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Renesas ISL9441IRZ-T
- Part No.:
- ISL9441IRZ-T
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL9441IRZ-T.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,127
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Product details
Overview
ISL9441IRZ-T from Renesas Electronics (formerly Intersil) is a quad-output power management IC integrating three synchronous buck PWM controllers and one LDO linear controller for multi-rail DC/DC conversion. It delivers 300kHz fixed-frequency operation, 0.8V–5V programmable outputs, out-of-phase (0°/180°/0°) switching to reduce input ripple, and full protection suite including OCP, OVP, UVP, and OTP - deployed in satellite set-top boxes and cable modems.
For engineers reviewing the ISL9441IRZ-T datasheet, ISL9441IRZ-T pinout, ISL9441IRZ-T application, or ISL9441IRZ-T equivalent, key selection considerations include its absence of early warning functionality (vs. ISL9440/ISL9440A), 32-pin 5×5mm QFN package, independent enable inputs for rail sequencing, no external current sense resistor (rDS(ON)-based sensing), and internal loop compensation enabling compact, low-BOM-count designs.
Technical Context
The ISL9441IRZ-T implements current-mode control with voltage feed-forward for robust line regulation and simplified loop stability across wide input ranges (5.6V–24V or 4.5V–5.6V when VIN tied to VCC_5V). Its triple PWM channels operate at precisely synchronized 300kHz with 0°/180°/0° phase alignment to minimize RMS input current and input capacitor stress.
Each buck channel uses adaptive dead-time control and integrated bootstrap diodes; overcurrent protection is implemented via ISEN pins monitoring lower MOSFET rDS(ON), eliminating external sense resistors. The fourth output is a programmable LDO controller (G4 pin) supporting PNP or PFET configurations for ultra-low-dropout regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Triple synchronous buck + single LDO linear controller - enables 4 independent regulated rails from single input. |
| Switching Frequency | 300kHz fixed - balances efficiency, size, and EMI; distinct from ISL9440A's 600kHz. |
| Input Voltage Range | 5.6V–24V (VIN-powered) or 4.5V–5.6V (VCC_5V-powered) - supports wide industrial and broadband power inputs. |
| Output Voltage Range | 0.8V to ≥5V (programmable per channel via FB divider) - covers core logic, memory, and interface rails. |
| Phase Alignment | 0°/180°/0° out-of-phase switching - reduces input ripple current by ~30% vs. in-phase, lowering required input capacitance. |
| Protection Features | OCP (rDS(ON)-based), OVP (118% nominal), UVP (VIN lockout at 4.2V), OTP (150°C shutdown) - comprehensive fault coverage without external circuitry. |
| Package | 32-lead 5mm × 5mm QFN (L32.5x5B) - thermally enhanced, RoHS-compliant, surface-mount compatible with standard reflow profiles. |
Pinout & Package
ISL9441IRZ-T is housed in a 32-lead, 5mm × 5mm QFN package with exposed thermal pad (PKG DWG # L32.5x5B). Pin 1 is located at top-left corner (marked dot); SGND (Pin 11) and PGND (Pin 23) require separate low-impedance ground routing per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1, EN2, EN3 (Pins 5, 14, 17) | Independent enable inputs | Enable/disable each buck regulator individually - enables precise power-up/down sequencing without external logic. |
| FB1, FB2, FB3, LDOFB (Pins 6, 13, 16, 10) | Voltage feedback inputs | Set output voltage via resistor divider; also feed PGOOD monitoring - eliminates need for external error amplifiers. |
| ISEN1, ISEN2, ISEN3 (Pins 1, 24, 18) | Current-sense inputs | Monitor lower MOSFET rDS(ON) voltage drop - provides cycle-by-cycle OCP without lossy external shunt resistor. |
| UGATE1–3 / LGATE1–3 (Pins 30/29, 27/28, 21/22) | High- and low-side gate drivers | Drive N-channel upper/lower FETs; Channel 1/2 support 800mA source / 2A sink; Channel 3: 400mA source/sink - matches typical SO-8 dual FETs. |
| BOOT1–3 (Pins 31, 26, 20) | Bootstrap supply terminals | Internally integrate bootstrap diodes - simplifies layout and reduces BOM count versus discrete bootstrap solutions. |
| PGOOD (Pin 2) | Open-drain status output | Asserts LOW if any PWM output deviates >10% or LDO output <75% - provides system-level power-good signaling without external comparators. |
| RST (Pin 8) | Reset pulse output | Drives LOW 5.5µs after PGOOD falls - directly interfaces with microcontroller reset inputs for fail-safe recovery. |
| VIN (Pin 4) | Main power input | Accepts 5.6V–24V; ISL9441IRZ-T does not monitor VIN for early warning - unlike ISL9440/ISL9440A, PGOOD remains unaffected by VIN dips. |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistor | Uses lower MOSFET rDS(ON) for OCP - eliminates power loss, board space, and cost of precision shunt resistors. |
| Internal loop compensation | Reduces external components to only feedback dividers and output caps - accelerates design, improves reliability, lowers total solution cost. |
| Out-of-phase (0°/180°/0°) PWM switching | Lowers RMS input ripple current by ~30% - permits smaller, cheaper input capacitors and eases EMI filtering requirements. |
| Independent enable inputs (EN1–EN3) | Enables flexible rail sequencing (e.g., VDDIO before VDDCORE) - avoids external sequencer ICs or complex FPGA-controlled GPIO timing. |
| Integrated 5V LDO (VCC_5V) | Supplies IC bias, gate drivers, and boot circuits - eliminates need for external 5V rail; requires only 4.7µF ceramic decoupling. |
| Adaptive shoot-through protection | Dynamically adjusts dead time based on real gate waveforms - prevents cross-conduction across wide FET types and operating conditions. |
Applications
| Satellite Set-Top Box Power | Cable Modem Multi-Rail Supply |
|---|---|
|
Use Scenario: Powers SoC core (1.2V), memory interface (1.5V), tuner (3.3V), and USB PHY (5V) from 12V input in compact consumer enclosure. IC Role / Device Role / Timing Role: Quad-output PMIC providing tightly regulated, sequenced, and protected rails - replaces four discrete controllers and reduces PCB area by >40%. Use Value: Out-of-phase switching cuts input ripple current, allowing use of two 22µF X7R ceramics instead of four - saving 12mm² board space and $0.18/BOM. |
Use Scenario: Delivers 2.5V@6A (PHY), 1.5V@6A (CPU), 5V@2A (USB), and [email protected] (LDO) from 12V input in DOCSIS 3.1 modem. IC Role / Device Role / Timing Role: Centralized power controller managing dynamic load transients across multiple subsystems - synchronizes response via shared current-mode architecture. Use Value: Internal rDS(ON) current sensing eliminates 0.5W shunt losses at full load - improves thermal margin and enables fanless operation. |
| VoIP Gateway DC/DC Conversion | Industrial Network Attached Storage (NAS) |
|
Use Scenario: Generates isolated 3.3V, 1.8V, and 1.2V rails for DSP, Ethernet PHY, and flash memory in temperature-stressed VoIP gateway. IC Role / Device Role / Timing Role: Triple-buck + LDO controller with -40°C to +85°C operation and 150°C thermal shutdown - ensures uptime in unventilated enclosures. Use Value: Independent EN pins allow staggered startup to limit inrush; PGOOD/RST signals coordinate firmware initialization - prevents brownout-induced crashes. |
Use Scenario: Supplies 1.0V CPU core, 1.2V DDR3, 3.3V SATA, and 5V HDD rails in multi-bay NAS unit with high ambient temperature. IC Role / Device Role / Timing Role: High-efficiency quad-regulator supporting burst-mode loads from disk spin-up and network traffic surges. Use Value: 300kHz switching frequency optimizes efficiency at medium loads (2–5A) - achieves >88% peak efficiency on 1.2V/6A rail, reducing heatsink requirements. |
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-T | Includes early warning function on VIN pin; identical 300kHz frequency and pinout. | Triggers PGOOD/RST on VIN dip below 5.55V - unsuitable where VIN may sag during transient loads without system fault. | Select ISL9440IRZ-T only if early warning is required; ISL9441IRZ-T avoids false resets in 5V-derived or noisy input systems. |
| MP8765GL-Z | Triple 500kHz buck + LDO; no out-of-phase control; requires external current sense resistors. | Lacks 0°/180°/0° phase alignment - higher input ripple demands larger input capacitance and stricter EMI filtering. | Choose MP8765GL-Z for higher switching frequency needs; prefer ISL9441IRZ-T when input capacitance minimization or rDS(ON) sensing is critical. |
Compared with ISL9440IRZ-T, ISL9441IRZ-T removes early warning to prevent spurious resets under marginal input conditions, while retaining identical regulation accuracy, protection, and layout compatibility. Against MP8765GL-Z, ISL9441IRZ-T delivers superior input ripple reduction and eliminates sense-resistor losses - critical for thermally constrained broadband equipment.
Availability
ISL9441IRZ-T is available at Aetrix Electronics and suitable for satellite set-top boxes, cable modems, and VoIP gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL9441IRZ-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
Renesas Electronics acquired Intersil in 2017 and maintains full technical and manufacturing continuity for the ISL944x family. Renesas is a global leader in microcontrollers, analog, and power management ICs.
The ISL9441IRZ-T belongs to Renesas' high-integration power management IC product line, designed specifically for multi-rail, space-constrained broadband and connectivity equipment requiring minimal external components and robust protection.
FAQ
What is the switching frequency of the ISL9441IRZ-T?
The ISL9441IRZ-T operates at a fixed 300kHz switching frequency across all three PWM channels. This frequency is factory-trimmed and not user-adjustable. It differs from the ISL9440A (600kHz) and is optimized for balance between efficiency, magnetic component size, and EMI performance in broadband equipment applications.
Does the ISL9441IRZ-T support early warning functionality?
No, the ISL9441IRZ-T does not implement early warning functionality. Unlike the ISL9440IRZ-T and ISL9440AIRZ-T, it does not monitor the VIN pin voltage for pre-failure warnings. Therefore, PGOOD remains asserted during VIN sags unless output regulation is lost - making ISL9441IRZ-T more robust in systems with noisy or dynamically loaded 12V inputs.
How does overcurrent protection work on the ISL9441IRZ-T?
The ISL9441IRZ-T implements rDS(ON)-based overcurrent protection using the ISEN1–ISEN3 pins to measure voltage drop across the lower MOSFET's on-resistance. No external current sense resistor is required. Threshold is set via OCSET1–OCSET3 resistors to ground, with typical trip at 32µA into OCSET pin - translating to precise, lossless current limiting calibrated to the selected FET.
What package type and dimensions does the ISL9441IRZ-T use?
The ISL9441IRZ-T is packaged in a 32-lead, 5mm × 5mm QFN with exposed thermal pad (package drawing L32.5x5B). It has 0.5mm pitch, conforms to JEDEC MO-220 standards, and is RoHS-compliant with matte tin (e3) termination. Thermal resistance is θJA = 31°C/W in typical board layout.
Can the ISL9441IRZ-T be used with a 5V input supply?
Yes, the ISL9441IRZ-T supports 5V ±10% input operation by connecting VIN directly to VCC_5V. In this configuration, the internal 5V LDO is disabled, and the device draws bias from the external 5V rail. This mode avoids early warning conflicts and is recommended for 5V-input systems - unlike ISL9440/ISL9440A, which would falsely assert PGOOD/RST under this condition.
ISL9441IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for ISL9441IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9441IRZ-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 ISL9441IRZ-T reliable?
The price and inventory of ISL9441IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9441IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL9441IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9441IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9441IRZ-T?
ISL9441IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9441IRZ-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 ISL9441IRZ-T?
For technical support, including ISL9441IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9441IRZ-T requirements.
6.How does Aetrix verify that ISL9441IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9441IRZ-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 ISL9441IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL9441IRZ-T?
All ISL9441IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9441IRZ-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 ISL9441IRZ-T part is unused and in its original packaging.
Return procedure for ISL9441IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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