LT3681 Ver la hoja de datos (PDF) - Linear Technology

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LT3681

36V, 2A, 2.8MHz Step-Down Switching Regulator with Integrated Power Schottky Diode

Linear Technology 

LT3681

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUNS/SS = 10V VBOOST = 15V, VBIAS = 3.3V unless otherwise

noted. (Note 2)

PARAMETER

Power Schottky Diode Forward Voltage

Power Schottky Diode Leakage Current

Switching Frequency

Minimum Switch Off-Time

Switch Current Limit

Switch VCESAT

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

CONDITIONS

IDA = 1A

IDA = 2A

VDC-DA = 40V

RT = 8.66k

RT = 29.4k

RT = 187k

Duty Cycle = 5%

ISW = 2A

VSW = 10V, VBIAS = 0V

ISW = 1A

VRUN/SS = 2.5V

VFB Rising

VPG = 5V

VPG = 3V

MIN

2.5

1.25

250

●

3.2

●

2.5

● 100

TYP MAX UNITS

0.50

V

0.56

V

100

μA

2.8

3.1

MHz

1.4 1.55

MHz

300 350

kHz

130 200

nS

3.8

4.4

A

360

mV

0.02

2

µA

1.5

2.1

V

18

35

mA

5

10

μA

V

0.2

V

122

mV

5

mV

0.1

1

μA

600

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 LT3681E is guaranteed to meet performance specifications

from 0°C to 85°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: Bias current flows into the FB pin.

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

guarantee full saturation of the switch.

3681f

3

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