LTC1702A datasheet(2/24 Pages) LINER

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LT3844

3844fb

PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

(Note 1)

FE PACKAGE

16-LEAD PLASTIC TSSOP

TOP VIEW

VIN

SHDN

CSS

BURST_EN

VFB

SYNC

fSET

BOOST

VCC

PGND

SENSE+

SENSE–

SGND

TJMAX = 125°C, θJA = 40°C/W, θJC = 10°C/W

EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LT3844EFE#PBF

LT3844EFE#TRPBF

3844EFE

16-Lead Plastic TSSOP

–40°C to 125°C

LT3844IFE#PBF

LT3844IFE#TRPBF

3844IFE

16-Lead Plastic TSSOP

–40°C to 125°C

Consult LTC Marketing for parts speciﬁed with wider operating temperature ranges.

Consult LTC Marketing for information on non-standard lead based ﬁnish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel speciﬁcations, go to: http://www.linear.com/tapeandreel/

Input Supply Voltage (VIN)......................... 65V to –0.3V

Boosted Supply Voltage (BOOST) .............. 80V to –0.3V

Switch Voltage (SW) (Note 8) ....................... 65V to –1V

Differential Boost Voltage

BOOST to SW ........................................ 24V to –0.3V

Bias Supply Voltage (VCC).......................... 24V to –0.3V

SENSE+ and SENSE– Voltages ................... 40V to –0.3V

Differential Sense Voltage

SENSE+ to SENSE– ..................................... 1V to –1V

BURST_EN Voltage .................................... 24V to –0.3V

SYNC, VC, VFB, CSS and SHDN Voltages ...... 5V to –0.3V

SHDN Pin Currents ..................................................1mA

Operating Junction Temperature Range (Note 2)

LT3844E (Note 3)............................... –40°C to 125°C

LT3844I.............................................. –40°C to 125°C

Storage Temperature.............................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec) .................. 300°C

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

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 20V, VCC = BOOST = BURST_EN = 10V, SHDN = 2V, RSET = 49.9k,

SENSE– = SENSE+ = 10V, SGND = PGND = SW = SYNC = 0V, unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN Operating Voltage Range (Note 4)

VIN Minimum Start Voltage

VIN UVLO Threshold (Falling)

VIN UVLO Threshold Hysteresis

3.6

3.8

670

7.5

VIN Supply Current

VIN Burst Mode Current

VIN Shutdown Current

VCC > 9V

VBURST_EN = 0V, VFB = 1.35V

VSHDN = 0V

μA

BOOST Operating Voltage Range

BOOST Operating Voltage Range (Note 5)

BOOST UVLO Threshold (Rising)

BOOST UVLO Threshold Hysteresis

VBOOST – VSW

400

BOOST Supply Current (Note 6)

BOOST Burst Mode Current

BOOST Shutdown Current

VBURST_EN = 0V

VSHDN = 0V

1.4

0.1

μA

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