LT1912 - 36V, 2A, 500kHz Step-Down Switching Regulator

Features

  • Wide Input Range: Operation From 3.6V to 36V
  • 2A Maximum Output Current
  • Adjustable Switching Frequency: 200kHz to 500kHz
  • Low Shutdown Current: IQ < 1μA
  • Integrated Boost Diode
  • Synchronizable Between 250kHz to 500kHz
  • Saturating Switch Design: 0.25Ω On-Resistance
  • 0.790V Feedback Reference Voltage
  • Output Voltage: 0.79V to 20V
  • Soft-Start Capability
  • Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages

Typical Application

LT1912 Typical Application
LT1912 Typical Application

Description

The LT1912 is an adjustable frequency (200kHz to 500kHz) monolithic step-down switching regulator that accepts input voltages up to 36V. A high efficiency 0.25Ω switch is included on the die along with a boost Schottky diode and the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability. The LT1912 allows the use of ceramic capacitors resulting in low output ripple while keeping total solution size to a minimum. The low current shutdown mode reduces input supply current to less than 1μA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). The LT1912 is available in 10-pin MSOP and 3mm × 3mm DFN packages with exposed pads for low thermal resistance.

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
LT1912EDD#PBF 3x3 DFN-10 DD E 05-08-1699 Yes
LT1912EDD#TRPBF 3x3 DFN-10 DD E 05-08-1699 Yes
LT1912EMSE#PBF MS-10E MSE E 05-08-1664 Yes
LT1912EMSE#TRPBF MS-10E MSE E 05-08-1664 Yes


LT1912 Package Drawing
LT1912 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
LT1912EDD#PBF 3x3 DFN-10 E $4.21 $2.95 Yes
LT1912EDD#TRPBF 3x3 DFN-10 E $3.01 Yes
LT1912EMSE#PBF MS-10E E $4.36 $3.05 Yes
LT1912EMSE#TRPBF MS-10E E $3.11 Yes
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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
DC1313A LT1912EDD | 36V, 2A, 500kHz Step-Down Switching Regulator $125.00
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Click here to view our complete list of demo boards

Applications

  • Automotive Battery Regulation
  • Set-Top Box
  • Distributed Supply Regulation
  • Industrial Supplies
  • Wall Transformer Regulation

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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

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
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice 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:
LT1912

LTpowerCAD

The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LT1912

Technical Support