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Renesas ISL91211BIK-REFZ
- Part No.:
- ISL91211BIK-REFZ
- Manufacturer:
- Renesas
- Package:
- Datasheet:
-
ISL91211BIK-REFZ.pdf
- Description:
- EVAL BOARD FOR ISL91211B
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Product details
Overview
ISL91211BIK-REFZ from Renesas is a quad-output, 4-phase programmable PMIC optimized for high-efficiency synchronous buck conversion in space-constrained mobile and AI processor applications. It delivers up to 5A per phase, supports I²C/SPI configuration, features ±0.7% system output accuracy with remote sensing, and integrates low-RDS(ON) MOSFETs (23 mΩ HS / 9 mΩ LS) for compact 2.551 mm × 3.670 mm WLCSP solutions.
For engineers reviewing the ISL91211BIK-REFZ datasheet, ISL91211BIK-REFZ pinout, ISL91211BIK-REFZ application, or ISL91211BIK-REFZ equivalent, this evaluation reference board enables rapid validation of 1+1+1+1 phase reconfiguration, dynamic voltage scaling (3 mV/µs slew), fault protection (UV/OV/OC/OT), and multi-rail sequencing for client SSDs, AR/VR glasses, and optical transceivers.
Technical Context
The ISL91211BIK-REFZ implements Renesas' proprietary R5 control architecture, enabling ultra-fast transient response (±65.5 mV deviation under 50 A/µs load step), seamless DCM/CCM transitions without external compensation, and tight load regulation across -40°C to +85°C. Its four independent buck controllers support flexible phase assignment-each output (VOUT1–VOUT4) maps to one dedicated power stage (PH_A–PH_D) with separate remote sense (RTN1–RTN4) and PVIN supply rails.
It operates from 2.5 V to 5.5 V input, supports programmable PWM frequency (2–6 MHz), and provides I²C-configurable output voltages from 0.3 V to 2.0 V in 1.2–2.0 mV steps depending on feedback divider setting. Four MPIOs and three GPIOs enable configurable interface modes (I²C/SPI), PGOOD reporting, hardware DVS, or enable control without firmware overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Quad output, 1+1+1+1 phase (four independent single-phase bucks) |
| Max Output Current per Phase | 5 A continuous - enables high-power rail delivery with minimal thermal derating in WLCSP |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with Li-ion battery packs and intermediate bus supplies |
| Output Voltage Range | 0.3 V to 2.0 V (configurable via I²C) - supports core, I/O, and memory rails for AI processors |
| Switching Frequency | 2 MHz to 6 MHz - allows use of sub-1 µH inductors and reduces solution size |
| System Accuracy | ±0.7% over temperature - ensures stable operation for voltage-sensitive SoCs without margining |
| Efficiency Peak | 94.7% at 3.8 VIN/1.8 VOUT - minimizes heat generation in thermally constrained modules |
| Package | 54-ball WLCSP, 2.551 mm × 3.670 mm, 0.4 mm pitch - ultra-compact footprint for mobile PCBs |
Pinout & Package
ISL91211BIK-REFZ uses a 54-ball, 6×9 WLCSP package with 0.4 mm pitch and balls-down orientation (JEDEC standard). Pin assignments are fixed per datasheet Figure 1.4 and Table 1.5, supporting dedicated PVIN, PH, RTN, and PGND connections per power stage plus digital I/Os.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PH_A, PH_B, PH_C, PH_D | Switching node outputs | Each drives one buck phase; PH_A → VOUT2, PH_B → VOUT3, PH_C → VOUT4, PH_D → VOUT1 |
| VOUT1–VOUT4 | Output voltage sense inputs | Direct connection to regulated rail; enables precise closed-loop feedback for each output |
| RTN1–RTN4 | Remote ground sense inputs | Compensates for PCB IR drop - critical for <1% accuracy at high current |
| PVIN_A–PVIN_D | Independent power stage inputs | Allows localized input filtering per phase; improves noise isolation and EMI performance |
| MPIO0–MPIO3, GPIO0–GPIO2 | Configurable digital I/Os | Support I²C/SPI, PGOOD, DVS, or enable functions - eliminates need for external logic |
| EN | Master enable input | NMOS-threshold active-low control - simplifies power sequencing with standard logic drivers |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary R5 control architecture | Eliminates external compensation components while delivering <10 µs transient recovery and ±0.7% accuracy |
| Independent Dynamic Voltage Scaling (DVS) | 3 mV/µs slew rate per output - meets aggressive DVFS timing requirements of AI accelerators |
| Integrated high- and low-side MOSFETs | 23 mΩ HS / 9 mΩ LS RDS(ON) - reduces conduction loss and enables >94% efficiency at 5 A |
| Multi-mode digital interface | I²C (3.4 MHz) or SPI (26 MHz) with pin-selectable mode - supports both firmware flexibility and real-time control |
| Comprehensive fault protection | Dedicated UV/OV/OC/OT detection per buck with latched or auto-retry response - prevents system damage during faults |
| Ultra-small WLCSP footprint | 2.551 mm × 3.670 mm - fits within tight spacing constraints of smartphone and AR/VR PCB layouts |
Applications
| Client SSD Power Delivery | AI Processor Core Rail |
|---|---|
|
Use Scenario: Powering NVMe SSD controller and NAND flash with independent 1.2 V, 1.8 V, 3.3 V, and 1.1 V rails. IC Role / Device Role / Timing Role: Quad-output PMIC providing sequenced, dynamically scaled, and fault-protected voltage domains. Use Value: Enables simultaneous rail startup/shutdown per JEDEC spec, reduces BOM count by integrating four bucks and I²C control in one die. |
Use Scenario: Supplying core, cache, I/O, and memory rails for edge AI SoCs requiring fast DVFS during inference bursts. IC Role / Device Role / Timing Role: High-bandwidth, low-noise quad-buck regulator with 3 mV/µs DVS slew and <10 µs transient response. Use Value: Maintains SoC stability during 50 A/µs load steps while minimizing voltage droop (<±65.5 mV) and eliminating external compensation. |
| AR/VR Display Subsystem | Optical Transceiver Module |
|
Use Scenario: Delivering tightly regulated 0.8 V GPU core, 1.1 V display interface, 1.8 V image sensor, and 3.3 V laser driver rails. IC Role / Device Role / Timing Role: Compact quad-PMIC with remote sensing (RTN1–RTN4) and independent soft-start per output. Use Value: Compensates for trace resistance in thin-film flex interconnects, ensuring <±0.7% accuracy at point-of-load despite 100+ mΩ path resistance. |
Use Scenario: Powering 100G/400G optical module ASICs, TIA, laser diodes, and CDR circuits with strict noise and sequencing requirements. IC Role / Device Role / Timing Role: Low-noise, high-PSRR quad-buck with 2–6 MHz programmable switching and integrated LDO-like regulation. Use Value: Achieves <10 mVpp ripple at 100 kHz–10 MHz, meeting stringent jitter specs for 56 Gbaud PAM4 signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL91211BIIZ-T | Same silicon, production-grade WLCSP with tape-and-reel packaging; identical electrical specs and pinout | Designed for volume manufacturing - lacks onboard test points, debug headers, or preloaded firmware | Select ISL91211BIIZ-T for production deployment after ISL91211BIK-REFZ validation |
| ISL91301B | 42-ball WLCSP, 4 A per phase, triple output (1+1+1+1 not supported); lower integration, no R5 control | Suitable for cost-sensitive, lower-current applications where 5 A/phase and ultra-fast transient response are not required | Choose ISL91301B only if design tolerates reduced current capability and slower load-step recovery (>20 µs) |
Compared with ISL91211BIK-REFZ, the ISL91211BIIZ-T offers identical performance in production form factor, while ISL91301B trades peak current, control bandwidth, and feature set for lower unit cost and smaller package - making it viable only for non-demanding quad-rail systems.
Availability
ISL91211BIK-REFZ is available at Aetrix Electronics and suitable for client SSD development, AI processor evaluation, AR/VR subsystem prototyping requiring stable component supply, full documentation access, and engineering support.
Supply support for ISL91211BIK-REFZ 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 is a global semiconductor leader specializing in microcontrollers, analog power, and connectivity solutions for automotive, industrial, and data infrastructure markets.
The ISL91211B product line delivers highly integrated, high-efficiency PMICs targeting mobile, AI, and optical communication systems where small size, fast transient response, and multi-rail programmability are essential.
FAQ
What is the primary function of the ISL91211BIK-REFZ?
The ISL91211BIK-REFZ is a quad-output, 4-phase programmable PMIC evaluation reference board based on the ISL91211B IC. It provides engineers with a fully populated, tested platform to validate 1+1+1+1 phase configuration, I²C/SPI register access, dynamic voltage scaling, and fault response behavior before committing to custom PCB design. The ISL91211BIK-REFZ includes all necessary passive components, test points, and jumper options for rapid characterization of the ISL91211B device.
Does the ISL91211BIK-REFZ support both I²C and SPI interfaces?
Yes, the ISL91211BIK-REFZ supports both I²C and SPI communication through its onboard ISL91211B IC, which features configurable MPIO pins. The default factory pin mode (0x0) enables concurrent I²C (SCL/SDA on GPIO0/GPIO1) and SPI (SCK/SS_B/MOSI/MISO on MPIO0–MPIO3) access. Users can reconfigure pin modes via I²C writes to the IO_PINMODE register to prioritize one interface or assign pins to DVS, PGOOD, or enable functions - all verified on the ISL91211BIK-REFZ board.
Can the ISL91211BIK-REFZ be used to evaluate dynamic voltage scaling (DVS)?
Yes, the ISL91211BIK-REFZ fully supports DVS evaluation with a guaranteed 3 mV/µs slew rate per output. It includes dedicated DVS command inputs (via MPIOs or I²C registers), onboard oscilloscope test points for VOUT and load current, and preconfigured firmware examples in UG116 that demonstrate 0.5 V ↔ 1.1 V transitions under 5 A load. The ISL91211BIK-REFZ validates real-time DVS timing compliance for AI and mobile SoCs without requiring custom code development.
What protection features are validated on the ISL91211BIK-REFZ?
The ISL91211BIK-REFZ validates all key protection features of the ISL91211B IC: overvoltage (OV), undervoltage (UV), overcurrent (OC), and overtemperature (OT) detection per buck channel. Each fault triggers an interrupt (INT pin) and can be configured for latch-off or auto-retry recovery. The board includes current-sense resistors, thermal pads, and jumpers to inject controlled faults - enabling direct measurement of OC trip thresholds (±10% tolerance), OT shutdown at 143–162°C, and UVLO hysteresis (2.29 V to 2.65 V) on the ISL91211BIK-REFZ.
Is the ISL91211BIK-REFZ pin-compatible with other ISL91211 family boards?
No, the ISL91211BIK-REFZ is not pin-compatible with production variants like ISL91211BIIZ-T because it is an evaluation board - not a packaged IC. However, its underlying ISL91211B die matches the 54-ball WLCSP footprint, pinout, and electrical interface of ISL91211BIIZ-T and ISL91211AIIZ-T. All signal routing, power staging, and I/O definitions on the ISL91211BIK-REFZ directly reflect the ISL91211B datasheet, ensuring layout and firmware developed on the ISL91211BIK-REFZ transition seamlessly to production designs using ISL91211BIIZ-T.
ISL91211BIK-REFZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- Main Purpose:
- DC/DC, Step Down
- Outputs and Type:
- 4 Non-Isolated Outputs
- Voltage - Output:
- -
- Current - Output:
- -
- Voltage - Input:
- -
- Regulator Topology:
- -
- Frequency - Switching:
- Buck
- Contents:
- -
- Utilized IC / Part:
- Board(s)
- Power - Output:
- ISL91211B
ISL91211BIK-REFZ FAQ
1.How can I place an order for ISL91211BIK-REFZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91211BIK-REFZ 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 ISL91211BIK-REFZ reliable?
The price and inventory of ISL91211BIK-REFZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91211BIK-REFZ is usually 5 days.
3.What payment methods are accepted for ISL91211BIK-REFZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91211BIK-REFZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91211BIK-REFZ?
ISL91211BIK-REFZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91211BIK-REFZ 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 ISL91211BIK-REFZ?
For technical support, including ISL91211BIK-REFZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91211BIK-REFZ requirements.
6.How does Aetrix verify that ISL91211BIK-REFZ is sourced from the original manufacturer or authorized distributors?
All ISL91211BIK-REFZ 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 ISL91211BIK-REFZ meets industry standards.
7.What is the process for return or replacement of ISL91211BIK-REFZ?
All ISL91211BIK-REFZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL91211BIK-REFZ, 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 ISL91211BIK-REFZ part is unused and in its original packaging.
Return procedure for ISL91211BIK-REFZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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