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Renesas ISL6443IRZ-T
- Part No.:
- ISL6443IRZ-T
- Manufacturer:
- Renesas
- Category:
- Power Management - Specialized
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
ISL6443IRZ-T.pdf
- Description:
- IC CTRLR PWM DUAL 300KHZ 28-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,272
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Product details
Overview
ISL6443IRZ-T from Renesas Electronics (formerly Intersil) is a triple-output DC/DC controller integrating two 300kHz synchronous buck PWM controllers operating 180° out-of-phase and one linear regulator controller. It supports input voltages from 5.6V to 24V or 4.5V to 5.6V, delivers adjustable outputs down to 0.8V, and features hiccup-mode overcurrent protection, thermal shutdown at +150°C, and a single PGOOD signal for system power sequencing. It is used in xDSL modems, FPGA/DSP power supplies, and set-top boxes.
For engineers reviewing the ISL6443IRZ-T datasheet, ISL6443IRZ-T pinout, ISL6443IRZ-T application, or ISL6443IRZ-T equivalent, key selection considerations include its dual out-of-phase PWM architecture reducing input ripple, no external current-sense resistor requirement (using rDS(ON) sensing), programmable soft-start per channel, bidirectional SYNC capability for multi-controller synchronization, and integrated 5V LDO bias supply with 60mA output capability.
Technical Context
The ISL6443IRZ-T implements current-mode control with voltage feed-forward for stable regulation across wide input ranges. Its dual PWM channels use adaptive dead-time logic and shoot-through protection, with gate drivers delivering ±400mA peak current and internal boot circuitry supporting N-channel high-side MOSFETs.
Each PWM employs an internal error amplifier (88dB DC gain, 5.9MHz GBW) and independent soft-start (5µA current source), while the linear controller drives PNP/PFET pass devices with 0.8V reference and 75% undervoltage threshold. Protection includes UVLO on VCC_5V (4.45V rising threshold), overtemperature shutdown with 20°C hysteresis, and 2-cycle latch-on overcurrent detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 300kHz ±13.3% - fixed-frequency operation enables predictable EMI filtering and simplifies output filter design. |
| Input Voltage Range | 5.6V–24V or 4.5V–5.6V - dual-range support allows flexibility between wall adapter and intermediate bus supplies. |
| Output Voltage Range | 0.8V to >VIN - each of three outputs programmable via resistive feedback dividers; minimum 0.8V reference enables core voltage regulation. |
| PGOOD Threshold Accuracy | PWM outputs: ±10% of setpoint; Linear output: 75% of setpoint - ensures reliable power-good assertion before system initialization. |
| Thermal Shutdown | +150°C with 20°C hysteresis - protects against sustained overload by disabling all controllers until junction cools to +130°C. |
| Overcurrent Detection | Uses lower MOSFET rDS(ON) - eliminates external sense resistor, reduces BOM cost and PCB area, supports hiccup-mode recovery. |
| Soft-Start Current | 5µA per channel - enables precise timing control via external capacitor; supports output voltage tracking during startup. |
Pinout & Package
ISL6443IRZ-T is housed in a RoHS-compliant, Pb-free 28-lead 5×5mm QFN package (JEDEC MO-220, package outline L28.5x5) with exposed thermal pad. The package supports high-density layouts and improved thermal performance versus TSSOP alternatives.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHASE1, PHASE2 | Power node connection point | Connects to junction of upper/lower MOSFETs and output inductor; carries high di/dt switching current - requires low-inductance layout. |
| UGATE1, UGATE2 | High-side gate driver output | Drives N-channel upper MOSFET gates using boot-strapped 5V supply; ±400mA peak drive supports fast FET switching. |
| LGATE1, LGATE2 | Low-side gate driver output | Directly drives lower MOSFET gates from VCC_5V rail; integrated shoot-through protection enforces 20ns dead time. |
| ISEN1, ISEN2 | Current sense input | Monitors voltage drop across lower MOSFET rDS(ON) for current-loop feedback and overcurrent protection - no external resistor needed. |
| FB1, FB2, FB3 | Voltage feedback inputs | Set output voltage via resistive divider; also feed PGOOD monitoring circuit - each must be within regulation for PGOOD assertion. |
| SD1, SD2 | Independent PWM enable inputs | Logic-level shutdown: HIGH = enabled, LOW = disabled; allows selective powering of PWM outputs without affecting linear regulator. |
| PGOOD | Open-drain power-good indicator | Asserts HIGH only when both PWM outputs are within ±10%, linear output >75% of setpoint, and soft-start complete - critical for system sequencing. |
| GATE3 | Linear regulator gate output | Open-drain output driving PNP emitter or PFET source; supports ultra-low dropout regulation with external pass device. |
| VCC_5V | Integrated 5V LDO output/input | Supplies IC bias, gate drivers, and boot circuitry; capable of 60mA output; must be decoupled with ≥4.7µF ceramic capacitor. |
| SYNC | Frequency synchronization input/output | Enables bidirectional synchronization of multiple ISL6443IRZ-T devices; requires 1kΩ pull-down if used, tied to VCC_5V if unused. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase PWM operation | Reduces RMS input ripple current by ~30%, enabling smaller input capacitors and lower EMI without increasing component count. |
| rDS(ON)-based current sensing | Eliminates external current-sense resistor and associated power loss, PCB area, and accuracy drift - simplifies layout and lowers BOM cost. |
| Independent per-channel soft-start | Enables controlled power-up sequencing of multiple rails (e.g., core before I/O) using different SS1/SS2 capacitor values. |
| Bidirectional SYNC capability | Allows master/slave configuration or daisy-chained synchronization of multiple ISL6443IRZ-T controllers without external clock generator. |
| Integrated 5V LDO with 60mA output | Powers internal circuitry, gate drivers, and external bootstrap components - removes need for separate bias supply in most designs. |
Applications
| xDSL Modem Power Supply | FPGA Core & I/O Power System |
|---|---|
Use Scenario: Providing isolated, sequenced 3.3V, 2.5V, and 1.2V rails from a 12V wall adapter in residential broadband equipment. IC Role / Device Role / Timing Role: ISL6443IRZ-T acts as the primary multi-rail power controller, managing buck conversion for DSP/FPGA cores and linear regulation for analog subsystems. Use Value: Dual out-of-phase PWM minimizes input capacitor stress and EMI emissions, meeting FCC Class B limits without added shielding. | Use Scenario: Delivering tightly regulated 1.2V core, 2.5V auxiliary, and 3.3V I/O supplies to Xilinx Spartan-6 FPGA in industrial control gateway. IC Role / Device Role / Timing Role: ISL6443IRZ-T provides independent soft-start and shutdown control per rail, enabling safe power-up/down sequencing required by FPGA configuration protocols. Use Value: Programmable PGOOD thresholds and per-PWM enable pins ensure correct power-state transitions, preventing configuration errors or latch-up. |
| Set-Top Box Mainboard Supply | Dual-Output Telecom System Supply |
Use Scenario: Generating 3.3V and 5V system rails plus 2.5V analog supply from 12V intermediate bus in cable TV STB with HDMI interface. IC Role / Device Role / Timing Role: ISL6443IRZ-T serves as the central power management IC, coordinating buck converters for digital logic and linear regulator for low-noise video DAC supply. Use Value: Single PGOOD signal simplifies system reset logic; thermal shutdown prevents field failures under sustained ambient temperature rise. | Use Scenario: Powering dual-voltage DSP subsystems (1.8V core, 3.3V I/O) in VoIP gateway with strict -40°C to +85°C operating range. IC Role / Device Role / Timing Role: ISL6443IRZ-T functions as a ruggedized, temperature-compensated controller with guaranteed operation across full industrial range and hiccup-mode fault recovery. Use Value: Overcurrent protection using MOSFET rDS(ON) remains accurate across temperature, avoiding false trips during cold start or hot ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6443A | Successor with improved stability, tighter reference tolerance (±0.5%), and enhanced light-load efficiency; pin-compatible but not drop-in due to changed soft-start behavior. | Preferred for new designs requiring higher accuracy or extended light-load operation; not suitable for legacy ISL6443IRZ-T firmware relying on original soft-start timing. | Select ISL6443A for new designs; verify soft-start timing and loop compensation if replacing ISL6443IRZ-T in existing hardware. |
| TPS51116PWR | TI dual PWM + LDO controller with 500kHz switching, integrated MOSFET drivers, and VR12-compatible SVID interface - lacks linear regulator output and SYNC capability. | Targets notebook CPU/GPU VRMs; unsuitable for systems requiring independent linear regulation or multi-chip synchronization. | Choose TPS51116PWR only for high-frequency, SVID-based applications where linear regulation is unnecessary and board space is constrained. |
Compared with ISL6443A and TPS51116PWR, the ISL6443IRZ-T uniquely combines out-of-phase PWM operation, rDS(ON) current sensing, and a dedicated linear regulator controller in a single 5×5mm QFN - making it optimal for cost-sensitive, multi-rail embedded systems where EMI reduction and layout simplicity are prioritized over highest efficiency or digital interface support.
Availability
ISL6443IRZ-T is available at Aetrix Electronics and suitable for xDSL modems, FPGA power supplies, set-top boxes, telecom gateways, and industrial embedded systems requiring stable component supply and long-term production continuity.
Supply support for ISL6443IRZ-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 Corporation is a global semiconductor leader formed from the merger of Renesas Technology and NEC Electronics, specializing in microcontrollers, analog, power management, and timing solutions.
The ISL6443IRZ-T belongs to Renesas' legacy Intersil power management portfolio, designed specifically for compact, multi-rail DC/DC conversion in broadband, computing, and communications infrastructure where input ripple reduction and sequencing control are critical.
FAQ
What is the recommended input voltage range for the ISL6443IRZ-T?
The ISL6443IRZ-T supports two input configurations: 5.6V to 24V when powered from VIN, or 4.5V to 5.6V when powered from the VCC_5V pin. Operation outside these ranges risks violating absolute maximum ratings - for example, VIN must not exceed +27V, and VCC_5V must stay between -0.3V and +7V. The internal 5V LDO can supply up to 60mA for gate drive and bias, but dissipation increases at higher input voltages.
How does the ISL6443IRZ-T implement overcurrent protection without an external sense resistor?
The ISL6443IRZ-T uses the lower MOSFET's rDS(ON) as the current-sense element, measuring the voltage drop across it via the ISEN1 and ISEN2 pins. This voltage is compared to a threshold set by a resistor from OCSET1/OCSET2 to ground. When overcurrent is detected for two consecutive clock cycles, the ISL6443IRZ-T enters hiccup mode - disabling gate drivers, initiating soft-start, and retrying until the fault clears.
Can the ISL6443IRZ-T synchronize with other controllers, and how is it configured?
Yes, the ISL6443IRZ-T supports bidirectional frequency synchronization via its SYNC pin. To synchronize multiple ISL6443IRZ-T devices, connect their SYNC pins together with a 1kΩ pull-down resistor to ground; one device operates as master, others as slaves. If synchronization is unused, tie the SYNC pin directly to VCC_5V. The SYNC input accepts frequencies from 4.16MHz to 5.44MHz and supports daisy-chaining without external clock sources.
What is the function of the PGOOD signal on the ISL6443IRZ-T, and when does it assert?
The PGOOD signal on the ISL6443IRZ-T is an open-drain output that asserts HIGH only when all enabled outputs meet regulation criteria: both PWM outputs within ±10% of their setpoints, the linear regulator output above 75% of its setpoint, and completion of soft-start on all active channels. Its state depends on SD1/SD2 logic levels - PGOOD remains LOW if either shutdown pin is pulled low, even if outputs are in regulation.
Is the ISL6443IRZ-T still recommended for new designs, and what is the suggested replacement?
No - the ISL6443IRZ-T is marked "NOT RECOMMENDED FOR NEW DESIGNS" in its official datasheet. Renesas recommends the ISL6443A as the direct functional successor, offering improved reference accuracy (±0.5% vs ±1.0%), enhanced stability, and better light-load efficiency. While pin-compatible, ISL6443A exhibits different soft-start behavior and requires validation in existing ISL6443IRZ-T designs before migration.
ISL6443IRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Power Supplies
- Current - Supply:
- 50µA
- Voltage - Supply:
- 5.6V ~ 24V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (5x5)
ISL6443IRZ-T FAQ
1.How can I place an order for ISL6443IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6443IRZ-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 ISL6443IRZ-T reliable?
The price and inventory of ISL6443IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6443IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL6443IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6443IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6443IRZ-T?
ISL6443IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6443IRZ-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 ISL6443IRZ-T?
For technical support, including ISL6443IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6443IRZ-T requirements.
6.How does Aetrix verify that ISL6443IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6443IRZ-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 ISL6443IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL6443IRZ-T?
All ISL6443IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6443IRZ-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 ISL6443IRZ-T part is unused and in its original packaging.
Return procedure for ISL6443IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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