ISL8723IRZR5369

Power Supply Controllers, Monitors Overview

The Intersil ISL8723IRZR5369 is a four-channel power sequencing controller designed to manage the turn-on and turn-off sequence of multiple voltage rails. It operates from a 2.5V to 5V supply and supports monitoring voltages from 0.7V to 5V. The device features an integrated charge pump providing VDD +5.3V gate drive for external N-channel MOSFETs. It includes adjustable voltage slew rates, undervoltage lockout (UVLO) for each monitored rail, and glitch immunity. A low-power sleep state draws 30µA, and an active-high ENABLE input controls operation.

Power Supply Controllers, Monitors Feature Summary

• Enables arbitrary turn-on and turn-off sequencing of up to four independent power supplies with flexible threshold programming via external resistors.
• Integrates a charge pump to generate gate drive voltage exceeding the IC bias by 5.3V, allowing control of low-cost N-channel MOSFET switches.
• Supports daisy-chaining multiple sequencers to manage an infinite number of independent voltages in larger system architectures.
• Provides individual undervoltage lockout protection for each monitored supply voltage to ensure compliance before enabling outputs.

Power Supply Controllers, Monitors Applications

• Graphics cards
• FPGA/ASIC/microprocessor/PowerPC supply sequencing
• Network Routers
• Telecommunications Systems

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix IRZR5369 against official Intersil or Renesas documentation to confirm package type, tape-and-reel specifications, and temperature range. Ensure the active-high enable logic matches system requirements, as the companion ISL8724 utilizes active-low enable. Confirm RoHS compliance status and lead-free designation through current manufacturer datasheets prior to procurement.

Power Supply Controllers, Monitors Selection Notes

Select this component when precise sequencing of up to four rails is required with minimal standby current consumption. The integrated charge pump eliminates the need for external bootstrap circuits, simplifying BOM. Consider the adjustable slew rate for EMI reduction and the daisy-chain capability if the design requires sequencing more than four independent voltages without additional complex logic.

Power Supply Controllers, Monitors Part Context

The ISL8723 belongs to the Intersil family of power sequencing controllers, alongside the ISL8724. While both devices offer four-channel sequencing and similar electrical characteristics, they differ in enable input polarity; the ISL8723 uses an active-high enable, whereas the ISL8724 uses an active-low enable. This distinction is critical for interface compatibility with system control logic.

Power Supply Controllers, Monitors Replacement Considerations

The ISL8724 is a functional substitute within the same family but requires attention to the active-low enable input difference. Verify that the system logic can accommodate the inverted enable signal or adjust circuitry accordingly. No other direct cross-model substitutes are documented in the provided source material.