LT1373
PRODUCTION250kHz Low Supply Current High Efficiency 1.5A Switching Regulator
- Part Models
- 12
- 1ku List Price
- Starting From $5.46
Overview
- 1mA IQ at 250kHz
- Uses Small Inductors: 15µH
- All Surface Mount Components
- Only 0.6 Square Inch of Board Space
- Low Minimum Supply Voltage: 2.7V
- Constant Frequency Current Mode
- 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 LT1373 is a low supply current high frequency current mode switching regulator. It 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 LT1373 are integrated into 8-pin SO/PDIP packages.
Compared to the 500kHz LT1372, which draws 4mA of quiescent current, the LT1373 switches at 250kHz, typically consumes only 1mA and has higher efficiency. High frequency switching allows for small inductors to be used. All surface mount components consume less than 0.6 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.
Applications
- Boost Regulators
- CCFL Backlight Driver
- Laptop Computer Supplies
- Multiple Output Flyback Supplies
- Inverting Supplies
Documentation
Data Sheet 1
User Guide 1
Design Note 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT1373CN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1373CS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1373CS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1373HVCN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1373HVCS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1373HVCS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1373HVIN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1373HVIS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1373HVIS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1373IN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1373IS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1373IS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 8, 2024 - 24_0234 Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package |
||
| LT1373CN8#PBF | PRODUCTION | |
| LT1373HVCN8#PBF | PRODUCTION | |
| LT1373HVIN8#PBF | PRODUCTION | |
| LT1373IN8#PBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package |
||
| LT1373CN8#PBF | PRODUCTION | |
| LT1373HVCN8#PBF | PRODUCTION | |
| LT1373HVIN8#PBF | PRODUCTION | |
| LT1373IN8#PBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG] |
||
| LT1373CN8#PBF | PRODUCTION | |
| LT1373HVCN8#PBF | PRODUCTION | |
| LT1373HVIN8#PBF | PRODUCTION | |
| LT1373IN8#PBF | PRODUCTION | |
|
Dec 14, 2023 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LT1373CS8#PBF | PRODUCTION | |
| LT1373CS8#TRPBF | PRODUCTION | |
| LT1373HVCS8#PBF | PRODUCTION | |
| LT1373HVCS8#TRPBF | PRODUCTION | |
| LT1373HVIS8#PBF | PRODUCTION | |
| LT1373HVIS8#TRPBF | PRODUCTION | |
| LT1373IS8#PBF | PRODUCTION | |
| LT1373IS8#TRPBF | PRODUCTION | |
|
Jun 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LT1373CS8#PBF | PRODUCTION | |
| LT1373CS8#TRPBF | PRODUCTION | |
| LT1373HVCS8#PBF | PRODUCTION | |
| LT1373HVCS8#TRPBF | PRODUCTION | |
| LT1373HVIS8#PBF | PRODUCTION | |
| LT1373HVIS8#TRPBF | PRODUCTION | |
| LT1373IS8#PBF | PRODUCTION | |
| LT1373IS8#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT1373
- LT1373HV
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.
Evaluation Kits
LT1373HV | SLIC Power Supply, –20VOUT @ 60mA and –60VOUT @ 35mA Plus
Resources
LT1373CS8 | Boost, 5V to 12V, 0.3A, 250kHz
Resources
LT1373CS8 | Dual Output Buck/Boost SEPIC Regulator, 2.7 to 24VIN, -5V and +5V @ up to 0.3A Output
Resources
LT1373CS8 | Power Supply, CCFL, Single Lamp, VIN = 5V to 20V
Resources
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