LT1372 - 500kHz and 1MHz High Efficiency 1.5A Switching Regulators

Features

  • Faster Switching with Increased Efficiency
  • Uses Small Inductors: 4.7µH
  • All Surface Mount Components
  • Only 0.5 Square Inch of Board Space
  • Low Minimum Supply Voltage: 2.7V
  • Quiescent Current: 4mA Typ
  • Current Limited Power Switch: 1.5A
  • Regulates Positive or Negative Outputs
  • Shutdown Supply Current: 12µA Typ
  • Easy External Synchronization
  • 8-Pin SO or PDIP Packages

Typical Application

LT1372 Typical Application
LT1372 Typical Application

Description

The LT1372/LT1377 are monolithic high frequency switching regulators. They can be operated in all standard switching configurations including boost, buck, flyback, forward, inverting and "Cuk." A 1.5A high efficiency switch is included on the die, along with all oscillator, control and protection circuitry. All functions of the LT1372/LT1377 are integrated into 8-pin SO/PDIP packages.

The LT1372/LT1377 typically consumes only 4mA quiescent current and has higher efficiency than previous parts. High frequency switching allows for very small inductors to be used. All surface mount components consume less than 0.5 square inch of board space.

New design techniques increase flexibility and maintain ease of use. Switching is easily synchronized to an external logic level source. A logic low on the shutdown pin reduces supply current to 12µA. Unique error amplifier circuitry can regulate positive or negative output voltage while maintaining simple frequency compensation techniques. Nonlinear error amplifier transconductance reduces output overshoot on start-up or overload recovery. Oscillator frequency shifting protects external components during overload conditions.

Packaging

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

SO-8,TSSOP-16

LT1372 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT1372CN8 PDIP 8 C $4.30 $3.50 View
LT1372CN8#PBF PDIP 8 C $4.30 $3.50 View
LT1372CS8 SO 8 C $4.50 $3.65 View
LT1372CS8#PBF SO 8 C $4.50 $3.65 View
LT1372CS8#TR SO 8 C $3.71 View
LT1372CS8#TRPBF SO 8 C $3.71 View
LT1372HVCN8 PDIP 8 C $4.75 $3.80 View
LT1372HVCN8#PBF PDIP 8 C $4.75 $3.80 View
LT1372HVCS8 SO 8 C $4.90 $3.95 View
LT1372HVCS8#PBF SO 8 C $4.90 $3.95 View
LT1372HVIN8 PDIP 8 I $5.65 $4.55 View
LT1372HVIN8#PBF PDIP 8 I $5.65 $4.55 View
LT1372HVIS8 SO 8 I $5.80 $4.65 View
LT1372HVIS8#PBF SO 8 I $5.80 $4.65 View
LT1372HVIS8#TR SO 8 I $4.71 View
LT1372HVIS8#TRPBF SO 8 I $4.71 View
LT1372IN8 PDIP 8 I $5.25 $4.20 View
LT1372IN8#PBF PDIP 8 I $5.25 $4.20 View
LT1372IS8 SO 8 I $5.40 $4.35 View
LT1372IS8#PBF SO 8 I $5.40 $4.35 View
LT1372IS8#TR SO 8 I $4.41 View
LT1372IS8#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.

Part Number Description Price Documentation
DC053A-A LT1372CS8 | 500kHz DC-DC Converter with Shutdown and Sync, 5-11Vin, 12Vout at 250mA. $100.00
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Click here to view our complete list of demo boards

Applications

  • Boost Regulators
  • CCFL Backlight Driver
  • Laptop Computer Supplies
  • Multiple Output Flyback Supplies
  • Inverting Supplies

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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
  • Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As". After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

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:
LT1372
LT1372HV

Technical Support