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Product Detailed Parameters
- Description：IC REG QUAD BUCK/LNR SYNC 32QFN
- Series：-
- Mfr：Renesas Electronics Corporation
- Package：Tape & Reel (TR)
- Topology：Step-Down (Buck) Synchronous (3), Linear (LDO) (1)
- Number of Outputs：4
- Frequency - Switching：300kHz
- Voltage/Current - Output 1：Controller
- Voltage/Current - Output 2：Controller
- Voltage/Current - Output 3：Controller
- w/LED Driver：No
- w/Supervisor：No
- w/Sequencer：No
- Voltage - Supply：4.5V ~ 24V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：32-VFQFN Exposed Pad
- Supplier Device Package：32-QFN (5x5)
- Grade：-
- Qualification：-
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Overview
The ISL9440IRZ-T is a quad-output power management IC featuring three synchronous buck controllers and one low-dropout linear regulator controller. It operates within a supply voltage range of 4.5V to 24V and supports a switching frequency of 300kHz. The device utilizes current mode control with feed forward and internal loop compensation, housed in a 32-VFQFN package.
Feature Summary
- Integrates three PWM controllers synchronized at 180 degrees out of phase to reduce input ripple.
- Includes an early warning function that outputs a logic signal when input voltage drops below a threshold.
- Features independent enable inputs for flexible supply rail sequencing.
- Provides integrated UV/OV/OC/OT protections for system reliability.
Applications
- Cable and satellite set-top boxes
- VoIP gateways
- Cable modems
- Home connectivity products
Procurement Notes
Verify component authenticity through authorized channels as the part status is End-of-Life. Confirm package integrity and pin alignment against the 32-QFN specification. Review official datasheets for any post-manufacturing changes or alternative sourcing options due to discontinuation.
Selection Notes
Select this component for designs requiring four distinct output rails from a single controller. Ensure the application benefits from the 300kHz switching frequency and the specific integration of one LDO alongside three synchronous buck converters. Verify thermal requirements align with the QFN package capabilities.
Part Context
This part belongs to the ISL9440 family, which includes variants like the ISL9440A and ISL9441. These devices are designed to provide multi-rail power solutions for compact electronic systems. The family shares core architecture but differs in features such as switching frequency and early warning capabilities.
Replacement Considerations
ISL9440AIRZ-T is listed as a parameter equivalent substitute. ISL9441IRZ-T is also noted as a parameter equivalent, though it lacks the early warning feature present in the ISL9440 series.
