ADI LTC3858EUFD-1#TRPBF

The LTC3858–1 is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. Power loss and noise due to the input capacitor ESR are minimized by operating the two controller outputs out of phase. The 170μA 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 LTC3858-1 features a precision 0.8V reference and a power good output indicator. A wide 4V to 38V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries. Independent soft-start pins for each controller ramp the output voltages during start-up. The output Latchoff feature protects the circuit in short-circuit conditions.

• Low Operating IQ: 170μA (One Channel On)
• Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
• Wide VIN Range: 4V to 38V
• RSENSE or DCR Current Sensing
• Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
• OPTI-LOOP Compensation Minimizes COUT
• Phase-Lockable Frequency (75kHz-850kHz)
• Programmable Fixed Frequency (50kHz-900kHz)
• Selectable Continuous, Pulse-Skipping or Burst Mode Operation at Light Loads
• Very Low Dropout Operation: 99% Duty Cycle
• Adjustable Output Voltage
• Soft-Start
• Power Good Output Voltage Monitor
• Output Overvoltage Protection
• Output Latchoff Protection During Short Circuit
• Low Shutdown IQ: 8μA
• Internal LDO Powers Gate Drive from VIN or EXTVCC
• No Current Foldback During Start-Up
• Tiny 4mm×5mm QFN and Narrow SSOP Packages

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