LTC3850-2

PRODUCTION

Dual, 2-Phase Synchronous Step-Down Switching Controller

Data Sheet (Rev. A) Product Selection Table
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Overview

  • Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • High Efficiency: Up to 95%
  • RSENSE or DCR Current Sensing
  • ±1% 0.8V Output Voltage Accuracy
  • Phase-Lockable Fixed Frequency 250kHz to 780kHz
  • Supports Pre-Biased Output
  • Dual N-Channel MOSFET Synchronous Drive
  • Wide VIN Range: 4V to 30V Operation
  • Adjustable Soft-Start Current Ramping or Tracking
  • Foldback Output Current Limiting
  • Output Overvoltage Protection
  • Power Good Output Voltage Monitor
  • 28-Pin Narrow SSOP Package
  • AEC-Q100 Qualified for Automotive Applications

The LTC3850-2 is a high performance dual synchronous step-down switching regulator controller that drives all N-channel power MOSFET stages. A constant-frequency current mode architecture allows a phase-lockable frequency of up to 780kHz. Power loss and supply noise are minimized by operating the two controller output stages out of phase.

OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3850-2 features a precision 0.8V reference and a power good output indicator. A wide 4V to 30V input supply range encompasses most battery chemistries and intermediate bus voltages.

Independent TK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, or continuous inductor current mode and allows the IC to be synchronized to an external clock.

The LTC3850-2 is identical to the LTC3850-1, except they have different pin assignments.


 Features
LTC3850 SSOP-28 and QFN-28 Packages
LTC3850-1 ILIM function replaced with an EXTVCC function, SSOP-28 package only
LTC3850-2 The LTC3850-2 is identical to the LTC3850-1 SSOP-28, except they have different pin-outs

APPLICATIONS

  • Notebook and Palmtop Computers
  • Portable Instruments
  • Battery-Operated Digital Devices
  • DC Power Distribution Systems
LTC3850-2
Dual, 2-Phase Synchronous Step-Down Switching Controller
LTC3850-2 Application Circuit LTC3850-2 Performance Graph LTC3850-2 Pin Configuration
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Documentation

Data Sheet 1

Reliability Data 1

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Software Resources

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Hardware Ecosystem

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3850
  • LTC3850-1
  • LTC3850-2

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

  • LTC3850
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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