ISL95808IRZ-T

ISL95808IRZ-T is an 8-channel, multi-rail buck regulator controller from Renesas Intersil. It is designed for advanced power-management applications (notebooks, high-end boards) that require multiple independent rails from a single input. The device provides eight regulator control channels, programmable output voltages and sequencing, and essential protection features for system reliability. It supports voltage monitoring and fault reporting, adjustable switching frequency, and protections such as over-current/short-circuit, over-voltage, and thermal protection. The controller is intended for use with external MOSFETs and passive components to form complete buck regulators for CPU cores, memory rails, and other loads. It comes in an IRZ package. For detailed electrical characteristics, pinout, and recommended applications, refer to the ISL95808 data sheet and designer’s guide.

Here are the typical features of the ISL95808IRZ-T (an 8‑phase multiphase buck controller for VRMs):
- 8-phase interleaved buck controller for multi-rail CPU/core VRMs
- Drives external N-channel MOSFETs (external FETs; no built‑in FETs)
- I2C/PMBus digital interface for voltage setpoints, sequencing, margining, and monitoring
- Programmable switching frequency with external clock synchronization
- Phase balancing and interleaving to reduce output ripple
- Programmable output voltages (VID/register-based) and sequencing
- Soft-start, ramp control, and power-good sequencing
- Protections: overcurrent/short-circuit, overvoltage, undervoltage, and thermal shutdown with fault latch
- Monitoring: output/input voltage, current sense, fault status/interrupts
- Optional features: spread-spectrum on/off, fault masking, alerts
- Package: IRZ-T (likely 28-pin TSSOP) suitable for VRM controller ICs
Note: exact register names and voltage ranges vary by revision; consult the datasheet for precise programming details.

- Pin count: 28 pins (ISL95808IRZ-T in the IRZ package)
- Function: Eight‑phase multiphase PWM voltage‑regulator controller for CPU core power. It generates gate-drive signals for external MOSFETs to implement a multi‑phase buck regulator and provides regulation and protection features (OV, UV, current limit, etc.).

- Manufacturer: Intersil (now part of Renesas Electronics Corporation)
- Company type: A Japanese multinational semiconductor company specializing in analog, mixed-signal, and power-management ICs and related semiconductor solutions.

ISL95808IRZ-T is an 8‑phase multiphase buck regulator controller. Typical applications include:
- Desktop/server CPU core and GPU core VRMs
- High‑performance ASICs and FPGAs requiring multiple rails
- Multi‑rail point‑of‑load (POL) supplies in servers, workstations, telecom and networking equipment
- Embedded computing platforms needing scalable, high‑current VRMs with external MOSFETs
It enables efficient, multi‑phase DC‑DC power delivery for demanding power‑line requirements.

ISL95808IRZ-T uses the IRZ package, a lead-free QFN with an exposed pad. The -T suffix indicates Tape & Reel packaging.