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Renesas ISL6442IAZ
- Part No.:
- ISL6442IAZ
- Manufacturer:
- Renesas
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ISL6442IAZ.pdf
- Description:
- IC REG TRPL BUCK/LNR SYNC 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,877
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Product details
Overview
ISL6442IAZ from Renesas Electronics (formerly Intersil) is a triple-output power controller integrating two 180° out-of-phase voltage-mode PWM buck controllers and one linear controller for broadband, DSL, and networking point-of-load regulation. It delivers ±1.5% reference accuracy, programmable 300kHz–2.5MHz switching frequency, and supports soft-start into pre-biased loads - enabling compact, low-ripple dual-rail supplies in DSL modems and FPGA/ASIC power systems.
For engineers reviewing the ISL6442IAZ datasheet, ISL6442IAZ pinout, ISL6442IAZ application, or ISL6442IAZ equivalent, key selection considerations include its lossless rDS(ON)-based overcurrent protection, independent SS/EN pins with voltage tracking capability, PGOOD delay tied to switching frequency, and 24-lead QSOP package with separate PGND/SGND routing requirements.
Technical Context
The ISL6442IAZ implements synchronized dual PWM control using voltage-mode architecture with dedicated error amplifiers (88dB DC gain, 15MHz GBWP), internal 0.6V reference, and external RT-resistor–programmed oscillator. Its 180° phase shift reduces input RMS current and capacitor stress while maintaining fast transient response via high-bandwidth compensation.
Each PWM channel features lossless current sensing via upper MOSFET rDS(ON), hiccup-mode overcurrent protection triggered after 32 consecutive fault cycles, and independent undervoltage (82% VREF) and overvoltage (116% VREF) detection. The linear controller uses an open-drain PNP driver (LCDR) with LCFB feedback threshold of 0.595V (±25mV over temperature) and supports up to 50mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V–24V (VIN); 5V±10% (VCC direct supply option) |
| Reference Accuracy | ±1.5% over line, load, and -40°C to +85°C - ensures tight output regulation without trimming |
| Switching Frequency | 300kHz–2.5MHz (RT-resistor programmable) - enables optimization of size vs. efficiency |
| Output Voltage Range (PWM) | 0.6V to VIN−1.5V - supports core voltages for DSPs, FPGAs, and ASICs |
| Linear Output Range | 1V–4V (set via external divider on LCFB) - suitable for bias rails and low-current analog supplies |
| Soft-Start Current | 30µA per SS/EN pin - allows precise ramp time control with external capacitor |
| PGOOD Delay | 370ms at 1.4MHz (inversely proportional to FSW) - provides stable power sequencing confirmation |
| Thermal Shutdown | 150°C with 20°C hysteresis - protects against sustained overload or poor heatsinking |
Pinout & Package
ISL6442IAZ is housed in a 24-lead QSOP (Quad Small Outline Package), Pb-free and RoHS-compliant, with 0.635mm lead pitch and thermal resistance θJA = 85°C/W. Pin layout supports strict separation of power ground (PGND) and signal ground (SGND) to minimize noise coupling in multi-output systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SS1/EN1, SS2/EN2 (Pins 2, 11) | Combined soft-start enable input | 30µA current source charges external capacitor; <1V disables channel; enables voltage tracking when tied together during startup |
| FB1, FB2 (Pins 4, 9) | PWM output voltage feedback | Connects to resistor divider; sets output via 0.6V internal reference; also feeds PGOOD and OVP/UVP comparators |
| OCSET1, OCSET2 (Pins 1, 12) | Overcurrent trip threshold input | 110µA current source + external resistor + rDS(ON) defines lossless current limit without sense resistor |
| UGATE1, UGATE2 (Pins 22, 15) | High-side N-MOSFET gate driver output | 0.7A peak drive; bootstrapped from VCC; requires external bootstrap capacitor between BOOTx and PHASEx |
| LGATE1, LGATE2 (Pins 20, 17) | Low-side N-MOSFET gate driver output | 0.7A peak drive sourced from VCC; dead time ~30ns prevents shoot-through |
| PHASE1, PHASE2 (Pins 21, 16) | Switch node connection | Junction of high-side drain, low-side source, and output inductor - critical for layout and EMI control |
| LCDR (Pin 7) | Linear controller PNP base driver | Open-drain PNP output driving external pass transistor; enables adjustable low-noise linear rail |
| LCFB (Pin 8) | Linear controller feedback input | Sets linear output voltage via resistor divider; nominal 0.595V threshold; tie to VCC if unused |
| PGOOD (Pin 13) | Power-good status indicator | Open-drain output pulled low if either PWM output deviates >10% or linear output drops <75% of nominal |
| VIN (Pin 24) | Main input supply input | Accepts 5.5V–24V; powers internal 5V LDO (VCC) when >5.5V; must be decoupled with ceramic capacitor |
| VCC (Pin 19) | Bias supply / LDO output | 5V±10% output when VIN >5.5V; can be used as direct 5V input; powers gate drivers and logic |
| RT (Pin 5) | Oscillator frequency set | Resistor to SGND programs FSW from 300kHz to 2.5MHz - determines component size and transient response |
| PGND (Pin 18) | Power ground return | Return path for low-side drivers and input capacitors; must be routed separately from SGND |
| SGND (Pin 6) | Signal ground reference | Common reference for FB, COMP, RT, SS/EN, and all analog circuitry - isolate from PGND |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase dual PWM | Reduces input ripple current by ~30% and minimizes bulk capacitor sizing in shared-input systems |
| Voltage-mode PWM control | Enables stable loop compensation with Type II/III networks; simplifies design vs. current-mode for multi-phase sync |
| Lossless overcurrent protection | Eliminates current-sense resistor, saving board space and conduction losses while retaining accurate trip level |
| Independent soft-start with tracking | Allows controlled ramp-up of multiple rails - e.g., 1.8V and 3.3V outputs track until 1.8V is reached, then hold |
| Pre-biased soft-start capability | Supports seamless startup into existing output voltage (e.g., hot-swap or partial system reset) without reverse current |
| Integrated 5V LDO (VCC) | Provides regulated bias for gate drivers and logic when powered from wide-input 5.5V–24V supply - no external 5V rail needed |
Applications
| DSL Modem Power Management | FPGA Core & I/O Rail Sequencing |
|---|---|
Use Scenario: Single-chip power solution for ADSL/VDSL modems requiring tightly regulated 1.2V CPU core, 2.5V PHY, and 3.3V interface rails. IC Role / Device Role / Timing Role: Dual PWM controllers deliver 180° out-of-phase 1.2V/2.5V outputs; linear controller supplies clean 3.3V bias; PGOOD confirms all rails stable before firmware boot. Use Value: Reduces BOM count by consolidating three regulators, cuts input capacitance by 40% via phase interleaving, and ensures monotonic startup into pre-charged lines. |
Use Scenario: Point-of-load regulation for Xilinx Spartan or Intel Cyclone FPGA with separate core (1.0V), auxiliary (2.5V), and I/O (3.3V) supplies. IC Role / Device Role / Timing Role: ISL6442IAZ generates core and auxiliary rails via PWM channels with voltage tracking; linear rail powers configuration EEPROM or transceivers; SS/EN pins coordinate safe power-up order. Use Value: Enables precise rail sequencing (e.g., 1.0V tracks 2.5V to 1.0V, then holds), eliminates need for external sequencer IC, and supports hot-swap reconfiguration without latch-up. |
| DSP-Based Voice Gateway | Networking Switch ASIC Supply |
Use Scenario: Powering TI C6000-series DSPs in VoIP gateways needing 1.4V core, 3.3V I/O, and 1.8V memory interface rails. IC Role / Device Role / Timing Role: PWM1 regulates 1.4V core; PWM2 regulates 3.3V I/O; linear controller supplies 1.8V DDR termination; PGOOD enables clock distribution only after all rails settle. Use Value: Achieves ±1.5% output accuracy across temperature, suppresses 12V input ripple via interleaved operation, and avoids external current-sense resistors in high-efficiency design. |
Use Scenario: Multi-rail supply for Broadcom BCM56xx switch ASICs requiring 1.0V core, 1.2V SerDes, and 2.5V management processor rails. IC Role / Device Role / Timing Role: Dual PWM channels deliver 1.0V and 1.2V with 180° phase shift; linear regulator supplies 2.5V management rail; OCSET pins allow per-rail current limiting tuned to ASIC block loading. Use Value: Delivers fast transient response (<5µs recovery) to burst traffic loads, reduces thermal stress on input caps, and supports hiccup-mode fault recovery during cable short events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2940AGQSE-LF-Z (Monolithic Power) | Single 5V input; integrates MOSFETs; fixed 600kHz FSW; no linear controller; uses current-mode control | Targeted at simpler, lower-cost designs where integrated FETs reduce layout complexity but flexibility is reduced | Choose MP2940 if board space is constrained and discrete MOSFETs are undesirable; avoid if linear rail or programmable frequency is required. |
| TPS51220ARGER (Texas Instruments) | Dual PWM only (no linear controller); supports 3–24V input; includes D-CAP2 control; offers VR12.5 compliance and SVID interface | Designed for Intel CPU VR applications; lacks linear output and voltage tracking; optimized for dynamic load step response | Choose TPS51220 for notebook CPU core/I/O regulation; not suitable for DSL modem or FPGA bias rail needs served by ISL6442IAZ. |
Compared with MP2940AGQSE-LF-Z and TPS51220ARGER, the ISL6442IAZ uniquely combines dual interleaved PWM with a dedicated linear controller, voltage tracking, and lossless current sensing - making it optimal for broadband infrastructure where rail count, sequencing control, and efficiency coexist under wide-input conditions.
Availability
ISL6442IAZ is available at Aetrix Electronics and suitable for DSL modems, FPGA power systems, networking switches, and voice gateway designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6442IAZ 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 continuity for legacy power management ICs like the ISL6442IAZ.
The ISL6442IAZ belongs to Intersil's high-density multi-output controller product line, designed specifically for broadband access equipment requiring compact, efficient, and highly integrated power solutions with robust protection and sequencing control.
FAQ
What input voltage ranges does the ISL6442IAZ support?
The ISL6442IAZ supports two input configurations: 5.5V–24V applied to the VIN pin (which internally regulates to 5V VCC), or direct 5V±10% applied to the VCC pin. The 4.5V–5.5V range cited in some summaries refers to legacy test conditions - the validated operating range per datasheet is 5.5V–24V for VIN and 4.5V–5.5V only when VCC is externally supplied. This dual-input flexibility allows use in both wide-range telecom and fixed 5V embedded systems.
How does the ISL6442IAZ achieve lossless overcurrent protection?
The ISL6442IAZ senses output current by monitoring the voltage drop across the upper MOSFET's rDS(ON) during its on-time, using an internal 110µA current source at the OCSET pin and an external resistor. This eliminates the need for a discrete current-sense resistor, reducing power loss and PCB area. The PHASE node is compared to OCSET while the high-side FET is conducting; a mismatch triggers immediate pulse termination and, after 32 consecutive faults, enters hiccup-mode soft-start recovery - a feature confirmed in the FN9204 datasheet Section "Protection Mechanisms".
Can the ISL6442IAZ soft-start into a pre-biased output voltage?
Yes, the ISL6442IAZ supports soft-start into pre-biased loads on both PWM outputs. When the SS/EN ramp voltage is below the existing output voltage, the low-side MOSFET remains off until the ramp exceeds that voltage, preventing reverse current flow. If the output is pre-biased above the target (but below OVP threshold), the output holds until soft-start completes, then pulls down to regulation. This behavior is explicitly verified in Figure 8 and described in the "Soft-Start and Voltage Tracking" section of the ISL6442IAZ datasheet.
What is the function of the LCDR and LCFB pins on the ISL6442IAZ?
LCDR (Pin 7) is an open-drain PNP transistor driver that controls the base of an external PNP pass device to form a positive linear regulator. LCFB (Pin 8) is its feedback input, with a nominal 0.595V threshold - an external resistor divider sets the linear output voltage. If the linear controller is unused, LCFB must be tied to VCC to disable it and maintain PGOOD functionality. These pins enable a low-noise, low-current auxiliary rail (e.g., 3.3V for EEPROM or PHY bias) without adding a separate LDO IC.
How is PGOOD timing determined for the ISL6442IAZ?
The ISL6442IAZ PGOOD delay is fixed and inversely proportional to switching frequency: tPGOOD = 0.5236 / FSW (with FSW in MHz). At 1.4MHz, delay is 370ms; at 300kHz, it extends to ~1.75s. PGOOD asserts only after both PWM outputs are within ±10% of regulation and the linear output exceeds 75% of nominal - confirmed in the "PGOOD" section (Page 9) and Electrical Specifications table (Page 6). No external adjustment is possible; design must accommodate this frequency-dependent timing.
ISL6442IAZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Last Time Buy
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (1)
- Number of Outputs:
- 3
- Frequency - Switching:
- 300kHz ~ 2.55MHz
- 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 ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QSOP
ISL6442IAZ FAQ
1.How can I place an order for ISL6442IAZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6442IAZ 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 ISL6442IAZ reliable?
The price and inventory of ISL6442IAZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6442IAZ is usually 5 days.
3.What payment methods are accepted for ISL6442IAZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6442IAZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6442IAZ?
ISL6442IAZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6442IAZ 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 ISL6442IAZ?
For technical support, including ISL6442IAZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6442IAZ requirements.
6.How does Aetrix verify that ISL6442IAZ is sourced from the original manufacturer or authorized distributors?
All ISL6442IAZ 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 ISL6442IAZ meets industry standards.
7.What is the process for return or replacement of ISL6442IAZ?
All ISL6442IAZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6442IAZ, 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 ISL6442IAZ part is unused and in its original packaging.
Return procedure for ISL6442IAZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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