LT1374 4.5A, 500kHz Step-Down Switching Regulator
The LT®1374 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
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LT1374 订购信息和价格参考Package Variations and Pricing
| 器件型号 | 封装 | 引脚 | 温度 | 价格 (以 1 ~ 99 片为批量) | 价格 (以 1000 片为批量) * |
| LT1374CFE | TSSOP | 16 | C | $5.38 | $4.55 |
| LT1374CFE#PBF | TSSOP | 16 | C | $5.38 | $4.55 |
| LT1374CFE#TR | TSSOP | 16 | C | $4.67 | |
| LT1374CFE#TRPBF | TSSOP | 16 | C | $4.67 | |
| LT1374CR | DD PAK | 7 | C | $5.50 | $4.70 |
| LT1374CR#PBF | DD PAK | 7 | C | $5.50 | $4.70 |
| LT1374CR#TR | DD PAK | 7 | C | $4.82 | |
| LT1374CR#TRPBF | DD PAK | 7 | C | $4.82 | |
| LT1374CR-5 | DD PAK | 7 | C | $5.50 | $4.70 |
| LT1374CR-5#PBF | DD PAK | 7 | C | $5.50 | $4.70 |
| LT1374CR-5#TR | DD PAK | 7 | C | $4.82 | |
| LT1374CR-5#TRPBF | DD PAK | 7 | C | $4.82 | |
| LT1374CR-5SYNC | DD PAK | 7 | C | $5.50 | $4.70 |
| LT1374CR-5SYNC#PBF | DD PAK | 7 | C | $5.50 | $4.70 |
| LT1374CR-5Sync#TR | DD PAK | 7 | C | $4.82 | |
| LT1374CR-5Sync#TRPBF | DD PAK | 7 | C | $4.82 | |
| LT1374CR-SYNC | DD PAK | 7 | C | $5.50 | $4.70 |
| LT1374CR-SYNC#PBF | DD PAK | 7 | C | $5.50 | $4.70 |
| LT1374CR-Sync#TR | DD PAK | 7 | C | $4.82 | |
| LT1374CR-Sync#TRPBF | DD PAK | 7 | C | $4.82 | |
| LT1374CS8 | SO | 8 | C | $5.00 | $4.40 |
| LT1374CS8#PBF | SO | 8 | C | $5.00 | $4.40 |
| LT1374CS8#TR | SO | 8 | C | $4.46 | |
| LT1374CS8#TRPBF | SO | 8 | C | $4.46 | |
| LT1374CS8-5 | SO | 8 | C | $5.00 | $4.40 |
| LT1374CS8-5#PBF | SO | 8 | C | $5.00 | $4.40 |
| LT1374CS8-5#TR | SO | 8 | C | $4.46 | |
| LT1374CS8-5#TRPBF | SO | 8 | C | $4.46 | |
| LT1374CS8-5SYNC | SO | 8 | C | $5.00 | $4.40 |
| LT1374CS8-5SYNC#PBF | SO | 8 | C | $5.00 | $4.40 |
| LT1374CS8-5Sync#TR | SO | 8 | C | $4.46 | |
| LT1374CS8-5Sync#TRPBF | SO | 8 | C | $4.46 | |
| LT1374CS8-SYNC | SO | 8 | C | $5.00 | $4.40 |
| LT1374CS8-SYNC#PBF | SO | 8 | C | $5.00 | $4.40 |
| LT1374CS8-Sync#TR | SO | 8 | C | $4.46 | |
| LT1374CS8-Sync#TRPBF | SO | 8 | C | $4.46 | |
| LT1374CT7 | TO-220 | 7 | C | $5.35 | $4.60 |
| LT1374CT7#PBF | TO-220 | 7 | C | $5.35 | $4.60 |
| LT1374CT7-5 | TO-220 | 7 | C | $5.35 | $4.60 |
| LT1374CT7-5#PBF | TO-220 | 7 | C | $5.35 | $4.60 |
| LT1374HVCFE | TSSOP | 16 | C | $5.92 | $5.00 |
| LT1374HVCFE#PBF | TSSOP | 16 | C | $5.92 | $5.00 |
| LT1374HVCFE#TR | TSSOP | 16 | C | $5.12 | |
| LT1374HVCFE#TRPBF | TSSOP | 16 | C | $5.12 | |
| LT1374HVCR | DD PAK | 7 | C | $6.15 | $5.10 |
| LT1374HVCR#PBF | DD PAK | 7 | C | $6.15 | $5.10 |
| LT1374HVCR#TR | DD PAK | 7 | C | $5.22 | |
| LT1374HVCR#TRPBF | DD PAK | 7 | C | $5.22 | |
| LT1374HVCS8 | SO | 7 | C | $5.75 | $4.85 |
| LT1374HVCS8#PBF | SO | 7 | C | $5.75 | $4.85 |
| LT1374HVCS8#TR | SO | 8 | C | $4.91 | |
| LT1374HVCS8#TRPBF | SO | 8 | C | $4.91 | |
| LT1374HVIFE | TSSOP | 16 | I | $6.74 | $5.70 |
| LT1374HVIFE#PBF | TSSOP | 16 | I | $6.74 | $5.70 |
| LT1374HVIFE#TR | TSSOP | 16 | I | $5.82 | |
| LT1374HVIFE#TRPBF | TSSOP | 16 | I | $5.82 | |
| LT1374HVIR | DD PAK | 7 | I | $7.00 | $5.90 |
| LT1374HVIR#PBF | DD PAK | 7 | I | $7.00 | $5.90 |
| LT1374HVIR#TR | DD PAK | 7 | I | $6.02 | |
| LT1374HVIR#TRPBF | DD PAK | 7 | I | $6.02 | |
| LT1374HVIS8 | SO | 8 | I | $6.60 | $5.55 |
| LT1374HVIS8#PBF | SO | 8 | I | $6.60 | $5.55 |
| LT1374HVIS8#TR | SO | 8 | I | $5.61 | |
| LT1374HVIS8#TRPBF | SO | 8 | I | $5.61 | |
| LT1374IFE | TSSOP | 16 | I | $6.15 | $5.20 |
| LT1374IFE#PBF | TSSOP | 16 | I | $6.15 | $5.20 |
| LT1374IFE#TR | TSSOP | 16 | I | $5.32 | |
| LT1374IFE#TRPBF | TSSOP | 16 | I | $5.32 | |
| LT1374IR | DD PAK | 7 | I | $6.30 | $5.40 |
| LT1374IR#PBF | DD PAK | 7 | I | $6.30 | $5.40 |
| LT1374IR#TRPBF | DD PAK | 7 | I | $5.52 | |
| LT1374IR-5 | DD PAK | 7 | I | $6.30 | $5.40 |
| LT1374IR-5#PBF | DD PAK | 7 | I | $6.30 | $5.40 |
| LT1374IR-5#TRPBF | DD PAK | 7 | I | $5.52 | |
| LT1374IR-5SYNC | DD PAK | 7 | I | $6.30 | $5.40 |
| LT1374IR-5SYNC#PBF | DD PAK | 7 | I | $6.30 | $5.40 |
| LT1374IR-SYNC | DD PAK | 7 | I | $6.30 | $5.40 |
| LT1374IR-SYNC#PBF | DD PAK | 7 | I | $6.30 | $5.40 |
| LT1374IS8 | SO | 8 | I | $5.75 | $5.05 |
| LT1374IS8#PBF | SO | 8 | I | $5.75 | $5.05 |
| LT1374IS8#TR | SO | 8 | I | $5.11 | |
| LT1374IS8#TRPBF | SO | 8 | I | $5.11 | |
| LT1374IS8-5 | SO | 8 | I | $5.75 | $5.05 |
| LT1374IS8-5#PBF | SO | 8 | I | $5.75 | $5.05 |
| LT1374IS8-5#TR | SO | 8 | I | $5.11 | |
| LT1374IS8-5#TRPBF | SO | 8 | I | $5.11 | |
| LT1374IS8-5SYNC | SO | 8 | I | $5.75 | $5.05 |
| LT1374IS8-5SYNC#PBF | SO | 8 | I | $5.75 | $5.05 |
| LT1374IS8-SYNC | SO | 8 | I | $5.75 | $5.05 |
| LT1374IS8-SYNC#PBF | SO | 8 | I | $5.75 | $5.05 |
| LT1374IT7 | TO-220 | 7 | I | $6.15 | $5.30 |
| LT1374IT7#PBF | TO-220 | 7 | I | $6.15 | $5.30 |
| LT1374IT7-5 | TO-220 | 7 | I | $6.15 | $5.30 |
| LT1374IT7-5#PBF | TO-220 | 7 | I | $6.15 | $5.30 |
LT1374 数据手册及相关资料下载
- 数据手册(英文) : LT1374 - 4.5A, 500kHz Step-Down Switching Regulator.PDF
- 设计要点 (英文) : DN181 - A High Efficiency 500kHz, 4.5A Step-Down Converter in an SO-8 Package.PDF
- 设计要点 (英文) : DN84 - Source Resistance Induced Distortion in Op Amps.PDF
- 可靠性数据 : R388 Reliability Data .PDF
