LT8631
Info : RECOMMENDED FOR NEW DESIGNS
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LT8631

100V, 1A Synchronous Micropower Step-Down Regulator

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 6
1ku List Price Starting From $4.31
Features
  • Ultrawide Input Voltage Range: 3V to 100V
  • Output Voltage Range: 0.8V to 60V
  • Internal Synchronous Switches
  • Low Ripple Burst Mode® Operation:
    • 16μA IQ at 12VIN to 5VOUT Output Ripple <10mVP-P
    • 7μA IQ at 48VIN to 5VOUT Output Ripple <10mVP-P
  • Low Dropout: 99% Maximum Duty Cycle
  • Peak Current Mode Control
  • Fixed Frequency Operation: 100kHz to 1MHz
  • Synchronization Input
  • Programmable Undervoltage Lockout
  • Power Good Flag
  • Flexible Output Voltage Tracking
  • Short-Circuit Protection
  • Low Shutdown Current: 5μA
  • Tolerates Pin Open/Short Faults
  • Thermally Enhanced 20-Lead TSSOP with High Voltage Lead Spacing
Additional Details
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The LT8631 is a current mode PWM step-down DC/DC converter with internal synchronous switches that provide current for output loads up to 1A. The wide input range of 3V to 100V makes the LT8631 suitable for regulating power from a wide variety of sources, including automotive and industrial systems and 36V to 72V telecom supplies. Low ripple Burst Mode operation enables high efficiency operation down to very low output currents while keeping the output ripple below 10mVP-P. Resistor programmable 100kHz to 1MHz frequency range and synchronization capability enable optimization between efficiency and external component size. The soft-start feature controls the ramp rate of the output voltage, eliminating input current surge during start-up, while also providing output tracking. A power good flag signals when the output voltage is within ±7.5% of the regulated output. Undervoltage lockout can be programmed using the EN/UV pin. Shutdown mode reduces the total quiescent current to < 5μA. The LT8631 is available in a 20-lead TSSOP package with exposed pad for low thermal resistance and high voltage lead spacing.

APPLICATIONS

  • Telecom Supplies
  • Distributed Supply Regulation
Part Models 6
1ku List Price Starting From $4.31

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT8631EFE#PBF
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LT8631EFE#TRPBF
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LT8631HFE#PBF
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LT8631HFE#TRPBF
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LT8631IFE#PBF
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LT8631IFE#TRPBF
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Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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

LT8631EFE#PBF

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LT8631EFE#TRPBF

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LT8631HFE#PBF

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LT8631HFE#TRPBF

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LT8631IFE#PBF

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Filter by Model

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Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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

LT8631EFE#PBF

PRODUCTION

LT8631EFE#TRPBF

PRODUCTION

LT8631HFE#PBF

PRODUCTION

LT8631HFE#TRPBF

PRODUCTION

LT8631IFE#PBF

PRODUCTION

LT8631IFE#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2110A

LT8631EFE Demo Board | Synchronous Buck, 6.5V ≤ VIN ≤ 100V; VOUT = 5V @ 1A

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DC2110A

LT8631EFE Demo Board | Synchronous Buck, 6.5V ≤ VIN ≤ 100V; VOUT = 5V @ 1A

LT8631EFE Demo Board | Synchronous Buck, 6.5V ≤ VIN ≤ 100V; VOUT = 5V @ 1A

Product Detail

Demonstration circuit 2110A is a monolithic step-down converter featuring LT8631. The demo board is designed for 5V output from a 6.5V to 100V input at 400kHz switching frequency. The wide input range makes it suitable for regulating power from a wide variety of sources, including automotive, industrial systems and telecom supplies. The LT8631 is a compact, high efficiency synchronous monolithic step-down switching regulator. The power switch, compensation and other necessary circuits are inside of the LT8631 to minimize external components and simplify design.

Tools & Simulations

Tools & Simulations 2

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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