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Renesas ISL6261ACRZ
- Part No.:
- ISL6261ACRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6261ACRZ.pdf
- Description:
- IC REG CONV INTEL 1OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,060
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Product details
Overview
ISL6261ACRZ from Intersil is a single-phase IMVP-6® core voltage regulator IC with integrated 2A gate drivers, 7-bit VID DAC (0.300V–1.500V in 12.5mV steps), ±0.5% system voltage accuracy over temperature, and R3™ Robust Ripple Regulator modulator for fast transient response in mobile CPU power delivery.
For engineers reviewing the ISL6261ACRZ datasheet, ISL6261ACRZ pinout, ISL6261ACRZ application, or ISL6261ACRZ equivalent, this page delivers verified technical context, confirmed pin functions, real-world IMVP-6® operation modes (CCM/DEM/EDEM), differential remote sensing at CPU die, and power monitoring via PMON pin for battery-aware system optimization.
Technical Context
The ISL6261ACRZ implements Intel's IMVP-6® protocol with patented R3™ modulator architecture that synthesizes inductor ripple current internally and uses hysteretic comparators-enabling variable switching frequency during transients (200–500 kHz range) and faster load-step response than fixed-frequency PWM controllers. It supports both DCR-based and resistive current sensing with NTC thermal compensation for load-line accuracy.
Three operational modes-Continuous Conduction Mode (CCM), Diode Emulation Mode (DEM), and Enhanced Diode Emulation Mode (EDEM)-are selected via DPRSTP#, DPRSLPVR, and FDE logic inputs per Table 2. EDEM increases the VW-COMP voltage window by +40% to further reduce light-load switching frequency and maximize efficiency in CPU deeper sleep states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Type | Single-phase buck controller with integrated high- and low-side gate drivers (2A sink/source) |
| Output Voltage Range | 0.300V to 1.500V via 7-bit VID input; 12.5mV step resolution; supports IMVP-6® VID table including 0.000V shutdown state |
| Voltage Accuracy | ±0.5% over temperature (0°C to +100°C) for VID = 0.75V–1.5V; enables precise core voltage regulation per IMVP-6® spec |
| Switching Frequency | Adjustable 200–500 kHz via external resistor on VW pin; nominal 333 kHz at RFSET = 7kΩ |
| Power Monitor Output | PMON pin provides high-bandwidth analog voltage proportional to instantaneous CPU power: VPMON = 35 × (VSEN−RTN) × (DROOP−VO) |
| Protection Features | Overvoltage (155–235 mV trip, 1.7V severe), undervoltage (−300 mV), overcurrent (120 µs delay), overtemperature (NTC < 1.18V), and PGOOD latching |
| Remote Sensing | Differential amplifier (VDIFF, VSEN, RTN) enables accurate voltage regulation directly at CPU die; eliminates PCB trace IR drop error |
Pinout & Package
ISL6261ACRZ is housed in a 40-lead, 6 mm × 6 mm QFN package with exposed thermal pad (PKG DWG L40.6x6). 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; sets output voltage per IMVP-6® VID table (e.g., [1100000] = 0.300V) |
| UGATE / LGATE | High-side and low-side MOSFET gate drive outputs | Integrated 2A drivers enable direct connection to external power stage; UGATE drives upper FET, LGATE drives lower FET |
| VSEN / RTN | Differential remote sense inputs | Connect to CPU die VCC/VSS pins to regulate voltage precisely at point-of-load; rejects PCB trace resistance error |
| PMON | Analog power monitor output | Delivers real-time CPU power signal (up to ~3V) for dynamic power management and battery runtime optimization |
| FDE | Forced diode emulation enable | Logic-high with DPRSTP# low forces EDEM mode, widening VW-COMP window by +40% to reduce light-load switching frequency |
| DPRSTP# / DPRSLPVR | CPU deeper-sleep control inputs | Directly interface to Intel IMVP-6® processor signals to auto-select CCM/DEM/EDEM based on CPU activity state |
| SOFT | Soft-start ramp control | Capacitor to GND sets slew rate: 2 mV/µs (DPRSLPVR = 1) or 10 mV/µs (DPRSLPVR = 0) for noise-controlled transitions |
| OCSET / DROOP / DFB | Overcurrent protection network | Resistor from OCSET to VO sets DROOP voltage limit; DROOP−VO is high-bandwidth current representation used for OC trip |
Key Features
| Feature | Design Value |
|---|---|
| R3™ Robust Ripple Regulator modulator | Enables variable-frequency transient response-increasing fSW under load step to deliver energy faster, decreasing fSW under unload for higher light-load efficiency |
| Three adaptive operation modes (CCM/DEM/EDEM) | Automatically switches between continuous conduction, diode emulation, and enhanced diode emulation based on CPU sleep signals-extending battery life without firmware intervention |
| True differential remote voltage sensing | Compensates for PCB trace IR drop by regulating directly at CPU die; maintains ±0.5% accuracy across full VID range and temperature |
| Integrated power monitor (PMON) | Provides analog voltage proportional to instantaneous CPU power (VPMON = 35×Vcore×Iinductor), enabling real-time power budgeting and thermal throttling decisions |
| DCR current sensing with NTC compensation | Uses inductor's intrinsic resistance for lossless current measurement; NTC thermistor network corrects for copper winding temperature drift-preserving IMVP-6® load-line accuracy |
Applications
| Mobile CPU Core Power Delivery | Laptop Platform Voltage Regulation |
|---|---|
Use Scenario: Powering Intel Pentium M and Core Solo/Duo processors in ultra-thin notebooks requiring IMVP-6® compliance and aggressive battery life optimization. IC Role / Device Role / Timing Role: Single-phase core regulator implementing IMVP-6® protocol with integrated gate drivers, VID decoding, and dynamic mode switching. Use Value: Enables >90% peak efficiency across 0–25A load range; EDEM mode reduces light-load quiescent current by lowering switching frequency during CPU deep sleep. | Use Scenario: Regulating VCC_CORE in dual-voltage laptop motherboards where discrete VRMs must meet Intel's mobile voltage positioning requirements. IC Role / Device Role / Timing Role: Primary core voltage controller with differential remote sensing, programmable soft-start, and PGOOD sequencing for system power management unit (PMU) coordination. Use Value: ±0.5% voltage accuracy ensures stable CPU operation across temperature; PMON output feeds system-level power budgeting algorithms to extend runtime. |
| IMVP-6® Reference Design Implementation | Battery-Powered Embedded x86 Systems |
Use Scenario: Building reference designs compliant with Intel IMVP-6® specification for OEM validation and platform bring-up. IC Role / Device Role / Timing Role: Fully featured IMVP-6® controller supporting both DCR and resistive current sensing, thermal monitoring (VR_TT#), and clock enable (CLK_EN#) generation. Use Value: Reduces design risk with production-proven architecture; CLK_EN# asserts 13 cycles after Vcore reaches boot voltage-synchronizing system PLL startup. | Use Scenario: Powering fanless embedded x86 modules (e.g., Intel Atom E3800 series) in industrial HMIs and portable medical devices. IC Role / Device Role / Timing Role: Core regulator with overtemperature (NTC), overvoltage, and undervoltage protection-meeting IEC 60601-1 safety margins. Use Value: VR_TT# open-drain output pulls down at NTC < 1.18V, triggering system thermal shutdown before junction exceeds 125°C. |
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 |
|---|---|---|---|
| ISL6261AIRZ | Wider ambient temperature range (−40°C to +100°C vs. −10°C to +100°C); same electrical specs and pinout | Required for extended-temperature industrial or automotive-adjacent deployments where cold-start reliability below −10°C is critical | Select ISL6261AIRZ when operating below −10°C; otherwise ISL6261ACRZ is cost-optimized for commercial laptop use. |
| RT8802A | Supports IMVP-6.5/7 protocols; adds VR-ready signaling and enhanced telemetry; no integrated NTC compensation circuitry | Used in newer platforms requiring backward-compatible IMVP-6 support plus future-proofing for IMVP-7 voltage scaling | Choose RT8802A only if upgrading to IMVP-6.5+ ecosystems; ISL6261ACRZ remains optimal for pure IMVP-6® designs. |
Compared with ISL6261AIRZ, the ISL6261ACRZ trades −40°C capability for lower cost in consumer laptop applications; compared with RT8802A, it lacks IMVP-6.5 extensions but delivers proven, simpler implementation with built-in NTC compensation for DCR sensing accuracy.
Availability
ISL6261ACRZ is available at Aetrix Electronics and suitable for mobile CPU core power delivery, laptop platform voltage regulation, and IMVP-6® reference design implementation requiring stable component supply and long-term lifecycle support.
Supply support for ISL6261ACRZ 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 DC/DC controllers, precision references, and robust power solutions.
The ISL6261ACRZ belongs to Intersil's IMVP-6®-compliant core regulator product line, engineered specifically for Intel mobile CPU voltage positioning requirements-including fast transient response, multi-mode efficiency optimization, and differential remote sensing.
FAQ
What is the operating temperature range for the ISL6261ACRZ?
The ISL6261ACRZ is specified for an ambient temperature range of −10°C to +100°C, with junction temperature rated up to +125°C. This range aligns with commercial laptop thermal envelopes. For extended-temperature applications, the ISL6261AIRZ variant supports −40°C to +100°C ambient operation while maintaining identical electrical performance and pin compatibility with the ISL6261ACRZ.
How does the ISL6261ACRZ implement IMVP-6® load-line regulation?
The ISL6261ACRZ achieves IMVP-6® load-line compliance using its droop amplifier: DROOP−VO voltage represents inductor current, which is fed into a differential amplifier with VSEN−RTN (core voltage). This creates a controlled voltage droop proportional to load current. When combined with DCR or resistive current sensing-and NTC compensation for thermal drift-the ISL6261ACRZ maintains tight load-line accuracy across temperature, as required by the IMVP-6® specification.
What is the function of the PMON pin on the ISL6261ACRZ?
The PMON pin on the ISL6261ACRZ outputs a high-bandwidth analog voltage (VPMON) proportional to instantaneous CPU power: VPMON = 35 × (VSEN−RTN) × (DROOP−VO). Since VSEN−RTN equals core voltage and DROOP−VO equals inductor current, PMON delivers real-time power data for system-level power budgeting, thermal management, and battery runtime optimization-without requiring external ADCs or computation.
Can the ISL6261ACRZ be used with both DCR and resistive current sensing?
Yes, the ISL6261ACRZ supports both lossless inductor DCR current sensing and precision resistive current sensing. For DCR sensing, the NTC pin connects to a thermistor network that compensates for copper winding resistance drift with temperature-preserving load-line accuracy. For resistive sensing, a precision shunt resistor is placed in series with the inductor, and the ISL6261ACRZ's internal circuitry interprets the resulting voltage drop identically, enabling flexible board-level design choices.
What protection features does the ISL6261ACRZ include?
The ISL6261ACRZ integrates comprehensive protection: overvoltage (155–235 mV above setpoint, plus 1.7V severe trip), undervoltage (−300 mV), overcurrent (120 µs delay), overtemperature (via NTC input, pulling VR_TT# low), and PGOOD latching. Fault recovery requires toggling VR_ON or VDD. These protections ensure safe operation in mobile platforms where thermal and electrical stress are common during battery discharge or transient events.
ISL6261ACRZ 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:
- -10°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
ISL6261ACRZ FAQ
1.How can I place an order for ISL6261ACRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6261ACRZ 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 ISL6261ACRZ reliable?
The price and inventory of ISL6261ACRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6261ACRZ is usually 5 days.
3.What payment methods are accepted for ISL6261ACRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6261ACRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6261ACRZ?
ISL6261ACRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6261ACRZ 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 ISL6261ACRZ?
For technical support, including ISL6261ACRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6261ACRZ requirements.
6.How does Aetrix verify that ISL6261ACRZ is sourced from the original manufacturer or authorized distributors?
All ISL6261ACRZ 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 ISL6261ACRZ meets industry standards.
7.What is the process for return or replacement of ISL6261ACRZ?
All ISL6261ACRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6261ACRZ, 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 ISL6261ACRZ part is unused and in its original packaging.
Return procedure for ISL6261ACRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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