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LTC3829 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3829 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 54 page  LTC3838 1 3838fa TYPICAL APPLICATION FEATURES DESCRIPTION Dual, Fast, Accurate Step- Down DC/DC Controller with Differential Output Sensing TheLTC®3838isadual,PolyPhase®synchronousstep-down DC/DC switching regulator controller. Two independent channelsdriveallN-channelpowerMOSFETs.Thecontrolled on-time, valley current mode control architecture allows for fast transient response and constant frequency switching in steady-state operation, independent of VIN, VOUT and load current. Its load-release transient detection feature significantly reduces overshoot at low output voltages. Differential output voltage sensing, along with a preci- sion internal reference, offers an accurate ±0.67% output regulation on Channel 1, even if the remote output ground deviates from local ground by ±500mV. The second channel can either provide an independent ±1% output, or together with the first channel of this controller, serve as one of the PolyPhase channels for a single-output voltage. The switching frequency can be programmed from 200kHz to2MHzwithanexternalresistor,andcanbesynchronizedto an external clock. Very low tON and tOFF times allow for near 0% and near 100% duty cycles, respectively. Voltage track- ing soft start-up and multiple safety features are provided. 1.2V/1.5V, 15A, 350kHz, DCR Sense, Step-Down Converter (Refer to Figure 16 for Full Design) APPLICATIONS n Wide VIN Range: 4.5V to 38V, VOUT: 0.6V to 5.5V n ±0.67% Output Voltage Accuracy Over Temperature, Differential Output Voltage Sensing, Allowing Up to ±500mV Line Loss at Remote Ground on Channel 1 n ±1% Output on the Independent 2nd Channel n Controlled On-Time, Valley Current Mode Control n Fast Load Transient Response n Detect Transient (DTR) Reduces VOUT Overshoot n Frequency Programmable from 200kHz to 2MHz, Synchronizable to External Clock n tON(MIN) = 30ns, tOFF(MIN) = 90ns n RSENSE or Inductor DCR Current Sensing n Overvoltage Protection and Current Limit Foldback n Power Good Output Voltage Monitor n Output Voltage Tracking and Adjustable Soft Start-Up n Thermally Enhanced 38-Pin (5mm × 7mm) QFN and TSSOP packages n Distributed Power Systems n Point-of-Load Converters n Computing Systems n Data Communication Systems L, LT, LTC, LTM, PolyPhase, OPTI-LOOP, Linear Technology and the Linear logo are registered trademarks and Hot Swap, No RSENSE and UltraFast are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611. 115k SENSE1– SENSE1+ SENSE2– SENSE2+ VIN BOOST1 DRVCC1 TG1 BG1 PGND BG2 DRVCC2 VOUTSENSE1+ VOUTSENSE1– TRACK/SS1 ITH1 VFB2 TRACK/SS2 ITH2 4.7μF VOUT2 1.5V 15A VIN 4.5V TO 38V VOUT1 1.2V 15A 0.1μF 0.1μF 330μF 2 330μF 2 10k 10k 15k 10k 0.56μH 0.56μH 3838 TA01a RT SGND SW1 BOOST2 LTC3838 TG2 INTVCC SW2 + + Efficiency/Power Loss LOAD CURRENT (A) 0.1 40 80 90 100 1 EFFICIENCY 10 3838 F16b 70 60 50 0 1.5 2.0 2.5 1.0 0.5 VIN = 12V VOUT = 1.2V FORCED CONTINUOUS MODE DISCONTINUOUS MODE POWER LOSS |
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