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Renesas ISL6271ACR
- Part No.:
- ISL6271ACR
- Manufacturer:
- Renesas
- Category:
- Power Management - Specialized
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL6271ACR.pdf
- Description:
- IC REG PMIC 1BUCK 2LDO 20-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,264
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Product details
Overview
ISL6271ACR from Renesas Electronics (formerly Intersil) is a power management IC (PMIC) integrating one synchronous buck regulator and two low-dropout linear regulators for Intel XScale processor core, SRAM, and PLL power domains. It supports Dynamic Voltage Management (DVM) via I²C or 4-bit VID interface, delivers up to 800mA core current, operates from 2.76V–5.5V input, and features overcurrent/overtemperature/undervoltage protection. It is used in battery-powered handheld computing systems requiring adaptive core voltage scaling.
For engineers reviewing the ISL6271ACR datasheet, ISL6271ACR pinout, ISL6271ACR application, or ISL6271ACR equivalent, key selection considerations include its 0.85V–1.6V programmable core output with 50mV steps, synthetic ripple control topology, 1.2MHz switching frequency, dual-function VID/I²C pins, and 4×4 mm QFN-20 package with exposed thermal pad.
Technical Context
The ISL6271ACR implements a proprietary Synthetic Ripple Regulation (SRR) topology for its buck regulator-eliminating reliance on output capacitor ESR while enabling fast transient response and stable operation across load ranges. Its I²C interface supports standard/fast mode and transmits both 4-bit voltage level (D0–D3) and 2-bit slew rate (D4–D5) commands to the internal DAC.
Two dedicated LDOs provide fixed 1.1V (VSRAM) and 1.3V (VPLL) outputs with independent current limits (120–300% of rated 50mA/40mA), shared enable (EN), and coordinated soft-start. All three regulators monitor output voltage against 86–94% undervoltage and 106–114% overvoltage thresholds with hysteresis, triggering PGOOD fault assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Output Range | 0.85V to 1.6V in 50mV increments; enables precise DVM alignment with XScale frequency states. |
| Max Core Output Current | 800mA DC; sufficient to supply Intel XScale processor core under peak active load. |
| Switching Frequency | 1.2MHz typical; allows use of small 4.7µH inductor and compact 10µF ceramic output capacitor. |
| LDO Outputs | VSRAM = 1.1V / 50mA max; VPLL = 1.3V / 40mA max; optimized for low-noise SRAM and PLL biasing. |
| I²C Interface | Fully compliant with Philips I²C protocol; supports standard (100kHz) and fast (400kHz) modes for real-time DVM updates. |
| Input Voltage Range | PVCC/VCC: 2.76V–5.5V; compatible with single-cell Li-ion (3.0–4.2V) and regulated system rails. |
| Thermal Protection | Thermal shutdown at 130°C–150°C rising; hysteresis resets at 85°C–105°C falling for safe recovery. |
Pinout & Package
ISL6271ACR is housed in a 20-lead, 4×4 mm QFN package (JEDEC MO-220 compliant) with exposed thermal pad for enhanced PCB heat dissipation. Pin numbering follows top-view layout with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVCC | Main input to buck regulator | Accepts 2.76V–5.5V battery or adapter input; powers high-side PMOS switch and gate drive. |
| VOUT | Buck regulator output | Delivers programmable core voltage (0.85V–1.6V); connects directly to XScale VCC_VCORE pin. |
| PHASE | Switching node | Drives external inductor; requires low-inductance routing and snubber resistor (50Ω) for EMI control. |
| VIDEN | Interface mode select | Low = enable I²C; high = enable 4-bit VID pins (SCL/VID0, SDA/VID1, VID2, VID3). |
| EN | Global enable | Active-high logic (VIH ≥ 2.0V); disables all regulators and enters 2–5µA quiescent state. |
| PGOOD | Open-drain status flag | Pulled low if any regulator (VOUT/VSRAM/VPLL) is out-of-tolerance; requires external pull-up. |
| BFLT# | Battery fault indicator | Actively pulled low when main battery <2.6V; powered by BBAT during battery absence. |
Key Features
| Feature | Design Value |
|---|---|
| Synthetic Ripple Regulation (SRR) | Proprietary hysteretic-derived control eliminating ESR dependency; ensures stability with low-ESR ceramic capacitors. |
| Diode emulation mode | Enables discontinuous conduction at light loads; improves efficiency below ~100mA without external diode. |
| Programmable slew rate | Four selectable rates (0.5–5 mV/µs) via I²C D4–D5 bits; prevents overshoot during DVM transitions. |
| Integrated soft-start | Controlled by external capacitor on SOFT pin; default ramp time ~1.3ms to 1.3V with 10nF. |
| Shared fault protection | Overcurrent, overtemperature, and UV/OV detection applied to all three regulators; coordinated PGOOD assertion. |
Applications
| Mobile Handheld Computing | Embedded XScale Systems |
|---|---|
Use Scenario: Power management in PDAs and early smartphones using Intel XScale processors with dynamic frequency scaling. IC Role / Device Role / Timing Role: Primary PMIC delivering adaptive core voltage (VCC_VCORE), low-noise SRAM bias (VCC_SRAM), and PLL supply (VCC_PLL). Use Value: Enables battery life extension via DVM-reducing core voltage during low-compute states while maintaining full performance when needed. | Use Scenario: Compact industrial or medical handheld terminals requiring robust, integrated power sequencing. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete buck + dual-LDO designs; provides synchronized enable, soft-start, and fault reporting. Use Value: Reduces BOM count and PCB area versus discrete solutions while ensuring rail coordination critical for XScale boot integrity. |
| Tablet Devices | Processor Reference Platforms |
Use Scenario: Early-generation tablet PCs where space-constrained layouts demand high integration. IC Role / Device Role / Timing Role: Central power controller managing core, memory, and clock domain supplies with I²C-based runtime reconfiguration. Use Value: Supports rapid voltage transitions (<100µs slew with 47µA SOFT current) required for XScale's aggressive power-state changes. | Use Scenario: Evaluation and development platforms for XScale-based SoC designs. IC Role / Device Role / Timing Role: Reference power delivery IC on customer reference boards (CRBs) and evaluation kits per AN1139. Use Value: Provides validated layout, compensation (RCOMP = 50kΩ), and component selection (4.7µH/10µF) accelerating design-in. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6271CRZ | Same die, but non-A version; lacks updated DVM timing specs and tighter output accuracy (±2% vs ±1% at room temp). | Not qualified for new XScale designs requiring latest Intel-defined DVM slew compliance. | Select ISL6271ACR for production designs targeting full FN9171 Rev 2.00 specification compliance. |
| RT8059GQW | Single-buck + dual-LDO PMIC with 600mA core current, 0.7V–1.5V range, and I²C interface-but no VID pin fallback mode. | Requires firmware-only DVM control; lacks hardware VID option for bootloader-level voltage setting. | Choose RT8059GQW only if I²C-only control suffices and 800mA core current headroom is not required. |
Compared with ISL6271CRZ, the ISL6271ACR offers tighter system accuracy and updated DVM timing; compared with RT8059GQW, it adds VID pin compatibility and higher core current, making it uniquely suited for legacy XScale platforms requiring hardware/firmware flexibility.
Availability
ISL6271ACR is available at Aetrix Electronics and suitable for mobile handheld computing, embedded XScale systems, and tablet devices requiring stable component supply with long-term lifecycle support.
Supply support for ISL6271ACR 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 maintains full technical and supply chain continuity for legacy Intersil PMICs including the ISL6271A family.
The ISL6271ACR belongs to Intersil's Bulverde Power Controller product line, engineered specifically to meet Intel's XScale processor power architecture requirements-including DVM, coordinated rail sequencing, and compact QFN packaging.
FAQ
What is the core output voltage range supported by the ISL6271ACR?
The ISL6271ACR supports a core output voltage range of 0.85V to 1.6V in precise 50mV increments. This range is programmable either via its integrated I²C interface or through four VID input pins (VID0–VID3), enabling direct alignment with Intel XScale processor frequency states and Dynamic Voltage Management requirements.
Does the ISL6271ACR support both I²C and VID programming simultaneously?
No-the ISL6271ACR uses VIDEN pin state to select interface mode: VIDEN low enables I²C communication (SCL/SDA), while VIDEN high enables 4-bit VID control (SCL=VID0, SDA=VID1, VID2, VID3). Both modes cannot operate concurrently; the device functions exclusively in one mode at a time based on VIDEN logic level.
What is the maximum continuous output current capability of the ISL6271ACR's buck regulator?
The ISL6271ACR's synchronous buck regulator delivers up to 800mA of continuous DC output current at the core rail (VOUT). This rating is specified under recommended operating conditions (TA = –25°C to 85°C, PVCC = VCC = 3.7V) and is validated for reliable operation with appropriate thermal design and external components per Figure 19 in FN9171 Rev 2.00.
How does the ISL6271ACR implement thermal protection?
The ISL6271ACR incorporates thermal shutdown with a rising threshold between 130°C and 150°C and hysteresis that resets at 85°C–105°C falling. When junction temperature exceeds the trip point, all regulators disable and PGOOD asserts low. The device remains latched off until temperature falls below the hysteresis threshold, ensuring safe cooldown before automatic recovery.
Can the ISL6271ACR operate with a single-cell Li-ion battery input?
Yes-the ISL6271ACR accepts an input voltage range of 2.76V to 5.5V on PVCC and VCC, fully covering the discharge profile of a single-cell Li-ion battery (typically 3.0V–4.2V). Its proprietary Synthetic Ripple Regulation topology maintains stability and efficiency across this range without requiring high-ESR output capacitors, making it ideal for portable battery-powered XScale systems.
ISL6271ACR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Processor
- Current - Supply:
- 380µA
- Voltage - Supply:
- 2.76V ~ 5.5V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
ISL6271ACR FAQ
1.How can I place an order for ISL6271ACR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6271ACR 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 ISL6271ACR reliable?
The price and inventory of ISL6271ACR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6271ACR is usually 5 days.
3.What payment methods are accepted for ISL6271ACR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6271ACR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6271ACR?
ISL6271ACR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6271ACR 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 ISL6271ACR?
For technical support, including ISL6271ACR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6271ACR requirements.
6.How does Aetrix verify that ISL6271ACR is sourced from the original manufacturer or authorized distributors?
All ISL6271ACR 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 ISL6271ACR meets industry standards.
7.What is the process for return or replacement of ISL6271ACR?
All ISL6271ACR units undergo pre-shipment inspection (PSI). If there is an issue with ISL6271ACR, 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 ISL6271ACR part is unused and in its original packaging.
Return procedure for ISL6271ACR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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