LT1616 - 600mA, 1.4MHz Step-Down Switching Regulator in SOT-23


  • Wide Input Range: 3.6V to 25V
  • 5V at 400mA from7V to 25V Input
  • 3.3V at 400mA from 4.7V to 25V Input
  • Fixed Frequency 1.4MHz Operation
  • Uses Tiny Capacitors and Inductors
  • Internally Compensated
  • Low Shutdown Current: <1µA
  • Low VCESAT Switch: 220mV at 300mA
  • Tiny 6-Lead SOT-23 Package

Typical Application

LT1616 Typical Application
LT1616 Typical Application


The LT1616 is a current mode PWM step-down DC/DC converter with internal 0.6A power switch, packaged in a tiny 6-lead SOT-23. The wide input range of 3.6V to 25V makes the LT1616 suitable for regulating a wide variety of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers and lead-acid batteries. Its high operating frequency allow the use of tiny, low cost inductors and ceramic capacitors. With its internal compensation eliminating additional components, a complete 400mA step-down regulator fits onto 0.15 square inches of PC board area.

The constant frequency current mode PWM architecture and stable operation with ceramic capacitors results in lopw, predictable output ripple. Current limiting provides protection against shorted outputs. The low current (<1µA) shutdown provides complete output disconnect, enabling easy power management in battery-powered systems.


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
LT1616ES6#PBF SOT-23 S6 E 05-08-1636 Yes
LT1616ES6#TRMPBF SOT-23 S6 E 05-08-1636 Yes
LT1616ES6#TRPBF SOT-23 S6 E 05-08-1636 Yes

LT1616 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
LT1616ES6#PBF SOT-23 E $2.40 Yes
LT1616ES6#TRMPBF SOT-23 E $2.40 $2.03 Yes
LT1616ES6#TRPBF SOT-23 E $2.40 $2.01 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.

Click here to view our complete list of demo boards


  • Wall Transformer Regulation
  • Local Logic Supply Conversion:
    12V to 5V
    12V or 5V to 3.3V, 2.5V or 1.8V
  • Battery-Powered Equipement
  • Distributed Supply Regulation
  • Digital Cameras

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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

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