LTC2924IGN#PBF

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 host supply. This 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. Typical applications are sequenced power supplies for ASICs with multiple I/O and core voltages, latch-up prevention in systems with multiple power supplies.

• Errors in power supply sequencing and control input are detected and reported at the FAULT output
• Precision input comparators which can provide 1% accuracy in monitoring power supply voltages
• Fully sequence and monitor four supplies, six with minimal external circuitry
• Cascadable for additional supplies, power off in reverse order or simultaneously
• Drives power supply shutdown pins with no external pull-up resistors
• 10µA output current allows soft-starting of supplies, power good timer
• Done indicator for both power on and power off, adjustable time delay between power supplies
• Power supply voltage monitoring and power sequence error detection and reporting
• 16-lead plastic SSOP package
• Temperature rating range from –40°C to 85°C

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party