Automotive LDO regulator has high PSRR and low quiescent current

October 10, 2019 //By Nick Flaherty
Diodes' AP7315Q and AP7343Q low drop out (LDO) linear regulators deliver 150mA and 300mA
Diodes' AP7315Q and AP7343Q low drop out (LDO) linear regulators deliver 150mA and 300mA

Diodes has launched its first low-dropout (LDO) linear regulators compliant to the automotive AEC-Q100 Grade 1 standard.

The AP7315Q and AP7343Q deliver 150mA and 300mA respectively and are suitable for any automotive application that requires tight voltage regulation across operating conditions, such as point-of-load power supplies in advanced driver assist systems (ADAS), RF communications, infotainment systems, and cameras.

Automotive manufacturers are integrating an increasing level of ADAS into vehicles with sensors and other sensitive circuits that demand highly stable power supplies. With full production part approval process (PPAP) capability, the AP7315Q and AP7343Q linear regulators can be used in automotive applications that require product qualified to AEC-Q100 with a Grade 1 (-40°C to +125°C) temperature rating.

The AP7315Q and AP7343Q LDO regulators provide practical alternatives to switching regulators in highly demanding automotive applications. As well as current limiting and short-circuit protection, the LDOs feature an enable input that allows the linear regulators to be switched off when not required. While in use, the regulators have a low quiescent current of 35μA. Both devices are also available with (AP7315DQ/43DQ) and without (AP7315Q/43Q), an output capacitor discharge feature, which is often required to protect sensitive loads during shutdown, such as CMOS image sensors.

Both LSO regulators are supplied in the SOT25 package. The AP7315Q/DQ parts are priced at $0.09 each and the AP7343Q/DQ at $0.14 each in 1000 piece quantities.

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