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LTC3876 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3876 Datasheet(HTML) 1 Page - Linear Technology |
1 / 50 page LTC3839 1 3839fa TYPICAL APPLICATION FEATURES DESCRIPTION Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller with Differential Output Sensing The LTC®3839 is a 2-phase, single-output PolyPhase® synchronous step-down switching regulator controller that drives all N-channel power MOSFETs. The controlled 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, even if the remote output ground deviates from local ground by ±500mV. The switching frequency can be programmed from 200kHz to 2MHz with an external resistor and can be synchronized to an external clock. Very low tON and tOFF times allow for near 0% and near 100% duty cycles, respectively. Volt- age tracking soft start-up and multiple safety features are provided. 3.3V/25A Output, 2MHz Step-Down Converter (Refer to Figure 20 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 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 Up to 12-Phase Operation 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 32-Pin (5mm × 5mm) QFN Package 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 and Stage Shedding 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. Efficiency/Power Loss LOAD CURRENT (A) 0.1 80 90 100 1 10 100 3839 TA01b 70 60 50 6 10 8 4 2 0 VIN = 5V FORCED CONTINUOUS MODE LOSS DCM LOSS FORCED CM DISCONTINUOUS MODE 18.7k SENSE1– SENSE1+ SENSE2– SENSE2+ VIN BOOST1 DRVCC1 TG1 MODE/PLLIN CLKOUT PHASMD RUN DTR BG1 PGND BG2 DRVCC2 VOUTSENSE+ VOUTSENSE– TRACK/SS ITH 4.7μF VIN 4.5V TO 14V VOUT 3.3V 25A 0.1μF 0.1μF 100μF 6 45.3k 10k 0.3μH 0.3μH 3839 TA01a RT SGND SW1 BOOST2 LTC3839 TG2 INTVCC SW2 + |
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