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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Renesas ISL6539CA-T

Name: ISL6539CA-T
Brand: Renesas
SKU: ISL6539CA-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ISL6539CA-T

Manufacturer:: Renesas

Category:: Special Purpose Regulators

Package:: 28-SSOP (0.154", 3.90mm Width)

Datasheet:: ISL6539CA-T.pdf

Description:: IC REG CTRL DDR DRAM 2OUT 28SSOP

Quantity:: RFQ Add To RFQ list

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Inventory:2,937

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Product details

Overview

ISL6539CA-T from Renesas (formerly Intersil) is a wide-input dual PWM controller optimized for DDR memory power delivery and dual-channel synchronous buck regulation. It delivers tightly regulated 0.9V–5.5V outputs, supports DDR-I/DDR2 with VTT tracking and VDDQ/2 buffered reference, and features voltage-feed-forward current-mode control with 300kHz synchronized PWM operation. It is used in graphics card GPU/memory supplies and server motherboard regulators.

For engineers reviewing the ISL6539CA-T datasheet, ISL6539CA-T pinout, ISL6539CA-T application, or ISL6539CA-T equivalent, key selection criteria include its dual-mode operation (independent regulation vs. DDR mode), lossless rDS(ON) current sensing, 180°/90°/0° channel phase shift capability, integrated overvoltage/undervoltage protection, and QSOP-28 package compatibility with industrial temperature range (−40°C to +85°C).

Technical Context

The ISL6539CA-T integrates two independent current-mode PWM controllers with voltage-feed-forward ramp modulation, enabling fast transient response across input (3.3V/5V system rail or 5.0V–15V unregulated) and load variations. Its internal feedback compensation eliminates external compensation components for standard LC filter designs.

In DDR mode, it reconfigures CH2 as a bidirectional VTT tracker sourcing/sinking current while generating a buffered VDDQ/2 reference on PG2/REF; CH1 provides primary VDDQ regulation. Phase alignment (0°, 90°, or 180°) is dynamically determined by VIN pin voltage and DDR pin state.

Key Specifications

Parameter	Value and Actual Design Meaning
Oscillator Frequency	300 kHz typical - fixed-frequency PWM timing base enabling predictable EMI profile and stable loop design
Input Voltage Range	3.3V or 5.0V system rail up to 15.0V - supports both regulated bias rails and wide-range unregulated inputs
Output Voltage Range	0.9V to 5.5V per channel - programmable via external resistor dividers for SDRAM, GPU core, I/O, or ASIC supplies
VDDQ/2 Reference Accuracy	±1% at 10mA load - meets DDR memory specification for termination reference stability
Overvoltage Threshold	115% of set point - latches lower MOSFET ON to clamp output during fault, then auto-resumes
Undervoltage Threshold	75% of set point - latches channel OFF after soft-start completion if output drops below threshold
Soft-Start Current	4.5 µA typical - charges external capacitor to control ramp rate and limit inrush current

Pinout & Package

ISL6539CA-T is housed in a 28-lead QSOP (Plastic Quad Flat Small Outline Package), Pb-free (RoHS compliant), with thermal resistance θ_JA = 80°C/W. All three GND pins (1, 9, 20) must be low-inductance connected to ground plane for stable operation.

Pin/Terminal	Circuit Role	Design Meaning
EN1 / EN2 (8, 21)	Channel enable inputs	Independent logic-level enables (2.0V high, 0.8V low); both low disables IC with 1µA shutdown current
VSEN1 / VSEN2 (10, 19)	Feedback voltage sense inputs	Monitor resistive divider output; used for regulation, PGOOD, OVP, UVP - bias current ≤80 nA
ISEN1 / ISEN2 (7, 22)	Current-sense inputs	Measure r_DS(ON) voltage drop across lower MOSFETs for lossless current sensing and OCP
PG1 / PG2/REF (15, 16)	Power-good / DDR reference output	Open-drain PGOOD1; dual-function PG2/REF - PGOOD2 in dual mode, VDDQ/2 buffer (10mA capable) in DDR mode
DDR (13)	Mode select input	High = DDR mode (VTT tracks VDDQ/2, PG2/REF = buffered VDDQ/2); Low = independent dual-channel mode
VIN (14)	Feed-forward & phase-control input	Provides input-voltage proportional ramp; sets CH1/CH2 phase shift (GND=0°, 5V=90°, >4.2V=180° in DDR mode)
UGATE1 / UGATE2 (5, 24)	Upper MOSFET gate drivers	High-side PWM outputs with 4Ω pull-up / 2.3Ω pull-down (VCC = 5V) - drive external N-channel MOSFETs
LGATE1 / LGATE2 (2, 27)	Lower MOSFET gate drivers	Low-side PWM outputs with 4Ω pull-up / 1.1Ω pull-down (VCC = 5V) - support synchronous rectification

Key Features

Feature	Design Value
DDR Memory Power Integration	Single-chip solution providing VDDQ regulation, bidirectional VTT sourcing/sinking, and buffered VDDQ/2 reference - eliminates discrete op-amps and tracking circuits
Voltage-Feed-Forward Current Mode	Input-voltage proportional ramp modulation enables stable loop gain across 3.3V–15V input range without external compensation
Configurable Channel Phase Shift	0°, 90°, or 180° inter-channel PWM alignment selected via VIN pin voltage - reduces input current ripple and improves thermal distribution
Lossless r_DS(ON) Current Sensing	Eliminates sense resistor power loss and board area; supports optional external resistor for higher precision
Comprehensive Protection Suite	Integrated OVP (115%), UVP (75%), PGOOD per channel, and adjustable OCP - reduces BOM count and improves system reliability

Applications

Graphics Card GPU & Memory Supply	Server Motherboard DDR Power
Use Scenario: Dual-rail power for GPU core (VDDC) and GDDR memory (VDDQ/VTT) on PCIe graphics cards. IC Role / Device Role / Timing Role: ISL6539CA-T operates in DDR mode to regulate VDDQ, generate VTT with bidirectional current capability, and supply VDDQ/2 reference to memory ICs. Use Value: Enables compact, high-efficiency single-chip DDR power architecture meeting JEDEC DDR-I/DDR2 timing and voltage tolerance specs.	Use Scenario: Primary memory regulator on enterprise server motherboards supporting multiple DDR2 DIMMs. IC Role / Device Role / Timing Role: ISL6539CA-T delivers tightly regulated VDDQ and actively tracks VTT to VDDQ/2 with ±1% reference accuracy and fast transient response. Use Value: Guarantees signal integrity across high-speed DDR buses by maintaining precise termination voltage under dynamic load conditions.
FPGA I/O Bank Supply	ASIC Core & I/O Regulation
Use Scenario: Programmable logic board requiring separate, independently adjustable supplies for FPGA I/O banks (1.2V–3.3V) and auxiliary circuitry. IC Role / Device Role / Timing Role: ISL6539CA-T operates in dual-switcher mode with EN1/EN2 controlled separately to sequence I/O bank power-up and manage sequencing margins. Use Value: Provides two isolated, soft-started, PGOOD-monitored rails from one IC - simplifies power tree and reduces layout complexity.	Use Scenario: High-performance computing ASIC with distinct core (0.9V–1.2V) and I/O (1.8V–2.5V) voltage domains. IC Role / Device Role / Timing Role: ISL6539CA-T regulates both domains using independent VSEN dividers and configurable OCSET thresholds for domain-specific overcurrent limits. Use Value: Delivers tight load regulation (<±2%) and fast transient recovery (<10 µs) critical for ASIC timing closure and functional safety compliance.

Graphics Card GPU & Memory Supply

Server Motherboard DDR Power

Use Scenario: Dual-rail power for GPU core (VDDC) and GDDR memory (VDDQ/VTT) on PCIe graphics cards.

IC Role / Device Role / Timing Role: ISL6539CA-T operates in DDR mode to regulate VDDQ, generate VTT with bidirectional current capability, and supply VDDQ/2 reference to memory ICs.

Use Value: Enables compact, high-efficiency single-chip DDR power architecture meeting JEDEC DDR-I/DDR2 timing and voltage tolerance specs.

Use Scenario: Primary memory regulator on enterprise server motherboards supporting multiple DDR2 DIMMs.

IC Role / Device Role / Timing Role: ISL6539CA-T delivers tightly regulated VDDQ and actively tracks VTT to VDDQ/2 with ±1% reference accuracy and fast transient response.

Use Value: Guarantees signal integrity across high-speed DDR buses by maintaining precise termination voltage under dynamic load conditions.

FPGA I/O Bank Supply

ASIC Core & I/O Regulation

Use Scenario: Programmable logic board requiring separate, independently adjustable supplies for FPGA I/O banks (1.2V–3.3V) and auxiliary circuitry.

IC Role / Device Role / Timing Role: ISL6539CA-T operates in dual-switcher mode with EN1/EN2 controlled separately to sequence I/O bank power-up and manage sequencing margins.

Use Value: Provides two isolated, soft-started, PGOOD-monitored rails from one IC - simplifies power tree and reduces layout complexity.

Use Scenario: High-performance computing ASIC with distinct core (0.9V–1.2V) and I/O (1.8V–2.5V) voltage domains.

IC Role / Device Role / Timing Role: ISL6539CA-T regulates both domains using independent VSEN dividers and configurable OCSET thresholds for domain-specific overcurrent limits.

Use Value: Delivers tight load regulation (<±2%) and fast transient recovery (<10 µs) critical for ASIC timing closure and functional safety compliance.

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 controller with identical architecture; lacks DDR mode, VTT sourcing, and second PGOOD	Suitable only for single-output applications; requires external circuitry for DDR functionality	Select when only one regulated rail is needed and space/cost constraints favor smaller footprint (20-pin QFN)
TPS51220ARUKR	TI dual-channel DDR controller with integrated MOSFET drivers, 500kHz switching, and enhanced light-load efficiency	Supports DDR3/DDR4; includes adaptive phase shedding and D-CAP+ control - not pin-compatible	Prefer for new DDR3/DDR4 designs requiring higher frequency, better light-load performance, or TI ecosystem support

Compared with ISL6539CA-T, ISL6522CRZ-T offers reduced integration for simpler systems, while TPS51220ARUKR targets newer DDR generations with advanced control but requires PCB redesign due to non-compatible pinout and package.

Availability

ISL6539CA-T is available at Aetrix Electronics and suitable for graphics card power systems, server motherboard DDR regulators, and FPGA/ASIC power delivery requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL6539CA-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 ISL6539CA-T belongs to Renesas' legacy Intersil power management portfolio, designed specifically for high-efficiency, multi-rail DC/DC conversion in DDR memory and graphics subsystems - emphasizing integration, transient response, and JEDEC compliance.

FAQ

What is the operating temperature range for the ISL6539CA-T?

The ISL6539CA-T is rated for industrial temperature operation from −40°C to +85°C ambient. Its junction temperature range extends to −40°C to +125°C, and maximum junction temperature is limited to +150°C. Thermal resistance θ_JA is 80°C/W in the QSOP-28 package, requiring appropriate PCB copper area and airflow for sustained full-load operation within spec.

How does the ISL6539CA-T implement DDR memory power functionality?

The ISL6539CA-T implements DDR power by asserting the DDR pin high, which reconfigures CH2 to track VDDQ/2 using OCSET2 as a feedback node and PG2/REF as a buffered 10mA VDDQ/2 output. CH2 operates bidirectionally to source/sink VTT current, while CH1 regulates VDDQ. This eliminates need for external op-amps or discrete tracking circuits required in generic dual-buck controllers.

Can the ISL6539CA-T operate from a 3.3V input supply?

Yes - the ISL6539CA-T supports dual-mode input: it can be powered directly from a 3.3V or 5.0V system rail (applied to VCC and VIN), or from an unregulated 5.0V–15.0V DC source. When using 3.3V, the VIN pin must be tied appropriately (e.g., to 3.3V or GND) to configure phase alignment, and oscillator frequency remains at 300kHz nominal per datasheet specifications.

What protection features are built into the ISL6539CA-T?

The ISL6539CA-T integrates overvoltage protection (OVP) at 115% of set point, undervoltage protection (UVP) at 75% post-soft-start, per-channel PGOOD monitoring, and adjustable overcurrent protection (OCP) via OCSET resistors. OVP forces lower MOSFET ON to clamp output; UVP latches off the affected channel; OCP uses ISEN voltage sampling with 8-clock-cycle fault latching for noise immunity.

Is the ISL6539CA-T pin-compatible with other ISL6539 variants like ISL6539IAZ-T?

Yes - the ISL6539CA-T and ISL6539IAZ-T share identical pinout, electrical specifications, and functional behavior. The only difference is temperature grade: CA denotes −40°C to +85°C (industrial), while IA denotes −40°C to +105°C (extended industrial). Both use the same 28-lead QSOP package (M28.15) and are mechanically and electrically interchangeable where temperature requirements align.

ISL6539CA-T Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 28-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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

ISL6539CA-T FAQ

1.How can I place an order for ISL6539CA-T through Aetrix?

Please submit a Request for Quotation (RFQ) for ISL6539CA-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 ISL6539CA-T reliable?

The price and inventory of ISL6539CA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6539CA-T is usually 5 days.

3.What payment methods are accepted for ISL6539CA-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6539CA-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ISL6539CA-T?

ISL6539CA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ISL6539CA-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 ISL6539CA-T?

For technical support, including ISL6539CA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6539CA-T requirements.

6.How does Aetrix verify that ISL6539CA-T is sourced from the original manufacturer or authorized distributors?

All ISL6539CA-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 ISL6539CA-T meets industry standards.

7.What is the process for return or replacement of ISL6539CA-T?

All ISL6539CA-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6539CA-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 ISL6539CA-T part is unused and in its original packaging.

Return procedure for ISL6539CA-T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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