Features and Benefits
- 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
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.
- Boost Regulators
- CCFL Backlight Driver
- Laptop Computer Supplies
- Multiple Output Flyback Supplies
- Inverting Supplies
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 (1)
Documentation & Resources
R388 Reliability Data3/26/201832 K
AN65 - A Fourth Generation of LCD Backlight Technology2/5/20135M
DC053A - Demo Board1/12/2010176K
LT1372/LT1377 Specification Notice11/22/2004101K
DN125 - Monolithic DC/DC Converters Break Speed Limits to Shrink Board Space3/21/201477K
DN95 - Capacitor and EMI Considerations New High Frequency Switching Regulators3/21/201480K
DN110 - Micropower Buck/Boost Circuits, Part 2: Converting Four Cells to 5V*8/21/2007129K
Design Note 183: The LT1370: A 500kHz, 6A Monolithic Boost Converter7/1/1998
Design Note 109: Micropower Buck/Boost Circuits, Part 1: Converting Three Cells to 3.3V*1/1/1995
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
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Step 3: If LTspice does not automatically open after clicking the link below, 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.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.