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Renesas ISL6443IRZ
- Part No.:
- ISL6443IRZ
- Manufacturer:
- Renesas
- Category:
- Power Management - Specialized
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
ISL6443IRZ.pdf
- Description:
- IC CTRLR SGL/STEP DOWN PWM 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,541
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Product details
Overview
ISL6443IRZ 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, supporting adjustable outputs down to 0.8V, with integrated overcurrent, thermal, UVLO, and PGOOD monitoring for wall-adapter- or battery-powered telecom and embedded power systems.
For engineers reviewing the ISL6443IRZ datasheet, ISL6443IRZ pinout, ISL6443IRZ application, or ISL6443IRZ equivalent, key selection considerations include its dual out-of-phase PWM architecture reducing input RMS current, no external current-sense resistor requirement (using rDS(ON) sensing), programmable soft-start per channel, and 28-pin 5×5 QFN package with dedicated SGND/PGND separation.
Technical Context
The ISL6443IRZ implements current-mode control with voltage feed-forward ramp generation, enabling stable regulation across wide VIN ranges (5.6V–24V or 4.5V–5.6V). Its dual PWM channels share a fixed 300kHz switching frequency but operate 180° out-of-phase to minimize input capacitor ripple current and EMI.
Each PWM uses adaptive dead-time control and shoot-through protection, while the linear regulator (GATE3 output) supports ultra-low-dropout operation via external PNP or PFET. Overcurrent protection latches after two consecutive clock cycles and initiates hiccup-mode recovery, and thermal shutdown activates at +150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 300 kHz ±13% - sets minimum inductor size and defines EMI profile; enables use of compact ceramic input/output capacitors. |
| Output Voltage Range (PWM) | 0.8 V to VIN − Vd1 - supports core voltages for DSPs, FPGAs, and ASICs; regulated via FB1/FB2 resistive dividers. |
| Linear Regulator Threshold | 0.8 V reference with 75% PGOOD activation - ensures LDO output stability before system enable; compatible with 1.2V–3.3V I/O rails. |
| Current Sensing Method | rDS(ON)-based ISEN1/ISEN2 - eliminates external sense resistor, reduces BOM cost and PCB area, requires OCSETx resistor calibration. |
| Soft-Start Current | 5 µA - charges external SS1/SS2 capacitors to control ramp rate; enables precise sequencing between VOUT1 and VOUT2. |
| Thermal Shutdown | +150°C junction temperature - protects against sustained overload; resumes operation at +130°C after full soft-start restart. |
| Package | 28-pin 5×5 mm QFN - JEDEC MO-220-compliant near-chip-scale footprint; exposed thermal pad improves thermal dissipation in high-power designs. |
Pinout & Package
ISL6443IRZ is housed in a RoHS-compliant 28-lead 5×5 mm QFN package (Pb-free plus anneal finish) with an exposed thermal pad. Signal integrity is maintained by strict separation of small-signal ground (SGND) and power ground (PGND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1, FB2, FB3 | Voltage feedback inputs | Set PWM1/PWM2 and linear regulator output voltages via resistive dividers; referenced to 0.8V internal bandgap. |
| ISEN1, ISEN2 | Current sense inputs | Monitor lower MOSFET rDS(ON) voltage drop for current-loop control and overcurrent protection. |
| UGATE1, UGATE2 | High-side gate drivers | Drive N-channel upper MOSFETs using bootstrapped 5V supply; support 400mA peak sink/source. |
| LGATE1, LGATE2 | Low-side gate drivers | Directly drive lower MOSFET gates from VCC_5V rail; integrated shoot-through protection and adaptive dead-time. |
| GATE3 | Linear regulator output | Open-drain output controlling external PNP/PFET; regulates third output with 50mA sink capability. |
| PGOOD | Power-good status indicator | Open-drain logic output pulled low if any enabled output falls outside regulation window or soft-start incomplete. |
| SD1, SD2 | Independent PWM enable inputs | Logic-level shutdown: HIGH = enabled, LOW = disabled; allows dynamic power sequencing and fault isolation. |
| SYNC | Frequency synchronization input | Accepts 4.16–5.44 MHz external clock to synchronize multiple ISL6443IRZ devices and reduce beat-frequency EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Out-of-phase dual PWM | Reduces input RMS current by ~30% vs. in-phase operation, allowing smaller input bulk capacitance and lower EMI filter cost. |
| No external current-sense resistor | Leverages MOSFET rDS(ON) for current monitoring - eliminates 2–3 passive components per channel and associated board space. |
| Bidirectional SYNC capability | Enables master/slave configuration across multiple ISL6443IRZ units without external logic; supports scalable multi-rail power architectures. |
| Independent soft-start per PWM | 5µA SS1/SS2 current sources allow precise startup sequencing (e.g., core before I/O) via capacitor ratio matching. |
| Hiccup-mode overcurrent protection | Prevents thermal runaway during short-circuit events by cycling through soft-start until fault clears - avoids latch-off failure mode. |
Applications
| xDSL Modem Power Supply | DSP/FPGA Core + I/O Rails |
|---|---|
Use Scenario: Dual 3.3V outputs powering ADSL line driver and PHY IC, plus 1.2V linear-regulated analog front-end supply. IC Role / Device Role / Timing Role: ISL6443IRZ acts as primary triple-output controller managing independent sequencing, load transient response, and fault coordination across mixed-signal subsystems. Use Value: Out-of-phase PWM operation reduces 12V adapter input ripple by 45%, lowering required input capacitance from 470µF to 220µF ceramic. | Use Scenario: Simultaneous 1.2V/2A core and 3.3V/2A I/O supplies for FPGA-based industrial controller with real-time Ethernet interface. IC Role / Device Role / Timing Role: ISL6443IRZ provides tightly regulated, independently controllable outputs with PGOOD coordination ensuring safe power-up order. Use Value: Programmable soft-start (CSS1/CSS2 = 0.01µF/0.027µF) achieves 1.2V-to-3.3V tracking within ±2% during startup, preventing I/O latch-up. |
| Set-Top Box Main Power | Telecom Line Card Bias |
Use Scenario: Generating 3.3V, 2.5V, and 1.8V rails from 12V intermediate bus for video decoder, memory, and USB PHY in consumer STB. IC Role / Device Role / Timing Role: ISL6443IRZ serves as centralized controller with independent shutdown (SD1/SD2) enabling dynamic rail disable during standby modes. Use Value: Independent shutdown reduces quiescent current to 375µA, meeting Energy Star Level V standby requirements. | Use Scenario: Providing 5V bias for optical transceivers and 3.3V for management MCU on telecom line card with strict thermal limits. IC Role / Device Role / Timing Role: ISL6443IRZ delivers thermally robust regulation using PGND/SGND separation and thermal shutdown at +150°C. Use Value: Thermal shutdown hysteresis (20°C) prevents oscillation in enclosed chassis; exposed QFN pad maintains TJ < 125°C at 2A load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6443A | Successor with improved current-sense accuracy, tighter reference tolerance (±0.5%), and enhanced thermal performance; pin-compatible with ISL6443IRZ. | Recommended for new designs requiring higher precision or extended lifetime; supports same 5×5 QFN footprint and layout. | Select ISL6443A when designing for production beyond 2025; ISL6443IRZ remains viable for legacy repair or existing BOM continuity. |
| TPS51116PWR | TI dual PWM + LDO controller with 500kHz switching, integrated MOSFET drivers, and SMBus interface; different pinout and no SYNC capability. | Suitable for notebook-style power where telemetry and dynamic VID control are needed; not drop-in for ISL6443IRZ due to protocol and layout mismatch. | Choose TPS51116PWR only when SMBus communication and higher-frequency operation justify PCB redesign and firmware integration. |
Compared with ISL6443A, the ISL6443IRZ offers identical functionality but with looser reference tolerance and older process node; compared with TPS51116PWR, it lacks digital interface but provides simpler analog control and proven EMI behavior in telecom-grade designs.
Availability
ISL6443IRZ is available at Aetrix Electronics and suitable for xDSL modems, set-top boxes, FPGA power supplies, and telecom line cards requiring stable component supply across long-lifecycle industrial deployments.
Supply support for ISL6443IRZ 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 supply chain support for legacy Intersil power management products.
The ISL6443IRZ belongs to Intersil's high-density multi-rail controller family, designed specifically for space-constrained, multi-voltage embedded systems requiring low-noise, sequenced, and fault-resilient DC/DC conversion.
FAQ
What is the maximum input voltage supported by the ISL6443IRZ?
The ISL6443IRZ supports a maximum input voltage of +24V on the VIN pin and +27V absolute maximum rating. When powered from the VCC_5V pin, the input range is limited to 4.5V–5.6V. Operation above 24V violates recommended conditions and risks damage per Absolute Maximum Ratings. The ISL6443IRZ internal LDO dropout is ~600mV, so VCC_5V output remains stable at 5V up to VIN = 5.6V.
How does the ISL6443IRZ implement overcurrent protection without an external sense resistor?
The ISL6443IRZ senses current through the voltage drop across the lower MOSFET's rDS(ON), routed to ISEN1/ISEN2 pins. An external resistor from OCSET1/OCSET2 to ground sets the overcurrent threshold voltage (1.75V). This method eliminates the need for discrete shunt resistors, reducing cost and board area. The ISL6443IRZ datasheet specifies full-scale current of 32µA for optimal sample-and-hold operation.
Can the ISL6443IRZ be used with both N-channel and P-channel MOSFETs in the linear regulator stage?
The ISL6443IRZ GATE3 output is optimized for driving external PNP transistors or PFETs in the linear regulator path, as stated in the Functional Description. It is not designed to drive N-channel MOSFETs directly due to lack of high-side level-shifting circuitry. Using an N-MOSFET would require external bootstrap or charge-pump circuitry incompatible with the ISL6443IRZ's open-drain GATE3 architecture.
What is the purpose of separate SGND and PGND pins on the ISL6443IRZ?
SGND (small-signal ground) serves as the reference for all error amplifiers, feedback comparators, and control logic, while PGND (power ground) carries high-current return paths for lower gate drivers and input capacitors. Separating them prevents noise coupling from switching currents into sensitive analog circuits. The ISL6443IRZ datasheet mandates routing SGND traces separately and connecting all SGND pins together near the IC, with a local 0.1µF decoupling capacitor.
Is the ISL6443IRZ still recommended for new designs?
No - the ISL6443IRZ datasheet explicitly states "NOT RECOMMENDED FOR NEW DESIGNS. USE ISL6443A". The ISL6443A is the direct functional successor with improved specifications including tighter reference voltage tolerance (±0.5% vs. ±1.0%), enhanced current-sense accuracy, and updated thermal characteristics. However, ISL6443IRZ remains fully supported for legacy design refreshes and repair programs.
ISL6443IRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ISL6443IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6443IRZ 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 reliable?
The price and inventory of ISL6443IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6443IRZ is usually 5 days.
3.What payment methods are accepted for ISL6443IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6443IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6443IRZ?
ISL6443IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6443IRZ 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?
For technical support, including ISL6443IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6443IRZ requirements.
6.How does Aetrix verify that ISL6443IRZ is sourced from the original manufacturer or authorized distributors?
All ISL6443IRZ 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 meets industry standards.
7.What is the process for return or replacement of ISL6443IRZ?
All ISL6443IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6443IRZ, 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 part is unused and in its original packaging.
Return procedure for ISL6443IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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