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LTC3858 Datasheet

LTC3858 Datasheet

Low IQ, Dual 2-Phase Synchronous Step-Down Controller
Part No.: LTC3858
Page: 38 Pages
Size: 408 KB
Manufacturer: Linear Technology
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Views: 0
Update Time: 2024-12-17 13:34:29
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LTC3858 Datasheet Applicable Part

Part No. Packing SPQ Marking MSL Pins Temp Range Package Description Buy
LTC3858EUH#PBF Tube 73 3858 1 32 -40°C ~ 125°C 32-Lead (5mm × 5mm) Plastic QFN  
LTC3858EUH#TRPBF Reel 2500 3858 1 32 -40°C ~ 125°C 32-Lead (5mm × 5mm) Plastic QFN  
LTC3858IUH#PBF Tube 73 3858 1 32 -40°C ~ 125°C 32-Lead (5mm × 5mm) Plastic QFN  
LTC3858IUH#TRPBF Reel 2500 3858 1 32 -40°C ~ 125°C 32-Lead (5mm × 5mm) Plastic QFN  
SPQ:Standard Pack Quantity;MSL:Moisture Sensitivity Level

LTC3858 Datasheet(PDF)

LTC3858 Datasheet(Picture)

LTC3858 Features

  • 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 Latch-Off Protection During Short Circuit
  • Low Shutdown IQ: 8μA
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • No Current Foldback During Start-Up
  • Small 5mm × 5mm QFN Package

LTC3858 Applications

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

LTC3858 Description

The LTC3858 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 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 latch-off feature protects the circuit in short-circuit conditions.

For a leaded 28-lead SSOP package with a fixed current limit and one PGOOD output, without phase modulation or a clock output, see the LTC3858-1 data sheet.

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