LT8630 - 100V, 0.6A Synchronous Micropower Step-Down High Efficiency Switching Regulator

Features

  • Ultrawide Input Voltage Range: 3V to 100V
  • Boundary Mode Switching for Highest Efficiency
  • Output Voltage Range: 0.8V to 60V
  • Internal Synchronous Switches
  • Burst Mode® Operation:
    16μA IQ at 12VIN to 5VOUT
    7μA IQ at 48VIN to 5VOUT
  • Low Dropout: 99% Maximum Duty Cycle
  • Peak Current Mode Control
  • 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

Typical Application

LT8630 Typical Application
LT8630 Typical Application

Description

The LT®8630 is a current mode PWM step-down DC/DC converter with internal synchronous switches that provide current for output loads up to 0.6A. The wide input range of 3V to 100V makes the LT8630 suitable for regulating power from a wide variety of sources, including automotive and industrial systems and 36V to 72V telecom supplies. Variable frequency boundary mode switching maximizes efficiency across a wide range of input voltages. Low ripple Burst Mode operation enables high efficiency operation down to very low output currents while keeping the output ripple below 5mV. 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 LT8630 is available in a 20-lead TSSOP package with exposed pad for low thermal resistance and high voltage lead spacing.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT8630EFE#PBF TSSOP-20 FE E 05-08-1924 Yes
LT8630EFE#TRPBF TSSOP-20 FE E 05-08-1924 Yes
LT8630IFE#PBF TSSOP-20 FE I 05-08-1924 Yes
LT8630IFE#TRPBF TSSOP-20 FE I 05-08-1924 Yes


LT8630 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT8630EFE#PBF TSSOP-20 E $5.14 $3.60 Yes
LT8630EFE#TRPBF TSSOP-20 E $5.20 $3.66 Yes
LT8630IFE#PBF TSSOP-20 I $5.66 $3.96 Yes
LT8630IFE#TRPBF TSSOP-20 I $5.72 $4.02 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2504A LT8630 Demo Board | Sync Buck, 13V ≤ VIN ≤ 100V, VOUT = 12V @ 600mA $249.00
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Click here to view our complete list of demo boards

Applications

  • Automotive Supplies
  • Telecom Supplies
  • Distributed Supply Regulation

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, 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

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT8630

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