Open AccessProceedings Article
A 4-μA quiescent-current dual-mode digitally controlled buck converter IC for cellular phone applications
Jinwen Xiao,Angel V. Peterchev,Jianhui Zhang,Seth R. Sanders +3 more
- Vol. 39, Iss: 12, pp 2342-2348
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TLDR
A dual-mode digitally controlled buck converter IC for cellular phone applications employing internal power management is introduced to ensure voltage compatibility between a single-cell lithium-ion battery voltage and a low-voltage integrated circuit technology.Abstract:
This paper describes a dual-mode digitally controlled buck converter IC for cellular phone applications. An architecture employing internal power management is introduced to ensure voltage compatibility between a single-cell lithium-ion battery voltage and a low-voltage integrated circuit technology. Special purpose analog and digital interface elements are developed. These include a ring-oscillator-based A/D converter (ring-ADC), which is nearly entirely synthesizable, is robust against switching noise, and has flexible resolution control, and a very low power ring-oscillator-multiplexer-based digital pulse-width modulation (PWM) generation module (ring-MUX DPWM). The chip, which includes an output power stage rated for 400 mA, occupies an active area 2 mm 2 in 0.25-μm CMOS. Very high efficiencies are achieved over a load range of 0.1-400 mA. Measured quiescent current in PFM mode is 4 μA.read more
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