LDOs with transient performance for sensitive loads

LDOs with transient performance for sensitive loads

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By eeNews Europe

The ISL80510’s maximum dropout is nearly 50% lower than the nearest competitor, which enables lower power dissipation in industrial, wired and wireless equipment. These claim better transient performance with peak-to-peak excursions up to nine times lower than competitive LDOs. This transient performance level and DC accuracy of 1.8% safeguards against voltage undershoots and overshoots to deliver clean point-of-load voltage to CPUs, DSPs and MCUs, which require tight voltage accuracy and low noise. The ISL80510/05’s compensation loop provides a high level of noise filtering by maintaining a flat power supply rejection ratio (PSRR) response over a wide range of frequencies.

The ISL80510 operates from input voltages of 2.2V to 6V, and the ISL80505 supports 1.8V to 6V. The output voltage of these LDOs can be adjusted from 0.8V to 5.5V, which enables designers to cover a broad range of applications including low power RF amplifiers, communications equipment, industrial process control systems, test instruments, medical equipment, and consumer network routers. An adjustable soft-start feature allows designers to control the input inrush current and program the startup time to accommodate any power-up sequencing requirement.

The parts are priced at $0.39 (1000). Both LDOs are pin-to-pin compatible and supplied in thermally enhanced 8-lead, 3 x 3mm DFN packages. The ISL80510EVAL1Z evaluation board is priced at $20.

Intersil; /

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Features and Specifications of ISL80510 and ISL80505

· ISL80510 single-output LDO voltage regulator enables best-in-class dropout of 130 mV at Vout of 2.5V with a 1A load current

· ISL80505 single-output LDO voltage regulator enables ultra-low dropout of 45 mV at Vout of 2.5V with a 500 mA load current

· Stable operation with a small 4.7µF output ceramic capacitor

· Delivers ±1.8% Vout accuracy guaranteed over line, load and junction temperature range of -40°C to +125°C

· Programmable output soft-start supports sequencing and helps power supply designer control inrush current

· Current limit protection and thermal shutdown function safeguards against excessive load current or operating temperature

The ISL80510 and ISL80505 LDOs can be combined with the ISL80136 40V/50 mA linear regulator, ISL80138 40V/150 mA linear regulator, and synchronous step-down DC/DC converters, such as the ISL8117A and ISL8026, to support the bulk power rails in a typical process control industrial application.

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