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LT3493 Dataheets PDF



Part Number LT3493
Manufacturers Linear Technology
Logo Linear Technology
Description 750kHz Step-Down Switching Regulator
Datasheet LT3493 DatasheetLT3493 Datasheet (PDF)

LT3493 1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN FEATURES n n n n n n n n n n n DESCRIPTION The LT®3493 is a current mode PWM step-down DC/DC converter with an internal 1.75A power switch. The wide operating input range of 3.6V to 36V (40V maximum) makes the LT3493 ideal for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost ind.

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LT3493 1.2A, 750kHz Step-Down Switching Regulator in 2mm × 3mm DFN FEATURES n n n n n n n n n n n DESCRIPTION The LT®3493 is a current mode PWM step-down DC/DC converter with an internal 1.75A power switch. The wide operating input range of 3.6V to 36V (40V maximum) makes the LT3493 ideal for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The low current (<2μA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Wide Input Range: 3.6V to 36V Operating, 40V Maximum 1.2A Output Current Fixed Frequency Operation: 750kHz Output Adjustable Down to 780mV Short-Circuit Robust Uses Tiny Capacitors and Inductors Soft-Start Internally Compensated Low Shutdown Current: <2μA Low VCESAT Switch: 330mV at 1A Thermally Enhanced, Low Profile DFN Package APPLICATIONS n n n n n Automotive Battery Regulation Industrial Control Supplies Wall Transformer Regulation Distributed Supply Regulation Battery-Powered Equipment www.DataSheet4U.com TYPICAL APPLICATION Efficiency 3.3V Step-Down Converter VIN 4.2V TO 36V ON OFF VIN SHDN BOOST LT3493 SW 32.4k GND 1μF FB 10k 22pF 10μF 0.1μF 10μH VOUT 3.3V 1.2A, VIN > 12V 0.95A, VIN > 5V 90 85 80 EFFICIENCY (%) 75 70 65 60 55 3493 TA01a VIN = 12V VOUT = 3.3V L = 10μH 0 0.2 0.8 0.4 0.6 LOAD CURRENT (A) 1.0 1.2 50 3493 TA01b 3493fb 1 LT3493 ABSOLUTE MAXIMUM RATINGS (Note 1) PIN CONFIGURATION TOP VIEW FB 1 GND 2 BOOST 3 7 6 SHDN 5 VIN 4 SW Input Voltage (VIN) ....................................................40V BOOST Pin Voltage ..................................................50V BOOST Pin Above SW Pin.........................................25V SHDN Pin ..................................................................40V FB Voltage ...................................................................6V Operating Temperature Range (Note 2) LT3493E .............................................. –40°C to 85°C LT3493I ............................................. –40°C to 125°C Maximum Junction Temperature .......................... 125°C Storage Temperature Range................... –65°C to 150°C DCB PACKAGE 6-LEAD (2mm s 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 64°C/W EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH LT3493EDCB#PBF LT3493IDCB#PBF LEAD BASED FINISH LT3493EDCB LT3493IDCB TAPE AND REEL LT3493EDCB#TRPBF LT3493IDCB#TRPBF TAPE AND REEL LT3493EDCB#TR LT3493IDCB#TR PART MARKING LCGG LCGH PART MARKING LCGG LCGH PACKAGE DESCRIPTION 6-Lead (2mm × 3mm) Plastic DFN 6-Lead (2mm × 3mm) Plastic DFN PACKAGE DESCRIPTION 6-Lead (2mm × 3mm) Plastic DFN 6-Lead (2mm × 3mm) Plastic DFN TEMPERATURE RANGE –40°C to 85°C –40°C to 125°C TEMPERATURE RANGE –40°C to 85°C –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. 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/ www.DataSheet4U.com The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBOOST = 17V, unless otherwise noted. (Note 2) PARAMETER VIN Operating Range Undervoltage Lockout Feedback Voltage FB Pin Bias Current Quiescent Current Quiescent Current in Shutdown Reference Line Regulation Switching Frequency Maximum Duty Cycle TA = 25°C VFB = Measured VREF + 10mV (Note 4) Not Switching VSHDN = 0V VIN = 5V to 36V VFB = 0.7V VFB = 0V l l l ELECTRICAL CHARACTERISTICS CONDITIONS MIN 3.6 3.1 765 TYP 3.4 780 50 1.9 0.01 0.007 MAX 36 3.6 795 150 2.5 2 815 UNITS V V mV nA mA μA %/V kHz kHz % % 685 88 91 750 36 95 95 3493fb 2 LT3493 The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBOOST = 17V, unless otherwise noted. (Note 2) PARAMETER Switch Current Limit Switch VCESAT Switch Leakage Current Minimum Boost Voltage Above Switch BOOST Pin Current SHDN Input Voltage High SHDN Input Voltage Low SHDN Bias Current VSHDN = 2.3V (Note 5) VSHDN = 0V 6 0.01 ISW = 1A ISW = 1A 2.3 0.3 15 0.1 1.85 30 CONDITIONS (Note 3) ISW = 1A MIN 1.4 TYP 1.75 330 2 2.2 50 MAX 2.2 UNITS A mV μA V mA V V μA μA 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 a.


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