POWER LOSS (mW) LTC3603 2.5A, 15V Monolithic Synchronous Step-Down Regulator Features Description n Wide Input Voltage Range: 4.5V to 15V The LTC 3603 is a high efficiency, monolithic synchronous n 2.5A Output Current step-down DC/DC converter utilizing a constant-frequency, n Low R Internal Switches: 45m and 85m current mode architecture. It operates from an input voltage DS(ON) n Programmable Frequency: 300kHz to 3MHz range of 4.5V to 15V and provides an adjustable regulated n Low Quiescent Current: 75A output voltage from 0.6V to 14.5V while delivering up to n 0.6V 1% Reference Allows Precise, 2.5A of output current. The internal synchronous power Low Output Voltage switch with 45m on-resistance increases efficiency n 99% Maximum Duty Cycle and eliminates the need for an external Schottky diode. n Adjustable Burst Mode Clamp The switching frequency can either be set by an external n Synchronizable to External Clock resistor or synchronized to an external clock. OPTI-LOOP n Power Good Output Voltage Monitor compensation allows the transient response to be optimized n Overtemperature Protection over a wide range of loads and output capacitors. n Overvoltage Protection The LTC3603 can be configured for either Burst Mode op - n Available in 16-Lead Thermally Enhanced eMSOP eration or forced continuous operation. Forced continuous and 4mm 4mm QFN Packages operation reduces noise and RF interference, while Burst Mode operation provides the highest efficiency at light a loads. In Burst Mode operation, external control of the burst n Point-of-Load Supplies clamp level allows the output voltage ripple to be adjusted n Portable Instruments according to the requirements of the application. n Communications Infrastructure L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6580258, 6498466, 6611131, 6177787, 5705919, 5847554. t ypical a 3.3V, 2.5A, 1MHz Step-Down Regulator Efficiency and Power Loss vs Load Current V IN 100 10000 4.5V TO 15V V = 12V IN V = 3.3V OUT 95 EFFICIENCY 22F 1F 90 1000 PV INTV IN CC RUN BOOST 85 0.22F RT LTC3603 2.2H V 80 100 OUT 105k PGOOD 3.3V SW 2.5A 75 100F TRACK/SS POWER LOSS 4.32k 70 10 PGND ITH 1nF SYNC/MODE V 65 FB 475k 60 1 10pF 0.001 0.01 0.1 1 10 105k 3603 TA01 LOAD CURRENT (A) 3603 TA01b 3603fc 1 For more information www.linear.com/LTC3603 EFFICIENCY (%) pplication pplicationsLTC3603 a bsolute Maxi Mu M r (Note 1) PV Supply Voltage (DC) .......................... 0.3V to 16V Peak SW Sink and Source Current (Note 7) .............6.5A IN PV Supply Transient Voltage (<1s) .......................21V Operating Junction Temperature Range IN SW .............................................. 0.3V to (PV + 0.3V) (Notes 2, 5, 6) .................................... 40C to 125C IN BOOST .................................(V 0.3V) to (V + 6V) Lead Temperature (Soldering, 10 seconds) SW SW RUN ........................................................... 0.3V to 16V MSE Package ....................................................300C All Other Pins ............................................... 0.3V to 6V p in c F TOP VIEW 20 19 18 17 16 TOP VIEW INTV 1 16 PV CC IN PV 1 15 PGND IN 2 SYNC/MODE 15 PV IN PV 2 14 PGND PGOOD 3 14 BOOST IN 4 17 21 RT 13 SW INTV 3 13 PGND CC ITH 5 SGND 12 SW SGND 6 V 11 PGND SYNC/MODE 4 PGND FB 12 SGND 7 10 PGND TRACK/SS PGOOD 5 11 8 RUN 9 TRACK/SS MSE PACKAGE 6 7 8 9 10 16-LEAD PLASTIC eMSOP T = 125C, = 45C/W, = 10C/W JMAX JA JC EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB UF PACKAGE 20-LEAD (4mm 4mm) PLASTIC QFN T = 125C, = 37C/W, = 5C/W JMAX JA JC EXPOSED PAD (PIN 21) IS SGND, MUST BE SOLDERED TO PCB Der in F M LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3603EMSE PBF LTC3603EMSE TRPBF 3603 16-Lead Plastic eMSOP 40C to 125C LTC3603IMSE PBF LTC3603IMSE TRPBF 3603 16-Lead Plastic eMSOP 40C to 125C LTC3603EUF PBF LTC3603EUF TRPBF 3603 20-Lead (4mm 4mm) Plastic QFN 40C to 125C LTC3603IUF PBF LTC3603IUF TRPBF 3603 40C to 125C 20-Lead (4mm 4mm) Plastic QFN 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: