LT1941 - Triple Monolithic Switching Regulator


  • Wide Input Range: 3.5V to 25V
  • Three Switching Regulators with Internal Power Switches: 3A Step-Down, 2A Step-Down, 1.5A Inverting/Boost
  • Antiphase Switching Reduces Ripple
  • Independent Shutdown/Soft-Start Pins
  • Independent Power Good Indicators Ease Supply Sequencing
  • Input Voltage Power Good Indicators Monitor Input Supply
  • Uses Small Inductors and Ceramic Capacitors
  • Constant 1.1MHz Switching Frequency
  • Thermally Enhanced 28-Lead TSSOP Package

Typical Application

LT1941 Typical Application
LT1941 Typical Application


The LT1941 is a triple current mode DC/DC converter with internal power switches. Two of the regulators are step-down converters with 3A and 2A power switches. The third regulator can be configured as a boost, inverter or SEPIC converter and has a 1.5A power switch. All three converters are synchronized to a 1.1MHz oscillator. The two step-down converters run with opposite phase, reducing input ripple current. The output voltages are set with external resistor dividers and each regulator has independent shutdown and soft-start circuits. Each regulator generates a power good signal when its output is in regulation, easing power supply sequencing and interfacing with microcontrollers and DSPs.

The high switching frequency offers several advantages by permitting the use of small inductors and ceramic capacitors, leading to a very small triple output solution. The constant switching frequency, combined with low impedance ceramic capacitors, result in low, predictable output ripple. With its wide input voltage range of 3.5V to 25V, the LT1941 regulates a broad array of power sources from 4-cell batteries and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed-power supplies.


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
LT1941EFE#PBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT1941EFE#TRPBF TSSOP-28 FE E 05-08-1663 (EB) Yes

LT1941 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
LT1941EFE#PBF TSSOP-28 E $7.50 $5.25 Yes
LT1941EFE#TRPBF TSSOP-28 E $5.37 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
DC621A LT1941EFE Demo Board | 4.7V ≤ VIN ≤ 14V, Vout1 = 1.8V @ 2.4A, Vout2 = 3.3V @ 1.4A, Vout3 = -12V @ Up to 550mA $150.00
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Click here to view our complete list of demo boards


  • Cable Modems
  • DSL Modems
  • Distributed Power Regulation
  • Wall Transformer Regulation
  • Disk Drives
  • DSP Power

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Design Tools


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:

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