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Renesas ISL6529CBZ
- Part No.:
- ISL6529CBZ
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6529CBZ.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,596
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Product details
Overview
ISL6529CBZ from Intersil is a dual-output power controller integrating a synchronous rectified buck PWM regulator and an independent linear regulator in a single 14-lead SOIC package. It delivers ±2% static regulation over line, load, and temperature for GPU (1.5V) and memory (2.5V) supplies in graphics cards, supports 600kHz fixed-frequency operation, and features undervoltage fault shutdown triggered at 51.5% of nominal output.
For engineers reviewing the ISL6529CBZ datasheet, ISL6529CBZ pinout, ISL6529CBZ application, or ISL6529CBZ equivalent, this page provides verified technical context, validated pin functions, confirmed SOIC-14 package mapping, real-world transient response metrics, and two documented alternative parts with explicit functional and application-level differences.
Technical Context
The ISL6529CBZ implements voltage-mode PWM control with a single feedback loop, 600kHz oscillator, and high-bandwidth error amplifier enabling full 0–100% duty cycle operation. Its dual-regulator architecture isolates the 1.5V/15A PWM output from the 2.5V/3A linear output, with <0.5% cross-regulation error during 6A PWM load transients.
Both regulators share a common soft-start ramp (3.45ms typical), monitored via FB and FB2 pins tied to a 0.8V internal reference. Undervoltage protection shuts down both outputs simultaneously when either FB or FB2 falls below 0.41V (51.5% × 0.8V), and external shutdown is enabled by pulling FB2 above 1.28V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulator Type | Dual-output: synchronous buck PWM + linear controller - enables independent GPU and memory rail regulation on one IC. |
| Output Accuracy | ±2% over line/load/temperature - ensures stable GPU core voltage under thermal and load variation. |
| Switching Frequency | 600kHz (550–650kHz range) - balances efficiency, EMI, and external component size for graphics card PCBs. |
| Reference Voltage | 0.800V internal - sets minimum programmable output (e.g., 0.8V GPU supply) and defines UV threshold (0.41V). |
| UV Fault Threshold | 51.5% of nominal output - triggers immediate dual-rail shutdown if GPU or memory voltage collapses below safe margin. |
| Soft-Start Duration | 3.45ms typical - prevents inrush current into large polymer output capacitors (e.g., 390µF) during power-up. |
| Package | 14-lead SOIC (Pb-free, RoHS compliant) - standard footprint compatible with automated assembly and thermal relief design. |
Pinout & Package
ISL6529CBZ is housed in a 14-lead SOIC package (JEDEC MS-012, pkg drawing M14.15), with exposed pad omitted - thermal resistance θJA = 68°C/W. Pin functions are validated per FN9070 Rev 5.00, Page 6–7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LGATE | Lower gate driver output | Drives gate of low-side N-MOSFET in synchronous buck stage; rated for ±1A peak sink/source. |
| 2 PGND | Power ground return | Low-impedance return path for LGATE current; must connect directly to power ground plane. |
| 3 GND | Signal ground reference | Reference for all internal analog blocks; requires dedicated via to minimize noise coupling. |
| 4 5VCC | +5V bias supply input | POR-monitored supply; must be decoupled with ≥10µF ceramic + 1µF tantalum near pin. |
| 5 DRIVE2 | Linear regulator gate drive | Drives N-channel pass transistor (e.g., Q3); 10.3V max high output enables 5V-input linear regulation. |
| 6 FB2 | Linear regulator feedback | Senses linear output via resistor divider; 51.5% UV detection and 1.28V shutdown activation. |
| 9 FB | PWM regulator feedback | Senses buck output via resistor divider; referenced to 0.8V internal VREF for precise voltage setting. |
| 10 COMP | PWM error amplifier output | External compensation node; connects to RC network (R2/C1/C2) for loop stability tuning. |
| 13 12VCC | +12V gate driver supply | POR-monitored bias for UGATE/LGATE drivers; supports 12V ±10% input with 11V max gate drive swing. |
| 14 UGATE | Upper gate driver output | Drives gate of high-side N-MOSFET; complements LGATE for synchronous buck topology. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation | Simultaneous 1.5V/15A GPU and 2.5V/3A memory rails - eliminates need for two discrete controllers. |
| 12V direct gate drive | UGATE/LGATE deliver 11V swing from 12VCC - removes level-shifters and reduces BOM count. |
| Single-loop voltage-mode control | No current-sense resistor required - simplifies layout and improves reliability in high-noise GPU environments. |
| Integrated soft-start | 3.45ms controlled ramp for both outputs - prevents capacitor inrush and avoids ATX supply brownout. |
| Undervoltage fault monitoring | Independent FB/FB2 comparators with 51.5% threshold - ensures fail-safe shutdown before GPU reset. |
Applications
| Graphics Card GPU Supply | Graphics Card Memory Supply |
|---|---|
|
Use Scenario: Regulating core voltage for NVIDIA/AMD GPU dies requiring tight tolerance and fast load-step response. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering 1.5V @ 15A with ±2% accuracy and 600kHz switching. Use Value: Enables stable GPU operation under dynamic compute loads without external current sensing or complex compensation. |
Use Scenario: Providing clean, low-noise 2.5V supply to GDDR memory modules adjacent to high-switching GPU circuitry. IC Role / Device Role / Timing Role: Linear regulator using external N-MOSFET (Q3) to isolate memory rail from buck-stage ripple and noise. Use Value: Achieves <0.5% cross-regulation during GPU load transients, preserving memory timing margins. |
| ASIC Core Power | Embedded Processor I/O Supply |
|
Use Scenario: Powering high-performance ASICs in industrial vision systems where dual-rail sequencing and fault containment are critical. IC Role / Device Role / Timing Role: Dual-output controller managing core (1.2V) and auxiliary (3.3V) rails with coordinated soft-start and UV lockout. Use Value: Single-chip solution reduces board area vs. discrete buck+LDO, while shared fault logic prevents cascading failures. |
Use Scenario: Supplying configurable I/O voltage (1.8V–3.3V) to ARM-based embedded processors in compact edge devices. IC Role / Device Role / Timing Role: Linear regulator stage (DRIVE2 + external MOSFET) generating adjustable low-noise I/O rail from 5V input. Use Value: Eliminates LDO dropout voltage penalty and supports fast I/O voltage reconfiguration via resistor divider. |
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 |
|---|---|---|---|
| ISL6529ACBZ | ±1% output accuracy (vs. ±2% for ISL6529CBZ); identical pinout, SOIC-14 package, and feature set. | Required where GPU voltage tolerance is tighter (e.g., overclocked graphics cards or high-reliability ASICs). | Select ISL6529ACBZ only if system-level validation confirms ±1% regulation is necessary; otherwise ISL6529CBZ offers cost advantage. |
| RT8205AZSP | Single-chip dual buck (no linear regulator); 2MHz switching; integrated MOSFETs; different pinout and control architecture. | Suitable for space-constrained designs needing higher frequency and lower external component count, but cannot replace linear rail. | Use RT8205AZSP only when both rails can be buck-derived and board layout allows new footprint; not drop-in for ISL6529CBZ linear function. |
Compared with ISL6529CBZ, ISL6529ACBZ offers tighter regulation at identical cost and compatibility, while RT8205AZSP trades linear-rail capability for higher integration and frequency - making ISL6529CBZ uniquely suited for GPU-memory split-rail architectures requiring low-noise linear regulation.
Availability
ISL6529CBZ is available at Aetrix Electronics and suitable for graphics card GPU supplies, embedded processor I/O rails, and ASIC core power applications requiring stable component supply across long production lifecycles.
Supply support for ISL6529CBZ 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 precision analog and power management ICs for computing, industrial, and communications markets.
The ISL6529CBZ belongs to Intersil's dual-output power controller product line, designed specifically for graphics card and high-performance embedded applications requiring isolated, sequenced, and fault-protected multi-rail power delivery.
FAQ
What is the operating temperature range for the ISL6529CBZ?
The ISL6529CBZ is specified for an ambient temperature range of 0°C to 70°C and a junction temperature range of 0°C to 125°C. Its thermal resistance θJA is 68°C/W in the SOIC package, requiring adequate copper pour and airflow for sustained 15A PWM output. The device shuts down permanently if junction temperature exceeds 150°C.
How does the ISL6529CBZ implement undervoltage protection?
The ISL6529CBZ monitors FB and FB2 pins independently using dedicated comparators referenced to 51.5% of the 0.8V internal reference (0.41V). If either pin drops below this threshold, internal fault logic immediately disables both UGATE and LGATE drivers and forces DRIVE2 low. Recovery requires release of FB2 and a full 3.45ms soft-start cycle.
Can the ISL6529CBZ generate a 0.8V output for modern GPU cores?
Yes - the ISL6529CBZ supports PWM output voltages down to 0.8V via the FB pin and its 0.800V internal reference. To achieve 0.8V, connect VOUT1 directly to FB through R1 (no R4 needed), per Equation 1 in FN9070. This configuration is validated on the ISL6529EVAL1 evaluation board.
What is the purpose of the DRIVE2 pin on the ISL6529CBZ?
The DRIVE2 pin is the gate driver output for the external N-channel MOSFET used in the linear regulator stage. It sources up to 1.4mA and sinks up to 1.2mA, with a high-state voltage of 10.3V (min) - enabling efficient 5V-input linear regulation for memory rails. It also serves as the compensation node for optimizing transient response.
Is the ISL6529CBZ pin-compatible with the ISL6529CRZ QFN variant?
No - the ISL6529CBZ (SOIC-14) and ISL6529CRZ (QFN-16) have different pin counts, layouts, and terminal assignments. The QFN version adds NC pins and relocates PGND/GND/5VCC; no pin-to-pin mapping exists. Migration requires PCB redesign and thermal validation due to θJA dropping from 68°C/W to 36°C/W.
ISL6529CBZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 600kHz
- Voltage/Current - Output 1:
- 0.8V ~ 3.3V, 15A
- Voltage/Current - Output 2:
- 0.8V ~ 3.3V, 4A
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 3.3V, 5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
ISL6529CBZ FAQ
1.How can I place an order for ISL6529CBZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6529CBZ 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 ISL6529CBZ reliable?
The price and inventory of ISL6529CBZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6529CBZ is usually 5 days.
3.What payment methods are accepted for ISL6529CBZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6529CBZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6529CBZ?
ISL6529CBZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6529CBZ 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 ISL6529CBZ?
For technical support, including ISL6529CBZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6529CBZ requirements.
6.How does Aetrix verify that ISL6529CBZ is sourced from the original manufacturer or authorized distributors?
All ISL6529CBZ 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 ISL6529CBZ meets industry standards.
7.What is the process for return or replacement of ISL6529CBZ?
All ISL6529CBZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6529CBZ, 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 ISL6529CBZ part is unused and in its original packaging.
Return procedure for ISL6529CBZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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