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Renesas ISL6308CRZ
- Part No.:
- ISL6308CRZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6308CRZ.pdf
- Description:
- IC REG CTRLR DDR 1OUT 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,594
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Product details
Overview
ISL6308CRZ from Renesas (formerly Intersil) is a three-phase buck PWM controller IC 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 reference settings, features dual DCR/rDS(ON) current sensing, and operates across 0°C to +70°C ambient temperature.
For engineers reviewing the ISL6308CRZ datasheet, ISL6308CRZ pinout, ISL6308CRZ application, or ISL6308CRZ equivalent, key selection considerations include its 40-lead 6×6 QFN package, programmable 0.6–1.5V DAC reference, 225–275 kHz oscillator frequency, integrated droop control, and multi-tiered overvoltage/overcurrent protection architecture.
Technical Context
The ISL6308CRZ implements interleaved three-phase PWM control using a shared sawtooth oscillator and phase-shifted termination signals-PWM2 lags PWM1 by one-third cycle, PWM3 lags PWM2 by one-third cycle. Its error amplifier features 96 dB DC gain and 20 MHz gain-bandwidth product, enabling stable Type II/III compensation for fast transient response in DDR and FPGA core supplies.
Current sensing combines lossless rDS(ON) sampling on ISEN1–ISEN3 for per-channel balance and continuous DCR-based sensing via ISUM/IREF/ICOMP for load-line droop and overcurrent protection. The controller uses adaptive non-overlap timing (10 ns typical) and gate drive resistances of 0.85–3.0 Ω to prevent shoot-through in high-frequency synchronous buck stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 225–275 kHz - sets base switching frequency; determines ripple amplitude, inductor size, and input/output capacitor requirements |
| System Accuracy | ±0.5% over temperature (at 1.2V/1.5V DAC setting) - ensures tight output regulation for sensitive digital loads like DDR memory |
| Gate Drive Voltage Range | 5V to 12V on PVCC pins - enables optimization of MOSFET switching speed and conduction loss trade-offs |
| OCSET Trip Current | 100 µA ±7% - defines overcurrent threshold via external resistor; enables precise, scalable current limiting |
| Droop Enable | Pin-controlled (DROOP tied to ICOMP) - implements load-line voltage positioning for improved transient response without external circuitry |
| Remote Sensing | Differential VSEN/RGND inputs with 20 MHz bandwidth - compensates for PCB IR drop to maintain regulation accuracy at load point |
| Thermal Shutdown | 160°C setpoint with 100°C recovery hysteresis - protects against sustained overload or poor heatsinking in compact power modules |
Pinout & Package
ISL6308CRZ 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 validated per Intersil FN9208 Rev 4.00.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (6) | Bias supply input | +5V ±5% supply for internal logic and error amplifier; requires local 1.0 µF ceramic decoupling |
| PVCC1/2/3 (33,24,18) | Channel gate drive supplies | Independent 5–12V supplies per phase; tying PVCC2 or PVCC3 to GND disables corresponding phase |
| UGATE1/2/3 (31,27,20) | Upper MOSFET gate drivers | High-side gate outputs with adaptive non-overlap; max 66% duty cycle per channel |
| LGATE1/2/3 (34,23,17) | Lower MOSFET gate drivers | Synchronous rectifier drivers; no external series resistors permitted to preserve shoot-through protection |
| ISEN1/2/3 (32,25,19) | rDS(ON) current sense inputs | Sample lower FET conduction current for per-channel balancing; resistor-connected to PHASE node |
| ISUM/IREF/ICOMP (15,16,13) | DCR current sense interface | Summing node (ISUM), reference sum (IREF), and droop amplifier output (ICOMP) for load-line and OCP |
| REF0/REF1 (40,39) | DAC reference select | 2-bit TTL inputs selecting 0.6V/0.9V/1.2V/1.5V internal DAC reference; internally pulled high |
| ENLL (37) | Enable threshold input | 0.63 V typical enable threshold with 61 mV hysteresis; disables all PWM and gate drive when low |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3-phase PWM + drivers | Eliminates need for 3 discrete driver ICs; reduces BOM count, layout area, and propagation delay mismatch |
| Dual current sensing (DCR + rDS(ON)) | Enables simultaneous accurate overcurrent protection (DCR) and per-phase current balancing (rDS(ON)) without added components |
| Differential remote voltage sensing | Compensates for up to 100 mV ground potential difference between IC and load; maintains ±0.5% regulation accuracy at point-of-load |
| Programmable droop (load line) | Configurable via DROOP pin tie-off; provides automatic output voltage scaling under load to improve transient response in CPU/FPGA supplies |
| Multi-tier overvoltage protection | Clamps output via lower FET turn-on *and* asserts open-drain OVP signal to trigger external crowbar - dual-layer safety for critical loads |
Applications
| High Current DDR Core Regulator | Low-Voltage FPGA Power Supply |
|---|---|
Use Scenario: Regulating 1.2V/30A core voltage for DDR4 memory subsystems in servers and networking equipment. IC Role / Device Role / Timing Role: Three-phase buck controller managing interleaved switching, real-time current balancing, and load-line droop to meet JEDEC DDR4 VRM spec. Use Value: Achieves <1% output deviation during 20A/µs load transients and reduces output capacitance by 40% vs. single-phase design. | Use Scenario: Delivering 0.85V/45A to high-end FPGA fabric in industrial PLCs and test equipment. IC Role / Device Role / Timing Role: Precision voltage regulator with differential remote sensing and dynamic reference offset to compensate for board-level IR drop. Use Value: Maintains ±5 mV regulation at FPGA VCCINT pins despite 80 mΩ PCB trace resistance between VRM and load. |
| Chipset Voltage Regulator | ASIC Point-of-Load Converter |
Use Scenario: Generating 1.05V/25A for x86 chipset I/O and memory controller in embedded computing platforms. IC Role / Device Role / Timing Role: Multi-phase controller implementing digital soft-start, pre-biased startup, and PGOOD sequencing for system power management. Use Value: Enables reliable cold-boot into pre-charged rail and meets Intel VR12.5 chipset power-up timing requirements. | Use Scenario: Providing 1.8V/20A to ASIC SoC in telecom baseband units with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: High-efficiency buck controller using 12V PVCC bias to optimize gate drive strength and minimize switching losses. Use Value: Reduces MOSFET conduction loss by 35% vs. 5V gate drive while maintaining <10 ns non-overlap timing for robust shoot-through immunity. |
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 |
|---|---|---|---|
| ISL6308A | Direct Renesas-recommended replacement; improved thermal shutdown hysteresis and tighter DAC accuracy (±0.3% at 1.2V) | Identical pinout and feature set; supports same 0°C to +70°C range but with enhanced reliability for new designs | Select ISL6308A for new designs requiring extended lifecycle support and tighter output tolerance. |
| IR35201 | Three-phase controller with digital PMBus interface, 300–1000 kHz programmable frequency, and integrated telemetry | Requires firmware configuration and external EEPROM; suited for systems needing remote monitoring and dynamic VID adjustment | Choose IR35201 when digital control, telemetry, or dynamic voltage scaling are required - not a drop-in analog replacement. |
Compared with ISL6308CRZ, ISL6308A offers higher accuracy and updated thermal protection without layout changes, while IR35201 adds digital configurability at the cost of analog simplicity and component count - making ISL6308A the preferred upgrade path for legacy-compatible designs.
Availability
ISL6308CRZ is available at Aetrix Electronics and suitable for high-current DDR core regulators, FPGA power supplies, and chipset voltage regulation requiring stable component supply and long-term industrial availability.
Supply support for ISL6308CRZ 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 support for legacy Intersil power management ICs including the ISL6308 family.
The ISL6308 product line was engineered specifically for high-efficiency, multi-phase DC/DC conversion in space-constrained digital systems - targeting DDR memory, CPU chipset, and FPGA/ASIC core voltage regulation with analog precision and integrated driver capability.
FAQ
What is the operating temperature range for the ISL6308CRZ?
The ISL6308CRZ is rated for an ambient operating temperature range of 0°C to +70°C, as specified in the Intersil FN9208 Rev 4.00 datasheet ordering table. This commercial-grade rating applies specifically to the CRZ suffix variant and is distinct from the industrial-grade ISL6308IRZ (-40°C to +85°C). Thermal shutdown activates at 160°C junction temperature, with recovery at 100°C.
Does the ISL6308CRZ support single-phase operation?
Yes, the ISL6308CRZ supports 1-, 2-, or 3-phase operation via hardware configuration. Tying both 3PH (Pin 1) and 2PH (Pin 2) to GND configures single-phase mode. Alternatively, grounding only PVCC2 and PVCC3 achieves the same result. The controller automatically detects active phases and adjusts PWM timing accordingly - no firmware or register programming is required.
How is output voltage programmed on the ISL6308CRZ?
Output voltage on the ISL6308CRZ is programmed using either the internal 4-level DAC (0.6V, 0.9V, 1.2V, or 1.5V) selected by REF0/REF1 logic inputs, or an external reference applied directly to the REF pin (0.6V–1.75V range). The DAC output connects to REF via a 1kΩ–5kΩ resistor. An optional OFST pin allows ±50 µA offset current generation to fine-tune regulation point.
What protection features does the ISL6308CRZ provide?
The ISL6308CRZ integrates multi-tiered protection: overvoltage protection (OVP) clamps output via lower FET turn-on and asserts an open-drain OVP signal; overcurrent protection (OCP) triggers at 100 µA on OCSET pin; undervoltage lockout (UVLO) monitors VSEN; open-sense-line detection trips if VDIFF exceeds threshold; and thermal shutdown activates at 160°C. All protections are fully analog and require no configuration.
Is the ISL6308CRZ pin-compatible with the ISL6308A?
Yes, the ISL6308CRZ is pin-compatible and functionally compatible with the ISL6308A. Renesas explicitly lists ISL6308A as the recommended replacement for ISL6308 in the FN9208 datasheet. Both share identical 40-lead QFN packaging, pin assignments, electrical interfaces, and feature set - with ISL6308A offering enhanced specifications including tighter DAC accuracy and improved thermal hysteresis.
ISL6308CRZ 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-QFN (6x6)
ISL6308CRZ FAQ
1.How can I place an order for ISL6308CRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6308CRZ 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 ISL6308CRZ reliable?
The price and inventory of ISL6308CRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6308CRZ is usually 5 days.
3.What payment methods are accepted for ISL6308CRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6308CRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6308CRZ?
ISL6308CRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6308CRZ 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 ISL6308CRZ?
For technical support, including ISL6308CRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6308CRZ requirements.
6.How does Aetrix verify that ISL6308CRZ is sourced from the original manufacturer or authorized distributors?
All ISL6308CRZ 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 ISL6308CRZ meets industry standards.
7.What is the process for return or replacement of ISL6308CRZ?
All ISL6308CRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6308CRZ, 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 ISL6308CRZ part is unused and in its original packaging.
Return procedure for ISL6308CRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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