Renesas ISL6563CR

Overview

ISL6563CR from Intersil is a two-phase multiphase buck PWM controller with integrated MOSFET drivers, designed for precision voltage regulation in advanced microprocessors. It supports Intel VRM9/VRM10 and AMD Hammer VID codes, delivers ±1% system accuracy over temperature, and features r_DS(ON)-based current sensing for automatic channel balancing. It operates across 0°C to +70°C and targets high-current CPU core power delivery.

For engineers reviewing the ISL6563CR datasheet, ISL6563CR pinout, ISL6563CR application, or ISL6563CR equivalent, key selection criteria include phase-interleaved ripple reduction, programmable droop via single resistor, VID-on-the-fly capability, and integrated overvoltage/overcurrent protection with hiccup-mode recovery.

Technical Context

The ISL6563CR implements dual-channel interleaved PWM control with independent upper/lower gate drivers per phase, using a shared oscillator with 189–255 kHz per-channel switching frequency. Its error amplifier provides 96 dB DC gain and 20 MHz gain-bandwidth product to support fast transient response in microprocessor VRMs.

Current sensing is achieved via time-multiplexed r_DS(ON) sampling on PHASE1/PHASE2 pins, feeding ISEN to generate load-line droop and enable automatic channel current balancing. Overcurrent protection triggers at 95 µA sensed current, initiating 4096-cycle hiccup-mode recovery when both channels exceed threshold simultaneously or one channel exceeds it for seven consecutive cycles.

Key Specifications

Pinout & Package

ISL6563CR is housed in a 24-lead 4×4 mm QFN package (JEDEC MO-220, pkg drawing L24.4x4B), featuring an exposed thermal pad for enhanced heat transfer. The package is Pb-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiphase buck controller applications.

Compared with ISL6563CR, ISL6564CRZ offers scalable phase count for higher current but demands layout changes, while RT8802AGQW sacrifices r_DS(ON) integration and droop programmability for lower unit cost - making ISL6563CR optimal for balanced performance, density, and precision in mid-range CPU VRMs.

Availability

ISL6563CR is available at Aetrix Electronics and suitable for desktop CPU core power, laptop VRM design, server motherboard development, and embedded x86 system power requiring stable component supply and long-term industrial availability.

Supply support for ISL6563CR 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

Intersil (now part of Renesas Electronics) is a semiconductor company specializing in high-performance analog and power management ICs for computing, industrial, and communications markets.

The ISL6563CR belongs to Intersil's multiphase buck controller product line, engineered specifically for precision voltage regulation in microprocessor core power supplies with emphasis on VID compatibility, thermal efficiency, and protection robustness.

FAQ

What is the operating temperature range for the ISL6563CR?

The ISL6563CR is specified for commercial-grade operation from 0°C to +70°C ambient temperature. This range aligns with standard desktop and embedded computing environments where airflow and thermal management are controlled. The device's thermal resistance (θ_JA = 43°C/W) and maximum junction temperature of +150°C ensure reliable operation within this envelope when properly mounted on a thermally optimized PCB with adequate copper pour under the exposed pad.

Does the ISL6563CR support dynamic voltage scaling during processor operation?

Yes, the ISL6563CR supports dynamic VID (voltage identification on-the-fly) for real-time output voltage changes. In VRM9 or AMD Hammer modes, it validates new VID codes over 12 switching cycles and steps the reference in increments every four cycles. In VRM10 mode, it responds immediately upon validated code change - enabling sub-200 µs transitions such as 1.5 V to 1.7 V at 222 kHz switching frequency. This capability is essential for CPU frequency scaling without voltage overshoot.

How does the ISL6563CR implement current balancing between its two phases?

The ISL6563CR achieves automatic channel current balancing using time-multiplexed r_DS(ON) sensing on PHASE1 and PHASE2 pins. It samples the voltage across each lower MOSFET's r_DS(ON) during conduction, converts it to current via the ISEN resistor, and compares individual channel currents to the average. The resulting error adjusts each PWM comparator's duty cycle to force current matching - delivering ±3% balance without external components or calibration.

What protection features does the ISL6563CR provide against overvoltage events?

The ISL6563CR provides multi-tiered overvoltage protection (OVP): during normal operation, FB rising above VID + 200 mV triggers clamping by turning on both lower MOSFETs; when disabled, OVP thresholds are lowered to 1.65 V (Hammer/VRM10) or 1.95 V (VRM9) to protect pre-biased outputs. It also includes overcurrent protection with hiccup-mode recovery - disabling outputs for 4096 cycles after fault detection, then attempting soft-start until the condition clears.

Can the ISL6563CR be used with 12 V input supplies?

Yes, the ISL6563CR supports both 5 V and 12 V input conversion as stated in its datasheet headline features. Its gate drivers (UGATE/LGATE) and bootstrap circuitry are rated for absolute boot voltages up to PGND + 27 V and phase voltages from VBOOT − 7 V to VBOOT + 0.3 V, enabling robust operation with 12 V VIN. Designers must ensure PVCC and VCC remain at 5 V ±5%, and select MOSFETs with appropriate voltage ratings and gate thresholds for 12 V operation.