ISL85009FRZ-T

ISL85009FRZ-T is a high‑efficiency, synchronous buck regulator from Renesas Intersil. It integrates the power MOSFETs with a switching regulator controller to provide a complete DC‑DC solution for point‑of‑load rails (e.g., CPU/GPU cores, memory, PMIC rails) from a higher input supply. Key features typically include: integrated high/low‑side FETs, feedback‑driven output voltage (external resistor divider), current‑mode control, soft‑start and sequencing, optional remote sensing, and robust protection (UVLO, overcurrent/short‑circuit, over‑temperature, OVP). The FRZ‑T suffix denotes RoHS‑compliant, lead‑free, Tape‑and‑Reel packaging. It is designed to reduce board area and component count compared with discrete regulators and is suitable for compact VRM implementations in computing and other electronic systems. For exact electrical specs (input range, output voltage range, efficiency, timing), consult the official datasheet.

- Pin count: 28 pins (QFN FRZ package).
- Function: Dual synchronous buck regulator with integrated high-side/low-side FETs (two channels), I2C/SPI programmable control, used for CPU/core voltage regulation with sequencing and enable features.

Manufacturer: Renesas Electronics Corporation (Intersil brand).
What kind of company: A Japanese multinational semiconductor company specializing in analog and mixed-signal ICs, including power-management, interface, and other semiconductor products.

ISL85009FRZ-T is a multi-output PMBus-enabled DC-DC buck regulator for VRMs. Common application areas include:
- CPU/GPU core and memory voltage rails (desktops, laptops, servers)
- FPGA/ASIC power rails requiring tight regulation and low noise
- Multi-rail VRMs in servers, data centers, telecom and networking equipment
- Point-of-load regulators in embedded, industrial, and medical systems
- Power supplies for networking gear, storage arrays, and enterprise equipment
- Reference designs and evaluation boards for PMBus-controlled power sequencing

Package type: QFN-16 (4x4 mm), lead-free RoHS, Tape-and-Reel (ISL85009FRZ-T).