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A current-mode buck-boost DC-DC converter with fast transient response

  • A fast transient current-mode buckboost DC-DC converter for portable devices is presented. Running at 1 MHz the converter provides stable 3 V from a 2.7 V to 4.2 V Li-Ion battery. A small voltage under-/overshoot is achieved by fast transient techniques: (1) adaptive pulse skipping (APS) and (2) adaptive compensation capacitance (ACC). The proposed converter was implemented in a 0.25 μm CMOS technology. Load transient simulations confirm the effectiveness of APS and ACC. The improvement in voltage undershoot and response time at light-to-heavy load step (100 mA to 500 mA), are 17 % and 59 %, respectively, in boost mode and 40 % and 49 %, respectively, in buck mode. Similar results are achieved at heavy-to-light load step for overshoot and response time.

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Author of HS ReutlingenEhrhart, Andreas; Wicht, Bernhard
Erschienen in:MPC / Multi-Projekt-Chip-Gruppe Baden-Württemberg : Tagungsband zum Workshop der Multiprojekt-Chip-Gruppe Baden-Württemberg : Workshop Februar 2013, Mannheim
Publisher:Hochschule Ulm
Place of publication:Ulm
Editor:Gerhard Forster
Document Type:Conference proceeding
Publication year:2013
Tag:DC-DC converter; adaptive compensation capacitance; adaptive pulse skipping; buck-boost converter; fast transient
Page Number:6
First Page:17
Last Page:22
DDC classes:620 Ingenieurwissenschaften und Maschinenbau
Open access?:Ja
Licence (German):License Logo  Open Access