LT3980 58V, 2A, 2.4MHz Step-Down Switching Regulator with 85A Quiescent Current Fea T Descrip T The LT 3980 is an adjustable frequency (100kHz to Wide Input Range: Operation from 3.6V to 58V 2.4MHz) monolithic buck switching regulator that accepts Overvoltage Lockout Protects Circuits Through 80V input voltages up to 58V (80V transient). A high efficiency Transients 200m switch is included on the die along with a boost 2A Maximum Output Current Schottky diode and the necessary oscillator, control, and Low Ripple (<15mV ) Burst Mode Operation: P-P logic circuitry. Current mode topology is used for fast I = 85A at 12V to 3.3V Q IN OUT transient response and good loop stability. Catch diode Adjustable Switching Frequency: 100kHz to 2.4MHz current sense (DA pin) protects the circuit during input Low Shutdown Current: I < 1A Q voltage transients even when a high switching frequency Catch Diode Current Sense Protects Circuit Through is used. Low ripple Burst Mode operation maintains high Short-Circuit and Input Overvoltage efficiency at low output currents while keeping output Synchronizable Between 250kHz to 2MHz ripple below 15mV in a typical application. In addition, the Power Good Flag LT3980 can further enhance low output current efficiency Saturating Switch Design: 200m On-Resistance by drawing bias current from the output when V is Thermal Protection OUT above 3V. Shutdown reduces input supply current to less Soft-Start Capability than 1A while a resistor and capacitor on the RUN/SS Small 16-Pin Thermally Enhanced MSOP and pin provide a controlled output voltage ramp (soft-start). 3mm 4mm DFN Packages A power good flag signals when V reaches 91% of OUT a T the programmed output voltage. The LT3980 is available in 16-pin MSOP and 3mm 4mm DFN packages with Automotive Battery Regulation exposed pads for low thermal resistance. Distributed Supply Regulation L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks Industrial Supplies of Linear Technology Corporation. All other trademarks are the property of their respective owners. Wall Transformer Regulation Typical a T 5V Step-Down Converter Efficiency, V = 5V OUT V OUT 95 V IN 5V V = 12V 6.5V TO 58V IN 2A 90 TRANSIENT V BD TO 80V IN 85 V = 24V IN RUN/SS BOOST OFF ON 80 V = 48V IN 0.47F 10H 75 4.75k V SW C LT3980 10F 70 22pF RT 65 1nF PG DA 60 536k 97.6k SYNC FB GND f = 400kHz 55 D = DIODES, INC. SBR3U100LP 100k 47F 50 0 0.5 1 1.5 2 I (A) LOAD 3980 TA01 3980 TA01b 3980fa For more information www.linear.com/LT3980 1 EFFICIENCY (%) ion pplica ions pplica ion uresLT3980 a Te m aximum r a T Gs (Note 1) Operating Junction Temperature Range (Note 2) V , RUN/SS Voltage (Note 5) ...................................80V IN LT3980E .............................................40C to 125C BOOST Pin Voltage ...................................................75V LT3980I ..............................................40C to 125C BOOST Pin Above SW Pin .........................................30V LT3980H ............................................40C to 150C FB, RT, V Voltage .......................................................5V C Storage Temperature Range ...................65C to 150C PG, BD, SYNC Voltage ..............................................25V Lead Temperature (Soldering, 10 sec) (MSE Only) ....................................................... 300C p Fi G T TOP VIEW TOP VIEW SYNC 1 14 DA SYNC 1 16 NC NC 2 13 NC PG 2 15 DA V PG 3 12 NC 3 14 V IN IN 15 4 17 13 NC FB FB 4 GND 11 SW NC 5 GND 12 SW V 5 10 BOOST V 6 11 BOOST C C RT 7 10 BD RT 6 9 BD 8 9 RUN/SS GND GND 7 8 RUN/SS MSE PACKAGE 16-LEAD PLASTIC MSOP DE14 PACKAGE = 45C/W, = 10C/W 14-LEAD (4mm 3mm) PLASTIC DFN JA JC EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB = 45C/W, = 10C/W JA JC EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB Der in F T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3980EDE PBF LT3980EDE TRPBF 3980 40C to 125C 14-Lead (3mm 4mm) Plastic DFN LT3980IDE PBF LT3980IDE TRPBF 3980 14-Lead (3mm 4mm) Plastic DFN 40C to 125C LT3980EMSE PBF LT3980EMSE TRPBF 3980 16-Lead Plastic MSOP 40C to 125C LT3980IMSE PBF LT3980IMSE TRPBF 3980 16-Lead Plastic MSOP 40C to 125C LT3980HMSE PBF LT3980HMSE TRPBF 3980 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: