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Renesas HIP6521CBZ
- Part No.:
- HIP6521CBZ
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
HIP6521CBZ.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,089
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Product details
Overview
HIP6521CBZ from Intersil is a PWM and triple linear power controller IC designed for motherboard power regulation in high-performance microprocessor systems. It integrates one voltage-mode synchronous buck PWM controller (for 2.5V memory core) and three bipolar NPN-based linear controllers (for 1.5V AGP, 2.5V clock, and 1.8V North/South Bridge), all with ±2% static output regulation over line, load, and temperature, housed in a 16-lead SOIC package.
For engineers reviewing the HIP6521CBZ datasheet, HIP6521CBZ pinout, HIP6521CBZ application, or HIP6521CBZ equivalent, key selection considerations include its four independently regulated outputs, rDS(ON)-based overcurrent sensing for the PWM channel, ACPI-compatible linear regulator shutdown via FB pin pull-up, fixed 300 kHz switching frequency, and requirement for external bipolar pass transistors on linear outputs.
Technical Context
The HIP6521CBZ implements a single-loop voltage-mode PWM control architecture with a 300 kHz oscillator, high-bandwidth error amplifier (15 MHz GBWP, 6 V/μs slew rate), and full 0–100% duty cycle capability. Its PWM section monitors overcurrent using the upper MOSFET's rDS(ON) voltage drop referenced to PHASE, eliminating need for discrete current-sense resistors.
All three linear regulators employ dedicated error amplifiers with undervoltage monitoring at FB2/FB3/FB4 pins (trip threshold: 70% of 0.8 V reference), and each supports independent ACPI-controlled shutdown by pulling the respective FB pin above 1.25 V. Soft-start is integrated and fixed at 6.83 ms nominal, initiating simultaneously across all four outputs upon VCC POR detection (4.25–4.5 V rising threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PWM Switching Frequency | 300 kHz ±25 kHz - enables compact magnetics and predictable EMI profile without requiring external frequency programming. |
| Output Voltage Reference | 0.800 V ±0% - stable internal bandgap reference used for all four regulated outputs; sets accuracy baseline for resistor-divider programming. | Output Regulation Accuracy | ±2% over line/load/temperature - ensures tight voltage tolerance for sensitive microprocessor subsystems including memory core and chipset logic. |
| PWM Overcurrent Trip Source | Internal 40 µA current sink at OCSET pin - configures trip point via external ROCSET resistor and upper MOSFET rDS(ON); eliminates sense resistor and associated power loss. |
| Linear Regulator Drive Current | 120 mA max per DRIVE pin - sufficient base drive for external bipolar NPN pass transistors operating under full load and thermal stress. |
| Soft-Start Interval | 6.83 ms typical - controls ramp rate of all four outputs to limit inrush current during system power-up; not user-adjustable. |
| Operating Temperature Range | 0°C to +70°C ambient - validated for commercial-grade motherboard environments; junction limit is 125°C. |
Pinout & Package
Package: 16-lead SOIC (M16.15), RoHS-compliant Pb-free plus anneal finish, 0°C to +70°C ambient rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRIVE2 (Pin 1) | Base drive output for linear regulator 2 (2.5V clock) | Supplies up to 120 mA base current to external NPN transistor; requires external emitter-follower configuration. |
| FB2 (Pin 2) | Inverting input for linear regulator 2 error amplifier | Regulated to 0.8 V; undervoltage detection triggers shutdown if pulled below 70% of reference (0.56 V). |
| FB (Pin 3) | Inverting input for PWM controller error amplifier | Connects to resistor divider from VOUT1; primary feedback node for 2.5V memory core regulation. |
| COMP (Pin 4) | Error amplifier output for PWM controller | Provides compensation node for voltage-mode loop stability; connects to RC network for pole/zero placement. |
| GND (Pin 5) | Signal ground reference | Reference point for all analog circuitry; must be isolated from PGND to avoid noise coupling into control loops. |
| PHASE (Pin 6) | Switch node connection for PWM buck converter | Monitors upper MOSFET source voltage for rDS(ON)-based overcurrent detection; ties directly to Q1 source. |
| BOOT (Pin 7) | Bootstrap supply for UGATE driver | Requires 0.47 µF capacitor to PHASE; enables high-side gate drive above VCC rail for synchronous rectification. |
| UGATE (Pin 8) | High-side MOSFET gate driver output | Drives Q1 gate with ±1 A peak current; operates from bootstrap voltage, not VCC directly. |
| PGND (Pin 9) | Power ground return | Low-impedance return path for PWM switch currents; must connect to Q2 source and bulk input capacitor negative terminal. |
| LGATE (Pin 10) | Low-side MOSFET gate driver output | Drives Q2 gate with ±2 A sink/source capability; optimized for fast turn-on/turn-off of synchronous rectifier. |
| VCC (Pin 11) | Bias supply and logic power rail | Accepts +5 V ±10%; powers internal logic, linear drivers, and provides gate bias charge for LGATE/DRIVE outputs. |
| OCSET (Pin 12) | Overcurrent trip threshold setting | 40 µA current sink sets VSET = IOCSET × ROCSET; comparator trips when VDS(ON) > VSET. |
| DRIVE3 (Pin 13) | Base drive output for linear regulator 3 (1.8V ICH/MCH) | Same drive capability as DRIVE2; enables independent control of chipset core voltage regulation. |
| FB4 (Pin 14) | Inverting input for linear regulator 4 (1.5V AGP) | Identical function to FB2/FB3; supports ACPI shutdown via 1.25 V pull-up. |
| DRIVE4 (Pin 15) | Base drive output for linear regulator 4 (1.5V AGP) | Full 120 mA drive supports high-current AGP bus regulation with external NPN pass device. |
| FB3 (Pin 16) | Inverting input for linear regulator 3 (1.8V ICH/MCH) | Feedback node for North/South Bridge core; undervoltage detection enables fault isolation without affecting other rails. |
Key Features
| Feature | Design Value |
|---|---|
| Four independent regulated outputs | Enables single-chip solution for memory core (2.5V), AGP bus (1.5V), clock (2.5V), and chipset core (1.8V) - reduces BOM count and layout complexity on ATX motherboards. |
| rDS(ON)-based PWM overcurrent protection | Eliminates need for external current-sense resistor and associated PCB area/power loss; trip level programmable via ROCSET with minimal component count. |
| ACPI-compatible linear regulator shutdown | Each linear output can be independently disabled by pulling its FB pin >1.25 V - supports S3/S4/S5 sleep states without modifying hardware or adding control logic. |
| Integrated soft-start with fixed timing | 6.83 ms ramp-up for all outputs prevents inrush current damage to MOSFETs, capacitors, and downstream logic; no external components required. |
| ±2% output regulation over full range | Meets tight voltage tolerance requirements of DDR memory interfaces and PCI Express clock domains; achieved via precision 0.8 V reference and low-drift error amplifiers. |
Applications
| Memory Core Power Supply | AGP Bus Power Regulation |
|---|---|
Use Scenario: Providing stable 2.5V supply to DDR SDRAM modules on desktop motherboard. IC Role / Device Role / Timing Role: HIP6521CBZ acts as primary PWM controller regulating VOUT1 via synchronous buck topology with Q1/Q2 MOSFETs. Use Value: Delivers fast transient response (<10 µs recovery) and ±2% regulation essential for memory data integrity during burst reads/writes. | Use Scenario: Generating clean 1.5V rail for Accelerated Graphics Port (AGP) interface circuitry. IC Role / Device Role / Timing Role: HIP6521CBZ operates linear regulator 4 (DRIVE4/FB4) with external NPN pass transistor to supply AGP analog front-end. Use Value: Provides low-noise, ripple-free 1.5V output without switching artifacts that could interfere with high-speed graphics signaling. |
| System Clock Power | Chipset Core Voltage |
Use Scenario: Delivering precise 2.5V supply to real-time clock (RTC) and PCIe reference clock generators. IC Role / Device Role / Timing Role: HIP6521CBZ uses linear regulator 2 (DRIVE2/FB2) to regulate VOUT2 with bipolar NPN pass device. Use Value: Ensures sub-10 mV RMS ripple and <100 ps jitter contribution - critical for maintaining timing margin in high-frequency clock distribution networks. | Use Scenario: Powering Intel ICH/MCH or AMD South/North Bridge core logic requiring tightly regulated 1.8V. IC Role / Device Role / Timing Role: HIP6521CBZ employs linear regulator 3 (DRIVE3/FB3) with external NPN transistor to supply VOUT3. Use Value: Supports dynamic ACPI state transitions (C-states) via FB3 pull-up, enabling rapid entry/exit from low-power modes without rail collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail power controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HIP6521CB | Identical electrical specifications and pinout; differs only in packaging - standard SnPb termination vs. Pb-free plus anneal finish of HIP6521CBZ. | No functional difference in motherboard designs; HIP6521CBZ required for RoHS-compliant production. | Select HIP6521CBZ for new designs targeting lead-free manufacturing; HIP6521CB remains viable for legacy repair or non-RoHS environments. |
| ISL6521CRZ | Same die, same functionality, same SOIC-16 package; Renesas rebranding after acquisition of Intersil; identical datasheet FN4837 Rev.5.00 applies. | No change in use case - direct second-source option with identical qualification and reliability data. | Use ISL6521CRZ when dual-sourcing is required for supply chain resilience; fully interchangeable with HIP6521CBZ in layout and firmware. |
Compared with HIP6521CBZ, HIP6521CB offers identical performance but lacks RoHS compliance, while ISL6521CRZ provides identical specification and qualification as a Renesas-branded second source - both require no PCB changes and maintain full functional equivalence in ATX motherboard power delivery.
Availability
HIP6521CBZ is available at Aetrix Electronics and suitable for motherboard power regulation, ATX-compliant computer systems, and embedded x86 platform designs requiring stable component supply with long-term industrial availability.
Supply support for HIP6521CBZ 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 was a U.S.-based semiconductor company specializing in power management, precision analog, and interface ICs before its acquisition by Renesas Electronics in 2017.
The HIP6521 product line was developed specifically for multi-rail voltage regulation in PC motherboard applications, integrating PWM and linear control to replace discrete solutions and reduce system-level power design complexity.
FAQ
What is the primary function of the HIP6521CBZ in a motherboard power system?
The HIP6521CBZ serves as a quad-output power controller IC, managing four critical voltage rails: a synchronous buck PWM controller for 2.5V memory core, and three linear regulators for 1.5V AGP, 2.5V clock, and 1.8V chipset core. Its integrated architecture replaces multiple discrete controllers, reducing component count and improving regulation accuracy to ±2% across all outputs in the HIP6521CBZ design.
Does the HIP6521CBZ support ACPI-compliant power state transitions?
Yes, the HIP6521CBZ supports ACPI-compliant power state transitions through independent shutdown of each linear regulator. Pulling any FB2, FB3, or FB4 pin above 1.25 V disables the corresponding linear output (2.5V clock, 1.8V chipset, or 1.5V AGP), enabling S3/S4/S5 sleep states. The HIP6521CBZ maintains this capability without external logic, making it suitable for legacy and early-2000s ATX platform designs.
How does the HIP6521CBZ implement overcurrent protection without a sense resistor?
The HIP6521CBZ implements overcurrent protection for its PWM channel using the upper MOSFET's intrinsic rDS(ON) as the current-sensing element. An internal 40 µA current sink at the OCSET pin develops a voltage across an external ROCSET resistor; when the voltage drop across the MOSFET (VDS(ON)) exceeds this setpoint, the overcurrent comparator trips. This method eliminates the need for a discrete sense resistor and associated power loss in the HIP6521CBZ application.
What is the role of the BOOT and PHASE pins in the HIP6521CBZ PWM section?
The BOOT pin on the HIP6521CBZ supplies charge to the high-side gate driver via a bootstrap capacitor connected to the PHASE node. The PHASE pin connects directly to the source of the upper MOSFET and serves as both the switching node for the buck converter and the reference point for rDS(ON)-based overcurrent detection. Together, BOOT and PHASE enable efficient synchronous rectification without requiring a floating high-voltage supply in the HIP6521CBZ design.
Can the HIP6521CBZ regulate output voltages other than the specified 1.5V, 1.8V, and 2.5V rails?
Yes, the HIP6521CBZ supports user-adjustable output voltages via external resistor dividers. The PWM output (VOUT1) can be set between VIN and 0.8 V, while each linear regulator's output is determined by its respective FBx pin divider network. All outputs maintain ±2% regulation accuracy regardless of programmed value, provided external components meet the HIP6521CBZ datasheet guidelines for resistor tolerance and parallel impedance limits.
HIP6521CBZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (3)
- Number of Outputs:
- 4
- Frequency - Switching:
- 300kHz
- Voltage/Current - Output 1:
- Controller
- Voltage/Current - Output 2:
- Controller
- Voltage/Current - Output 3:
- Controller
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
HIP6521CBZ FAQ
1.How can I place an order for HIP6521CBZ through Aetrix?
Please submit a Request for Quotation (RFQ) for HIP6521CBZ 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 HIP6521CBZ reliable?
The price and inventory of HIP6521CBZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HIP6521CBZ is usually 5 days.
3.What payment methods are accepted for HIP6521CBZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HIP6521CBZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HIP6521CBZ?
HIP6521CBZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HIP6521CBZ 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 HIP6521CBZ?
For technical support, including HIP6521CBZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HIP6521CBZ requirements.
6.How does Aetrix verify that HIP6521CBZ is sourced from the original manufacturer or authorized distributors?
All HIP6521CBZ 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 HIP6521CBZ meets industry standards.
7.What is the process for return or replacement of HIP6521CBZ?
All HIP6521CBZ units undergo pre-shipment inspection (PSI). If there is an issue with HIP6521CBZ, 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 HIP6521CBZ part is unused and in its original packaging.
Return procedure for HIP6521CBZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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