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Renesas ISL8101CRZ-T
- Part No.:
- ISL8101CRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ISL8101CRZ-T.pdf
- Description:
- IC REG CTRLR INTEL 1OUT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,292
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Product details
Overview
ISL8101CRZ-T from Intersil is a two-phase multiphase buck PWM controller with integrated MOSFET drivers, designed for precision voltage regulation in high-current microprocessor power supplies up to 80A. It supports Intel VRM9/VRM10 and AMD Hammer VID codes, delivers ±1% system accuracy over temperature, operates from 5V–12V input, and features rDS(ON)-based current sensing for channel balancing.
For engineers reviewing the ISL8101CRZ-T datasheet, ISL8101CRZ-T pinout, ISL8101CRZ-T application, or ISL8101CRZ-T equivalent, this controller enables fast transient recovery, pre-biased start-up, lossless current sampling, and multi-tiered overvoltage protection in space-constrained server and embedded computing power stages.
Technical Context
The ISL8101CRZ-T implements voltage-mode control with interleaved two-phase PWM operation at 189–255 kHz per channel, using out-of-phase sawtooth comparators and independent error amplifier outputs per phase. Its current balance loop samples lower MOSFET rDS(ON) voltage during conduction intervals and time-multiplexes signals across the ISEN pin to enforce matched channel currents.
Overvoltage protection includes dual thresholds: 1.65 V (Hammer/VRM10) or 1.95 V (VRM9) while disabled, and VID + 200 mV while enabled, with 100 mV hysteresis. The controller disables upper/lower gates on overcurrent detection-triggered by either both channels exceeding 95 µA simultaneously or one channel exceeding it for 7 consecutive cycles-and enters hiccup-mode recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Two-phase interleaved synchronous buck controller with integrated high- and low-side gate drivers |
| Input Voltage Range | 5 V to 12 V - powers CPU core rails from standard intermediate bus voltages |
| Output Accuracy | ±1% over temperature - ensures stable microprocessor supply within tight VRM tolerances |
| Switching Frequency | 189–255 kHz per phase - enables optimized magnetics sizing and ripple cancellation |
| VID Compatibility | Intel VRM9, VRM10, and AMD Hammer - supports dynamic voltage scaling for x86 and K8/K10 processors |
| Current Sensing | rDS(ON)-based, lossless - eliminates sense resistors and associated power loss in high-current paths |
| Protection Features | Multi-tier OVP, cycle-by-cycle OCP with hiccup recovery, and pre-biased soft-start - prevents damage during fault conditions and startup |
Pinout & Package
ISL8101CRZ-T is housed in a Pb-free, RoHS-compliant 24-lead QFN package (4 mm × 4 mm, JEDEC MO-220 L24.4x4B), with exposed thermal pad for enhanced heat dissipation in high-power density applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID4 | Voltage identification inputs | Decode 5-bit DAC code to set output voltage per VRM9/VRM10/Hammer tables; internally pulled up to 1.2 V |
| DACSEL/VID5 | DAC standard selection or 6th VID bit | Selects VRM9 (open/high), Hammer (grounded), or enables VRM10 6-bit mode (grounded + VRM10 pin grounded) |
| FB | Error amplifier inverting input | Connects to resistor divider from VOUT; sets regulation point via internal reference and VID DAC |
| COMP | Error amplifier output | Drives external compensation network; sinking >1 mA disables controller |
| ISEN | Current balance and OCP reference node | Resistor between ISEN and VCC sets trip threshold; senses time-multiplexed rDS(ON) voltage from both phases |
| UGATE1/UGATE2 | Upper MOSFET gate drive outputs | Drive high-side N-channel FETs; each limited to ≤67% duty cycle; 1–2.5 Ω source/sink resistance |
| LGATE1/LGATE2 | Lower MOSFET gate drive outputs | Drive low-side N-channel FETs; 0.4–1.0 Ω sink resistance enables fast turn-off for shoot-through prevention |
| PHASE1/PHASE2 | Half-bridge switching node inputs | Return path for UGATE drives; used as rDS(ON) sensing points for current feedback |
| BOOT1/BOOT2 | Bootstrap supply inputs | Charge external bootstrap capacitors via internal diodes connected to PVCC; enable high-side drive above input rail |
| VCC / PVCC | Bias and driver supply inputs | VCC powers logic (5 V ±5%); PVCC powers gate drivers (5 V); both monitored for POR at 4.4 V rising / 3.9 V falling |
| ENLL | Enable input with precision threshold | Active-high enable; ~0.6 V threshold ensures reliable startup sequencing in multi-rail systems |
| OFS | Adjustable output offset input | Connect ROFS to GND for positive offset or R′OFS to VCC for negative offset; fine-tunes VID-set voltage |
| SSEND | Soft-start end indicator | Open-drain output pulls low during soft-start; goes high-impedance when regulation is achieved |
| GND / PGND | Analog and power ground returns | GND references small-signal circuitry; PGND references LGATE drivers and PHASE nodes - must be short, low-inductance paths |
Key Features
| Feature | Design Value |
|---|---|
| Integrated two-phase control with interleaving | Reduces output ripple frequency by 2× and peak-to-peak amplitude by ~50%, enabling smaller output capacitors and inductors |
| rDS(ON)-based current sensing | Eliminates discrete current-sense resistors, saving PCB area and conduction losses in ≥60 A applications |
| Programmable VID DAC with three standards | Single IC supports legacy VRM9, modern VRM10, and AMD Hammer processors without hardware changes |
| Pre-biased output start-up | Allows safe power-up into already-biased loads (e.g., hot-swap or multi-rail sequencing), preventing reverse current flow |
| Multi-tier overvoltage protection | Clamps output via lower-FET turn-on during faults, with distinct thresholds for powered and unpowered states |
| Hiccup-mode overcurrent recovery | Disables both channels for 4096 clock cycles then attempts soft-start - protects MOSFETs and load during sustained overload |
Applications
| Server CPU Core Power | Embedded x86 Processor Supply |
|---|---|
|
Use Scenario: Dual-socket 2U rack server delivering up to 80A per CPU socket with dynamic voltage/frequency scaling. IC Role / Device Role / Timing Role: Two-phase buck controller regulating 0.8–1.85 V core voltage; synchronizes phase timing to minimize input/output ripple. Use Value: Enables use of smaller 0.47 µH inductors and fewer 22 µF ceramic output caps versus single-phase designs, reducing BOM cost by ~18%. |
Use Scenario: Industrial control unit with AMD Opteron-based SoC requiring precise, low-noise core voltage under variable thermal load. IC Role / Device Role / Timing Role: VRM10-compliant controller executing on-the-fly VID transitions in <200 µs; manages thermal derating via real-time current balance. Use Value: Maintains ±1% output accuracy across –40°C to +85°C ambient, eliminating need for external calibration in field-deployed units. |
| Network Switch ASIC Supply | High-Density FPGA Core Rail |
|
Use Scenario: 10G Ethernet switch line card powering multiple ASICs with fast load transients up to 50 A/µs. IC Role / Device Role / Timing Role: Fast-transient buck controller with 222 kHz switching and sub-100 ns gate drive rise/fall times for minimal response latency. Use Value: Achieves <100 mV output deviation during 40 A step load, meeting IEEE 802.3ap jitter and stability requirements. |
Use Scenario: Stratix V FPGA development platform requiring clean, sequenced 0.9 V core supply with programmable offset. IC Role / Device Role / Timing Role: Precision regulator with OFS pin enabling ±50 mV fine-tuning of VID-set voltage to match FPGA VCCINT tolerance bands. Use Value: Eliminates post-layout voltage trimming resistors, reducing design iterations and enabling single-BOM support for multiple FPGA speed grades. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6322IRZ-T | Three-phase capable, supports VRM11, adds digital interface (SMBus), higher max current (120 A), no rDS(ON) sensing (uses DCR) | Required for newer Intel CPUs with VRM11 compliance; needs external DCR network and SMBus host | Choose ISL6322IRZ-T only if upgrading to VRM11 or needing three-phase scalability; ISL8101CRZ-T remains optimal for cost-sensitive VRM9/VRM10 designs. |
| TPS53355DQPT | Single-chip two-phase controller with integrated MOSFETs (30 V, 40 A), fixed 500 kHz fSW, no VID support - uses analog voltage or PMBus | Targeted at compact DC/DC modules; lacks VID decoding, so incompatible with legacy microprocessor VID signaling | Use TPS53355DQPT for space-constrained board areas where integrated FETs reduce layout complexity, but not for VID-driven CPU supplies. |
Compared with ISL6322IRZ-T and TPS53355DQPT, the ISL8101CRZ-T uniquely balances VID compatibility, rDS(ON) sensing efficiency, and two-phase integration without requiring external communication interfaces or sacrificing flexibility for legacy processor support.
Availability
ISL8101CRZ-T is available at Aetrix Electronics and suitable for server CPU core power, embedded x86 processor supply, and high-density FPGA core rail applications requiring stable component supply and long-term industrial availability.
Supply support for ISL8101CRZ-T 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, communications, and industrial markets.
The ISL8101CRZ-T belongs to Intersil's multiphase buck controller product line, engineered specifically for high-current, low-voltage microprocessor and ASIC power delivery with emphasis on VID compatibility, thermal efficiency, and robust fault protection.
FAQ
What is the operating temperature range for the ISL8101CRZ-T?
The ISL8101CRZ-T is specified for commercial-grade operation from 0°C to +70°C ambient temperature. Its absolute maximum junction temperature is +150°C, and thermal resistance is θJA = 45°C/W in free air on a high-conductivity test board. This range aligns with typical server and embedded computing environments where airflow and heatsinking ensure reliable thermal performance for the ISL8101CRZ-T.
Does the ISL8101CRZ-T support dynamic VID changes during operation?
Yes, the ISL8101CRZ-T supports dynamic VID changes: in VRM9 or AMD Hammer modes, it detects new codes after 12 stable switching cycles and steps the output in increments every 4 cycles; in VRM10 mode, it validates changes after 3 readings and updates immediately. For example, a 1.5 V → 1.7 V transition in VRM9 at 222 kHz takes ~196 µs - a key capability for the ISL8101CRZ-T in CPU DVFS applications.
How does the ISL8101CRZ-T implement overcurrent protection?
The ISL8101CRZ-T uses rDS(ON) sensing on the lower MOSFETs to monitor channel current. An overcurrent event triggers if both channels exceed 95 µA simultaneously, or one channel exceeds it for 7 consecutive switching cycles. Upon detection, both upper and lower gates disable, and the ISL8101CRZ-T enters hiccup mode - waiting 4096 cycles before retrying soft-start - protecting downstream components without latch-off.
Can the ISL8101CRZ-T be used with non-VID microprocessors?
Yes - the ISL8101CRZ-T can operate in fixed-output mode by tying all VID pins to defined logic levels (e.g., VID0–VID4 = 00000 for 1.100 V in VRM9). The OFS pin further allows ±50 mV fine adjustment. While VID decoding is its primary interface, the ISL8101CRZ-T retains full regulation, current balancing, and protection functionality without active VID signaling.
What package type and lead finish does the ISL8101CRZ-T use?
The ISL8101CRZ-T uses a 24-lead QFN package (4 mm × 4 mm, JEDEC MO-220 L24.4x4B) with an exposed thermal pad. It features 100% matte tin (e3) lead finish, RoHS-compliant and compatible with both SnPb and Pb-free soldering processes. This package provides low thermal resistance (θJC = 7.5°C/W) and high PCB efficiency - critical for thermal management in the ISL8101CRZ-T's high-current applications.
ISL8101CRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, Intel VRM9, VRM10, AMD Hammer Applications
- Voltage - Input:
- 4.6V ~ 12V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.6V ~ 2.3V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
ISL8101CRZ-T FAQ
1.How can I place an order for ISL8101CRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8101CRZ-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL8101CRZ-T reliable?
The price and inventory of ISL8101CRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8101CRZ-T is usually 5 days.
3.What payment methods are accepted for ISL8101CRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8101CRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8101CRZ-T?
ISL8101CRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8101CRZ-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL8101CRZ-T?
For technical support, including ISL8101CRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8101CRZ-T requirements.
6.How does Aetrix verify that ISL8101CRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL8101CRZ-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL8101CRZ-T meets industry standards.
7.What is the process for return or replacement of ISL8101CRZ-T?
All ISL8101CRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL8101CRZ-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL8101CRZ-T part is unused and in its original packaging.
Return procedure for ISL8101CRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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