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Renesas ISL6528CBZ-T
- Part No.:
- ISL6528CBZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6528CBZ-T.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,394
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Product details
Overview
ISL6528CBZ-T from Renesas (formerly Intersil) is a dual-output power controller integrating a standard buck PWM regulator and a linear regulator in a single 8-lead SOIC package. It delivers ±2% static regulation for both outputs across line, load, and temperature (0°C to 70°C), supports 0.8V–3.3V adjustable output ranges, operates at 600kHz fixed frequency, and is designed for GPU and memory voltage regulation in graphics cards.
For engineers reviewing the ISL6528CBZ-T datasheet, ISL6528CBZ-T pinout, ISL6528CBZ-T application, or ISL6528CBZ-T equivalent, key selection considerations include its dual-regulator architecture, independent undervoltage fault monitoring on FB/FB2, soft-start sequencing, 5V bias supply requirement, and Pb-free SOIC-8 packaging with RoHS compliance.
Technical Context
The ISL6528CBZ-T implements two independent control loops: a voltage-mode PWM controller driving an external N-channel MOSFET in buck topology, and a linear controller sourcing base current to an external NPN pass transistor. Its oscillator runs at 600kHz (550–650kHz typ), with integrated soft-start (3.42ms typ) and power-on reset (4.4V rising threshold).
Both regulators share a single 5V VCC bias supply and reference voltage (0.800V ±2%), with separate FB and FB2 inputs monitored by dedicated undervoltage comparators (52.5% VREF threshold). Shutdown occurs simultaneously on either FB or FB2 undervoltage fault, and FB2 >1.28V forces global shutdown with automatic soft-start recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Dual-output: buck PWM + linear regulator - enables high-current GPU rail and low-noise memory rail from one IC |
| Switching Frequency | 600kHz (550–650kHz) - enables compact magnetics and fast transient response without EMI band overlap |
| Output Voltage Range | 0.8V to 3.3V (user-adjustable via resistor dividers) - covers GPU core (1.0–1.3V) and memory (1.8–2.5V) requirements |
| Regulation Accuracy | ±2% over line/load/temperature - ensures stable operation under thermal drift and input variation in graphics cards |
| Reference Voltage | 0.800V ±2% - sets precision feedback threshold for both buck and linear outputs |
| Soft-Start Interval | 3.42ms typical - prevents inrush current and ensures controlled ramp-up of both outputs during power-up |
| UV Fault Threshold | 52.5% of VREF (≈0.42V) on FB/FB2 - triggers simultaneous shutdown if either output drops below safe operating level |
Pinout & Package
ISL6528CBZ-T is housed in an 8-lead SOIC package (M8.15 footprint, Pb-free matte tin finish), rated for 0°C to 70°C ambient operation, with θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Signal ground reference | Common return path for all internal circuits; requires low-impedance via to ground plane |
| VCC (Pin 2) | Bias supply input | Accepts +5V ±10% supply; powers internal circuitry and enables POR detection at 4.4V threshold |
| DRIVE2 (Pin 3) | Linear regulator base drive | Sources base current to external NPN pass transistor; controls VOUT2 magnitude and stability |
| FB2 (Pin 4) | Linear regulator feedback | Monitors VOUT2 via resistor divider; regulates to 0.8V and triggers global shutdown if <0.42V |
| FB (Pin 5) | Buck regulator feedback input | Inverting input of PWM error amplifier; regulates VOUT1 to 0.8V; fault threshold = 0.42V |
| COMP (Pin 6) | PWM error amplifier output | Connects to external compensation network (R/C) to stabilize voltage-mode loop dynamics |
| BOOT (Pin 7) | Bootstrap capacitor connection | Supplies gate drive energy to UGATE; requires 0.47µF capacitor to PHASE node; max 10V absolute rating |
| UGATE (Pin 8) | High-side MOSFET gate driver | Drives N-channel upper switch with 2.75Ω source / 3.0Ω sink impedance; supports full 0–100% duty cycle |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation | Simultaneous control of high-current buck (GPU) and low-current linear (memory) rails reduces board space and BOM count |
| Integrated soft-start | Single digital soft-start sequence ramps both outputs synchronously, eliminating external sequencing components |
| Global UV fault protection | Independent comparators on FB and FB2 trigger immediate shutdown of both regulators upon any output undervoltage event |
| Single 5V bias supply | Eliminates need for auxiliary supplies; simplifies system power architecture and reduces component count |
| Pb-free SOIC-8 packaging | RoHS-compliant matte tin termination compatible with SnPb and Pb-free reflow profiles per J-STD-020 |
Applications
| Graphics Card GPU Supply | Graphics Card Memory Supply |
|---|---|
Use Scenario: Regulating core voltage for high-performance GPUs requiring fast transient response and tight DC accuracy. IC Role / Device Role / Timing Role: ISL6528CBZ-T acts as the primary buck PWM controller driving the upper N-MOSFET to generate VOUT1 (e.g., 1.2V @ up to 25A). Use Value: ±2% regulation and 600kHz switching enable stable GPU operation under dynamic load changes while minimizing output filter size. |
Use Scenario: Providing low-noise, ripple-free supply to GDDR memory banks where switching noise must be avoided. IC Role / Device Role / Timing Role: ISL6528CBZ-T functions as a linear controller sourcing base current to an external NPN transistor for VOUT2 (e.g., 2.5V @ ~3A). Use Value: Linear regulation eliminates switching noise coupling into memory data paths, preserving signal integrity and timing margins. |
| ASIC Core Supply | Embedded Processor I/O Supply |
Use Scenario: Delivering tightly regulated voltage to ASIC logic cores in industrial embedded systems with limited thermal headroom. IC Role / Device Role / Timing Role: ISL6528CBZ-T serves as dual-rail controller - buck for core (0.8–1.2V), linear for auxiliary (1.8–3.3V) - with shared bias and fault logic. Use Value: Integrated UV monitoring and soft-start reduce risk of ASIC latch-up during power-up and brownout conditions. |
Use Scenario: Powering I/O banks of ARM-based processors requiring independent, low-noise voltage domains. IC Role / Device Role / Timing Role: ISL6528CBZ-T provides isolated linear regulation (VOUT2) for sensitive I/O interfaces while buck handles processor core. Use Value: Independent FB2 feedback and shutdown capability allow selective disabling of I/O rail without affecting core operation. |
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 |
|---|---|---|---|
| ISL6522CRZ-T | Single-output buck controller only; no linear regulator channel; same SOIC-8 package and 600kHz frequency | Requires external linear regulator circuit for second rail; increases design complexity and PCB area | Select when only one regulated rail is needed or when linear regulation is implemented separately |
| RT8105DGQW | Dual buck controller (no linear channel); 500kHz switching; supports 0.6–5.5V outputs; QFN-16 package | Higher integration density but lacks linear rail - unsuitable for noise-sensitive memory applications | Prefer for space-constrained designs needing two switching rails, not for mixed buck+linear use cases |
Compared with ISL6528CBZ-T, ISL6522CRZ-T omits the linear regulator entirely, requiring discrete implementation for second-rail low-noise needs, while RT8105DGQW offers dual buck topology in smaller QFN but cannot replace the noise-isolated linear function critical in graphics memory supplies.
Availability
ISL6528CBZ-T is available at Aetrix Electronics and suitable for graphics card GPU supplies, memory power delivery, and embedded processor I/O regulation requiring stable component supply, RoHS compliance, and legacy-compatible SOIC-8 packaging.
Supply support for ISL6528CBZ-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 acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio, emphasizing reliability, thermal robustness, and application-specific integration for computing and industrial markets.
The ISL6528CBZ-T belongs to Intersil's legacy dual-output power controller family, engineered specifically for graphics card power architectures requiring co-located, fault-synchronized buck and linear regulation with minimal external components.
FAQ
What is the maximum junction temperature specification for the ISL6528CBZ-T?
The ISL6528CBZ-T has a maximum junction temperature of 150°C, with a specified ambient operating range of 0°C to 70°C and thermal resistance θJA = 110°C/W in SOIC-8 packaging. This allows for reliable operation in graphics card environments when proper PCB copper area and airflow are maintained. Derating is required above 70°C ambient.
Does the ISL6528CBZ-T support adjustable switching frequency?
No, the ISL6528CBZ-T operates at a fixed 600kHz switching frequency (550–650kHz typical range), determined by its internal oscillator. Frequency adjustment is not supported - external timing resistors or capacitors are not provided, and the oscillator is not user-accessible. This simplifies design but limits EMI tuning flexibility.
Can the ISL6528CBZ-T drive a P-channel MOSFET in the buck stage?
No, the ISL6528CBZ-T is designed exclusively for N-channel high-side MOSFETs using bootstrap gate drive (via BOOT and UGATE pins). It does not support P-channel configurations, synchronous rectification, or low-side N-MOSFET drivers. The UGATE driver output impedance and BOOT architecture are optimized for N-channel high-side operation only.
What happens when the FB2 pin is pulled above 1.28V on the ISL6528CBZ-T?
Pulling and holding FB2 above 1.28V initiates immediate global shutdown of both the buck and linear regulators. Upon release, the ISL6528CBZ-T automatically enters its digital soft-start sequence, ramping both outputs synchronously back into regulation - a feature used for system-level enable/disable control without external logic.
Is the ISL6528CBZ-T pin-compatible with the ISL6528CB-T?
Yes, the ISL6528CBZ-T is functionally and physically pin-compatible with the ISL6528CB-T. Both share identical SOIC-8 pinout, electrical specifications, and thermal characteristics; the sole difference is Pb-free (ISL6528CBZ-T) versus standard leaded (ISL6528CB-T) termination, per Intersil's Pb-free plus anneal process.
ISL6528CBZ-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
ISL6528CBZ-T FAQ
1.How can I place an order for ISL6528CBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6528CBZ-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 ISL6528CBZ-T reliable?
The price and inventory of ISL6528CBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6528CBZ-T is usually 5 days.
3.What payment methods are accepted for ISL6528CBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6528CBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6528CBZ-T?
ISL6528CBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6528CBZ-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 ISL6528CBZ-T?
For technical support, including ISL6528CBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6528CBZ-T requirements.
6.How does Aetrix verify that ISL6528CBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6528CBZ-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 ISL6528CBZ-T meets industry standards.
7.What is the process for return or replacement of ISL6528CBZ-T?
All ISL6528CBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6528CBZ-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 ISL6528CBZ-T part is unused and in its original packaging.
Return procedure for ISL6528CBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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