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Renesas ISL6539IAZ-T
- Part No.:
- ISL6539IAZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ISL6539IAZ-T.pdf
- Description:
- IC REG CTRL DDR DRAM 2OUT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,787
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Product details
Overview
ISL6539IAZ-T from Renesas (formerly Intersil) is a wide-input dual PWM controller IC designed for synchronous buck DC/DC conversion in DDR memory and graphics chipset power supplies. It delivers two regulated outputs (0.9V–5.5V), supports DDR-I/DDR2 mode with VTT tracking and VDDQ/2 reference generation, and features voltage feed-forward ramp modulation, current-mode control, and 300kHz synchronized PWM operation.
For engineers reviewing the ISL6539IAZ-T datasheet, ISL6539IAZ-T pinout, ISL6539IAZ-T application, or ISL6539IAZ-T equivalent, this device is critical for high-efficiency, tightly regulated dual-channel power delivery in DDR memory subsystems, GPU core/memory rails, and industrial embedded system regulators where phase-shifted channel control, bidirectional VTT sourcing/sinking, and integrated overvoltage/undervoltage protection are required.
Technical Context
The ISL6539IAZ-T integrates two independent current-mode PWM controllers with input voltage feed-forward, internal error amplifier compensation, and adaptive dead-time control. Its dual-mode architecture switches between independent dual-output regulation (0.9V–5.5V per channel) and DDR-specific operation-where CH2 tracks CH1's VDDQ/2 and sources/sinks current for termination.
Channel synchronization is dynamically configured: 0°, 90°, or 180° phase shift based on VIN voltage and DDR pin state. Overcurrent protection uses lossless rDS(ON) sensing via ISEN pins, with optional external sense resistors for precision; undervoltage lockout (4.0V–4.5V VCC threshold) and overvoltage protection (115% set point) are built-in and latchable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 300 kHz typical; enables fixed-frequency current-mode control with predictable EMI profile and LC filter design. |
| Output Voltage Range | 0.9 V to 5.5 V per channel; supports DDR VDDQ (e.g., 2.5 V), VTT (1.25 V), and general-purpose system rails. |
| VDDQ/2 Reference Accuracy | ±1% at PG2/REF pin; provides buffered, low-impedance 10 mA VDDQ/2 reference required by DDR-I/DDR2 memory interfaces. |
| VTT Current Capability | Sinks and sources up to 10 mA; meets DDR termination load requirements during data bus transitions. |
| Overvoltage Threshold | 115% of set point; holds lower MOSFET on and upper off to clamp output, then auto-resumes after decay. |
| Undervoltage Lockout (VCC) | 4.0 V (falling), 4.45 V (rising); prevents erratic startup or operation outside bias supply specification. |
| Operating Temperature | -40°C to +85°C; qualified for industrial-grade motherboard, server, and graphics card environments. |
Pinout & Package
ISL6539IAZ-T is housed in a 28-lead QSOP (Quad Small Outline Package), Pb-free (RoHS compliant), with 0.65 mm lead pitch and M28.15 package drawing. Thermal resistance θJA = 80°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Independent enable inputs | Control startup sequencing per channel; low = disable, high = active; allows staggered or independent regulation. |
| VSEN1 / VSEN2 | Feedback voltage sense inputs | Connect to resistor dividers setting output voltage; used for PGOOD, OVP, UVP detection and regulation loop. |
| ISEN1 / ISEN2 | Current-sense inputs | Monitor rDS(ON) voltage drop across lower MOSFETs for lossless current sensing and overcurrent protection. |
| UGATE1 / UGATE2 | Upper MOSFET gate drivers | Provide high-current push-pull drive (RUP ≈ 4 Ω, RDN ≈ 2.3 Ω) for N-channel high-side switches. |
| LGATE1 / LGATE2 | Lower MOSFET gate drivers | Drive N-channel low-side switches with fast turn-on/turn-off; optimized for synchronous rectification. |
| PHASE1 / PHASE2 | Switch node connections | Interface to inductor and MOSFET junctions; critical for accurate current sensing and noise-sensitive layout. |
| PG1 / PG2/REF | Power-good / DDR reference output | Open-drain PGOOD1; dual-function PG2/REF = PGOOD2 in dual mode, VDDQ/2 buffer in DDR mode (10 mA sink/source). |
| DDR | Mode selection input | High = DDR mode (VTT tracking, VDDQ/2 ref); low = independent dual-channel regulation with 180° phase shift. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage feed-forward ramp modulation | Compensates for input ripple by scaling PWM ramp with VIN, enabling stable loop response across 3.3V–15V input range. |
| Integrated DDR power solution | Eliminates need for external op-amps or references: VTT tracks VDDQ/2, PG2/REF delivers buffered VDDQ/2, and CH2 sinks/sources bidirectional current. |
| Programmable channel phase shift | 0°, 90°, or 180° inter-channel offset selected via VIN pin voltage in DDR mode-reduces input current ripple and EMI. |
| Lossless rDS(ON) current sensing | Uses MOSFET on-resistance for OCP without sense resistor losses; configurable with external resistor for tighter accuracy. |
| Built-in soft-start with dual timing | SOFT1/SOFT2 pins control independent ramp-up; 5 µA internal current source ensures monotonic startup and avoids inrush overshoot. |
Applications
| DDR Memory Power Supply | Graphics Card GPU Core Rail |
|---|---|
Use Scenario: Powering DDR2 SDRAM modules on desktop/server motherboards requiring precise VDDQ (2.5 V), VTT (1.25 V), and VDDQ/2 reference. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller operating in DDR mode; CH1 regulates VDDQ, CH2 generates and tracks VTT while buffering VDDQ/2 at PG2/REF. Use Value: Eliminates discrete op-amps and references; reduces BOM count by 4+ components and improves tracking accuracy to ±1% over temperature. | Use Scenario: Delivering tightly regulated 1.1 V–1.3 V core voltage to high-performance GPUs with dynamic load transients exceeding 10 A/µs. IC Role / Device Role / Timing Role: Primary PWM controller for GPU core rail; leverages voltage feed-forward and current-mode control for sub-10 µs transient response. Use Value: Maintains ±2% load regulation under 0–5 A step loads; phase-shifted dual channels cut input capacitor RMS current by ~30% vs. single-phase design. |
| Server Board System Regulator | FPGA I/O Bank Supply |
Use Scenario: Generating multiple isolated 1.8 V, 2.5 V, and 3.3 V rails for CPU VRM support circuitry, PCIe switches, and memory controllers in 1U servers. IC Role / Device Role / Timing Role: Dual independent buck controller (DDR = low); each channel programmed for distinct output voltage and soft-start timing. Use Value: Enables independent enable/disable sequencing (EN1/EN2), reducing inrush current during hot-plug events and improving system-level power management. | Use Scenario: Supplying configurable 1.2 V–3.3 V I/O banks on Xilinx/Intel FPGAs where voltage tolerance must stay within ±3% across -40°C to +85°C. IC Role / Device Role / Timing Role: Secondary regulator for FPGA I/O; uses VSEN feedback with Cz compensation for >60° phase margin across full load/temperature range. Use Value: Internal compensation eliminates 3–4 external compensation components per channel; maintains stability with 220 µF–1000 µF ceramic output capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522CRZ | Single-channel, 300 kHz PWM controller with DDR option; lacks second independent channel and VTT sourcing capability. | Only suitable for single-rail DDR applications (e.g., VDDQ only); cannot replace ISL6539IAZ-T in dual-rail or VTT-critical designs. | Select when only one regulated output is needed and VTT tracking is handled externally. |
| TPS51220ARUKR | TI dual-channel DDR controller with integrated MOSFET drivers; supports DDR3/DDR4, higher current capability (up to 25 A/channel), but requires external bootstrap diodes. | Targets newer DDR generations and higher-power GPUs; not pin-compatible and uses different feedback topology (DAC-based reference). | Choose for DDR3/DDR4 systems requiring >10 A per rail and enhanced thermal performance; verify layout compatibility. |
Compared with ISL6539IAZ-T, ISL6522CRZ offers reduced integration for cost-sensitive single-rail use, while TPS51220ARUKR provides higher current scalability and DDR3/4 support at the expense of board redesign and external component additions.
Availability
ISL6539IAZ-T is available at Aetrix Electronics and suitable for DDR memory power systems, graphics card GPU supplies, and industrial motherboard system regulators requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6539IAZ-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 Corporation acquired Intersil in 2017 and continues to support its high-performance analog and power management portfolio. Renesas is a global semiconductor leader focused on embedded solutions for automotive, industrial, and infrastructure markets.
The ISL6539IAZ-T belongs to Renesas' legacy Intersil power management product line, specifically engineered for high-efficiency, multi-rail DC/DC conversion in memory-intensive computing platforms including DDR-I/DDR2-based workstations, servers, and graphics accelerators.
FAQ
What is the primary function of the DDR pin on the ISL6539IAZ-T?
The DDR pin configures the ISL6539IAZ-T's operational mode: when pulled high, it activates DDR-specific functionality-CH2 tracks VDDQ/2, PG2/REF outputs the buffered VDDQ/2 reference, and CH2 sources/sinks current for termination. When low, the device operates as two independent PWM controllers with 180° phase shift. This pin directly determines whether ISL6539IAZ-T functions as a complete DDR power solution or a generic dual-channel regulator.
Does the ISL6539IAZ-T support both DDR-I and DDR2 memory standards?
Yes, the ISL6539IAZ-T explicitly supports both DDR-I and DDR2 memory standards. Its DDR mode provides VDDQ regulation (typically 2.5 V for DDR-I, 1.8 V for DDR2), precise VTT tracking at VDDQ/2, and a buffered VDDQ/2 reference output-all meeting JEDEC specifications for both generations. The datasheet confirms compatibility in Applications and Functional Description sections, and the VDDQ/2 accuracy (±1%) and VTT sourcing/sinking capability meet DDR-I/DDR2 timing and termination requirements.
How does the ISL6539IAZ-T achieve fast transient response in high-performance applications?
The ISL6539IAZ-T achieves fast transient response through voltage feed-forward ramp modulation-where the PWM comparator ramp amplitude scales with VIN-and current-mode control with internal compensation. This combination rejects input voltage variation and provides inherent loop stability across wide LC filter selections. Measured load regulation is ±2.0% under 0–5 A steps, and the integrated 300 kHz oscillator ensures predictable switching behavior essential for GPU and FPGA core rails.
Can the ISL6539IAZ-T operate from a 3.3 V input supply?
Yes, the ISL6539IAZ-T supports dual input configurations: it can operate directly from an unregulated 5.0 V to 15.0 V DC source, or from a regulated 3.3 V or 5.0 V system rail. In both cases, the internal bias is derived from the VCC pin (5.0 V ±5%), which must be supplied externally. The VIN pin serves as feed-forward input and phase-shift control in DDR mode-not as the main power source-so 3.3 V system rail operation is fully supported when VCC is properly biased.
What protection features are integrated into the ISL6539IAZ-T?
The ISL6539IAZ-T integrates overvoltage protection (115% set point), undervoltage protection (75% set point, latching), adjustable overcurrent protection (via OCSET pins), and VCC undervoltage lockout (4.0 V–4.45 V). Each channel has independent PGOOD monitoring, and fault conditions trigger automatic shutdown with auto-recovery (OVP) or latched disable (UVP). These protections apply to both channels in dual mode and to CH1 only in DDR mode, ensuring robust operation in mission-critical memory and graphics power systems.
ISL6539IAZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Controller, DDR DRAM, SDRAM
- Voltage - Input:
- 3.3V ~ 18V
- Number of Outputs:
- 2
- Voltage - Output:
- 0.9V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP/QSOP
ISL6539IAZ-T FAQ
1.How can I place an order for ISL6539IAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6539IAZ-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 ISL6539IAZ-T reliable?
The price and inventory of ISL6539IAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6539IAZ-T is usually 5 days.
3.What payment methods are accepted for ISL6539IAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6539IAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6539IAZ-T?
ISL6539IAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6539IAZ-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 ISL6539IAZ-T?
For technical support, including ISL6539IAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6539IAZ-T requirements.
6.How does Aetrix verify that ISL6539IAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6539IAZ-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 ISL6539IAZ-T meets industry standards.
7.What is the process for return or replacement of ISL6539IAZ-T?
All ISL6539IAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6539IAZ-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 ISL6539IAZ-T part is unused and in its original packaging.
Return procedure for ISL6539IAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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