LTC3829 3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp FEATURESDESCRIPTION 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 RSENSE or DCR Current Sensing phase-lockable frequency of up to 770kHz. Power loss and 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 VIN Range: 4.5V to 38V Operation erence and a power good indicator. n VOUT Range: 0.6V to 5V without Diffamp n V Light load efficiency is optimized by using a choice of OUT Range: 0.6V to 3.3V with Diffamp n Clock Input and Output for 6-Phase Operation output Stage Shedding or Burst Mode operation. A dif- n Adjustable Soft-Start or V ferential amplifier provides true remote sensing of the OUT Tracking n 38-Pin (5mm × 7mm) QFN and FE Packages output voltage at the point of load. 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 VIN + 22µF 6V TO 28V INTV VIN 35V CC TG1 0.6µH 4.7µF 0.002Ω ×3 SW1 BG1 Efficiency BOOST1 BOOST2 PGND 100 16 VIN = 12V BOOST3 SENSE1+ 95 V SENSE1– OUT = 1.5V 14 VIN 90 SW3 SW2 SW1 12 TG2 POWER LOSS (W) 85 100k 0.6µH 0.002Ω VOUT EFFICIENCY FREQ SW2 1.2V 80 10 680pF 50A BG2 LTC3829 75 8 ITH TK/SS 70 6 5k 0.1µF SENSE2+ EFFICIENCY (%) SENSE2– 65 SGND V POWER LOSS 4 IN 60 DIFFOUT TG3 0.6µH 0.002Ω 55 2 SW3 20k 50 0 BG3 0.1 1 10 100 VFB LOAD CURRENT (A) 20k DIFFN DIFFP SENSE3+ 3829 TA01b SENSE3– + COUT 470µF 4V ×4 3829 TA01 Rev. E Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Application Package Description Revision History Typical Application Related Parts
