LTC3773 Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking FEATURES DESCRIPTION Current Mode Controller with Onboard The LTC 3773 is a high performance, 3-phase, triple output MOSFET Drivers synchronous step-down switching regulator controller Programmable Power Up/Down Tracking with output voltage power up/down tracking capability. Wide V Range: 3.3V to 36V (V = 5V) The controller allows for sequential, coincident or ratio- IN CC 1% 0.6V V Accuracy Over Temperature metric tracking. FB Power Good Output Voltage Monitor This 3-phase controller drives its output stages with 120 Phase-Lockable or Adjustable Frequency: phase separation at frequencies of up to 700kHz per phase 160kHz to 700kHz minimizing the RMS input current. Light load ef ciency can OPTI-LOOP Compensation Minimizes C OUT be maximized by using selectable Burst Mode operation. Current Foldback and Overvoltage Protection The 0.6V precision reference supports output voltages Selectable Continuous, Discontinuous or from 0.6V to 5V. Burst Mode Operation at Light Load Fault protection features include output overvoltage, input Programmable Phase Operation undervoltage lockout plus current foldback under short- Available in 5mm x 7mm QFN and 36-Lead circuit or overload conditions. SSOP Packages , LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective APPLICATIONS owners. Protected by U.S. Patents including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6304066, 6498466, 6580258, 6611131. Servers, Telecom, Industrial Power Supplies General Purpose Multiple Rail DC/DC FPGA and DSP Requirements TYPICAL APPLICATION High Ef ciency, 3-Phase, Triple Synchronous DC/DC Step-Down Controller V CC 4.5V TO 6V 10k 0.1F 10F SW1, 2, 3 PGOOD V IN 4.5V TO 22V PGOOD V BOOST1, 2, 3 V CC DR V TG2 OUT2 C IN 1.5H 0.003 1.8V/15A SDB1, 2, 3 SW2 POWER UP/SHUTDOWN + TRACK1, 2, 3 BG2 C OUT2 0.01F LTC3773 + SENSE2 20k SENSE2 V FB2 V IN V TG1 OUT1 V 2.2H IN 10k 2.5V/15A 0.003 V TG3 OUT3 SW1 1.2H 0.003 1.2V/15A SW3 BG1 C OUT1 BG3 C OUT3 + PGND SENSE1 SENSE1 + SENSE3 V FB1 SENSE3 31.6k I TH1, 2, 3 10k V FB3 PLLFLTR SGND 20k 20k 3773 F01 3773fb 1LTC3773 ABSOLUTE MAXIMUM RATINGS (Note 1) Extended Commercial Operating Topside Driver Voltage (BOOSTn) ..............42V to 0.3V Temperature Range (Note 2) ................40C to 85C Switch Voltage (SWn) ...................................36V to 1V Junction Temperature (Note 2) ............................. 125C Boosted Driver Voltage (BOOSTn SWn) ....7V to 0.3V Storage Temperature Range ...................65C to 125C Supply Voltages (V , V ) ..........................7V to 0.3V CC DR Lead Temperature (Soldering, 10 sec) PGOOD, PHASEMD, PLLFLTR, PLLIN/FC, SDBn, G Package ......................................................... 300C TRACKn, V n ...............................(V + 0.3V) to 0.3V FB CC + Peak Body Temperature UHF Package................... 240C SENSE n, SENSE n ........................ (1.1 V ) to 0.3V CC I Voltage ...............................................2.7V to 0.3V THn PIN CONFIGURATIONS TOP VIEW TOP VIEW + SENSE1 1 36 PHASEMD SENSE1 2 35 PGOOD SDB 3 34 BOOST1 38 37 36 35 34 33 32 TRACK1 4 33 TG1 TRACK1 1 31 BOOST1 V 5 32 SW1 FB1 V 2 30 TG1 FB1 I 6 31 SW2 TH1 I SW1 3 29 TH1 7 30 TG2 SGND SGND 4 28 SW2 I 8 29 BOOST2 TH2 I 5 27 TG2 TH2 I 9 28 BOOST3 TH3 I 6 26 BOOST2 10 27 TG3 TH3 V FB2 39 V 7 25 BOOST3 V 11 26 SW3 FB2 FB3 TRACK2 12 25 BG1 V 8 24 TG3 FB3 13 24 TRACK3 BG2 TRACK2 9 23 SW3 SENSE2 14 23 V DR TRACK3 10 22 BG1 + SENSE2 15 22 PGND SENSE2 11 21 BG2 SENSE3 16 21 BG3 + SENSE2 12 20 V DR SENSE3+ 17 20 PLLIN/FC 13 14 15 16 17 18 19 V 18 19 PLLFLTR CC G PACKAGE 36-LEAD PLASTIC SSOP UHF PACKAGE T = 125C, = 95C/W JMAX JA 38-LEAD (5mm 7mm) PLASTIC QFN EXPOSED PAD IS PGND (PIN 39), MUST BE SOLDERED TO PCB T = 125C, = 34C/W JMAX JA ORDERING INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3773EG PBF LTC3773EG TRPBF 36-Lead Plastic SSOP 40C to 85C LTC3773EUHF PBF LTC3773EUHF TRPBF 3773E 38-Lead (5mm x 7mm) Plastic QFN 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: