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LTC3829IUHF-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3829IUHF-PBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 40 page  LTC3829 3829f 3-Phase, Single Output Synchronous Step-Down DC/DC Controller with Diffamp Typical applicaTion DescripTion TheLTC®3829isahighperformance3-phasesingleoutput synchronous step-down DC/DC switching controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockablefrequencyofupto770kHz.Powerlossand noise due to ESR of the input capacitors are minimized by operating the three controller output stages out of phase. The LTC3829 can be configured for 6-phase operation, has DCR temperature compensation, and output foldback current limiting. This device features a precision 0.6V reference and a power good indicator. Light load efficiency is optimized by using a choice of output Stage Shedding or Burst Mode operation. A dif- ferential amplifier provides true remote sensing of the output voltage at the point of load. The LTC3829 is available in both low profile 38-pin 5mm × 7mm QFN and Exposed Pad FE packages. FeaTures applicaTions n Optional Nonlinear Control for Fast Response n ±0.75%, 0.6V Reference Accuracy n PWM, Stage Shedding™ or Burst Mode® Operation n High Efficiency: Up to 95% n RSENSE or DCR Current Sensing n Programmable DCR Temperature Compensation n Phase-Lockable Fixed Frequency: 250kHz to 770kHz n True Remote Sense Differential Amplifier n Programmable Active Voltage Positioning (AVP) n Triple N-Channel MOSFET Synchronous Drive n Wide VIN Range: 4.5V to 38V Operation n VOUT Range: 0.6V to 5V without Diffamp n VOUT Range: 0.6V to 3.3V with Diffamp n Clock Input and Output for 6-Phase Operation n Adjustable Soft-Start or VOUT Tracking n 38-Pin (5mm × 7mm) QFN and FE Packages n Notebook and Palmtop Computers n Telecom Systems n Portable Instruments n DC Power Distribution Systems + + INTVCC BOOST1 BOOST2 BOOST3 FREQ ITH TK/SS SENSE1+ SENSE1– PGND BG1 SW1 TG1 4.7µF SW3 SW2 SW1 0.1µF 680pF 100k 5k 20k 20k 22µF 35V 3 VIN 6V TO 28V COUT 470µF 4V 4 VOUT 1.2V 50A SENSE2+ SENSE2– BG2 SW2 TG2 SENSE3+ SENSE3– BG3 SW3 TG3 SGND DIFFOUT VFB DIFFN DIFFP 0.6µH VIN VIN 0.002 0.6µH 0.002 0.6µH 3829 TA01 0.002 VIN LTC3829 L , LT, LTC, LTM, Burst Mode, OPTI-LOOP, PolyPhase, Linear Technology, the Linear logo are registered trademarks and Stage Shedding, No RSENSE are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, 6498466, 6674274, 6611136. LOAD CURRENT (A) 0.1 70 75 80 85 90 1 10 100 3829 TA01b 65 60 55 50 95 100 4 6 8 10 12 2 0 14 16 VIN = 12V VOUT = 1.5V EFFICIENCY POWER LOSS Efficiency |
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