LT8495 - SEPIC/Boost Converter with 2A, 70V Switch, 9μA Quiescent Current, POR and Watchdog Timer
Features
- Wide Input Voltage Range of ~1V to 60V (2.5V to 32V for Start-Up)
- Low Ripple Burst Mode® Operation
- 9μA IQ at 12VIN to 5.0VOUT
- Output Ripple (<10mV Typ.)
- Dual Supply Pins:
- Improves Efficiency
- Reduces Minimum Supply Voltage to ~1V after Start-Up to Extend Battery Life
- Integrated 2A/70V Power Switch
- Programmable Watchdog Timer Can Operate When VIN Supply Is Removed
- Programmable Power-On Reset Timer (POR) with RST Functional for Input Supply Down to 1.3V
- FMEA Fault Tolerant in TSSOP Package
- Fixed Frequency PWM, SEPIC/BOOST/FLYBACK Topologies
- Programmable Switching Frequency: 250kHz to 1.5MHz
- UVLO Programmable on SWEN and RSTIN Pins
- Soft-Start Programmable with One Capacitor
- Small 20-Lead QFN or 20-Lead TSSOP Packages
Typical Application
Description
The LT®8495 is an adjustable frequency (250kHz to 1.5MHz) monolithic switching regulator with a power-on reset and watchdog timer. Quiescent current can be less than 9μA when operating and is ~0.3μA when SWEN, WDE and RSTIN are low. Configurable as 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.
The reset and watchdog timeout periods are independently adjustable using external capacitors. Using a resistor divider on the SWEN pin provides a programmable undervoltage lockout (UVLO) for the converter. A resistor divider connected to RSTIN provides UVLO control that asserts the RST pin.
Additional features such as frequency foldback and softstart are integrated. Fault tolerance in the TSSOP allows for adjacent pin shorts or an open without raising the output voltage above its programmed value. The LT8495 is available in 20-lead QFN and 20-lead TSSOP packages with exposed pads for low thermal resistance.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT8495EFE#PBF | TSSOP-20 | FE | E | 05-08-1663 (CB) | Yes |
| LT8495EFE#TRPBF | TSSOP-20 | FE | E | 05-08-1663 (CB) | Yes |
| LT8495EUF#PBF | 4x4 QFN-20 | UF | E | 05-08-1710 | Yes |
| LT8495EUF#TRPBF | 4x4 QFN-20 | UF | E | 05-08-1710 | Yes |
| LT8495HFE#PBF | TSSOP-20 | FE | H | 05-08-1663 (CB) | Yes |
| LT8495HFE#TRPBF | TSSOP-20 | FE | H | 05-08-1663 (CB) | Yes |
| LT8495IFE#PBF | TSSOP-20 | FE | I | 05-08-1663 (CB) | Yes |
| LT8495IFE#TRPBF | TSSOP-20 | FE | I | 05-08-1663 (CB) | Yes |
| LT8495IUF#PBF | 4x4 QFN-20 | UF | I | 05-08-1710 | Yes |
| LT8495IUF#TRPBF | 4x4 QFN-20 | UF | I | 05-08-1710 | Yes |
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 | |
|---|---|---|---|---|---|---|
| LT8495EFE#PBF | TSSOP-20 | E | $4.22 | $2.95 | Yes | |
| LT8495EFE#TRPBF | TSSOP-20 | E | $3.01 | Yes | ||
| LT8495EUF#PBF | 4x4 QFN-20 | E | $4.22 | $2.95 | Yes | |
| LT8495EUF#TRPBF | 4x4 QFN-20 | E | $3.01 | Yes | ||
| LT8495HFE#PBF | TSSOP-20 | H | $5.00 | $3.50 | Yes | |
| LT8495HFE#TRPBF | TSSOP-20 | H | $3.56 | Yes | ||
| LT8495IFE#PBF | TSSOP-20 | I | $4.64 | $3.25 | Yes | |
| LT8495IFE#TRPBF | TSSOP-20 | I | $3.31 | Yes | ||
| LT8495IUF#PBF | 4x4 QFN-20 | I | $4.64 | $3.25 | Yes | |
| LT8495IUF#TRPBF | 4x4 QFN-20 | I | $3.31 | Yes | ||
| Buy Now • Request Samples | ||||||
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 |
|---|---|---|---|
| DC2205A | LT8495 Demo Board | SEPIC, 3V ≤ VIN ≤ 60V, Vout = 5V @ 1A | $230.00 | |
| Buy Now | |||
Applications
- Automotive ECU Power
- Power for Portable Products
- Industrial Supplies
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Design Tools
LTspice
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LT8495
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
