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LT1946A Datasheet(PDF) 2 Page - Linear Technology |
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LT1946A Datasheet(HTML) 2 Page - Linear Technology |
2 / 12 page LT1946A 2 sn1946a 1946afs VIN Voltage .............................................................. 16V SW Voltage ................................................– 0.4V to 36V FB Voltage .............................................................. 2.5V Current into FB Pin ............................................... ±1mA SHDN Voltage .......................................................... 16V Maximum Junction Temperature .......................... 125 °C Operating Temperature Range (Note 2) ....................................... – 40 °C to 85°C Storage Temperature Range ................. – 65 °C to 150°C Lead Temperature (Soldering, 10 sec).................. 300 °C ORDER PART NUMBER MS8E PART MARKING TJMAX = 125°C, θJA = 40°C/W, θJC = 10°C/W Consult LTC Marketing for parts specified with wider operating temperature ranges. LTYZ LT1946AEMS8E (Note 1) Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT1946AE is guaranteed to meet performance specifications from 0 °C to 70°C. Specifications over the –40°C to 85°C operating The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3V, VSHDN = VIN unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Operating Voltage 2.45 2.6 V Maximum Operating Voltage 16 V Feedback Voltage 1.23 1.25 1.27 V q 1.22 1.27 V FB Pin Bias Current VFB = 1.25V (Note 3) q 20 120 nA Error Amp Transconductance ∆I = 2µA40 µmhos Error Amp Voltage Gain 300 V/V Quiescent Current VSHDN = 2.5V, Not Switching 3.6 5 mA Quiescent Current in Shutdown VSHDN = 0V, VIN = 3V 0 1 µA Reference Line Regulation 2.6V ≤ VIN ≤ 16V 0.01 0.05 %/V Switching Frequency 2.4 2.7 3 MHz q 2.3 3.1 MHz Switching Frequency in Foldback VFB = 0V 0.85 MHz Maximum Duty Cycle q 73 80 % Switch Current Limit (Note 4) q 1.5 2.1 3.1 A Switch VCESAT ISW = 1A 240 340 mV Switch Leakage Current VSW = 5V 0.01 1 µA Soft-Start Charging Current VSS = 0.5V 2.5 4 6 µA SHDN Input Voltage High 2.4 V SHDN Input Voltage Low 0.5 V SHDN Pin Bias Current VSHDN = 3V 16 32 µA VSHDN = 0V 0 0.1 µA temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Current flows out of the FB pin. Note 4: Current limit guaranteed by design and/or correlation to static test. Current limit is independent of duty cycle and is guaranteed by design. 1 2 3 4 VC FB SHDN GND 8 7 6 5 SS COMP VIN SW TOP VIEW MS8E PACKAGE 8-LEAD PLASTIC MSOP EXPOSED PAD IS GROUND (MUST BE SOLDERED TO PCB) ELECTRICAL CHARACTERISTICS ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO |
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