Low-Dropout Regulator ICs – in surface-mount package

The SI-3000KM , available from Allegro MicroSystems , is a low-dropout (LDO) voltage regulator IC in the TO-252 surface-mount package. The device is available in low-voltage (SI-3012KM ) and high-voltage (SI-3010KM ) versions.

The SI-3012KM offers fixed outputs of 1.8, 2.5 and 3.3 V plus an adjustable output, while the SI-3010KM has 5, 9, 12 and 15 V fixed outputs plus an adjustable output. Output voltage is maintained to within (2%, and the dropout voltage is less than 0.5 V at an output current of 1 A. The circuit current when the device is in the 'off' state is less than 1&#181A.

Ripple rejection ratio is 55 dB for the low-voltage devices and 75 dB for the high-voltage units. Other features include an active-high enable function and built-in overcurrent and thermal protection. The SI-3010KM also has an input overvoltage protection circuit.

Allegro MicroSystems Europe Ltd , Walton-on-Thames, Surrey KT12 2TD, UK.

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