Monitor, Control and Protection High Side Switches & MOSFET Drivers

LTC1981 - Single and Dual Micropower High Side Switch Controllers in SOT-23

Features

  • No External Components Required
  • Internal Voltage Triplers Produce High Side Gate Drive for Logic Level FETs
  • Ultralow Power:
    10µA Per Driver ON Current (LTC1982)
    20µA ON Current (LTC1981)
    <1µA Shutdown Current
  • VCC Range: 1.8V to 5V
  • Gate Drive Outputs Driven to Ground During Shutdown
  • Gate Drive Outputs Internally Clamped to 7.5V Max
  • “Gate Drive Ready” Output (LTC1981)
  • Ultrasmall Application Circuit
  • 5-Pin SOT-23 Package (LTC1981)
  • 6-Pin SOT-23 Package (LTC1982)

Typical Application

LTC1981 Typical Application
LTC1981 Typical Application

Description

The LTC® 1981/LTC1982 are low-power, self-contained N-channel MOSFET drivers. An internal voltage tripler allows gates to be driven without the use of any external components. Internal regulation circuitry allows quiescent current to drop to 10µA per driver (20µA for LTC1981) once the gates are charged.

Low quiescent current and low shutdown current (under 1µA) make these parts ideal for battery and other power constrained systems. The wide input voltage range accommodates a variety of battery/input configurations.

Gate drive is internally clamped to 7.5V providing protection to the external MOSFET gate. The MOSFETs can be driven in either high side or low side mode.

The LTC1981 single driver version also includes a gate drive ready pin and twice the drive current capacity of the dual driver LTC1982.

The LTC1981 is available in a 5-pin SOT-23. The LTC1982 is available in a 6-pin SOT-23.

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
LTC1981ES5#PBF SOT-23 S5 E 05-08-1635 Yes
LTC1981ES5#TRMPBF SOT-23 S5 E 05-08-1635 Yes
LTC1981ES5#TRPBF SOT-23 S5 E 05-08-1635 Yes


LTC1981 Package Drawing
LTC1981 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
LTC1981ES5#PBF SOT-23 E $1.48 Yes
LTC1981ES5#TRMPBF SOT-23 E $1.48 $1.28 Yes
LTC1981ES5#TRPBF SOT-23 E $1.48 $1.26 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.

Click here to view our complete list of demo boards

Applications

  • Cellular Telephones
  • Portable POS Terminal
  • Handheld Battery Powered Equipment

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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:
LTC1981

Technical Support