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
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 |
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 | ||
| Buy Now • Request Samples | ||||||
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 | |||
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
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
