LTC2953 - Push Button On/Off Controller with Voltage Monitoring

Features

  • Wide Operating Voltage Range: 2.7V to 27V
  • Push Button Control of System Power
  • Low Supply Current: 14µA
  • Power Fail Comparator Generates Warning
  • UVLO Comparator Gracefully Latches Power Off
  • Adjustable Supply Monitor with 200ms Reset
  • Adjustable Power Down Timer
  • Low Leakage EN Output (LTC2953-1) Allows DC/DC Converter Control
  • High Voltage EN Output (LTC2953-2) Allows Circuit Breaker Control
  • Simple Interface Allows Orderly System Power Up and Power Down
  • ±1.5% Threshold Tolerances
  • ±10kV ESD HBM on PB Input
  • 12-Pin 3mm x 3mm DFN

Typical Application

LTC2953 Typical Application
LTC2953 Typical Application

Description

The LTC2953 is a push button On/Off controller that manages system power via a push button interface. An enable output toggles system power while an interrupt output provides debounced push button status. The interrupt output can be used in menu driven applications to request a system power down.

The LTC2953 also features input and output power supply monitors. An uncommitted power fail comparator provides real time input monitor information, while a de-glitched under voltage lockout comparator gracefully initiates a system power down. The under voltage lockout comparator prevents the system from powering from a low power supply.

The adjustable supply monitor input is compared against an accurate internal 0.5V reference. The reset output remains low until the supply monitor input has been in compliance for 200ms.

The LTC2953 operates over a wide 2.7V to 27V input voltage range and draws only 14µA of current. Two versions of the part accommodate either positive or negative enable polarities.

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
LTC2953CDD-1#PBF 3x3 DFN-12 DD C 05-08-1725 Yes
LTC2953CDD-1#TRPBF 3x3 DFN-12 DD C 05-08-1725 Yes
LTC2953CDD-2#PBF 3x3 DFN-12 DD C 05-08-1725 Yes
LTC2953CDD-2#TRPBF 3x3 DFN-12 DD C 05-08-1725 Yes
LTC2953IDD-1#PBF 3x3 DFN-12 DD I 05-08-1725 Yes
LTC2953IDD-1#TRPBF 3x3 DFN-12 DD I 05-08-1725 Yes
LTC2953IDD-2#PBF 3x3 DFN-12 DD I 05-08-1725 Yes
LTC2953IDD-2#TRPBF 3x3 DFN-12 DD I 05-08-1725 Yes


LTC2953 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
LTC2953CDD-1#PBF 3x3 DFN-12 C $3.29 $2.30 Yes
LTC2953CDD-1#TRPBF 3x3 DFN-12 C $2.36 Yes
LTC2953CDD-2#PBF 3x3 DFN-12 C $3.29 $2.30 Yes
LTC2953CDD-2#TRPBF 3x3 DFN-12 C $2.36 Yes
LTC2953IDD-1#PBF 3x3 DFN-12 I $3.94 $2.76 Yes
LTC2953IDD-1#TRPBF 3x3 DFN-12 I $2.82 Yes
LTC2953IDD-2#PBF 3x3 DFN-12 I $3.94 $2.76 Yes
LTC2953IDD-2#TRPBF 3x3 DFN-12 I $2.82 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.

Part Number Description Price Documentation
DC1099A LTC2953 Push-Button Controller with Dual Battery Monitor $25.00
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Click here to view our complete list of demo boards

Applications

  • Push Button Power Path Control
  • Battery Power Supervisor
  • Portable Instrumentation, PDA
  • Blade Servers
  • Desktop and Notebook Computers

Product Notifications

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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:
LTC2953-1
LTC2953-2

Technical Support