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LT3980

3980fa

For more information www.linear.com/LT3980

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Quiescent Current from BD

VRUN/SS = 0.2V

VBD = 3V, Not Switching

VBD = 0, Not Switching

0.01

0.5

115

µA

Feedback Voltage

●

782

770

790

798

805

FB Pin Bias Current (Note 3)

VFB = 0.8V, VC = 1.2V

●

FB Voltage Line Regulation

4V < VIN < 56V

0.002

0.01

%/V

Error Amp gm

500

µmho

Error Amp Gain

1800

VC Source Current

µA

VC Sink Current

µA

VC Pin to Switch Current Gain

3.87

A/V

VC Clamp Voltage

Switching Frequency

RT = 8.66k

RT = 29.4k

RT = 187k

1.95

0.86

195

2.25

1.07

225

2.55

1.27

255

MHz

kHz

Minimum Switch Off-Time

●

140

230

Switch Current Limit

Duty Cycle = 5%

3.3

4.9

Switch VCESAT

ISW = 2A

540

DA Pin Current to Pause OSC

1.9

2.4

Boost Schottky Reverse Leakage

VBD = 0V

0.02

µA

Minimum Boost Voltage (Note 4)

●

1.7

2.2

BOOST Pin Current

ISW = 2A

RUN/SS Pin Current

VRUN/SS = 2.5V

µA

RUN/SS Input Voltage High

2.5

RUN/SS Input Voltage Low

●

0.4

PG Threshold Offset from Feedback Voltage

VFB Rising

●

PG Hysteresis

PG Leakage

VPG = 5V

0.1

µA

PG Sink Current

VPG = 0.4V

●

200

700

µA

SYNC Threshold

0.575

0.675

0.775

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.

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)

elecTrical characTerisTics

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