Dual-mode, high-efficiency dc-dc converter useful for portable b

Details Dual-mode, high-efficiency dc-dc converter useful for portable b Dual-mode, high-efficiency dc-dc converter useful for portable b

1995-11-06

1998-06-30

Nguyen, Matthew V.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

G06F 156

Patent

active

057739668

ABSTRACT:
A dual-mode dc--dc converter is configured for operation at high efficiencies over a wide load range. At light loads and during equipment sleep mode, a dc--dc converter is operated in a linear regulation mode; at heavy loads, the dc--dc converter is operated in a switching mode. In this way, efficiency is maximized over a wide load range, and for portable battery-operated equipment, for example, battery operating time is extended. The linear regulation mode avoids any switching losses which can far exceed the low output power at light loads, including equipment sleep mode. To further extend battery life, synchronous rectification is used during the switching mode, and low drop-out regulation is used during the linear regulation mode over the entire battery voltage range and load range. During the switching mode, the converter is synchronized to the system clock in order to minimize interference. Advantageously, a converter according to the present invention is useful for low-noise portable equipment such as, for example, cellular phones.

REFERENCES:
patent: 3769568 (1973-10-01), Hamilton et al.
patent: 5546294 (1996-08-01), Schutten et al.
patent: 5548206 (1996-08-01), Soo

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