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Renesas HIP6521CB-T
- Part No.:
- HIP6521CB-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
HIP6521CB-T.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,529
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Product details
Overview
HIP6521CB-T from Intersil is a PWM and triple linear power controller IC designed for motherboard-level multi-rail voltage regulation in high-performance microprocessor systems. It integrates one synchronous-rectified 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 regulation over line/load/temperature, 300kHz fixed-frequency operation, and resistor-adjustable outputs in a 16-lead SOIC package.
For engineers reviewing the HIP6521CB-T datasheet, HIP6521CB-T pinout, HIP6521CB-T application, or HIP6521CB-T equivalent, key selection considerations include its four-output architecture, rDS(ON)-based overcurrent sensing for the PWM channel, FB-pin undervoltage monitoring for linear regulators, ACPI-compatible independent shutdown capability, and compatibility with external bipolar pass transistors - critical for legacy PC power delivery designs requiring precise sequencing and thermal-safe linear regulation.
Technical Context
The HIP6521CB-T implements voltage-mode PWM control with a 300kHz oscillator, full 0–100% duty cycle range, and a high-bandwidth error amplifier (15MHz GBWP, 6V/µs slew rate). Its PWM section uses UGATE/LGATE drivers (±1A/±2A sink-source) and monitors overcurrent via OCSET current source (40µA typ.) and PHASE node voltage drop across the upper MOSFET's rDS(ON).
All three linear controllers employ dedicated DRIVEx pins (100–120mA drive) and FBx inputs referenced to a stable 0.8V internal reference, enabling independent soft-start, undervoltage fault detection, and ACPI-compliant shutdown by pulling FBx >1.25V. The IC operates from a single +5V ±10% VCC supply and supports thermal-safe operation up to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | +5V ±10% - powers internal logic, gate drivers, and base current for external bipolar pass transistors |
| PWM Oscillator Frequency | 300kHz (275–325kHz range) - enables compact magnetics and predictable EMI profile in ATX motherboard designs |
| Reference Voltage | 0.800V (±0%) - common feedback reference for all four regulated outputs, enabling consistent resistor-divider programming |
| Output Regulation Accuracy | ±2% over line, load, and temperature - ensures stable core/bus voltages under dynamic CPU/GPU load transitions |
| OCSET Current Source | 40µA (34–46µA) - sets PWM overcurrent trip threshold in conjunction with external ROCSET and MOSFET rDS(ON) |
| Linear Drive Current | 120mA max per DRIVE pin - sufficient to saturate external NPN pass transistors (Q3/Q4/Q5) under worst-case VBE and β conditions |
| Soft-Start Interval | 6.83ms typical - controls ramp rate of all four outputs to limit inrush current during system power-up |
Pinout & Package
Package: 16-lead SOIC (M16.15), RoHS-compliant Pb-free plus anneal option available. Thermal resistance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| UGATE (8) | PWM upper gate driver output | Delivers ±1A peak current to drive gate of high-side N-channel MOSFET in synchronous buck stage |
| LGATE (10) | PWM lower gate driver output | Delivers ±2A sink current to drive gate of low-side N-channel MOSFET or Schottky sync rectifier |
| PHASE (6) | Switch node sense input | Monitors voltage drop across upper MOSFET for rDS(ON)-based overcurrent protection |
| OCSET (12) | Overcurrent threshold set input | Accepts external ROCSET resistor; 40µA current source develops VSET to trigger OCC when VDS(ON) > VSET |
| FB / COMP (3, 4) | PWM feedback and compensation nodes | FB = inverting EA input (0.8V reference); COMP = EA output - used to close voltage-mode control loop with external RC network |
| DRIVE2 / FB2 (1, 2) | AGP 1.5V linear regulator interface | DRIVE2 supplies base current to Q2; FB2 senses output via divider and triggers UV shutdown if <0.8V × 70% |
| DRIVE3 / FB3 (15, 16) | North/South Bridge 1.8V linear regulator interface | DRIVE3 drives Q3 base; FB3 enables independent soft-start and ACPI shutdown via >1.25V pull-up |
| DRIVE4 / FB4 (13, 14) | Clock 2.5V linear regulator interface | DRIVE4 drives Q4 base; FB4 provides undervoltage monitoring and controlled restart after fault |
| VCC (11) | Main bias supply input | +5V ±10% input powering all internal circuits, gate drivers, and linear base drive - also monitored for POR |
| GND (5) / PGND (9) | Signal and power ground returns | GND = analog/signal reference; PGND = high-current return path for PWM switch node and lower MOSFET source |
| BOOT (7) | Bootstrap capacitor connection | Connects to 0.47µF capacitor between BOOT and PHASE to generate floating gate drive for upper MOSFET |
Key Features
| Feature | Design Value |
|---|---|
| Four independent regulated outputs | Enables single-chip solution for memory core (2.5V PWM), AGP bus (1.5V linear), clock (2.5V linear), and chipset core (1.8V linear) - eliminating discrete controller count |
| rDS(ON)-based overcurrent protection | Eliminates need for external current-sense resistor or transformer, reducing BOM cost and PCB area in synchronous buck stage |
| ACPI-compliant linear regulator shutdown | Each linear output can be independently disabled by pulling its FB pin >1.25V, supporting S3/S4 sleep state power gating without hardware redesign |
| Resistor-adjustable output voltages | All four outputs programmed via external resistor dividers tied to FB/COMP pins - allows field tuning and platform reuse across voltage variants |
| Integrated soft-start with synchronized ramp | Single internal soft-start generator sequences all four outputs with defined timing intervals (e.g., VOUT2/VOUT4 delayed ~3 cycles after VOUT1), preventing rail collapse during boot |
Applications
| Desktop Motherboard Power | Legacy Server Board Regulation |
|---|---|
Use Scenario: Regulating 2.5V memory core, 1.5V AGP bus, 2.5V clock, and 1.8V chipset core on ATX-form-factor desktop motherboards with Pentium 4/Core 2-era processors. IC Role / Device Role / Timing Role: Primary multi-rail power controller coordinating PWM and linear regulation, providing POR-initiated soft-start and independent fault recovery. Use Value: Reduces component count vs. discrete controllers while maintaining ±2% regulation accuracy and thermal-safe linear pass transistor drive under transient loads. |
Use Scenario: Powering legacy dual-socket server boards requiring stable 1.8V ICH/MCH core and 2.5V clock rails alongside memory core regulation in industrial compute environments. IC Role / Device Role / Timing Role: Centralized voltage supervisor and regulator driver, using FBx undervoltage monitoring to detect rail faults and initiate individual soft-start retries. Use Value: Enables reliable cold-boot and warm-reset behavior without external sequencing logic, meeting IPC/JEDEC reflow and long-term reliability requirements. |
| ACPI-Compliant Sleep State Control | Thermally Constrained Linear Regulation |
Use Scenario: Implementing S3 (suspend-to-RAM) and S4 (hibernate) states in embedded PC platforms where AGP or clock rails must be powered down independently of main core voltage. IC Role / Device Role / Timing Role: ACPI power manager - accepts GPIO or southbridge signals to pull FB2/FB3/FB4 high, disabling corresponding linear regulators without affecting PWM output. Use Value: Achieves >90% standby power reduction on auxiliary rails while preserving fast wake-up latency via integrated soft-start reactivation. |
Use Scenario: Delivering 1.5V/1.8V/2.5V at ≤2A per linear channel in space-constrained board areas where DC-DC converters are impractical due to EMI or layout constraints. IC Role / Device Role / Timing Role: Bipolar linear controller - supplies base current via DRIVE pins to external NPN transistors, with thermal foldback inherent in VBE tracking. Use Value: Avoids thermal runaway risk in high-ambient environments by leveraging inherent bipolar transistor thermal characteristics, unlike MOSFET-based LDOs requiring external thermal protection. |
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 |
|---|---|---|---|
| HIP6301CBZ-T | Single PWM + dual linear controller; lacks third linear channel (no dedicated 1.5V AGP rail support); same SOIC-16 package and 0–70°C rating | Suitable only for 3-rail systems (e.g., memory core + clock + chipset), not full 4-rail ATX motherboard designs | Select HIP6301CBZ-T only when AGP 1.5V rail is omitted or supplied externally - reduces cost but sacrifices integration. |
| ISL6522CBZ-T | Enhanced successor with improved thermal performance (θJA = 95°C/W), wider VCC range (+4.75–5.25V), and added current-limit flag output; pinout differs (no OCSET pin, uses ISL6522-specific fault reporting) | Requires PCB layout change; supports newer Pentium M/Core Solo platforms with tighter voltage tolerances and higher efficiency demands | Choose ISL6522CBZ-T for new designs targeting extended thermal margin and enhanced diagnostics - not drop-in compatible with HIP6521CB-T layouts. |
Compared with HIP6521CB-T, HIP6301CBZ-T offers reduced integration for simpler 3-rail systems, while ISL6522CBZ-T delivers higher thermal robustness and diagnostic capability at the cost of non-pin-compatible layout revision - making HIP6521CB-T optimal for cost-sensitive, volume ATX motherboard production with established 4-rail requirements.
Availability
HIP6521CB-T is available at Aetrix Electronics and suitable for desktop motherboard manufacturing, legacy server board refurbishment, and industrial computing platforms requiring stable, multi-rail power delivery with ACPI compliance and bipolar linear pass transistor support.
Supply support for HIP6521CB-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 Corporation (now part of Renesas Electronics) is a semiconductor company specializing in precision analog and power management ICs for computing, industrial, and communications markets.
The HIP6521CB-T belongs to Intersil's legacy motherboard power controller product line, engineered specifically for ATX-compliant PC platforms requiring tightly sequenced, thermally safe, and ACPI-aware multi-voltage regulation using mixed PWM and bipolar linear topologies.
FAQ
What is the operating temperature range for the HIP6521CB-T?
The HIP6521CB-T is specified for an ambient temperature range of 0°C to 70°C and a junction temperature range of 0°C to 125°C. Its thermal resistance (θJA) is 110°C/W in the SOIC-16 package, meaning proper PCB copper pour and airflow are required to maintain safe operation at full load. Derating guidelines in the datasheet apply above 70°C ambient.
Does the HIP6521CB-T support pin-compatible replacement with newer Intersil controllers?
No, the HIP6521CB-T does not have a pin-compatible replacement. Intersil explicitly states "NO RECOMMENDED REPLACEMENT" in the datasheet. Successors like the ISL6522CBZ-T offer functional enhancements but feature different pin assignments (e.g., no OCSET pin) and require PCB layout changes. For new designs, Renesas recommends evaluating the ISL6522CBZ-T with full schematic and layout revision.
How does overcurrent protection work on the PWM channel of the HIP6521CB-T?
The HIP6521CB-T implements cycle-by-cycle overcurrent protection on the PWM channel using the upper MOSFET's rDS(ON) as a current-sense element. An internal 40µA current source flows through an external ROCSET resistor to develop VSET. When the voltage drop across the MOSFET (VDS(ON)) exceeds VSET, the overcurrent comparator trips, halting switching and initiating soft-start recovery. No external sense resistor is needed.
Can the linear regulators in the HIP6521CB-T be disabled independently?
Yes, each linear regulator (VOUT2, VOUT3, VOUT4) can be independently disabled by pulling its respective FB pin (FB2, FB3, FB4) above 1.25V using an open-collector/drain device or logic gate with diode coupling. This action forces shutdown and initiates a soft-start sequence upon release - a key feature enabling ACPI S3/S4 power state transitions without affecting other rails or the PWM output.
What type of external pass transistors are required for the HIP6521CB-T linear controllers?
The HIP6521CB-T linear controllers require external bipolar NPN transistors (e.g., MMBT4401, DXT7050) connected as emitter followers, driven by the DRIVE2/DRIVE3/DRIVE4 pins. The IC delivers up to 120mA base current per channel, sufficient to saturate typical small-signal NPNs at ≤2A output. MOSFETs or PNP transistors are not supported - the design assumes NPN VBE characteristics for regulation stability and thermal behavior.
HIP6521CB-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
HIP6521CB-T FAQ
1.How can I place an order for HIP6521CB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for HIP6521CB-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 HIP6521CB-T reliable?
The price and inventory of HIP6521CB-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HIP6521CB-T is usually 5 days.
3.What payment methods are accepted for HIP6521CB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HIP6521CB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HIP6521CB-T?
HIP6521CB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HIP6521CB-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 HIP6521CB-T?
For technical support, including HIP6521CB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HIP6521CB-T requirements.
6.How does Aetrix verify that HIP6521CB-T is sourced from the original manufacturer or authorized distributors?
All HIP6521CB-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 HIP6521CB-T meets industry standards.
7.What is the process for return or replacement of HIP6521CB-T?
All HIP6521CB-T units undergo pre-shipment inspection (PSI). If there is an issue with HIP6521CB-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 HIP6521CB-T part is unused and in its original packaging.
Return procedure for HIP6521CB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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