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Renesas ISL6522CBZ
- Part No.:
- ISL6522CBZ
- Manufacturer:
- Renesas
- Category:
- DC DC Switching Controllers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6522CBZ.pdf
- Description:
- IC REG CTRLR BUCK 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,006
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Product details
Overview
ISL6522CBZ from Renesas Electronics (formerly Intersil) is a voltage-mode PWM controller IC for synchronous buck DC-DC converters targeting high-performance microprocessor power delivery. It drives two N-channel MOSFETs, delivers 0.8V reference with ±1% regulation over line/temperature, supports 50kHz–1MHz programmable switching frequency, and implements rDS(ON)-based overcurrent protection without external sense resistors. It is used in Pentium® and PowerPC® CPU core voltage regulators.
For engineers reviewing the ISL6522CBZ datasheet, ISL6522CBZ pinout, ISL6522CBZ application, or ISL6522CBZ equivalent, key selection considerations include its 14-lead SOIC (Pb-free) package, single-loop voltage-mode control architecture, 15MHz error amplifier GBW, 0–100% duty cycle capability, and integrated soft-start with 10µA current source.
Technical Context
The ISL6522CBZ implements a fixed-frequency, voltage-mode PWM control loop using an internal 200kHz free-running oscillator adjustable via RT-to-GND or RT-to-VCC resistor networks. Its error amplifier features 15MHz gain-bandwidth and 6V/µs slew rate to support fast transient response in microprocessor VRMs.
Overcurrent protection operates by comparing the voltage drop across the upper MOSFET's rDS(ON) (monitored at PHASE) against a reference set by an internal 200µA OCSET current source and external ROCSET resistor - eliminating discrete current-sense components. The controller supports bidirectional current flow (source/sink), enabling active current sinking during load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Control Architecture | Voltage-mode PWM with single feedback loop; enables stable compensation using standard Type II/III networks. |
| Reference Voltage | 0.800V ±1% (commercial temp range); enables precise low-voltage regulation required for modern CPU cores. |
| Switching Frequency | Programmable 50kHz to >1MHz via RT pin; allows optimization of size, efficiency, and transient response. |
| Error Amplifier GBW | 15MHz; supports high closed-loop bandwidth for sub-microsecond load step recovery. |
| Duty Cycle Range | 0–100%; permits full input-to-output voltage conversion range including 100% conduction for low-dropout operation. |
| OC Protection Method | rDS(ON)-based sensing with internal 200µA current source; removes need for power-wasting sense resistor and associated PCB area. |
| Soft-Start Current | 10µA constant current into external SS capacitor; provides controlled, predictable output ramp with minimal external component count. |
Pinout & Package
ISL6522CBZ is housed in a 14-lead Pb-free SOIC package (JEDEC MS-012, pkg drawing M14.15), with exposed pad not present. Thermal resistance θJA = 67°C/W (typical, on high-conductivity board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OCSET) | Overcurrent threshold programming | Connects to drain of upper MOSFET via ROCSET; sets IPEAK trip point using internal 200µA current source and rDS(ON). |
| 2 (SS) | Soft-start timing node | Accepts external capacitor charged/discharged by 10µA current source to control startup ramp time and fault recovery. |
| 3 (EN) | Enable/disable control | Open-collector input; pull below 1V to disable PWM, discharge SS, and hold UGATE/LGATE low. |
| 4 (COMP) | Error amplifier output | Provides compensated feedback signal to PWM comparator; connects to compensation network (R/C) external to IC. |
| 5 (FB) | Error amplifier inverting input | Connects to voltage divider from output; compares regulated output against 0.8V internal reference. |
| 6 (RT) | Oscillator frequency setting | Resistor-to-GND or resistor-to-VCC sets switching frequency from 50kHz to >1MHz per documented equations. |
| 7 (VCC) | Bias supply input | Accepts +12V ±10% main bias rail; powers internal circuitry and gate drivers (UGATE/LGATE). |
| 8 (LGATE) | Lower MOSFET gate driver output | Sources/sinks up to 450mA peak; drives gate of synchronous rectifier MOSFET with 3.5–6.5Ω typical sink impedance. |
| 9 (PGND) | Power ground return | Low-impedance return path for lower MOSFET source and power-stage currents; must be tied directly to PCB power ground plane. |
| 10 (BOOT) | Bootstrap supply for high-side driver | Provides floating bias for UGATE driver; requires external bootstrap capacitor between BOOT and PHASE pins. |
| 11 (UGATE) | Upper MOSFET gate driver output | Sources up to 500mA peak; drives gate of high-side N-MOSFET with adaptive shoot-through protection. |
| 12 (PHASE) | High-side switch node monitor | Connects to source of upper MOSFET; used for rDS(ON) overcurrent sensing and as return path for BOOT capacitor. |
| 13 (GND) | Signal ground reference | Analog and digital reference for all internal circuits except power-stage returns; must be star-connected to PGND at single point. |
| 14 (PVCC) | Lower gate driver bias | Separate 12V supply input for LGATE driver; improves noise immunity and drive strength independent of VCC. |
Key Features
| Feature | Design Value |
|---|---|
| rDS(ON)-based overcurrent protection | Eliminates external current-sense resistor, reducing BOM cost, PCB area, and power loss while maintaining accurate peak-current limiting. |
| 0–100% duty cycle operation | Enables dropout operation down to near-zero input-output differential, critical for high-current, low-voltage CPU core supplies. |
| 15MHz error amplifier GBW | Supports >500kHz closed-loop bandwidth, enabling <5µs recovery from 50% load steps in optimized designs. |
| Programmable 50kHz–1MHz oscillator | Allows trade-off between magnetic component size (higher fSW) and conduction losses (lower fSW) without changing IC. |
| Separate PVCC pin for LGATE | Isolates lower gate driver supply from main VCC noise, improving stability and drive robustness in high-dI/dt environments. |
Applications
| Microprocessor Core Voltage Regulation | High-Power 5V-to-3.xV DC-DC Conversion |
|---|---|
Use Scenario: Regulating core voltage for Intel Pentium® and PowerPC® processors requiring tight tolerance (±1%), fast transient response (<10µs), and high current (>30A). IC Role / Device Role / Timing Role: Primary PWM controller managing synchronous buck topology, providing voltage-mode feedback, gate drive, and overcurrent protection. Use Value: Enables compliance with CPU VID specifications and dynamic voltage scaling while minimizing output capacitance through high-bandwidth control. | Use Scenario: Converting 5V intermediate bus to 3.3V/2.5V/1.8V rails for ASICs, FPGAs, and memory subsystems in telecom and computing equipment. IC Role / Device Role / Timing Role: Central controller for high-efficiency, high-density point-of-load (POL) converter with programmable frequency and soft-start. Use Value: Reduces solution footprint vs. older controllers via 0–100% duty cycle and eliminates sense resistor, lowering thermal stress on PCB. |
| Low-Voltage Distributed Power Supplies | Active Current-Sinking VRMs |
Use Scenario: Providing tightly regulated sub-1V outputs (e.g., 0.9V, 0.85V) in distributed power architectures for multi-core SoCs and AI accelerators. IC Role / Device Role / Timing Role: Precision voltage regulator IC delivering ±1% accuracy over temperature and line, with integrated protection and startup sequencing. Use Value: Achieves required regulation accuracy without external trimming or calibration, simplifying qualification and production test. | Use Scenario: Supporting bidirectional current flow in advanced VRMs that must sink current during rapid load release (e.g., CPU C-state transitions). IC Role / Device Role / Timing Role: Synchronous buck controller with adaptive shoot-through protection and current-sinking capability enabled by dual gate drivers and PHASE monitoring. Use Value: Prevents VIN rail overvoltage during current sinking by coordinating UGATE/LGATE timing, avoiding damage to input capacitors or MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6535 | Drop-in enhanced version with improved thermal performance, tighter reference tolerance (±0.5%), and extended frequency range (up to 1.5MHz). | Same SOIC-14 footprint and pinout; supports higher current density and more aggressive transient requirements. | Select ISL6535 for new designs requiring higher accuracy or higher switching frequencies; ISL6522CBZ remains valid for legacy-replacement or cost-sensitive builds. |
| TPS54620 | TI part with integrated high-side MOSFET, 4.5–17V input, 0.6V reference, and current-mode control (vs. voltage-mode). | Monolithic solution reduces external component count but lacks rDS(ON) OC sensing and separate PVCC; different compensation structure. | Choose TPS54620 when board space is constrained and integrated FET suffices; ISL6522CBZ preferred when discrete MOSFET selection, efficiency tuning, or rDS(ON) sensing is required. |
Compared with ISL6535, the ISL6522CBZ offers proven reliability in legacy systems but has looser reference tolerance and lower max frequency; versus TPS54620, it provides greater design flexibility with external FETs and rDS(ON) sensing, at the cost of higher external component count and voltage-mode compensation complexity.
Availability
ISL6522CBZ is available at Aetrix Electronics and suitable for microprocessor core voltage regulation, high-power 5V-to-3.xV DC-DC conversion, and low-voltage distributed power supplies requiring stable component supply and long-term industrial availability.
Supply support for ISL6522CBZ 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 Corporation is a global semiconductor leader formed from the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power management, and timing solutions.
The ISL6522CBZ belongs to Renesas' high-performance analog power management product line, designed specifically for precision, high-current DC-DC voltage regulation in computing and communications infrastructure.
FAQ
What is the operating temperature range for the ISL6522CBZ?
The ISL6522CBZ is specified for commercial temperature operation from 0°C to +70°C ambient. Its junction temperature must remain within 0°C to +125°C under normal operating conditions. This range aligns with desktop and embedded computing applications where ambient airflow and heatsinking are controlled, and it matches the "C" grade designation in the ordering information table.
Does the ISL6522CBZ require an external current-sense resistor for overcurrent protection?
No, the ISL6522CBZ does not require an external current-sense resistor. It implements overcurrent protection by monitoring the voltage drop across the upper MOSFET's rDS(ON) using the PHASE and OCSET pins, combined with an internal 200µA current source. This method eliminates power loss and PCB area associated with discrete sense resistors, as confirmed in the Functional Pin Descriptions and Overcurrent Protection sections of the FN9030 datasheet.
What package type and lead finish does the ISL6522CBZ use?
The ISL6522CBZ uses a 14-lead SOIC package (JEDEC MS-012, pkg drawing M14.15) with Pb-free plus anneal termination - fully RoHS compliant and compatible with both SnPb and Pb-free soldering processes. The "Z" suffix in the part number explicitly denotes the Pb-free variant, as stated in the Ordering Information section of the datasheet.
Can the ISL6522CBZ operate with a 5V input supply instead of 12V?
Yes, the ISL6522CBZ supports operation from either +5V or +12V input supplies, as stated in the Features section. However, the recommended operating condition specifies VCC = +12V ±10%, and the absolute maximum rating for VCC is +15.0V. When using +5V, ensure all gate drive requirements (especially for UGATE via BOOT) and bias margins for internal circuitry remain met - consult the Electrical Specifications table for VCC supply current and enable thresholds under 5V conditions.
How is the switching frequency programmed on the ISL6522CBZ?
The switching frequency of the ISL6522CBZ is programmed via the RT pin using an external resistor. Connecting RT to GND increases frequency above the nominal 200kHz; connecting RT to VCC decreases it. The exact relationship is given by two equations in the datasheet: Fs ≈ (200kHz × 5 × 10⁶)/RT (pull-down) and Fs ≈ (200kHz × 4 × 10⁷)/RT (pull-up), enabling adjustment from below 50kHz to over 1MHz.
ISL6522CBZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 14-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):
- 10.8V ~ 13.2V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Phase Control, Soft Start
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
ISL6522CBZ FAQ
1.How can I place an order for ISL6522CBZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6522CBZ 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 ISL6522CBZ reliable?
The price and inventory of ISL6522CBZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6522CBZ is usually 5 days.
3.What payment methods are accepted for ISL6522CBZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6522CBZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6522CBZ?
ISL6522CBZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6522CBZ 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 ISL6522CBZ?
For technical support, including ISL6522CBZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6522CBZ requirements.
6.How does Aetrix verify that ISL6522CBZ is sourced from the original manufacturer or authorized distributors?
All ISL6522CBZ 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 ISL6522CBZ meets industry standards.
7.What is the process for return or replacement of ISL6522CBZ?
All ISL6522CBZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6522CBZ, 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 ISL6522CBZ part is unused and in its original packaging.
Return procedure for ISL6522CBZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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