LT1961 - 1.5A, 1.25MHz Step-Up Switching Regulator

Features

  • 1.5A Switch in a Small MSOP-8 Package
  • Constant 1.25MHz Switching Frequency
  • Wide Operating Voltage Range: 3V to 25V
  • High Efficiency 0.2 Ohms Switch
  • 1.2V Feedback Reference Voltage
  • 2% Overall Output Voltage Tolerance
  • Uses Low Profile Surface Mount External Components
  • Low Shutdown Current: 6µA
  • Synchronizable from 1.5MHz to 2MHz
  • Current-Mode Loop Control
  • Constant Maximum Switch Current Rating at All Duty Cycles*
  • Thermally Enhanced Exposed Pad 8-Lead Plastic
    MSOP Package
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LT1961 Typical Application
LT1961 Typical Application

Description

The LT1961 is a 1.25MHz monolithic boost switching regulator. A high efficiency 1.5A, 0.2 Ohm 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 voltage 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 maintains high 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 LT1961 is available in an exposed pad, 8-pin MSOP package. Full cycle-by-cycle switch current limit protection 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

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
LT1961EMS8E#PBF MS-8E MS8E E 05-08-1662 Yes
LT1961EMS8E#TRPBF MS-8E MS8E E 05-08-1662 Yes
LT1961IMS8E#PBF MS-8E MS8E I 05-08-1662 Yes
LT1961IMS8E#TRPBF MS-8E MS8E I 05-08-1662 Yes


LT1961 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
LT1961EMS8E#PBF MS-8E E $2.01 $1.69 Yes
LT1961EMS8E#TRPBF MS-8E E $1.75 Yes
LT1961IMS8E#PBF MS-8E I $3.43 $2.40 Yes
LT1961IMS8E#TRPBF MS-8E I $2.46 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
DC433A LT1961EMS8E | Adjustable Output Boost Regulator, +2.8V to 12V Input, +12Vout $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
LT1961IMS8E#PBF MS-8E I $3.43 $2.40 Yes
LT1961IMS8E#TRPBF MS-8E I $2.46 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

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

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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

Models for the following parts are available in LTspice:
LT1961

Technical Support