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An ultra-low-quiescent-current dual-mode digitally-controlled buck converter IC for cellular phone applications

Record Type:	Electronic resources : Monograph/item
Title/Author:	An ultra-low-quiescent-current dual-mode digitally-controlled buck converter IC for cellular phone applications
Author:	Xiao, Jinwen.
Description:	121 p.
Notes:	Chair: Seth R. Sanders.
Notes:	Source: Dissertation Abstracts International, Volume: 65-02, Section: B, page: 0949.
Contained By:	Dissertation Abstracts International65-02B.
Subject:	Engineering, Electronics and Electrical.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3121762
ISBN:	0496691139

An ultra-low-quiescent-current dual-mode digitally-controlled buck converter IC for cellular phone applications
Xiao, Jinwen.

An ultra-low-quiescent-current dual-mode digitally-controlled buck converter IC for cellular phone applications [electronic resource] - 121 p.

Chair: Seth R. Sanders.

Thesis (Ph.D.)--University of California, Berkeley, 2003.

This dissertation presents a low-quiescent-current dual-mode digitally-controlled buck converter IC for cellular phone applications. In cellular phones, the load current demanded by the on-board circuitry varies from below 0.1 mA up to a few hundred mA, reflecting operation in standby and active (talk) modes. Thus, high efficiency over a wide load range is of high priority for power management units, since the total energy is limited by the capacity of a single cell Li-ion battery. A dual-mode buck converter IC, implemented with a 0.25-mum CMOS process, takes 2 mm2 active area and demonstrates equal or better regulation performance compared to state-of-the-art analog switchers. A very low quiescent current of 4 muA is achieved experimentally, resulting in a more than three-fold reduction compared to the leading state-of-the-art analog controllers. Consequently, a high efficiency, exceeding 70%, is achieved over a wide load range between 0.1 and 400 mA.

ISBN: 0496691139Subjects--Topical Terms:

226981
Engineering, Electronics and Electrical.

An ultra-low-quiescent-current dual-mode digitally-controlled buck converter IC for cellular phone applications
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502 $a Thesis (Ph.D.)--University of California, Berkeley, 2003.
520 # $a This dissertation presents a low-quiescent-current dual-mode digitally-controlled buck converter IC for cellular phone applications. In cellular phones, the load current demanded by the on-board circuitry varies from below 0.1 mA up to a few hundred mA, reflecting operation in standby and active (talk) modes. Thus, high efficiency over a wide load range is of high priority for power management units, since the total energy is limited by the capacity of a single cell Li-ion battery. A dual-mode buck converter IC, implemented with a 0.25-mum CMOS process, takes 2 mm2 active area and demonstrates equal or better regulation performance compared to state-of-the-art analog switchers. A very low quiescent current of 4 muA is achieved experimentally, resulting in a more than three-fold reduction compared to the leading state-of-the-art analog controllers. Consequently, a high efficiency, exceeding 70%, is achieved over a wide load range between 0.1 and 400 mA.
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