Overview
Features and Benefits
- 1.5A Switch in a Small MSOP-8 Package
- Constant 1.25MHz Switching Frequency
- Wide Operating Voltage Range: 3V to 25V
- High Efficiency 0.2Ω 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
Product Details
The LT1961 is a 1.25MHz monolithic boost switching regulator. A high efficiency 1.5A, 0.2Ω 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.
Applications
- DSL Modems
- Portable Computers
- Battery-Powered Systems
- Distributed Power
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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R365 Reliability Data3/23/2018
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DC433A - Demo Manual9/24/2009
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Tiny 1.25MHz Monolithic Boost Regulator Has 1.5A Switch and Wide Input Voltage Range12/1/2002 LT Journal
Tools & Simulations
LTspice
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Models for the following parts are available in LTspice:
Product Recommendations
LT1961 Companion Parts
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
---|---|---|---|---|
LT1961EMS8E#PBF | Material Declaration | Reliability Data | 8-Lead MSOP w/ EP | |
LT1961EMS8E#TRPBF | Material Declaration | Reliability Data | 8-Lead MSOP w/ EP | |
LT1961IMS8E#PBF | Material Declaration | Reliability Data | 8-Lead MSOP w/ EP | |
LT1961IMS8E#TRPBF | Material Declaration | Reliability Data | 8-Lead MSOP w/ EP | |
Wafer Fabrication Data | R365 Reliability Data |
PCN-PDN Information
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Support & Discussions
Sample & Buy
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Lead Times
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.