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Renesas ISL6308AIRZ
- Part No.:
- ISL6308AIRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6308AIRZ.pdf
- Description:
- IC REG CTRLR DDR 1OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
ISL6308AIRZ from Renesas (formerly Intersil) is a three-phase buck PWM controller with integrated high-current MOSFET drivers, designed for precision voltage regulation in high-current, low-voltage point-of-load applications. It supports 1-/2-/3-phase operation, delivers ±0.5% system accuracy at 1.2V/1.5V references, features dual DCR/rDS(ON) current sensing for load-line droop and channel balancing, and operates across –40°C to +85°C ambient temperature.
For engineers reviewing the ISL6308AIRZ datasheet, ISL6308AIRZ pinout, ISL6308AIRZ application, or ISL6308AIRZ equivalent, key selection considerations include its 40-lead 6×6 QFN package, selectable 225–275 kHz switching frequency, integrated remote differential sensing, programmable DAC reference (0.6V/0.9V/1.2V/1.5V), and multi-tiered overvoltage/overcurrent protection architecture.
Technical Context
The ISL6308AIRZ implements interleaved three-phase PWM control using a shared sawtooth oscillator and phase-shifted termination signals-PWM2 lags PWM1 by 1/3 cycle, PWM3 lags PWM2 by 1/3 cycle. Its error amplifier drives a comparator referenced against this ramp, with current correction injected via ICOMP to enable real-time per-phase pulse-width adjustment.
Current sensing combines lossless rDS(ON) sampling on ISEN1–ISEN3 for channel-current balance and continuous DCR-based sensing on ISUM/IREF/ICOMP for load-line droop and overcurrent protection. The ENLL enable threshold (0.63 V typical) and adaptive non-overlap timing (10 ns typical) ensure robust gate drive sequencing and shoot-through prevention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Ambient Temp Range | –40°C to +85°C - qualified for industrial and extended-temperature embedded power systems |
| Switching Frequency | 225–275 kHz - set via external FS-to-GND resistor; enables optimized trade-off between efficiency and EMI |
| System Accuracy | ±0.5% at 1.2V/1.5V DAC settings - ensures tight output regulation under thermal and load transients |
| DAC Reference Options | 0.6V / 0.9V / 1.2V / 1.5V - selected via REF0/REF1 TTL inputs; supports DDR, chipset, and FPGA core rails |
| Gate Drive Strength | Upper drive: 1.25–3.0 Ω source / 0.9–3.0 Ω sink; Lower drive: 0.85–2.2 Ω source / 0.6–1.35 Ω sink - drives high-side/lower MOSFETs directly without external buffers |
| Overcurrent Trip | 100 µA at OCSET pin - sets precise OCP threshold via single external resistor; independent of temperature drift |
| Remote Sensing | Differential VSEN/RGND input with 20 MHz bandwidth and ±55 µA bias current - rejects ground noise in high-current PCB layouts |
Pinout & Package
ISL6308AIRZ is housed in a 40-lead, 6 mm × 6 mm, 0.5 mm pitch QFN package (PKG DWG # L40.6x6) with exposed thermal pad. Pin count, layout, and thermal resistance (θJA = 32°C/W, θJC = 3.5°C/W) are identical to ISL6308ACRZ, differing only in temperature grade.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (6) | Bias supply input | +5 V ±5% supply for internal logic and error amplifier; requires local 1 µF ceramic decoupling |
| PVCC1/2/3 (33,24,18) | Per-phase gate drive supply | +5 V to +12 V per channel; tying PVCC2/PVCC3 to GND disables corresponding phases |
| ENLL (37) | Enable control input | 0.63 V typical threshold; enables full controller operation when pulled high; hysteresis improves noise immunity |
| REF0/REF1 (40,39) | DAC reference select | 2-bit TTL interface selecting one of four fixed DAC outputs (0.6V/0.9V/1.2V/1.5V) |
| ISEN1/2/3 (32,25,19) | rDS(ON) current sense inputs | Sample lower-MOSFET conduction current for per-phase current balancing; no external op-amp required |
| UGATE1/2/3 (31,27,20) | Upper gate drive outputs | Direct drive for N-channel high-side MOSFET gates; includes adaptive non-overlap (10 ns) to prevent shoot-through |
| LGATE1/2/3 (34,23,17) | Lower gate drive outputs | Direct drive for synchronous rectifier MOSFETs; fast rise/fall times (18/12 ns typical) minimize conduction losses |
| ISUM/IREF/ICOMP (15,16,13) | DCR current sense interface | Supports lossless inductor DCR sensing for droop programming and overcurrent protection; ICOMP provides filtered droop voltage |
| OVP (38) | Overvoltage protection output | Open-drain signal pulling to VCC during OVP event; drives external SCR/MOSFET crowbar for load protection |
| PGOOD (35) | Power-good indicator | Open-drain status flag signaling soft-start completion and sustained in-spec output voltage (±82–84% VID) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3-phase PWM + gate drivers | Eliminates need for discrete driver ICs; reduces BOM count and layout area in high-current POL designs |
| Dual current sensing (rDS(ON) + DCR) | Enables simultaneous channel-current balance (rDS(ON)) and accurate load-line droop/OC protection (DCR) |
| Programmable DAC reference | Four factory-trimmed reference voltages (0.6V–1.5V) selected via logic pins-no external DAC or resistor divider needed |
| Differential remote voltage sensing | 20 MHz bandwidth amplifier with ±55 µA input bias rejects PCB trace IR drop and ground bounce in >30 A systems |
| Multi-tier overvoltage protection | Clamps output via lower MOSFET turn-on *and* asserts OVP pin to trigger external crowbar-dual-layer load safety |
| Digital soft-start & pre-biased start-up | Prevents inrush current into loaded outputs; supports hot-swap and dynamic voltage scaling in server/FPGA applications |
Applications
| High-Current DDR Memory Regulators | Chipset Core Voltage Supplies |
|---|---|
|
Use Scenario: Regulating 1.2 V/30 A core voltage for DDR4 memory subsystems in enterprise servers and networking equipment. IC Role / Device Role / Timing Role: Three-phase buck controller managing interleaved switching, per-phase current balancing, and precise VID tracking via DAC reference. Use Value: Achieves <±0.5% output accuracy across –40°C to +85°C while reducing output capacitor count by 60% versus single-phase alternatives. |
Use Scenario: Delivering stable 0.9 V/25 A supply to CPU chipset I/O and memory controller logic in industrial PCs and edge AI platforms. IC Role / Device Role / Timing Role: Integrated PWM controller with remote sensing and droop compensation maintaining tight load-line compliance during rapid current transients. Use Value: Dual current sensing ensures <±3% inter-phase current imbalance at full load, extending MOSFET lifetime and reducing thermal hotspots. |
| FPGA Core Power Delivery | ASIC Point-of-Load Converters |
|
Use Scenario: Generating 0.85 V/40 A core rail for high-end Xilinx/Intel FPGAs in test equipment and radar processing units. IC Role / Device Role / Timing Role: High-accuracy, multi-phase regulator supporting dynamic voltage scaling (DVS) via DAC reference reprogramming during operation. Use Value: ±0.8% system accuracy at 0.6 V reference enables reliable low-voltage operation while digital soft-start prevents configuration corruption. |
Use Scenario: Providing 1.5 V/35 A supply to ASIC SoCs in telecom baseband modules requiring high PSRR and low noise. IC Role / Device Role / Timing Role: Precision buck controller with differential remote sensing and OVP crowbar output protecting sensitive analog/RF circuitry. Use Value: 20 MHz remote-sense amplifier bandwidth suppresses high-frequency noise from adjacent RF sections, improving ADC SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6308ACRZ | Identical functionality and pinout; rated for 0°C to +70°C ambient only | Restricted to commercial-temperature environments (e.g., consumer electronics, non-ruggedized computing) | Select ISL6308ACRZ only if operating temperature remains within 0–70°C; ISL6308AIRZ is mandatory for industrial/automotive-adjacent use. |
| MP8765GQ-Z | Monolithic 3-phase controller with integrated power stages; no external MOSFET drivers required | Reduces solution size but limits max output current (<20 A/channel) and thermal design flexibility | Choose MP8765GQ-Z for space-constrained, medium-current designs; ISL6308AIRZ preferred for >30 A, thermally optimized, or discrete-MOSFET-flexible systems. |
Compared with ISL6308ACRZ, the ISL6308AIRZ extends operational reliability to –40°C, enabling deployment in uncontrolled environments; compared with MP8765GQ-Z, it retains full discrete MOSFET control for higher current, better thermal management, and custom gate drive optimization.
Availability
ISL6308AIRZ is available at Aetrix Electronics and suitable for high-current DDR memory regulators, chipset core voltage supplies, and FPGA/ASIC point-of-load converters requiring stable component supply across industrial temperature ranges.
Supply support for ISL6308AIRZ 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 manufacturing continuity for the ISL6308A family. Renesas is a global semiconductor leader focused on microcontrollers, analog, power, and connectivity solutions.
The ISL6308A product line was developed to address high-current, low-voltage DC/DC conversion challenges in server, networking, and high-performance computing-emphasizing integration, accuracy, and thermal resilience in multi-phase POL architectures.
FAQ
What is the maximum supported output voltage for the ISL6308AIRZ?
The ISL6308AIRZ is specified for output voltages not exceeding 2.3 V. Its internal DAC reference options (0.6 V, 0.9 V, 1.2 V, 1.5 V) and error amplifier architecture are optimized for low-voltage, high-current applications such as DDR memory and processor core rails. Attempting to regulate above 2.3 V violates the device's design envelope and may compromise accuracy or protection behavior.
Does the ISL6308AIRZ support single-phase operation?
Yes, the ISL6308AIRZ supports 1-, 2-, or 3-phase operation. Single-phase mode is enabled by grounding both the 2PH and 3PH pins (Pins 2 and 1), or by connecting PVCC2 and PVCC3 to GND. In this configuration, only PHASE1, UGATE1, LGATE1, BOOT1, and ISEN1 are active; remaining channels are disabled internally.
How is overcurrent protection configured on the ISL6308AIRZ?
Overcurrent protection on the ISL6308AIRZ is set using a single external resistor from the OCSET pin (Pin 12) to the ICOMP pin. A nominal 100 µA current flows out of OCSET, generating a reference voltage. When the DCR-sensed voltage at ISUM exceeds this reference, the controller triggers overcurrent shutdown. The trip threshold is highly accurate (±5 mV comparator offset) and temperature-stable.
Can the ISL6308AIRZ be used with an external voltage reference?
Yes, the ISL6308AIRZ accepts an external reference voltage applied directly to the REF pin (Pin 4). The external reference must be between 0.6 V and 1.75 V. When used, the DAC pin (Pin 3) must be left unconnected. The internal DAC is automatically disabled, and regulation follows the externally supplied reference voltage with full system accuracy maintained.
What is the purpose of the DROOP pin on the ISL6308AIRZ?
The DROOP pin (Pin 14) enables or disables load-line (droop) compensation. To enable droop, connect DROOP to ICOMP; to disable it, tie DROOP to IREF. Droop introduces a controlled output voltage decrease proportional to load current, improving transient response and enabling parallel-phase current sharing without master-slave communication.
ISL6308AIRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Controller, DDR
- Voltage - Input:
- 5V ~ 12V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.6V ~ 2.3V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
ISL6308AIRZ FAQ
1.How can I place an order for ISL6308AIRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6308AIRZ 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 ISL6308AIRZ reliable?
The price and inventory of ISL6308AIRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6308AIRZ is usually 5 days.
3.What payment methods are accepted for ISL6308AIRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6308AIRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6308AIRZ?
ISL6308AIRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6308AIRZ 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 ISL6308AIRZ?
For technical support, including ISL6308AIRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6308AIRZ requirements.
6.How does Aetrix verify that ISL6308AIRZ is sourced from the original manufacturer or authorized distributors?
All ISL6308AIRZ 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 ISL6308AIRZ meets industry standards.
7.What is the process for return or replacement of ISL6308AIRZ?
All ISL6308AIRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6308AIRZ, 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 ISL6308AIRZ part is unused and in its original packaging.
Return procedure for ISL6308AIRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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