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Renesas ISL95870AIRUZ-T
- Part No.:
- ISL95870AIRUZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 20-UFQFN
- Datasheet:
-
ISL95870AIRUZ-T.pdf
- Description:
- IC REG CTRLR GPU 1OUT 20UTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,910
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Product details
Overview
ISL95870AIRUZ-T from Renesas (formerly Intersil) is a single-phase synchronous-buck PWM DC/DC controller optimized for portable GPU core-voltage regulation. It features R4™ modulator technology, 3.3V–25V input range, 0.5V–5V programmable output, ±0.5% system accuracy over –40°C to +100°C, and integrated MOSFET drivers with Schottky bootstrap diode - deployed in mobile PC GPU VCC rails requiring dynamic voltage scaling and high transient response.
For engineers reviewing the ISL95870AIRUZ-T datasheet, ISL95870AIRUZ-T pinout, ISL95870AIRUZ-T application, or ISL95870AIRUZ-T equivalent, key selection criteria include VID-based multi-setpoint voltage control, selectable 300/500/600/1MHz switching frequency, remote differential sensing, automatic diode-emulation mode for light-load efficiency, and thermal robustness across –40°C to +100°C industrial operating range.
Technical Context
The ISL95870AIRUZ-T implements Intersil's proprietary R4™ frequency-controlled modulator architecture, delivering faster transient response and fully internal compensation versus prior R3 designs. Its dual-loop control integrates VO-sensed output voltage regulation with ROCSET-based current-limit detection and adaptive shoot-through protection.
This variant supports 2-bit VID inputs (VID0/VID1) selecting four independent resistor-programmed output setpoints between 0.5V and 1.5V (or up to 5V with feedback divider), with soft-start and slew-rate controlled by external capacitor on SREF - enabling precise GPU core voltage sequencing during state transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 25V - supports direct battery or AC-adapter input without pre-regulation in mobile platforms. |
| Output Voltage Range | 0.5V to 5V - programmable via VID inputs and external resistors, covering GPU core, I/O, and memory controller rail requirements. |
| System Accuracy | ±0.5% over –40°C to +100°C - ensures stable GPU core voltage under thermal stress without calibration. |
| Switching Frequency | Selectable 300/500/600/1MHz - enables optimization of size (higher fSW) vs. efficiency (lower fSW) per board layout constraints. |
| Modulator Technology | R4™ - provides accurately regulated frequency, all-internal compensation, and superior light-load efficiency vs. R3. |
| Diode Emulation Mode | Automatic entry during light load - eliminates reverse recovery losses and improves standby efficiency in mobile idle states. |
| Remote Sensing | Differential VO/RTN inputs - compensates for PCB trace IR drop to maintain ±0.5% regulation at point-of-load. |
Pinout & Package
ISL95870AIRUZ-T is housed in a 20-lead ultra-thin quad flat no-lead (µTQFN) package, 3.2mm × 1.8mm × 0.55mm, with exposed thermal pad (L20.3.2x1.8 footprint). Pin 1 is located at top-left corner adjacent to notch-marked edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LGATE | Low-side MOSFET gate driver output | Drives gate of synchronous rectifier MOSFET; requires low-inductance routing to minimize shoot-through risk. |
| 2 PGND | Power ground return for LGATE | Must connect directly to source of low-side MOSFET and share thermal pad for optimal heat dissipation. |
| 3 GND | Bias supply and signal reference ground | Separate from PGND; connects to system analog ground plane to avoid noise coupling into error amplifier. |
| 4 RTN | Negative remote sense input | Completes Kelvin sense path with FB; must mirror RFB/ROFS divider used at FB to cancel offset errors. |
| 5 VID1 | VID logic select bit MSB | Together with VID0, selects one of four resistor-programmed output setpoints; TTL-compatible input. |
| 6 VID0 | VID logic select bit LSB | Paired with VID1 to configure GPU voltage states (e.g., performance/idle/low-power modes). |
| 7 SREF | Soft-start/slew-rate programming & setpoint reference | Capacitor here sets voltage ramp rate; also serves as reference for VID-selected setpoint amplifiers. |
| 8 SET0 | Setpoint resistor input #1 | Connects to resistor defining first VID-selected output voltage; precision matching required for accuracy. |
| 9 SET1 | Setpoint resistor input #2 | Defines second VID-selected output voltage; used with SET0 and optional SET2 for full 4-point programming. |
| 10 FB | Voltage feedback sense input | Compares divided output voltage against SREF; closed-loop regulation point for main control loop. |
| 11 OCSET | Overcurrent threshold programming | ROCSET resistor from this pin to sense node sets current-limit threshold; enables DCR or resistor sensing. |
| 12 VO | Output voltage sense for R4 modulator | Primary voltage input to R4 control loop; also serves as reference for OCSET comparator. |
| 13 FSEL | Frequency selection input | Pull to VCC (1MHz), float (500kHz), 100kΩ to GND (600kHz), or direct GND (300kHz). |
| 14 PGOOD | Open-drain power-good indicator | Asserts after soft-start and within ±10% output regulation; drives external enable/disable logic or fault signaling. |
| 15 EN | Enable input | Active-high; rising edge initiates soft-start sequence; internal pull-down ensures default disable at power-up. |
| 16 PHASE | High-side driver return / VIN sense / polarity detect | Carries high-current switching node; routes to UGATE driver and R4 VIN input; critical for layout integrity. |
| 17 UGATE | High-side MOSFET gate driver output | Drives gate of upper MOSFET; requires low-ESR ceramic bootstrap capacitor between BOOT and PHASE. |
| 18 BOOT | Bootstrap supply for UGATE driver | Internally connected to Schottky cathode; MLCC to PHASE supplies floating gate drive voltage. |
| 19 VCC | Bias supply input (5V) | Supplies internal logic and error amplifier; decoupled with ≥1µF MLCC to GND for noise immunity. |
| 20 PVCC | Power supply for gate drivers | Supplies UGATE/LGATE drivers; decoupled with ≥1µF MLCC to PGND; shares Schottky anode with PVCC. |
Key Features
| Feature | Design Value |
|---|---|
| R4™ Modulator Architecture | Delivers faster transient response and stable regulation without external compensation components - reduces BOM count and layout complexity. |
| 2-Bit VID Voltage Selection | Enables four independent, resistor-programmed output voltages (0.5V–1.5V) for GPU dynamic voltage and frequency scaling (DVFS) states. |
| Selectable Switching Frequency | 300/500/600/1MHz options allow trade-off between inductor size, efficiency, and EMI profile per application requirements. |
| Differential Remote Sensing | VO/RTN inputs eliminate PCB trace resistance error, ensuring ±0.5% regulation accuracy at GPU die input under load. |
| Automatic Diode Emulation Mode | Disables low-side MOSFET during light load, replacing conduction loss with controlled body-diode operation - boosts standby efficiency. |
| Integrated Schottky Bootstrap Diode | Eliminates need for external bootstrap diode, reducing component count and improving reliability in compact mobile layouts. |
Applications
| Mobile GPU Core Rail | Mobile I/O Controller Hub (ICH) |
|---|---|
Use Scenario: Regulating core voltage for discrete or integrated GPUs in ultrabooks and gaming laptops during dynamic workload shifts. IC Role / Device Role / Timing Role: Primary PWM controller managing phase-shifted buck conversion with VID-triggered voltage transitions. Use Value: Enables precise 0.5V–1.5V GPU core voltage scaling across performance, balanced, and battery-saving modes while maintaining ±0.5% accuracy. |
Use Scenario: Powering Intel I/O Controller Hub (ICH) or Platform Controller Hub (PCH) in mobile computing platforms. IC Role / Device Role / Timing Role: Single-phase synchronous buck regulator supplying stable 1.05V–1.8V ICH VCC rail with fast load-step response. Use Value: Supports rapid ICH state transitions (D0–D3) with diode-emulation mode extending battery life during system sleep. |
| Mobile Memory Controller Hub (GMCH) | Embedded GPU Power Management |
Use Scenario: Delivering tightly regulated voltage to graphics memory controller in thin-and-light notebooks with integrated GPU. IC Role / Device Role / Timing Role: High-accuracy buck controller using remote sensing to compensate for VRM-to-GMCH trace losses. Use Value: Maintains 0.5% output regulation at GMCH input despite 50mΩ PCB resistance, preventing timing margin violations. |
Use Scenario: Powering embedded GPUs in automotive infotainment or industrial HMI systems requiring extended temperature operation. IC Role / Device Role / Timing Role: Industrial-grade buck controller rated for –40°C to +100°C ambient, supporting fanless thermal design. Use Value: Guarantees reliable GPU voltage regulation across automotive cabin temperature extremes without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL95870BIRZ-T | Supports three VID-selectable setpoints plus one fixed setpoint via SET2 pin; same 20-pin µTQFN package and –40°C to +100°C rating. | Used where GPU firmware requires five distinct voltage states instead of four; requires additional resistor network on SET2. | Choose ISL95870BIRZ-T only if fifth voltage setpoint is required; otherwise ISL95870AIRUZ-T offers simpler 4-state VID interface. |
| RTQ2136BGQW | Monolithic 3A buck converter (not controller); integrates MOSFETs; 2.7V–5.5V input; fixed 0.6V–3.3V output; no VID interface. | Suitable for lower-power GPU auxiliary rails or non-DVFS applications; lacks remote sensing and multi-setpoint flexibility. | Select RTQ2136BGQW for space-constrained, low-current rails where integration outweighs programmability; not a functional replacement for ISL95870AIRUZ-T. |
Compared with ISL95870BIRZ-T and RTQ2136BGQW, the ISL95870AIRUZ-T uniquely balances VID-based multi-rail flexibility, external power stage control, and industrial temperature support - making it optimal for high-performance mobile GPU core regulation where dynamic voltage scaling and thermal resilience are mandatory.
Availability
ISL95870AIRUZ-T is available at Aetrix Electronics and suitable for mobile GPU core rails, I/O controller hub (ICH) power delivery, and memory controller hub (GMCH) regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL95870AIRUZ-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 acquired Intersil in 2017 and continues its legacy of high-performance analog and power management ICs for computing, industrial, and automotive markets.
The ISL95870AIRUZ-T belongs to Intersil's GPU-specific PWM controller product line, engineered for dynamic voltage scaling, tight regulation accuracy, and robust transient response in thermally constrained mobile platforms.
FAQ
What is the operating temperature range for the ISL95870AIRUZ-T?
The ISL95870AIRUZ-T is rated for –40°C to +100°C ambient operation, validated across the full range for system accuracy, startup reliability, and thermal shutdown behavior. This industrial-grade specification supports deployment in mobile PCs exposed to wide environmental conditions, including automotive-adjacent infotainment systems where under-hood heat soak may affect chassis temperature.
Does the ISL95870AIRUZ-T support remote voltage sensing?
Yes, the ISL95870AIRUZ-T supports true differential remote sensing via dedicated VO and RTN pins. The VO pin connects to the positive output node, while RTN connects to the negative return path at the load - enabling cancellation of PCB trace IR drop. This ensures ±0.5% regulation accuracy at the GPU die input, not just at the regulator output.
How many voltage setpoints can the ISL95870AIRUZ-T support, and how are they selected?
The ISL95870AIRUZ-T supports four independent, resistor-programmed output voltage setpoints selected via 2-bit VID inputs (VID0 and VID1). Each combination (00, 01, 10, 11) configures a unique setpoint defined by external resistors on SET0 and SET1 pins - enabling GPU DVFS states such as performance, balanced, battery-saver, and deep-idle modes.
What switching frequencies does the ISL95870AIRUZ-T support, and how are they configured?
The ISL95870AIRUZ-T supports four discrete switching frequencies: 300kHz, 500kHz, 600kHz, and 1MHz. Configuration is done via the FSEL pin: pull to GND for 300kHz, leave floating for 500kHz, connect to GND through 100kΩ for 600kHz, or pull to VCC for 1MHz - allowing optimization of inductor size, efficiency, and EMI filtering per design constraints.
Is the ISL95870AIRUZ-T pin-compatible with other variants in the ISL95870 family?
No, the ISL95870AIRUZ-T (20-pin µTQFN) is not pin-compatible with the 16-pin ISL95870/ISL95870IRUZ-T variants. While functionally aligned, its 20-pin layout accommodates VID0/VID1, SET0/SET1, and expanded control logic - requiring dedicated PCB footprint and schematic integration. Migration from 16-pin versions necessitates layout revision.
ISL95870AIRUZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- Robust Ripple Regulator™ (R3)
- Package/Case:
- 20-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller, GPU Core Power
- Voltage - Input:
- 3.3V ~ 25V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.5V ~ 5V
- Operating Temperature:
- -40°C ~ 100°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-UTQFN (3.2x1.8)
ISL95870AIRUZ-T FAQ
1.How can I place an order for ISL95870AIRUZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL95870AIRUZ-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 ISL95870AIRUZ-T reliable?
The price and inventory of ISL95870AIRUZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL95870AIRUZ-T is usually 5 days.
3.What payment methods are accepted for ISL95870AIRUZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL95870AIRUZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL95870AIRUZ-T?
ISL95870AIRUZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL95870AIRUZ-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 ISL95870AIRUZ-T?
For technical support, including ISL95870AIRUZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL95870AIRUZ-T requirements.
6.How does Aetrix verify that ISL95870AIRUZ-T is sourced from the original manufacturer or authorized distributors?
All ISL95870AIRUZ-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 ISL95870AIRUZ-T meets industry standards.
7.What is the process for return or replacement of ISL95870AIRUZ-T?
All ISL95870AIRUZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL95870AIRUZ-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 ISL95870AIRUZ-T part is unused and in its original packaging.
Return procedure for ISL95870AIRUZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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