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Renesas HIP6521CBZA-T
- Part No.:
- HIP6521CBZA-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
HIP6521CBZA-T.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,499
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Product details
Overview
HIP6521CBZA-T from Intersil is a PWM and triple linear power controller IC designed for motherboard-level regulation of four independent microprocessor system voltages: memory core (2.5V), AGP bus (1.5V), clock (2.5V), and North/South Bridge core (1.8V). It integrates a voltage-mode PWM controller with synchronous buck gate drivers (UGATE/LGATE), three bipolar NPN linear regulator drivers (DRIVE2/DRIVE3/DRIVE4), and comprehensive monitoring including rDS(ON)-based overcurrent protection and FB-pin undervoltage detection.
For engineers reviewing the HIP6521CBZA-T datasheet, HIP6521CBZA-T pinout, HIP6521CBZA-T application, or HIP6521CBZA-T equivalent, key selection criteria include its 300kHz fixed-frequency PWM operation, ±2% output voltage regulation across temperature, external resistor-adjustable outputs, integrated soft-start with 6.83ms typical interval, and compatibility with ACPI power-state sequencing via FB pin pull-up control.
Technical Context
The HIP6521CBZA-T implements a single-loop voltage-mode PWM control architecture with a 15MHz gain-bandwidth error amplifier and full 0–100% duty cycle capability, enabling fast transient response for microprocessor core loads. Its synchronous buck stage uses UGATE and LGATE to drive external MOSFETs, while OCSET and PHASE pins enable cycle-by-cycle overcurrent protection via upper MOSFET rDS(ON) sensing without auxiliary current-sense components.
All three linear regulators employ external bipolar NPN pass transistors driven by DRIVE2, DRIVE3, and DRIVE4 pins, each regulated to 0.8V reference at their respective FB2/FB3/FB4 inputs. Undervoltage monitoring on these FB pins triggers independent shutdown and soft-start recovery-critical for ACPI-compliant power sequencing in desktop motherboards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | +5V ±10% - powers internal logic, gate drivers, and base current for external NPN transistors |
| PWM Oscillator Frequency | 300 kHz (275–325 kHz range) - determines switching loss vs. filter size trade-off in buck converter design |
| Reference Voltage | 0.800 V - common feedback reference for all four regulated outputs, enabling precise resistor-divider programming |
| Output Regulation Accuracy | ±2% over line, load, and temperature - ensures stable core/bus voltages under dynamic CPU load and thermal drift |
| OCSET Current Source | 40 µA (34–46 µA) - sets PWM overcurrent trip threshold in conjunction with external ROCSET and MOSFET rDS(ON) |
| Soft-Start Interval | 6.83 ms (6.25–7.40 ms) - controls ramp rate of all four outputs to limit inrush current during system power-up |
| Linear Driver Output Current | 120 mA typical - sufficient to bias external NPN pass transistors for 1.5V/1.8V/2.5V linear regulators |
| Power-On Reset Threshold | Rising edge at 4.25–4.5 V - initiates soft-start only after VCC stabilizes within specification, preventing erratic startup |
Pinout & Package
Package: 16-lead SOIC (M16.15), Pb-free (RoHS compliant), operating ambient temperature range 0°C to 70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRIVE2 (Pin 1) | Linear regulator 2 base driver | Supplies base current to external NPN transistor regulating AGP 1.5V bus |
| FB2 (Pin 2) | Linear regulator 2 feedback input | Monitored at 0.8V reference; undervoltage here disables VOUT2 and triggers soft-start |
| FB (Pin 3) | PWM controller inverting input | Connects to resistor divider on VOUT1; primary feedback node for 2.5V memory core regulation |
| COMP (Pin 4) | PWM error amplifier output | External compensation network connects here to stabilize voltage-mode control loop |
| GND (Pin 5) | Signal ground reference | Reference point for all internal analog circuitry and feedback measurements |
| PHASE (Pin 6) | Synchronous buck switch node | Connected to source of upper MOSFET; used with OCSET to sense rDS(ON) voltage drop |
| BOOT (Pin 7) | Bootstrap capacitor connection | Drives UGATE above VCC via external 0.47µF capacitor for high-side MOSFET turn-on |
| UGATE (Pin 8) | Upper MOSFET gate driver | Provides ±1 A peak drive to gate of high-side synchronous rectifier MOSFET |
| PGND (Pin 9) | Power ground return | Low-impedance return path for synchronous buck power current; separate from signal GND |
| LGATE (Pin 10) | Lower MOSFET gate driver | Provides +2 A sink / –1 A source drive to gate of low-side MOSFET |
| VCC (Pin 11) | Bias supply input | +5V input powering IC core, gate drivers, and NPN base current; monitored for POR |
| OCSET (Pin 12) | Overcurrent set input | Internal 40µA current source develops VSET across ROCSET; trip occurs when VDS(ON) > VSET |
| DRIVE4 (Pin 13) | Linear regulator 4 base driver | Drives NPN pass transistor for 1.5V AGP bus; supports ACPI shutdown via FB4 pull-up |
| FB4 (Pin 14) | Linear regulator 4 feedback input | Regulated to 0.8V; pulling >1.25V disables VOUT4 and initiates soft-start on release |
| DRIVE3 (Pin 15) | Linear regulator 3 base driver | Supplies base current to NPN transistor regulating North/South Bridge 1.8V core |
| FB3 (Pin 16) | Linear regulator 3 feedback input | Undervoltage detection node for VOUT3; independent fault response prevents cascaded failure |
Key Features
| Feature | Design Value |
|---|---|
| Four-output integrated regulation | Single-chip solution for memory core (2.5V), AGP (1.5V), clock (2.5V), and chipset core (1.8V) eliminates discrete controller count and interconnect complexity |
| rDS(ON)-based overcurrent protection | Eliminates need for external current-sense resistors or transformers in PWM stage, reducing BOM cost and PCB area |
| ACPI-compatible linear shutdown | Individual FB pin pull-up (>1.25V) enables OS-directed power gating of AGP/clock/bridge rails without hardware redesign |
| Externally adjustable outputs | All four voltages set via standard resistor dividers - allows field tuning and compatibility with evolving platform voltage requirements |
| Integrated soft-start with synchronized recovery | Single internal ramp controls all four outputs; independent restart attempts after fault prevent system-wide lockup |
| High-bandwidth PWM error amplifier | 15 MHz GBWP and 6 V/µs slew rate support rapid load transient response required by Pentium-class CPUs |
Applications
| Memory Core Power Regulation | AGP Bus Power Regulation |
|---|---|
Use Scenario: Regulating 2.5V supply for DDR SDRAM memory modules on ATX desktop motherboards. IC Role / Device Role / Timing Role: HIP6521CBZA-T acts as the primary PWM controller driving synchronous buck converter (Q1/Q2) with UGATE/LGATE outputs and OCSET-based current limiting. Use Value: ±2% regulation ensures memory timing margins are maintained across temperature and load, while 300kHz operation minimizes inductor size without compromising transient response. | Use Scenario: Providing tightly regulated 1.5V power to Accelerated Graphics Port (AGP) slots supporting graphics cards. IC Role / Device Role / Timing Role: HIP6521CBZA-T operates linear regulator channel 4 (DRIVE4/FB4) to bias external NPN transistor for low-noise, ripple-free AGP rail. Use Value: Bipolar linear topology avoids switching noise that could interfere with analog video signals; FB4 pull-up enables ACPI S3/S4 state entry by disabling AGP power independently. |
| Clock Circuit Power Regulation | North/South Bridge Core Power |
Use Scenario: Delivering stable 2.5V supply to real-time clock (RTC) and system clock generator ICs. IC Role / Device Role / Timing Role: HIP6521CBZA-T uses linear regulator channel 2 (DRIVE2/FB2) to regulate clock rail, with undervoltage monitoring ensuring clean reset behavior. Use Value: Low-output-impedance linear regulation prevents clock jitter induced by digital switching noise; ±2% accuracy maintains frequency stability per JEDEC clock specs. | Use Scenario: Powering Intel ICH/MCH or AMD South/North Bridge chipsets requiring 1.8V core voltage. IC Role / Device Role / Timing Role: HIP6521CBZA-T employs linear regulator channel 3 (DRIVE3/FB3) to deliver 1.8V with independent fault detection and soft-start. Use Value: Independent FB3 monitoring allows bridge power to be sequenced separately from memory/core rails, satisfying chipset-specific power-up timing requirements. |
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 |
|---|---|---|---|
| HIP6521CBZ-T | Same die and functionality; differs only in packaging - HIP6521CBZ-T uses standard Pb-free SOIC without "A" suffix indicating enhanced moisture sensitivity level (MSL3 vs MSL2a) | No functional difference in motherboard designs; HIP6521CBZA-T offers tighter moisture handling per TB363 for reflow-critical high-volume assembly | Select HIP6521CBZA-T for new designs requiring documented MSL2a compliance and IPC/JEDEC J-STD-020 alignment. |
| ISL6521CRZ-T | Pin-compatible successor from Renesas (ex-Intersil); identical pinout and function but with improved thermal performance (θJA = 95°C/W vs 110°C/W) and extended VCC UVLO (3.8V–4.3V) | Drop-in replacement in existing layouts; supports higher ambient temperatures and more robust brown-out immunity in industrial PC environments | Choose ISL6521CRZ-T for new designs targeting extended temperature operation or enhanced supply rejection. |
Compared with HIP6521CBZ-T, the HIP6521CBZA-T provides identical electrical performance with certified MSL2a handling, while ISL6521CRZ-T delivers measurable thermal and UVLO improvements - making it preferable for thermally constrained or wide-input-voltage applications where long-term supply continuity is critical.
Availability
HIP6521CBZA-T is available at Aetrix Electronics and suitable for motherboard power regulation, ATX-compliant computer systems, and embedded computing platforms requiring stable component supply with RoHS-compliant packaging and MSL2a handling certification.
Supply support for HIP6521CBZA-T 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 Americas Inc. is a semiconductor company specializing in precision analog, power management, and interface ICs for computing, industrial, and communications markets.
The HIP6521 product line was engineered specifically for multi-rail voltage regulation in x86-based desktop motherboards, integrating PWM and linear control to replace discrete solutions while meeting ACPI power-state sequencing requirements.
FAQ
What is the primary function of the HIP6521CBZA-T in a computer motherboard?
The HIP6521CBZA-T serves as a quad-output power controller IC that regulates four critical system voltages: 2.5V memory core (via PWM), 1.5V AGP bus (linear), 2.5V clock (linear), and 1.8V chipset core (linear). It integrates gate drivers, error amplifiers, soft-start, and protection logic into a single 16-pin SOIC package, eliminating the need for multiple discrete controllers on ATX motherboard designs.
How does the HIP6521CBZA-T implement overcurrent protection without a current-sense resistor?
The HIP6521CBZA-T uses the upper MOSFET's intrinsic on-resistance (rDS(ON)) as a current-sense element. An internal 40µA current source flows through an external ROCSET resistor to generate a trip threshold voltage (VSET). When the voltage drop across the upper MOSFET (VDS(ON)) exceeds VSET - indicating excessive current - the overcurrent comparator triggers shutdown. This method avoids adding a dedicated sense resistor and associated power loss.
Can the HIP6521CBZA-T support ACPI power-state transitions like S3 (suspend-to-RAM)?
Yes. The HIP6521CBZA-T supports ACPI-compliant sequencing via its FB2, FB3, and FB4 pins. Pulling any of these pins above 1.25V using diode-coupled logic disables the corresponding linear regulator (clock, chipset core, or AGP bus) and places it in a low-power state. Releasing the pin initiates a controlled soft-start, enabling seamless S3/S4 entry and exit without external sequencing ICs.
What is the significance of the "A" in HIP6521CBZA-T, and how does it differ from HIP6521CBZ-T?
The "A" suffix in HIP6521CBZA-T denotes enhanced moisture sensitivity level (MSL2a per IPC/JEDEC J-STD-020), whereas HIP6521CBZ-T is rated MSL3. Both are Pb-free SOIC packages with identical electrical specifications, but HIP6521CBZA-T requires stricter handling (baking, dry pack) before reflow to prevent popcorning. This makes HIP6521CBZA-T preferred for high-reliability, high-volume manufacturing environments.
What are the key design considerations for compensating the PWM control loop of the HIP6521CBZA-T?
Compensation of the HIP6521CBZA-T's voltage-mode PWM loop requires external RC networks on COMP and FB pins. Critical parameters include placing the first zero below the LC filter double-pole (~75% of FLC), the second zero at FLC, and the second pole at half the 300kHz switching frequency. The error amplifier's 15MHz GBWP and 6V/µs slew rate allow high bandwidth, but component tolerances and PCB layout parasitics must be accounted for to maintain >45° phase margin.
HIP6521CBZA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
HIP6521CBZA-T FAQ
1.How can I place an order for HIP6521CBZA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for HIP6521CBZA-T 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 HIP6521CBZA-T reliable?
The price and inventory of HIP6521CBZA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HIP6521CBZA-T is usually 5 days.
3.What payment methods are accepted for HIP6521CBZA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HIP6521CBZA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HIP6521CBZA-T?
HIP6521CBZA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HIP6521CBZA-T 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 HIP6521CBZA-T?
For technical support, including HIP6521CBZA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HIP6521CBZA-T requirements.
6.How does Aetrix verify that HIP6521CBZA-T is sourced from the original manufacturer or authorized distributors?
All HIP6521CBZA-T 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 HIP6521CBZA-T meets industry standards.
7.What is the process for return or replacement of HIP6521CBZA-T?
All HIP6521CBZA-T units undergo pre-shipment inspection (PSI). If there is an issue with HIP6521CBZA-T, 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 HIP6521CBZA-T part is unused and in its original packaging.
Return procedure for HIP6521CBZA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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