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LT1977 Datasheet(PDF) 2 Page - Linear Technology |
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LT1977 Datasheet(HTML) 2 Page - Linear Technology |
2 / 24 page LT1977 2 1977fa (Note 1) VIN, SHDN, BIAS, SW, PG....................................... 60V BOOST Pin Above SW ............................................ 35V BOOST Pin Voltage ................................................. 68V SYNC, CSS, PGFB, FB ................................................ 6V Operating JunctionTemperature Range LT1977EFE (Note 2) ........................ – 40 °C to 125°C LT1977IFE (Note 2) ......................... – 40 °C to 125°C Storage Temperature Range ................. – 65 °C to 150°C Lead Temperature (Soldering, 10 sec).................. 300 °C ORDER PART NUMBER Consult LTC Marketing for parts specified with wider operating temperature ranges. LT1977EFE LT1977IFE ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VIN = 12V, SHDN = 12V, BIAS = 5V, FB/PGFB = 1.25V, CSS/SYNC = 0V unless otherwise noted. TJMAX = 125°C, θJA = 45°C/W, θJC(PAD) = 10°C/W EXPOSED PAD IS GND (PIN 17) MUST BE SOLDERED TO GND (PIN 8) FE PACKAGE 16-LEAD PLASTIC TSSOP 1 2 3 4 5 6 7 8 TOP VIEW 16 15 14 13 12 11 10 9 NC SW NC VIN NC BOOST CT GND PG SHDN SYNC PGFB FB VC BIAS CSS 17 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VSHDN SHDN Threshold 1.15 1.3 1.45 V ISHDN SHDN Input Current SHDN = 12V ● 520 µA Minimum Input Voltage (Note 3) ● 2.4 3 V IVINS Supply Shutdown Current SHDN = 0V, BOOST = 0V, FB/PGFB = 0V 0.1 2 µA Supply Sleep Current (Note 4) BIAS = 0V, FB = 1.35V ● 170 250 µA FB = 1.35V ● 45 75 µA IVIN Supply Quiescent Current BIAS = 0V, FB = 1.15V 4.10 mA BIAS = 5V, FB = 1.15V 3.25 mA Minimum BIAS Voltage (Note 5) FB = 1.15V ● 2.7 3 V IBIASS BIAS Sleep Current (Note 4) ● 110 180 µA IBIAS BIAS Quiescent Current SYNC = 3.3V 700 900 µA Minimum Boost Voltage (Note 6) ISW = 1.5A 1.8 V Input Boost Current (Note 7) ISW = 1.5A 40 mA VREF Reference Voltage (VREF) 3.3V < VVIN < 60V ● 1.225 1.25 1.275 V IFB FB Input Bias Current 75 200 nA EA Voltage Gain (Note 8) 900 V/V EA Voltage gm dI(VC)= ±10µA 450 650 900 µMho EA Source Current FB = 1.15V 20 40 55 µA EA Sink Current FB = 1.35V 15 30 40 µA VC to SW gm 3A/V VC High Clamp 2.1 2.2 2.4 V IPK SW Current Limit ● 1.5 2.4 3.5 A FE PART MARKING 1977EFE 1977IFE Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ |
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