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LT1373 - 250kHz Low Supply Current High Efficiency 1.5A Switching Regulator

Features

  • 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

Typical Application

LT1373 Typical Application
LT1373 Typical Application

Description

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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
Drawing		 RoHS
LT1373CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1373CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1373CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1373HVCN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1373HVCS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1373HVCS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1373HVIN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT1373HVIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1373HVIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1373IN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT1373IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1373IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LT1373 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LT1373CN8#PBF N-8 C $4.30 $3.50 Yes
LT1373CS8#PBF SO-8 C $4.50 $3.65 Yes
LT1373CS8#TRPBF SO-8 C $3.71 Yes
LT1373HVCN8#PBF N-8 C $4.75 $3.80 Yes
LT1373HVCS8#PBF SO-8 C $4.90 $3.95 Yes
LT1373HVCS8#TRPBF SO-8 C $4.01 Yes
LT1373HVIN8#PBF N-8 I $5.65 $4.55 Yes
LT1373HVIS8#PBF SO-8 I $5.80 $4.65 Yes
LT1373HVIS8#TRPBF SO-8 I $4.71 Yes
LT1373IN8#PBF N-8 I $5.25 $4.20 Yes
LT1373IS8#PBF SO-8 I $5.40 $4.35 Yes
LT1373IS8#TRPBF SO-8 I $4.41 Yes
Buy Now • Request Samples
* 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
DC076A LT1373CS8 | BOOST, 5V TO 12V, 0.3A, 250kHz Contact Factory
DC161A LT1373HV | SLIC POWER SUPPLY, -20Vout @ 60mA and -60Vout @ 35mA+ Contact Factory
DC181A LT1373CS8 | DUAL OUTPUT BUCK/BOOST SEPIC REGULATOR, 2.7 to 24Vin, -5V and +5V @ up to 0.3A OUTPUT Contact Factory
DC515A LT1373CS8 | Power Supply, CCFL, Single Lamp, Vin=5V to 20V $150.00
Buy Now
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

LTspice

LTspice® software 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

Models for the following parts are available in LTspice:
LT1373
LT1373HV

Technical Support