LDO regulators for sensitive loads

Two new high performance, single output low-dropout (LDO) voltage regulators were announced by Intersil Corporation. The voltage regulators provide best-in-class transient performance for noise sensitive loads. The devices, ISL80510 and ISL80505, can deliver 1 A and 0.5 A of continuous output current and an ultra-low dropout of 130 mV and 45 mV at full load. The maximum dropout enables lower power dissipation in industrial, wired, and wireless equipment.  

Intersil's ISL80510/05 LDOs also provide 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 excellent 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.  

“We increasingly see a broad range of applications that need a cost-effective, yet high performance LDO solution to address noise sensitive loads,” said Mark Downing, senior vice president of Infrastructure and Industrial Power Products at Intersil. “The pin-compatible ISL80510 and ISL80505 easily satisfy this requirement with best-in-class dropout and transient response, and programmable soft-start features at the right price point.” 

Features

• ISL80510 single-output LDO voltage regulator enables best-in-class dropout of 130 mV at Vout of 2.5 V with a 1 A load current
• ISL80505 single-output LDO voltage regulator enables ultra-low dropout of 45 mV at Vout of 2.5 V with a 500 mA load current
• Stable operation with a small 4.7 μF 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