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Renesas ISL6443AIVZ
- Part No.:
- ISL6443AIVZ
- Manufacturer:
- Renesas
- Category:
- Power Management - Specialized
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ISL6443AIVZ.pdf
- Description:
- IC CTRLR SGL/STP DWN PWM 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,877
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Product details
Overview
ISL6443AIVZ from Renesas Electronics (formerly Intersil) is a triple-output DC/DC controller integrating two 300kHz out-of-phase synchronous buck PWM controllers and one linear regulator controller, designed for wall adapter, battery, or intermediate bus power conversion in telecom and embedded systems. It supports input voltage ranges of 5.6V–24V or 4.5V–5.6V, delivers adjustable outputs down to 0.8V, and reduces RMS input ripple via 180° phase interleaving.
For engineers reviewing the ISL6443AIVZ datasheet, ISL6443AIVZ pinout, ISL6443AIVZ application, or ISL6443AIVZ equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and protection behavior, real-world soft-start sequencing capability, and precise alternative selection guidance for multi-rail power supply design.
Technical Context
The ISL6443AIVZ implements current-mode PWM control with input voltage feed-forward ramp generation, enabling stable regulation across wide VIN variations and simplified loop compensation. Its dual PWM channels operate at a fixed 300kHz switching frequency with adaptive dead-time gate drivers and bidirectional SYNC capability for multi-controller synchronization.
Overcurrent protection uses lower-MOSFET rDS(ON) sensing without external resistors, latching hiccup mode after two consecutive clock-cycle faults. The linear controller drives PNP/PFET pass devices with 0.8V reference, 75% undervoltage threshold, and open-drain GATE3 output - all referenced to dedicated SGND separate from PGND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 300 kHz ±13% - sets minimum inductor size, EMI profile, and input capacitor RMS current rating. |
| Input Voltage Range | 5.6 V to 24 V or 4.5 V to 5.6 V - supports universal AC adapter inputs and 5 V rail-powered operation with VIN tied to VCC_5V. |
| Output Voltage Range | 0.8 V to VIN − Vd1 - enables core logic (1.2 V), I/O (3.3 V), and analog (2.5 V) rails with resistor-divider programming. |
| PGOOD Thresholds | PWM outputs: ±10% of setpoint; Linear output: >75% of setpoint - ensures system-level power sequencing integrity before release. |
| Thermal Shutdown | 150 °C junction temperature with 20 °C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Soft-Start Current | 5 µA constant-current source - enables precise timing control of output ramp-up via external capacitor (tSS = 0.8 V / 5 µA × CSS). |
| Gate Drive Strength | 400 mA sink/source per driver - supports fast turn-on/turn-off of MOSFETs up to ~15 nC gate charge at 300 kHz. |
Pinout & Package
ISL6443AIVZ is housed in a 28-lead TSSOP package (JEDEC MO-173AA), 9.7 mm × 4.4 mm × 1.2 mm, with exposed thermal pad. Pin 1 marked by dot; pin 20 is SGND. Requires separate routing of SGND (signal ground) and PGND (power ground) to avoid noise coupling into feedback paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB1, FB2, FB3 | Voltage feedback inputs | Connect to resistor dividers; set output voltage via 0.8 V reference; used by PGOOD monitoring logic. |
| ISEN1, ISEN2 | Current sense inputs | Monitor voltage drop across lower MOSFET rDS(ON); enable no-resistor overcurrent detection. |
| UGATE1, UGATE2 | High-side N-MOSFET gate drivers | Drive upper FET gates via boot circuit; require external bootstrap diode/capacitor between BOOT and PHASE. |
| LGATE1, LGATE2 | Low-side N-MOSFET gate drivers | Directly sourced from VCC_5V; 400 mA peak drive supports fast switching with minimal external components. |
| GATE3 | Linear regulator output driver | Open-drain output driving PNP emitter or PFET source; requires external pass device and bias network. |
| SD1, SD2 | Independent PWM shutdown inputs | Logic-high enables respective PWM; logic-low disables output and affects PGOOD assertion per Table 1. |
| SS1, SS2 | Soft-start timing inputs | 5 µA internal current charges external capacitor; ramps reference from 0 V to 0.8 V to control output slew rate. |
| PGOOD | Power-good status indicator | Open-drain output pulled low if any enabled output falls outside regulation window or soft-start incomplete. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase PWM operation | Reduces input capacitor RMS current by ~30%, lowers EMI, and allows smaller/cheaper bulk capacitance. |
| No external current-sense resistor | Leverages lower MOSFET rDS(ON) for overcurrent detection - eliminates component count, board space, and power loss. |
| Independent soft-start and shutdown | Enables precise power sequencing (e.g., core before I/O) and dynamic rail disabling without affecting other outputs. |
| Bidirectional SYNC capability | Allows master-slave or peer-to-peer synchronization of multiple ISL6443AIVZ controllers to eliminate beat frequencies. |
| Dedicated SGND and PGND pins | Prevents ground bounce from high di/dt switching currents from corrupting feedback and reference signals. |
Applications
| xDSL Modem Power Supply | DSP/FPGA Core + I/O Supply |
|---|---|
Use Scenario: Dual-rail power delivery for ADSL/VDSL line card with separate 1.2 V DSP core and 3.3 V interface logic. IC Role / Device Role / Timing Role: ISL6443AIVZ acts as primary multi-output controller managing buck converters for core and I/O rails plus linear regulator for analog bias. Use Value: Out-of-phase PWM reduces input ripple on shared 12 V adapter rail, easing EMI filter design and improving conducted emissions compliance. |
Use Scenario: Sequenced startup for FPGA-based industrial controller requiring 1.0 V core, 2.5 V auxiliary, and 3.3 V I/O rails. IC Role / Device Role / Timing Role: ISL6443AIVZ provides independent SS1/SS2 control to stagger PWM outputs and GATE3-driven linear rail for clean analog supply. Use Value: Programmable soft-start capacitors enable exact voltage ramp alignment (e.g., CSS1/CSS2 = 1.0/3.3), preventing latch-up during power-up. |
| Set-Top Box Mainboard | Telecom Line Card |
Use Scenario: Compact power solution for STB mainboard with 3.3 V USB, 2.5 V memory, and 1.8 V SoC core. IC Role / Device Role / Timing Role: ISL6443AIVZ integrates three regulated outputs in single TSSOP package, minimizing PCB area vs discrete controllers. Use Value: Single 5 V internal LDO (VCC_5V) powers gate drivers and boot circuits - eliminates need for external 5 V bias rail. |
Use Scenario: Power management for multi-port VoIP line card with isolated 3.3 V data plane and 5 V control plane rails. IC Role / Device Role / Timing Role: ISL6443AIVZ manages non-isolated secondary-side rails while supporting SYNC to align switching with upstream isolator clocks. Use Value: Bidirectional SYNC pin enables deterministic jitter reduction across distributed power domains without external clock generator. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6443AIRZ | Identical electrical specs; packaged in 28-lead 5×5 mm QFN instead of TSSOP - lower thermal resistance (θJA = 36°C/W vs 75°C/W) and improved high-frequency performance. | Preferred for thermally constrained or high-density layouts where PCB space and thermal dissipation are critical. | Select ISL6443AIRZ when board layout allows QFN mounting and thermal management requires lower junction rise. |
| RT8205AZSP | Single-chip dual-buck + LDO controller; 500 kHz switching; no out-of-phase operation; integrated MOSFET drivers but no SYNC or hiccup-mode OCP. | Suitable for cost-sensitive, lower-power (<1.5 A per rail) consumer applications where interleaving and robust fault recovery are not required. | Choose RT8205AZSP only for simple, low-cost designs lacking sequencing, synchronization, or hiccup-mode protection needs. |
Compared with ISL6443AIVZ, ISL6443AIRZ offers superior thermal performance in compact form factor but requires rework for QFN soldering; RT8205AZSP simplifies BOM but sacrifices phase interleaving, programmable soft-start, and comprehensive protection - making it unsuitable for telecom or industrial use cases demanding reliability and noise control.
Availability
ISL6443AIVZ is available at Aetrix Electronics and suitable for xDSL modems, set-top boxes, DSP/FPGA power supplies, and telecom line cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6443AIVZ 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 acquired Intersil in 2017 and maintains full product support, documentation, and qualification for legacy Intersil power management ICs including the ISL6443A series.
The ISL6443AIVZ belongs to Renesas' high-performance multi-rail DC/DC controller family, engineered specifically for telecom infrastructure, broadband access equipment, and embedded systems requiring precise sequencing, low-noise operation, and robust fault handling.
FAQ
What is the maximum input voltage supported by the ISL6443AIVZ?
The ISL6443AIVZ supports two input configurations: 5.6 V to 24 V when powered from VIN, or 4.5 V to 5.6 V when powered from the VCC_5V pin. Absolute maximum VIN is +27 V, but operation above 24 V risks exceeding maximum duty cycle limits and may violate safe operating area constraints. The ISL6443AIVZ internal LDO dropout is ~600 mV, so VCC_5V remains stable at ~5 V when VIN ≥ 5.6 V.
Does the ISL6443AIVZ require external current-sense resistors for overcurrent protection?
No, the ISL6443AIVZ does not require external current-sense resistors. It uses the rDS(ON) of the lower MOSFET in each buck stage to sense output current via the ISEN1 and ISEN2 pins. An external resistor from OCSET1/OCSET2 to ground sets the overcurrent threshold voltage (1.7 V nominal). This architecture eliminates power loss and board space associated with shunt resistors while maintaining accurate current limiting.
How does the PGOOD signal behave when only one PWM output is enabled?
When only one PWM output is enabled (e.g., SD1 = HIGH, SD2 = LOW), the ISL6443AIVZ asserts PGOOD HIGH only if the enabled PWM output is within ±10% of its setpoint, its soft-start is complete, and the linear regulator output exceeds 75% of its setpoint. The disabled PWM output is ignored in PGOOD evaluation - enabling flexible partial-rail operation without false fault indication. This behavior is defined in Table 1 of the ISL6443AIVZ datasheet.
Can the ISL6443AIVZ synchronize with controllers from other manufacturers?
The ISL6443AIVZ SYNC pin is designed for bidirectional synchronization with identical ISL6443AIVZ or ISL6443AIRZ devices only. Its input threshold (3.5 V HIGH, 1.5 V LOW) and 5 MHz sync frequency range are not guaranteed compatible with third-party controllers. For cross-manufacturer sync, external clock conditioning or level-shifting circuitry would be required - but Renesas does not validate or characterize such configurations for the ISL6443AIVZ.
What is the purpose of the separate SGND and PGND pins on the ISL6443AIVZ?
The ISL6443AIVZ separates SGND (small-signal ground, Pin 20) from PGND (power ground, Pin 9) to prevent high di/dt switching currents from inducing noise in sensitive analog circuits - especially the error amplifiers, reference, and feedback comparators. SGND serves as the reference for all control signals (FBx, SSx, OCSETx); PGND carries return current for lower MOSFETs and input capacitors. Mixing them degrades regulation accuracy and can cause instability or false PGOOD assertion.
ISL6443AIVZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Power Supplies
- Current - Supply:
- 2mA
- Voltage - Supply:
- 5.6V ~ 24V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
ISL6443AIVZ FAQ
1.How can I place an order for ISL6443AIVZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6443AIVZ 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 ISL6443AIVZ reliable?
The price and inventory of ISL6443AIVZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6443AIVZ is usually 5 days.
3.What payment methods are accepted for ISL6443AIVZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6443AIVZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6443AIVZ?
ISL6443AIVZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6443AIVZ 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 ISL6443AIVZ?
For technical support, including ISL6443AIVZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6443AIVZ requirements.
6.How does Aetrix verify that ISL6443AIVZ is sourced from the original manufacturer or authorized distributors?
All ISL6443AIVZ 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 ISL6443AIVZ meets industry standards.
7.What is the process for return or replacement of ISL6443AIVZ?
All ISL6443AIVZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6443AIVZ, 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 ISL6443AIVZ part is unused and in its original packaging.
Return procedure for ISL6443AIVZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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