A transient output-current regulator (TOCR) is presented and merged into a buck converter to achieve fast load-transient response for stepwise load-current I load profiles, leading to small undershoot/overshoot voltage V US/VOS and short settling time t_S in the output voltage VO. The TOCR instantly detects an Iload transient and triggers a compensation current IU/ID. Moreover, background calibration of the IU/ID is proposed to ensure the sum of inductor current IL and IU/ID accurately tracks Iload under PVT variations. The prototype chip, fabricated in a 0.18-μ m CMOS process, occupies 1.88 mm2. Under 0.45-A and 1-A Iload transients, the measured VO remains within 1% of its nominal 1.8 V, with VUS and VOS both being less than 18 mV and a negligible tS. Compared with other state of the arts, this letter achieves the fastest load-transient response with the smallest VUS/VOS and shortest tS.
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering