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A current sensing circuit using current-voltage conversion for PMOS-based LDO regulators

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4 Author(s)
Ho Quang Tay ; IC Design Res. & Educ. Center (ICDREC), Vietnam Nat. Univ.-Hochiminh City, Ho Chi Minh City, Vietnam ; Vo Tuan Nam ; Nguyen Hoang Duc ; Bui Ngoc Chau

In this paper, a standalone output current sensing module for CMOS low dropout linear voltage (LDO) regulator with PMOS as pass device is proposed. The main purpose of current sensing is to create an over-current protection or to limit the output current value in certain applications. Based on I-V conversion in which the supply voltage varies from 2.7 V-4.2 V, the current clamp value varies from 178 mA to 270 mA in the case of 200 mA load limiting. The proposal has been successfully fabricated using a CMOS technology, and verified through the correct operation of a power management prototype chip.

Published in:

Computer Applications and Industrial Electronics (ISCAIE), 2012 IEEE Symposium on

Date of Conference:

3-4 Dec. 2012