Renesas ISL99227FRZ-TS2791

Overview

ISL99227FRZ-TS2791 from Renesas Electronics is a Smart Power Stage (SPS) module integrating high-side and low-side MOSFETs, gate drivers, current/temperature monitors, and fault protection for multiphase VRMs. It delivers 60A DC output, supports 4.5V–18V input, features ±3% current monitoring accuracy with REFIN input, 8mV/°C temperature sensing, and operates up to 2MHz switching frequency in server CPU core voltage regulation.

For engineers reviewing the ISL99227FRZ-TS2791 datasheet, ISL99227FRZ-TS2791 pinout, ISL99227FRZ-TS2791 application, or ISL99227FRZ-TS2791 equivalent, key selection considerations include its 3.3V-compatible tri-state PWM interface, integrated downslope current sensing eliminating DCR networks, thermal-aware fault reporting via TMON/FAULT#, and compatibility with ISL68xxx/69xxx digital multiphase controllers.

Technical Context

The ISL99227FRZ-TS2791 implements a synchronous buck power stage with integrated 3.84mΩ high-side and 0.76mΩ low-side MOSFETs, driven by optimized GH/GL gate drivers featuring shoot-through protection, programmable dead time, and bootstrap diode emulation via internal NFET. Its tri-state PWM input enables controller-initiated safe shutdown during faults or phase shedding.

Current sensing uses downslope sampling of low-side FET conduction with 160ns blanking time and ±3% gain accuracy across –40°C to +125°C; temperature monitoring provides linear 8mV/°C output referenced to 0.6V at 0°C, with over-temperature latching at +140°C and hysteresis of 15°C. Fault reporting combines open-drain FAULT# with analog IMON and TMON outputs for real-time system-level coordination.

Key Specifications

Pinout & Package

ISL99227FRZ-TS2791 is housed in a RoHS-compliant 32-lead 5×5 mm PQFN Double Cooling package with exposed thermal pad (PKG DWG L32.5x5V), supporting high-current routing and efficient heat transfer to PCB ground plane via multiple vias under GND and VIN pads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Smart Power Stage applications.

Compared with ISL99227BFRZ-T, ISL99227FRZ-TS2791 enables tighter timing margins and lower gate drive losses in 3.3V-controller systems; compared with ISL99140IRZ-T, it eliminates four external components (sense resistor, temp sensor, OCP comparator, fault logic) while adding ±3% current accuracy and thermal bus capability.

Availability

ISL99227FRZ-TS2791 is available at Aetrix Electronics and suitable for server CPU core VRMs, GPU memory regulators, and cloud networking POL converters requiring stable component supply, full lifecycle support, and traceable sourcing for high-reliability deployments.

Supply support for ISL99227FRZ-TS2791 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power management, and SoC solutions for automotive, industrial, and datacenter applications.

The ISL99227FRZ-TS2791 belongs to Renesas' Smart Power Stage family, engineered specifically for high-efficiency, high-density multiphase VRMs in next-generation servers, AI accelerators, and networking infrastructure where integrated telemetry and robust fault handling are critical.

FAQ

What is the maximum continuous current rating of the ISL99227FRZ-TS2791?

The ISL99227FRZ-TS2791 is rated for 60A DC continuous output current under recommended operating conditions (TJ ≤ +125°C, θJA = 10.7°C/W). This rating assumes proper PCB thermal design with adequate copper area and via count under the 5×5 mm PQFN package. Peak current capability reaches 150A for short durations, limited by instantaneous power dissipation (100W max).

Does the ISL99227FRZ-TS2791 support 5V PWM input signals?

No, the ISL99227FRZ-TS2791 supports only 3.3V-compatible tri-state PWM input. Its input thresholds (1.3–1.8V tri-state window) and impedance (33.5kΩ sink / 16.5kΩ source) are optimized for 3.3V logic levels used by ISL68xxx/69xxx controllers. For 5V PWM compatibility, use ISL99227BFRZ-T instead - the two parts are not interchangeable due to differing input circuitry and timing specifications.

How does the ISL99227FRZ-TS2791 implement current monitoring without a sense resistor?

The ISL99227FRZ-TS2791 performs downslope current sensing on the low-side FET during conduction, using internal circuitry to generate an IMON output proportional to IL. It references an external REFIN voltage (0.8–1.6V) and achieves ±3% accuracy across –40°C to +125°C without requiring DCR sensing or external resistors. The IMON signal is valid after the first GL transition post-POR and includes 160ns blanking time to reject switching noise.

What fault conditions cause the FAULT# pin to assert low on the ISL99227FRZ-TS2791?

The FAULT# pin on the ISL99227FRZ-TS2791 asserts low for five distinct fault conditions: VCC undervoltage lockout (UVLO), VIN UVLO, overtemperature (>+140°C), HFET overcurrent (>90A), and HFET short (SW >100mV during GL high). All faults pull FAULT# low simultaneously; the pin remains asserted until all fault conditions clear and POR reinitializes the device - except for overtemperature, which clears automatically when TJ drops below +125°C.

Can multiple ISL99227FRZ-TS2791 devices share a common TMON bus?

Yes, the TMON pins of multiple ISL99227FRZ-TS2791 devices can be wired together as a common bus. Each TMON output has an internal open-drain structure that pulls high to 2.5V during overtemperature, and the highest voltage (i.e., hottest device) dominates the bus. This allows a single controller ADC input to monitor the worst-case temperature across all phases without additional multiplexing or sensing circuitry.