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Renesas ISL6261AIRZ
- Part No.:
- ISL6261AIRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6261AIRZ.pdf
- Description:
- IC REG CONV INTEL 1OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,511
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Product details
Overview
ISL6261AIRZ from Intersil is a single-phase buck regulator implementing Intel® IMVP-6® protocol with integrated 2A gate drivers, 7-bit VID DAC (0.300V–1.500V in 12.5mV steps), ±0.8% system voltage accuracy over –40°C to +100°C, and R3™ Robust Ripple Regulator modulator for fast transient response in mobile CPU core power delivery.
For engineers reviewing the ISL6261AIRZ datasheet, ISL6261AIRZ pinout, ISL6261AIRZ application, or ISL6261AIRZ equivalent, this page delivers verified specifications, validated operating modes (CCM/DEM/EDEM), confirmed DCR/resistive current sensing support, differential remote sensing at CPU die, and real-world power monitor (PMON) functionality for battery-aware thermal and power optimization.
Technical Context
The ISL6261AIRZ uses patented R3™ modulator architecture that synthesizes inductor ripple current internally and applies hysteretic comparison against error amplifier output-enabling variable switching frequency during transients (200–500 kHz range) while maintaining fixed-frequency-like stability and <0.8% voltage accuracy across 0.3V–1.5V VID range. It supports IMVP-6® load-line compliance via droop amplifier (DROOP–VO) and dual current sensing paths (lossless DCR with NTC thermal compensation or precision resistive).
Three operation modes-Continuous Conduction Mode (CCM), Diode Emulation Mode (DEM), and Enhanced DEM (EDEM)-are selected by DPRSTP#, DPRSLPVR, and FDE logic inputs per Table 2; EDEM increases VW-COMP voltage window by 40% to reduce light-load switching frequency and maximize efficiency in deeper sleep states without sacrificing transient recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.300V to 1.500V via 7-bit VID input; enables precise Intel IMVP-6® core voltage scaling in 12.5mV steps. |
| System Voltage Accuracy | ±0.8% over –40°C to +100°C at VID = 0.75V–1.5V; ensures stable CPU operation under thermal stress. |
| Switching Frequency | 200–500 kHz user-programmable via VW-to-COMP resistor; supports dynamic adjustment for efficiency vs. EMI trade-offs. |
| Gate Drive Capability | 2A source/sink for UGATE and LGATE; drives high-side and low-side MOSFETs directly without external drivers. |
| Power Monitor Output | PMON pin provides high-bandwidth analog voltage proportional to instantaneous CPU power (VPMON ≈ 35 × (VSEN–RTN) × (DROOP–VO)). |
| Current Sensing | Supports both lossless inductor DCR sensing (with NTC thermal compensation) and precision resistive sensing for accurate load-line implementation. |
| Operating Temperature | –40°C to +100°C ambient; qualified for industrial-grade mobile computing platforms including ultrabooks and embedded systems. |
Pinout & Package
ISL6261AIRZ is housed in a 40-lead 6×6 mm QFN package (Pb-free, RoHS compliant) with exposed thermal pad on bottom. Pin functions are validated per Intersil FN6354.2 datasheet Rev. 2 (Dec 2007).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID6 | 7-bit digital voltage identification input | LSB-to-MSB interface to CPU for dynamic core voltage selection per IMVP-6® VID table. |
| UGATE / LGATE | High-side / low-side MOSFET gate drive outputs | Integrated 2A drivers eliminate need for external gate buffers; support synchronous buck topology. |
| VSEN / RTN | Differential remote sense inputs | Enable true die-level voltage regulation by measuring CPU core voltage at point-of-load. |
| PMON | Analog power monitor output | Delivers real-time CPU power signal (up to ~3V) for system-level power budgeting and thermal management. |
| FDE | Forced diode emulation enable | Logic-high assertion with DPRSTP# low activates EDEM mode, reducing light-load switching frequency by 33%. |
| DPRSTP# / DPRSLPVR | IMVP-6® deep-sleep control inputs | Directly interface to CPU sleep-state signals to auto-select CCM/DEM/EDEM for optimal efficiency across workload states. |
| OCSET / DROOP / DFB | Overcurrent protection and droop amplifier network | Configurable trip threshold (via OCSET resistor) and precision load-line generation (DROOP–VO) for IMVP-6® compliance. |
| RBIAS | Internal current reference bias | 147 kΩ to VSS sets 10 µA reference for OCSET and thermal monitoring circuits. |
| VR_TT# | Open-drain thermal overload indicator | Active-low signal asserts when NTC voltage falls below 1.17V, indicating >125°C junction temperature. |
| PGOOD | Power-good status output | Open-drain signal pulled high externally; asserts after ~7 ms when VO settles within 20 mV of target. |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Robust Ripple Regulator modulator | Variable-frequency hysteretic control enables faster transient response than fixed-frequency PWM while retaining 0.8% DC accuracy. |
| Three adaptive operation modes (CCM/DEM/EDEM) | Automatically switches between continuous conduction, diode emulation, and enhanced diode emulation based on CPU sleep state signals. |
| Differential remote voltage sensing (VSEN/RTN) | Compensates for PCB IR drop to regulate voltage precisely at CPU die, meeting Intel IMVP-6® ±0.8% accuracy requirement. |
| Integrated power monitor (PMON) | Provides analog voltage proportional to instantaneous CPU power (VSEN × (DROOP–VO)), enabling real-time battery life optimization. |
| Thermal monitoring with NTC input (NTC/VR_TT#) | 60 µA current source drives thermistor network; VR_TT# pulls low when junction exceeds safe limit, triggering system thermal shutdown. |
| Programmable soft-start slew rate | SOFT capacitor value sets dv/dt: 2 mV/µs (deep sleep entry) or 10 mV/µs (active mode recovery), minimizing audible noise and overshoot. |
Applications
| Mobile CPU Core Power Supply | Ultrabook Platform Voltage Regulation |
|---|---|
Use Scenario: Powering Intel Pentium M/Core 2 Duo processors in thin-and-light notebooks requiring IMVP-6® compliance and battery runtime extension. IC Role / Device Role / Timing Role: Single-phase synchronous buck controller with integrated gate drivers, VID decoding, and load-line droop for CPU core rail. Use Value: Achieves >90% peak efficiency in CCM and >85% at 1A load in EDEM mode, extending battery life by up to 22 minutes in deeper sleep states. | Use Scenario: Regulating core voltage in fanless ultrabooks where thermal headroom is constrained and acoustic noise must be minimized. IC Role / Device Role / Timing Role: IMVP-6®-compliant regulator with programmable soft-start slew rate and differential remote sensing for die-level accuracy. Use Value: 2 mV/µs slow-slew deep-sleep transitions suppress coil whine; ±0.8% accuracy prevents CPU throttling under thermal stress. |
| Embedded Mobile Computing Systems | Industrial Tablet Power Management |
Use Scenario: Powering ARM/x86 SoCs in ruggedized tablets deployed in logistics, field service, and medical environments. IC Role / Device Role / Timing Role: High-reliability core regulator supporting –40°C to +100°C ambient operation with overvoltage, undervoltage, and overtemperature protection. Use Value: VR_TT# and PGOOD signals integrate directly into system health monitoring firmware; 125°C thermal shutdown protects silicon under sustained load. | Use Scenario: Managing CPU core power in sealed industrial tablets subject to wide ambient temperature swings and vibration. IC Role / Device Role / Timing Role: Dual-current-sensing-capable regulator (DCR + resistive) ensuring consistent load-line accuracy despite inductor aging or PCB trace resistance drift. Use Value: NTC-based DCR thermal compensation maintains ±1.5% load-line error over full temperature range, preventing premature CPU throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-phase IMVP-6® core regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6261ACRZ | Same architecture and pinout; rated for –10°C to +100°C ambient (vs. –40°C to +100°C for ISL6261AIRZ). | Not suitable for extended industrial or automotive-adjacent deployments requiring full –40°C start-up capability. | Select ISL6261ACRZ only for commercial-temperature applications where cost is prioritized over extended cold-temperature margin. |
| RT8802A | Single-phase IMVP-6® controller with 0.5% accuracy, but lacks integrated gate drivers-requires external high/low-side drivers. | Increases BOM count and layout complexity; no native PMON or thermal monitor outputs. | Choose RT8802A only if discrete driver selection is required for higher current (>30A) or custom gate timing control. |
Compared with ISL6261ACRZ, the ISL6261AIRZ extends operational reliability to –40°C ambient and adds robustness for industrial mobile designs; compared with RT8802A, it reduces system footprint and component count via integrated 2A drivers and delivers unique power-monitoring capability critical for battery-aware firmware.
Availability
ISL6261AIRZ is available at Aetrix Electronics and suitable for mobile CPU core power supplies, ultrabook platform voltage regulation, and industrial tablet power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL6261AIRZ 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 Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management IC designer known for high-performance voltage regulators, precision amplifiers, and interface solutions targeting computing, industrial, and communications markets.
The ISL6261AIRZ belongs to Intersil's IMVP-6®-compliant core regulator product line, engineered specifically for Intel mobile processor platforms requiring fast transient response, multi-mode efficiency optimization, and die-level voltage accuracy in space-constrained designs.
FAQ
What is the operating temperature range of the ISL6261AIRZ?
The ISL6261AIRZ is specified for –40°C to +100°C ambient temperature operation, with junction temperature rated up to +125°C. This extended range supports deployment in industrial mobile devices, ruggedized tablets, and ultrabooks exposed to wide environmental conditions-unlike the ISL6261ACRZ variant, which is limited to –10°C to +100°C. The device maintains ±0.8% system voltage accuracy across this full range when used with proper thermal design and PCB copper pour under the exposed pad.
How does the ISL6261AIRZ implement IMVP-6® load-line compliance?
The ISL6261AIRZ implements IMVP-6® load-line compliance using its internal droop amplifier, which generates a DROOP voltage referenced to VO. The difference (DROOP–VO) serves as a high-bandwidth analog representation of inductor current. This signal feeds both the error amplifier's DFB input for load-line regulation and the overcurrent protection circuit. When combined with either DCR or resistive current sensing-and NTC-based thermal compensation for DCR-the ISL6261AIRZ achieves the precise voltage droop vs. load current required by Intel's IMVP-6® specification.
Does the ISL6261AIRZ support both DCR and resistive current sensing?
Yes, the ISL6261AIRZ fully supports both lossless inductor DCR current sensing and precision resistive current sensing. For DCR sensing, the device uses the VSUM, DFB, and DROOP pins along with an external NTC thermistor network to compensate for copper winding resistance drift over temperature. For resistive sensing, a dedicated sense resistor is placed in series with the inductor, and the same droop amplifier structure applies. Both methods deliver identical load-line accuracy and overcurrent protection behavior, giving designers flexibility in cost, size, and thermal performance trade-offs.
What is the function of the PMON pin on the ISL6261AIRZ?
The PMON pin on the ISL6261AIRZ provides a high-bandwidth analog voltage output proportional to instantaneous CPU power consumption: VPMON ≈ 35 × (VSEN–RTN) × (DROOP–VO). Since (VSEN–RTN) equals core voltage and (DROOP–VO) equals inductor current, PMON delivers a real-time power signal usable by system firmware for dynamic thermal management, battery life estimation, and adaptive performance scaling-without requiring external ADCs or power meter ICs. Maximum output is ~3V, with sourcing/sinking capability of ±2 mA.
How does the ISL6261AIRZ transition between CCM, DEM, and EDEM modes?
The ISL6261AIRZ transitions between Continuous Conduction Mode (CCM), Diode Emulation Mode (DEM), and Enhanced DEM (EDEM) based on logic states of DPRSTP#, DPRSLPVR, and FDE pins per Table 2 in the datasheet. DPRSTP# low + DPRSLPVR high + FDE low enables DEM; adding FDE high activates EDEM (increasing VW-COMP window by 40%). Transitions require ≥3 consecutive PWM cycles above threshold and are debounced against glitches (<7 cycles ignored). Mode changes occur without interrupting regulation, and slew rates adapt automatically to minimize audible noise during deep-sleep entry/exit.
ISL6261AIRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Converter, Intel IMVP-6
- Voltage - Input:
- 5V ~ 21V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.3V ~ 1.5V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
ISL6261AIRZ FAQ
1.How can I place an order for ISL6261AIRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6261AIRZ 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 ISL6261AIRZ reliable?
The price and inventory of ISL6261AIRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6261AIRZ is usually 5 days.
3.What payment methods are accepted for ISL6261AIRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6261AIRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6261AIRZ?
ISL6261AIRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6261AIRZ 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 ISL6261AIRZ?
For technical support, including ISL6261AIRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6261AIRZ requirements.
6.How does Aetrix verify that ISL6261AIRZ is sourced from the original manufacturer or authorized distributors?
All ISL6261AIRZ 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 ISL6261AIRZ meets industry standards.
7.What is the process for return or replacement of ISL6261AIRZ?
All ISL6261AIRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6261AIRZ, 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 ISL6261AIRZ part is unused and in its original packaging.
Return procedure for ISL6261AIRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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