Note 3)

SW = 40V

VSHDN = 5V

VSHDN = 0V

150

200

mV

0.2

5

µA

30

60

µA

0.1

1

µA

0.3

1.5

2

V

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 LT3477E is guaranteed to meet performance specifications

from 0°C to 70°C. Specifications over the – 40°C to 85°C operating

junction temperature range are assured by design, characterization and

correlation with statistical process controls. The LT3477I is guaranteed

over the full –40°C to 125°C operating junction temperature range.

Note 3: Switch current limit and switch VCESAT for UF package guaranteed

by design and/or correlation to static test.

TYPICAL PERFOR A CE CHARACTERISTICS

Switch VCE(SAT)

0.50

0.45

0.40

0.35

125°C

0.30

25°C

0.25

0.20

–50°C

0.15

0.10

0.05

0

0 0.5 1 1.5 2 2.5 3

SWITCH CURRENT (A)

3477 G01

Switch Current Limit

5

4

3

2

1

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3477 G02

VREF

1.27

1.26

1.25

1.24

VIN = 25V

1.23

VIN = 2.5V

1.22

1.21

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3477 G03

3477fb

3

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