LT8494
SEPIC/Boost DC/DC Converter with 2A, 70V Switch, and 7μA Quiescent Current
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Alternative Parts
Overview
Features and Benefits
- 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
Product Details
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
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Documentation & Resources
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R530 Reliability Data3/26/2018
-
DC2242A - Demo Manual7/27/2015
Tools & Simulations
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.
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.
LTspice Simulations
Models for the following parts are available in LTspice:
LT8494
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LT8494EFE#PBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT8494EFE#TRPBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT8494EUF#PBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| LT8494EUF#TRPBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| LT8494HFE#PBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT8494HFE#TRPBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT8494IFE#PBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT8494IFE#TRPBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT8494IUF#PBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| LT8494IUF#TRPBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R530 Reliability Data |
PCN-PDN Information
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Sample & Buy
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Lead Times
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.