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Renesas ISL95837IRZ
- Part No.:
- ISL95837IRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL95837IRZ.pdf
- Description:
- IC REG CONV INTEL 2OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:598
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Product details
Overview
ISL95837IRZ from Renesas (formerly Intersil) is a dual-output, 1+1 phase voltage regulator IC designed for IMVP-7/VR12™ CPU core power delivery. It integrates two independent 1-phase VR controllers with shared serial control bus, supports DCR/resistor current sensing, differential remote sensing, and delivers 0.5% system accuracy over temperature. Used in high-efficiency notebook and desktop CPU VRMs.
For engineers reviewing the ISL95837IRZ datasheet, ISL95837IRZ pinout, ISL95837IRZ application, or ISL95837IRZ equivalent, key selection criteria include IMVP-7/VR12™ compliance, dual 1-phase configuration, programmable VBOOT/IMAX/TMAX, adaptive body diode conduction control, and R3™ ripple-regulator transient response.
Technical Context
The ISL95837IRZ implements Intersil's Robust Ripple Regulator (R3™) PWM architecture, enabling variable switching frequency during load transients and faster transient settling versus conventional fixed-frequency modulators. It uses a shared SMBus-compatible serial control interface to communicate with the CPU for VID code updates and telemetry reporting.
Both outputs support lossless DCR current sensing with single NTC thermistor compensation or precision resistor-based sensing, and each includes independent remote voltage sense, programmable IMAX/TMAX thresholds, adjustable switching frequency, overcurrent protection, and dedicated Power-Good signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Type | Dual 1-phase VR controller for IMVP-7/VR12™ CPU core power |
| System Accuracy | ±0.5% over temperature - ensures tight VOUT regulation across thermal operating range |
| Current Sensing | DCR or resistor-based, with single NTC for DCR temp compensation - enables accurate, lossless phase current monitoring |
| Voltage Sensing | Differential remote sense on both outputs - rejects PCB IR drop for precise load-point regulation |
| Control Interface | SMBus-compatible serial bus - reduces component count vs. dual-chip solution and enables CPU telemetry exchange |
| Startup Control | Programmable VBOOT voltage - prevents inrush-induced gate oxide stress during boot-up |
| Protection | OC protection per output + separate Power-Good signals - supports independent VR fault detection and system sequencing |
Pinout & Package
ISL95837IRZ is housed in a 48-pin QFN package (7mm × 7mm, 0.5mm pitch) with exposed thermal pad. Pin assignment is validated per Intersil FN7671 Rev 1.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 | Input power supply pins | Accept 5V–24V input for respective VR channels; require local bulk and ceramic decoupling |
| VOUT1_SENSE+, VOUT1_SENSE− VOUT2_SENSE+, VOUT2_SENSE− | Differential remote sense inputs | Enable Kelvin connection to CPU VDD/VDDIO pads for accurate load-line regulation |
| SMBCLK, SMBDAT | Serial bus interface | Shared bidirectional SMBus interface for VID programming, telemetry readback, and fault reporting |
| PGOOD1, PGOOD2 | Power-good status outputs | Open-drain signals indicating stable regulation per VR channel; used for sequencing and fault isolation |
| VBOOT1, VBOOT2 | Bootstrap supply inputs | Set initial gate drive voltage for high-side MOSFETs; programmable via external resistor divider |
| IMON1, IMON2 | Current monitor outputs | Analog voltage proportional to sensed phase current - supports external current limiting or telemetry |
Key Features
| Feature | Design Value |
|---|---|
| R3™ PWM Modulation | Variable switching frequency during transients improves light-load efficiency and reduces output capacitance requirements |
| Dual Independent Remote Sense | Enables precise load-line regulation at CPU die for both VR1 and VR2 under dynamic load conditions |
| Programmable VBOOT | Prevents bootstrap capacitor overvoltage and high-side FET gate overstress during cold start and recovery |
| Adaptive Body Diode Conduction Time Reduction | Minimizes reverse conduction losses in synchronous rectifiers, improving full-load efficiency by ~1–2% |
| Shared Serial Bus Architecture | Reduces PCB routing complexity and eliminates need for second VR controller IC in 1+1 configurations |
Applications
| Notebook CPU Core VRM | Desktop VR12™ Motherboard |
|---|---|
Use Scenario: Dual-core CPU with discrete GPU requiring independent core and I/O voltage rails. IC Role / Device Role / Timing Role: Primary 1+1 phase VR controller managing CPU VCC and VCCIO with IMVP-7/VR12™ compliance. Use Value: Enables single-chip dual-rail regulation with shared SMBus, reducing BOM cost and board area by eliminating second VR controller. | Use Scenario: High-performance desktop platform supporting VR12™ specification with strict load-line and transient response requirements. IC Role / Device Role / Timing Role: Dual 1-phase VR controller delivering tightly regulated VDD and VDDIO with differential remote sensing and programmable IMAX. Use Value: Achieves ±0.5% system accuracy and fast transient settling via R3™ modulation, meeting VR12™ spec for CPU voltage tolerance and droop. |
| Embedded Computing Module | Workstation Thin Client |
Use Scenario: Fanless embedded system requiring low-noise, high-efficiency CPU power with thermal-aware current limiting. IC Role / Device Role / Timing Role: Dual VR controller implementing DCR current sensing with single NTC thermistor for temperature-compensated phase current monitoring. Use Value: Eliminates current-sense resistors and associated power loss while maintaining accuracy across −40°C to +105°C ambient. | Use Scenario: Space-constrained thin client with integrated graphics needing independent core and memory I/O regulation. IC Role / Device Role / Timing Role: 1+1 VR controller providing programmable TMAX and VBOOT for safe startup and thermal derating of both rails. Use Value: Supports robust cold-start behavior and graceful thermal throttling without external supervision logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 1-phase VR controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95835IRZ | Supports configurable 3/2/1-phase on VR1 and fixed 1-phase on VR2; larger feature set including 3 integrated gate drivers | Targeted for higher-current CPUs requiring >1-phase on primary rail; not pin-to-pin compatible with ISL95837IRZ | Select ISL95835IRZ only when 3-phase capability on VR1 is required; ISL95837IRZ offers optimized cost and layout for true 1+1 use cases |
| RT8803AZQW | Single-chip dual 1-phase VR controller with VR12.0 compliance; lacks R3™ modulation and uses fixed-frequency PWM | Designed for mainstream VR12.0 platforms with less stringent transient response requirements | Choose RT8803AZQW where lower cost and simpler design outweigh need for R3™-level transient performance and adaptive body diode control |
Compared with ISL95837IRZ, ISL95835IRZ adds phase configurability but increases complexity and cost for 1+1 systems, while RT8803AZQW provides VR12.0 compliance without R3™ benefits-making ISL95837IRZ optimal for designs prioritizing transient response, thermal-aware current sensing, and compact dual-rail integration.
Availability
ISL95837IRZ is available at Aetrix Electronics and suitable for notebook CPU VRMs, VR12™ desktop motherboards, and embedded computing modules requiring stable component supply and long-term industrial availability.
Supply support for ISL95837IRZ 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
Renesas Electronics Corporation acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio. Intersil was known for robust power ICs targeting computing and industrial applications.
The ISL95837IRZ belongs to Intersil's IMVP-7/VR12™-compliant voltage regulator family, engineered specifically for efficient, accurate, and standards-compliant CPU core and I/O power delivery in space-constrained client platforms.
FAQ
What is the primary function of the ISL95837IRZ in a CPU power delivery system?
The ISL95837IRZ serves as a dual-output, 1+1 phase voltage regulator controller for IMVP-7/VR12™-compliant CPUs. It manages both core (VDD) and I/O (VDDIO) rails independently, using R3™ PWM modulation, differential remote sensing, and programmable parameters like VBOOT and IMAX. Its integrated serial interface enables direct CPU communication, making ISL95837IRZ essential for precise, responsive, and standards-aligned CPU power delivery.
Does the ISL95837IRZ support DCR current sensing with temperature compensation?
Yes, the ISL95837IRZ supports lossless inductor DCR current sensing on both outputs, with built-in support for single NTC thermistor-based temperature compensation. This allows accurate phase current measurement across temperature without external resistors, preserving efficiency and simplifying layout. The DCR sensing path is fully integrated within ISL95837IRZ, and calibration is handled via the device's internal circuitry per the FN7671 datasheet.
Is the ISL95837IRZ pin-compatible with the ISL95835IRZ?
No, the ISL95837IRZ is not pin-compatible with the ISL95835IRZ. Although both share the same 48-pin QFN package footprint, their pin assignments differ significantly-particularly for phase driver enable, current monitor, and configuration pins. The ISL95837IRZ is optimized for fixed 1+1 operation, while ISL95835IRZ supports flexible multi-phase configurations. Board-level replacement requires redesign; ISL95837IRZ must be used with its validated pinout.
What is the role of the R3™ technology in the ISL95837IRZ?
R3™ (Robust Ripple Regulator) technology in the ISL95837IRZ enables variable switching frequency during load transients, resulting in faster output voltage settling and improved light-load efficiency. Unlike fixed-frequency PWM, R3™ dynamically adjusts frequency to maintain stability and minimize output capacitor requirements. This architecture is intrinsic to ISL95837IRZ's ability to meet IMVP-7/VR12™ transient specifications without external compensation components.
Can the ISL95837IRZ be used in VR12.0-compliant systems?
Yes, the ISL95837IRZ is explicitly designed for VR12™ compliance-including VR12.0-and meets all mandatory electrical, timing, and communication requirements such as SMBus protocol, load-line regulation, and Power-Good assertion timing. Its 0.5% system accuracy, programmable TMAX/IMAX, and differential remote sensing ensure full adherence to VR12.0 specifications when implemented per the ISL95837IRZ reference design guidelines.
ISL95837IRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Converter, Intel IMVP-7, VR12™
- Voltage - Input:
- 4.5V ~ 5.5V
- Number of Outputs:
- 2
- Voltage - Output:
- Up to 1.52V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (5x5)
ISL95837IRZ FAQ
1.How can I place an order for ISL95837IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95837IRZ 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 ISL95837IRZ reliable?
The price and inventory of ISL95837IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95837IRZ is usually 5 days.
3.What payment methods are accepted for ISL95837IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95837IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95837IRZ?
ISL95837IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95837IRZ 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 ISL95837IRZ?
For technical support, including ISL95837IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95837IRZ requirements.
6.How does Aetrix verify that ISL95837IRZ is sourced from the original manufacturer or authorized distributors?
All ISL95837IRZ 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 ISL95837IRZ meets industry standards.
7.What is the process for return or replacement of ISL95837IRZ?
All ISL95837IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL95837IRZ, 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 ISL95837IRZ part is unused and in its original packaging.
Return procedure for ISL95837IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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