LT8494
RECOMMENDED FOR NEW DESIGNSSEPIC/Boost DC/DC Converter with 2A, 70V Switch, and 7μA Quiescent Current
- Part Models
- 10
- 1ku List Price
- Starting From $4.33
Overview
- 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
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
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT8494EFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT8494EFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT8494EUF#PBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LT8494EUF#TRPBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LT8494HFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT8494HFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT8494IFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT8494IFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT8494IUF#PBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LT8494IUF#TRPBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 6, 2022 - 22_0068 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 | PRODUCTION | |
| LT8494IFE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| LT8495 | RECOMMENDED FOR NEW DESIGNS | SEPIC/Boost Converter with 2A, 70V Switch, 9μA Quiescent Current, POR and Watchdog Timer |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT8494
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.
Evaluation Kits
LT8494EFE Demo Board | SEPIC, 3V ≤ VIN ≤ 60V; VOUT = 5V @ 1A