My Inquiry
My Account
Renesas ISL6539CAZ-T
- Part No.:
- ISL6539CAZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ISL6539CAZ-T.pdf
- Description:
- IC REG CTRL DDR DRAM 2OUT 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,329
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL6539CAZ-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 systems. It delivers two regulated outputs (0.9V–5.5V), supports DDR-I/DDR2 VTT tracking with bidirectional current sourcing/sinking, and features voltage-feed-forward ramp modulation, 300kHz synchronized PWM, and integrated overvoltage/undervoltage/overcurrent protection.
For engineers reviewing the ISL6539CAZ-T datasheet, ISL6539CAZ-T pinout, ISL6539CAZ-T application, or ISL6539CAZ-T equivalent, this device is selected 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 operation, VDDQ/VTT tracking, and robust fault protection are required.
Technical Context
The ISL6539CAZ-T implements current-mode control with input voltage feed-forward to reject VIN transients and simplify loop compensation. Its dual PWM channels operate synchronously at 300kHz (±15%) with programmable phase shift (0°, 90°, or 180°) determined by VIN and DDR pin state.
In DDR mode (DDR = HIGH), Channel 2 regulates VTT to track VDDQ/2 using OCSET2 as a feedback node and PG2/REF as a buffered 1.25V reference output capable of sourcing 10mA; Channel 1 provides primary VDDQ regulation with independent PGOOD assertion, while Channel 2's PGOOD is disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Input Voltage | +3.3V or +5V to +18V - supports direct connection to system rails or unregulated 5–15V sources without external LDO |
| PWM Frequency | 300kHz (TYP), 255–345kHz (MIN/MAX) - fixed-frequency operation enables predictable EMI filtering and LC component selection |
| Output Voltage Range | 0.9V to 5.5V per channel - set via external resistor divider on VSEN pins; enables DDR VDDQ (e.g., 2.5V) and VTT (1.25V) |
| VTT Tracking Accuracy | VTT = VDDQ/2 ±1% - achieved via buffered reference and matched internal gain paths in DDR mode |
| Overvoltage Protection | 115% of set point - clamps output by holding lower MOSFET ON and upper OFF, then auto-resumes when decayed below threshold |
| Soft-Start Current | 4.5µA (TYP) - charges external capacitor to control ramp rate of output voltage, preventing inrush current |
| Thermal Resistance θJA | 80°C/W (QSOP-28) - defines maximum power dissipation before junction exceeds 125°C at 85°C ambient |
Pinout & Package
ISL6539CAZ-T is housed in a Pb-free, RoHS-compliant 28-lead QSOP package (M28.15 drawing), optimized for thermal performance and board-level manufacturability in high-density power designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,9,20) | Signal ground reference | All three pins must connect to low-inductance ground plane to ensure stable error amplifier and gate driver operation |
| UGATE1/UGATE2 (5,24) | Upper MOSFET gate drive output | Provides 4Ω pull-up / 2.3Ω pull-down drive strength to switch high-side N-channel MOSFETs in synchronous buck topology |
| LGATE1/LGATE2 (2,27) | Lower MOSFET gate drive output | Delivers 4Ω pull-up / 1.1Ω pull-down drive to control low-side MOSFETs; critical for diode emulation and dead-time control |
| VSEN1/VSEN2 (10,19) | Output voltage feedback input | Connects to resistive divider midpoint; used for regulation, PGOOD, OVP, and UVP detection with ±1% internal 0.9V reference |
| DDR (13) | Mode select control input | LOW = dual independent buck controllers; HIGH = DDR memory power solution with VTT tracking and VDDQ/2 reference generation |
| PG2/REF (16) | Dual-function terminal | In dual mode: open-drain PGOOD2; in DDR mode: buffered VDDQ/2 output (1.25V, 10mA sink/source capability) |
| OCSET1/OCSET2 (11,18) | Overcurrent threshold setting | Internal 0.9V reference source; resistor-to-ground sets current limit based on rDS(ON) sensing or external sense resistor |
| SOFT1/SOFT2 (12,17) | Soft-start timing control | 5µA internal current charges external capacitor; output ramps until SOFT ≥ 0.9V (regulation) and ≥1.5V (PGOOD enable) |
Key Features
| Feature | Design Value |
|---|---|
| DDR memory power integration | Eliminates need for separate VTT regulator and reference IC by providing VTT tracking, bidirectional current handling, and buffered VDDQ/2 output |
| Voltage-feed-forward ramp modulation | Maintains constant modulator gain across 3.3V–18V input range, enabling stable loop response without re-tuning compensation |
| Lossless rDS(ON) current sensing | Reduces BOM count and conduction losses by using MOSFET on-resistance instead of discrete sense resistors |
| Programmable channel phase shift | Minimizes input current ripple through 0°, 90°, or 180° inter-channel PWM offset-selected automatically by VIN and DDR pin state |
| Comprehensive fault protection | Independent OVP (115%), UVP (75%), and adjustable OCP per channel; latched shutdown prevents repeated fault cycling |
Applications
| Graphics Card GPU Core Supply | DDR2 Memory Termination (VTT) |
|---|---|
Use Scenario: Powering GPU core logic requiring tightly regulated 1.0–1.3V at up to 5A with fast load transient response. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller delivering independent VCORE and VIO rails; Channel 1 regulates GPU core voltage, Channel 2 supplies I/O interface. Use Value: Voltage-feed-forward and current-mode control achieve <5% output deviation during 2A/µs load steps, reducing need for large bulk capacitance. | Use Scenario: Providing termination voltage (VTT) for DDR2 SDRAM modules operating at 1.8V VDDQ. IC Role / Device Role / Timing Role: Configured in DDR mode to make Channel 2 track VDDQ/2 (0.9V) with bidirectional current sourcing/sinking capability. Use Value: Eliminates external op-amp buffer and discrete current source/sink circuitry, reducing footprint by >30% and improving tracking accuracy to ±1%. |
| Server Memory Subsystem | FPGA I/O Bank Supply |
Use Scenario: Generating VDDQ (2.5V) and VTT (1.25V) for multi-rank DDR3 memory banks in enterprise servers. IC Role / Device Role / Timing Role: Dual PWM controller operating in DDR mode with VIN tied to 5V to enforce 90° phase shift, minimizing shared input rail noise. Use Value: 90° interleaving reduces peak input current by 30% versus in-phase operation, easing input capacitor sizing and thermal design. | Use Scenario: Supplying configurable 1.2V–3.3V I/O bank voltages for Xilinx/Altera FPGAs with dynamic voltage scaling requirements. IC Role / Device Role / Timing Role: Used as dual independent buck controller (DDR = LOW) with separate VSEN dividers to set distinct output voltages per bank. Use Value: Independent EN1/EN2 pins allow staggered power-up sequencing across FPGA banks, preventing inrush current violations during configuration. |
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-T | Single-channel 300kHz PWM controller with integrated MOSFET drivers; lacks DDR mode, VTT tracking, and second channel | Suitable only for single-output applications; cannot replace ISL6539CAZ-T in dual-rail or DDR systems | Select only when designing single-output buck converters without DDR requirements |
| RT8205AZSP | Dual-channel PWM controller with 500kHz switching, but no built-in DDR mode or VDDQ/2 reference; requires external circuitry for VTT | Supports higher frequency for smaller magnetics, but adds complexity and cost for DDR memory designs | Consider for non-DDR dual-buck applications needing higher frequency or different protection thresholds |
Compared with ISL6539CAZ-T, ISL6522CRZ-T provides half the functionality and cannot support DDR memory power architecture, while RT8205AZSP offers higher switching frequency but requires external components to replicate DDR-specific functions like VTT tracking and buffered reference generation.
Availability
ISL6539CAZ-T is available at Aetrix Electronics and suitable for graphics card power delivery, DDR memory subsystems, and FPGA I/O supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6539CAZ-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) is a global semiconductor leader specializing in microcontrollers, analog power management, and timing solutions for industrial, automotive, and computing markets.
The ISL6539CAZ-T belongs to Renesas' legacy Intersil power management product line, engineered specifically for high-performance memory and graphics power delivery with integrated DDR compliance, dual-channel synchronization, and robust fault protection.
FAQ
What is the maximum input voltage rating for the ISL6539CAZ-T?
The ISL6539CAZ-T has an absolute maximum input voltage rating of +18.0V on the VIN pin. Operation is specified across a recommended range of +3.3V or +5.0V to +18.0V, supporting both system rail and unregulated DC inputs. Exceeding +18.0V risks permanent damage to internal circuitry, including the ramp generator and gate drivers.
How does the ISL6539CAZ-T implement VTT tracking in DDR mode?
In DDR mode (DDR pin HIGH), the ISL6539CAZ-T configures Channel 2 to regulate VTT by connecting OCSET2 to a resistor divider that senses VDDQ/2. The internal error amplifier compares this signal to the 0.9V reference, and PG2/REF outputs the buffered VDDQ/2 voltage (e.g., 1.25V for 2.5V VDDQ). This architecture enables precise, low-drift tracking without external op-amps.
Can the ISL6539CAZ-T operate with only one channel enabled?
Yes, the ISL6539CAZ-T supports independent channel control via EN1 and EN2 pins. Driving EN1 HIGH and EN2 LOW enables only Channel 1, while EN2 HIGH and EN1 LOW enables only Channel 2. Both channels can be disabled simultaneously for ultra-low quiescent current (1µA typical ICCSN), making ISL6539CAZ-T suitable for partial-power-down architectures.
What protection features are included in the ISL6539CAZ-T?
The ISL6539CAZ-T integrates overvoltage protection (115% of set point), undervoltage protection (75% of set point), and adjustable overcurrent protection per channel. It also includes VCC undervoltage lockout (4.14V falling threshold), soft-start controlled PGOOD assertion, and adaptive dead-time control to prevent shoot-through-ensuring robust operation in demanding power systems.
Is the ISL6539CAZ-T pin-compatible with other members of the ISL6539 family?
Yes, the ISL6539CAZ-T shares identical pinout and package (28-lead QSOP) with ISL6539IAZ-T and ISL6539CRZ-T. All variants differ only in temperature grade (C-grade: -40°C to +85°C; I-grade: -40°C to +85°C with tighter oscillator tolerance) and minor electrical specifications-not physical layout-enabling drop-in replacement within the same thermal and PCB constraints.
ISL6539CAZ-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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP/QSOP
ISL6539CAZ-T FAQ
1.How can I place an order for ISL6539CAZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6539CAZ-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 ISL6539CAZ-T reliable?
The price and inventory of ISL6539CAZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6539CAZ-T is usually 5 days.
3.What payment methods are accepted for ISL6539CAZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6539CAZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6539CAZ-T?
ISL6539CAZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6539CAZ-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 ISL6539CAZ-T?
For technical support, including ISL6539CAZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6539CAZ-T requirements.
6.How does Aetrix verify that ISL6539CAZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6539CAZ-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 ISL6539CAZ-T meets industry standards.
7.What is the process for return or replacement of ISL6539CAZ-T?
All ISL6539CAZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6539CAZ-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 ISL6539CAZ-T part is unused and in its original packaging.
Return procedure for ISL6539CAZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL6539CAZ-T Tags
-
TPS51206DSQR
Texas Instruments
-
TPS51200DRCR
Texas Instruments
-
TPS51200DRCT
Texas Instruments
-
TPS62740DSSR
Texas Instruments
-
TPS51100DGQR
Texas Instruments
-
NCP51200MNTXG
onsemi
-
NCP51400MNTXG
onsemi
-
RT9026GSP
Richtek USA Inc.
-
LP2998MRX/NOPB
Texas Instruments
-
TPS51200QDRCRQ1
Texas Instruments
-
DPA423GN-TL
Power Integrations
-
LM10011SD/NOPB
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
