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Renesas ISL6528CB-T
- Part No.:
- ISL6528CB-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6528CB-T.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,794
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Product details
Overview
ISL6528CB-T from Intersil is a dual-output power controller integrating a standard buck PWM regulator (for high-current GPU supply) and a linear regulator (for lower-current memory supply), operating at 600kHz, delivering ±2% output voltage regulation over line/load/temperature, with user-adjustable outputs from 0.8V to 3.3V in an 8-lead SOIC package - designed for graphics card power delivery.
For engineers reviewing the ISL6528CB-T datasheet, ISL6528CB-T pinout, ISL6528CB-T application, or ISL6528CB-T equivalent, key selection considerations include its dual-regulator architecture, independent undervoltage fault monitoring on both FB and FB2, soft-start sequencing, 5V bias requirement, and compatibility with N-channel MOSFET + NPN bipolar pass transistor topologies.
Technical Context
The ISL6528CB-T implements voltage-mode PWM control for the buck stage with a single feedback loop, full 0–100% duty ratio, and high-bandwidth error amplifier (15MHz GBWP, 6V/µs slew rate); the linear regulator uses a dedicated error amplifier driving DRIVE2 with 120mA output current capability and matched ±2% regulation tolerance.
Both regulators share a common 0.800V internal reference (±1.6% system accuracy), synchronized soft-start (3.42ms typical), and independent undervoltage detection (52.5% VREF threshold on FB/FB2). Fault events trigger simultaneous shutdown and hiccup-mode restart after 10.5ms delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual-output: buck PWM + linear regulator - enables discrete GPU + memory rail generation without external controllers |
| Switching Frequency | 600kHz ±50kHz - enables compact magnetics and low-output-ripple design with fast transient response |
| Output Voltage Range | 0.8V to 3.3V (both rails) - supports modern GPU core and GDDR memory voltage requirements |
| Regulation Accuracy | ±2% over line, load, and temperature - ensures stable operation across thermal and load variations in graphics cards |
| Reference Voltage | 0.800V ±1.6% - sets precision feedback threshold for both regulators; defines minimum programmable output |
| Soft-Start Duration | 3.42ms typical - prevents inrush current and ensures controlled, sequenced ramp-up of both outputs |
| UV Fault Threshold | 52.5% of VREF (≈0.42V) on FB and FB2 - triggers immediate dual-rail shutdown to protect downstream ICs |
Pinout & Package
ISL6528CB-T is housed in an 8-lead SOIC package (M8.15 footprint, 1.27mm pitch), RoHS-compliant with Pb-free anneal finish, rated for 0°C to 70°C ambient operation and 150°C max junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal ground reference | Primary return path for all internal circuits; requires low-impedance via to ground plane |
| VCC (Pin 2) | Bias supply input | Accepts +5V ±10% supply; monitored for POR (4.4V threshold) and powers internal logic/drivers |
| DRIVE2 (Pin 3) | Linear regulator base drive | Supplies base current to external NPN pass transistor; delivers up to 120mA peak |
| FB2 (Pin 4) | Linear regulator feedback input | Senses linear output via resistor divider; regulated to 0.8V; also enables shutdown when >1.28V |
| FB (Pin 5) | Buck regulator feedback input | Inverting input of buck error amplifier; senses PWM output; enables UV fault detection |
| COMP (Pin 6) | Buck error amplifier output | Provides compensation node for voltage-mode loop; connects to external RC network |
| BOOT (Pin 7) | Bootstrap capacitor connection | Connects to PHASE node via 0.47µF capacitor; supplies gate drive energy for high-side MOSFET |
| UGATE (Pin 8) | High-side MOSFET gate driver | Drives N-channel MOSFET gate with <5Ω source/sink impedance; supports 1A peak current |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation | Simultaneous control of high-current buck (GPU) and low-current linear (memory) rails with separate FB pins and fault monitoring |
| Integrated soft-start | Single digital soft-start sequence ramps both outputs synchronously, preventing cross-regulation issues and inrush stress |
| Undervoltage lockout (UVLO) | Dual-rail UV detection (52.5% VREF) with automatic hiccup-mode recovery - eliminates need for external supervisors |
| Single 5V bias supply | Eliminates need for auxiliary bias rails; VCC powers both regulators, drivers, and internal references |
| Full-duty-cycle PWM | 0–100% duty ratio support enables low-VOUT operation (e.g., 0.8V from 3.3V input) without dropout limitation |
| Linear controller drive strength | 120mA DRIVE2 output sustains stable operation with high-gain NPN transistors under full load and thermal stress |
Applications
| Graphics Card GPU Supply | Graphics Card Memory Supply |
|---|---|
|
Use Scenario: Powering NVIDIA or AMD GPU cores requiring tightly regulated, high-current 1.0–1.3V supplies with fast transient response. IC Role / Device Role / Timing Role: ISL6528CB-T acts as primary buck PWM controller driving upper N-MOSFET; regulates VOUT1 via FB/COMP loop with voltage-mode control. Use Value: ±2% regulation and 600kHz switching enable compact, low-noise GPU rail design meeting PCIe graphics card form factor constraints. |
Use Scenario: Delivering stable 1.8–2.5V supply to GDDR3/GDDR5 memory modules on discrete graphics cards. IC Role / Device Role / Timing Role: ISL6528CB-T operates linear regulator stage via DRIVE2/FB2, providing low-noise, ripple-free bias independent of buck switching noise. Use Value: Dedicated linear control avoids coupling switching noise into memory rails, preserving signal integrity and timing margins. |
| ASIC Core Supply | Embedded Processor I/O Supply |
|
Use Scenario: Generating precise, low-drift core voltage for high-performance ASICs in networking or storage accelerators. IC Role / Device Role / Timing Role: ISL6528CB-T configures buck stage for ASIC core rail (e.g., 1.2V @ 20A) and linear stage for auxiliary logic (e.g., 3.3V @ 1A). Use Value: Dual-rail integration reduces BOM count and PCB area versus discrete controllers, while shared soft-start ensures safe power-up sequencing. |
Use Scenario: Providing clean, sequenced I/O voltage (e.g., 3.3V or 2.5V) for ARM-based embedded processors in industrial HMIs or edge AI modules. IC Role / Device Role / Timing Role: ISL6528CB-T uses linear regulator output as low-noise I/O rail; buck stage supplies processor core, with coordinated UV fault response. Use Value: Independent FB2 monitoring protects I/O interfaces from brownout-induced data corruption during transient load events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522IRZ | Single-output buck controller only; no integrated linear regulator; 300kHz switching; different pinout and compensation scheme | Requires external linear regulator circuit for second rail - increases component count and layout complexity | Choose only if second rail is not required or can be implemented externally with tighter cost constraints |
| RT8059NGQW | Dual buck controller (no linear stage); 1.2MHz switching; integrated MOSFET drivers; different UV threshold (55% VREF) | Higher-frequency operation enables smaller inductors but introduces more EMI; lacks low-noise linear option for memory rails | Select when both rails demand high-efficiency switching and board space is critical; avoid when memory rail noise sensitivity is high |
Compared with ISL6522IRZ and RT8059NGQW, the ISL6528CB-T uniquely integrates a linear regulator stage - eliminating external pass transistor biasing and enabling ultra-low-noise secondary rails ideal for graphics memory, whereas alternatives require added components or compromise on noise performance.
Availability
ISL6528CB-T is available at Aetrix Electronics and suitable for graphics card GPU supplies, ASIC core power delivery, and embedded processor I/O rail generation requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6528CB-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
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in high-performance analog and power management ICs for computing, communications, and industrial applications.
The ISL6528CB-T belongs to Intersil's dual-output power controller product line, engineered specifically for graphics card and embedded processor power systems requiring co-located, independently regulated high-current and low-noise voltage rails.
FAQ
What is the maximum operating junction temperature for the ISL6528CB-T?
The ISL6528CB-T has a maximum junction temperature rating of 150°C, with thermal resistance θJA of 110°C/W in the SOIC package. This allows reliable operation in graphics card environments where ambient temperatures reach 70°C, provided adequate PCB copper area and airflow are maintained per Intersil's layout guidelines.
Does the ISL6528CB-T support adjustable output voltages below 1.0V?
Yes, the ISL6528CB-T supports output voltages down to 0.8V on both rails using external resistor dividers. The internal 0.800V reference enables precise low-voltage programming - critical for modern GPU cores - and the ±2% regulation tolerance holds across the full 0.8V–3.3V range and over temperature.
How does the ISL6528CB-T handle undervoltage faults on its two outputs?
The ISL6528CB-T monitors FB and FB2 independently with dedicated comparators set to 52.5% of the 0.8V reference (≈0.42V). If either drops below this threshold, both regulators shut down simultaneously and enter hiccup mode - restarting after a 10.5ms delay, then repeating if the fault persists - ensuring robust protection for GPU and memory subsystems.
Can the ISL6528CB-T operate with a 3.3V bias supply instead of 5V?
No - the ISL6528CB-T requires a nominal +5V bias supply on VCC, with absolute operating range of +4.5V to +5.5V. The Power-On Reset circuit triggers at 4.4V, and internal drivers (UGATE, DRIVE2) are optimized for 5V operation; using 3.3V will prevent proper startup and gate drive functionality.
What external components are mandatory for basic ISL6528CB-T operation?
Mandatory components include: (1) 0.47µF bootstrap capacitor between BOOT and PHASE, (2) input bypass capacitor (CBP) near VCC, (3) resistor dividers on FB and FB2 for output setting, (4) output inductor and capacitors for the buck stage, and (5) N-channel MOSFET + NPN transistor for power stages. The ISL6528CB-T cannot function without these.
ISL6528CB-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 600kHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- Controller
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISL6528CB-T FAQ
1.How can I place an order for ISL6528CB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6528CB-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 ISL6528CB-T reliable?
The price and inventory of ISL6528CB-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6528CB-T is usually 5 days.
3.What payment methods are accepted for ISL6528CB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6528CB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6528CB-T?
ISL6528CB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6528CB-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 ISL6528CB-T?
For technical support, including ISL6528CB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6528CB-T requirements.
6.How does Aetrix verify that ISL6528CB-T is sourced from the original manufacturer or authorized distributors?
All ISL6528CB-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 ISL6528CB-T meets industry standards.
7.What is the process for return or replacement of ISL6528CB-T?
All ISL6528CB-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6528CB-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 ISL6528CB-T part is unused and in its original packaging.
Return procedure for ISL6528CB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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