LT1767 - Monolithic 1.5A, 1.25MHz Step-Down Switching Regulators

Features

  • 1.5A Switch in a Small MSOP Package
  • Constant 1.25MHz Switching Frequency
  • High Power Exposed Pad (MS8E) Package
  • Wide Operating Voltage Range: 3V to 25V
  • High Efficiency 0.22Ω Switch
  • 1.2V Feedback Reference Voltage
  • Fixed Output Voltages of 1.8V, 2.5V, 3.3V, 5V
  • 2% Overall Output Tolerance
  • Uses Low Profile Surface Mount Components
  • Low Shutdown Current: 6μA
  • Synchronizable to 2MHz
  • Current Mode Loop Control
  • Constant Maximum Switch Current Rating at All Duty Cycles*

Typical Application

LT1767 Typical Application
LT1767 Typical Application

Description

The LT®1767 is a 1.25MHz monolithic buck switching regulator. A high efficiency 1.5A, 0.22Ω switch is included on the die together with all the control circuitry required to complete a high frequency, current mode switching regulator. Current mode control provides fast transient response and excellent loop stability.

New design techniques achieve high efficiency at high switching frequencies over a wide operating range. A low dropout internal regulator maintains consistent performance over a wide range of inputs from 24V systems to Li-Ion batteries. An operating supply current of 1mA improves efficiency, especially at lower output currents. Shutdown reduces quiescent current to 6μA. Maximum switch current remains constant at all duty cycles. Synchronization allows an external logic level signal to increase the internal oscillator from 1.5MHz to 2MHz.

The LT1767 is available in an 8-pin MSOP fused lead-frame package and a low thermal resistance exposed pad package. Full cycle-by-cycle current limit and thermal shutdown are provided. High frequency operation allows the reduction of input and output filtering components and permits the use of chip inductors.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT1767EMS8-1.8#PBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8-1.8#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8-2.5#PBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8-2.5#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8-3.3#PBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8-3.3#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8-5#PBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8-5#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8#PBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8E-1.8#PBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8E-1.8#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8E-2.5#PBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8E-2.5#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8E-3.3#PBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8E-3.3#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8E-5#PBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8E-5#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8E#PBF MS-8 MS8 E 05-08-1660 Yes
LT1767EMS8E#TRPBF MS-8 MS8 E 05-08-1660 Yes


LT1767 Package Drawing
LT1767 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
LT1767EMS8-1.8#PBF MS-8 E $3.45 $2.95 Yes
LT1767EMS8-1.8#TRPBF MS-8 E $3.01 Yes
LT1767EMS8-2.5#PBF MS-8 E $3.45 $2.95 Yes
LT1767EMS8-2.5#TRPBF MS-8 E $3.01 Yes
LT1767EMS8-3.3#PBF MS-8 E $3.45 $2.95 Yes
LT1767EMS8-3.3#TRPBF MS-8 E $3.01 Yes
LT1767EMS8-5#PBF MS-8 E $3.45 $2.95 Yes
LT1767EMS8-5#TRPBF MS-8 E $3.01 Yes
LT1767EMS8#PBF MS-8 E $3.45 $2.95 Yes
LT1767EMS8#TRPBF MS-8 E $3.01 Yes
LT1767EMS8E-1.8#PBF MS-8 E $4.36 $3.05 Yes
LT1767EMS8E-1.8#TRPBF MS-8 E $3.11 Yes
LT1767EMS8E-2.5#PBF MS-8 E $4.36 $3.05 Yes
LT1767EMS8E-2.5#TRPBF MS-8 E $3.11 Yes
LT1767EMS8E-3.3#PBF MS-8 E $4.36 $3.05 Yes
LT1767EMS8E-3.3#TRPBF MS-8 E $3.11 Yes
LT1767EMS8E-5#PBF MS-8 E $4.36 $3.05 Yes
LT1767EMS8E-5#TRPBF MS-8 E $3.11 Yes
LT1767EMS8E#PBF MS-8 E $4.36 $3.05 Yes
LT1767EMS8E#TRPBF MS-8 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
DC502A LT1767EMS8E | 1.25MHz Wide Input Range Step Down DC/DC Converter, 3V to 25V Input, 5V/3/3Vout @ 1A $75.00
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Click here to view our complete list of demo boards

Applications

  • DSL Modems
  • Portable Computers
  • Wall Adapters
  • Battery-Powered Systems
  • Distributed Power

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Design Tools

LTspiceIV

LTspice® IV 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 IV

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 IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV 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 IV:
LT1767
LT1767-1.8
LT1767-2.5
LT1767-3.3
LT1767-5

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