LT1374 - 4.5A, 500kHz Step-Down Switching Regulator
Features
- Constant 500kHz Switching Frequency
- High Power 16-Pin TSSOP Package Available
- Uses All Surface Mount Components
- Inductor Size Reduced to 1.8µH
- Saturating Switch Design: 0.07Ω
- Effective Supply Current: 2.5mA
- Shutdown Current: 20µA
- Cycle-by-Cycle Current Limiting
- Easily Synchronizable
AEC-Q100 data available for specific packages
Typical Application
Description
The LT1374 is a 500kHz monolithic buck mode switching regulator. A 4.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. Both fixed output voltage and adjustable parts are available.
A special high speed bipolar process and new design techniques achieve high efficiency at high switching frequency. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch.
The LT1374 is available in standard 7-pin DD, TO-220, fused lead SO-8 and 16-pin exposed pad TSSOP packages. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts may be used, including the inductor and capacitors. There is the optional function of shutdown or synchronization. A shutdown signal reduces supply current to 20µA. Synchronization allows an external logic level signal to increase the internal oscillator from 580kHz to 1MHz.
Protected by U.S. Patents, Including 6111439, 5668493, 5656965
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 |
|---|---|---|---|---|---|
| LT1374CFE#PBF | TSSOP-16 | FE | C | 05-08-1663 (BB) | Yes |
| LT1374CFE#TRPBF | TSSOP-16 | FE | C | 05-08-1663 (BB) | Yes |
| LT1374CR-5#PBF | DDPAK-7 | R | C | 05-08-1462 | Yes |
| LT1374CR-5#TRPBF | DDPAK-7 | R | C | 05-08-1462 | Yes |
| LT1374CR-5SYNC#PBF | DDPAK-7 | R | C | 05-08-1462 | Yes |
| LT1374CR-5Sync#TRPBF | DDPAK-7 | R | C | 05-08-1462 | Yes |
| LT1374CR-SYNC#PBF | DDPAK-7 | R | C | 05-08-1462 | Yes |
| LT1374CR-Sync#TRPBF | DDPAK-7 | R | C | 05-08-1462 | Yes |
| LT1374CR#PBF | DDPAK-7 | R | C | 05-08-1462 | Yes |
| LT1374CR#TRPBF | DDPAK-7 | R | C | 05-08-1462 | Yes |
| LT1374CS8-5#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1374CS8-5#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1374CS8-5SYNC#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1374CS8-5Sync#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1374CS8-SYNC#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1374CS8-Sync#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1374CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1374CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1374CT7-5#PBF | TO-220 | T7 | C | 05-08-1422 (Standard) | Yes |
| LT1374CT7#PBF | TO-220 | T7 | C | 05-08-1422 (Standard) | Yes |
| LT1374HVCFE#PBF | TSSOP-16 | FE | C | 05-08-1663 (BB) | Yes |
| LT1374HVCFE#TRPBF | TSSOP-16 | FE | C | 05-08-1663 (BB) | Yes |
| LT1374HVCR#PBF | DDPAK-7 | R | C | 05-08-1462 | Yes |
| LT1374HVCR#TRPBF | DDPAK-7 | R | C | 05-08-1462 | Yes |
| LT1374HVCS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1374HVCS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1374HVIFE#PBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT1374HVIFE#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT1374HVIR#PBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT1374HVIR#TRPBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT1374HVIS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1374HVIS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1374IFE#PBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT1374IFE#TRPBF | TSSOP-16 | FE | I | 05-08-1663 (BB) | Yes |
| LT1374IR-5#PBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT1374IR-5#TRPBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT1374IR-5SYNC#PBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT1374IR-SYNC#PBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT1374IR#PBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT1374IR#TRPBF | DDPAK-7 | R | I | 05-08-1462 | Yes |
| LT1374IS8-5#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1374IS8-5#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1374IS8-5SYNC#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1374IS8-SYNC#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1374IS8#PBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1374IS8#TRPBF | SO-8 | S8 | I | 05-08-1610 (S8) | Yes |
| LT1374IT7-5#PBF | TO-220 | T7 | I | 05-08-1422 (Standard) | Yes |
| LT1374IT7#PBF | TO-220 | T7 | I | 05-08-1422 (Standard) | 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
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 |
|---|---|---|---|
| DC187A-A | LT1374CR | 4.5A SWITCH, 500kHz STEP-DOWN REGULATOR, 5.5V to 25Vin, 3.3V or 5.0V @ 4A OUTPUT, DD PACKAGE | $75.00 | |
| DC187A-B | LT1374CR-SYNC | 4.5A SWITCH, 500kHz STEP-DOWN REGULATOR, 5.5V to 25Vin, 3.3V or 5.0V @ 4A OUTPUT, DD PACKAGE | $75.00 | |
| DC188A-A | LT1374CS8 | 4.5A SWITCH, 500kHz STEP-DOWN REGULATOR, 5.5V to 25Vin, 3.3V or 5.0V @ 4A OUTPUT, SO8 PACKAGE | $75.00 | |
| DC188A-B | LT1374CS8-SYNC | 4.5A SWITCH, 500kHz STEP-DOWN REGULATOR, 5.5V to 25Vin, 3.3V or 5.0V @ 4A OUTPUT, SO8 PACKAGE | $75.00 | |
| DC474A | LT1374CFE | 4A, 500KHz Step Down Switching Regulator, 5-25Vin up to 4A, Jmpr Selectable 3.3 or 5Vout | $100.00 | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT1374HVIFE#PBF | TSSOP-16 | I | $6.74 | $5.70 | Yes | |
| LT1374HVIFE#TRPBF | TSSOP-16 | I | $5.82 | Yes | ||
| LT1374IFE#PBF | TSSOP-16 | I | $6.15 | $5.20 | Yes | |
| LT1374IFE#TRPBF | TSSOP-16 | I | $5.32 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Portable Computers
- Battery-Powered Systems
- Battery Chargers
- Distributed Power
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Design Tools
LTspice
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Models for the following parts are available in LTspice:
LT1374
LT1374-5
LT1374HV
LT1374HV-5
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.
