Renesas ISL8023IRTAJZ-T

Overview

ISL8023IRTAJZ-T from Renesas (formerly Intersil) is a monolithic synchronous buck regulator delivering up to 3A continuous output current from a 2.7V–5.5V input, featuring integrated 45mΩ P-Channel and 19mΩ N-Channel MOSFETs, 1MHz default switching frequency, and 0.6V ±0.5% reference voltage. It supports 100% duty-cycle operation for ultra-low dropout and is used in point-of-load power for microcontrollers and FPGAs.

For engineers reviewing the ISL8023IRTAJZ-T datasheet, ISL8023IRTAJZ-T pinout, ISL8023IRTAJZ-T application, or ISL8023IRTAJZ-T equivalent, key selection criteria include adjustable 500kHz–4MHz switching frequency, internal/external soft-start, hiccup-mode overcurrent protection, power-good monitoring with 1ms delay, and thermal shutdown at 150°C.

Technical Context

The ISL8023IRTAJZ-T employs current-mode PWM control with slope compensation (440mV/Ts) and a transconductance error amplifier (80µA/V typical) for fast transient response and stable loop dynamics. Its dual-MOSFET architecture enables high-efficiency regulation across wide load ranges, with peak current limiting (5.2–7.8A) and zero-cross detection for skip-mode operation.

It integrates comprehensive fault protection: overtemperature shutdown (150°C with 25°C hysteresis), overvoltage (0.8V PG threshold), undervoltage (80–90% of nominal), negative current limiting (−3.0 to −1.8A), and hiccup-mode recovery after 17 consecutive overcurrent faults. The 1ms PG timer and soft-stop discharge via 100Ω internal switch support robust system sequencing.

Key Specifications

Pinout & Package

ISL8023IRTAJZ-T is housed in a 16-lead 3mm × 3mm Pb-free TQFN package with exposed thermal pad, optimized for compact DC/DC POL designs (<0.22 in² total solution area) and enhanced thermal performance (θ_JA = 45°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54331DR and MP2315GJ-Z, the ISL8023IRTAJZ-T uniquely combines ultra-low input voltage support (2.7V), PFM/PWM mode selection, soft-stop discharge, and pre-biased start-up - making it optimal for portable, battery-critical designs where input range, sequencing integrity, and standby efficiency are jointly constrained.

Availability

ISL8023IRTAJZ-T is available at Aetrix Electronics and suitable for DC/DC POL modules, μC/FPGA core power, and Li-ion battery-powered devices requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for ISL8023IRTAJZ-T 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, formed from the merger of Intersil and Renesas, is a global semiconductor leader specializing in microcontrollers, analog power, and mixed-signal solutions for industrial, automotive, and computing markets.

The ISL8023IRTAJZ-T belongs to Renesas' high-efficiency monolithic buck regulator product line, designed specifically for space-constrained, battery-operated applications demanding low quiescent current, precise regulation, and robust fault protection.

FAQ

What is the maximum output current supported by the ISL8023IRTAJZ-T?

The ISL8023IRTAJZ-T delivers up to 3A of continuous output current under recommended operating conditions (T_A = –40°C to +85°C, V_IN = 3.6V). Peak current limit is specified at 5.2–7.8A depending on application conditions, enabling robust transient handling without derating in typical PCB layouts with adequate thermal vias to the exposed pad.

Does the ISL8023IRTAJZ-T support adjustable output voltage?

Yes, the ISL8023IRTAJZ-T supports fully adjustable output voltage via an external resistor divider connected to the FB pin. With its 0.600V ±0.005V internal reference, outputs from 0.8V up to near the input rail can be set - for example, 1.2V using R2 = 100kΩ and R3 = 100kΩ - and maintains <0.2%/V line regulation across the input range.

How does the ISL8023IRTAJZ-T handle short-circuit conditions?

The ISL8023IRTAJZ-T uses hiccup-mode current limiting for short-circuit protection: upon detecting 17 consecutive overcurrent events, it shuts down and attempts automatic restart after eight soft-start periods. This limits average power dissipation and prevents thermal runaway while allowing self-recovery when the fault clears - a behavior confirmed in the FN7812 datasheet Figure 30 and Theory of Operation section.

Can the ISL8023IRTAJZ-T start up with a pre-biased output?

Yes, the ISL8023IRTAJZ-T supports pre-biased output start-up. During soft-start, it operates in SKIP mode to prevent reverse current flow into the output capacitor. This is explicitly documented in the datasheet's "Soft Start-Up" section and validated in Figure 23 (Soft-Start with Pre-Biased 1V), making it suitable for hot-swap and redundant power architectures.

What thermal performance can be expected from the ISL8023IRTAJZ-T in a standard layout?

In a standard 4-layer PCB with 2oz copper, 6+ thermal vias under the exposed pad tied to a solid SGND plane, the ISL8023IRTAJZ-T achieves θ_JA ≈ 45°C/W. At 3A output and 5V input, typical power dissipation is ~0.45W, resulting in ~20°C junction-to-ambient rise - well below the 125°C max operating junction temperature, provided ambient stays ≤65°C.