Transcription of The Low Dropout Regulator
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The Low Dropout Regulator
8 SPRING 2019 IEEE SOLID-STATE CIRCUITS MAGAZINE A CIRCUIT FOR ALL SEASONSB ehzad RazaviTThe low- Dropout (LDO) Regulator is an essential power management circuit in today s systems on chip (SOCs). Much to grammarians chagrin, the noun Regulator has been dropped, and the circuit is simply called the LDO. The need for supply voltage regula-tion, of course, goes back many de-cades. Shown in Figure 1 is an example from 1969 that incorporates a pnp transistor at 28 and a feedback loop to stabilize the output voltage at 27 [1]. Similar concepts were previously implemented using vacuum tubes [2], but it was the availability of both p- and n-type semiconductor devices that paved the way for a low-voltage drop from the input to the emphasis on a low-voltage Dropout began to emerge in the 1980s in automotive electronics, as micropro-cessors found their way into vehicles.
ence generator provides a low-noise Digital Object Identifier 10.1109/MSSC.2019.2910952 Date of publication: 24 June 2019 The Low Dropout Regulator From Battery Circuit Voltage Supply 26 28 30 14 27 40 42 38 32 52 46 48 56 54 44 50 16 34 36 …
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