Renesas ISL80510IRAJZ-T

Overview

ISL80510IRAJZ-T from Renesas Electronics (formerly Intersil) is a high-performance 1A low-dropout linear regulator with ±1.8% output voltage accuracy over -40°C to +125°C, 130mV dropout at 1A/2.5V, and programmable 0.8V–5.5V output via external resistor divider. It delivers stable power for noise-sensitive analog rails in post-regulation and industrial embedded systems.

For engineers reviewing the ISL80510IRAJZ-T datasheet, ISL80510IRAJZ-T pinout, ISL80510IRAJZ-T application, or ISL80510IRAJZ-T equivalent, key selection criteria include guaranteed thermal shutdown at 160°C, soft-start control via external capacitor, ENABLE-compatible shutdown mode (<12µA quiescent), PSRR >48dB at 1kHz, and stability with only 4.7µF ceramic output capacitance.

Technical Context

The ISL80510IRAJZ-T employs a submicron BiCMOS process to achieve low quiescent current (2.2–5.7mA across load) and fast transient response. Its internal compensation architecture eliminates need for external phase-boost components in most configurations while maintaining stability with 4.7µF–100µF X5R/X7R ceramic capacitors.

It integrates precision bandgap reference (500mV FB voltage), current-limit protection (1.35–2.15A), thermal shutdown with 30°C hysteresis, and VIN-independent ENABLE logic compatible with TTL/CMOS levels. The SS pin controls ramp rate via 2µA internal charge current and discharge path.

Key Specifications

Pinout & Package

ISL80510IRAJZ-T is housed in an 8-lead 3mm × 3mm DFN package (L8.3x3J) 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 TPL7407LPWPR and MCP1703T-3302E/MB, the ISL80510IRAJZ-T uniquely combines 1A output, adjustable 0.8–5.5V regulation, ENABLE/SS control, and ±1.8% accuracy - making it the only option among the three qualified for demanding post-regulation and industrial embedded applications requiring both performance and configurability.

Availability

ISL80510IRAJZ-T is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure equipment, and medical instrumentation requiring stable component supply with full RoHS compliance and extended temperature support (-40°C to +125°C).

Supply support for ISL80510IRAJZ-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 is a global leader in microcontrollers, analog power, and SoC solutions, delivering high-reliability semiconductor products for automotive, industrial, and enterprise applications.

The ISL80510IRAJZ-T belongs to Renesas' high-performance LDO family designed specifically for noise-critical post-regulation in mixed-signal systems, emphasizing PSRR, accuracy, and thermal robustness over broad temperature ranges.

FAQ

What is the minimum output capacitor required for stable operation of the ISL80510IRAJZ-T?

The ISL80510IRAJZ-T requires a minimum 4.7µF X5R or X7R ceramic capacitor on the VOUT pin, placed within 0.5cm of the VOUT and GND pins. This value is guaranteed for stability across full temperature (-40°C to +125°C), input voltage (2.2V–6V), and load (0–1A) ranges per the datasheet. Larger values (e.g., 10µF or 100µF) improve PSRR and transient response but are not required for basic stability. The ISL80510IRAJZ-T's internal compensation eliminates need for ESR-based damping networks.

Does the ISL80510IRAJZ-T support adjustable output voltage, and how is it configured?

Yes, the ISL80510IRAJZ-T supports programmable output voltage from 0.8V to 5.5V using an external resistor divider connected to the FB pin. The feedback reference voltage is precisely 500mV, so R1 and R2 are calculated using VOUT = 0.5 × (1 + R1/R2). For example, a 1.8V output uses R1 = 2.61kΩ and R2 = 1kΩ. The ISL80510IRAJZ-T does not include internal resistors - all output voltage setting is external and fully configurable.

What is the purpose of the SS pin on the ISL80510IRAJZ-T, and how is it used?

The SS (Soft-Start) pin on the ISL80510IRAJZ-T controls the output voltage ramp rate during power-up or ENABLE assertion. An external capacitor (CSS) from SS to GND sets the start-up time via a 2µA internal current source: tSTART ≈ CSS × 0.5 / 2µA. This limits inrush current into large output capacitors and prevents system resets. During shutdown, the SS pin discharges CSS through an internal 1mA pull-down, ensuring controlled turn-off. No external driver is needed - the ISL80510IRAJZ-T manages all timing internally.

How does the ENABLE function operate on the ISL80510IRAJZ-T, and what are its voltage thresholds?

The ENABLE pin on the ISL80510IRAJZ-T is VIN-independent and TTL/CMOS-compatible. It turns the device on when voltage exceeds ~0.8V (typical) with 80mV hysteresis, and off when voltage falls below ~0.72V. In shutdown, quiescent current drops to <12µA (max). The pin must not float - if unused, tie to VIN via 1kΩ–10kΩ resistor. ENABLE asserts within 100µs (typical) after crossing threshold, and the ISL80510IRAJZ-T enters full regulation after soft-start completes.

What thermal considerations apply to the ISL80510IRAJZ-T in high-power applications?

The ISL80510IRAJZ-T uses an 8-lead 3×3mm DFN with exposed EPAD that must be soldered to a PCB ground plane using ≥4 thermal vias for effective heat dissipation. With θJA = 48°C/W, power dissipation PD = (VIN – VOUT) × IOUT + VIN × I_GND must stay below PD_MAX = (T_J(MAX) – T_A) / θJA. At 125°C max ambient and 150°C junction limit, max allowable PD is ~520mW. For 1A at 2.5V out from 5V in, PD ≈ 2.5W - requiring substantial copper area or forced air. Thermal shutdown activates at 160°C with 30°C hysteresis.