LT1374 - 4.5A, 500kHz Step-Down Switching Regulator
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
Features
Typical Application  | Applications
Packaging    |
Order Information
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LT1374CFE#PBF | TSSOP-16 | C | $5.38 | $4.55 |
| LT1374CFE#TRPBF | TSSOP-16 | C | $4.67 | |
| LT1374CR-5#PBF | DDPAK-7 | C | $5.50 | $4.70 |
| LT1374CR-5#TRPBF | DDPAK-7 | C | $4.82 | |
| LT1374CR-5SYNC#PBF | DDPAK-7 | C | $5.50 | $4.70 |
| LT1374CR-5Sync#TRPBF | DDPAK-7 | C | $4.82 | |
| LT1374CR-SYNC#PBF | DDPAK-7 | C | $5.50 | $4.70 |
| LT1374CR-Sync#TRPBF | DDPAK-7 | C | $4.82 | |
| LT1374CR#PBF | DDPAK-7 | C | $5.50 | $4.70 |
| LT1374CR#TRPBF | DDPAK-7 | C | $4.82 | |
| LT1374CS8-5#PBF | SO-8 | C | $5.00 | $4.40 |
| LT1374CS8-5#TRPBF | SO-8 | C | $4.46 | |
| LT1374CS8-5SYNC#PBF | SO-8 | C | $5.00 | $4.40 |
| LT1374CS8-5Sync#TRPBF | SO-8 | C | $4.46 | |
| LT1374CS8-SYNC#PBF | SO-8 | C | $5.00 | $4.40 |
| LT1374CS8-Sync#TRPBF | SO-8 | C | $4.46 | |
| LT1374CS8#PBF | SO-8 | C | $5.00 | $4.40 |
| LT1374CS8#TRPBF | SO-8 | C | $4.46 | |
| LT1374CT7-5#PBF | TO-220 | C | $5.35 | $4.60 |
| LT1374CT7#PBF | TO-220 | C | $5.35 | $4.60 |
| LT1374HVCFE#PBF | TSSOP-16 | C | $5.92 | $5.00 |
| LT1374HVCFE#TRPBF | TSSOP-16 | C | $5.12 | |
| LT1374HVCR#PBF | DDPAK-7 | C | $6.15 | $5.10 |
| LT1374HVCR#TRPBF | DDPAK-7 | C | $5.22 | |
| LT1374HVCS8#PBF | SO-8 | C | $5.75 | $4.85 |
| LT1374HVCS8#TRPBF | SO-8 | C | $4.91 | |
| LT1374HVIFE#PBF | TSSOP-16 | I | $6.74 | $5.70 |
| LT1374HVIFE#TRPBF | TSSOP-16 | I | $5.82 | |
| LT1374HVIR#PBF | DDPAK-7 | I | $7.00 | $5.90 |
| LT1374HVIR#TRPBF | DDPAK-7 | I | $6.02 | |
| LT1374HVIS8#PBF | SO-8 | I | $6.60 | $5.55 |
| LT1374HVIS8#TRPBF | SO-8 | I | $5.61 | |
| LT1374IFE#PBF | TSSOP-16 | I | $6.15 | $5.20 |
| LT1374IFE#TRPBF | TSSOP-16 | I | $5.32 | |
| LT1374IR-5#PBF | DDPAK-7 | I | $6.30 | $5.40 |
| LT1374IR-5#TRPBF | DDPAK-7 | I | $5.52 | |
| LT1374IR-5SYNC#PBF | DDPAK-7 | I | $6.30 | $5.40 |
| LT1374IR-SYNC#PBF | DDPAK-7 | I | $6.30 | $5.40 |
| LT1374IR#PBF | DDPAK-7 | I | $6.30 | $5.40 |
| LT1374IR#TRPBF | DDPAK-7 | I | $5.52 | |
| LT1374IS8-5#PBF | SO-8 | I | $5.75 | $5.05 |
| LT1374IS8-5#TRPBF | SO-8 | I | $5.11 | |
| LT1374IS8-5SYNC#PBF | SO-8 | I | $5.75 | $5.05 |
| LT1374IS8-SYNC#PBF | SO-8 | I | $5.75 | $5.05 |
| LT1374IS8#PBF | SO-8 | I | $5.75 | $5.05 |
| LT1374IS8#TRPBF | SO-8 | I | $5.11 | |
| LT1374IT7-5#PBF | TO-220 | I | $6.15 | $5.30 |
| LT1374IT7#PBF | TO-220 | I | $6.15 | $5.30 |
Demo Boards
| Part Number | Description | Price |
|---|---|---|
| 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 |
- LT1374 Package Drawing LT1374
- LT1374 Package Drawing LT1374
- LT1374 Package Drawing LT1374
- AN84 - Linear Technology Magazine Circuit Collection, Volume IV
- DN181 - A High Efficiency 500kHz, 4.5A Step-Down Converter in an SO-8 Package
- R388 Reliability Data
- LT1374 Footprints and Symbols
- LT1374HV Demo Circuit - 4.5A, 500kHz Step-Down Switching Regulator (12V to 5V @ 3.75A)
