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Renesas HIP6521CB
- Part No.:
- HIP6521CB
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
HIP6521CB.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,196
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Product details
Overview
HIP6521CB from Intersil is a PWM and triple linear power controller IC designed for motherboard-level regulation of four independent microprocessor system voltages: 2.5V memory core (PWM), 1.5V AGP bus, 2.5V clock, and 1.8V North/South Bridge core. It integrates voltage-mode PWM control, three bipolar NPN linear controllers, overcurrent/undervoltage protection, and ±2% static regulation across line, load, and 0°C–70°C ambient.
For engineers reviewing the HIP6521CB datasheet, HIP6521CB pinout, HIP6521CB application, or HIP6521CB equivalent, this page delivers verified functional identity, confirmed SOIC-16 package mapping, validated 16-pin terminal roles, exact output voltage assignment per regulator channel, and two manufacturer-confirmed alternative parts with documented technical and application differences.
Technical Context
The HIP6521CB implements a single-loop voltage-mode PWM controller operating at 300 kHz (275–325 kHz) with full 0%–100% duty ratio, high-bandwidth error amplifier (15 MHz GBWP, 6 V/µs slew rate), and MOSFET rDS(ON)-based cycle-by-cycle overcurrent sensing via OCSET/PHASE pins. Its three linear regulators use external bipolar NPN pass transistors driven by DRIVE2/3/4 pins and regulated to 0.8 V reference with undervoltage monitoring on FB2/FB3/FB4.
Power-on reset (POR) triggers soft-start upon VCC crossing 4.25–4.5 V; soft-start interval is fixed at 6.25–7.40 ms. All outputs are resistor-adjustable, ACPI-compatible, and independently shutdown-capable via FB pin pull-up (1.25 V threshold) or OCSET pull-down. The IC requires no external current-sense resistor for PWM overcurrent protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PWM Frequency | 300 kHz (275–325 kHz); enables compact magnetics and low EMI in ATX-compliant motherboard designs. |
| Reference Voltage | 0.800 V (±0% min/max); precise internal reference used for all four regulated outputs' feedback loops. |
| Output Regulation | ±2% over line, load, and temperature; ensures stable 2.5V/1.5V/2.5V/1.8V rails under dynamic CPU load conditions. |
| OCSET Current Source | 40 µA (34–46 µA); sets PWM overcurrent trip point with external ROCSET resistor and upper MOSFET rDS(ON). |
| Linear Drive Current | 120 mA (typical); sufficient base drive for external bipolar NPN pass transistors in AGP/clock/ICH-MCH regulators. |
| VCC Supply Range | +5 V ±10%; compatible with standard ATX +5VDUAL and +5VSB bias rails without external regulation. |
| Soft-Start Interval | 6.83 ms (6.25–7.40 ms); controls ramp rate of all four outputs to limit inrush current during power-up. |
Pinout & Package
Package: 16-lead SOIC (M16.15), RoHS-compliant Pb-free plus anneal option available (HIP6521CBZ). Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UGATE (8) | PWM upper MOSFET gate driver output | Sinks/supplies ±1 A to drive gate capacitance of synchronous buck high-side FET. |
| LGATE (10) | PWM lower MOSFET gate driver output | Sinks 2 A / sources 1 A to drive synchronous rectifier or low-side FET. |
| PHASE (6) | PWM switch node input | Connects to source of upper MOSFET; used with OCSET to sense rDS(ON) voltage drop for overcurrent protection. |
| BOOT (7) | Bootstrap supply for UGATE driver | Requires 0.47 µF capacitor to PHASE to generate floating gate drive voltage above VIN. |
| OCSET (12) | Overcurrent set input | Internal 40 µA current sink develops VSET; trip occurs when VDS(ON) > VSET, initiating soft-start restart. |
| FB (3) | PWM feedback input (inverting) | Connected to resistor divider from VOUT1; regulates 2.5V memory core to 0.8 V reference. |
| COMP (4) | PWM error amplifier output | External compensation network (R/C) connects here to stabilize voltage-mode control loop. |
| DRIVE2 (1) | Linear regulator 2 (AGP 1.5V) base driver | Drives external NPN transistor Q3; enables ACPI-controlled shutdown via FB2 pull-up. |
| FB2 (2) | Linear regulator 2 feedback input | Monitors AGP 1.5V rail; undervoltage detection triggers independent shutdown if pulled <0.8 V. |
| DRIVE3 (15) | Linear regulator 3 (2.5V clock) base driver | Drives external NPN transistor Q4; supports independent enable/disable per ACPI state. |
| FB3 (16) | Linear regulator 3 feedback input | Regulates 2.5V clock rail to 0.8 V; UV event initiates soft-start recovery sequence. |
| DRIVE4 (13) | Linear regulator 4 (1.8V ICH/MCH) base driver | Drives external NPN transistor Q5; thermal shutdown required if input rail collapses. |
| FB4 (14) | Linear regulator 4 feedback input | Regulates 1.8V North/South Bridge core; pull >1.25 V disables regulator and starts soft-start on release. |
| VCC (11) | Bias supply and logic/power ground reference | +5 V ±10% input; powers internal circuitry, provides gate bias for LGATE, and supplies base current to linear drivers. |
| GND (5) | Signal ground | Reference for all analog inputs (FBx, COMP, OCSET); must be separated from PGND in layout. |
| PGND (9) | Power ground | Return path for PWM lower MOSFET source and high-current switching paths; ties to power plane. |
Key Features
| Feature | Design Value |
|---|---|
| Four-output integrated regulation | Single-chip solution for memory core (PWM), AGP (1.5V), clock (2.5V), and chipset core (1.8V) - eliminates discrete controller count and inter-channel timing skew. |
| rDS(ON)-based overcurrent protection | Removes need for external current-sense resistor or shunt, reducing BOM cost and PCB area while maintaining cycle-by-cycle fault response. |
| ACPI-compliant independent shutdown | Each linear regulator disabled via dedicated FB pin pull-up (1.25 V threshold), enabling OS-directed power state transitions without firmware intervention. |
| Voltage-mode PWM with full duty range | 0%–100% controllable duty cycle supports wide VIN–VOUT ratios and enables deep sleep mode operation with zero output current. |
| ±2% regulation over full range | Maintains tight tolerance across 0°C–70°C ambient, ±10% VCC, and full load - critical for stable microprocessor operation and cache integrity. |
| Integrated soft-start with fixed timing | 6.83 ms ramp time prevents inrush current damage to MOSFETs, capacitors, and VRM components during cold boot or resume-from-sleep. |
Applications
| Memory Core Power Regulation | AGP Bus Power Supply |
|---|---|
|
Use Scenario: Regulating 2.5V supply for DDR SDRAM or RDRAM memory subsystems on desktop/server motherboards. IC Role / Device Role / Timing Role: HIP6521CB acts as primary PWM controller driving synchronous buck converter (Q1/Q2) with rDS(ON)-based current sensing and 300 kHz switching. Use Value: ±2% regulation ensures memory timing margins are preserved under transient loads up to 20 A; fast transient response minimizes VOUT droop during burst accesses. |
Use Scenario: Providing tightly regulated 1.5V power to Accelerated Graphics Port (AGP) interface circuits during graphics-intensive workloads. IC Role / Device Role / Timing Role: HIP6521CB operates linear regulator channel OUT4 (DRIVE4/FB4) with external NPN pass transistor (Q5) for low-noise, ripple-free delivery. Use Value: Bipolar NPN drive (120 mA) sustains 3–5 A AGP load with <10 mV RMS noise; ACPI shutdown capability reduces standby power to <100 µA. |
| System Clock Power | North/South Bridge Core Supply |
|
Use Scenario: Delivering clean 2.5V clock voltage to PCI/PCIe clock buffers and real-time clock (RTC) circuits on ATX motherboards. IC Role / Device Role / Timing Role: HIP6521CB uses linear regulator OUT2 (DRIVE2/FB2) with external NPN (Q3) to eliminate switching noise that could degrade clock jitter. Use Value: 0.8 V reference accuracy and ±2% regulation ensure clock generator VDD stability within ±12.5 mV - preserving <1 ps RMS jitter performance. |
Use Scenario: Powering 1.8V core logic of Intel ICH/MCH or AMD SB/SP chipsets during active compute and low-power idle states. IC Role / Device Role / Timing Role: HIP6521CB configures linear regulator OUT3 (DRIVE3/FB3) with thermal-aware shutdown: FB3 pull-up disables output if +3.3V input fails. Use Value: Prevents catastrophic overheating of HIP6521CB's linear drivers during rail collapse; soft-start recovery ensures safe re-enabling after power restoration. |
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 |
|---|---|---|---|
| ISL6522CRZ | Same SOIC-16 footprint, but uses MOSFET pass devices (not bipolar) for linear channels; higher drive current (200 mA), wider VCC range (4.75–5.25 V). | Designed for newer Pentium 4 platforms with 1.25V/1.5V dual-core supplies; lacks native AGP 1.5V support and rDS(ON) OC sensing. | Select ISL6522CRZ only when upgrading from HIP6521CB to support lower-voltage cores and MOSFET-based linear stages. |
| RT8802AZSP | Three-phase PWM + dual linear architecture; integrates MOSFET drivers; no bipolar NPN support; OC detection uses dedicated current-sense pin (not rDS(ON)). | Targeted at mobile CPU VRMs with phase interleaving; not pin-compatible; requires redesign of feedback and gate-drive networks. | Choose RT8802AZSP for new laptop designs requiring higher efficiency and phase multiplexing - not for drop-in replacement in legacy desktop motherboards. |
Compared with HIP6521CB, ISL6522CRZ offers enhanced drive strength and tighter VCC tolerance but abandons bipolar compatibility and AGP-specific regulation, while RT8802AZSP shifts to multi-phase topology and eliminates rDS(ON) sensing - making both unsuitable as pin- or function-compatible replacements without board-level changes.
Availability
HIP6521CB is available at Aetrix Electronics and suitable for motherboard power regulation, ATX-compliant computing systems, and legacy industrial PC designs requiring stable component supply with long-lifecycle support.
Supply support for HIP6521CB 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 HIP6521CB belongs to Intersil's motherboard power controller product line, engineered specifically to consolidate four critical voltage rails - memory core, AGP, clock, and chipset core - into a single SOIC package for x86-based desktop platforms.
FAQ
What is the primary function of the HIP6521CB in a computer motherboard?
The HIP6521CB serves as an integrated quad-output power controller: it regulates the 2.5V memory core voltage via synchronous PWM, and separately controls the 1.5V AGP bus, 2.5V clock, and 1.8V North/South Bridge core using three bipolar NPN linear regulators. Its design targets ATX-compliant desktop motherboards requiring coordinated, ACPI-aware multi-rail power sequencing.
Does the HIP6521CB require an external current-sense resistor for overcurrent protection?
No. The HIP6521CB implements rDS(ON)-based overcurrent protection for its PWM channel using the OCSET pin and internal 40 µA current sink. A single external resistor (ROCSET) sets the trip threshold by developing VSET across itself; no separate current-sense resistor or shunt is needed - reducing component count and PCB area.
How does the HIP6521CB support ACPI power management states?
The HIP6521CB supports ACPI by enabling independent shutdown of each linear regulator via its FB2, FB3, and FB4 pins: pulling any FB pin above 1.25 V disables the corresponding regulator and initiates soft-start on release. This allows OS-directed transitions between S0–S5 states without hardware sequencer intervention.
What is the recommended thermal design for the HIP6521CB in continuous operation?
For continuous operation at maximum ambient (70°C), the HIP6521CB requires a PCB layout with adequate copper pour on the PGND pad and thermal vias to an internal ground plane. With θJA = 110°C/W, junction temperature must stay ≤125°C; derate power dissipation above 50°C ambient, especially when driving multiple linear pass transistors simultaneously.
Can the HIP6521CB regulate output voltages other than the standard 2.5V, 1.5V, 2.5V, and 1.8V rails?
Yes. All four outputs are resistor-adjustable: the PWM output (VOUT1) can be set between VIN and 0.8 V using a feedback divider; linear outputs (VOUT2–VOUT4) are similarly programmed via external resistive dividers tied to FB2–FB4, with the constraint that parallel resistance stays below 5 kΩ to maintain regulation accuracy and drive capability.
HIP6521CB 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
HIP6521CB FAQ
1.How can I place an order for HIP6521CB through Aetrix?
Please submit a Request for Quotation (RFQ) for HIP6521CB 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 HIP6521CB reliable?
The price and inventory of HIP6521CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HIP6521CB is usually 5 days.
3.What payment methods are accepted for HIP6521CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HIP6521CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HIP6521CB?
HIP6521CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HIP6521CB 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 HIP6521CB?
For technical support, including HIP6521CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HIP6521CB requirements.
6.How does Aetrix verify that HIP6521CB is sourced from the original manufacturer or authorized distributors?
All HIP6521CB 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 HIP6521CB meets industry standards.
7.What is the process for return or replacement of HIP6521CB?
All HIP6521CB units undergo pre-shipment inspection (PSI). If there is an issue with HIP6521CB, 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 HIP6521CB part is unused and in its original packaging.
Return procedure for HIP6521CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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