LTC3835 Datasheet

• Wide Output Voltage Range: 0.8V ≤ V_OUT ≤ 10V
• Low Operating Quiescent Current: 80μA
• OPTI-LOOP^® Compensation Minimizes C_OUT
• 1% Output Voltage Accuracy
• Wide V_IN Range: 4V to 36V Operation
• 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 I_Q: 10μA
• Internal LDO Powers Gate Drive from V_IN or V_OUT
• Selectable Continuous, Pulse-Skipping or Burst Mode^® Operation at Light Loads
• Small 20-Lead TSSOP or 4mm × 5mm QFN Package
• AEC-Q100 Qualified for Automotive Applications

• Automotive Systems
• Telecom Systems
• Battery-Operated Digital Devices
• Distributed DC Power Systems

The LTC3835 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 80μA no-load quiescent current extends operating life in battery powered systems. OPTI-LOOP compensation 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 startup. Current foldback limits MOSFET heat dissipation during short-circuit conditions.