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Renesas ISL91211BIKZ-T
- Part No.:
- ISL91211BIKZ-T
- Manufacturer:
- Renesas
- Package:
- 54-UFBGA, WLCSP
- Datasheet:
-
ISL91211BIKZ-T.pdf
- Description:
- IC REG BUCK PROG 5A QUAD 54WLCSP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL91211BIKZ-T from Renesas is a quad-output, 4-phase programmable PMIC optimized for high-efficiency synchronous buck conversion in space-constrained mobile and AI processor power systems. It delivers up to 5A per phase, supports I²C/SPI configuration, features ±0.7% system output accuracy with remote sensing, and operates from 2.5V–5.5V input to programmable 0.3V–2.0V outputs - enabling dynamic voltage scaling for AI accelerators and smartphone SoCs.
For engineers reviewing the ISL91211BIKZ-T datasheet, ISL91211BIKZ-T pinout, ISL91211BIKZ-T application, or ISL91211BIKZ-T equivalent, this page provides verified pin functions, confirmed quad 1+1+1+1 phase configuration, real-world efficiency data (94.7% at 3.8VIN/1.8VOUT), R5 control architecture transient response specs, and validated alternatives for multi-rail SoC power delivery.
Technical Context
The ISL91211BIKZ-T implements Renesas' proprietary R5 control architecture across four independent buck controllers, enabling ultra-fast load transient response (50A/µs per phase) and seamless DCM/CCM transitions without external compensation. Its reconfigurable power stage mapping supports flexible 1+1+1+1 phase assignment per output, with integrated low-RDS(ON) MOSFETs (23mΩ HS / 9mΩ LS).
It integrates four MPIOs and three GPIOs supporting I²C (up to 3.4MHz) or SPI (up to 26MHz) communication, programmable PWM frequency (2–6MHz), automatic diode emulation, and pulse-skipping modes - all managed via register-based configuration including independent DVS per output and precise fault detection (UV/OV/OC/OT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Quad output, 1+1+1+1 phase - each output independently configurable for dedicated rail delivery (e.g., core, GPU, memory, I/O). |
| Per-Phase Current | 5A continuous - enables compact, high-density power delivery with minimal external components. |
| Input Voltage Range | 2.5V–5.5V - compatible with single-cell Li-ion (3.0–4.2V) and USB PD (5V) input sources. |
| Output Voltage Range | 0.3V–2.0V (programmable in 1.2–2.0mV steps) - supports modern low-voltage AI/SoC cores and peripherals. |
| System Accuracy | ±0.7% over –40°C to +85°C with remote sensing - ensures stable operation under thermal and load variation. |
| Switching Frequency | 2MHz–6MHz (programmable) - allows optimization of inductor size vs. efficiency trade-off. |
| Efficiency | 94.7% at 3.8VIN/1.8VOUT, 1-phase - reduces thermal load and extends battery life in portable devices. |
Pinout & Package
Package: 2.551mm × 3.67mm, 54-ball WLCSP with 0.4mm pitch - designed for ultra-thin mobile PCBs and high-density BGA layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT1–VOUT4 | Output voltage sense inputs | Enable remote feedback for precise regulation; VOUT4 and RTN4 are active only on ISL91211B (not shorted). |
| PH_A–PH_D | Power stage switching nodes | Four dedicated high-frequency switch nodes - assigned one-to-one to each output in 1+1+1+1 mode. |
| RTN1–RTN4 | Remote ground sense inputs | Compensate for PCB IR drop; RTN4 is functional only on ISL91211B for fourth rail monitoring. |
| MPIO0–MPIO3 | Multipurpose I/O pins | Configurable as I²C/SPI signals or DVS/PGOOD pins - support factory-programmed pin modes (e.g., 0x7 for 1-pin DVS per buck). |
| GPIO0–GPIO2 | General-purpose I/O | Support I²C clock/data (default mode) or hardware enable/DVS control - provide flexible system-level interface options. |
| EN | Master chip enable | NMOS logic threshold input - controls global startup/shutdown sequencing with internal soft-start. |
| WDOG_RST | Watchdog reset input | Digital reset signal that forces all bucks to default output voltages - enhances system reliability during firmware recovery. |
Key Features
| Feature | Design Value |
|---|---|
| R5 Control Architecture | Eliminates need for external compensation components while delivering <10µs transient response and tight load regulation. |
| Independent Dynamic Voltage Scaling | Each of four outputs supports programmable slew rate (3mV/µs) and voltage step size (1.2–2.0mV) for adaptive SoC power management. |
| Integrated Power Stages | On-die 23mΩ high-side and 9mΩ low-side MOSFETs reduce solution size and improve efficiency vs. controller-only PMICs. |
| Light-Load Efficiency Modes | Automatic diode emulation and pulse-skipping extend battery runtime in standby and idle states. |
| Fault Protection Suite | Detects and responds to UV/OV/OC/OT faults with latched or auto-retry behavior - configurable per rail via registers. |
Applications
| Smartphone Application | AI Accelerator Power |
|---|---|
|
Use Scenario: Multi-rail power delivery for application processor (AP), GPU, memory, and modem subsystems in flagship smartphones. IC Role / Device Role: Quad-output PMIC providing independent, dynamically scaled voltages to AP core (VOUT1), GPU (VOUT2), LPDDR4/5 (VOUT3), and I/O (VOUT4). Use Value: Enables simultaneous 1+1+1+1 phase operation with <±0.7% accuracy and 94.7% peak efficiency - reducing thermal density and extending battery life. |
Use Scenario: Powering heterogeneous AI inference chips requiring rapid, coordinated voltage changes across multiple voltage domains. IC Role / Device Role: Configurable quad-buck regulator supporting independent DVS timing and slew rates per rail to match neural network layer execution profiles. Use Value: 3mV/µs DVS slew rate and 50A/µs transient capability ensure stable supply during burst-mode compute workloads. |
| Optical Transceiver Module | Enterprise SSD Controller |
|
Use Scenario: Compact, high-efficiency power for 100G/400G optical modules with tight thermal and board-area constraints. IC Role / Device Role: Supplies bias rails for laser drivers (VOUT1), TIAs (VOUT2), DSPs (VOUT3), and SerDes (VOUT4) from a single 3.3V or 5V input. Use Value: 2.55mm × 3.67mm WLCSP package fits within module edge zones; 2–6MHz programmable frequency avoids EMI-sensitive bands. |
Use Scenario: Power management for NVMe SSD controllers and NAND flash interfaces in client and enterprise storage systems. IC Role / Device Role: Delivers tightly regulated 1.0V (core), 1.2V (PCIe PHY), 1.8V (I/O), and 3.3V (auxiliary) rails using external resistive dividers on VOUT pins. Use Value: ±0.7% system accuracy and remote sensing maintain compliance with JEDEC SSD voltage tolerance specs under varying load and temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL91211AIKZ-T | Triple-output (2+1+1 phase), same 54-ball WLCSP package and pinout - VOUT4/RTN4 internally shorted to GND. | Used where only three regulated rails are required; lacks fourth independent output capability. | Select when system design does not require quad-rail support - retains identical layout, firmware, and thermal profile. |
| ISL91301BIKZ-T | Quad-output (1+1+1+1), but 42-ball 6×7 WLCSP, 4A per phase, lower integration (external MOSFETs required). | Suitable for cost-sensitive or thermally less demanding designs where 5A/phase is not needed. | Choose for legacy designs using ISL91301B footprint or where lower current rating suffices - requires redesign of power stage layout. |
Compared with ISL91211BIKZ-T, ISL91211AIKZ-T shares identical pinout and firmware compatibility but omits the fourth rail, while ISL91301BIKZ-T trades current capability and integration for smaller package size and lower cost - making it suitable for mid-tier SSD or IoT applications.
Availability
ISL91211BIKZ-T is available at Aetrix Electronics and suitable for smartphone SoC power, AI accelerator boards, optical transceiver modules, and enterprise SSDs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL91211BIKZ-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 connectivity solutions for automotive, industrial, and infrastructure markets.
The ISL91211B belongs to Renesas' high-density, multi-phase PMIC product line - engineered specifically for advanced mobile and AI processors requiring ultra-small form factor, fast transient response, and software-configurable power rails.
FAQ
What is the maximum continuous output current per phase for the ISL91211BIKZ-T?
The ISL91211BIKZ-T supports up to 5A continuous output current per phase across all four power stages. This rating is specified for 2.5V–5.5V input voltage range and applies to each of the four independent buck regulators in its 1+1+1+1 configuration. The device achieves this with integrated 23mΩ high-side and 9mΩ low-side MOSFETs, enabling high efficiency without external power switches.
Does the ISL91211BIKZ-T support both I²C and SPI communication interfaces?
Yes, the ISL91211BIKZ-T supports both I²C (up to 3.4MHz) and SPI (up to 26MHz) communication through its MPIO and GPIO pins. Pin functionality is configurable via the IO_PINMODE register - for example, mode 0x0 enables simultaneous I²C clock/data on GPIO0/GPIO1 and SPI signals on MPIO0–MPIO3. This dual-interface flexibility simplifies integration into diverse host controller ecosystems.
How does the ISL91211BIKZ-T implement Dynamic Voltage Scaling (DVS)?
The ISL91211BIKZ-T supports independent DVS on all four outputs with programmable slew rate (3mV/µs typical) and voltage step resolution (1.2–2.0mV). DVS can be triggered via I²C register writes or dedicated GPIO/MPIO pins configured in pin modes like 0x7 (1-pin DVS per buck) or 0x5 (full pin-controlled DVS for BUCK1/BUCK2). Each buck's DVS behavior is isolated, preventing cross-rail interference during voltage transitions.
What package type and dimensions does the ISL91211BIKZ-T use?
The ISL91211BIKZ-T uses a 54-ball Wafer-Level Chip-Scale Package (WLCSP) measuring 2.551mm × 3.67mm with 0.4mm ball pitch. It is RoHS-compliant and rated MSL3 per J-STD-020. The package integrates solder balls with SnAgCu e6 composition, ensuring compatibility with both SnPb and Pb-free reflow profiles - critical for high-yield manufacturing in mobile and AI hardware.
Can the ISL91211BIKZ-T be used in place of the ISL91211AIKZ-T without PCB changes?
No - while the ISL91211BIKZ-T and ISL91211AIKZ-T share identical 54-ball WLCSP packaging and pinout, their functional pin assignments differ: VOUT4 and RTN4 are active and electrically isolated on the ISL91211BIKZ-T but internally shorted to GND on the ISL91211AIKZ-T. Using ISL91211BIKZ-T in an ISL91211AIKZ-T layout risks incorrect fourth-rail regulation unless the PCB is modified to route VOUT4/RTN4 appropriately.
ISL91211BIKZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 54-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 2V
- Current - Output:
- 5A
- Frequency - Switching:
- 2MHz ~ 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 54-WLCSP (2.55x3.67)
ISL91211BIKZ-T FAQ
1.How can I place an order for ISL91211BIKZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL91211BIKZ-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 ISL91211BIKZ-T reliable?
The price and inventory of ISL91211BIKZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL91211BIKZ-T is usually 5 days.
3.What payment methods are accepted for ISL91211BIKZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL91211BIKZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL91211BIKZ-T?
ISL91211BIKZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL91211BIKZ-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 ISL91211BIKZ-T?
For technical support, including ISL91211BIKZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL91211BIKZ-T requirements.
6.How does Aetrix verify that ISL91211BIKZ-T is sourced from the original manufacturer or authorized distributors?
All ISL91211BIKZ-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 ISL91211BIKZ-T meets industry standards.
7.What is the process for return or replacement of ISL91211BIKZ-T?
All ISL91211BIKZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL91211BIKZ-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 ISL91211BIKZ-T part is unused and in its original packaging.
Return procedure for ISL91211BIKZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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