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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Min Kyu Song Sankman, J. Dongsheng Ma |
| Copyright Year | 2014 |
| Description | Author affiliation: Univ. of Texas at Dallas, Richardson, TX, USA (Min Kyu Song; Sankman, J.; Dongsheng Ma) |
| Abstract | In recent years, the clock frequency, the number of cores, and the power dissipation of application processors (APs) for portable electronics have dramatically increased. As a result, peak processor currents have reached several amperes with slew rates on the order of 1A/ns. These fast large steps incur large output voltage $(V_{OUT})$ droops, which induce failed paths and cause processor black-outs. Present voltage regulators (VRs) combat these challenges by using bulky output capacitor $(C_{OUT})$ arrays that could add up to over 100μF. However, this practice is untenable for next-generation APs, which have severely limited PCB area and require fast dynamic voltage scaling. These challenges have led to great demand for ultra-fast VRs. PWM control requires a bandwidth 5 to 10× less than the switching frequency, $f_{SW},$ which results in a slow response [1]. Hysteretic control has been proposed to achieve faster response [2, 3], however, it still suffers from an inherent delay $(t_{delay})$ up to the discharge period, (1-D)T, due to realistic hysteretic window size and inductor current $(I_{L})$ slew limit. Consider, for example, a fast hysteretic VR achieving 10% voltage droop for an instant load step of 5A. For an inductor (L) chosen to have $I_{L}$ ripple <; 200mA, and $C_{OUT}$ under a few μF, $t_{delay}$ cannot exceed a few ns. This requires a $f_{SW}$ from 0.5 to 1GHz, which in turn causes a large switching loss and restricts the feasible power level of the converter. This is against the power demand trend of APs. An interleaved multiphase topology can be the most effective way to improve both the system response and the equivalent $I_{L}$ slew rate by changing the number of phases; however, clock and phase synchronization and current sharing for conventional hysteretic control are challenging. |
| Starting Page | 80 |
| Ending Page | 81 |
| File Size | 15928652 |
| Page Count | 2 |
| File Format | |
| ISBN | 9781479909186 |
| ISSN | 01936530 |
| e-ISBN | 9781479909209 |
| DOI | 10.1109/ISSCC.2014.6757346 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2014-02-09 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Synchronization Inductors Steady-state Current measurement Program processors Voltage control Capacitors |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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