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LT3460 Dataheets PDF



Part Number LT3460
Manufacturers Linear Technology
Logo Linear Technology
Description 1.3 MHz/650kHz Step-Up DC/DC Converter
Datasheet LT3460 DatasheetLT3460 Datasheet (PDF)

FEATURES n 1.3MHz (LT3460) Switching Frequency n 650kHz (LT3460-1) Switching Frequency n High Output Voltage: Up to 36V n 300mA Integrated Switch (LT3460) n 180mA Integrated Switch (LT3460-1) n Wide Input Range: 2.5V to 16V n Uses Small Surface Mount Components n Low Shutdown Current: <1μA n Low Profile (1mm) SC70 (LT3460 and LT3460-1), SOT-23 (ThinSOT™) (LT3460) and 2mm × 2mm DFN (LT3460-1) Packages APPLICATIONS n Digital Cameras n CCD Bias Supply n XDSL Power Supply n TFT-LCD Bias Supply n Loca.

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FEATURES n 1.3MHz (LT3460) Switching Frequency n 650kHz (LT3460-1) Switching Frequency n High Output Voltage: Up to 36V n 300mA Integrated Switch (LT3460) n 180mA Integrated Switch (LT3460-1) n Wide Input Range: 2.5V to 16V n Uses Small Surface Mount Components n Low Shutdown Current: <1μA n Low Profile (1mm) SC70 (LT3460 and LT3460-1), SOT-23 (ThinSOT™) (LT3460) and 2mm × 2mm DFN (LT3460-1) Packages APPLICATIONS n Digital Cameras n CCD Bias Supply n XDSL Power Supply n TFT-LCD Bias Supply n Local 5V or 12V Supply n Medical Diagnostic Equipment n Battery Backup LT3460/LT3460-1 1.3 MHz/650kHz Step-Up DC/DC Converter in SC70, ThinSOT and DFN DESCRIPTION The LT®3460/LT3460-1 are general purpose step-up DC/ DC converters. The LT3460/LT3460-1 switch at 1.3MHz/ 650kHz, allowing the use of tiny, low cost and low height capacitors and inductors. The constant frequency results in low, predictable output noise that is easy to filter. The high voltage switches in the LT3460/LT3460-1 are rated at 38V, making the device ideal for boost converters up to 36V. The LT3460 can generate 12V at up to 70mA from a 5V supply. The low 1mA quiescent current and 650kHz switching frequency of LT3460-1 make it ideal for lower current applications. The LT3460 is available in SC70 and SOT-23 packages. The LT3460-1 is available in SC70 and 2mm × 2mm DFN packages. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 5V to 12V, 70mA Step-Up DC/DC Converter 22μH VIN 5V 4.7μF OFF ON VIN SW LT3460 SHDN FB GND 130k 22pF VOUT 12V 70mA 1μF 15k 3460 F01 EFFICIENCY (%) Efficiency 90 85 80 75 70 65 60 0 20 40 60 LOAD CURRENT (mA) 80 3460 F01a Switching Waveforms VSW 5V/DIV IL 100mA/DIV 0.2μs/DIV 3460 F01b 3460fb 1 LT3460/LT3460-1 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Voltage (VIN)....................................................16V SW Voltage ...............................................................38V FB Voltage...................................................................5V SHDN Voltage ...........................................................16V Operating Ambient Temperature Range (Note 2)....................– 40°C to 85°C Maximum Junction Temperature........................... 125°C Storage Temperature Range................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300°C PIN CONFIGURATION TOP VIEW SW 1 GND 2 FB 3 5 VIN 4 SHDN S5 PACKAGE 5-LEAD PLASTIC TSOT-23 TJMAX = 125°C, θJA = 256°C/W IN FREE AIR θJA = 120°C ON BOARD OVER GROUND PLANE TOP VIEW FB 1 6 SHDN NC 2 7 5 NC SW 3 4 VIN TOP VIEW SW 1 GND 2 FB 3 6 VIN 5 GND 4 SHDN SC6 PACKAGE 6-LEAD PLASTIC SC70 TJMAX = 125°C, θJA = 400°C/W IN FREE AIR θJA = 270°C/W ON BOARD OVER GROUND PLANE DC PACKAGE 6-LEAD (2mm × 2mm) PLASTIC DFN TJMAX = 125°C, θJA = 102°C/W EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION LT3460ES5#PBF LT3460ES5#TRPBF LTB1 5-Lead Plastic TSOT-23 LT3460ESC6#PBF LT3460ESC6#TRPBF LAAF 6-Lead Plastic SC70 LT3460ESC6-1#PBF LT3460ESC6-1#TRPBF LDJV 6-Lead Plastic SC70 LT3460EDC-1#PBF LT3460EDC-1#TRPBF LDNB 6-Lead (2mm × 2mm) Plastic DFN 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/ TEMPERATURE RANGE –40°C to 85°C –40°C to 85°C –40°C to 85°C –40°C to 85°C 3460fb 2 LT3460/LT3460-1 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 3V, VSHDN = 3V, unless otherwise noted. LT3460 LT3460-1 PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS Minimum Operating Voltage 2.5 2.5 V Maximum Operating Voltage 16 16 V Feedback Voltage 1.235 1.255 1.275 1.235 1.255 1.275 l 1.225 1.280 1.225 1.280 V V Feedback Line Regulation 2.5V < VIN < 16V FB Pin Bias Current 0.015 l5 25 80 0.015 %/V 0 25 80 nA Supply Current SHDN = 0V 2.0 3.0 0.1 0.5 1.0 1.5 mA 0.1 0.5 μA Switching Frequency 1.0 1.3 1.7 0.35 0.65 1.0 MHz Maximum Duty Cycle 85 90 80 90 % Switch Current Limit 300 420 600 180 260 380 mA Switch VCESAT Switch Leakage Current SHDN Voltage High SHDN Voltage Low SHDN Pin Bias Current ISW = 250mA (LT3460), ISW = 100mA (LT3460-1) VSW = 5V 320 450 220 350 mV 0.01 1 0.01 1 μA 1.5 1.5 V 0.4 0.4 V 40 15 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 .


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