Renesas ISL8023AIRTAJZ

Overview

ISL8023AIRTAJZ 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 adjustable output voltage via external resistor divider and is used in point-of-load power for microcontrollers and FPGAs.

For engineers reviewing the ISL8023AIRTAJZ datasheet, ISL8023AIRTAJZ pinout, ISL8023AIRTAJZ application, or ISL8023AIRTAJZ equivalent, key selection criteria include its 100% duty-cycle capability (<200mV dropout at full load), hiccup-mode overcurrent protection, soft-stop output discharge, and compatibility with 500kHz–4MHz frequency adjustment - all critical for compact, high-efficiency DC/DC designs in battery-powered and space-constrained systems.

Technical Context

The ISL8023AIRTAJZ employs current-mode PWM control with slope compensation (440mV/Ts) and transconductance error amplifier (80µA/V internal, 150µA/V with external FS resistor), enabling fast transient response and stable loop behavior across 500kHz–4MHz operation. Its dual-mode operation (PWM or PFM via SYNC pin) allows dynamic trade-off between low-noise performance and light-load efficiency.

It integrates comprehensive protection: overtemperature shutdown (150°C trip, 25°C hysteresis), overvoltage (0.8V PG threshold), undervoltage (80–90% of VOUT), negative current limiting (−2.4A), and cycle-by-cycle peak current limiting (5.2–7.8A depending on configuration). The 1ms power-good delay and pre-biased start-up support robust system sequencing.

Key Specifications

Pinout & Package

ISL8023AIRTAJZ is housed in a 16-lead 3mm × 3mm Pb-free TQFN package with exposed thermal pad (L16.3x3D), optimized for low θJA (45°C/W) and minimal PCB footprint (<0.22 in²).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS543320RHLT and MP2332HGTL-Z, the ISL8023AIRTAJZ uniquely combines single-cell Li-ion compatibility (2.7V min Vin), integrated soft-stop discharge, 1ms PG timer, and PFM/PWM mode flexibility - making it optimal for portable, battery-first designs requiring robust sequencing and safety compliance.

Availability

ISL8023AIRTAJZ is available at Aetrix Electronics and suitable for microcontroller core supplies, FPGA I/O power, portable instrumentation, Li-ion–powered wireless nodes, and test equipment requiring stable component supply with long-term lifecycle assurance.

Supply support for ISL8023AIRTAJZ 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 acquired Intersil in 2017 and continues to support its high-performance analog and power management portfolio with full datasheet, simulation model, and evaluation board availability.

The ISL8023AIRTAJZ belongs to Renesas' ISL802x family of compact synchronous buck regulators, designed specifically for space-constrained, battery-powered applications demanding high efficiency, low quiescent current, and robust protection features.

FAQ

What is the maximum output current capability of the ISL8023AIRTAJZ?

The ISL8023AIRTAJZ delivers up to 3A of continuous output current under typical thermal conditions (θJA = 45°C/W, TA = +85°C). Peak current limit is 5.2–7.8A depending on operating conditions, and 100% duty-cycle operation sustains regulation down to very low input voltages. Derating is required above +85°C ambient or with insufficient PCB copper area.

Does the ISL8023AIRTAJZ support pre-biased output start-up?

Yes, the ISL8023AIRTAJZ supports pre-biased output start-up. During soft-start, it operates in skip mode and prevents reverse current flow into the output capacitor, avoiding voltage overshoot or damage to downstream circuitry - a critical feature for hot-swap and multi-rail sequencing applications involving the ISL8023AIRTAJZ.

How does the ISL8023AIRTAJZ handle overcurrent faults?

The ISL8023AIRTAJZ uses cycle-by-cycle peak current limiting with a 17-cycle hiccup-mode recovery. Upon detecting overcurrent, it disables the high-side FET for that cycle. After 17 consecutive faults, it shuts down and attempts auto-restart after eight soft-start intervals. This protects both the ISL8023AIRTAJZ and external components during sustained overload or short-circuit events.

Can the ISL8023AIRTAJZ be synchronized to an external clock?

Yes, the ISL8023AIRTAJZ supports external synchronization up to 4MHz via the SYNC pin. When driven with a clean CMOS clock signal, it locks its internal oscillator to the external source's positive edge, eliminating beat frequencies and enabling deterministic EMI reduction - a key advantage in noise-sensitive systems using the ISL8023AIRTAJZ.

What is the purpose of the exposed thermal pad on the ISL8023AIRTAJZ package?

The exposed pad on the ISL8023AIRTAJZ's 3×3mm TQFN package must be soldered to the SGND plane using multiple thermal vias. It reduces θJC to 6.5°C/W and significantly improves power dissipation capability - essential for maintaining junction temperature below 125°C at 3A load and ensuring long-term reliability of the ISL8023AIRTAJZ in compact layouts.