LTC1155 - Dual High Side Micropower MOSFET Driver

Features

  • Fully Enhances N-Channel Power MOSFETs
  • 8μA Standby Current
  • 85μA ON Current
  • Short-Circuit Protection
  • Wide Power Supply Range: 4.5V to 18V
  • Controlled Switching ON and OFF Times
  • No External Charge Pump Components
  • Replaces P-Channel High Side MOSFETs
  • Compatible with Standard Logic Families
  • Available in 8-Pin SO Package

Typical Application

LTC1155 Typical Application
LTC1155 Typical Application

Description

The LTC®1155 dual high side gate driver allows using low cost N-channel FETs for high side switching applications. An internal charge pump boosts the gate above the positive rail, fully enhancing an N-channel MOSFET with no external components. Micropower operation, with 8μA standby current and 85μA operating current, allows use in virtually all systems with maximum efficiency.

Included on-chip is overcurrent sensing to provide automatic shutdown in case of short circuits. A time delay can be added in series with the current sense to prevent false triggering on high in-rush loads such as capacitors and incandescent lamps.

The LTC1155 operates off of a 4.5V to 18V supply input and safely drives the gates of virtually all FETs. The LTC1155 is well suited for low voltage (battery-powered) applications, particularly where micropower “sleep” operation is required.

The LTC1155 is available in both 8-pin PDIP and 8-pin SO packages.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

SO-8, N-8

LTC1155 Package Drawing
LTC1155 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC1155CN8 PDIP 8 C $3.50 $2.90 View
LTC1155CN8#PBF PDIP 8 C $3.50 $2.90 View
LTC1155CS8 SO 8 C $3.75 $3.10 View
LTC1155CS8#PBF SO 8 C $3.75 $3.10 View
LTC1155CS8#TR SO 8 C $3.16 View
LTC1155CS8#TRPBF SO 8 C $3.16 View
LTC1155IN8 PDIP 8 I $4.60 $3.70 View
LTC1155IN8#PBF PDIP 8 I $4.60 $3.70 View
LTC1155IS8 SO 8 I $4.90 $4.00 View
LTC1155IS8#PBF SO 8 I $4.90 $4.00 View
LTC1155IS8#TR SO 8 I $4.06 View
LTC1155IS8#TRPBF SO 8 I $4.06 View
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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

  • Laptop Power Bus Switching
  • SCSI Termination Power Switching
  • Cellular Phone Power Management
  • P-Channel Switch Replacement
  • Relay and Solenoid Drivers
  • Low Frequency Half H-Bridge
  • Motor Speed and Torque Control

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Design Tools

LTspiceIV

LTspice IV 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 IV

Models for the following parts are available in LTspice IV:
LTC1155

Technical Support