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Renesas ISL6539CAZ
- Part No.:
- ISL6539CAZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ISL6539CAZ.pdf
- Description:
- IC REG CTRL DDR DRAM 2OUT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,154
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Product details
Overview
ISL6539CAZ from Intersil is a wide-input-range dual PWM controller optimized for DDR memory power delivery and dual-channel synchronous buck regulation. It supports independent 0.9V–5.5V outputs or DDR mode with VTT tracking VDDQ/2 and integrated VREF generation. Key confirmed parameters: 300kHz nominal switching frequency, ±1.0% internal reference accuracy, 115% overvoltage protection threshold, 75% undervoltage latch threshold, and 28-pin QSOP package.
For engineers reviewing the ISL6539CAZ datasheet, ISL6539CAZ pinout, ISL6539CAZ application, or ISL6539CAZ equivalent, this page delivers verified technical context, validated pin functions, real-world DDR and dual-rail use cases, and two confirmed alternative controllers with documented functional differences.
Technical Context
The ISL6539CAZ integrates two current-mode PWM controllers with voltage feed-forward ramp modulation, enabling fast transient response across wide input (3.3V–15V) and output (0.9V–5.5V) ranges. Its adaptive dead-time control and diode emulation support high-efficiency synchronous rectification in both channels.
In DDR mode, it reconfigures CH2 as a bidirectional VTT sink/source regulator tracking VDDQ/2, while PG2/REF delivers a buffered 1.25V reference. Channel phase shift (0°/90°/180°) is dynamically determined by VIN pin voltage and DDR pin state-no external timing components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 300 kHz nominal; fixed-frequency PWM ensures predictable EMI profile and simplifies LC filter design. |
| Reference Voltage Accuracy | ±1.0% at 0.9 V; enables tight output regulation critical for DDR-I/DDR2 memory VDDQ and VTT tolerances. |
| Overvoltage Protection | 115% of set point; latches lower MOSFET on to clamp output during fault, then auto-resumes when decayed. |
| Undervoltage Latch Threshold | 75% of set point; shuts down channel if sustained output sag occurs, preventing system instability. |
| Soft-Start Current | 4.5 µA typical; charges external capacitor to control ramp rate, limiting inrush current during power-up. |
| Input Voltage Range | 3.3 V or 5.0 V to 15.0 V; supports direct operation from system rails or unregulated DC inputs. |
| Thermal Resistance θJA | 80 °C/W (QSOP); defines maximum power dissipation before junction exceeds 125°C at 85°C ambient. |
Pinout & Package
ISL6539CAZ is housed in a 28-lead QSOP (Quad Flat Small Outline Package), Pb-free and RoHS-compliant, with 0.65 mm lead pitch and M28.15 package drawing. All three GND pins (1, 9, 20) must be low-inductance connected to ground plane for stable operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 9, 20) | Signal ground reference | Three dedicated ground connections minimize noise coupling and ensure accurate current sensing and PGOOD assertion. |
| DDR (13) | Mode selection input | High = DDR mode (VTT tracking + VREF); Low = dual independent buck mode; determines internal error amp reference routing. |
| PG2/REF (16) | Multi-function terminal | In DDR mode: buffered VDDQ/2 output (10 mA source); in dual mode: open-drain PGOOD2 signal. |
| VIN (14) | Feed-forward & sync control | Provides input-voltage proportional ramp; also sets CH1–CH2 phase shift (0°/90°/180°) when DDR = 1. |
| OCSET1/OCSET2 (11, 18) | Overcurrent threshold setting | Buffered 0.9 V reference; resistor-to-ground sets rDS(ON)-based OCP trip point per channel. |
| SOFT1/SOFT2 (12, 17) | Soft-start timing control | Internal 4.5 µA current charges external cap; voltage ramp controls output rise time and PGOOD enable timing. |
Key Features
| Feature | Design Value |
|---|---|
| DDR Memory Power Integration | Eliminates need for separate VTT regulator and VREF buffer ICs-reduces BOM count and layout area in DDR-I/DDR2 systems. |
| Voltage Feed-Forward Control | Compensates for input ripple without external compensation components; maintains stable loop gain across 3.3V–15V input range. |
| Bidirectional VTT Regulation | CH2 sinks and sources current to maintain precise VDDQ/2 termination voltage under dynamic memory bus loading. |
| Lossless rDS(ON) Current Sensing | Uses lower MOSFET's on-resistance for OCP and current-mode control-no sense resistor power loss or board space required. |
| Independent Dual PGOOD Outputs | PG1 and PG2 assert open-drain signals after soft-start completion and within ±11% regulation window-enables sequenced system power-up. |
Applications
| DDR Memory Power Supply | Graphics Card GPU Core Supply |
|---|---|
Use Scenario: Providing VDDQ (2.5 V), VTT (1.25 V), and VREF (1.25 V) for DDR2 SDRAM on desktop/server motherboards. IC Role / Device Role / Timing Role: Dual-channel controller operating in DDR mode, where CH1 regulates VDDQ and CH2 tracks VDDQ/2 while sourcing/sinking termination current. Use Value: Single-chip solution meets JEDEC DDR2 termination specs with <±1.0% reference accuracy and bidirectional VTT current handling up to ±10 mA. | Use Scenario: Delivering tightly regulated 1.1 V core voltage and 2.5 V I/O voltage to discrete GPUs on high-end graphics cards. IC Role / Device Role / Timing Role: Dual independent buck controller with synchronized 180° phase shift, minimizing input capacitor RMS current and reducing thermal stress. Use Value: Enables >90% efficiency at 20 A load with fast transient response (<50 µs recovery) due to current-mode + feed-forward architecture. |
| FPGA I/O Bank Supply | ASIC System Rail Generation |
Use Scenario: Generating multiple low-noise, independently adjustable voltages (e.g., 1.2 V, 1.8 V, 2.5 V) for FPGA I/O banks requiring different interface standards. IC Role / Device Role / Timing Role: Dual-channel PWM controller with programmable VSEN dividers, supporting 0.9 V–5.5 V outputs and independent EN1/EN2 sequencing. Use Value: Eliminates need for discrete regulators per bank-reduces component count and improves voltage tracking accuracy across temperature (-40°C to +85°C). | Use Scenario: Powering multi-rail ASICs in telecom line cards where VDD (1.2 V), PLL (2.5 V), and auxiliary (3.3 V) supplies require coordinated startup and fault reporting. IC Role / Device Role / Timing Role: Dual synchronous buck controller with independent PGOOD1/PGOOD2 outputs and undervoltage lockout on each channel. Use Value: Enables robust power sequencing and fault isolation-prevents ASIC latch-up by latching off only the failed rail while maintaining others active. |
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 controller with integrated MOSFET drivers; no DDR mode or VTT/VREF functions. | Suitable only for single-output applications; cannot replace ISL6539CAZ in DDR or dual-rail designs without adding second IC. | Select when only one regulated output is needed and board space allows discrete VTT generation. |
| TPS51220ARUKR | TI dual-channel DDR controller with 300 kHz frequency, but uses external VREF and lacks integrated VDDQ/2 buffer on PG2/REF pin. | Requires external op-amp or reference IC for VREF; VTT regulation limited to sourcing-only unless paired with external sinking circuit. | Choose for TI-based designs where ecosystem compatibility outweighs integrated VREF/VTT convenience. |
Compared with ISL6539CAZ, ISL6522CRZ offers simpler single-rail control but no DDR capability, while TPS51220ARUKR provides similar dual-channel timing but requires external components to match ISL6539CAZ's complete DDR power integration.
Availability
ISL6539CAZ is available at Aetrix Electronics and suitable for DDR memory power systems, graphics card GPU supplies, FPGA I/O banks, and ASIC system rail generation requiring stable component supply across industrial temperature range (-40°C to +85°C).
Supply support for ISL6539CAZ 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) designs high-performance analog and power management ICs for computing, communications, and industrial applications.
The ISL6539CAZ belongs to Intersil's DDR power controller product line, engineered specifically to consolidate VDDQ, VTT, and VREF generation into a single IC for DDR-I and DDR2 memory subsystems.
FAQ
What is the operating temperature range for the ISL6539CAZ?
The ISL6539CAZ is rated for industrial ambient temperature range of -40°C to +85°C, with junction temperature operating up to +125°C. This specification is confirmed in the "Recommended Operating Conditions" table on page 4 of FN9144 Rev 6.00. The ISL6539CAZ maintains full parameter performance-including 300 kHz oscillator stability, ±1.0% reference accuracy, and proper DDR mode functionality-across this full range.
Does the ISL6539CAZ support DDR3 memory applications?
No, the ISL6539CAZ is explicitly designed for DDR-I and DDR2 memory power requirements, as stated in the "Features" section on page 1 of FN9144 Rev 6.00. It does not support DDR3-specific features such as VDDQ = 1.5 V ± 0.075 V with tighter tracking, or DDR3's differential VREF requirement. For DDR3, Renesas recommends newer controllers like the ISL6537 or ISL6522 family derivatives.
How does the ISL6539CAZ implement overcurrent protection?
The ISL6539CAZ implements adjustable overcurrent protection (OCP) by monitoring the voltage drop across the lower MOSFET's rDS(ON) via the ISEN1/ISEN2 pins. An internal current source biases the OCSET1/OCSET2 pins (buffered 0.9 V reference), and a resistor from OCSETx to ground sets the trip threshold. When sensed voltage exceeds the threshold, an 8-clock-cycle latch triggers shutdown-confirmed in the "Electrical Specifications" table on page 5 and "Theory of Operation" on page 10 of FN9144 Rev 6.00.
Can the ISL6539CAZ operate with a 3.3 V input supply?
Yes, the ISL6539CAZ supports operation from a 3.3 V system rail, as specified in the "Recommended Operating Conditions" table on page 4 of FN9144 Rev 6.00. In this configuration, the VCC pin must still be supplied with 5.0 V ±5%, while VIN accepts 3.3 V or 5.0 V to 15.0 V. The controller maintains full functionality-including DDR mode, soft-start, and PGOOD assertion-under 3.3 V VIN operation.
What is the function of the PG2/REF pin in DDR mode?
In DDR mode (DDR pin = high), the PG2/REF pin becomes the output of a buffered VDDQ/2 voltage amplifier, delivering a precision 1.25 V reference capable of sourcing up to 10 mA-exactly matching DDR2 memory VREF requirements. This is distinct from its dual-mode function as an open-drain PGOOD2 signal. The behavior is defined in the "Functional Pin Description" on page 5 and "Typical Application" on page 7 of FN9144 Rev 6.00, and applies specifically to the ISL6539CAZ.
ISL6539CAZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP/QSOP
ISL6539CAZ FAQ
1.How can I place an order for ISL6539CAZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6539CAZ 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 ISL6539CAZ reliable?
The price and inventory of ISL6539CAZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6539CAZ is usually 5 days.
3.What payment methods are accepted for ISL6539CAZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6539CAZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6539CAZ?
ISL6539CAZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6539CAZ 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 ISL6539CAZ?
For technical support, including ISL6539CAZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6539CAZ requirements.
6.How does Aetrix verify that ISL6539CAZ is sourced from the original manufacturer or authorized distributors?
All ISL6539CAZ 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 ISL6539CAZ meets industry standards.
7.What is the process for return or replacement of ISL6539CAZ?
All ISL6539CAZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6539CAZ, 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 ISL6539CAZ part is unused and in its original packaging.
Return procedure for ISL6539CAZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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