Renesas ISL6442EVAL1Z

Overview

ISL6442EVAL1Z from Renesas Electronics is an evaluation board designed to characterize the ISL6442 dual synchronous buck controller with integrated linear regulator. It delivers 1.8V@3A and 3.3V@3A switcher outputs plus a [email protected] linear output, operating at ~1.4MHz switching frequency with independent soft-start and overcurrent hiccup protection. It supports quick-start testing using a single 6V input supply and features turret terminals, scope probe sockets, and jumper-controlled enable/disable for each switcher output.

For engineers reviewing the ISL6442EVAL1Z datasheet, ISL6442EVAL1Z pinout, ISL6442EVAL1Z application, or ISL6442EVAL1Z equivalent, this board enables rapid validation of multi-rail power sequencing, transient response, efficiency, and fault behavior in embedded computing and industrial control designs requiring tightly regulated dual-core or SoC supply rails.

Technical Context

The ISL6442EVAL1Z implements the ISL6442 (QSOP-24) controller IC driving two external FDS6912A dual N-channel MOSFETs per phase and one FZT749 PNP transistor for the linear regulator. It uses resistor-programmable RT pin timing (R4 = 10.2kΩ sets ~1.4MHz), FB-resistor dividers for output voltage setting (e.g., R25/R36 for VOUT1 = 1.8V), and SS/EN pins with discrete capacitors for synchronized soft-start ramping.

Board-level design includes dedicated input turrets for shared VIN (P1) and isolated VIN3 (P7), individual VOUT/GND turrets for all three outputs, and test points (TP1–TP14) for probing waveforms without loading. JP1 and JP2 provide hardware disable capability for VOUT1 and VOUT2 by grounding their respective SS/EN pins.

Key Specifications

Availability

ISL6442EVAL1Z is available at Aetrix Electronics and suitable for embedded computing, industrial control, and FPGA/ASIC power validation requiring stable component supply, fast turnaround evaluation, and full documentation support including schematic, BOM, and layout files.

Supply support for ISL6442EVAL1Z 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 is a global semiconductor manufacturer delivering microcontrollers, analog, power, and mixed-signal solutions for automotive, industrial, and enterprise applications.

The ISL6442EVAL1Z belongs to Renesas' legacy Intersil power management evaluation platform family, engineered specifically to accelerate development of high-efficiency, multi-rail DC/DC power supplies for computer systems and complex SoCs.

FAQ

What is the primary function of the ISL6442EVAL1Z evaluation board?

The ISL6442EVAL1Z evaluation board is a fully assembled platform for evaluating the ISL6442 dual synchronous buck controller with integrated linear regulator. It provides three regulated outputs - 1.8V@3A, 3.3V@3A, and [email protected] - and enables engineers to validate power sequencing, transient response, efficiency, and fault protection behavior before integrating the ISL6442 into final designs. The ISL6442EVAL1Z includes all necessary passive components, MOSFET drivers, and test points for real-world characterization.

Can the ISL6442EVAL1Z support higher output currents than 3A on the switcher rails?

The ISL6442EVAL1Z is configured for up to 3A per switcher output using FDS6912A dual N-channel MOSFETs in SO-8 packages. While the ISL6442 gate drivers are rated for up to 25A with discrete external FETs, the ISL6442EVAL1Z board layout and thermal design do not support sustained >3A operation without modification. Users must monitor FET temperature and ensure adequate input supply capacity when approaching maximum load limits on the ISL6442EVAL1Z.

How is switching frequency set on the ISL6442EVAL1Z?

Switching frequency on the ISL6442EVAL1Z is set by resistor R4 (10.2kΩ) connected between the RT pin of the ISL6442IAZ and ground, yielding a nominal frequency of ~1.4MHz. This value is confirmed in AN1181 Rev 1.00 and aligns with the ISL6442 datasheet's RT-to-frequency curve. Changing R4 allows adjustment across the ISL6442's supported range (300kHz–2MHz), but requires recalculating inductor and capacitor values for stability and ripple performance on the ISL6442EVAL1Z.

Does the ISL6442EVAL1Z support independent input voltages for the switchers and linear regulator?

Yes - the ISL6442EVAL1Z provides separate input connections: P1 (VIN) supplies both switcher channels, while P7 (VIN3) feeds the linear regulator independently. This allows users to evaluate scenarios where the linear rail originates from a different source (e.g., a standby supply or auxiliary rail), enabling accurate modeling of real-system power architecture. The ISL6442EVAL1Z schematic confirms galvanic separation between VIN and VIN3 paths.

What protection features can be validated using the ISL6442EVAL1Z?

The ISL6442EVAL1Z supports validation of overcurrent hiccup mode (demonstrated in Figure 7 of AN1181), soft-start sequencing (Figures 3–4), and PGOOD assertion timing. OCSET1 and OCSET2 resistors (R31 = 2.15kΩ) configure current-limit thresholds, and disabling VOUT1/VOUT2 via JP1/JP2 allows safe functional isolation. The ISL6442EVAL1Z does not implement thermal shutdown or UVLO testing circuitry - those rely on internal ISL6442 functions verified indirectly through operational margins.