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A Low-Voltage, Low Quiescent Current,Low Drop-Out Regulator
Gabriel A. Rincon-Mora, Member, IEEE, and Phillip E. Allen, Fellow, IEEE
Abstract—The demand for low-voltage, low drop-out (LDO)
regulators is increasing because of the growing demand for
portable electronics, i.e., cellular phones, pagers, laptops, etc.
LDO’s are used coherently with dc-dc converters as well as
standalone parts. In power supply systems, they are typically
cascaded onto switching regulators to suppress noise and provide
a low noise output. The need for low voltage is innate to portable
low power devices and corroborated by lower breakdown voltages
resulting from reductions in feature size. Low quiescent current in
a battery-operated system is an intrinsic performance parameter
because it partially determines battery life. This paper discusses
some techniques that enable the practical realizations of low quiescent
current LDO’s at low voltages and in existing technologies.
The proposed circuit exploits the frequency response dependence
on load-current to minimize quiescent current flow. Moreover,
the output current capabilities of MOS power transistors are
enhanced and drop-out voltages are decreased for a given device
size. Other applications, like dc-dc converters, can also reap
the benefits of these enhanced MOS devices. An LDO prototype
incorporating the aforementioned techniques was fabricated. The
circuit was operable down to input voltages of 1 V with a zeroload
quiescent current flow of 23 A. Moreover, the regulator
provided 18 and 50 mA of output current at input voltages of 1
and 1.2 V, respectively.
Index Terms— Low drop-out, low-voltage regulators, power
supply circuits, regulators.
[ 本帖最后由 semico_ljj 于 2006-11-9 20:03 编辑 ] |
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发表于 2006-11-9 20:00:58
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