LTC2924 - Quad Power Supply Sequencer

Features

  • Fully Sequence and Monitor Four Supplies
    – Six with Minimal External Circuitry
  • Cascadable for Additional Supplies
  • Power Off in Reverse Order or Simultaneously
  • Charge Pump Drives External MOSFETs
  • Drives Power Supply Shutdown Pins with No External Pull-Up Resistors
  • 10µA Output Current Allows Soft-Starting of Supplies
  • Done Indicator for Both Power On and Power Off
  • Adjustable Time Delay Between Power Supplies
  • Power Good Timer
  • Power Supply Voltage Monitoring and Power Sequence Error Detection and Reporting
  • Available in a 16-Lead Narrow SSOP Package

Typical Application

LTC2924 Typical Application
LTC2924 Typical Application
LTC2924 Typical Application

Description

The LTC®2924 is a power supply sequencer designed for use with external N-channel MOSFETs or power supplies with shutdown pins. Four power supplies can be fully sequenced by a single LTC2924 and up to five supplies can be sequenced to a sixth master supply. The LTC2924 requires a minimum of external components, using only two feedback resistors per sequenced power supply and a single resistor to set hysteresis.

An internally regulated charge pump provides gate drive voltages for external logic and sub-logic-level MOSFETs. Adding a single capacitor enables an adjustable time delay between power supplies during both Power On and Power Off sequencing. A second capacitor can be added to enable a power good timer for detecting the failure of any power supply to turn on within the selected time. Errors in power supply sequencing and the control input are detected and reported at the FAULT output. The LTC2924 features precision input comparators which can provide 1% accuracy in monitoring power supply voltages.

Multiple LTC2924s may be easily cascaded to sequence a virtually unlimited number of power supplies.

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
LTC2924CGN#PBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC2924CGN#TRPBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC2924IGN#PBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LTC2924IGN#TRPBF SSOP-16 GN I 05-08-1641 (GN16) Yes


LTC2924 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
LTC2924CGN#PBF SSOP-16 C $3.50 $2.65 Yes
LTC2924CGN#TRPBF SSOP-16 C $2.71 Yes
LTC2924IGN#PBF SSOP-16 I $4.17 $3.15 Yes
LTC2924IGN#TRPBF SSOP-16 I $3.21 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
DC818A LTC2924 Quad Supply Sequencer $50.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • Sequenced Power Supplies for ASICs with Multiple I/O and Core Voltages
  • Latch-Up Prevention in Systems with Multiple Power Supplies

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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:
LTC2924

Technical Support