Renesas ISL80112IRAJZ-T

Overview

ISL80112IRAJZ-T from Renesas Electronics is a 2A ultra-low-dropout NMOS LDO regulator optimized for low-voltage post-regulation in data communication, computing, and medical systems. It operates with VIN from 0.7V to 3.6V, VBIAS from 2.9V to 5.5V, delivers ±1.6% output voltage accuracy over –40°C to +125°C, achieves 53mV typical dropout at 2A, and provides >40dB PSRR at 100kHz for noise-sensitive FPGA core supplies.

For engineers reviewing the ISL80112IRAJZ-T datasheet, ISL80112IRAJZ-T pinout, ISL80112IRAJZ-T application, or ISL80112IRAJZ-T equivalent, key selection considerations include its dual-supply architecture (VIN/VBIAS), adjustable 0.5V–3.3V output via external resistor divider, guaranteed thermal shutdown at 160°C, PGOOD open-drain flag with 82% VOUT threshold, and compatibility with ceramic output capacitors ≥10µF.

Technical Context

The ISL80112IRAJZ-T employs an NMOS pass transistor enabling operation down to 0.7V input while maintaining stability across wide capacitor types and values. Its separate VBIAS rail powers internal reference, error amplifier, and gate driver - decoupling control circuitry from high-current VIN path and enabling superior load transient response.

It integrates enable logic with 680mV typical turn-on threshold and 260mV hysteresis, PGOOD monitoring with 9.3% hysteresis and 71–93% falling threshold, current limiting (3.2A short-circuit current), and thermal shutdown with 20°C hysteresis. The device uses internal 100µs soft-start to limit inrush current during enable.

Key Specifications

Pinout & Package

ISL80112IRAJZ-T is housed in a RoHS-compliant 10-lead 3×3 mm DFN package with exposed thermal pad (EPAD) soldered to GND plane for optimal thermal performance (θJA = 48°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A8300RGRT and NCP1117ST50T3G, the ISL80112IRAJZ-T offers superior dropout performance at 2A, integrated PGOOD and enable with hysteresis, and guaranteed accuracy over extended temperature - making it optimal for modern low-voltage, high-reliability embedded systems requiring dual-supply flexibility.

Availability

ISL80112IRAJZ-T is available at Aetrix Electronics and suitable for data communication infrastructure, medical imaging subsystems, and industrial PLC power management requiring stable component supply across extended temperature and long production lifecycles.

Supply support for ISL80112IRAJZ-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 is a global semiconductor leader delivering microcontrollers, analog power, and connectivity solutions for automotive, industrial, and enterprise applications.

The ISL80112IRAJZ-T belongs to Renesas' ultra-low-dropout NMOS LDO family designed specifically for post-regulation in size-constrained, noise-sensitive systems operating below 2.5V - targeting FPGA, ASIC, and high-precision analog power domains.

FAQ

What is the minimum input voltage required for ISL80112IRAJZ-T to regulate properly?

The ISL80112IRAJZ-T supports a minimum VIN of 0.7V, but actual minimum depends on output voltage and load. For example, at 2A output, VIN must exceed VOUT by at least 53mV (typical dropout). With VOUT = 1.2V, VIN must be ≥1.253V. The VBIAS rail must also be ≥2.9V and ≥VIN to ensure proper gate drive and internal circuit operation.

How does the VBIAS pin function in ISL80112IRAJZ-T, and what happens if it's omitted?

The VBIAS pin powers the internal reference, error amplifier, and NMOS gate driver independently of VIN. It must be supplied with 2.9V–5.5V and must always be ≥VIN. If omitted or under-volted, the device fails to regulate - VOUT collapses, PGOOD deasserts, and internal circuits become nonfunctional. A 1µF ceramic capacitor is mandatory between VBIAS and GND.

Can ISL80112IRAJZ-T be used with a 0.5V output, and what external components are required?

Yes, ISL80112IRAJZ-T supports VOUT as low as 0.5V using the ADJ pin and external resistor divider. For 0.5V output, R4 = 500Ω and R3 = 0Ω (short) per Equation 1. A minimum 47µF output capacitor is required for VOUT < 0.8V per datasheet Table 2. Input and bias caps remain 10µF and 1µF ceramic respectively.

What is the purpose of the NC pin (Pin 8) on ISL80112IRAJZ-T, and how should it be handled on the PCB?

Pin 8 is a no-connect (NC) terminal - not internally bonded and electrically inactive. It must be left unconnected on the PCB. Do not route traces to it, apply solder mask over it, and avoid placing copper or thermal reliefs beneath it to prevent unintended coupling or mechanical stress on the package.

Does ISL80112IRAJZ-T include thermal protection, and how does it behave during fault conditions?

Yes, ISL80112IRAJZ-T includes thermal shutdown activated at +160°C (typical) with 20°C hysteresis. When triggered, the output disables and remains off until die temperature falls to ~140°C, then automatically resumes regulation. During sustained overload, the device may cycle on/off - design must ensure adequate PCB copper area and thermal vias under the EPAD to maintain θJA ≤48°C/W.