LDOs with transient performance for sensitive loads

October 06, 2015 // By Graham Prophet
ISL80510 and ISL80505 are high performance, single output low-dropout (LDO) voltage regulators that optimise dropout and transient performance for noise sensitive loads, delivering 1A and 0.5A of continuous output current and ultra-low dropout of 130 mV and 45 mV at full load, respectively.

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; www.intersil.com/products/isl80510 / www.intersil.com/products/isl80505

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