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SWITCHED-MODE TECHNIQUES
Session Chair: Francesco Rezzi, Marvell Semiconductor, Pavia, Italy
Associate Chair: Philip K.T. Mok, Hong Kong University of Science and Technology,
Hong Kong, China
26.1 Multiple-Output Step-Up/Down Switching DC-DC Converter with Vestigial Current
Control
1 1 1 2 2 3
K-S. Seol , Y-J. Woo , G-H. Cho , G-H. Cho , J-W. Lee , S-I. Kim
1KAIST, Daejeon, Korea
2JDA Technology, Daejeon, Korea
3 LG Electronics, Kyunggi, Korea
1:30 PM
A single-chip multiple-output DC-DC converter that uses vestigial-current-control method
is implemented in 0.5μm BiCMOS occupying 3.6mm 2 . It consists of 3 step-up/down
outputs, 2 step-up outputs, and 1 auxiliary output, and operates stably under wide load
variation with simple control loop compensation. The measured efficiency is higher than
83% while delivering load power of 1.5W.
26.2 Single-Inductor Dual-Input Dual-Output Buck-Boost Fuel-Cell-Li-Ion Charging
DC-DC Converter Supply
S. Kim, G. A. Rincon-Mora
Georgia Institute of Technology, Atlanta, GA
SESSION 26
2:00 PM
A micro fuel cell energizes a wireless microsensor for extended operation time while a
Li-ion microscale battery provides peak transmission power. A 1V±25mV 2MHz
single-inductor fuel-cell-Li-ion charger-supply CMOS IC capable of supplying 1mA and
adjusting to 0.1-to-1mA load dumps within 30μs (with output regulation of ±50mV during
mode transitions) is presented.
26.3 Digitally Assisted Quasi-V2 Hysteretic Buck Converter with Fixed Frequency and
without Using Large-ESR Capacitor
2:30 PM
F. Su, W-H. Ki
Hong Kong University of Science and Technology, Hong Kong, China
A quasi-V2 hysteretic buck converter in 0.35μm CMOS senses the inductor current ripple
through an on-chip RC filter across the inductor, relaxing the need for an output capacitor
with large ESR. A digital adaptive delay compensator is used to fix the switching frequency
at 3MHz, with 3.3% variation across the overall operating range. The output capacitor is
4.4μF with ESR below 30mΩ. At Vo=0.9V, the load transient recovery time is 2.4μs for a
50 to 500mA step, and is 2.8μs for a 500 to 50mA step. The overshoot and undershoot
voltages are 38mV and 45mV, respectively.
Break 3:00 PM
72