资料介绍
Bipolar low dropout regulators (LDOs) have become
common place in a variety of portable applications,
such as cell phones, pagers and PDAs. Their
popularity stems from small packaging, high output
current capability and precision output voltage
specifications. However, the bipolar process
technology from which these devices are fabricated
brings inherent disadvantages, such as excessive
supply current. This application note outlines the
advantages of small geometry CMOS LDOs over
bipolar LDOs and provides comparative test data of
key regulator specifications for a popular
pin-compatible bipolar LDO over Microchip’s CMOS
LDOs. M AN766
Pin-Compatible CMOS Upgrades to Bipolar LDOs
Author: Don Alfano, Danny Alred, SUPPLY CURRENT:
Abid Hussain and Paul Paglia, CMOS VS. BIPOLAR
Microchip Technology Inc.
Figure 1(A) and Figure 1(B) compare the block dia-
gram for a common bipolar regulator with that of an
INTRODUCTION equivalent regulator fabricated in CMOS. The supply
current to the bipolar device is co
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