Renesas ISL8026IRTAJZ-T7A

Overview

ISL8026IRTAJZ-T7A from Renesas (formerly Intersil) is a monolithic synchronous buck regulator delivering 6A continuous output current from a 2.5V–5.5V input, featuring integrated 36mΩ P-channel and 13mΩ N-channel MOSFETs, 1MHz default switching frequency, and 0.6V reference voltage with ±1% accuracy over –40°C to +85°C. It powers microcontroller cores, FPGA I/O banks, and video SoCs in space-constrained industrial and portable systems.

For engineers reviewing the ISL8026IRTAJZ-T7A datasheet, ISL8026IRTAJZ-T7A pinout, ISL8026IRTAJZ-T7A application, or ISL8026IRTAJZ-T7A equivalent, key selection criteria include its 16-lead 3×3mm TQFN package, internal/external compensation flexibility, forced-continuous or discontinuous light-load operation, and integrated hiccup-mode overcurrent protection with soft-stop output discharge.

Technical Context

The ISL8026IRTAJZ-T7A employs current-mode control architecture enabling fast transient response and stable loop behavior at high duty cycles and up to 4MHz switching frequency. Its integrated power stage supports 100% duty-cycle operation for <180mV dropout at 6A, critical for low-VIN, high-current POL applications.

It implements dual-mode operation: PWM for low-noise regulation and PFM for light-load efficiency optimization. Fault protection includes overtemperature shutdown (150°C trip), overvoltage/undervoltage monitoring via FB, and negative current limiting (–1.5A to –4.5A), all managed by on-chip logic without external components.

Key Specifications

Pinout & Package

ISL8026IRTAJZ-T7A is housed in a RoHS-compliant, thermally enhanced 16-lead 3×3mm TQFN package with exposed pad (L16.3x3D), optimized for PCB heat dissipation and ≤0.8mm profile in ultra-thin applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with ISL8026AIRTAJZ-T7A, the ISL8026IRTAJZ-T7A offers lower switching losses at 1MHz in thermally constrained environments; versus TPS54620RGYT, it provides superior light-load efficiency below 100mA due to PFM mode and lower quiescent current (50µA vs. 120µA).

Availability

ISL8026IRTAJZ-T7A is available at Aetrix Electronics and suitable for microprocessor core power, FPGA I/O supply, and Li-ion powered portable instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ISL8026IRTAJZ-T7A 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 its high-performance analog and power management portfolio, emphasizing reliability, thermal efficiency, and integration for industrial and computing applications.

The ISL8026 product line delivers compact, high-current synchronous buck regulators targeting point-of-load conversion in space- and thermal-constrained digital systems, with emphasis on low dropout, fast transient response, and comprehensive fault protection.

FAQ

What is the maximum continuous output current supported by the ISL8026IRTAJZ-T7A?

The ISL8026IRTAJZ-T7A supports 6A of continuous output current across its full operating temperature range (–40°C to +85°C) when used with appropriate PCB layout, thermal vias under the exposed pad, and recommended input/output capacitors. This rating assumes proper heatsinking via the exposed thermal pad and adherence to the 47°C/W θ_JA thermal resistance specification in standard JEDEC high-K board conditions.

Does the ISL8026IRTAJZ-T7A support external synchronization of its switching frequency?

Yes, the ISL8026IRTAJZ-T7A supports external synchronization up to 4MHz via the SYNC pin. When driven with a clean square wave, the device locks its internal oscillator to the external clock's positive edge, enabling coherent switching in multi-rail systems to minimize beat frequencies and simplify EMI filtering. The SYNC pin also serves as a mode select for PWM/PPM operation when held static.

How does the soft-stop function operate during shutdown of the ISL8026IRTAJZ-T7A?

During shutdown (EN low), the ISL8026IRTAJZ-T7A activates an internal soft-stop switch between the PHASE node and PGND, actively discharging the output capacitor through a controlled path. This prevents the output rail from floating or retaining charge, ensuring safe, predictable power-down sequencing for downstream logic and avoiding latch-up in interconnected ICs.

What is the purpose of the PGND/SGND pin (Pin 10) on the ISL8026IRTAJZ-T7A?

The PGND/SGND pin (Pin 10) serves as the combined reference node for both power-ground return paths and signal-ground references, including the error amplifier, soft-start circuitry, and power-good comparator. It must be connected directly to the exposed thermal pad and routed to a solid ground plane to minimize noise coupling into sensitive analog blocks and ensure accurate feedback regulation and PG assertion timing.

Can the ISL8026IRTAJZ-T7A operate with 100% duty cycle, and what design benefit does this provide?

Yes, the ISL8026IRTAJZ-T7A supports true 100% duty cycle operation, enabling output voltages approaching the input rail minus small conduction losses. At 6A output, this yields less than 180mV dropout - critical for maintaining regulation during deep battery discharge (e.g., down to 2.5V VIN for a 2.3V VOUT rail) without requiring a second-stage LDO, thereby improving overall system efficiency and simplifying power architecture.