LTC1628-SYNC

PRODUCTION

High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator

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Overview

  • Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • OPTI-LOOP® Compensation Minimizes COUT
  • Dual N-Channel MOSFET Synchronous Drive
  • ±1% Output Voltage Accuracy
  • Power Good Output Voltage Monitor
  • Phase-Lockable Fixed Frequency 150kHz to 300kHz
  • Wide VIN Range: 3.5V to 36V Operation
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Soft-Start Current Ramping
  • Foldback Output Current Limiting
  • Latched Short-Circuit Shutdown with Defeat Option
  • Output Overvoltage Protection
  • Remote Output Voltage Sense
  • Low Shutdown IQ: 20µA
  • 5V and 3.3V Standby Regulators
  • Selectable Constant Frequency or Burst Mode® Operation
  • Small 28-Lead SSOP Package

The LTC1628-SYNC 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 phase-lockable frequency of up to 300kHz. Power loss and noise due to the ESR of the input capacitors 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 precision 0.8V reference and power good output indicator are compatible with future microprocessor generations, and a wide 3.5V to 30V (36V maximum) input supply range encompasses all battery chemistries.

A RUN/SS pin for each controller provides both soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when overcurrent latchoff is disabled. Output overvoltage protection circuitry latches on the bottom MOSFET until VOUT returns to normal. The FCB mode pin can select among Burst Mode, constant frequency mode and continuous inductor current mode or regulate a secondary winding.

Applications

  • Notebook and Palmtop Computers, PDAs
  • Telecom Systems
  • Battery-Operated Digital Devices
  • DC Power Distribution Systems
LTC1628-SYNC
High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Data Sheet

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Software Resources

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC1628
  • LTC1628-PG
  • LTC1628-SYNC
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.

Evaluation Kits

eval board
schematic 1
DC352A

LTC1629CG LTC1628-SYNC | PolyPhase Dual Output High Current Power Supply, 5V to 14VIN, 1.6VOUT @ 52A Max., 2.5VOUT @ 15A Max (Thru-Hole Input Caps)

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Product Details

DC352A Demo Board for:
LTC1629 PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator
LTC1628-SYNC High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
DC352A
LTC1629CG LTC1628-SYNC | PolyPhase Dual Output High Current Power Supply, 5V to 14VIN, 1.6VOUT @ 52A Max., 2.5VOUT @ 15A Max (Thru-Hole Input Caps)
DC352A - Schematic

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