LT3972 datasheet(3/24 Pages) LINER

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LT3972

3972f

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VBD = 3V, Not Switching

●

130

μA

VBD = 0, Not Switching

μA

Minimum Bias Voltage (BD Pin)

2.7

Feedback Voltage

●

780

775

790

800

805

FB Pin Bias Current (Note 3)

VFB = 0.8V, VC = 1.2V

●

FB Voltage Line Regulation

4V < VIN < 33V

0.002

0.01

%/V

Error Amp gm

500

μMho

Error Amp Gain

2000

VC Source Current

μA

VC Sink Current

μA

VC Pin to Switch Current Gain

5.3

A/V

VC Clamp Voltage

Switching Frequency

RT = 8.66k

RT = 29.4k

RT = 187k

2.2

1.0

200

2.45

1.1

230

2.7

1.25

260

MHz

kHz

Minimum Switch Off-Time

●

150

Switch Current Limit

Duty Cycle = 5%

4.6

5.4

6.2

Switch VCESAT

ISW = 3.5A

335

Boost Schottky Reverse Leakage

VBD = 0V

0.02

μA

Minimum Boost Voltage (Note 4)

●

1.5

BOOST Pin Current

ISW = 1A

RUN/SS Pin Current

VRUN/SS = 2.5V

μA

RUN/SS Input Voltage High

2.5

RUN/SS Input Voltage Low

0.2

PG Threshold Offset from Feedback Voltage

VFB Rising

PG Hysteresis

PG Leakage

VPG = 5V

0.1

μA

PG Sink Current

VPG = 0.4V

●

200

800

μA

SYNC Low Threshold

0.5

SYNC High Threshold

0.7

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 LT3972E 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 LT3972I speciﬁcations are

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

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 62V for non-

repetitive 1 minute transients, and 40V 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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