POWER LOSS (W) LTC3829 3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp FEATURES DESCRIPTION n Optional Nonlinear Control for Fast Response The LTC 3829 is a high performance 3-phase single output n 0.75%, 0.6V Reference Accuracy synchronous step-down DC/DC switching controller that n PWM, Stage Shedding or Burst Mode Operation drives all N-channel synchronous power MOSFET stages. n High Efficiency: Up to 95% A constant frequency current mode architecture allows a n R or DCR Current Sensing phase-lockable frequency of up to 770kHz. Power loss and SENSE n Programmable DCR Temperature Compensation noise due to ESR of the input capacitors are minimized by n Phase-Lockable Fixed Frequency: 250kHz to 770kHz operating the three controller output stages out of phase. n True Remote Sense Differential Amplifier The LTC3829 can be configured for 6-phase operation, n Programmable Active Voltage Positioning (AVP) has DCR temperature compensation, and output foldback n Triple N-Channel MOSFET Synchronous Drive current limiting. This device features a precision 0.6V ref- n Wide V Range: 4.5V to 38V Operation IN erence and a power good indicator. n V Range: 0.6V to 5V without Diffamp OUT n Light load efficiency is optimized by using a choice of V Range: 0.6V to 3.3V with Diffamp OUT n output Stage Shedding or Burst Mode operation. A dif- Clock Input and Output for 6-Phase Operation n ferential amplifier provides true remote sensing of the Adjustable Soft-Start or V Tracking OUT n output voltage at the point of load. 38-Pin (5mm 7mm) QFN and FE Packages n AEC-Q100 Qualified for Automotive Applications The LTC3829 is available in both low profile 38-pin 5mm 7mm QFN and Exposed Pad FE packages. APPLICATIONS All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, n Notebook and Palmtop Computers 6498466, 6674274, 6611136. n Telecom Systems n DC Power Distribution Systems TYPICAL APPLICATION V IN 6V TO 28V + 22F V IN 35V INTV TG1 CC 0.6H 0.002 3 4.7F SW1 Efficiency BG1 BOOST1 PGND 100 16 BOOST2 V = 12V IN + BOOST3 SENSE1 95 V = 1.5V OUT 14 SENSE1 V IN 90 12 SW3 SW2 SW1 TG2 85 0.6H 0.002 V OUT 100k EFFICIENCY SW2 1.2V 10 FREQ 80 680pF 50A BG2 75 LTC3829 8 I TH 70 TK/SS 6 + SENSE2 5k 0.1F 65 SENSE2 POWER LOSS 4 SGND V IN 60 DIFFOUT TG3 2 0.6H 0.002 55 SW3 20k 50 0 BG3 0.1 1 10 100 V FB LOAD CURRENT (A) DIFFN 20k + 3829 TA01b SENSE3 DIFFP C SENSE3 OUT + 470F 4V 4 3829 TA01 Rev. E 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3829 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Supply Voltage (V ) ......................... 40V to 0.3V I Voltage ............................................INTV to 0.3V IN TH CC + Topside Driver Voltages (BOOSTn) ............. 46V to 0.3V SENSE n, SENSE n................................... 5.7V to 0.3V Switch Voltage (SWn) ................................... 40V to 5V Operating Junction Temperature Range Boosted Driver Voltage (BOOSTn SWn) .... 6V to 0.3V (Notes 2, 3) ............................................ 45C to 125C INTV , PGOOD, RUN, EXTV ................... 6V to 0.3V Storage Temperature Range .................. 65C to 125C CC CC ITEMP, IFAST, V Pin Voltages ............INTV to 0.3V Lead Temperature (Soldering, 10 sec) (FE) ...........300C FB CC TK/SS, FREQ, DIFFP, DIFFN, DIFFOUT, ISET AVP, I , MODE, PLLIN Voltages .........INTV to 0.3V LIM CC PIN CONFIGURATION TOP VIEW TOP VIEW 1 38 IFAST ITEMP DIFFOUT 2 37 MODE DIFFN 3 36 CLKOUT 38 37 36 35 34 33 32 4 35 BOOST1 DIFFP DIFFN 1 31 SW1 RUN 5 34 TG1 DIFFP BG1 2 30 AVP 6 33 SW1 RUN 3 29 BG2 + 7 32 BG1 SENSE1 AVP 4 28 SW2 SENSE1 8 31 BG2 + SENSE1 5 27 TG2 + SENSE2 9 30 SW2 SENSE1 6 26 BOOST2 10 39 29 TG2 SENSE2 39 + SENSE2 V 7 25 IN TK/SS 11 28 BOOST2 SENSE2 8 24 INTV CC 12 27 V FREQ IN TK/SS 9 23 EXTV CC + 13 INTV SENSE3 26 CC FREQ 10 22 BG3 SENSE3 14 25 EXTV CC + SENSE3 11 21 SW3 15 24 BG3 V FB SENSE3 20 TG3 12 16 SW3 I 23 TH 13 14 15 16 17 18 19 ISET 17 22 TG3 18 21 BOOST3 I LIM 19 PLLIN PGOOD 20 UHF PACKAGE 38-LEAD (5mm 7mm) PLASTIC QFN FE PACKAGE T = 125C, = 34C/W JMAX JA 38-LEAD PLASTIC TSSOP EXPOSED PAD (PIN 39) IS SGND/PGND, MUST BE SOLDERED TO PCB T = 125C, = 25C/W JMAX JA EXPOSED PAD (PIN 39) IS SGND/PGND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3829EUHF PBF LTC3829EUHF TRPBF 3829 38-Lead (5mm 7mm) Plastic QFN 40C to 125C LTC3829IUHF PBF LTC3829IUHF TRPBF 3829 38-Lead (5mm 7mm) Plastic QFN 40C to 125C LTC3829EFE PBF LTC3829EFE TRPBF LTC3829 38-Lead Plastic TSSOP 40C to 125C LTC3829IFE PBF LTC3829IFE TRPBF LTC3829 38-Lead Plastic TSSOP 40C to 125C Rev. E 2 For more information www.analog.com V DIFFOUT FB I ITEMP TH ISET IFAST I MODE LIM PGOOD CLKOUT PLLIN BOOST1 BOOST3 TG1