LTC2955
Info : RECOMMENDED FOR NEW DESIGNS
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LTC2955

Pushbutton On/Off Controller with Automatic Turn-On

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 16
1ku List Price Starting From $2.39
Features
  • Automatic Turn-On Via Voltage Monitor Input
  • Wide Input Supply Range: 1.5V to 36V
  • Low Supply Current: 1.2μA
  • ±25kV ESD HBM on PB Input
  • ±36V Wide Input Voltage for PB Input
  • Low Leakage EN Output Allows DC/DC Converter Control (LTC2955-1)
  • High Voltage EN Output Drives External P-Channel MOSFET (LTC2955-2)
  • Simple Interface Allows Graceful μP Shutdown
  • Adjustable Turn-Off Timer
  • 10-Lead 3mm × 2mm DFN and 8-Lead ThinSOT Packages
Additional Details
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The LTC2955 is a micropower, pushbutton on/off controller that manages system power by generating a clean enable output from the supply monitor input and the debounced pushbutton input. It features an interrupt output that notifies the system of a pushbutton or low supply event. When the system is ready, it may use the power kill input to shut off power. If the pushbutton remains pressed for more than the configurable turn-off duration, the system power is forced off.

The supply input covers a wide range from 1.5V to 36V. The robust pushbutton input handles wide voltage swings of ±36V and ESD strikes to ±25kV (human body model) without latchup or damage. A low 1.2μA supply current maximizes battery run time. Separate versions are available for positive or negative enable polarities.

Applications

  • Desktop and Notebook Computers
  • GPS Devices
  • Portable Instruments
  • Automotive Electronics
Part Models 16
1ku List Price Starting From $2.39

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC2955CDDB-1#TRMPBF
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LTC2955CDDB-1#TRPBF
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LTC2955CDDB-2#TRMPBF
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LTC2955CDDB-2#TRPBF
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LTC2955CTS8-1#TRMPBF
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LTC2955CTS8-1#TRPBF
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LTC2955CTS8-2#TRMPBF
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LTC2955CTS8-2#TRPBF
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LTC2955IDDB-1#TRMPBF
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LTC2955IDDB-1#TRPBF
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LTC2955IDDB-2#TRMPBF
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LTC2955IDDB-2#TRPBF
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LTC2955ITS8-1#TRMPBF
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LTC2955ITS8-1#TRPBF
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LTC2955ITS8-2#TRMPBF
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LTC2955ITS8-2#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 3

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DC1836A-B

LTC2955IDDB-2 | Pushbutton On/Off Controller with Automatic Turn On (EN Output)

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DC1836A-A

LTC2955IDDB-1 | Pushbutton On/Off Controller with Automatic Turn On (EN Output)

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AD-SYNCHRONA14-EBZ

Multichannel System Clocking Device

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AD-SYNCHRONA14-EBZ

Multichannel System Clocking Device

Multichannel System Clocking Device

Features and Benefits

Processing System

  • Raspberry Pi 4, ARM Cortex-A72, 2GB SDRAM

User Interfaces

  • Gigabit Ethernet
  • 2 × USB 3.0 ports
  • 2 × USB 2.0 ports
  • SPI interface
  • GPIO
  • 2 bicolor LEDs
  • Male pin header

Clock Processing Devices

  • HMC7044 (High Performance, 3.2 GHz, 14-Output Jitter Attenuator)
  • AD9545 (1 PPS Synchronizer and Adaptive Clock Translator)

Clock Outputs

  • 4 x TWINAX LVPECL AC&DC coupled, 100Ω diff
  • 2 x SMA LVPECL AC coupled*
  • 4 x SMA CMOS*
  • 4 x SMA LVDS AC coupled*

*Configurable differential outputs, 50Ω diff

Clock Inputs

  • 3 differential 100Ω SMA clock inputs
  • PPS input
  • SYNC input
  • 10MHz input

Internal references

  • 100Mhz and 122.88Mhz Ultra-Low Phase Noise VCXO's (-165dBc/Hz)
  • 40Mhz and 38.4Mhz TCXO's (±1ppm) 50MHz OCXO(+/- 10ppb)
  • Internal references are software configurable

Power supply

  • DC 12V, 3A barrel jack

Product Detail

The AD-SYNCHRONA14-EBZ is an ideal self-contained device to use in evaluation and prototyping of applications that need a highly accurate frequency and phase-controlled source clock. It is designed around the Analog Devices AD9545 and HMC7044 and greatly simplifies clock distribution and multi-channel synchronization in complex systems. It is intended to be used by trained professionals in a laboratory environment, and not intended as an end product for commercial use. It can be taken as a complete reference design and customised as required for any end customer applications. Full design details are made available free of charge.

The AD-SYNCHRONA14-EBZ comes in a 1U mechanical form factor. Using popular industry connector SMA and TwinAX interfaces most labs will already have the needed cables.

With its internal OCXO it can operate in standalone mode or be fed from a choice of external sources, such as 3 separate high speed differential clock inputs, a 10MHz reference and 1PPS. This flexibility combined with the capability to select either of the internal VCXO options of 100MHz or 122.88MHz, gives almost unlimited choice for the frequency of interest and accuracy needed for a wide variety of application areas. 

APPLICATIONS

  • High accuracy reference clock distribution
  • Systems clocked from a single source
  • Clocks derived from 100MHz or 122.88MHz
  • Phased Array Systems, RADAR, EW, SATCOMS, SDR
  • Bench Equipment
  • Remote controlled operation
Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

Reference Designs

Reference Designs 1

Portable Radio Reference Design Block Diagram

ADRV-PACKRF Robust Portable Radio Design

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CN0412

ADRV-PACKRF Robust Portable Radio Design

CN0412

Circuits from the lab

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ADRV-PACKRF Robust Portable Radio Design

Features and Benefits

  • Two Complete Radios
    • 2-Tx, 2-Rx, 2-Observation
  • Multiple Power Options
    • Wall Connected, Power over Ethernet, Battery
  • Built in IMU and GPS for tracking
  • Fully configurable and customizable software
View Detailed Reference Design external link

Design & Integration Tools

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