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LTC3834 - 30μA IQ Synchronous Step-Down Controller

The LTC3834 is a high performance step-down switching regulator controller that drives an all N-channel synchronous power MOSFET stage. A constant-frequency current mode architecture allows a phase-lockable frequency of up to 650kHz. The 30μA no-load quiescent current extends operating life in battery powered systems. OPTI-LOOP compensation al- lows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3834 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. A reduced feature set version of the part (LTC3834-1) is available in a smaller, lower pin count package.

Features Wide Output Voltage Range: 0.8V ≤VOUT ≤10V Low Operating Quiescent Current: 30μA OPTI-LOOP Compensation Minimizes COUT ±1% Output Voltage Accuracy Wide VIN Range: 4V to 36V Phase-Lockable Fixed Frequency 140kHz to 650kHz Dual N-Channel MOSFET Synchronous Drive Very Low Dropout Operation: 99% Duty Cycle Adjustable Output Voltage Soft-Start or Tracking Output Current Foldback Limiting Power Good Output Voltage Monitor Clock Output for PolyPhase Applications Output Overvoltage Protection Low Shutdown IQ: 4μA Internal LDO Powers Gate Drive from VIN or VOUT Selectable Continuous, Pulse-Skipping or Burst Mode Operation at Light Loads Small 20-Lead TSSOP or 4mm × 5mm QFN Package Typical Application

Applications Automotive Systems Telecom Systems Battery-Operated Digital Devices Distributed DC Power Systems Packaging

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