1. Products
  2. Power Monitor, Control, and Protection
  3. High-Side Switches and MOSFET Drivers
  4. LTC1157


Features and Benefits

  • Allows Lowest Drop 3.3V Supply Switching
  • Operates on 3.3V or 5V Nominal Supplies
  • 3 Microamps Standby Current
  • 80 Microamps ON Current
  • Drives Low Cost N-Channel Power MOSFETs
  • No External Charge Pump Components
  • Controlled Switching ON and OFF Times
  • Compatible with 3.3V and 5V Logic Families
  • Available in 8-Pin SOIC

Product Details

The LTC1157 dual 3.3V micropower MOSFET gate driver makes it possible to switch either supply or ground reference loads through a low RDS(ON) Nchannel switch (N-channel switches are required at 3.3V because P-channel MOSFETS do not have guaranteed RDS(ON) with VGS ≤ 3.3V). The LTC1157 internal charge pump boosts the gate drive voltage 5.4V above the positive rail (8.7V above ground), fully enhancing a logic level N-channel switch for 3.3V high-side applications and a standard N-channel switch for 3.3V low-side applications.

The gate drive voltage at 5V is typically 8.8V above supply (13.8V above ground), so standard N-channel MOSFET switches can be used for both high-side and low-side applications. Micropower operation, with 3µA standby current and 80µA operating current, makes the LTC1157 well suited for battery-powered applications.

The LTC1157 is available in both 8-pin DIP and SOIC.


  • Notebook Computer Power Management
  • Palmtop Computer Power Management
  • P-Channel Switch Replacement
  • Battery Charging and Management
  • Mixed 5V and 3.3V Supply Switching
  • Stepper Motor and DC Motor Control
  • Cellular Telephones and Beepers

Product Lifecycle icon-recommended 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.

Tools & Simulations


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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
LTC1157CN8#PBF Material Declaration Reliability Data 8-Lead PDIP (Narrow 0.3 Inch)
LTC1157CS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
LTC1157CS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
Wafer Fabrication Data R294 Reliability Data

PCN-PDN Information

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Sample & Buy

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Buy Now Pricing

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List Pricing

(*)The 1Ku 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 Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

Please see the latest communication from our CCO regarding lead times.



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