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Renesas ISL62881BHRTZ-T
- Part No.:
- ISL62881BHRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
ISL62881BHRTZ-T.pdf
- Description:
- IC REG CTRL IMVP-6.5 1OUT 32TQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL62881BHRTZ-T from Renesas Electronics (formerly Intersil) is a single-phase PWM buck regulator IC designed for IMVP-6.5™-compliant core power delivery to mobile CPUs and GPUs. It integrates high- and low-side gate drivers, supports 7-bit VID input (0V–1.500V in 12.5mV steps), delivers ±0.5% system voltage accuracy over temperature, and implements Robust Ripple Regulator (R3™) technology for adaptive switching frequency up to 500kHz. It operates across 4.5V–25V VIN and -10°C to +100°C ambient.
For engineers reviewing the ISL62881BHRTZ-T datasheet, ISL62881BHRTZ-T pinout, ISL62881BHRTZ-T application, or ISL62881BHRTZ-T equivalent, key selection criteria include VR_TT# thermal throttling support, split LGATEa/LGATEb driver architecture for light-load efficiency, differential remote sensing (VSEN/RTN), IMON current monitoring output, and compliance with Intel IMVP-6.5™ slew rate and droop requirements.
Technical Context
The ISL62881BHRTZ-T implements a patented R3™ modulator combining fixed-frequency PWM stability with hysteretic-like transient response: COMP voltage dynamics control clock generation and PWM pulse width, while VW sets a voltage window that scales with load transients to increase effective bandwidth. Its dual low-side gate drivers (LGATEa always active, LGATEb gated by DPRSLPVR) enable diode emulation mode with adaptive body diode conduction time reduction.
It supports two current-sensing topologies-lossless inductor DCR sensing with NTC-based thermal compensation, or precision resistor sensing-and uses differential remote sensing (VSEN/RTN) referenced to the processor die. The VR_TT# output asserts low upon NTC-detected overtemperature (1.18–1.22V threshold), enabling system-level thermal throttling without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5V to 25V - supports wide-input battery-supplied mobile platforms without pre-regulation |
| Output Voltage Range | 0V to 1.500V via 7-bit VID - covers full IMVP-6.5™ CPU/GPU core voltage range with 12.5mV resolution |
| System Accuracy | ±0.5% over -10°C to +100°C - ensures stable core voltage regulation under thermal stress |
| Switching Frequency | 200kHz to 500kHz adjustable - enables optimization of efficiency vs. size via VW resistor |
| Thermal Throttling | VR_TT# output with 1.18–1.22V NTC threshold - provides direct interface to platform thermal management logic |
| Current Sensing | DCR or discrete resistor - eliminates sense resistor power loss or enables precise calibration |
| Light-Load Efficiency | Split LGATEa/LGATEb architecture - reduces gate drive losses during diode emulation mode |
Pinout & Package
ISL62881BHRTZ-T is housed in a 32-lead, 5mm × 5mm, 0.5mm pitch TQFN package with exposed thermal pad (PKG DWG L32.5x5E). The bottom GND pad must be soldered for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VR_ON | Enable input | Active-high logic signal; must exceed 0.7V to activate regulator and initiate soft-start sequence |
| VID0–VID6 | 7-bit voltage identification bus | Set target Vcore; LSB = VID0, MSB = VID6; supports on-the-fly VID changes per IMVP-6.5™ |
| DPRSLPVR | Deep sleep control | Enables diode emulation mode; controls LGATEb activation and (in GPU mode) Vcore slew rate (5/10 mV/µs) |
| VSEN / RTN | Differential remote sense inputs | Connect directly to CPU/GPU die VCC/VSS pins to eliminate PCB IR drop errors |
| IMON | Analog current monitor output | Sinks 30µA per 5µA ISUM- current - provides real-time output current feedback for telemetry or protection |
| VR_TT# | Open-drain thermal alert | Pulls low when NTC voltage drops below 1.18V - signals thermal overload to host controller |
| LGATEa / LGATEb | Split low-side gate drivers | LGATEa drives primary low-side FET continuously; LGATEb drives secondary FET only in active mode |
| UGATE / PHASE / BOOT | High-side gate drive path | UGATE drives HS-FET gate; PHASE is switching node; BOOT supplies floating bias via external capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Robust Ripple Regulator (R3™) modulator | Variable-frequency control improves transient response >2× vs. fixed-frequency PWM while maintaining 0.5% DC accuracy |
| Split LGATE architecture (LGATEa + LGATEb) | Reduces light-load gate drive loss by disabling one low-side driver in deep sleep, increasing efficiency at <10% load |
| Adaptive body diode conduction time reduction | Minimizes reverse conduction loss in diode emulation mode by turning off LGATE at zero-crossing of phase node |
| Differential remote voltage sensing (VSEN/RTN) | Compensates for PCB trace resistance up to 50mΩ, ensuring die-level voltage regulation within ±0.5% |
| User-selectable overshoot reduction | Allows aggressive capacitor reduction (e.g., fewer ceramic caps) or disables for thermal-sensitive GPU applications |
Applications
| Notebook CPU Core Power | Notebook GPU Core Power |
|---|---|
Use Scenario: Power delivery to Intel Core i-series or AMD Ryzen mobile processors requiring IMVP-6.5™ compliance, dynamic VID updates, and fast load-step response. IC Role / Device Role / Timing Role: Single-phase buck controller managing Vcore rail with differential sensing, droop-based load line, and DPRSLPVR-triggered diode emulation. Use Value: Enables sub-50ns transient response to 50% load steps and maintains ±0.5% voltage accuracy across -10°C to +100°C ambient. | Use Scenario: Core power for NVIDIA GeForce MX or AMD Radeon Vega graphics in thin-and-light notebooks with audio-noise-sensitive operation. IC Role / Device Role / Timing Role: IMVP-6.5™-compliant GPU VR controller supporting audio-filtering mode and programmable slew rates (5/10 mV/µs). Use Value: Reduces audible coil whine via optimized R3™ modulation and supports GPU-specific thermal throttling via VR_TT#. |
| Mobile Thin-and-Light Platform VR | IMVP-6.5™ Reference Design |
Use Scenario: Space-constrained ultrabook designs requiring high power density, low thermal footprint, and seamless integration with Intel PCH power management. IC Role / Device Role / Timing Role: Primary core VR delivering up to 45A with 32-pin 5x5mm TQFN package, integrated gate drivers, and NTC-compensated DCR sensing. Use Value: Eliminates external gate drivers and current-sense amplifiers, reducing BOM count by ≥6 components versus discrete solutions. | Use Scenario: Validation and compliance testing of IMVP-6.5™ power delivery against Intel reference specifications. IC Role / Device Role / Timing Role: Fully compliant reference controller implementing all mandatory features: VID decoding, CLK_EN#, PGOOD, IMON, VR_TT#, and load-line droop. Use Value: Accelerates platform qualification by meeting IMVP-6.5™ timing, accuracy, and protection requirements out-of-box. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-phase IMVP-6.5™ core regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL62881HRTZ-T | 28-pin 4x4 TQFN; no VR_TT# or split LGATE; supports CPU/GPU but lacks thermal throttling output | Targeted at cost-sensitive CPU-only designs without platform-level thermal management requirements | Select ISL62881HRTZ-T only if VR_TT# and LGATEb functionality are unnecessary and board space allows larger 4x4mm footprint |
| RTQ2136BGE | Single-phase IMVP-8.0 controller; 3.3V–24V VIN; integrated MOSFET drivers; no VR_TT#; supports 8-bit VID | Designed for newer Intel 11th+ gen CPUs; not IMVP-6.5™-compliant; requires different VID mapping and timing | Choose RTQ2136BGE only for new IMVP-8.0 designs; not a drop-in replacement for ISL62881BHRTZ-T due to protocol and pinout incompatibility |
Compared with ISL62881HRTZ-T, the ISL62881BHRTZ-T adds VR_TT# and split LGATE for enhanced thermal management and light-load efficiency, while RTQ2136BGE targets next-generation IMVP-8.0 platforms with higher integration but incompatible control logic and VID structure.
Availability
ISL62881BHRTZ-T is available at Aetrix Electronics and suitable for notebook CPU core power, GPU core power, mobile thin-and-light platform VR, and IMVP-6.5™ reference design applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL62881BHRTZ-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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and computing markets.
The ISL62881B belongs to Renesas' high-performance power management IC portfolio, engineered specifically for Intel IMVP-6.5™ mobile CPU and GPU core voltage regulation with emphasis on transient response, thermal intelligence, and layout efficiency.
FAQ
What is the function of the VR_TT# pin on the ISL62881BHRTZ-T?
The VR_TT# pin on the ISL62881BHRTZ-T is an open-drain thermal alert output that pulls low when the NTC thermistor voltage falls below 1.18V, indicating die or board overtemperature. It interfaces directly with platform management controllers to trigger thermal throttling, and its threshold is factory-trimmed to 1.18–1.22V over temperature. This feature is exclusive to the ISL62881B variant and is not present on the base ISL62881HRTZ-T.
How does the split LGATE architecture (LGATEa and LGATEb) improve efficiency in the ISL62881BHRTZ-T?
The split LGATE architecture in the ISL62881BHRTZ-T improves light-load efficiency by decoupling low-side gate drive: LGATEa remains active to sustain regulation, while LGATEb is disabled during deep sleep (DPRSLPVR high), eliminating redundant gate charge/discharge losses. This reduces total gate drive current by ~40% at 5% load versus single-LGATE designs, directly extending battery life in idle or low-utilization states without compromising transient performance.
Does the ISL62881BHRTZ-T support both DCR and resistor-based current sensing?
Yes, the ISL62881BHRTZ-T supports both lossless inductor DCR current sensing and precision discrete resistor sensing. DCR sensing uses ISUM+ and ISUM- inputs with NTC compensation for temperature drift; resistor sensing connects a sense resistor between the inductor and ground, feeding the same ISUM pins. Both methods feed the same droop amplifier and overcurrent protection circuitry, allowing designers to choose based on cost, accuracy, or thermal constraints without changing IC configuration.
What is the purpose of the CLK_EN# signal in the ISL62881BHRTZ-T?
The CLK_EN# signal in the ISL62881BHRTZ-T is an open-drain output that enables the system PLL clock after the Vcore output reaches within 10% of its boot voltage for 13 consecutive switching cycles (~43µs at 300kHz). It provides synchronization between power rail stabilization and clock domain activation, ensuring deterministic system boot timing. External pull-up (680Ω to VCCP or 1.9kΩ to 3.3V) is required for proper logic-level assertion.
Can the ISL62881BHRTZ-T be used in GPU applications requiring audio filtering?
Yes, the ISL62881BHRTZ-T supports audio filtering for GPU applications through its R3™ modulator architecture and user-selectable overshoot reduction function. By adjusting the VW resistor and enabling overshoot reduction, switching noise harmonics can be shifted away from audible frequencies (20Hz–20kHz), suppressing coil whine. The datasheet explicitly lists "Audio-filtering for GPU Application" as a feature, and GPU-specific slew rate control (5/10 mV/µs via DPRSLPVR) further optimizes transient behavior for graphics workloads.
ISL62881BHRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Controller, Intel IMVP-6.5™
- Voltage - Input:
- 5V ~ 25V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.013V ~ 1.5V
- Operating Temperature:
- -10°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFN (5x5)
ISL62881BHRTZ-T FAQ
1.How can I place an order for ISL62881BHRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL62881BHRTZ-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 ISL62881BHRTZ-T reliable?
The price and inventory of ISL62881BHRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL62881BHRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL62881BHRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL62881BHRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL62881BHRTZ-T?
ISL62881BHRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL62881BHRTZ-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 ISL62881BHRTZ-T?
For technical support, including ISL62881BHRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL62881BHRTZ-T requirements.
6.How does Aetrix verify that ISL62881BHRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL62881BHRTZ-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 ISL62881BHRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL62881BHRTZ-T?
All ISL62881BHRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL62881BHRTZ-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 ISL62881BHRTZ-T part is unused and in its original packaging.
Return procedure for ISL62881BHRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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