LTC1628

PRODUCTION

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

Data Sheet Product Selection Table
Viewing:

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 (LTC1628-PG)
  • DC Programmed 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
  • Small 28-Lead SSOP Package
  • Selectable Constant Frequency or Burst Mode® Operation
  • Available in 5mm × 5mm QFN and 28-Pin SSOP Packages

The LTC1628/LTC1628-PG are high performance dual step-down switching regulator controllers that drive all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows adjustment of the frequency 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. The LTC1628-PG includes a power good output pin that replaces the FLTCPL, fault coupling control pin of the LTC1628.

Applications

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

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Reliability Data 1

User Guide 5

Application Note 2

Design Note 9

Technical Articles 6

Data Sheet

This is the most up-to-date revision of the Data Sheet.

Learn More
Add to myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

Create New Project

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Tools & Simulations

LTspice

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
DC543A

LTC2920-2CMS8 LTC1628CG | LTC2920 with Dual DC to DC Converter, 7V to 24V Input, 5V @ 12A max = VOUT1, 3.3V @ 12A max = VOUT2

Buy Now View Details

Product Details

DC543A Demo Board for:
LTC1628 High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
LTC2920 Single/Dual Power Supply Margining Controller

eval board
schematic 2
DC236C-A

LTC1628CG | High Efficiency, Multi-Phase 2-Output, Current Mode Controller, 5-30 VIN, 5V/4A and 3.3V/4A Output

Buy Now View Details

Product Details

DC236C-A: Demo Board for the LTC1628 High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator.

eval board
schematic 3
DC264A

LTC1628CG | Multi-Phase, 3 Output Regulator, 7-28VIN; 5V @ 3A, 3.3V @ 4A and a Linear 12V @ 150mA

Buy Now View Details

Product Details

DC264A: Demo Board for the LTC1628 High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator.

eval board
schematic 4
DC265A

LTC1628CG | Multi-Phase, 3 Output Regulator, 7-28VIN; 5V @ 3A, 3.3V @ 4A and a Synchronous 12V @ 200mA

Buy Now View Details

Product Details

DC265A: Demo Board for the LTC1628 High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator.

eval board
schematic 5
DC236C-C

LTC1628CG-PG | High Efficiency, Multi-Phase 2-Output, Current Mode Controller, 5-30 VIN, 5V/4A and 3.3V/4A Output

Buy Now View Details

Product Details

DC236C-C: Demo Board for the LTC1628 High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator.

eval board
schematic 6
DC271A

LTC1628CG | Dual Phase Multi-Output High Current Converter, 7V to 24V Input, VOUT1 = 5V @ 12A Max., VOUT2 = 3.3V @ 12A Max.

Buy Now View Details

Product Details

DC271A: Demo Board for the LTC1628 High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator.

eval board
schematic 7
DC392A-A

LTC1628CUH Demo Board | Dual Output, 5V to 24VIN, 5VOUT1 @ 4A, 3.3VOUT2 @ 5A

Buy Now View Details

Product Details

Demonstration circuit 392 is a dual output, step-down, synchronous buck converter featuring either the 150kHz to 300kHz LTC1628EUH controller (DC392A-A), the 250kHz to 550kHz LTC3728EUH (DC392A-B) or 250kHz to 550kHz LTC3728LUH (DC392A-C). It operates with an input voltage range of 7V to 24V and provides 3.3V @ 5A and 5V @ 4A at its output.
DC543A
LTC2920-2CMS8 LTC1628CG | LTC2920 with Dual DC to DC Converter, 7V to 24V Input, 5V @ 12A max = VOUT1, 3.3V @ 12A max = VOUT2
DC543A - Schematic
DC236C-A
LTC1628CG | High Efficiency, Multi-Phase 2-Output, Current Mode Controller, 5-30 VIN, 5V/4A and 3.3V/4A Output
DC236C-A - Schematic
DC264A
LTC1628CG | Multi-Phase, 3 Output Regulator, 7-28VIN; 5V @ 3A, 3.3V @ 4A and a Linear 12V @ 150mA
DC264A - Schematic
DC265A
LTC1628CG | Multi-Phase, 3 Output Regulator, 7-28VIN; 5V @ 3A, 3.3V @ 4A and a Synchronous 12V @ 200mA
DC265A - Schematic
DC236C-C
LTC1628CG-PG | High Efficiency, Multi-Phase 2-Output, Current Mode Controller, 5-30 VIN, 5V/4A and 3.3V/4A Output
DC236C-A - Schematic
DC271A
LTC1628CG | Dual Phase Multi-Output High Current Converter, 7V to 24V Input, VOUT1 = 5V @ 12A Max., VOUT2 = 3.3V @ 12A Max.
DC271A - Schematic
DC392A-A
LTC1628CUH Demo Board | Dual Output, 5V to 24VIN, 5VOUT1 @ 4A, 3.3VOUT2 @ 5A
DC392A-A - Schematic

Latest Discussions

No discussions on LTC1628 yet. Have something to say?

Start a Discussion on EngineerZone®

Recently Viewed