LT1766 - 5.5V to 60V 1.5A, 200kHz Step-Down Switching Regulator

Features

  • Wide Input Range: 5.5V to 60V
  • 1.5A Peak Switch Current
  • Constant 200kHz Switching Frequency
  • Saturating Switch Design: 0.2Ω
  • Peak Switch Current Rating Maintained Over Full Duty Cycle Range
  • Low Effective Supply Current: 2.5mA
  • Low Shutdown Current: 25μA
  • 1.2V Feedback Reference Voltage (LT1766)
  • 5V Fixed Output (LT1766-5)
  • Easily Synchronizable
  • Cycle-by-Cycle Current Limiting
  • Small 16-Pin SSOP and Thermally Enhanced TSSOP Packages
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LT1766 Typical Application
LT1766 Typical Application

Description

The LT1766/LT1766-5 are 200kHz monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 1.5A, 0.2Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode control architecture delivers fast transient response and excellent loop stability.

Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 25μA and the device can be externally synchronized from 228kHz to 700kHz with logic-level inputs.

The LT1766/LT1766-5 are available in a 16-pin fused-lead SSOP package or a TSSOP package with exposed backside for improved thermal performance.

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
LT1766EFE-5#PBF TSSOP-16 FE E 05-08-1663 (BB) Yes
LT1766EFE-5#TRPBF TSSOP-16 FE E 05-08-1663 (BB) Yes
LT1766EFE#PBF TSSOP-16 FE E 05-08-1663 (BB) Yes
LT1766EFE#TRPBF TSSOP-16 FE E 05-08-1663 (BB) Yes
LT1766EGN-5#PBF SSOP-16 GN E 05-08-1641 (GN16) Yes
LT1766EGN-5#TRPBF SSOP-16 GN E 05-08-1641 (GN16) Yes
LT1766EGN#PBF SSOP-16 GN E 05-08-1641 (GN16) Yes
LT1766EGN#TRPBF SSOP-16 GN E 05-08-1641 (GN16) Yes
LT1766HFE#PBF TSSOP-16 FE H 05-08-1663 (BB) Yes
LT1766HFE#TRPBF TSSOP-16 FE H 05-08-1663 (BB) Yes
LT1766IFE-5#PBF TSSOP-16 FE I 05-08-1663 (BB) Yes
LT1766IFE-5#TRPBF TSSOP-16 FE I 05-08-1663 (BB) Yes
LT1766IFE#PBF TSSOP-16 FE I 05-08-1663 (BB) Yes
LT1766IFE#TRPBF TSSOP-16 FE I 05-08-1663 (BB) Yes
LT1766IGN-5#PBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LT1766IGN-5#TRPBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LT1766IGN#PBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LT1766IGN#TRPBF SSOP-16 GN I 05-08-1641 (GN16) Yes


LT1766 Package Drawing
LT1766 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
LT1766EFE-5#PBF TSSOP-16 E $5.36 $3.75 Yes
LT1766EFE-5#TRPBF TSSOP-16 E $3.86 Yes
LT1766EFE#PBF TSSOP-16 E $5.36 $3.75 Yes
LT1766EFE#TRPBF TSSOP-16 E $3.86 Yes
LT1766EGN-5#PBF SSOP-16 E $4.32 $3.65 Yes
LT1766EGN-5#TRPBF SSOP-16 E $3.71 Yes
LT1766EGN#PBF SSOP-16 E $4.32 $3.65 Yes
LT1766EGN#TRPBF SSOP-16 E $3.71 Yes
LT1766HFE#PBF TSSOP-16 H $6.71 $4.70 Yes
LT1766HFE#TRPBF TSSOP-16 H $4.82 Yes
LT1766IFE-5#PBF TSSOP-16 I $6.36 $4.45 Yes
LT1766IFE-5#TRPBF TSSOP-16 I $4.57 Yes
LT1766IFE#PBF TSSOP-16 I $6.36 $4.45 Yes
LT1766IFE#TRPBF TSSOP-16 I $4.57 Yes
LT1766IGN-5#PBF SSOP-16 I $5.15 $4.35 Yes
LT1766IGN-5#TRPBF SSOP-16 I $4.41 Yes
LT1766IGN#PBF SSOP-16 I $5.15 $4.35 Yes
LT1766IGN#TRPBF SSOP-16 I $4.41 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
DC326B LT1766EGN | 200KHz High Voltage Buck Converter, 5.5 - 60Vin @ up to 1A, Jmpr selectable 3.3 or 5Vout $100.00
DC326C LT1766EFE | 1.5A, 200kHz High Voltage Buck Converter, Vin = 6V-60V, Vout = 5V @ 1A $100.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data 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
LT1766HFE#PBF TSSOP-16 H $6.71 $4.70 Yes
LT1766HFE#TRPBF TSSOP-16 H $4.82 Yes
LT1766IFE-5#PBF TSSOP-16 I $6.36 $4.45 Yes
LT1766IFE-5#TRPBF TSSOP-16 I $4.57 Yes
LT1766IFE#PBF TSSOP-16 I $6.36 $4.45 Yes
LT1766IFE#TRPBF TSSOP-16 I $4.57 Yes
LT1766IGN-5#PBF SSOP-16 I $5.15 $4.35 Yes
LT1766IGN-5#TRPBF SSOP-16 I $4.41 Yes
LT1766IGN#PBF SSOP-16 I $5.15 $4.35 Yes
LT1766IGN#TRPBF SSOP-16 I $4.41 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

  • High Voltage, Industrial and Automotive
  • Portable Computers
  • Battery-Powered Systems
  • Battery Chargers
  • Distributed Power Systems

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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
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Models for the following parts are available in LTspice:
LT1766

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