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Renesas ISL9441IRZ
- Part No.:
- ISL9441IRZ
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL9441IRZ.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,893
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Product details
Overview
ISL9441IRZ from Renesas (formerly Intersil) is a quad-output power management IC integrating three synchronous buck PWM controllers and one low-dropout linear regulator controller. It delivers 0.8V–5V programmable outputs, operates at 300kHz fixed switching frequency, supports 5.6V–24V input, and implements 180° out-of-phase PWM switching to reduce RMS input ripple-designed for multi-rail power in cable modems and VoIP gateways.
For engineers reviewing the ISL9441IRZ datasheet, ISL9441IRZ pinout, ISL9441IRZ application, or ISL9441IRZ equivalent, key selection criteria include its absence of early warning function (vs. ISL9440/ISL9440A), triple out-of-phase PWM architecture with integrated bootstrap diodes, internal loop compensation, and 32-pin 5×5mm QFN package with independent enable/control per rail.
Technical Context
The ISL9441IRZ employs current-mode control with voltage feed-forward for robust line regulation and simplified loop stability. Its three PWM channels operate with 0°/180°/0° phase alignment-Channel 1 and Channel 2 are synchronized 180° out-of-phase while Channel 3 aligns with Channel 1-reducing input capacitor RMS current by up to 40% versus in-phase operation.
All PWMs use adaptive shoot-through protection with real-time gate waveform monitoring and 20ns minimum dead time. The LDO controller drives external PNP or PFET for ultra-low dropout regulation, and the internal 5V LDO (VCC_5V) supplies bias, gate drivers, and boot circuitry with 60mA output capability and 600mV typical dropout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.6V–24V (VIN pin); enables direct compatibility with 12V/24V industrial and broadband power rails |
| Switching Frequency | 300kHz ±13% (fixed); balances efficiency, EMI, and component size for mid-power applications |
| Output Voltage Range | 0.8V–5V (programmable per channel via FB resistive divider); supports core, I/O, and auxiliary rails |
| Max Duty Cycle | 93%; allows ≥12V input to regulate 5V output with margin, supporting wide VIN-to-VOUT ratios |
| Thermal Range | −40°C to +85°C operating; validated for set-top box and gateway environments with passive cooling |
| Protection Features | Overcurrent (via ISEN rDS(ON) sensing), overvoltage (118%), undervoltage lockout, overtemperature (150°C shutdown) |
| Soft-Start Time | 1.7ms typical; ensures controlled ramp-up across all four outputs without sequencing conflicts |
Pinout & Package
ISL9441IRZ is housed in a thermally enhanced 32-lead 5mm × 5mm QFN package (Pb-free, RoHS compliant) with exposed thermal pad. Pin 1 is located at top-left corner (marked dot), and SGND (Pin 11) and PGND (Pin 23) must be connected to separate ground planes or joined only at a single point near the IC for noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHASE1–3 | Switch node connection | Drives high-side MOSFET source / low-side MOSFET drain junction; requires low-inductance layout to minimize ringing |
| UGATE1–3 / LGATE1–3 | High-/low-side gate drive outputs | Deliver 800mA/2A (Ch1–2) or 400mA/400mA (Ch3) sink/source; support IRF7907/IRF7404 FETs directly |
| BOOT1–3 | Bootstrap supply input | Integrated bootstrap diodes eliminate external diodes; boot caps connect PHASE→BOOT for high-side gate bias |
| FB1–3 / LDOFB | Voltage feedback inputs | Monitor regulated output via resistor dividers; set VOUT = 0.8V × (1 + R1/R2); referenced to 0.8V precision internal bandgap |
| ISEN1–3 | Current sense inputs | Measure lower MOSFET rDS(ON) voltage drop for cycle-by-cycle OCP-no external sense resistor required |
| EN1–3 | Independent enable inputs | Logic-high (>2.0V) enables corresponding PWM; floating or pulled high defaults to active-enables flexible rail sequencing |
| PGOOD | Open-drain status output | Pulled low if any PWM output deviates >10% or LDO output drops <75%; monitors VIN only in ISL9440/A-not ISL9441IRZ |
| VIN / VCC_5V | Main supply / internal LDO output | VIN powers IC at 5.6–24V; VCC_5V provides 5V/60mA bias-must be decoupled with ≥4.7µF ceramic cap adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Triple out-of-phase PWM control | Reduces input RMS current by ~30% vs. in-phase operation-lowers input capacitor count, cost, and EMI filter complexity |
| No external current sense resistor | Uses lower MOSFET rDS(ON) for OCP-eliminates 2–3 components per channel and associated PCB area and tolerance drift |
| Internal loop compensation | Enables stable operation with minimal external components-reduces BOM count and design validation effort for compact layouts |
| Adaptive shoot-through protection | Dynamically adjusts dead time based on actual gate waveforms-prevents cross-conduction across MOSFET types and temperatures |
| Independent enable/shutdown per rail | Supports precise power-up/down sequencing without external logic-critical for FPGA, SoC, and multi-voltage ASIC applications |
Applications
| Cable Modem Power Supply | Voice over IP Gateway |
|---|---|
Use Scenario: Powers multiple voltage rails (e.g., 1.5V CPU core, 2.5V memory, 5V PHY, 3.3V LDO) from a 12V DC input in space-constrained residential broadband hardware. IC Role / Device Role / Timing Role: Quad-output PMIC providing synchronized, sequenced, and protected DC-DC conversion with no external current sense or compensation parts. Use Value: Reduces total solution size by 25% versus discrete controllers; 180° out-of-phase switching cuts input capacitance requirement by ≥40%. |
Use Scenario: Delivers tightly regulated, low-noise power to VoIP processor, Ethernet PHY, and analog codec subsystems in carrier-class gateways. IC Role / Device Role / Timing Role: Centralized power controller managing rail sequencing, fault reporting (PGOOD/RST), and thermal safety across four independent domains. Use Value: Eliminates need for external reset supervisor and sequencing IC-simplifies BOM and improves startup reliability under brownout conditions. |
| Satellite Set-Top Box | Network-Attached Storage |
Use Scenario: Supplies 1.2V SoC core, 1.8V DDR interface, 3.3V tuner, and 5V USB ports from a 12V wall adapter in thermally limited plastic enclosures. IC Role / Device Role / Timing Role: Multi-phase buck controller with integrated LDO delivering stable, low-ripple power with automatic overtemperature shutdown. Use Value: Internal 5V LDO powers gate drivers and boot circuits-removes need for auxiliary 5V rail and associated regulators. |
Use Scenario: Powers dual-core ARM processor, SATA controller, DDR3 memory, and 3.3V fan controller in compact NAS enclosures with passive cooling. IC Role / Device Role / Timing Role: Single-chip quad-regulator enabling independent enable/disable of storage, compute, and interface rails during sleep/wake transitions. Use Value: Independent EN pins allow dynamic rail gating-reducing standby power by >60% compared to always-on solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL9440IRZ | Includes early warning function on VIN pin; same 300kHz frequency and pinout | Triggers PGOOD/RST when VIN falls below 5.55V-required for systems needing input brownout detection | Select ISL9440IRZ only if early warning functionality is needed; ISL9441IRZ avoids false PGOOD asserts in 5V-derived VIN configurations |
| MP8859GQ-Z | Quad-output buck controller with 500kHz switching, no integrated LDO, different pinout and enable logic | Lacks linear regulator channel and out-of-phase timing control-requires external LDO and additional sequencing logic | Choose MP8859GQ-Z for higher-frequency designs where LDO integration is unnecessary and board space permits extra components |
Compared with ISL9440IRZ, ISL9441IRZ removes early warning to simplify PGOOD behavior in 5V-input systems; compared with MP8859GQ-Z, it integrates LDO control and out-of-phase timing-reducing external part count and improving input ripple performance without layout redesign.
Availability
ISL9441IRZ is available at Aetrix Electronics and suitable for cable modems, VoIP gateways, satellite set-top boxes, and industrial embedded systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9441IRZ 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
Renesas Electronics acquired Intersil in 2017 and maintains full technical and manufacturing continuity for the ISL944x family. Renesas is a global semiconductor leader focused on microcontrollers, analog, and power management solutions.
The ISL9441IRZ belongs to Renesas' high-integration power management IC product line, designed specifically for cost-sensitive, space-constrained broadband and communications equipment requiring multi-rail sequencing, low EMI, and robust protection.
FAQ
What is the key functional difference between ISL9441IRZ and ISL9440IRZ?
The ISL9441IRZ omits the early warning function present in ISL9440IRZ. While both share identical 300kHz switching frequency, pinout, and out-of-phase PWM architecture, ISL9440IRZ monitors VIN for brownout and pulls PGOOD/RST low when VIN drops below ~5.55V. ISL9441IRZ does not monitor VIN-its PGOOD reflects only output voltage regulation status, making it safer for 5V-derived input applications where early warning would cause spurious faults.
Does ISL9441IRZ require external current sense resistors for overcurrent protection?
No, ISL9441IRZ does not require external current sense resistors. It uses the rDS(ON) of the lower MOSFETs for current-loop feedback and overcurrent protection via ISEN1–3 pins. This eliminates two to three resistors per channel, reduces BOM cost, avoids resistor tolerance errors, and simplifies layout-confirmed in the datasheet's "No external current sense resistor" feature list and Electrical Specifications table.
Can ISL9441IRZ operate with a 5V input supply?
Yes, ISL9441IRZ supports 5V ±10% input operation. In this configuration, the VIN pin must be tied directly to the VCC_5V pin, bypassing the internal LDO. The device then draws bias from the external 5V supply. Unlike ISL9440/ISL9440A, ISL9441IRZ has no early warning on VIN-so PGOOD remains stable during 5V operation, avoiding false fault assertions that occur with the other variants.
What is the purpose of the G4 pin on ISL9441IRZ?
The G4 pin on ISL9441IRZ is the open-drain output of the integrated linear regulator controller. It drives the base/gate of an external PNP transistor or PFET to implement an ultra-low-dropout LDO stage. Unlike the PWM outputs, G4 is not a voltage regulator itself-it provides controlled current sinking (50mA max) to regulate a fourth output rail (e.g., 3.3V @ 500mA) using external pass devices and feedback via LDOFB.
How does ISL9441IRZ achieve reduced input ripple compared to standard triple-buck controllers?
ISL9441IRZ reduces input ripple by operating its three PWM channels with 0°/180°/0° phase alignment-Channel 1 and Channel 2 switch 180° out-of-phase, while Channel 3 aligns with Channel 1. This staggers peak input current draw, lowering RMS input current by up to 40% versus in-phase operation. As a result, fewer or lower-ESR input capacitors are needed, reducing cost, board area, and conducted EMI-verified in the datasheet's Functional Description and Typical Application schematics.
ISL9441IRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (3), Linear (LDO) (1)
- 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:
- 4.5V ~ 24V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
ISL9441IRZ FAQ
1.How can I place an order for ISL9441IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9441IRZ 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 ISL9441IRZ reliable?
The price and inventory of ISL9441IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9441IRZ is usually 5 days.
3.What payment methods are accepted for ISL9441IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9441IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9441IRZ?
ISL9441IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9441IRZ 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 ISL9441IRZ?
For technical support, including ISL9441IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9441IRZ requirements.
6.How does Aetrix verify that ISL9441IRZ is sourced from the original manufacturer or authorized distributors?
All ISL9441IRZ 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 ISL9441IRZ meets industry standards.
7.What is the process for return or replacement of ISL9441IRZ?
All ISL9441IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL9441IRZ, 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 ISL9441IRZ part is unused and in its original packaging.
Return procedure for ISL9441IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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