The SI-3000KD is a series regulator IC using a hypo saturation type PNP bipolar transistor in the power section and it can be used with the low difference of input/output voltages.
It is provided with an ON/OFF terminal which operates in Active High mode and the current consumption of circuits at OFF time is zero.
Two product groups are available. One is a product group which can use a ceramic capacitor for the output capacitor at the voltage of 17V (SI-3012KD, SI-3033KD) and another is a group which can use an electrolytic capacitor for the output capacitor at the high voltage (35V) (SI-3010KD, SI-3050KD).

Design Support

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■Application Note

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    ・Compact surface-mount package(TO263-5)
    ・Output current: 1.0A
    ・Low dropout voltage VDIF≦0.6V(at IO=1.0A)
    ・Low circuit current consumption Iq≦350μA
    ・Low circuit at output OFF: Iq(OFF)≦1μA
    ・Built-in overcurrent and thermal protection circuits
    ・Compatible with low ESR capacitor


    ・Secondary stabilized power supply (local power supply)


Output Voltage 3.3 V
Output Current 1.00 A
Input Voltage 17.00 V
Dropout Voltage 0.4 V
Output Method Fixed
Output On / Off YES
Low ESR Capacitor Support YES
Overcurrent Protection Drooping Type

Block Diagram

Block Diagram

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