LT1374: 4.5A, 500kHz Step-Down Switching Regulator Data Sheet8/31/2007703K
Features and Benefits
- 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
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.
- Portable Computers
- Battery-Powered Systems
- Battery Chargers
- Distributed Power
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (5)
DC474A: Demo Board for LT1374 4.5A, 500kHz Step-Down Switching Regulator.
DC187A-A: Demo Board for the LT1374 4.5A, 500kHz Step-Down Switching Regulator.
DC187A-B: Demo Board for the LT1374 4.5A, 500kHz Step-Down Switching Regulator.
Documentation & Resources
R388 Reliability Data3/26/201832 K
AN84 - Linear Technology Magazine Circuit Collection, Volume IV8/20/20072M
DC474A - Demo Manual9/24/2009132K
DC187A - Demo Manual9/24/2009342K
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Reference Designs (1)
Altera 100G Development Kit, Stratix V Edition
Altera 100G Development Kit, Stratix V Edition
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