LTC3126
Info : RECOMMENDED FOR NEW DESIGNS
searchIcon
cartIcon

LTC3126

42V, 2.5A Synchronous Step-Down Regulator with No-Loss Input PowerPath

Show More showmore-icon

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 12
1ku List Price Starting From $4.65
Features
  • Seamless, Automatic Transition Between Two Input Power Sources
  • Wide Input Voltage Range: 2.4V to 42V
  • Wide Output Voltage Range: 0.818V to VIN
  • Up to 2.5A Continuous Output Current
  • Pin Selectable Priority and Ideal Diode-OR Modes
  • Burst Mode® Operation, IQ = 2μA
  • 95% Efficiency at 1A, VIN = 12V, VOUT = 5V
  • 1μA Current in Shutdown
  • Programmable Input UVLO Thresholds
  • Input Valid, Priority Channel and PGOOD Indicators
  • 200kHz to 2.2MHz Fixed Frequency PWM
  • Synchronizable to an External Clock
  • Current Mode Control with 60ns Minimum On-Time
  • Minimal External Components
  • Thermally Enhanced 28-Lead 4mm × 5mm QFN and 28-Lead TSSOP Packages
Additional Details
show more Icon

The LTC3126 is a high efficiency synchronous buck converter with an internal no-loss PowerPath supporting seamless operation from two separate input power sources. Pin selectable ideal diode-OR and priority input modes with user programmable undervoltage lockout thresholds provide full control over the transition between the input power sources. The fast, automatic switchover provided by the internal PowerPath eliminates the need for hold-up capacitors and minimizes disturbances on the output rail. An active input channel indicator and independent input and output power good signals provide complete feedback of the power system status.

A wide 2.4V to 42V input voltage range, 2.5A output current capability and 2μA Burst Mode operation quiescent current facilitate use of the LTC3126 with a wide variety of power sources including supercapacitors, automotive batteries, unregulated wall adapters and single to multicell stacks of most battery chemistries. Additional features include 1μA current in shutdown, internal soft-start and thermal protection. The LTC3126 is available in thermally enhanced 28-lead 4mm × 5mm QFN and 28-lead TSSOP packages.

Applications

  • Portable Industrial/Communications Test Equipment
  • Battery and Supercapacitor Backup Power
  • Automotive Power with Battery Backup
  • Uninterruptible Power Supplies
Part Models 12
1ku List Price Starting From $4.65

close icon
Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3126EFE#PBF
  • HTML
  • HTML
LTC3126EFE#TRPBF
  • HTML
  • HTML
LTC3126EUFD#PBF
  • HTML
  • HTML
LTC3126EUFD#TRPBF
  • HTML
  • HTML
LTC3126HFE#PBF
  • HTML
  • HTML
LTC3126HFE#TRPBF
  • HTML
  • HTML
LTC3126IFE#PBF
  • HTML
  • HTML
LTC3126IFE#TRPBF
  • HTML
  • HTML
LTC3126IUFD#PBF
  • HTML
  • HTML
LTC3126IUFD#TRPBF
  • HTML
  • HTML
LTC3126MPFE#PBF
  • HTML
  • HTML
LTC3126MPFE#TRPBF
  • HTML
  • HTML

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3126EFE#PBF

PRODUCTION

LTC3126EFE#TRPBF

PRODUCTION

LTC3126HFE#PBF

PRODUCTION

LTC3126HFE#TRPBF

PRODUCTION

LTC3126IFE#PBF

PRODUCTION

LTC3126IFE#TRPBF

PRODUCTION

LTC3126MPFE#PBF

PRODUCTION

LTC3126MPFE#TRPBF

PRODUCTION

Apr 11, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

LTC3126EFE#PBF

PRODUCTION

LTC3126EFE#TRPBF

PRODUCTION

LTC3126EUFD#PBF

PRODUCTION

LTC3126EUFD#TRPBF

PRODUCTION

LTC3126HFE#PBF

PRODUCTION

LTC3126HFE#TRPBF

PRODUCTION

LTC3126IFE#PBF

PRODUCTION

LTC3126IFE#TRPBF

PRODUCTION

LTC3126IUFD#PBF

PRODUCTION

LTC3126IUFD#TRPBF

PRODUCTION

Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3126EUFD#PBF

PRODUCTION

LTC3126EUFD#TRPBF

PRODUCTION

LTC3126IUFD#PBF

PRODUCTION

LTC3126IUFD#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

arrow down

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3126EFE#PBF

PRODUCTION

LTC3126EFE#TRPBF

PRODUCTION

LTC3126HFE#PBF

PRODUCTION

LTC3126HFE#TRPBF

PRODUCTION

LTC3126IFE#PBF

PRODUCTION

LTC3126IFE#TRPBF

PRODUCTION

LTC3126MPFE#PBF

PRODUCTION

LTC3126MPFE#TRPBF

PRODUCTION

Apr 11, 2019

- 19_0067

arrow down

Notification of Wafer Fab Location Change for 0.35 BCD Process

LTC3126EFE#PBF

PRODUCTION

LTC3126EFE#TRPBF

PRODUCTION

LTC3126EUFD#PBF

PRODUCTION

LTC3126EUFD#TRPBF

PRODUCTION

LTC3126HFE#PBF

PRODUCTION

LTC3126HFE#TRPBF

PRODUCTION

LTC3126IFE#PBF

PRODUCTION

LTC3126IFE#TRPBF

PRODUCTION

LTC3126IUFD#PBF

PRODUCTION

LTC3126IUFD#TRPBF

PRODUCTION

Feb 20, 2022

- 21_0269

arrow down

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3126EUFD#PBF

PRODUCTION

LTC3126EUFD#TRPBF

PRODUCTION

LTC3126IUFD#PBF

PRODUCTION

LTC3126IUFD#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC2215A

LTC3126EUFD Demo Board | Dual Input Sync Buck, 4.3V ≤ VIN1 ≤ 42V, 6V ≤ VIN2 ≤ 8.4V (Operational to 42V), VOUT = 3.3V @ 2.5A

zoom

DC2215A

LTC3126EUFD Demo Board | Dual Input Sync Buck, 4.3V ≤ VIN1 ≤ 42V, 6V ≤ VIN2 ≤ 8.4V (Operational to 42V), VOUT = 3.3V @ 2.5A

LTC3126EUFD Demo Board | Dual Input Sync Buck, 4.3V ≤ VIN1 ≤ 42V, 6V ≤ VIN2 ≤ 8.4V (Operational to 42V), VOUT = 3.3V @ 2.5A

Product Detail

Demonstration Circuit 2215A, features the LTC3126, a synchronous buck converter with an integrated lossless input PowerPath™. Pin selectable (JP2) ideal diode-OR and priority input modes, with programmable undervoltage lockout thresholds provide control over the transition between input sources. The unique all N-channel architecture provides efficient operation from either of two input sources to a programmable output voltage. In this application the valid input voltage range is set to be from 4.3V to 42V on VIN1 and from 6V to 8.4V on VIN2 providing flexibility and voltage margin for a variety of applications and power sources. VIN2 can operate to 42V. Other input voltage ranges are possible by adjusting the VSET1/2 threshold values (set by resistors R9 thru R12) accordingly.

Tools & Simulations

Tools & Simulations 1

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.

Recently Viewed