TY - GEN
T1 - A digitally controlled DC-DC buck converter with lossless load-current sensing and BIST functionality
AU - Liu, Tao
AU - Yeom, Hyunsoo
AU - Vermeire, Bert
AU - Adell, Philippe
AU - Bakkaloglu, Bertan
PY - 2011
Y1 - 2011
N2 - Lossless load current sensing ability is one of the most desirable features of contemporary current- or voltage-mode-controlled DC-DC converters. Current sensing can be used for short circuit detection, multi-stage converter load balancing, thermal control, and load-independent control of DC-DC converters [1]. Recently, current sensing techniques using the existing inductor series DC resistance (DCR) are gaining attention due to their reduced complexity and minimized loss [2][4]. These techniques increase the need for inductor build-in self-test (BIST) ability to measure DCR. Inductor BIST is also critical for high-reliability applications such as automotive and aerospace systems where component variation and drift need to be closely monitored. An analog inductor characterization and current sensing technique utilizing Gm-C filtering is proposed in [2], where the gain errors and sensing offset are cancelled in analog domain. The DC-DC buck converter presented here uses an offset-independent inductor characterization enabling a digital continuous lossless load-current-sensing scheme. The proposed inductor BIST and current-sensing techniques can be extended to current-mode-controlled converters and multi-stage parallel converters as well.
AB - Lossless load current sensing ability is one of the most desirable features of contemporary current- or voltage-mode-controlled DC-DC converters. Current sensing can be used for short circuit detection, multi-stage converter load balancing, thermal control, and load-independent control of DC-DC converters [1]. Recently, current sensing techniques using the existing inductor series DC resistance (DCR) are gaining attention due to their reduced complexity and minimized loss [2][4]. These techniques increase the need for inductor build-in self-test (BIST) ability to measure DCR. Inductor BIST is also critical for high-reliability applications such as automotive and aerospace systems where component variation and drift need to be closely monitored. An analog inductor characterization and current sensing technique utilizing Gm-C filtering is proposed in [2], where the gain errors and sensing offset are cancelled in analog domain. The DC-DC buck converter presented here uses an offset-independent inductor characterization enabling a digital continuous lossless load-current-sensing scheme. The proposed inductor BIST and current-sensing techniques can be extended to current-mode-controlled converters and multi-stage parallel converters as well.
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U2 - 10.1109/ISSCC.2011.5746288
DO - 10.1109/ISSCC.2011.5746288
M3 - Conference contribution
AN - SCOPUS:79955730029
SN - 9781612843001
T3 - Digest of Technical Papers - IEEE International Solid-State Circuits Conference
SP - 388
EP - 389
BT - 2011 IEEE International Solid-State Circuits Conference - Digest of Technical Papers, ISSCC 2011
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2011 IEEE International Solid-State Circuits Conference, ISSCC 2011
Y2 - 20 February 2011 through 24 February 2011
ER -