LT1166 - Power Output Stage Automatic Bias System

Features

  • Set Class AB Bias Currents
  • Eliminates Adjustments
  • Eliminates Thermal Runaway of IQ
  • Corrects for Device Mismatch
  • Simplifies Heat Sinking
  • Programmable Current Limit
  • May Be Paralleled for Higher Current
  • Small SO-8 or PDIP Package paralleled to obtain higher output current.

Typical Application

LT1166 Typical Application
LT1166 Typical Application

Description

The LT1166 is a bias generating system for controlling class AB output current in high powered amplifiers. When connected with external transistors, the circuit becomes a unity-gain voltage follower. The LT1166 is ideally suited for driving power MOSFET devices because it eliminates all quiescent current adjustments and critical transistor matching. Multiple output stages using the LT1166 can be paralleled to obtain higher output current. Thermal runaway of the quiescent point is eliminated because the bias system senses the current in each power transistor by using a small external sense resistor. A high speed regulator loop controls the amount of drive applied to each power device. The LT1166 can be biased from a pair of resistors or current sources and because it operates on the drive voltage to the output transistors, it operates on any supply voltage.

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
LT1166CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1166CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1166CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes


LT1166 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
LT1166CN8#PBF N-8 C $2.60 $2.40 Yes
LT1166CS8#PBF SO-8 C $3.25 $2.60 Yes
LT1166CS8#TRPBF SO-8 C $2.66 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

  • Biasing Power MOSFETs
  • High Voltage Amplifiers
  • Shaker Table Amplifiers
  • Audio Power Amplifiers

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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:
LT1166

Technical Support