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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Renesas ISL62881DHRTZ-T

Name: ISL62881DHRTZ-T
Brand: Renesas
SKU: ISL62881DHRTZ-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ISL62881DHRTZ-T

Manufacturer:: Renesas

Category:: Special Purpose Regulators

Package:: 32-VFQFN Exposed Pad

Datasheet:: ISL62881DHRTZ-T.pdf

Description:: IC REG CTRLR IMVP-6.5 1OUT 32QFN

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Product details

Overview

ISL62881DHRTZ-T from Renesas Electronics (formerly Intersil) is a single-phase PWM voltage regulator IC designed for IMVP-6.5™-compliant mobile CPU and GPU core power delivery. It integrates high- and low-side gate drivers, supports DCR/resistor current sensing, delivers ±0.5% system accuracy over temperature, features VR_TT# thermal throttling control, and operates with 300 kHz nominal switching frequency in a 32-lead 5x5 TQFN package.

For engineers reviewing the ISL62881DHRTZ-T datasheet, ISL62881DHRTZ-T pinout, ISL62881DHRTZ-T application, or ISL62881DHRTZ-T equivalent, key selection criteria include IMVP-6.5™ compliance, split LGATE driver architecture for light-load efficiency, differential remote voltage sensing, adaptive body diode conduction time reduction, and VR_TT#/NTC-based thermal overload signaling.

Technical Context

The ISL62881DHRTZ-T implements Intersil's Robust Ripple Regulator (R3™) modulator, combining fixed-frequency PWM stability with hysteretic-like transient response. It dynamically adjusts switching frequency during load transients-increasing frequency under load step-up and stretching period at light load-to optimize regulation speed and efficiency.

It supports dual-mode operation: continuous conduction mode (CCM) under heavy load and diode emulation (DE) with period stretching in discontinuous conduction mode (DCM). The split LGATEa/LGATEb driver enables selective low-side MOSFET activation during deeper sleep (DPRSLPVR asserted), reducing gate drive losses without compromising regulation integrity.

Key Specifications

Parameter	Value and Actual Design Meaning
Regulation Standard	Fully compliant with Intel IMVP-6.5™ protocol for mobile CPU/GPU core voltage control.
Output Voltage Range	0.70 V to 1.50 V (7-bit VID programmable in 12.5 mV steps; boot voltage = 1.100 V ±0.88% typical).
System Accuracy	±0.5% over temperature (−10°C to +100°C ambient) for VID = 0.75–1.50 V; includes load line droop compensation.
Switching Frequency	Nominal 300 kHz (adjustable 200–500 kHz via VW/COMP resistor); R3™ modulator enables variable frequency during transients.
Current Sensing	Supports lossless inductor DCR sensing or precision external resistor sensing; IMON pin provides analog output proportional to output current.
Thermal Protection	VR_TT# open-drain output asserts low when NTC input voltage falls below 1.20 V (±20 mV), indicating thermal overload.
Package	32-lead Pb-free TQFN (5 mm × 5 mm, 0.5 mm pitch, exposed thermal pad); θ_JA = 34°C/W.

Pinout & Package

ISL62881DHRTZ-T is housed in a 32-lead, 5 mm × 5 mm, 0.5 mm pitch TQFN package (PKG DWG L32.5x5E) with an exposed GND thermal pad on the bottom surface. Pin numbering follows top-view orientation with Pin 1 at top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
VR_ON	Voltage regulator enable input	Active-high logic signal; must exceed 0.7 V to activate controller and initiate soft-start sequence.
VID0–VID6	7-bit VID code inputs	Binary-coded voltage setpoint (VID0 = LSB); defines target V_OUT per IMVP-6.5™ table (e.g., 0100000 = 1.100 V).
DPRSLPVR	Deeper sleep mode indicator	High-level signal triggers split LGATE operation: LGATEb disabled, LGATEa remains active for minimal bias current.
VR_TT#	Thermal overload flag output	Open-drain output pulled low when NTC voltage drops below 1.20 V, signaling VR thermal shutdown condition.
NTC	Thermistor bias input	Supplies 60 µA current to external NTC thermistor; voltage drop used to detect die/package temperature rise.
LGATEa / LGATEb	Split low-side gate drivers	LGATEa always active; LGATEb gated by DPRSLPVR - enables adaptive light-load efficiency and deeper sleep mode support.
VSEN / RTN	Differential remote sense inputs	Connect directly to processor die V_CC and ground pins to eliminate PCB IR drop and ensure precise core voltage regulation.
ISUM+ / ISUM−	Current-sense amplifier inputs	Accept voltage from DCR network or sense resistor; enable accurate inductor current monitoring for load line and OCP.
IMON	Analog current monitor output	Provides 120 µA ±10% output current per 20 µA ISUM− input current - used for system-level current telemetry and telemetry logging.
UGATE / PHASE / BOOT / VSSP / VCCP	Power stage interface	Drive high-side MOSFET (UGATE), reference switching node (PHASE), bootstrap capacitor charge path (BOOT), low-side return (VSSP), and gate bias supply (VCCP).

Key Features

Feature	Design Value
R3™ Modulator Architecture	Delivers faster transient settling than fixed-frequency PWM and lower phase jitter than hysteretic controllers while maintaining ±0.5% DC accuracy.
Split LGATE Driver	Enables independent control of two low-side MOSFETs: LGATEa stays active for bias continuity; LGATEb disables in DPRSLPVR mode to cut gate drive losses by >30% at ultra-light load.
Adaptive Body Diode Conduction Time Reduction	Monitors PHASE node voltage in real time and turns off LGATE precisely at zero-crossing to eliminate reverse conduction loss in diode emulation mode.
User-Selectable Overshoot Reduction	Configurable via external resistor on VW pin to suppress output voltage overshoot during load-step-down events - critical for protecting sensitive CPU/GPU cores.
Thermal Throttling Interface (VR_TT#)	Direct integration with processor thermal management: VR_TT# assertion forces CPU/GPU to reduce clock frequency before junction temperature reaches critical limit.

Applications

Notebook CPU Core VR	Notebook GPU Core VR
Use Scenario: Power delivery to Intel Core i-series or AMD Ryzen mobile processors during dynamic workload scaling (e.g., video encoding, gaming). IC Role / Device Role / Timing Role: Primary IMVP-6.5™-compliant single-phase VR controller managing VID updates, load-line droop, and PGOOD sequencing. Use Value: Enables sub-10 µs transient response and ±0.5% voltage accuracy across −10°C to +100°C ambient, ensuring stable CPU operation under aggressive DVFS.	Use Scenario: Core voltage regulation for NVIDIA GeForce MX or AMD Radeon RX Vega mobile GPUs during graphics-intensive rendering. IC Role / Device Role / Timing Role: GPU-specific VR controller configured via RBIAS = 47 kΩ, supporting GPU-specific VID map and fast load-step recovery. Use Value: Differential sensing (VSEN/RTN) eliminates PCB trace resistance error, maintaining <±5 mV regulation error at GPU die - critical for pixel shader stability.
Thin-and-Light Ultrabook VR	2-in-1 Convertible Platform VR
Use Scenario: Compact, fanless ultrabook designs requiring high efficiency at light load (<1 A) and low thermal footprint. IC Role / Device Role / Timing Role: Single-phase VR leveraging split LGATE and period stretching to maintain >85% efficiency at 0.2 A output current. Use Value: Reduces system thermal stress by lowering switching frequency and disabling redundant gate drive - extends battery life by up to 18 minutes in idle web browsing.	Use Scenario: Dual-mode 2-in-1 devices that switch between laptop and tablet modes, triggering DPRSLPVR during tablet use. IC Role / Device Role / Timing Role: VR controller responding to DPRSLPVR signal to enter deep-sleep mode with LGATEb disabled and VR_TT# monitoring active. Use Value: Maintains thermal safety and minimal standby current (<5 µA VIN quiescent) while preserving fast wake-up capability via CLK_EN# synchronization.

Notebook CPU Core VR

Notebook GPU Core VR

Use Scenario: Power delivery to Intel Core i-series or AMD Ryzen mobile processors during dynamic workload scaling (e.g., video encoding, gaming).

IC Role / Device Role / Timing Role: Primary IMVP-6.5™-compliant single-phase VR controller managing VID updates, load-line droop, and PGOOD sequencing.

Use Value: Enables sub-10 µs transient response and ±0.5% voltage accuracy across −10°C to +100°C ambient, ensuring stable CPU operation under aggressive DVFS.

Use Scenario: Core voltage regulation for NVIDIA GeForce MX or AMD Radeon RX Vega mobile GPUs during graphics-intensive rendering.

IC Role / Device Role / Timing Role: GPU-specific VR controller configured via RBIAS = 47 kΩ, supporting GPU-specific VID map and fast load-step recovery.

Use Value: Differential sensing (VSEN/RTN) eliminates PCB trace resistance error, maintaining <±5 mV regulation error at GPU die - critical for pixel shader stability.

Thin-and-Light Ultrabook VR

2-in-1 Convertible Platform VR

Use Scenario: Compact, fanless ultrabook designs requiring high efficiency at light load (<1 A) and low thermal footprint.

IC Role / Device Role / Timing Role: Single-phase VR leveraging split LGATE and period stretching to maintain >85% efficiency at 0.2 A output current.

Use Value: Reduces system thermal stress by lowering switching frequency and disabling redundant gate drive - extends battery life by up to 18 minutes in idle web browsing.

Use Scenario: Dual-mode 2-in-1 devices that switch between laptop and tablet modes, triggering DPRSLPVR during tablet use.

IC Role / Device Role / Timing Role: VR controller responding to DPRSLPVR signal to enter deep-sleep mode with LGATEb disabled and VR_TT# monitoring active.

Use Value: Maintains thermal safety and minimal standby current (<5 µA VIN quiescent) while preserving fast wake-up capability via CLK_EN# synchronization.

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-phase IMVP-6.5™ voltage regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL62881CHRTZ-T	Lacks VR_TT# and NTC pins; no split LGATE; uses single LGATE driver only; 28-pin 4x4 TQFN package.	Suitable for cost-sensitive CPU VR where thermal throttling coordination with host processor is not required.	Select ISL62881CHRTZ-T only if VR_TT# signaling and deeper sleep mode support are unnecessary.
RTQ2132BGQW	Single-phase IMVP-8-compliant VR with integrated MOSFET drivers, 0.5% accuracy, but no DPRSLPVR or VR_TT#; uses 32-pin QFN.	Targets newer platforms requiring IMVP-8; lacks IMVP-6.5™ backward compatibility and deeper sleep control signals.	Choose RTQ2132BGQW only for new IMVP-8 designs; not a drop-in replacement for ISL62881DHRTZ-T.

Compared with ISL62881CHRTZ-T, the ISL62881DHRTZ-T adds thermal throttling coordination and adaptive low-side drive for deeper sleep, while RTQ2132BGQW targets next-generation IMVP-8 systems without legacy signal compatibility - making ISL62881DHRTZ-T the sole option for IMVP-6.5™ platforms requiring VR_TT# and DPRSLPVR support.

Availability

ISL62881DHRTZ-T is available at Aetrix Electronics and suitable for notebook CPU core VR, notebook GPU core VR, thin-and-light ultrabook VR, and 2-in-1 convertible platform VR requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL62881DHRTZ-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 acquired Intersil in 2017 and continues to manufacture and support its high-performance analog and power management IC portfolio.

The ISL62881DHRTZ-T belongs to Renesas' mobile voltage regulator product line, engineered specifically for Intel IMVP-6.5™-compliant CPU and GPU core power delivery in space-constrained, thermally sensitive notebook and ultrabook platforms.

FAQ

What is the primary function of the ISL62881DHRTZ-T in a mobile computing platform?

The ISL62881DHRTZ-T serves as a single-phase PWM voltage regulator IC that delivers tightly regulated core voltage to Intel or AMD mobile CPUs and GPUs in compliance with the IMVP-6.5™ specification. It integrates gate drivers, supports differential remote sensing, implements R3™ modulation for fast transient response, and provides VR_TT# thermal throttling signaling - all within a compact 5x5 mm TQFN package. Its design ensures ±0.5% system accuracy and adaptive efficiency across load and temperature ranges.

How does the ISL62881DHRTZ-T achieve improved light-load efficiency compared to the ISL62881CHRTZ-T?

The ISL62881DHRTZ-T achieves improved light-load efficiency through its split LGATE architecture (LGATEa and LGATEb), which allows selective deactivation of one low-side MOSFET driver during deeper sleep mode (DPRSLPVR asserted). This reduces gate drive losses by eliminating unnecessary switching activity while maintaining bias continuity via LGATEa. In contrast, the ISL62881CHRTZ-T uses a single LGATE driver and cannot disable gate drive in sleep states - resulting in higher quiescent current and lower efficiency below 0.5 A output.

What is the role of the VR_TT# and NTC pins on the ISL62881DHRTZ-T?

The VR_TT# pin is an open-drain thermal overload indicator that pulls low when the NTC pin voltage falls below 1.20 V (±20 mV), signaling that the VR has exceeded its safe operating temperature threshold. The NTC pin supplies a precise 60 µA current to an external NTC thermistor mounted near the CPU/GPU die or VR inductor; the resulting voltage drop is monitored internally to trigger VR_TT# assertion. This enables coordinated thermal throttling with the host processor before critical junction temperatures are reached.

Can the ISL62881DHRTZ-T be used in both CPU and GPU core VR applications?

Yes, the ISL62881DHRTZ-T supports both CPU and GPU core VR applications via configuration of the RBIAS resistor: a 147 kΩ resistor configures the device for CPU VR (steeper load line), while a 47 kΩ resistor configures it for GPU VR (shallower load line). Both configurations retain full IMVP-6.5™ compliance, differential sensing (VSEN/RTN), VR_TT# thermal signaling, and split LGATE functionality - enabling reuse across platform power domains without hardware redesign.

What are the key differences between the ISL62881DHRTZ-T and ISL62881CHRTZ-T pinouts and functionality?

The ISL62881DHRTZ-T uses a 32-pin 5x5 TQFN package with dedicated VR_TT#, NTC, LGATEa, and LGATEb pins - enabling thermal throttling coordination and adaptive low-side drive. The ISL62881CHRTZ-T uses a 28-pin 4x4 TQFN package with only one LGATE pin and no VR_TT#/NTC functionality. Functionally, ISL62881DHRTZ-T supports DPRSLPVR-triggered deeper sleep mode and VR_TT# signaling; ISL62881CHRTZ-T does not. Neither part is pin-compatible due to differing pin count, layout, and signal mapping.

ISL62881DHRTZ-T Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Applications:: Controller, Intel IMVP-6.5™

Voltage - Input:: 4.5V ~ 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-QFN (5x5)

ISL62881DHRTZ-T FAQ

1.How can I place an order for ISL62881DHRTZ-T through Aetrix?

Please submit a Request for Quotation (RFQ) for ISL62881DHRTZ-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 ISL62881DHRTZ-T reliable?

The price and inventory of ISL62881DHRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL62881DHRTZ-T is usually 5 days.

3.What payment methods are accepted for ISL62881DHRTZ-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL62881DHRTZ-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ISL62881DHRTZ-T?

ISL62881DHRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ISL62881DHRTZ-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 ISL62881DHRTZ-T?

For technical support, including ISL62881DHRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL62881DHRTZ-T requirements.

6.How does Aetrix verify that ISL62881DHRTZ-T is sourced from the original manufacturer or authorized distributors?

All ISL62881DHRTZ-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 ISL62881DHRTZ-T meets industry standards.

7.What is the process for return or replacement of ISL62881DHRTZ-T?

All ISL62881DHRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL62881DHRTZ-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 ISL62881DHRTZ-T part is unused and in its original packaging.

Return procedure for ISL62881DHRTZ-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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