My Inquiry
My Account
Renesas ISL6529CB
- Part No.:
- ISL6529CB
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6529CB.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,077
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ISL6529CB 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 both outputs, supports 0.8V–5V adjustable output ranges, operates at 600kHz fixed frequency, and targets GPU and memory voltage regulation in graphics cards.
For engineers reviewing the ISL6529CB datasheet, ISL6529CB pinout, ISL6529CB application, or ISL6529CB equivalent, this device requires attention to its dual-regulator architecture, 12V/5V bias supply dependencies, undervoltage fault monitoring on FB/FB2 pins, soft-start sequencing behavior, and N-channel MOSFET gate drive capability for both PWM and linear stages.
Technical Context
The ISL6529CB implements two independent control loops: a voltage-mode PWM controller with 600kHz oscillator, high-bandwidth error amplifier (15MHz GBWP), and full 0–100% duty cycle range; and a separately compensated linear controller driving an external N-channel pass transistor via DRIVE2. Both regulators share a common 0.8V internal reference and synchronized soft-start ramp.
Power-on reset monitors 5VCC (4.25–4.5V rising threshold) and 12VCC (9.6–10.8V rising threshold); undervoltage protection triggers shutdown when FB or FB2 falls below 51.5% of VREF (0.41V). The SOIC package provides thermal resistance θJA = 68°C/W and operates from 0°C to 70°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Accuracy | ±2% over line, load, and temperature - ensures stable GPU/memory rail tolerance without external calibration. |
| Switching Frequency | 600kHz (550–650kHz typ.) - enables compact magnetics and filtering while balancing efficiency and EMI. |
| Reference Voltage | 0.800V internal - sets minimum programmable output voltage and defines feedback divider scaling. |
| Soft-Start Interval | 3.45ms typical - controls inrush current during power-up and prevents output overshoot. |
| UV Fault Threshold | 51.5% of VREF (0.41V) on FB/FB2 - detects >48.5% output sag and initiates coordinated shutdown. |
| Gate Drive Capability | UGATE/LGATE: ±1A peak, 3.1Ω RDS(on); DRIVE2: ±1.4mA sink/source - directly drives standard N-MOSFETs without level shifters. |
| Supply Voltage Range | 5VCC: +5V ±10%; 12VCC: +12V ±10% - matches ATX-compliant graphics card bias rails. |
Pinout & Package
ISL6529CB uses a 14-lead SOIC package (JEDEC MO-153AA, pkg drawing M14.15), with exposed pad not present. Pin functions are validated per FN9070 Rev 5.00, Page 6–7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LGATE (1) | Lower gate driver output | Drives gate of low-side N-MOSFET in synchronous buck stage; logic-level compatible with 12VCC-referenced drive. |
| PGND (2) | Power ground return | High-current return path for LGATE driver; must be connected to power ground plane near MOSFET source. |
| GND (3) | Signal ground reference | Reference for all analog circuitry (FB, COMP, REF); requires low-impedance connection to PGND at single point. |
| 5VCC (4) | +5V bias supply input | Primary IC bias rail; monitored for POR; requires local 10µF ceramic decoupling. |
| DRIVE2 (5) | Linear regulator gate driver | Drives gate of external N-channel pass transistor; includes compensation node for transient optimization. |
| FB2 (6) | Linear regulator feedback input | Senses linear output via resistor divider; regulated to 0.8V; also used for shutdown (pull >1.28V). |
| NC (7,8,11,12) | No internal connection | Unbonded pins; must remain unconnected and unstubbed on PCB. |
| FB (9) | PWM regulator feedback input | Senses buck output via resistor divider; regulated to 0.8V; fault-triggered at 0.41V. |
| COMP (10) | Error amplifier output | External compensation node for PWM loop; connects to RC network between FB and UGATE/LGATE drivers. |
| 12VCC (13) | +12V gate driver supply | Bias for UGATE/LGATE drivers; monitored for POR; requires local 10µF ceramic decoupling. |
| UGATE (14) | Upper gate driver output | Drives gate of high-side N-MOSFET; 12V-referenced output with 11V max swing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation | Simultaneous 1.5V GPU (PWM) and 2.5V memory (linear) outputs with no cross-regulation drift (<0.5% perturbation). |
| Integrated POR and soft-start | Automatic sequencing on 5VCC/12VCC rise; digital soft-start eliminates inrush spikes and ensures monotonic voltage ramp. |
| N-channel MOSFET compatibility | Direct 12V gate drive for high-side and low-side switches plus DRIVE2 output eliminates need for external level shifters or P-MOSFETs. |
| Undervoltage fault coordination | Single UV event on either FB or FB2 shuts down both regulators and initiates hiccup-mode recovery after 10.5ms delay. |
| Adjustable output range | Both outputs programmable from 0.8V to 5V using external resistor dividers - supports legacy and modern GPU core/memory voltages. |
Applications
| Graphics Card GPU Supply | Graphics Card Memory Supply |
|---|---|
Use Scenario: Regulating core voltage for NVIDIA/AMD GPUs requiring fast transient response and tight DC accuracy. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering up to 25A at 1.0–1.5V with 600kHz switching. Use Value: ±2% regulation ensures GPU stability under dynamic load; integrated soft-start prevents boot-time brownout. |
Use Scenario: Providing clean, low-noise 2.5V supply to GDDR memory banks adjacent to GPU die. IC Role / Device Role / Timing Role: Linear regulator stage using external N-MOSFET to minimize ripple and EMI near memory interface. Use Value: Independent regulation avoids coupling from PWM switching noise; <0.5% cross-talk maintains memory timing margins. |
| ASIC Core Power | Embedded Processor I/O Supply |
Use Scenario: Powering high-performance ASICs in telecom or test equipment where dual-rail sequencing is required. IC Role / Device Role / Timing Role: Dual-output controller enabling independent enable/disable and fault reporting per rail. Use Value: Coordinated soft-start and UV shutdown prevent latch-up during power-up; 0.8V min output supports advanced nodes. |
Use Scenario: Delivering configurable I/O voltage (1.8V/2.5V/3.3V) to FPGA or SoC peripherals in industrial embedded systems. IC Role / Device Role / Timing Role: Linear regulator stage supplies low-noise, low-ripple I/O rail decoupled from noisy system switching supplies. Use Value: DRIVE2 output allows use of cost-effective N-MOSFETs instead of LDOs; FB2 monitoring adds system-level fault visibility. |
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 |
|---|---|---|---|
| ISL6529ACB | ±1% regulation accuracy (vs. ±2% for ISL6529CB); identical pinout, SOIC-14 package, and functional block diagram. | Required where tighter GPU voltage tolerance is mandated by newer GPU specs or high-reliability compute workloads. | Select ISL6529ACB only if ±1% accuracy is verified necessary; otherwise ISL6529CB meets standard graphics card requirements. |
| RT8205AZSP | Single-chip dual-phase buck controller (no linear stage); 300kHz operation; different pinout and compensation topology. | Used in cost-sensitive, space-constrained designs where memory rail is supplied by separate LDO or simpler buck converter. | RT8205AZSP cannot replace ISL6529CB's linear regulator function; suitable only when redesigning memory supply architecture. |
Compared with ISL6529ACB, ISL6529CB trades 1% accuracy for broader qualification margin and lower cost; compared with RT8205AZSP, it uniquely integrates linear regulation for low-noise memory rails without requiring external components or layout changes.
Availability
ISL6529CB 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 ISL6529CB 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, power management, and interface ICs for computing, industrial, and communications markets.
The ISL6529CB belongs to Intersil's high-performance power controller product line, designed specifically for multi-rail voltage regulation in graphics processing units and embedded systems demanding tight DC accuracy and coordinated fault response.
FAQ
What is the operating temperature range for the ISL6529CB?
The ISL6529CB is specified for an ambient temperature range of 0°C to 70°C, with a maximum junction temperature of 125°C. Its SOIC package has a thermal resistance θJA of 68°C/W, requiring adequate PCB copper area and airflow in graphics card applications to maintain safe junction temperatures under full load.
How does the ISL6529CB handle undervoltage faults on its outputs?
The ISL6529CB continuously monitors FB and FB2 pins; if either drops below 51.5% of the 0.8V reference (i.e., 0.41V), both regulators shut down immediately. After a 10.5ms delay, the internal soft-start sequence restarts - entering hiccup mode if the fault persists beyond ~875ms into the next soft-start cycle.
Can the ISL6529CB regulate outputs below 0.8V?
No - the ISL6529CB's internal reference is fixed at 0.800V, and both FB and FB2 inputs are regulated to this value. Output voltages are set by resistor dividers scaling the output down to 0.8V; therefore, the lowest achievable output is 0.8V (achieved by connecting VOUT directly to FB or FB2 with no divider).
What is the purpose of the DRIVE2 pin on the ISL6529CB?
The DRIVE2 pin on the ISL6529CB drives the gate of an external N-channel MOSFET used as the pass element in the linear regulator stage. It provides adjustable gate voltage (0.1–10.3V), supports external compensation via RC networks, and enables shutdown by pulling FB2 above 1.28V - making it central to memory rail control and transient optimization.
Is the ISL6529CB pin-compatible with QFN-package variants like ISL6529CR?
No - the ISL6529CB uses a 14-lead SOIC package with specific pin assignments (e.g., NC on pins 7,8,11,12), while ISL6529CR uses a 16-lead 5×5mm QFN package with different pin count, layout, and NC placement (pins 6,7,8,11,13,15). Direct PCB replacement is not possible without layout revision.
ISL6529CB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- -
- 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
ISL6529CB FAQ
1.How can I place an order for ISL6529CB through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6529CB 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 ISL6529CB reliable?
The price and inventory of ISL6529CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6529CB is usually 5 days.
3.What payment methods are accepted for ISL6529CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6529CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6529CB?
ISL6529CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6529CB 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 ISL6529CB?
For technical support, including ISL6529CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6529CB requirements.
6.How does Aetrix verify that ISL6529CB is sourced from the original manufacturer or authorized distributors?
All ISL6529CB 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 ISL6529CB meets industry standards.
7.What is the process for return or replacement of ISL6529CB?
All ISL6529CB units undergo pre-shipment inspection (PSI). If there is an issue with ISL6529CB, 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 ISL6529CB part is unused and in its original packaging.
Return procedure for ISL6529CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ISL6529CB Tags
-
TPS6521905RHBR
Texas Instruments
-
MIC3385YHL-TR
Microchip Technology
-
A4402ELPTR-T
Allegro MicroSystems
-
LM26480SQ-AA/NOPB
Texas Instruments
-
A4402KLPTR-T
Allegro MicroSystems
-
BD71847AMWV-E2
ROHM Semiconductor
-
ADP5040ACPZ-1-R7
Analog Devices Inc.
-
LT3048IDC#TRPBF
Analog Devices Inc.
-
ADP5037ACPZ-R7
Analog Devices Inc.
-
XRP7714ILB-F
MaxLinear, Inc.
-
LTC3260EDE#TRPBF
Analog Devices Inc.
-
LTC3260EMSE#PBF
Analog Devices Inc.
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…
