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Renesas ISL6537CRZR5160
- Part No.:
- ISL6537CRZR5160
- Manufacturer:
- Renesas
- Category:
- Power Management - Specialized
- Package:
- 28-VQFN Exposed Pad
- Datasheet:
-
ISL6537CRZR5160.pdf
- Description:
- IC REG/CTRLR ACPI DUAL DDR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,283
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Product details
Overview
ISL6537CRZR5160 from Renesas (formerly Intersil) is an ACPI-compliant dual-channel DDR memory power controller integrating a 250kHz synchronous buck PWM controller for VDDQ, a ±3A sink-source VTT regulator referenced to VDDQ/2, two LDO controllers for GMCH core and CPU/GMCH VTT, and integrated VREF buffer - designed for ATX-powered desktop and graphics card memory subsystems.
For engineers reviewing the ISL6537CRZR5160 datasheet, ISL6537CRZR5160 pinout, ISL6537CRZR5160 application, or ISL6537CRZR5160 equivalent, key selection considerations include its 0.8V precision reference, ±2% output regulation over temperature, S3/S5 sleep-state control logic, adaptive shoot-through protection, and 28-pin 6×6 QFN package with exposed thermal pad.
Technical Context
The ISL6537CRZR5160 implements voltage-mode PWM control with 250kHz fixed-frequency operation, 8.2ms typical soft-start interval, and fast transient response enabled by 15MHz gain-bandwidth error amplifiers. Its VDDQ regulation uses external resistor feedback (FB pin) referenced to a stable 0.800V internal reference.
It integrates four independent regulation paths: a synchronous buck converter driving N-MOSFETs via UGATE/LGATE; a fully integrated VTT linear regulator with DDR_VTTSNS feedback and ±3A load capability; and two LDO controllers (DRIVE2/FB2 and DRIVE3/FB3/DRIVE4/FB4/REFADJ4) managing GMCH core and CPU/GMCH termination rails under ACPI state transitions (S0–S5).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PWM Frequency | 250 kHz ±12% - enables compact magnetics and predictable EMI profile in DDR memory power stages. |
| VDDQ Reference Voltage | 0.800 V ±2% - sets base accuracy for all regulated outputs including VTT = VDDQ/2. |
| VTT Load Current | ±3 A - supports high-current DDR/DDR2 termination without external current boost. |
| Output Regulation Tolerance | ±2% over line/load/temperature - ensures compliance with DDR2 VDDQ (1.8V ±2%) and VTT (0.9V ±2%) specs. |
| Soft-Start Interval | 8.2 ms typical - prevents inrush current during S3→S0 wake-up and cold start sequences. |
| Thermal Shutdown Threshold | 140°C nominal - disables all regulators to protect IC and system during sustained overload or poor heatsinking. |
| ACPI Sleep Control Inputs | S3# and S5# logic inputs - enable glitch-free state transitions between S0, S3, and S5 with automatic sequencing and VIDPGD status reporting. |
Pinout & Package
ISL6537CRZR5160 is housed in a thermally enhanced 28-lead 6×6 mm QFN package (L28.6x6) with exposed ground paddle. The package supports Pb-free reflow per IPC/JEDEC J-STD-020 and requires low-inductance grounding of the paddle to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UGATE (26) | Upper MOSFET gate driver output | Drives N-channel high-side switch; monitored for adaptive shoot-through protection - no external components allowed. |
| LGATE (28) | Lower MOSFET gate driver output | Drives N-channel low-side switch; monitored for adaptive shoot-through protection - no external components allowed. |
| FB (15) | VDDQ feedback input | Connects to resistor divider from VDDQ output; sets output voltage down to 0.8V with ±2% accuracy. |
| DDR_VTT (5,6) | VTT linear regulator output | Delivers ±3A VTT rail at VDDQ/2; disabled in S3 state to allow rail floating per DDR specification. |
| VREF_OUT (13) | Buffered VDDQ/2 reference output | Provides low-impedance 0.8V reference for external circuits; requires ≥0.1µF bypass to VDDQ and GND. |
| VIDPGD (12) | Open-drain VTT_GMCH/CPU status flag | Asserts low when GMCH/CPU VTT is out-of-regulation in S0/S1 - used for system-level fault monitoring. |
| S3# (2), S5# (23) | ACPI sleep state inputs | Accept ATX SLP_S3# and SLP_S5# signals to coordinate regulator enable/disable sequencing across power states. |
| OCSET (22) | Overcurrent threshold programming | Connects to ROCSET resistor; sets VDDQ peak current limit using upper MOSFET rDS(ON) sensing (no sense resistor needed). |
Key Features
| Feature | Design Value |
|---|---|
| Four integrated regulators | Simultaneous VDDQ (buck), DDR VTT (±3A sink/source), GMCH core (dual LDO), and CPU/GMCH VTT (LDO) - eliminates need for discrete controllers in dual-channel DDR systems. |
| ACPI-compliant state management | Hardware-controlled S0/S3/S5 sequencing with automatic soft-start reset, VIDPGD reporting, and rail floating during S3 - meets Intel ATX and DDR2 platform requirements. |
| VDDQ/2 tracking reference | VREF_OUT provides buffered, low-noise VDDQ/2 signal for VTT regulation and system-level termination reference - eliminates external divider and op-amp. |
| Ripple-free shoot-through protection | Adaptive gate monitoring on UGATE/LGATE detects MOSFET turn-off before enabling complementary switch - prevents cross-conduction without timing delays or external circuitry. |
| No external current-sense resistor | OCSET pin uses internal 20µA current source + ROCSET + MOSFET rDS(ON) to set overcurrent trip - reduces BOM count and improves efficiency vs. shunt-based sensing. |
Applications
| Desktop Memory Power | Graphics Card Memory Supply |
|---|---|
Use Scenario: Dual-channel DDR2 memory subsystem in ATX desktop motherboard with ACPI S3/S4/S5 support. IC Role / Device Role / Timing Role: Primary power controller managing VDDQ, VTT_DDR, VGMCH, and VTT_GMCH/CPU rails with synchronized state transitions. Use Value: Eliminates four discrete regulators and associated sequencing logic; achieves ±2% VDDQ/VTT regulation required by DDR2 JEDEC spec. | Use Scenario: GPU memory interface on discrete graphics card requiring fast wake-from-sleep and tight termination voltage control. IC Role / Device Role / Timing Role: Regulator for GDDR3/GDDR5 memory VDDQ and VTT rails, interfacing with GPU's VREF and termination logic. Use Value: Delivers 250kHz switching with fast transient response to handle GPU memory burst loads; VREF_OUT ensures accurate VTT tracking during dynamic refresh cycles. |
| ASIC Memory Interface Power | Embedded Processor DDR Subsystem |
Use Scenario: High-performance ASIC with integrated DDR2 controller requiring compliant memory termination and low-noise supply. IC Role / Device Role / Timing Role: Dedicated DDR power manager providing isolated VDDQ and VTT rails with independent fault monitoring per rail. Use Value: Integrated VTT sink/source capability handles bidirectional data bus currents up to ±3A without external op-amps or discrete transistors. | Use Scenario: Industrial embedded system using DDR2 SODIMM with extended temperature operation and ACPI-like power state control. IC Role / Device Role / Timing Role: Centralized memory power controller supporting cold start, S3 resume, and thermal shutdown coordination across multiple voltage domains. Use Value: 0°C to +70°C operating range and 140°C thermal shutdown ensure reliability in fanless enclosures; VIDPGD enables firmware-level VTT health verification. |
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 |
|---|---|---|---|
| ISL6522CRZ | Single-channel DDR2 controller; lacks GMCH core LDO and second VTT LDO; 20-pin QFN. | Supports only one DDR channel; no CPU/GMCH VTT regulation; unsuitable for dual-channel or chipset-core power. | Select ISL6522CRZ only for cost-sensitive single-DIMM designs where GMCH core and CPU VTT are handled externally. |
| RT8120AGQW | Single-output VDDQ controller with external VTT generation; no integrated VTT sink/source or VREF buffer; 24-pin QFN. | Requires external op-amp and MOSFETs for VTT; no ACPI state logic or VIDPGD; limited to basic DDR2 VDDQ regulation. | Choose RT8120AGQW when only VDDQ regulation is needed and system-level VTT control is implemented separately. |
Compared with ISL6537CRZR5160, ISL6522CRZ reduces integration for single-channel use but omits critical dual-rail functions, while RT8120AGQW shifts VTT complexity to external components - making ISL6537CRZR5160 the only option delivering full ACPI-compliant dual-channel DDR2 power management in one package.
Availability
ISL6537CRZR5160 is available at Aetrix Electronics and suitable for desktop motherboards, graphics cards, ASIC memory interfaces, and embedded DDR2 systems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6537CRZR5160 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 is a global semiconductor leader formed from the merger of Renesas Technology and NEC Electronics, specializing in microcontrollers, analog, and power management ICs for industrial, automotive, and computing markets.
The ISL6537CRZR5160 belongs to Renesas' legacy Intersil DDR memory power controller product line, engineered specifically to meet Intel AC'97/ACPI and JEDEC DDR2 platform power architecture requirements with integrated multi-rail regulation and state-aware sequencing.
FAQ
What is the primary function of the ISL6537CRZR5160 in a DDR2 memory system?
The ISL6537CRZR5160 serves as a complete ACPI-compliant power controller for dual-channel DDR2 memory systems. It generates and regulates four critical voltages: VDDQ via synchronous buck PWM, DDR VTT via integrated ±3A sink-source linear regulator referenced to VDDQ/2, GMCH core voltage via dual LDO, and CPU/GMCH VTT via third LDO. Its design ensures precise voltage tracking, glitch-free state transitions, and hardware-enforced fault protection - all within a single 28-pin QFN package.
Does the ISL6537CRZR5160 support both DDR2 and DDR3 memory standards?
The ISL6537CRZR5160 is explicitly specified for DDR and DDR2 memory systems per its datasheet (FN9142 Rev 6.00), supporting VDDQ down to 0.8V and VTT = VDDQ/2 with ±2% tolerance - matching DDR2 JEDEC requirements (1.8V VDDQ, 0.9V VTT). It does not support DDR3's 1.5V VDDQ or 0.75V VTT specifications, nor does its datasheet reference DDR3 timing, voltage ranges, or qualification testing. For DDR3, Renesas offers later-generation controllers such as the ISL6542.
How does the ISL6537CRZR5160 implement overcurrent protection without a sense resistor?
The ISL6537CRZR5160 implements MOSFET rDS(ON)-based overcurrent protection using the OCSET pin. An internal 20µA current source flows through an external ROCSET resistor to generate a reference voltage. When the voltage drop across the upper MOSFET's rDS(ON) exceeds this reference during conduction, the overcurrent comparator triggers soft-start cycling (hiccup mode). This method eliminates the power loss and board space of a traditional current-sense resistor while maintaining accurate trip thresholds calibrated to the actual MOSFET used in the design.
What is the role of the VIDPGD pin on the ISL6537CRZR5160?
The VIDPGD pin on the ISL6537CRZR5160 is an open-drain logic output that indicates the operational status of the VTT_GMCH/CPU linear regulator. During S0/S1/S2 states, VIDPGD is pulled high only when the VTT_GMCH/CPU rail remains within ±2% of its target voltage (0.74V typical); it asserts low upon undervoltage fault. In all other sleep states (S3/S4/S5), VIDPGD is forced low regardless of rail condition. This pin enables system firmware or PMICs to verify termination rail health before enabling memory access or transitioning out of deep sleep.
Can the ISL6537CRZR5160 be used in a single-channel DDR2 configuration?
Yes, the ISL6537CRZR5160 can be used in single-channel DDR2 configurations. Its architecture supports independent control of both DDR channels - unused channels may be left unconnected or configured for lower current. The VDDQ, VTT_DDR, VREF_OUT, and DDR_VTTSNS pins remain fully functional for one channel, while the GMCH core and CPU/GMCH VTT LDOs continue to operate as intended. Designers should follow the datasheet's single-DIMM layout guidelines and retain all required bypass capacitors and feedback networks for stability and regulation accuracy.
ISL6537CRZR5160 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)
ISL6537CRZR5160 FAQ
1.How can I place an order for ISL6537CRZR5160 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6537CRZR5160 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 ISL6537CRZR5160 reliable?
The price and inventory of ISL6537CRZR5160 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6537CRZR5160 is usually 5 days.
3.What payment methods are accepted for ISL6537CRZR5160?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6537CRZR5160 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6537CRZR5160?
ISL6537CRZR5160 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6537CRZR5160 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 ISL6537CRZR5160?
For technical support, including ISL6537CRZR5160 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6537CRZR5160 requirements.
6.How does Aetrix verify that ISL6537CRZR5160 is sourced from the original manufacturer or authorized distributors?
All ISL6537CRZR5160 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 ISL6537CRZR5160 meets industry standards.
7.What is the process for return or replacement of ISL6537CRZR5160?
All ISL6537CRZR5160 units undergo pre-shipment inspection (PSI). If there is an issue with ISL6537CRZR5160, 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 ISL6537CRZR5160 part is unused and in its original packaging.
Return procedure for ISL6537CRZR5160:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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