Monitor, Control and Protection High Side Switches & MOSFET Drivers

LTC1157 - 3.3V Dual Micropower High-Side/Low-Side MOSFET Driver

Features

  • 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

Typical Application

LTC1157 Typical Application
LTC1157 Typical Application

Description

The LTC1157 dual 3.3V micropower MOSFET gate driver makes it possible to switch either supply or ground reference loads through a low R DS(ON) Nchannel switch (N-channel switches are required at 3.3V because P-channel MOSFETS do not have guaranteed R DS(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.

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
LTC1157CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LTC1157CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1157CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes


LTC1157 Package Drawing
LTC1157 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
LTC1157CN8#PBF N-8 C $3.00 $2.45 Yes
LTC1157CS8#PBF SO-8 C $3.15 $2.55 Yes
LTC1157CS8#TRPBF SO-8 C $2.61 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

  • 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

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Design Tools

LTspice

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Models for the following parts are available in LTspice:
LTC1157

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