LT3995HMSE#PBF Analog Devices

LT3995 60V, 3A, 2MHz Step-Down Switching Regulator with 2.7A Quiescent Current FEATURES DESCRIPTION n Ultralow Quiescent Current: The LT 3995 is an adjustable frequency monolithic buck 2.7A I at 12V to 3.3V switching regulator that accepts a wide input voltage range Q IN OUT n Low Ripple Burst Mode Operation up to 60V. Low quiescent current design consumes only Output Ripple < 15mV 2.7A of supply current while regulating with no load. Low P-P n Wide Input Range: Operation from 4.3V to 60V ripple Burst Mode operation maintains high efficiency at n 3A Maximum Output Current low output currents while keeping the output ripple below n Excellent Start-Up and Dropout Performance 15mV in a typical application. The LT3995 can supply up n Adjustable Switching Frequency: 200kHz to 2MHz to 3A of load current and has current limit foldback to n Synchronizable Between 250kHz to 2MHz limit power dissipation during short circuit. A low dropout n Accurate Programmable Undervoltage Lockout voltage of 500mV is maintained when the input voltage n Low Shutdown Current: I = 700nA drops below the programmed output voltage, such as Q n Power Good Flag during automotive cold crank. n Soft-Start Capability An internally compensated current mode topology is used n Thermal Shutdown Protection for fast transient response and good loop stability. A high n Current Limit Foldback with SS Override efficiency 85m switch is included on the die along with a n Saturating Switch Design: 85m On Resistance boost Schottky diode and the necessary oscillator, control, n Small, Thermally Enhanced 16-Lead MSOP Package and logic circuitry. An accurate 1.02V threshold enable pin can be driven directly from a microcontroller or used as a APPLICATIONS programmable undervoltage lockout. A capacitor on the n Automotive Battery Regulation SS pin provides a controlled inrush current (soft-start). n Portable Products A power good flag signals when V reaches 91.6% of OUT n Industrial Supplies the programmed output voltage. The LT3995 is available L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks in a small 16-lead MSOP package with exposed pad for of Linear Technology Corporation. All other trademarks are the property of their respective owners. low thermal resistance. TYPICAL APPLICATION No-Load Supply Current 4.5 3.3V Step-Down Converter IN REGULATION 4.0 V IN 4.3V TO 60V 3.5 V IN OFF ON EN BOOST 3.0 8.2H 0.47F PG SW 2.5 10F PDS560 LT3995 2.0 SS OUT V 1M OUT 1.5 RT FB 3.3V 10pF 3A SYNC GND 10nF 47F 1.0 182k 576k 1210 0 5 10 15 20 25 30 35 40 45 50 55 60 2 INPUT VOLTAGE (V) 3995 TA01a f = 300kHz 3995 TA01b 3995f 1 For more information www.linear.com/LT3995 INPUT CURRENT (A)LT3995 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V , EN Voltage (Note 3) ...........................................60V IN FB 1 16 SYNC BOOST Pin Voltage ...................................................75V 2 SS 15 PG OUT 3 14 RT BOOST Pin Above SW Pin .........................................30V 4 17 BOOST 13 EN SW 5 GND 12 V IN FB, RT, SYNC, SS Voltage ...........................................6V 6 SW 11 V IN SW 7 10 V IN PG Voltage ................................................................30V 8 NC 9 NC OUT Voltage ..............................................................16V MSE PACKAGE 16-LEAD PLASTIC MSOP Operating Junction Temperature Range (Note 2) = 40C/W JA LT3995E ............................................ 40C to 125C EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB LT3995I ............................................. 40C to 125C LT3995H ............................................ 40C to 150C Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) ...................300C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3995EMSE PBF LT3995EMSE TRPBF 3995 16-Lead Plastic MSOP 40C to 125C LT3995IMSE PBF LT3995IMSE TRPBF 3995 16-Lead Plastic MSOP 40C to 125C LT3995HMSE PBF LT3995HMSE TRPBF 3995 16-Lead Plastic MSOP 40C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: