LT1376 - 1.5A, 500kHz Step-Down Switching Regulators

Features

  • Constant 500kHz Switching Frequency
  • Uses All Surface Mount Components
  • Inductor Size Reduced to 5μH
  • Easily Synchronizable
  • Saturating Switch Design: 0.4Ω
  • Effective Supply Current: 2.5mA
  • Shutdown Current: 20μA
  • Cycle-by-Cycle Current Limiting

Typical Application

LT1376 Typical Application
LT1376 Typical Application

Description

The LT1375/LT1376 are 500kHz monolithic buck mode switching regulators. A 1.5A 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. A shutdown signal will reduce supply current to 20μA on both parts. The LT1375 can be externally synchronized from 580kHz to 900kHz with logic level inputs.

The LT1375/LT1376 fit into standard 8-pin PDIP and SO packages, as well as a fused lead 16-pin SO with much lower thermal resistance. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are used, including the inductor and capacitors.

For low input voltage applications with 3.3V output, see LT1507. This is a functionally identical part that can operate with input voltages between 4.5V and 12V.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

SO-8, N-8, SO-16

LT1376 Package Drawing
LT1376 Package Drawing
LT1376 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1376CN8 PDIP 8 C $4.35 $3.50 View
LT1376CN8#PBF PDIP 8 C $4.35 $3.50 View
LT1376CN8-5 PDIP 8 C $4.35 $3.50 View
LT1376CN8-5#PBF PDIP 8 C $4.35 $3.50 View
LT1376CS SO 16 C $4.35 $3.65 View
LT1376CS#PBF SO 16 C $4.35 $3.65 View
LT1376CS#TR SO 16 C $3.71 View
LT1376CS#TRPBF SO 16 C $3.71 View
LT1376CS8 SO 8 C $3.80 $3.20 View
LT1376CS8#PBF SO 8 C $3.80 $3.20 View
LT1376CS8#TR SO 8 C $3.26 View
LT1376CS8#TRPBF SO 8 C $3.26 View
LT1376CS8-5 SO 8 C $4.30 $3.60 View
LT1376CS8-5#PBF SO 8 C $4.30 $3.60 View
LT1376CS8-5#TR SO 8 C $3.66 View
LT1376CS8-5#TRPBF SO 8 C $3.66 View
LT1376HVCS SO 16 C $4.80 $4.00 View
LT1376HVCS#PBF SO 16 C $4.80 $4.00 View
LT1376HVCS#TR SO 16 C $4.06 View
LT1376HVCS#TRPBF SO 16 C $4.06 View
LT1376HVCS8 SO 8 C $4.20 $3.50 View
LT1376HVCS8#PBF SO 8 C $4.20 $3.50 View
LT1376HVCS8#TR SO 8 C $3.56 View
LT1376HVCS8#TRPBF SO 8 C $3.56 View
LT1376HVIS SO 16 I $5.60 $4.65 View
LT1376HVIS#PBF SO 16 I $5.60 $4.65 View
LT1376HVIS#TR SO 16 I $4.71 View
LT1376HVIS#TRPBF SO 16 I $4.71 View
LT1376HVIS8 SO 8 I $5.05 $4.24 View
LT1376HVIS8#PBF SO 8 I $5.05 $4.24 View
LT1376HVIS8#TR SO 8 I $4.30 View
LT1376HVIS8#TRPBF SO 8 I $4.30 View
LT1376IN8 PDIP 8 I $5.25 $4.20 View
LT1376IN8#PBF PDIP 8 I $5.25 $4.20 View
LT1376IN8-5 PDIP 8 I $5.25 $4.20 View
LT1376IN8-5#PBF PDIP 8 I $5.25 $4.20 View
LT1376IS SO 16 I $5.05 $4.25 View
LT1376IS#PBF SO 16 I $5.05 $4.25 View
LT1376IS#TR SO 16 I $4.31 View
LT1376IS#TRPBF SO 16 I $4.31 View
LT1376IS8 SO 8 I $4.55 $3.85 View
LT1376IS8#PBF SO 8 I $4.55 $3.85 View
LT1376IS8#TR SO 8 I $3.91 View
LT1376IS8#TRPBF SO 8 I $3.91 View
LT1376IS8-5 SO 8 I $5.40 $4.35 View
LT1376IS8-5#PBF SO 8 I $5.40 $4.35 View
LT1376IS8-5#TR SO 8 I $4.41 View
LT1376IS8-5#TRPBF SO 8 I $4.41 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology 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.

Click here to view our complete list of demo boards

Applications

  • Portable Computers
  • Battery-Powered Systems
  • Battery Charger
  • Distributed Power

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Design Tools

LTspiceIV

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
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To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LT1376
LT1376-5
LT1376HV

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