LT3980IMSE-TRPBF データシートの表示（PDF） - Linear Technology

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LT3980IMSE-TRPBF

58V, 2A, 2.4MHz Step-Down Switching Regulator with 85µA Quiescent Current

Linear Technology 

LT3980

Electrical Characteristics The ● 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

Quiescent Current from BD

Feedback Voltage

FB Pin Bias Current (Note 3)

FB Voltage Line Regulation

Error Amp gm

Error Amp Gain

CONDITIONS

VRUN/SS = 0.2V

VBD = 3V, Not Switching

VBD = 0, Not Switching

VFB = 0.8V, VC = 1.2V

4V < VIN < 56V

MIN

55

782

● 770

●

TYP MAX

0.01 0.5

82

115

1

5

790 798

790 805

10

40

0.002 0.01

500

1800

UNITS

µA

µA

µA

mV

mV

nA

%/V

µmho

VC Source Current

VC Sink Current

VC Pin to Switch Current Gain

VC Clamp Voltage

Switching Frequency

Minimum Switch Off-Time

Switch Current Limit

Switch VCESAT

DA Pin Current to Pause OSC

Boost Schottky Reverse Leakage

Minimum Boost Voltage (Note 4)

BOOST Pin Current

RUN/SS Pin Current

RUN/SS Input Voltage High

RUN/SS Input Voltage Low

PG Threshold Offset from Feedback Voltage

PG Hysteresis

PG Leakage

PG Sink Current

SYNC Threshold

RT = 8.66k

RT = 29.4k

RT = 187k

Duty Cycle = 5%

ISW = 2A

VBD = 0V

ISW = 2A

VRUN/SS = 2.5V

VFB Rising

VPG = 5V

VPG = 0.4V

60

µA

60

µA

3.87

A/V

2

V

1.95 2.25 2.55

MHz

0.86 1.07 1.27

MHz

195

225

255

kHz

●

140 230

nS

3.3

4

4.9

A

540

mV

1.9

2.4

3

A

0.02

2

µA

●

1.7

2.2

V

40

55

mA

6

10

µA

2.5

V

● 0.4

V

● 50

65

80

mV

14

mV

0.1

1

µA

● 200

700

µA

0.575 0.675 0.775

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 LT3980E 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 LT3980I specifications are

guaranteed over the –40°C to 125°C temperature range. The LT3980H

specifications are guaranteed over the –40°C to 150°C operating

temperature range. High junction temperatures degrade operating

lifetimes. Operating lifetime is derated at junction temperatures greater

than 125°C.

Note 3: Bias current flows out of the FB pin.

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

guarantee full saturation of the switch.

Note 5: Absolute Maximum at VIN and RUN/SS pins is 80V for non-

repetitive 1 minute transients, and 60V for continuous operation.

3980fa

For more information www.linear.com/LT3980

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