Datasheet LT3844 (Analog Devices) - 2

LT3844
absoluTe MaxiMuM raTings pin conFiguraTion (Note 1)
TOP VIEW Input Supply Voltage (VIN) ... 65V to –0.3V Boosted Supply Voltage (BOOST) .. 80V to –0.3V VIN 1 16 BOOST Switch Voltage (SW) (Note 8) ..65V to –1V SHDN 2 15 TG C Differential Boost Voltage SS 3 14 SW BURST_EN 4 13 VCC BOOST to SW .. 24V to –0.3V 17 VFB 5 12 PGND Bias Supply Voltage (VCC) .. 24V to –0.3V VC 6 11 SENSE+ SENSE+ and SENSE– Voltages ... 40V to –0.3V SYNC 7 10 SENSE– Differential Sense Voltage fSET 8 9 SGND SENSE+ to SENSE– ..1V to –1V FE PACKAGE BURST_EN Voltage .. 24V to –0.3V 16-LEAD PLASTIC TSSOP SYNC, VC, VFB, CSS and SHDN Voltages .. 5V to –0.3V TJMAX = 125°C, θJA = 40°C/W, θJC = 10°C/W EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB 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
orDer inForMaTion http://www.linear.com/product/LT3844#orderinfo 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/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
elecTrical characTerisTics The
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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) l 4 60 V VIN Minimum Start Voltage l 7.5 V VIN UVLO Threshold (Falling) l 3.6 3.8 4 V VIN UVLO Threshold Hysteresis 670 mV VIN Supply Current VCC > 9V 20 µA VIN Burst Mode Current VBURST_EN = 0V, VFB = 1.35V 20 µA VIN Shutdown Current VSHDN = 0V 10 15 µA BOOST Operating Voltage Range l 75 V BOOST Operating Voltage Range (Note 5) VBOOST – VSW l 20 V BOOST UVLO Threshold (Rising) VBOOST – VSW 5 V BOOST UVLO Threshold Hysteresis VBOOST – VSW 400 mV BOOST Supply Current (Note 6) 1.4 mA BOOST Burst Mode Current VBURST_EN = 0V 0.1 µA BOOST Shutdown Current VSHDN = 0V 0.1 µA 3844fc 2 For more information www.linear.com/LT3844 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts