ISL68137IRAZ

ISL68137IRAZ is a multi-phase DC-DC buck regulator controller from Renesas/Intersil. It doesn’t supply power by itself; it drives external MOSFETs to implement a VRM for CPU/memory rails and other high-current loads. Key role is to generate stable, programmable output voltages with fast transient response by coordinating multiple interleaved phases.
Common features (as typical of this family) include:
- Multi-phase PWM control for improved efficiency and transient performance
- Programmable output voltage and switching frequency
- Soft-start and enable/disable control
- Cycle-by-cycle current limiting and various protections (OC/OVP/UVLO/thermal)
- Fault signaling and fault-handling logic
- Requires external MOSFETs, inductors, and feedback/network components
Applications: CPU/GPU core rails, server/workstation power modules, telecom/FPGA power stages.
Note: The IR AZ suffix denotes the specific packaging/ RoHS option. For exact specs (pinout, voltage range, current capability), consult the latest datasheet.

ISL68137IRAZ is a PMBus/I2C‑controlled multi-output buck regulator controller. Key features include:
- I2C/PMBus programmable control with readback of voltages, currents, and faults
- Up to four channels for multi-rail VRM applications with flexible phase interleaving
- Synchronous buck architecture with integrated gate drivers
- Programmable switching frequency with optional external clock synchronization
- Independent output voltages per channel; remote sense and load-line compensation
- Soft-start, voltage margining, sequencing, and enable control
- Comprehensive protection: overcurrent/short-circuit, over/undervoltage, thermal shutdown
- Fault/status reporting via PMBus/I2C and dedicated pins; latch/hiccup options
- Power-good signaling and fault isolation for reliable startup/shutdown
Optional features may include spread-spectrum operation and fault-safe modes depending on configuration.

- Pin count: 28 pins (28-pin package)
- Function: ISL68137IRAZ is a multi-phase buck regulator controller (VRM controller) that drives external MOSFETs to generate CPU voltage rails. It provides PWM control, feedback, soft-start, protections, and multi-phase operation for a synchronous buck converter.

- Manufacturer: Renesas Electronics Corporation (Intersil legacy product line; Renesas acquired Intersil in 2017).
- What kind of company: A Japanese multinational semiconductor company that designs and manufactures ICs, including analog/power management devices and microcontrollers, for automotive, industrial, and consumer markets.

ISL68137IRAZ is a high-performance, multiphase buck controller used for low-voltage VRMs. Typical applications:
- CPU/GPU core voltage regulation in desktops and servers
- Power delivery for FPGAs, ASICs, and memory
- Point-of-load (POL) DC-DC converters in data centers, telecom, and industrial equipment
- Desktop motherboard and graphics-card VRMs requiring high efficiency
- High-current multi-phase VRMs for embedded systems and custom power supplies

ISL68137IRAZ is in a 32-pin QFN package (5x5 mm) with an exposed pad; RoHS/lead-free compliant.