LTC1470 - Single and Dual PCMCIA Protected 3.3V/5V VCC Switches

Features

  • Single 3.3V/5V Switch in 8-Pin SO Package
  • Dual 3.3V/5V Switch in 16-Pin SO Package
  • Built-In Current Limit and Thermal Shutdown
  • Built-In Charge Pumps (No 12V Required)
  • Extremely Low RDS(ON) MOSFET Switches
  • Output Current Capability: 1A
  • Inrush Current Limited (Drives 150µF Loads)
  • Quiescent Current in Standby: 1µA
  • No Parasitic Body Diodes
  • Built-In XOR Function Eliminates “Glue” Logic
  • Break-Before-Make Switching
  • Controlled Rise and Fall Times

Typical Application

LTC1470 Typical Application
LTC1470 Typical Application

Description

The LTC®1470 switches the VCC pins of a Personal Computer Memory Card International Association (PCMCIA) card slot between three operating states: OFF, 3.3V and 5V. Two low RDS(ON) N-channel power MOSFETs are driven by a built-in charge pump which generates a voltage higher than the supply voltage to fully enhance each switch when selected by the input control logic.

The LTC1470 inputs are compatible with industry standard PCMCIA controllers. A built-in XOR ensures that both switches are never on at the same time. This function also makes the LTC1470 compatible with both active-low and active-high controllers (see Applications Information section). The switch rise times are controlled to eliminate power supply glitching.

The LTC1470 features built-in SafeSlot™ current limit and thermal shutdown. The output is limited to 1A during short circuit to ground but 2A of peak operating current is allowed.

The LTC1471 is a dual version of the LTC1470 and is available in a 16-pin SO package.

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
LTC1470CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1470CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1470ES8#PBF SO-8 S8 E 05-08-1610 (S8) Yes
LTC1470ES8#TRPBF SO-8 S8 E 05-08-1610 (S8) Yes


LTC1470 Package Drawing
LTC1470 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
LTC1470CS8#PBF SO-8 C $3.00 $2.45 Yes
LTC1470CS8#TRPBF SO-8 C $2.51 Yes
LTC1470ES8#PBF SO-8 E $3.84 $2.70 Yes
LTC1470ES8#TRPBF SO-8 E $2.76 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 Computers
  • Palmtop Computers
  • Pen-Based Computers
  • Handi-Terminals
  • PC Card Reader/Writers
  • 3.3V/5V Power Supply Switch

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

Technical Support