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LT3682

3682f

ELECTRICAL CHARACTERISTICS

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 the device

reliability and lifetime.

Note 2: Absolute Maximum Voltage at VIN and RUN/SS pins is 60V for

nonrepetitive 1 second transients, and 36V for continuous operation.

Note 3: The LT3682E is guaranteed to meet performance speciﬁcations from

0°C to 125°C junction temperature. Speciﬁcations over the

−40°C to 125°C

operating junction temperature range are assured by design, characterization

and correlation with statistical process controls. The LT3682I is guaranteed

over the full

−40°C to 125°C operating junction temperature range.

The

l denotes speciﬁcations which apply over the full operating temperature

range, otherwise speciﬁcations are at TA = 25°C, VIN = 10V, VRUN/SS = 10V, VBD = 3.3V unless otherwise noted. (Note 3)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VC Source Current

μA

VC Sink Current

μA

VC Pin to Switch Current Gain

1.25

A/V

VC Switching Threshold

0.5

0.6

0.7

VC Clamp Voltage

Switching Frequency

RRT = 8.06kΩ

RRT = 29.4kΩ

RRT = 158kΩ

1.98

0.9

225

2.2

250

2.42

1.1

275

MHz

kHz

Minimum Switch Off-Time

130

210

Switch Current Limit (Note 7)

SYNC = 0V

SYNC = 3.3V or Clocked

1.45

1.18

1.7

1.4

1.66

Switch VCESAT

ISW = 1A

460

DA Pin Current to Stop OSC

1.25

1.6

1.95

Switch Leakage Current

VSW = 0V, VIN = 60V

0.01

μA

Boost Schottky Diode Voltage Drop

IBSD = 50mA

720

850

Boost Schottky Diode Reverse Leakage

VSW = 10V, VBD = 0

0.1

μA

Minimum Boost Voltage (Note 5)

1.7

2.5

BOOST Pin Current

ISW = 0.5A

10.5

17.5

RUN/SS Pin Current

VRUN/SS = 10V

μA

RUN/SS Input Voltage High

2.5

RUN/SS Input Voltage Low

0.2

PG Leakage Current

VPG = 5V

0.1

μA

PG Sink Current

VPG = 0.4V

100

1000

μA

PG Threshold as % of VFB

Measured at FB pin. FB Pin Voltage Rising

88%

90%

92%

PG Threshold Hysteresis

Measured at FB Pin

SYNC Threshold Voltage

300

550

800

SYNC Input Frequency

0.3

2.2

MHz

Note 4: Bias current ﬂows out of the FB pin.

Note 5: This is the minimum voltage across the boost capacitor needed to

guarantee full saturation of the switch.

Note 6: This IC includes over-temperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed the maximum operating junction temperature

when over-temperature protection is active. Continuous operation above

the speciﬁed maximum operating junction temperature may impair device

reliability.

Note 7: Current limit guaranteed by design and/or correlation to static test.

Slope compensation reduces current limit at higher duty cycles.

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