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Renesas ISL6537ACR
- Part No.:
- ISL6537ACR
- Manufacturer:
- Renesas
- Category:
- Power Management - Specialized
- Package:
- 28-VQFN Exposed Pad
- Datasheet:
-
ISL6537ACR.pdf
- Description:
- IC REG/CTRLR ACPI DUAL DDR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,347
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Product details
Overview
ISL6537ACR from Intersil is a dual-channel DDR/DDR2 memory power controller IC providing five regulated voltages: synchronous buck PWM for VDDQ (0.8V–1.8V), integrated 3A sink-source linear regulator for VTT (VDDQ/2), PWM for GMCH core, LDO for CPU/GMCH VTT termination, and LDO for DAC. It supports ACPI S0/S1/S3 states with glitch-free transitions and operates in 28-lead 6×6 QFN at 0°C to +70°C.
For engineers reviewing the ISL6537ACR datasheet, ISL6537ACR pinout, ISL6537ACR application, or ISL6537ACR equivalent, key selection considerations include its 250kHz phase-shifted dual-PWM architecture, ±2% output regulation over temperature, integrated adaptive shoot-through protection, VDDQ overcurrent hiccup mode, and VIDPGD status signaling for GMCH/CPU VTT compliance in desktop and graphics memory systems.
Technical Context
The ISL6537ACR implements two independent 250kHz voltage-mode PWM controllers - one fully integrated (VDDQ) driving N-MOSFETs directly, the other (GMCH core) requiring external drivers - with 180° phase shift to reduce input ripple. Its VTT regulator uses an internal precision 0.8V reference and buffered VREF_OUT to deliver accurate VDDQ/2 termination without negative supply.
All five outputs feature undervoltage monitoring; VDDQ adds overvoltage and overcurrent protection via OCSET pin and rDS(ON)-based sensing; thermal shutdown activates at 140°C. Soft-start sequencing follows strict ACPI state transitions (S5→S0, S3→S0), with digital ramp control per rail and internal fault counter limiting repeated failures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PWM Frequency | 250 kHz ±12% - enables compact magnetics and predictable EMI filtering for DDR memory supplies. |
| VDDQ Output Range | Adjustable down to 0.8V via external resistor divider - supports DDR (2.5V) and DDR2 (1.8V) VDDQ specifications. |
| VTT Current Capability | ±3 A continuous - meets JEDEC DDR/DDR2 termination current requirements with sink/source capability. |
| Output Regulation Accuracy | ±2% over line, load, and temperature - ensures stable memory interface timing margins across operating conditions. |
| Reference Voltage | 0.800 V ±2% - serves as precision基准 for all error amplifiers and VREF_OUT buffer (VDDQ/2 tracking). |
| Operating Temperature | 0°C to +70°C ambient - validated for commercial desktop, graphics card, and embedded processor memory subsystems. |
| Package | 28-lead 6×6 mm QFN with exposed thermal pad - provides low-θJA (32°C/W) for high-current regulator thermal management. |
Pinout & Package
ISL6537ACR is housed in a 28-lead, 6 mm × 6 mm QFN package (PKG DWG # L28.6x6) with exposed thermal pad connected to GND for enhanced heat dissipation. Pin functions are validated per FN9143 Rev 5.00 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UGATE (26), LGATE (28) | VDDQ gate drivers | Direct-drive N-MOSFET gates with adaptive shoot-through protection; must connect directly-no series components allowed. |
| FB (15), COMP (16) | VDDQ feedback & compensation | Single-loop voltage-mode control; FB sets output via resistor divider; COMP accepts RC network for stability. |
| DDR_VTT (5,6), DDR_VTTSNS (9) | VTT output & sense | Delivers ±3A VDDQ/2 termination; VTTSNS connects to physical VTT point for accurate closed-loop regulation. |
| VREF_OUT (13), VREF_IN (14) | VTT reference buffer & startup ramp | VREF_OUT is buffered VDDQ/2; VREF_IN capacitor sets controlled VTT soft-start rise time during S3→S0 transition. |
| PWM4 (19), FB4 (18), COMP4 (17) | GMCH core PWM interface | Drives external MOSFET driver; FB4 sets GMCH voltage; phase-shifted 180° from VDDQ PWM to reduce input ripple. |
| VIDPGD (12) | VTT_GMCH/CPU status flag | Open-drain output pulled low if GMCH/CPU VTT is out-of-regulation in S0/S1/S2 - used for system-level fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| ACPI-compliant multi-state control | Hardware-managed S0/S1/S3 transitions with sequenced soft-start, no firmware required - reduces BIOS complexity. |
| Dual 250kHz phase-shifted PWM | Reduces input capacitor RMS current by ~30% vs. in-phase operation - lowers bulk capacitance and board area. |
| VDDQ overcurrent hiccup mode | OCSET pin programs trip threshold using MOSFET rDS(ON) - eliminates sense resistor, improves efficiency, enables fast fault recovery. |
| VTT sink-source linear regulator | Eliminates need for negative supply while delivering ±3A - simplifies PCB layout and reduces BOM count for DDR termination. |
| Integrated VREF buffer (VREF_OUT) | Provides low-impedance, noise-immune VDDQ/2 reference for VTT regulation and system-level VREF distribution. |
Applications
| Desktop Memory Power | Graphics Card Memory Supply |
|---|---|
Use Scenario: Dual-channel DDR2 memory subsystem in ATX-based desktop PCs requiring ACPI S3 sleep state support and stable VDDQ/VTT rails. IC Role / Device Role / Timing Role: Primary power controller managing VDDQ, VTT_DDR, GMCH core, CPU VTT, and DAC rails with synchronized soft-start and fault isolation. Use Value: Eliminates discrete regulators and sequencing ICs - reduces component count by ≥5 devices while ensuring JEDEC-compliant DDR2 termination accuracy (±2%). | Use Scenario: High-bandwidth GDDR3/GDDR5 memory on discrete GPU cards needing low-noise, tightly regulated VDDQ and VTT with rapid wake-from-sleep response. IC Role / Device Role / Timing Role: Centralized memory power manager delivering phase-shifted 250kHz PWM for VDDQ and GMCH, plus buffered VREF_OUT for system-wide reference integrity. Use Value: 180° phase shift cuts input ripple by 50%, enabling smaller bulk capacitors; VTT sink-source capability avoids external op-amps for bidirectional termination current. |
| ASIC Memory Interface Supply | Embedded Processor DDR Power |
Use Scenario: ASIC-based storage or networking platforms with DDR2 memory interfaces requiring robust power sequencing and fault logging across thermal and voltage extremes. IC Role / Device Role / Timing Role: Regulator/controller providing five independent, monitored rails with VIDPGD status flag and internal fault counter for diagnostics. Use Value: Integrated UV/OV/OC/thermal protection enables autonomous fault handling - reduces host processor intervention and improves system uptime. | Use Scenario: Industrial embedded systems using DDR memory where long-term supply continuity and RoHS compliance are mandatory. IC Role / Device Role / Timing Role: Pb-free QFN-packaged power solution supporting 0°C to +70°C operation with full ACPI state management and traceable sourcing. Use Value: RoHS-compliant "Pb-Free Plus Anneal" construction ensures compatibility with SnPb and lead-free reflow - simplifies manufacturing transition and lifecycle management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DDR memory power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6537CR | Same functionality but rated for -40°C to +85°C industrial temp range; identical pinout and electrical specs except extended thermal limits. | Suitable for extended-temperature embedded or industrial DDR systems where ambient exceeds +70°C. | Select ISL6537CR when operating ambient exceeds +70°C; otherwise ISL6537ACR offers cost-optimized commercial-grade performance. |
| RT8105DGQW | Single-channel DDR3 VDDQ+VTT controller with integrated MOSFET drivers; lacks GMCH core PWM, CPU VTT LDO, and DAC regulator - only 3 regulated outputs. | Applicable only to single-channel DDR3 designs without GMCH or CPU termination requirements. | Choose RT8105DGQW for simplified DDR3 memory power with lower channel count; ISL6537ACR remains required for dual-channel DDR2 with full ACPI-compliant multi-rail control. |
Compared with ISL6537CR, the ISL6537ACR trades extended temperature range for lower cost and optimized commercial use; versus RT8105DGQW, it delivers full dual-channel DDR2 functionality with GMCH core regulation and CPU VTT support - making it irreplaceable in legacy desktop and graphics memory platforms requiring five-rail coordination.
Availability
ISL6537ACR is available at Aetrix Electronics and suitable for desktop motherboards, graphics cards, ASIC memory interfaces, and embedded processor DDR systems requiring stable component supply, RoHS compliance, and long-term lifecycle support.
Supply support for ISL6537ACR 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
Intersil (now part of Renesas Electronics) is a U.S.-based analog and power management IC designer known for high-performance DC-DC controllers and precision voltage references.
The ISL6537ACR belongs to Intersil's ACPI-compliant memory power controller product line, engineered specifically for dual-channel DDR/DDR2 memory subsystems in desktop PCs and graphics cards - emphasizing seamless sleep-state transitions, tight regulation, and integrated fault protection.
FAQ
What is the primary function of the ISL6537ACR in a DDR memory system?
The ISL6537ACR serves as a complete ACPI-compliant power controller for dual-channel DDR/DDR2 memory systems. It generates five regulated voltages: VDDQ (via synchronous buck PWM), VTT_DDR (via integrated ±3A sink-source linear regulator), GMCH core (via second PWM), CPU/GMCH VTT (via LDO), and DAC supply (via LDO). The ISL6537ACR manages state transitions (S0/S1/S3), provides fault protection, and delivers buffered VREF_OUT for system-level reference integrity - all within a single 28-pin QFN package.
Does the ISL6537ACR support DDR2 memory voltage requirements?
Yes, the ISL6537ACR fully supports DDR2 memory specifications. Its VDDQ output is adjustable down to 0.8V using external resistors, covering the DDR2 standard range of 1.8V ±0.1V. The integrated VTT regulator delivers precise VDDQ/2 (e.g., 0.9V for 1.8V VDDQ) with ±2% accuracy and ±3A sink/source capability - meeting JEDEC DDR2 termination requirements. The 250kHz switching frequency and phase-shifted dual-PWM architecture further optimize efficiency and noise for DDR2 timing margins.
How does the ISL6537ACR implement overcurrent protection on the VDDQ rail?
The ISL6537ACR implements VDDQ overcurrent protection using an rDS(ON)-based sensing method via the OCSET pin. An internal 20µA current source flows through an external ROCSET resistor, generating a reference voltage. When the voltage drop across the upper MOSFET (proportional to peak inductor current) exceeds this reference, the controller initiates hiccup-mode soft-start recovery. This eliminates the need for a lossy current-sense resistor, preserving efficiency. The trip threshold is programmable and temperature-compensated, and the ISL6537ACR disables only the VDDQ regulator during fault - isolating impact on other rails.
What is the role of the VIDPGD pin on the ISL6537ACR?
The VIDPGD pin on the ISL6537ACR is an open-drain logic output that signals the operational status of the GMCH/CPU VTT regulator. It pulls low whenever the VTT_GMCH/CPU rail is out of regulation in S0/S1/S2 states - indicating a fault condition such as undervoltage or overload. In all other states (S3/S4/S5), VIDPGD remains low by default. This pin enables motherboard-level fault detection and system-level power-good sequencing without requiring additional monitoring circuitry, and is a key interface for BIOS or EC validation of memory termination health in the ISL6537ACR design.
Can the ISL6537ACR be used in RoHS-compliant manufacturing processes?
Yes, the ISL6537ACR is RoHS compliant and qualified for lead-free manufacturing. It uses Intersil's "Pb-Free Plus Anneal" construction: 100% matte tin-plated terminations, Pb-free molding compound, and die attach materials compatible with both SnPb and Pb-free reflow profiles (per IPC/JEDEC J-STD-020). The ISL6537ACRZ and ISL6537ACRZA variants explicitly denote Pb-free packaging, and the ISL6537ACR itself shares the same material set and MSL rating - ensuring reliable assembly in modern RoHS-compliant production lines without solderability or reliability concerns.
ISL6537ACR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-VQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Memory, DDR/DDR2 Regulator
- Current - Supply:
- 7mA
- Voltage - Supply:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (6x6)
ISL6537ACR FAQ
1.How can I place an order for ISL6537ACR through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6537ACR 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 ISL6537ACR reliable?
The price and inventory of ISL6537ACR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6537ACR is usually 5 days.
3.What payment methods are accepted for ISL6537ACR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6537ACR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6537ACR?
ISL6537ACR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6537ACR 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 ISL6537ACR?
For technical support, including ISL6537ACR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6537ACR requirements.
6.How does Aetrix verify that ISL6537ACR is sourced from the original manufacturer or authorized distributors?
All ISL6537ACR 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 ISL6537ACR meets industry standards.
7.What is the process for return or replacement of ISL6537ACR?
All ISL6537ACR units undergo pre-shipment inspection (PSI). If there is an issue with ISL6537ACR, 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 ISL6537ACR part is unused and in its original packaging.
Return procedure for ISL6537ACR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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