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Renesas ISL6521IBZ-T
- Part No.:
- ISL6521IBZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ISL6521IBZ-T.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,078
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Product details
Overview
ISL6521IBZ-T from Intersil is a quad-output power controller integrating one voltage-mode PWM buck controller (for high-current core supplies) and three linear regulators (for I/O, memory, and auxiliary voltages) in a 16-lead SOIC package. It delivers ±2.5% output regulation over -40°C to +85°C, supports up to 20A PWM output with external MOSFETs, and provides 120mA per linear regulator or >3A with external NPN pass transistors - used in FPGA and PowerPC™-based board power systems.
For engineers reviewing the ISL6521IBZ-T datasheet, ISL6521IBZ-T pinout, ISL6521IBZ-T application, or ISL6521IBZ-T equivalent, key selection considerations include its triple-linear + synchronous-buck architecture, rDS(ON)-based overcurrent sensing, 300kHz fixed-frequency operation, 0–100% duty cycle capability, and independent soft-start and shutdown per output.
Technical Context
The ISL6521IBZ-T implements a single-loop voltage-mode PWM control architecture with a 300kHz oscillator and high-bandwidth error amplifier (15MHz GBWP, 6V/µs slew rate), enabling fast transient response for processor core rails. Its integrated protection includes cycle-by-cycle overcurrent detection via upper MOSFET rDS(ON) voltage drop and independent undervoltage monitoring on all three linear FB pins.
All four regulated outputs are resistor-adjustable using external dividers referenced to a 0.800V internal reference (±2.5% tolerance over temperature). The PWM section drives high-side and low-side MOSFET gates directly (±1A UGATE, +2A LGATE sink), while DRIVE2/3/4 pins each source up to 120mA for base drive of external NPN pass transistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PWM Frequency | 300kHz fixed frequency (250–350kHz range over -40°C to +85°C); enables compact magnetics and predictable EMI profile. |
| Reference Voltage | 0.800V ±2.5mV (typical); sets precision output voltage via external resistor divider for all four regulators. |
| Output Regulation | ±2.5% over line, load, and temperature (-40°C to +85°C); ensures stable core/I/O rail accuracy across industrial environments. |
| PWM Gate Drive | UGATE: ±1A peak; LGATE: +2A sink / -1A source; supports direct drive of logic-level MOSFETs without buffers. |
| Linear Output Current | 120mA per channel (DRIVE2/3/4); sufficient for low-power I/O/memory rails or base drive for external NPNs delivering >3A. |
| Overcurrent Sensing | rDS(ON)-based (no sense resistor required); OCSET pin sinks 40µA (typ) to set trip threshold via ROCSET resistor. |
| Soft-Start Interval | 6.83ms typical; controls ramp rate of all four outputs to limit inrush current during system power-up. |
Pinout & Package
ISL6521IBZ-T is housed in a 16-lead SOIC package (Pb-free, RoHS compliant, M16.15 drawing), with exposed pad not electrically connected. Thermal resistance θJA = 74°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRIVE2 (Pin 1) | Linear Regulator 2 Output Driver | Sources up to 120mA to base of external NPN transistor for VOUT2 (e.g., 2.5V I/O rail). |
| FB2 (Pin 2) | Linear Regulator 2 Feedback Input | Monitors VOUT2 via resistor divider; regulated to 0.8V; UV detection triggers shutdown if pulled <70% of reference. |
| FB (Pin 3) | PWM Regulator Feedback Input | Inverting input of PWM error amplifier; connects to output divider to regulate VOUT1 (e.g., 1.5V core). |
| COMP (Pin 4) | PWM Error Amplifier Output | Connects to compensation network (R/C) to stabilize voltage-mode loop; interfaces with oscillator comparator. |
| GND (Pin 5) | Signal Ground Reference | Reference node for all analog circuitry and feedback measurements; separate from PGND to avoid noise coupling. |
| PHASE (Pin 6) | Synchronous Buck Switch Node | Connects to source of upper MOSFET; used with OCSET to measure rDS(ON) voltage for overcurrent protection. |
| BOOT (Pin 7) | High-Side Gate Drive Bootstrap | Supplies floating bias for UGATE; requires 0.47µF capacitor to PHASE for proper high-side MOSFET turn-on. |
| UGATE (Pin 8) | Upper MOSFET Gate Driver | Drives gate of high-side N-channel MOSFET in synchronous buck; ±1A drive capability supports fast switching. |
| PGND (Pin 9) | Power Ground Return | Return path for high-current PWM switch node; must be tied to source of lower MOSFET and kept separate from signal GND. |
| LGATE (Pin 10) | Lower MOSFET Gate Driver | Drives gate of synchronous rectifier (low-side N-MOSFET); +2A sink capability enables strong turn-off. |
| VCC (Pin 11) | Bias Supply Input | +5V ±10% input powering IC core, gate drivers, and linear regulators; monitored for POR (4.25–4.51V rising threshold). |
| OCSET (Pin 12) | Overcurrent Set Input | 40µA (typ) current sink; voltage developed across ROCSET sets PWM overcurrent trip point based on rDS(ON). |
| DRIVE3 (Pin 13) | Linear Regulator 3 Output Driver | Sources up to 120mA for VOUT3 (e.g., 1.8V memory rail); compatible with bipolar NPN pass devices. |
| FB3 (Pin 14) | Linear Regulator 3 Feedback Input | Regulates VOUT3 to 0.8V; UV detection initiates independent shutdown and soft-start retry on fault. |
| DRIVE4 (Pin 15) | Linear Regulator 4 Output Driver | Sources up to 120mA for VOUT4 (e.g., 3.3V auxiliary rail); supports independent enable/disable via FB4 pull-up. |
| FB4 (Pin 16) | Linear Regulator 4 Feedback Input | Feedback node for fourth linear output; pulling >1.25V disables regulator and triggers soft-start on release. |
Key Features
| Feature | Design Value |
|---|---|
| Four independent regulated outputs | One high-current PWM buck (core) + three linear (I/O, memory, aux) - eliminates need for multiple discrete controllers. |
| rDS(ON)-based overcurrent protection | Removes external current-sense resistor and associated power loss, PCB area, and layout sensitivity. |
| Independent soft-start and shutdown per output | Enables sequenced power-up/down for FPGA/ASIC supply domains and prevents bus contention or latch-up. |
| 0% to 100% duty cycle capability | Supports wide VIN-to-VOUT ratios including very low output voltages (e.g., 1.5V from 5V input) without diode conduction loss. |
| Integrated 0.8V reference with ±2.5% tolerance | Ensures consistent output accuracy across all four rails without trimming or calibration components. |
Applications
| FPGA Core & I/O Power | PowerPC™ System Board |
|---|---|
Use Scenario: Powering Xilinx/Altera/Actel FPGA boards requiring tightly regulated 1.5V core, 2.5V I/O, 1.8V memory, and 3.3V auxiliary rails. IC Role / Device Role / Timing Role: ISL6521IBZ-T acts as primary multi-rail power controller - PWM regulates core voltage; linear regulators condition I/O, memory, and clock supply domains. Use Value: Single-chip solution reduces BOM count, simplifies layout, and guarantees synchronized soft-start across all rails per FPGA vendor guidelines. | Use Scenario: Generating four stable DC rails on PowerPC™-based industrial control or communications modules operating from -40°C to +85°C. IC Role / Device Role / Timing Role: ISL6521IBZ-T serves as system power manager - PWM handles high-current CPU core; linear regulators deliver low-noise, low-ripple I/O and memory supplies. Use Value: ±2.5% regulation over full industrial temperature range ensures reliable boot and sustained operation under thermal stress. |
| Triple Linear + High-Current Buck | Sequenced Multi-Rail Supply |
Use Scenario: Compact embedded systems needing one high-current buck (up to 20A) plus three auxiliary linear supplies without external pass transistors. IC Role / Device Role / Timing Role: ISL6521IBZ-T integrates switching and linear regulation - PWM section drives external MOSFETs; linear sections source 120mA directly for low-power rails. Use Value: Eliminates three discrete LDOs and associated support components, reducing footprint and improving efficiency vs. all-LDO solutions. | Use Scenario: Systems requiring strict power-up sequencing (e.g., core before I/O) and independent fault recovery for each rail. IC Role / Device Role / Timing Role: ISL6521IBZ-T provides per-rail soft-start timing and individual UV/OCP shutdown - FBx pin control enables programmable enable order. Use Value: Independent restart attempts after fault (3-cycle delay then retry) prevent system lockup and support robust field operation. |
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 |
|---|---|---|---|
| ISL6522IBZ-T | Same pinout and architecture, but adds PWM sync input (SYNC pin) and enhanced thermal shutdown; identical 16-SOIC package. | Required when system-level clock synchronization of multiple ISL652x controllers is needed; otherwise functionally interchangeable. | Select ISL6522IBZ-T only if SYNC functionality is required; ISL6521IBZ-T remains optimal for standalone, non-synchronized designs. |
| TPS51116PWR | Dual PWM + dual linear (not triple linear); different pinout; no rDS(ON) OCP; uses external sense resistor; 24-QFN package. | Targeted at DDR memory power (VDDQ/VTT), not general-purpose quad-rail FPGA boards; lacks independent linear FB monitoring. | Not a drop-in replacement; consider only if redesigning for QFN layout and accepting reduced linear channel count and added sensing components. |
Compared with ISL6522IBZ-T, the ISL6521IBZ-T offers identical quad-rail control without sync capability - simplifying design where timing coordination is unnecessary. Against TPS51116PWR, ISL6521IBZ-T provides superior integration (3 linear rails, rDS(ON) sensing, SOIC compatibility) for FPGA power applications requiring four independent, sequenced supplies.
Availability
ISL6521IBZ-T is available at Aetrix Electronics and suitable for FPGA-based boards, PowerPC™ system designs, and industrial embedded power supplies requiring stable component supply across extended temperature ranges.
Supply support for ISL6521IBZ-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 (now part of Renesas Electronics) is a semiconductor company specializing in high-performance analog and power management ICs for computing, industrial, and communications markets.
The ISL6521 product line was designed specifically for multi-rail, low-voltage power delivery in programmable logic and embedded processor systems - emphasizing integration, thermal robustness, and simplified sequencing.
FAQ
What is the operating temperature range for the ISL6521IBZ-T?
The ISL6521IBZ-T is rated for an industrial temperature range of -40°C to +85°C at the ambient case level. Its junction temperature may reach up to 125°C under normal operation, and the maximum allowable junction temperature is 150°C. This rating is confirmed in the Absolute Maximum Ratings table and Operating Conditions section of the FN9148 datasheet.
Does the ISL6521IBZ-T require an external current-sense resistor for overcurrent protection?
No, the ISL6521IBZ-T does not require an external current-sense resistor. It implements rDS(ON)-based overcurrent detection by measuring the voltage drop across the upper MOSFET's on-resistance using the PHASE and OCSET pins. An external ROCSET resistor sets the trip threshold in conjunction with the internal 40µA current sink.
Can the ISL6521IBZ-T regulate four different output voltages simultaneously?
Yes, the ISL6521IBZ-T regulates four independent output voltages simultaneously: one via its synchronous PWM buck controller (e.g., 1.5V core) and three via dedicated linear regulator channels (e.g., 2.5V I/O, 1.8V memory, 3.3V auxiliary). Each output is resistor-adjustable using external feedback dividers referenced to the 0.800V internal bandgap.
What is the maximum output current capability of the linear regulators in the ISL6521IBZ-T?
Each linear regulator in the ISL6521IBZ-T can deliver up to 120mA directly from its DRIVE2/3/4 pins. When used with external bipolar NPN pass transistors (e.g., Q3 in Figure 3 of the datasheet), the linear outputs can support >3A, limited only by thermal design and external device selection - as explicitly stated in the Features and Typical Applications sections.
Is the ISL6521IBZ-T pin-compatible with the ISL6521CBZ-T?
Yes, the ISL6521IBZ-T is pin-compatible with the ISL6521CBZ-T. Both use the same 16-lead SOIC package (M16.15) and identical pinout. The only difference is the operating temperature range: ISL6521IBZ-T supports -40°C to +85°C, while ISL6521CBZ-T is rated for 0°C to +70°C. Electrical specifications (e.g., oscillator frequency range, regulation tolerance) are adjusted accordingly per grade.
ISL6521IBZ-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:
- Adjustable, 120mA
- Voltage/Current - Output 3:
- Adjustable, 120mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ISL6521IBZ-T FAQ
1.How can I place an order for ISL6521IBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6521IBZ-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 ISL6521IBZ-T reliable?
The price and inventory of ISL6521IBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6521IBZ-T is usually 5 days.
3.What payment methods are accepted for ISL6521IBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6521IBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6521IBZ-T?
ISL6521IBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6521IBZ-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 ISL6521IBZ-T?
For technical support, including ISL6521IBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6521IBZ-T requirements.
6.How does Aetrix verify that ISL6521IBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6521IBZ-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 ISL6521IBZ-T meets industry standards.
7.What is the process for return or replacement of ISL6521IBZ-T?
All ISL6521IBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6521IBZ-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 ISL6521IBZ-T part is unused and in its original packaging.
Return procedure for ISL6521IBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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