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Renesas ISL6353IRTZ-T
- Part No.:
- ISL6353IRTZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
ISL6353IRTZ-T.pdf
- Description:
- IC REG CTRLR DDR 1OUT 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,706
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Product details
Overview
ISL6353IRTZ-T from Renesas (formerly Intersil) is a three-phase VR12-compliant PWM buck regulator controller for DDR memory power delivery. It integrates two high-current MOSFET gate drivers, supports DCR/resistor current sensing, delivers 5mV VID voltage steps, and achieves fast transient response via Robust Ripple Regulator™ (R3) technology in DDR3/DDR4 memory subsystems.
For engineers reviewing the ISL6353IRTZ-T datasheet, ISL6353IRTZ-T pinout, ISL6353IRTZ-T application, or ISL6353IRTZ-T equivalent, key selection criteria include VR12 SVID bus compliance, programmable 1-/2-/3-phase operation, differential remote sensing, thermal alert with NTC interface, and R3 modulator's variable-frequency light-load PFM mode.
Technical Context
The ISL6353IRTZ-T implements a master-slave R3 modulator architecture: a master clock circuit generates synchronized phase clocks (120°/180°/0° offset per phase count), while each slave circuit uses synthesized Vcrs ripple voltage-derived from inductor voltage via gm amplifier-to determine PWM on/off timing independent of noise-prone feedback nodes.
It supports full VR12 protocol compliance including serial VID (SVID) communication with CPU, PS0/PS1/PS2 power state control via PSI/VSET pins, adaptive body diode conduction time reduction, and phase-dropping logic that dynamically reconfigures active phases based on load and programmed IMAX thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Standard | VR12 Serial VID (SVID) bus compliant; enables direct CPU-controlled voltage and power-state negotiation |
| Phase Configuration | Programmable 1-, 2-, or 3-phase interleaved operation; supports dynamic phase dropping in PS1/PS2 states |
| Output Voltage Range | 0.25V to 2.155V; 5mV VID step resolution with ±0.5% system accuracy over 0.75–1.50V range |
| Switching Frequency | 200–500kHz adjustable; 300kHz typical with 18kΩ VW-to-COMP resistor |
| Current Sensing | Dual-mode: lossless DCR sensing (with NTC compensation) or precision resistor sensing; supports IMON analog current monitor output |
| Thermal Protection | NTC-based thermal monitoring with VR_HOT# open-drain alert; trip at 0.91V falling, reset at 0.965V rising |
| Operating Temp | -40°C to +85°C ambient; junction rated to +125°C for industrial DDR memory applications |
Pinout & Package
ISL6353IRTZ-T is housed in a Pb-free 40-lead 5mm × 5mm TQFN package with exposed thermal pad (PKG DWG L40.5x5). Pin layout follows standard top-view numbering (1–40 clockwise from top-left corner), with GND connections at pins 26, 31, and bottom pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UG1, UG2 | High-side gate driver outputs | Drive Phase 1/2 upper MOSFET gates; 2A sink/source capability with <30ns deadtime control |
| LG1, LG2 | Low-side gate driver outputs | Drive Phase 1/2 lower MOSFET gates; 4A sink capability ensures robust synchronous rectification |
| ISEN1–ISEN3 | Per-phase current sense inputs | Accept DCR voltage or resistor-based current signals; enable phase-by-phase OCP and current balancing |
| VSEN / RTN | Differential remote voltage sense pair | Compensates for IR drop across PCB traces; maintains tight regulation at DDR memory VDDQ pins |
| SDA / SCLK / ALERT# | SVID bus interface signals | Enable bidirectional communication with CPU for VID updates, status reporting, and thermal alerts |
| VR_ON / PSI / VSET1 / VSET2 | Hardware control inputs | Allow external logic override of power state (PS0/PS1/PS2) and output voltage without SVID bus involvement |
Key Features
| Feature | Design Value |
|---|---|
| Robust Ripple Regulator™ (R3) | Variable-frequency modulation during transients improves response time; natural PFM entry at light load boosts efficiency without external circuitry |
| VR12 SVID Compliance | Full register mapping for VR_READY, VR_HOT#, thermal alert, IMON, and phase-count reporting-enables seamless integration into Intel platform firmware |
| Adaptive Body Diode Conduction Reduction | Minimizes reverse recovery losses in low-side MOSFETs during discontinuous conduction mode, improving efficiency at light loads |
| Differential Remote Sensing | VSEN/RTN pair rejects common-mode noise and compensates for trace resistance, ensuring ±5mV regulation accuracy at point-of-load |
| Programmable Thermal Alert | NTC input with internal 60µA current source enables precise board-level temperature monitoring; VR_HOT# asserts before thermal shutdown |
| Phase Current Balancing | Active per-phase current monitoring and droop compensation ensure ≤20mV imbalance between phases under steady-state and transient conditions |
Applications
| DDR3 Memory Power Delivery | DDR4 Memory Power Delivery |
|---|---|
Use Scenario: Regulating VDDQ supply for dual-channel DDR3 memory modules in server DIMMs and workstation motherboards. IC Role / Device Role / Timing Role: Three-phase VR12 controller coordinating gate drivers, current sensing, and SVID communication with memory controller. Use Value: Achieves <20µs load-step response (26A step) and >93% peak efficiency at 1.5V/40A, meeting JEDEC DDR3 power integrity requirements. |
Use Scenario: Providing tightly regulated VDDQ for DDR4 UDIMM/LRDIMM modules with dynamic voltage scaling and deep power-down states. IC Role / Device Role / Timing Role: Configurable 1-/2-/3-phase controller supporting PS1/PS2 phase-dropping and SVID-driven voltage transitions. Use Value: Enables compliant DDR4 power state transitions (e.g., PS2 → PS0) with <100ms settling time and ±0.5% voltage accuracy across temperature. |
| Industrial Embedded Memory Systems | Network Equipment Memory Regulation |
Use Scenario: Powering DDR3L memory in ruggedized industrial controllers operating from -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-grade VR12 controller with extended temperature rating, thermal alert, and robust noise immunity. Use Value: Maintains stable regulation under EMI-heavy factory environments using differential sensing and R3's low-jitter PWM timing. |
Use Scenario: Delivering clean, efficient VDDQ to DDR4 memory in 10G/25G Ethernet switches and packet processors. IC Role / Device Role / Timing Role: High-efficiency multiphase controller with IMON current monitoring for real-time power budgeting and thermal management. Use Value: Provides analog IMON output (12.45µA/A) for FPGA-based power telemetry and dynamic phase activation based on traffic load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase VR12 controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6353CRTZ-T | Same silicon, 0°C to +70°C ambient rating; lower thermal margin and reduced OCP thresholds in PS1/PS2 modes | Restricted to commercial-temperature computing platforms (e.g., desktop motherboards) | Select only if ambient stays below 70°C and thermal derating is acceptable |
| IR35201MTRPBF | VR12.5/VR13-compliant; adds PMBus support, higher max frequency (1MHz), and enhanced telemetry registers | Required for newer Intel platforms with VR12.5+ specifications and firmware requiring PMBus readback | Choose when upgrading from VR12 to VR12.5/VR13 or needing digital telemetry beyond SVID |
Compared with ISL6353CRTZ-T, the ISL6353IRTZ-T provides guaranteed operation down to -40°C and tighter OCP thresholds across all power states-critical for industrial DDR memory systems. Versus IR35201MTRPBF, it lacks PMBus but offers simpler SVID-only integration and proven compatibility with legacy VR12 BIOS implementations.
Availability
ISL6353IRTZ-T is available at Aetrix Electronics and suitable for DDR3/DDR4 memory power delivery, industrial embedded controllers, and network equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL6353IRTZ-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 acquired Intersil in 2017 and maintains full support for its high-performance analog and power management portfolio, including VR12 controllers.
The ISL6353IRTZ-T belongs to Renesas' VR12 multiphase controller product line, designed specifically for high-efficiency, low-noise DDR memory voltage regulation in servers, workstations, and industrial computing platforms.
FAQ
What is the maximum supported input voltage for the ISL6353IRTZ-T?
The ISL6353IRTZ-T supports an input supply voltage (VIN) up to +25V under recommended operating conditions, with absolute maximum rating of +28V. This allows direct use with standard +12V or +5VDUAL rails common in DDR memory power architectures, while maintaining safe margin against voltage spikes and ripple.
Does the ISL6353IRTZ-T support both DCR and resistor-based current sensing?
Yes, the ISL6353IRTZ-T supports dual current sensing methods: lossless inductor DCR sensing with NTC thermistor compensation for temperature drift correction, and precision shunt resistor sensing. Both methods feed into the same IMON current monitor output and OCP comparators, enabling flexible layout and accuracy trade-offs.
How does the R3 modulator in the ISL6353IRTZ-T improve transient response compared to fixed-frequency PWM?
The R3 modulator in the ISL6353IRTZ-T increases effective switching frequency during load transients by shortening the master clock period when COMP voltage rises-reducing response latency. Unlike fixed-frequency PWM, it avoids output capacitor undersizing risks while maintaining low jitter and 0.5% DC accuracy via integrated error amplifier.
Can the ISL6353IRTZ-T operate in single-phase mode, and how is it configured?
Yes, the ISL6353IRTZ-T can be configured for 1-phase operation by pulling ISEN2 to 5V (disabling Phase 2) and PWM3 to 5V (disabling Phase 3). Alternatively, hardware pins PSI, VSET1, and VSET2 can force PS1 or PS2 states where phase count is reduced automatically based on load and IMAX settings programmed via PROG1/PROG2.
What is the function of the FB2 pin on the ISL6353IRTZ-T?
The FB2 pin on the ISL6353IRTZ-T connects an RC network between VOUT and FB during PS1 and PS2 power states to enhance phase margin and transient performance when phases are dropped. It is internally switched off in PS0 (full-phase) mode. Leaving FB2 unconnected disables this feature without impact on baseline operation.
ISL6353IRTZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 40-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller, DDR, Intel VR12
- Voltage - Input:
- 4.5V ~ 25V
- Number of Outputs:
- 1
- Voltage - Output:
- 0.25V ~ 1.52V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (5x5)
ISL6353IRTZ-T FAQ
1.How can I place an order for ISL6353IRTZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6353IRTZ-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 ISL6353IRTZ-T reliable?
The price and inventory of ISL6353IRTZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6353IRTZ-T is usually 5 days.
3.What payment methods are accepted for ISL6353IRTZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6353IRTZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6353IRTZ-T?
ISL6353IRTZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6353IRTZ-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 ISL6353IRTZ-T?
For technical support, including ISL6353IRTZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6353IRTZ-T requirements.
6.How does Aetrix verify that ISL6353IRTZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6353IRTZ-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 ISL6353IRTZ-T meets industry standards.
7.What is the process for return or replacement of ISL6353IRTZ-T?
All ISL6353IRTZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6353IRTZ-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 ISL6353IRTZ-T part is unused and in its original packaging.
Return procedure for ISL6353IRTZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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