LT8494
Info : RECOMMENDED FOR NEW DESIGNS
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LT8494

SEPIC/Boost DC/DC Converter with 2A, 70V Switch, and 7μA Quiescent Current

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 10
1ku List Price Starting From $3.42
Features
  • Low Ripple Burst Mode® Operation:
    • 7μA IQ at 12VIN to 5VOUT
    •  Output Ripple (<10mV Typ.)
  • Dual Supply Pins:
    • Improves Efficiency
    • Reduces Minimum Supply Voltage to ~1V after
    • Start-Up to Extend Battery Life
  • Wide Input Voltage Range of ~1V to 60V (2.5V to 32V for Start-Up)
  • PG Functional for Input Supply Down to 1.3V
  • FMEA Fault Tolerant in TSSOP Package
  • Fixed Frequency PWM, SEPIC/BOOST/FLYBACK Topologies
  • NPN Power Switch: 2A/70V
  • Programmable Switching Frequency: 250kHz to 1.5MHz
  • UVLO Programmable on SWEN Pin
  • Soft-Start Programmable with One Capacitor
  • Small 20-Lead QFN or 20-Lead TSSOP Packages
Additional Details
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The LT8494 is an adjustable frequency (250kHz to 1.5MHz) monolithic switching regulator. Quiescent current can be less than 7μA when operating and is ~0.3μA when SWEN is low. The LT8494 can be configured as either a SEPIC, boost or flyback converter.

The low ripple Burst Mode operation maintains high efficiency at low output current while keeping output ripple below 10mV. Dual supply pins (VIN and BIAS) allow the part to automatically operate from the most efficient supply. Input supply voltage can be up to 60V for SEPIC topologies and up to 32V (with ride-through up to 60V) for boost and flyback topologies. After start-up, battery life is extended since the part can draw current from its output (BIAS) even when VIN voltage drops below 2.5V.

Using a resistor divider on the SWEN pin provides a programmable undervoltage lockout (UVLO) for the converter. A power good flag signals when VOUT reaches 92% of the programmed output voltage.

Additional features such as frequency foldback and soft-start are integrated. The LT8494 is available in 20-lead QFN and 20-lead TSSOP packages with exposed pads for low thermal resistance. Fault tolerance in the TSSOP allows for adjacent pin shorts or an open without raising the output voltage above its programmed value.

Applications

  • Automotive ECU Power
  • Power for Portable Products
  • Industrial Supplies
Part Models 10
1ku List Price Starting From $3.42

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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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

LT8494EFE#PBF

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LT8494EFE#TRPBF

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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

LT8494EFE#PBF

PRODUCTION

LT8494EFE#TRPBF

PRODUCTION

LT8494HFE#PBF

PRODUCTION

LT8494HFE#TRPBF

PRODUCTION

LT8494IFE#PBF

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2242A

LT8494EFE Demo Board | SEPIC, 3V ≤ VIN ≤ 60V; VOUT = 5V @ 1A

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DC2242A

LT8494EFE Demo Board | SEPIC, 3V ≤ VIN ≤ 60V; VOUT = 5V @ 1A

LT8494EFE Demo Board | SEPIC, 3V ≤ VIN ≤ 60V; VOUT = 5V @ 1A

Product Detail

Demonstration circuit 2242A is a monolithic SEPIC converter featuring LT8494. The demo board is designed for 5V output from a 3V to 60V input at 450kHz switching frequency. The max output current is 1A when the input voltage is above 12V, and is reduced with lower input voltage. The quiescent current of LT8494 is less than 7μA when operating. Dual supply pins (VIN and BIAS) allow the part to automatically operate from the most efficient supply.

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.

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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