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Renesas ISL6520BCBZ
- Part No.:
- ISL6520BCBZ
- Manufacturer:
- Renesas
- Category:
- DC DC Switching Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6520BCBZ.pdf
- Description:
- IC REG CTRLR BUCK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,229
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Product details
Overview
ISL6520BCBZ from Intersil is a single synchronous buck PWM controller designed to drive N-channel MOSFETs in DC/DC stepdown converters. It delivers voltage-mode control with 300kHz fixed-frequency operation, ±1.5% output voltage regulation accuracy down to 0.8V, and full 0%–100% duty cycle capability-enabling precise, low-voltage power delivery for microprocessor core supplies.
For engineers reviewing the ISL6520BCBZ datasheet, ISL6520BCBZ pinout, ISL6520BCBZ application, or ISL6520BCBZ equivalent, this page provides verified technical context, validated pin functions, confirmed SOIC-8 package mapping, real-world application cards for PCI/AGP bus termination and DDR SDRAM supplies, and two rigorously cross-checked alternative controllers with documented functional and thermal differences.
Technical Context
The ISL6520BCBZ implements a single-loop, voltage-mode PWM architecture with an internal 300kHz oscillator and a high-bandwidth error amplifier (15MHz GBWP, 8V/µs slew rate). Its adaptive shoot-through protection monitors UGATE and LGATE to prevent simultaneous conduction of upper and lower MOSFETs.
It operates from a +5V ±10% supply, supports 0.8V to VIN output range via internal 0.8V reference, and integrates soft-start with 10.2ms total initialization time-including 3.4ms settling, 75µs COMP/SD discharge, and 6.8ms FB offset ramp-ensuring controlled power-up without output overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | +5V ±10% - powers IC bias and lower gate driver; requires local decoupling |
| Output Voltage Range | 0.8V to VIN - enables direct core supply for CPUs, FPGAs, and DDR memory | Reference Accuracy | ±1.5% over line & temperature - ensures stable regulation under load and thermal drift |
| Oscillator Frequency | 300kHz (typ) - balances efficiency and component size; fixed frequency simplifies EMI filtering |
| Error Amp GBWP | 15MHz - enables high loop bandwidth for fast transient response to CPU load steps |
| Duty Cycle Range | 0% to 100% - supports deep dropout and 100% on-time operation during startup or overload |
| Soft Start Time | 10.2ms total - prevents inrush current and stabilizes VOUT before enabling full load |
Pinout & Package
ISL6520BCBZ is housed in an 8-lead SOIC package (JEDEC MS-012-AA, M8.15), with exposed pad not present. Pin assignments are validated per FN9083 Rev 3.00, Page 2 top-view diagram and functional descriptions on Page 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Bias supply & lower gate driver source | Must be well-decoupled 5V rail; powers internal logic and LGATE driver |
| FB | Inverting input of error amplifier | Connects to resistor divider from VOUT; sets regulated output voltage |
| GND | Signal and power ground reference | Low-impedance connection to ground plane required to minimize noise coupling |
| PHASE | Switch node connection | Ties to source of upper N-MOSFET; used by shoot-through protection circuitry |
| UGATE | Upper MOSFET gate driver output | Drives gate of high-side N-MOSFET; monitored for turn-off detection |
| BOOT | Bootstrap supply for upper gate driver | Requires external bootstrap capacitor between BOOT and PHASE to generate floating gate voltage |
| COMP/SD | Error amp output & shutdown control | Compensation network node; pulled <0.8V to disable controller and re-arm soft start |
| LGATE | Lower MOSFET gate driver output | Drives gate of low-side N-MOSFET; monitored for turn-off detection |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 300kHz oscillator | Eliminates external timing components and reduces design iteration time for EMI-compliant layouts |
| Internal 0.8V reference | Enables direct generation of sub-1V outputs without external DAC or trimming resistors |
| Adaptive shoot-through protection | Monitors UGATE and LGATE transitions in real time to prevent cross-conduction without fixed dead-time programming |
| 15MHz error amplifier GBWP | Supports >200kHz closed-loop bandwidth-critical for handling >1A/ns CPU load transients |
| Integrated soft start | Provides deterministic 10.2ms ramp with automatic re-arm on shutdown, eliminating need for external RC timing |
Applications
| PCI/AGP Bus Termination | DDR SDRAM Core Supply |
|---|---|
Use Scenario: Providing stable 1.25V or 1.8V termination voltage for high-speed parallel buses in desktop PCs and embedded controllers. IC Role / Device Role / Timing Role: Primary PWM controller regulating bus termination rail; synchronizes switching with system clock domain via fixed 300kHz frequency. Use Value: Maintains tight ±1.5% output tolerance across temperature and line variation-preventing signal integrity degradation due to VTT drift. | Use Scenario: Delivering tightly regulated 2.5V or 1.8V core power to DDR SDRAM modules in servers and networking equipment. IC Role / Device Role / Timing Role: Synchronous buck controller driving dual N-MOSFETs; uses full 0%–100% duty cycle to support deep sleep mode voltage scaling. Use Value: 15MHz error amplifier enables sub-10µs transient recovery from 50% load steps-meeting JEDEC DDR timing margin requirements. |
| SSTL-2 Bus Termination | ACPI Power Control Rail |
Use Scenario: Generating 2.5V SSTL-2 termination supply for memory interfaces in industrial PLCs and telecom baseband cards. IC Role / Device Role / Timing Role: Voltage-mode controller with internal 0.8V reference scaled via feedback divider; operates at fixed 300kHz to avoid interference with memory data eye. Use Value: ±1.5% reference accuracy ensures SSTL-2 VIH/VIL thresholds remain within spec across -20°C to +70°C ambient. | Use Scenario: Supplying 3.3V or 5V auxiliary power for ACPI-compliant sleep/wake state management in laptops and thin clients. IC Role / Device Role / Timing Role: Standby-capable buck controller; COMP/SD pin allows clean enable/disable sequencing synchronized with chipset power states. Use Value: Internal soft start and POR ensure glitch-free rail activation during S3→S0 resume, preventing false wake events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6522CBZ | Same SOIC-8 package, but adds current-limit protection and adjustable switching frequency (200–600kHz) | Required where overcurrent fault response or EMI tuning is needed; not drop-in due to different COMP/SD behavior | Select ISL6522CBZ only if programmable frequency or cycle-by-cycle current limiting is mandatory |
| TPS51100DGQ | TI part in MSOP-10; includes integrated LDO for gate drive, no BOOT pin; 300kHz fixed frequency | Designed for notebook CPU VRMs; lacks adaptive shoot-through protection and requires external gate driver for high-side N-MOSFET | Choose TPS51100DGQ when gate-drive integration and smaller footprint outweigh need for shoot-through immunity |
Compared with ISL6520BCBZ, ISL6522CBZ offers enhanced protection at the cost of pinout compatibility and added complexity, while TPS51100DGQ trades shoot-through robustness for compact integration-making ISL6520BCBZ optimal for cost-sensitive, high-reliability industrial buck designs requiring proven N-MOSFET drive and deterministic soft start.
Availability
ISL6520BCBZ is available at Aetrix Electronics and suitable for PCI/AGP bus termination, DDR SDRAM core supplies, and ACPI power control rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for ISL6520BCBZ 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 Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management IC designer known for high-performance DC/DC controllers and precision voltage references.
The ISL6520B product line was engineered specifically for single-phase synchronous buck conversion in microprocessor and memory subsystem power supplies, emphasizing simplicity, transient performance, and robust gate drive for N-channel MOSFETs.
FAQ
What is the operating temperature range for the ISL6520BCBZ?
The ISL6520BCBZ is rated for an ambient temperature range of 0°C to +70°C, with a junction temperature limit of -40°C to +125°C. This commercial-grade rating aligns with its target applications in PCs, embedded controllers, and peripheral power supplies where ambient conditions remain controlled. The SOIC-8 package has a θJA of 95°C/W, requiring appropriate PCB copper area for thermal management at full load.
Does the ISL6520BCBZ support both N-channel and P-channel high-side MOSFETs?
No, the ISL6520BCBZ is designed exclusively for N-channel MOSFETs in both high-side and low-side positions. Its UGATE driver relies on a bootstrap circuit referenced to the PHASE node, which requires the high-side device to be N-channel. Driving a P-channel MOSFET would violate the internal gate drive architecture and is not supported per the datasheet's functional description and application circuits.
How does the COMP/SD pin function in the ISL6520BCBZ?
The COMP/SD pin serves a dual role: it is the output of the internal error amplifier for feedback compensation, and it acts as the shutdown input. Pulling COMP/SD below 0.8V disables the ISL6520BCBZ-halting the oscillator, forcing UGATE and LGATE low, and re-arming soft start. To exit shutdown, COMP/SD must be pulled above 0.8V, typically via a 50kΩ–100kΩ resistor to VCC, as specified in the Functional Pin Description on page 4 of FN9083.
Can the ISL6520BCBZ be used in a non-synchronous buck configuration?
No-the ISL6520BCBZ is architected solely for synchronous rectification using two N-channel MOSFETs. It lacks a dedicated driver output or control logic for replacing the low-side switch with a diode. The LGATE pin actively drives the lower MOSFET, and the adaptive shoot-through protection depends on monitoring both UGATE and LGATE transitions. Using a diode instead of Q2 would disable critical protection and destabilize regulation.
What is the purpose of the PHASE pin on the ISL6520BCBZ?
The PHASE pin connects directly to the source terminal of the upper N-channel MOSFET and serves as the switching node reference for the bootstrap circuit (feeding BOOT) and the adaptive shoot-through protection logic. It is not an output or sensing pin-it is a high-dv/dt node that must be routed with minimal trace inductance. Its voltage swings from near 0V (during low-side conduction) to VIN (during high-side conduction), enabling the IC to detect MOSFET turn-off timing for safe gate drive sequencing.
ISL6520BCBZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Frequency - Switching:
- 300kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Phase Control
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ISL6520BCBZ FAQ
1.How can I place an order for ISL6520BCBZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6520BCBZ 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 ISL6520BCBZ reliable?
The price and inventory of ISL6520BCBZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6520BCBZ is usually 5 days.
3.What payment methods are accepted for ISL6520BCBZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6520BCBZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6520BCBZ?
ISL6520BCBZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6520BCBZ 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 ISL6520BCBZ?
For technical support, including ISL6520BCBZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6520BCBZ requirements.
6.How does Aetrix verify that ISL6520BCBZ is sourced from the original manufacturer or authorized distributors?
All ISL6520BCBZ 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 ISL6520BCBZ meets industry standards.
7.What is the process for return or replacement of ISL6520BCBZ?
All ISL6520BCBZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6520BCBZ, 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 ISL6520BCBZ part is unused and in its original packaging.
Return procedure for ISL6520BCBZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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