LT3480 查看數據表（PDF） - Linear Technology

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LT3480

36V, 2A, 2.4MHz Step-Down Switching Regulator with 70µA Quiescent Current

Linear Technology 

LT3480

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

range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUN/SS = 10V, VBOOST = 15V, VBD = 3.3V unless otherwise noted. (Note 2)

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

Minimum Input Voltage

l

3

3.6

V

VIN Overvoltage Lockout

Quiescent Current from VIN

Quiescent Current from BD

Minimum Bias Voltage (BD Pin)

VRUN/SS = 0.2V

VBD = 3V, Not Switching

VBD = 0, Not Switching

VRUN/SS = 0.2V

VBD = 3V, Not Switching

VBD = 0, Not Switching

l 36

38

40

V

0.01

0.5

µA

l

30

100

µA

105

160

µA

0.01

0.5

µA

l

80

120

µA

1

5

µA

2.7

3

V

Feedback Voltage

780

790

800

mV

l 775

790

805

mV

FB Pin Bias Current (Note 3)

FB Voltage Line Regulation

Error Amp gm

VFB = 0.8V, VC = 0.4V

4V < VIN < 36V

l

7

30

nA

0.002 0.01

%/V

400

µMho

Error Amp Gain

1000

VC Source Current

VC Sink Current

VC Pin to Switch Current Gain

VC Clamp Voltage

45

µA

45

µA

3.5

A/V

2

V

Switching Frequency

Minimum Switch Off-Time

RT = 8.66k

RT = 29.4k

RT = 187k

2.1

2.4

2.7

MHz

0.9

1

1.15

MHz

160

200

240

kHz

l

60

150

nS

Switch Current Limit

Duty Cycle = 5%

3

3.5

4

A

Switch VCESAT

Boost Schottky Reverse Leakage

Minimum Boost Voltage (Note 4)

ISW = 2A

VBD = 0V

500

mV

0.02

2

µA

l

1.5

2.1

V

BOOST Pin Current

ISW = 1A

22

35

mA

RUN/SS Pin Current

RUN/SS Input Voltage High

VRUN/SS = 2.5V

5

10

µA

2.5

V

RUN/SS Input Voltage Low

0.2

V

PG Threshold Offset from Feedback Voltage

VFB Rising

100

mV

PG Hysteresis

12

mV

PG Leakage

PG Sink Current

SYNC Low Threshold

VPG = 5V

VPG = 0.4V

0.1

1

µA

l 100

600

µA

0.5

V

SYNC High Threshold

0.7

V

SYNC Pin Bias Current

VSYNC = 0V

0.1

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 LT3480E is guaranteed to meet performance specifications

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

temperature range are assured by design, characterization and correlation

with statistical process controls. The LT3480I specifications are

For more information www.linear.com/LT3480

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