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Renesas ISL6261AIRZ-T
- Part No.:
- ISL6261AIRZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6261AIRZ-T.pdf
- Description:
- IC REG CONV INTEL 1OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,449
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Product details
Overview
ISL6261AIRZ-T 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-T datasheet, ISL6261AIRZ-T pinout, ISL6261AIRZ-T application, or ISL6261AIRZ-T equivalent, key selection considerations include IMVP-6® compliance, DCR/resistive current sensing support, three-mode operation (CCM/DEM/EDEM), thermal monitoring via NTC input, and power monitoring via PMON analog output.
Technical Context
The ISL6261AIRZ-T uses Intersil's patented R3™ modulator, which synthesizes inductor ripple current internally and applies hysteretic control relative to the error amplifier output-enabling variable switching frequency during transients (200–500 kHz range) and faster load-step response than fixed-frequency PWM. It supports Intel IMVP-6® dynamic voltage positioning with precise load-line regulation via droop amplifier and DROOP-VO feedback.
Operation mode selection (CCM, Diode Emulation Mode, Enhanced DEM) is determined by DPRSTP#, DPRSLPVR, and FDE logic inputs per Table 2, enabling efficiency optimization across CPU active, light-load, and deeper sleep states. Current sensing is implemented either through lossless inductor DCR (with NTC thermal compensation) or precision resistive sensing, both feeding VSUM and DROOP pins for real-time current representation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range | 0.300V to 1.500V output via 7-bit VID; supports IMVP-6® dynamic scaling with 12.5mV steps. |
| System Accuracy | ±0.8% over –40°C to +100°C at VID = 0.75–1.5V; enables tight core voltage regulation for Pentium-class mobile CPUs. |
| Switching Frequency | 200–500 kHz user-programmable via VW–COMP resistor; R3™ modulator increases frequency during load transients for faster recovery. |
| Gate Drive | Integrated 2A UGATE/LGATE drivers with <1.5Ω source/sink resistance; eliminates need for external drivers in ≤25A applications. |
| Current Sensing | Supports both DCR-based (NTC-compensated) and resistive sensing; DROOP-VO provides high-bandwidth analog current signal. |
| Power Monitor | PMON pin outputs VPMON = 35×(VSEN–RTN)×(DROOP–VO); delivers instantaneous CPU power as analog voltage (0.3–3.0V range). |
| Thermal Protection | NTC input with 60µA current source; VR_TT# open-drain fault indicator asserts when V(NTC) falls below 1.17–1.25V (≈125°C junction). |
Pinout & Package
ISL6261AIRZ-T is housed in a 40-lead 6×6 mm QFN package (Pb-free, exposed thermal pad) with 0.5 mm pitch. Pin functions are validated per FN6354.2 datasheet Rev. 2 (Dec 2007).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID6 | Digital voltage identification inputs | 7-bit LSB-to-MSB interface to CPU; sets output voltage per IMVP-6® VID table (e.g., [1100000] = 0.300V). |
| UGATE / LGATE | High-side / low-side MOSFET gate drivers | Direct drive of external N-channel MOSFETs; 2A peak sink/source capability minimizes external component count. |
| VSEN / RTN | Differential remote sense inputs | Connects to CPU die pads to regulate voltage at point-of-load; enables ±0.5% closed-loop accuracy at die. |
| PMON | Analog power monitor output | Delivers real-time CPU power (VPMON ∝ Vcore × Iinductor); used by system firmware for battery life optimization. |
| FDE / DPRSLPVR / DPRSTP# | IMVP-6® mode control inputs | Configure CCM/DEM/EDEM operation per CPU sleep state; FDE = 1 + DPRSTP# = 0 enables Enhanced Diode Emulation. |
| RBIAS | Internal current reference setting | 147kΩ to VSS sets 10µA OCSET reference and bias currents; critical for accurate overcurrent threshold calibration. |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Robust Ripple Regulator | Variable-frequency hysteretic-PWM hybrid architecture delivers faster transient response than fixed-frequency controllers without sacrificing steady-state ripple or accuracy. |
| Three-Mode Efficiency Optimization | Automatic transition between Continuous Conduction (CCM), Diode Emulation (DEM), and Enhanced DEM (EDEM) maximizes light-load efficiency in CPU sleep states. |
| Thermally Compensated DCR Sensing | NTC network on NTC pin dynamically adjusts gain/time constant to offset copper winding resistance drift, maintaining IMVP-6® load-line accuracy over temperature. |
| Integrated Power Monitoring | PMON analog output enables host system to track instantaneous CPU power consumption without external ADC or computation. |
| IMVP-6® Protocol Compliance | Fully implements Intel's Mobile Voltage Positioning specification including VID slew rates, DPRSTP#/DPRSLPVR timing, and power-good sequencing per Figure 4. |
Applications
| Mobile CPU Core Regulation | Laptop Platform Power Management |
|---|---|
Use Scenario: Regulating core voltage for Intel Pentium M and Core Solo/Duo processors in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary single-phase IMVP-6® buck controller managing up to 25A load with dynamic VID updates and deep-sleep mode transitions. Use Value: Enables >90% efficiency at light load via EDEM mode and maintains ±0.8% voltage accuracy across –40°C to +100°C ambient. | Use Scenario: System-level power coordination in dual-core laptop platforms with independent CPU/GPU rail control. IC Role / Device Role / Timing Role: Core voltage regulator providing PGOOD, CLK_EN#, and PMON signals to chipset and EC firmware for coordinated power state management. Use Value: PMON analog output allows real-time battery run-time estimation; CLK_EN# synchronization ensures PLL lock before CPU wake. |
| IMVP-6® Reference Design Implementation | Thermally Adaptive Notebook Power |
Use Scenario: Building validated IMVP-6® compliant power stages using Figures 2 and 3 application circuits. IC Role / Device Role / Timing Role: Drop-in controller supporting both DCR and resistive current sensing topologies with identical pinout and layout footprint. Use Value: Reduces design cycle time with pre-characterized startup timing (7ms PGOOD assertion), soft-start ramp control (SOFT pin), and fault reset logic. | Use Scenario: Maintaining stable core voltage under varying thermal conditions in fanless or thermally constrained designs. IC Role / Device Role / Timing Role: Thermal monitor via NTC input triggers VR_TT# shutdown before CPU thermal throttle; DCR sensing compensates for inductor heating. Use Value: Prevents thermal runaway by coupling NTC voltage threshold (1.17–1.25V) to VR_TT# fault, while DCR compensation preserves load-line accuracy across 85°C ΔT. |
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-T | Same silicon, but rated for –10°C to +100°C ambient; 0.5% system accuracy vs. ISL6261AIRZ-T's 0.8%. | Targeted at commercial-temperature laptops; not qualified for extended industrial or automotive ambient ranges. | Select ISL6261ACRZ-T only if operating ambient stays above –10°C; ISL6261AIRZ-T required for full –40°C cold-start capability. |
| RT8205AZQW | Single-phase IMVP-6® controller with integrated 3A drivers; no R3™ modulator-uses conventional fixed-frequency PWM with adaptive dead-time. | Lacks variable-frequency transient boost and PMON analog power output; requires external current-sense amplifier for DCR sensing. | Choose RT8205AZQW only if R3™ performance is unnecessary and cost reduction outweighs loss of power-monitoring capability. |
Compared with ISL6261ACRZ-T and RT8205AZQW, the ISL6261AIRZ-T uniquely combines –40°C operational rating, R3™ fast-transient architecture, and integrated PMON power telemetry-making it the only option for thermally demanding, battery-sensitive IMVP-6® designs requiring real-time power visibility.
Availability
ISL6261AIRZ-T is available at Aetrix Electronics and suitable for mobile CPU core regulation, laptop platform power management, and IMVP-6® reference design implementation requiring stable component supply across industrial temperature ranges.
Supply support for ISL6261AIRZ-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 precision analog and power management ICs for computing, industrial, and communications markets.
The ISL6261AIRZ-T belongs to Intersil's IMVP-6®-compliant core regulator product line, designed specifically to deliver high-efficiency, tightly regulated power to Intel mobile microprocessors while supporting dynamic voltage scaling and deep-sleep power states.
FAQ
What is the operating temperature range of the ISL6261AIRZ-T?
The ISL6261AIRZ-T is specified for an ambient operating temperature range of –40°C to +100°C, with junction temperature limits up to +125°C. This extended range supports reliable operation in thermally demanding laptop chassis and industrial mobile platforms where cold-start and sustained high-temperature performance are critical. The ISL6261AIRZ-T's ±0.8% system accuracy is guaranteed across this full range when used with proper PCB thermal design and NTC compensation.
How does the ISL6261AIRZ-T implement IMVP-6® dynamic voltage positioning?
The ISL6261AIRZ-T implements IMVP-6® dynamic voltage positioning through its 7-bit VID interface (VID0–VID6), differential remote sensing (VSEN/RTN), and programmable droop amplifier. It regulates output voltage to match Intel's VID table (Table 1), applies load-line droop proportional to sensed current (DROOP–VO), and sequences mode transitions (CCM→DEM→EDEM) using DPRSTP#, DPRSLPVR, and FDE inputs-all per IMVP-6® timing requirements. The ISL6261AIRZ-T achieves this with ±0.8% accuracy over temperature.
What current sensing methods does the ISL6261AIRZ-T support?
The ISL6261AIRZ-T supports two validated current sensing methods: lossless inductor DCR sensing (using VSUM, DROOP, and NTC pins with external RC network) and precision resistive sensing (using a series sense resistor and VSUM/DFB inputs). Both methods feed the droop amplifier to generate DROOP–VO-a high-bandwidth analog current signal used for load-line regulation and overcurrent protection. DCR sensing includes NTC-based thermal compensation to maintain accuracy across temperature.
What is the function of the PMON pin on the ISL6261AIRZ-T?
The PMON pin on the ISL6261AIRZ-T provides an analog voltage output (VPMON) proportional to instantaneous CPU power: VPMON = 35 × (VSEN – RTN) × (DROOP – VO). This high-bandwidth signal (0.3–3.0V range) represents real-time core power consumption-including switching ripple-and is used by system firmware for battery life optimization, thermal throttling decisions, and power budgeting. No external components are required to use PMON functionality in the ISL6261AIRZ-T.
Does the ISL6261AIRZ-T require external gate drivers?
No, the ISL6261AIRZ-T integrates 2A peak-source/2A peak-sink gate drivers for both high-side (UGATE) and low-side (LGATE) MOSFETs, eliminating the need for external drivers in ≤25A applications. Its UGATE/LGATE outputs drive standard N-channel MOSFETs directly, with typical turn-on propagation delays of 18–30 ns (UGATE) and 5–15 ns (LGATE) at 5V VDD. The internal drivers reduce BOM count, layout area, and gate-drive loop inductance versus discrete driver solutions.
ISL6261AIRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-T FAQ
1.How can I place an order for ISL6261AIRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6261AIRZ-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 ISL6261AIRZ-T reliable?
The price and inventory of ISL6261AIRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6261AIRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6261AIRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6261AIRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6261AIRZ-T?
ISL6261AIRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6261AIRZ-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 ISL6261AIRZ-T?
For technical support, including ISL6261AIRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6261AIRZ-T requirements.
6.How does Aetrix verify that ISL6261AIRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6261AIRZ-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 ISL6261AIRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6261AIRZ-T?
All ISL6261AIRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6261AIRZ-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 ISL6261AIRZ-T part is unused and in its original packaging.
Return procedure for ISL6261AIRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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