LT3479EDE-TRPBF Ver la hoja de datos (PDF) - Linear Technology

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LT3479EDE-TRPBF

3A, Full Featured DC/DC Converter with Soft-Start and Inrush Current Protection

Linear Technology 

LT3479

ELECTRICAL CHARACTERISTICS The l denotes the 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

Minimum Input Voltage

l

2.3

2.5

V

Quiescent Current

Reference Voltage

Reference Voltage Line Regulation

Maximum VREF Pin Current

Soft-Start Pin Current

VIN = 2.5V, VSHDN = 0V

VIN = 2.5V, VSHDN = 2.5V, VC = 0.3V (Not Switching)

Measured at VREF Pin

2.5V < VIN < 24V, VC = 0.3V

Out of Pin

SS = 0.5V, Out of Pin

0.1

1

μA

5

7.5

mA

l 1.216 1.235 1.250

V

0.01 0.03

%/V

100

μA

9

μA

FBP Pin Bias Current

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

250

V/V

Feedback Amplifier Transconductance

150

μS

Feedback Amplifier Sink Current

Feedback Amplifier Source Current

Switching Frequency

Maximum Switch Duty Cycle

SHDN Pin Current

SHDN Pin Threshold

VFBP = 1.25V, VFBN = 1.5V, VC = 0.5V

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

RT = 17.8k

RT = 113k

RT = 1.78k

RT = 17.8k

VSHDN = 5V

VSHDN = 0V

10

μA

10

μA

0.9

1

1.15

MHz

160

200

240

kHz

2.7

3.5

4.1

MHz

l 84

93

%

30

60

μA

0.1

1

μA

0.3

1.5

2

V

Inductor Current Limit

(Note 3)

3.5

5

6.5

A

Switch Current Limit

(Note 3)

3

4.5

6

A

Switch VCESAT

Switch Leakage Current

ISW = 1A (Note 3)

SW = 40V

120

200

mV

0.2

5

μA

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 LT3479 is guaranteed to meet performance specifications

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

temperature range are assured by design, characterization and correlation

with statistical process controls.

Note 3: Inductor Current Limit, Switch Current Limit and Switch VCESAT for

DE package guaranteed by design and/or correlation to static test.

3479fc

3

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