250mA LDO for noise sensitive designs

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By Nick Flaherty

Diodes has launched a low dropout LDO regulator with a high power supply rejection ratio (PSRR) in a small package for voltage regulation in noise sensitive battery-operated devices.

The AP7353 is available in X1-WLB0707-4 (Type A1) and X2-DFN1010-4 (Type B) packages, each measuring less than 1mm on each side to fit into designs of wearables, portables and connected sensors in the INternt of Things (IoT). The LDO provides regulation up to 4.5V at 250mA with an enable pin to put the device into a standby mode.

A PSRR of 90dB at 1kHz and low quiescent current of 18μA make the AP7353 suitable for battery-powered devices that include noise sensitive analogue circuits or RF interfaces. The AP7353’s high PSRR and its 10µV wideband noise voltage help support a high signal-to-noise ratio. 

The AP7353’s enable pin allows the LDO regulator to be put into standby mode when not required. For improved robustness, short-circuit and overtemperature protection are also included. An AP7353D version is available that discharges the output when disabled.

THe LDO has a wide input voltage range between 2.0V and 5.5V with a fixed output voltage of between 1.8V and 4.5V with an accuracy of ±1 per cent and line regulation of 0.001%/mA when supplying an output current from 1mA to 250mA.

The AP7353 is available now, priced at $0.096 each in 10,000 piece quantities.

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