Renesas ISL9444EVAL1Z

Overview

ISL9444EVAL1Z from Renesas Electronics is an evaluation board for the ISL9444 triple-output synchronous buck controller IC. It implements three independent PWM step-down channels delivering 1.05V@6A, 3.3V@6A, and 1.8V@6A from a 6V–20V input, operating at 600kHz switching frequency with current-mode control and integrated protection (UV/OV/OC/OT).

For engineers reviewing the ISL9444EVAL1Z datasheet, ISL9444EVAL1Z pinout, ISL9444EVAL1Z application, or ISL9444EVAL1Z equivalent, this board enables rapid validation of multi-rail power sequencing, load regulation (<±1%), line regulation (<±1%), soft-start behavior, and ripple performance (e.g., <20mVpp under full load) in embedded and industrial power systems.

Technical Context

The ISL9444EVAL1Z implements the ISL9444 controller in a fully assembled, tested configuration with discrete MOSFETs (IRF7907PBF), power inductors (SPM6530T series), and precision feedback networks. It supports flexible power-up sequencing via jumper-configurable enable logic (J3/J4/J6) and provides test points for all critical nodes - VIN, VO1–VO3, PGOOD signals, phase nodes, and clock output.

Designed for low-current lab validation, the board uses 6A-rated FETs and inductors per channel and integrates external soft-start, independent EN functions, and internal compensation to minimize BOM count. Its 600kHz fixed-frequency operation balances efficiency and component size, with measured efficiency >90% at mid-load across all outputs when VIN = 12V.

Key Specifications

Availability

ISL9444EVAL1Z is available at Aetrix Electronics and suitable for multi-rail power architecture validation, DC-DC controller qualification, and embedded system bring-up requiring stable component supply and documented reference performance.

Supply support for ISL9444EVAL1Z 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 leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.

The ISL9444EVAL1Z belongs to Renesas' high-performance power management evaluation platform family, designed to accelerate development of efficient, sequenced, and protected multi-output DC-DC power supplies for complex embedded systems.

FAQ

What is the primary function of the ISL9444EVAL1Z?

The ISL9444EVAL1Z is a fully assembled evaluation board for the ISL9444 triple synchronous buck controller. It enables hardware validation of three independent, sequenced, and protected DC-DC output rails - 1.05V@6A, 3.3V@6A, and 1.8V@6A - using discrete MOSFETs and optimized passive components. The ISL9444EVAL1Z is not a standalone power module but a reference design platform for engineering verification.

Does the ISL9444EVAL1Z support adjustable output voltages?

No - the ISL9444EVAL1Z is configured with fixed output voltages: 1.05V (PWM1), 3.3V (PWM2), and 1.8V (PWM3). These values are set by factory-installed resistor dividers on the FB1/FB2/FB3 pins of the ISL9444IC. While the underlying ISL9444 controller supports programmable outputs via external resistors, the ISL9444EVAL1Z board itself does not include user-adjustable voltage trim components or potentiometers.

Can the ISL9444EVAL1Z be used for continuous 6A operation per channel?

Yes, the ISL9444EVAL1Z is rated for up to 6A per output channel under proper thermal conditions: ambient ≤40°C, adequate airflow, and no simultaneous full-load operation on all three rails beyond brief transients. The board uses IRF7907PBF dual-N-channel MOSFETs and SPM6530T-series shielded power inductors rated for ≥11A DC current, confirming its suitability for sustained 6A testing as documented in AN1712 efficiency and regulation curves.

How is power sequencing controlled on the ISL9444EVAL1Z?

Sequencing is controlled via three 2×3 headers (J3, J4, J6) that configure enable timing logic. By default, J3 enables PWM1 when VCC5V is ready; J4 enables PWM2 after PGOOD1 asserts; and J6 enables PWM3 to track PWM2. Alternative options include enabling PWM2 on input voltage threshold (PFI) or disabling individual rails. All configurations are implemented through physical jumper position selection - no firmware or software is involved.

What test equipment is required to evaluate the ISL9444EVAL1Z?

Per AN1712, required equipment includes: (1) a 0–20V/10A+ DC power supply; (2) three electronic loads capable of sinking ≥7A each; (3) a 100MHz quad-trace oscilloscope for ripple, ringing, and timing analysis; and (4) digital multimeters for DC accuracy verification. Probe setup must follow Figure 3 guidelines to avoid ground loop errors when measuring output ripple below 20mVpp.