LT1933 - 600mA, 500kHz Step-Down Switching Regulator in SOT-23

Features

  • Wide Input Range: 3.6V to 36V
  • 5V at 600mA from 16V to 36V Input
  • 3.3V at 600mA from 12V to 36V Input
  • 5V at 500mA from 6.3V to 36V Input
  • 3.3V at 500mA from 4.5V to 36V Input
  • Fixed Frequency 500kHz Operation
  • Uses Tiny Capacitors and Inductors
  • Soft-Start
  • Internally Compensated
  • Low Shutdown Current: <2µA
  • Output Adjustable Down to 1.25V
  • Low Profile (1mm) SOT-23 (ThinSOT™) and (2mm x 3mm x 0.75mm) 6-Pin DFN Packages
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT1933 Typical Application
LT1933 Typical Application

Description

The LT1933 is a current mode PWM step-down DC/DC converter with an internal 0.75A power switch, packaged in a tiny 6-lead SOT-23. The wide input range of 3.6V to 36V makes the LT1933 suitable for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.

Cycle-by-cycle current limit provides protection against shorted outputs, and soft-start eliminates input current surge during start up. The low current (<2µA) shutdown provides output disconnect, enabling easy power management in battery-powered systems.

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
LT1933ES6#TRMPBF SOT-23 S6 E 05-08-1636 Yes
LT1933ES6#TRPBF SOT-23 S6 E 05-08-1636 Yes
LT1933HDCB#PBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LT1933HDCB#TRMPBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LT1933HDCB#TRPBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LT1933HS6#PBF SOT-23 S6 H 05-08-1636 Yes
LT1933HS6#TRMPBF SOT-23 S6 H 05-08-1636 Yes
LT1933HS6#TRPBF SOT-23 S6 H 05-08-1636 Yes
LT1933IDCB#PBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LT1933IDCB#TRMPBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LT1933IDCB#TRPBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LT1933IS6#PBF SOT-23 S6 I 05-08-1636 Yes
LT1933IS6#TRMPBF SOT-23 S6 I 05-08-1636 Yes
LT1933IS6#TRPBF SOT-23 S6 I 05-08-1636 Yes


LT1933 Package Drawing
LT1933 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
LT1933ES6#TRMPBF SOT-23 E $2.79 $2.00 Yes
LT1933ES6#TRPBF SOT-23 E $2.79 $1.95 Yes
LT1933HDCB#PBF 2x3 DFN-6 H $3.56 Yes
LT1933HDCB#TRMPBF 2x3 DFN-6 H $3.56 $2.54 Yes
LT1933HDCB#TRPBF 2x3 DFN-6 H $3.56 $2.49 Yes
LT1933HS6#PBF SOT-23 H $3.56 Yes
LT1933HS6#TRMPBF SOT-23 H $3.56 $2.54 Yes
LT1933HS6#TRPBF SOT-23 H $3.56 $2.49 Yes
LT1933IDCB#PBF 2x3 DFN-6 I $3.20 Yes
LT1933IDCB#TRMPBF 2x3 DFN-6 I $3.20 $2.29 Yes
LT1933IDCB#TRPBF 2x3 DFN-6 I $3.20 $2.24 Yes
LT1933IS6#PBF SOT-23 I $3.20 Yes
LT1933IS6#TRMPBF SOT-23 I $3.20 $2.29 Yes
LT1933IS6#TRPBF SOT-23 I $3.20 $2.24 Yes
Buy NowRequest 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
DC1092A LT1933HDCB Demo Board | (DFN) H-Grade Temp, 4.5V ≤ VIN ≤ 36V, Vout = 3.3V @ 500mA Contact Factory
DC662A LT1933ES6 Demo Board | (TSOT) 4.5V ≤ VIN ≤ 36V, Vout = 3.3V @ 500mA $150.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1933HDCB#PBF 2x3 DFN-6 H $3.56 Yes
LT1933HDCB#TRMPBF 2x3 DFN-6 H $3.56 $2.54 Yes
LT1933HDCB#TRPBF 2x3 DFN-6 H $3.56 $2.49 Yes
LT1933HS6#PBF SOT-23 H $3.56 Yes
LT1933HS6#TRMPBF SOT-23 H $3.56 $2.54 Yes
LT1933HS6#TRPBF SOT-23 H $3.56 $2.49 Yes
LT1933IDCB#PBF 2x3 DFN-6 I $3.20 Yes
LT1933IDCB#TRMPBF 2x3 DFN-6 I $3.20 $2.29 Yes
LT1933IDCB#TRPBF 2x3 DFN-6 I $3.20 $2.24 Yes
LT1933IS6#PBF SOT-23 I $3.20 Yes
LT1933IS6#TRMPBF SOT-23 I $3.20 $2.29 Yes
LT1933IS6#TRPBF SOT-23 I $3.20 $2.24 Yes
Buy NowRequest 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.

Applications

  • Automotive Battery Regulation
  • Industrial Control Supplies
  • Wall Transformer Regulation
  • Distributed Supply Regulation
  • Battery-Powered Equipment

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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:

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Models for the following parts are available in LTspice:
LT1933

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