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Renesas ISL91212BIIZ-T
- Part No.:
- ISL91212BIIZ-T
- Manufacturer:
- Renesas
- Package:
- 35-WFBGA, WLCSP
- Datasheet:
-
ISL91212BIIZ-T.pdf
- Description:
- IC REG BUCK PROG 5A QUAD 35WLCSP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL91212BIIZ-T from Renesas is a quad-output, four-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-based Dynamic Voltage Scaling (DVS) across all four outputs, operates from 2.5V–5.5V input, and integrates low-RDS(ON) MOSFETs (23mΩ HS / 9mΩ LS) for compact 7×10mm² designs.
For engineers reviewing the ISL91212BIIZ-T datasheet, ISL91212BIIZ-T pinout, ISL91212BIIZ-T application, or ISL91212BIIZ-T equivalent, key selection criteria include its 1+1+1+1 single-phase output configuration, ±0.7% system output accuracy with remote sensing, 4MHz switching frequency, programmable 0.3V–2.0V output range per rail, and robust fault protection (UV/OV/OC/OT) with interrupt signaling.
Technical Context
The ISL91212BIIZ-T implements Renesas' proprietary R5 control architecture, enabling ultra-fast transient response (e.g., 50A/µs per phase), seamless DCM/CCM transitions without external compensation, and tight load regulation. Its four independent buck controllers are reconfigurable into a true quad-single-phase topology-each phase assigned to one dedicated output (VOUT1–VOUT4)-with separate remote sense inputs (RTN1–RTN4) and dedicated power stage pins (PH_A–PH_D).
It features dual GPIOs (I²C SCL/SDA) and three MPIOs supporting multiple pin-mode configurations-including individual PGOOD outputs, global or per-buck DVS control, and register pass-through-enabling flexible system-level integration without additional logic. The device uses internal bandgap reference and chip temperature sensing for autonomous thermal management and accurate voltage regulation under varying load and thermal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Quad output (1+1+1+1 single-phase), each with independent VOUT/RTN pair and PH node |
| Max Output Current | 5A per phase continuous, enabling 5A per rail at full load |
| Input Voltage Range | 2.5V–5.5V on AVIN/PVIN rails, compatible with Li-ion battery and intermediate bus supplies |
| Output Voltage Range | 0.3V–2.0V per rail (programmable via 10-bit I²C interface with 1.2–2.0mV step size) |
| Switching Frequency | Programmable 2MHz–6MHz CCM operation; typical 4MHz for optimal efficiency/size trade-off |
| Output Accuracy | ±0.7% over –10°C to +85°C with remote sensing, ensuring stable core voltage under load transients |
| Protection Features | UV/OV/OC/OT detection with interrupt assertion and automatic shutdown; thermal shutdown at 143–162°C |
Pinout & Package
ISL91212BIIZ-T is housed in a 2.551mm × 3.67mm, 35-ball WLCSP package with 0.5mm pitch, optimized for ultra-compact PCB layouts in smartphones and AI accelerators.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT1–VOUT4 | Remote output voltage sense inputs | Enable precise regulation by connecting directly to load point; RTN1–RTN4 provide corresponding remote ground references |
| PH_A–PH_D | Power stage switching nodes | Each drives one external inductor; PH_A → VOUT2, PH_B → VOUT2, PH_C → VOUT4, PH_D → VOUT1 (per datasheet Figure 4) |
| PVIN_A–PVIN_D | Phase-specific input power supplies | Allow independent input routing per buck stage to minimize noise coupling and improve PSRR |
| GPIO0/GPIO1 | I²C interface pins | Function as SCL and SDA; support up to 3.4MHz I²C communication for real-time DVS and register access |
| MPIO0–MPIO2 | Multipurpose I/Os | Configurable via IO_PINMODE register for PGOOD outputs, DVS control, or system GPIO expansion |
| INT | Open-drain interrupt output | Asserts on fault events (OV/UV/OC/OT); requires external pull-up for host MCU notification |
Key Features
| Feature | Design Value |
|---|---|
| R5 Control Architecture | Eliminates need for external compensation components while delivering <10µs load transient recovery and <±0.7% output error |
| Independent DVS per Output | Enables dynamic core voltage scaling for AI processors and SoCs-each of four rails adjusted independently via I²C commands |
| Low-RDS(ON) Integrated FETs | 23mΩ high-side and 9mΩ low-side MOSFETs reduce conduction loss and enable use of smaller inductors (e.g., 220nH) |
| Diode Emulation & Pulse Skipping | Extends battery life in light-load conditions by reducing quiescent current to <1µA per enabled buck in DCM mode |
| Robust Fault Protection | Dedicated UV/OV/OC/OT monitoring per buck with latched or auto-retry behavior configurable via registers |
Applications
| Smartphones | AI Processors |
|---|---|
Use Scenario: Powering multi-core application processors and memory subsystems in flagship smartphones with strict thermal and area constraints. IC Role / Device Role / Timing Role: Quad-rail PMIC providing independent, dynamically scaled voltages to CPU, GPU, NPU, and LPDDR interfaces. Use Value: Enables 5A per rail delivery in <7×10mm² footprint with ±0.7% accuracy, reducing voltage margining and improving energy efficiency during burst workloads. | Use Scenario: Supplying heterogeneous compute units (e.g., tensor cores, inference accelerators) requiring rapid, coordinated voltage transitions. IC Role / Device Role / Timing Role: I²C-programmable quad-buck controller executing synchronized DVS sequences across four independent power domains. Use Value: Achieves 3mV/µs slew rate per rail with <10µs transient recovery, minimizing voltage droop during AI workload shifts and extending silicon lifetime. |
| Optical Transceiver Modules | Client SSDs |
Use Scenario: Delivering tightly regulated bias and supply voltages to high-speed laser drivers, TIAs, and DSPs in 400G/800G optical modules. IC Role / Device Role / Timing Role: Precision quad-output regulator with remote sensing and low-noise operation for analog front-end stability. Use Value: ±0.7% system accuracy and <5.5mV error below 0.6V ensure signal integrity in 56Gbps PAM4 links, reducing bit error rates. | Use Scenario: Powering NVMe SSD controllers, DRAM buffers, and NAND flash in thin client and enterprise storage devices. IC Role / Device Role / Timing Role: Compact, high-efficiency PMIC managing VDDQ, VDDP, core, and I/O rails with sequencing and fault reporting. Use Value: 94.7% peak efficiency at 3.8VIN/1.8VOUT reduces thermal load in sealed enclosures, enabling fanless SSD designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL91212AIIZ-T | Triple-output (2+1+1 phase) variant; shares same pinout, package, and register map but lacks VOUT4/RTN4 and PH_C functionality | Targeted for triple-rail systems (e.g., CPU+GPU+memory) without fourth domain; cannot support quad-rail DVS | Select only if design requires exactly three regulated outputs and benefits from higher per-rail current capability in dual-phase mode |
| ISL91302BIIZ-T | 54-ball WLCSP, 0.4mm pitch; supports dual-output (3+1 or 2+2 phase) with 5A max per phase but no quad-single-phase mode | Designed for higher-current dual-rail applications (e.g., AI SoC core + I/O) where quad-rail flexibility is unnecessary | Choose when >5A per rail is required or when board layout allows larger 6×9mm package; not drop-in compatible due to pin count/pitch mismatch |
Compared with ISL91212AIIZ-T, the ISL91212BIIZ-T adds a fourth independent buck channel with full DVS and sensing-critical for AI SoCs needing granular voltage control across four domains-while ISL91302BIIZ-T trades quad flexibility for higher per-phase current and different phase allocation schemes in a physically incompatible package.
Availability
ISL91212BIIZ-T is available at Aetrix Electronics and suitable for smartphones, AI processors, optical transceiver modules, and client SSDs requiring stable component supply, long-term lifecycle support, and RoHS-compliant WLCSP packaging.
Supply support for ISL91212BIIZ-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 is a global semiconductor leader specializing in microcontrollers, analog power management, and embedded solutions for automotive, industrial, and computing markets.
The ISL91212B belongs to Renesas' high-density, multi-phase PMIC product line designed specifically for advanced mobile and AI processors demanding ultra-small footprints, fast transient response, and I²C-based dynamic voltage scaling across multiple power domains.
FAQ
What is the maximum output current per rail supported by the ISL91212BIIZ-T?
The ISL91212BIIZ-T supports up to 5A continuous output current per phase, and since it is configured as a true quad-single-phase device (1+1+1+1), each of its four outputs-VOUT1 through VOUT4-can deliver up to 5A independently. This is enabled by its four dedicated buck controllers and integrated low-RDS(ON) MOSFETs (23mΩ HS / 9mΩ LS), verified across the full 2.5V–5.5V input range per the FN8962 datasheet.
Does the ISL91212BIIZ-T support Dynamic Voltage Scaling (DVS) on all four outputs?
Yes, the ISL91212BIIZ-T supports independent Dynamic Voltage Scaling on all four outputs via its I²C interface. Each rail's voltage can be programmed from 0.3V to 2.0V in fine steps (1.2–2.0mV depending on range), with a typical slew rate of 3mV/µs. The device's IO_PINMODE register allows configuration for full per-buck DVS control using MPIO pins or centralized I²C-based updates-confirmed in Table 2 and Section 5.4 of the FN8962 datasheet.
What package type and pin count does the ISL91212BIIZ-T use?
The ISL91212BIIZ-T uses a 35-ball Wafer-Level Chip-Scale Package (WLCSP) measuring 2.551mm × 3.67mm with 0.5mm ball pitch. This RoHS-compliant package is specified in the Ordering Information table (Page 5) and Package Outline Drawing (Page 51) of FN8962 Rev. 1.00, and is shared with the ISL91212AIIZ-T-though pin functions differ to support the fourth output.
How does the ISL91212BIIZ-T handle overtemperature and overcurrent faults?
The ISL91212BIIZ-T integrates comprehensive protection: overtemperature shutdown triggers between 143°C and 162°C with 55°C hysteresis, while overcurrent protection activates at 8A per phase (±10% tolerance) with configurable latch or retry behavior. Faults are reported via the open-drain INT pin and accessible through I²C status registers-details confirmed in Sections 6 and 7 of FN8962, including thermal resistance (θJA = 43°C/W) and OC threshold accuracy.
Can the ISL91212BIIZ-T operate with a 1.8V I/O supply while using a 3.8V input voltage?
Yes, the ISL91212BIIZ-T supports independent I/O and power supply domains: VIO (1.7V–1.8V) powers the digital interface including I²C and GPIOs, while PVIN/AVIN (2.5V–5.5V) supplies the analog and power stages. This separation allows reliable 1.8V I²C communication even with 3.8V input-verified in Section 2.3 (Recommended Operating Conditions) and Table 11 (I²C timing) of FN8962, where VIO = 1.8V is explicitly tested at 3.8VIN.
ISL91212BIIZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 35-WFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 4
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.3V
- Voltage - Output (Max):
- 10V
- Current - Output:
- 5A
- Frequency - Switching:
- 2MHz ~ 6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 35-WLCSP (2.55x3.67)
ISL91212BIIZ-T FAQ
1.How can I place an order for ISL91212BIIZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91212BIIZ-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 ISL91212BIIZ-T reliable?
The price and inventory of ISL91212BIIZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91212BIIZ-T is usually 5 days.
3.What payment methods are accepted for ISL91212BIIZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91212BIIZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91212BIIZ-T?
ISL91212BIIZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91212BIIZ-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 ISL91212BIIZ-T?
For technical support, including ISL91212BIIZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91212BIIZ-T requirements.
6.How does Aetrix verify that ISL91212BIIZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91212BIIZ-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 ISL91212BIIZ-T meets industry standards.
7.What is the process for return or replacement of ISL91212BIIZ-T?
All ISL91212BIIZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91212BIIZ-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 ISL91212BIIZ-T part is unused and in its original packaging.
Return procedure for ISL91212BIIZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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