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LTC3835EDHC-1-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3835EDHC-1-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 28 page LTC3835 1 3835fc TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Low IQ Synchronous Step-Down Controller The LTC®3835 is a high performance step-down switching regulator controller that drives an all N-channel synchro- nous power MOSFET stage. A constant-frequency current mode architecture allows a phase-lockable frequency of up to 650kHz. The 80μA no-load quiescent current extends operating life in battery powered systems. OPTI-LOOP compensa- tion allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3835 features a precision 0.8V reference and a power good output indicator. The 4V to 36V input supply range encompasses a wide range of battery chemistries. The TRACK/SS pin ramps the output voltage during start- up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. High Efficiency Synchronous Step-Down Converter n Wide Output Voltage Range: 0.8V ≤ VIN ≤ 10V n Low Operating Quiescent Current: 80μA n OPTI-LOOP® Compensation Minimizes COUT n ±1% Output Voltage Accuracy n Wide VIN Range: 4V to 36V Operation n Phase-Lockable Fixed Frequency 140kHz to 650kHz n Dual N-Channel MOSFET Synchronous Drive n Very Low Dropout Operation: 99% Duty Cycle n Adjustable Output Voltage Soft-Start or Tracking n Output Current Foldback Limiting n Power Good Output Voltage Monitor n Clock Output for PolyPhase® Applications n Output Overvoltage Protection n Low Shutdown IQ: 10μA n Internal LDO Powers Gate Drive from VIN or VOUT n Selectable Continuous, Pulse-Skipping or Burst Mode® Operation at Light Loads n Small 20-Lead TSSOP or 4mm × 5mm QFN Package n Automotive Systems n Telecom Systems n Battery-Operated Digital Devices n Distributed DC Power Systems L, LT, LTC, LTM, Burst Mode, PolyPhase and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5408150, 5481178, 5705919, 5929620, 6304066, 6498466, 6580258, 6611131. Comparison of LTC3835 and LTC3835-1 PART # CLKOUT/ PHASMD EXTVCC PGOOD PACKAGES LTC3835 YES YES YES FE20/4 × 5 QFN LTC3835-1 NO NO NO GN16/3 × 5 DFN VOUT 3.3V 5A 150μF 0.01μF VIN 4V TO 36V ITH SGND PLLIN/MODE VFB SENSE+ SENSE– CLKOUT PLLLPF RUN PGOOD TRACK/SS INTVCC EXTVCC BG PGND LTC3835 3.3μH 0.012Ω 20k 3835 TA01 100pF 330pF 33k 62.5k 4.7μF 0.22μF TG VIN BOOST SW 10μF LOAD CURRENT (mA) 0.01 0.1 1 10 100 1000 10000 3835 TA01b 0.001 1 10 1000 100 0.1 100000 10000 40 50 60 70 80 30 20 10 0 90 100 POWER LOSS EFFICIENCY VIN = 12V; VOUT = 3.3V Efficiency and Power Loss vs Load Current |
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