Dual synchronous buck regulators deliver 95% peak efficiency
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Intersil has expanded its range of dual output integrated FET buck regulators, with three new devices it says provide up to 95% power conversion efficiency.
According to Intersil, the ISL8022, ISL8033/A and ISL8036/A have quiescent currents as low as 40uA and support an input voltage range of 2.85 to 6V. This makes it suitable for single Li+ cell, three NiMH cell or 3V/5V dc input voltage applications.
The ISL8033/A and ISL8036/A are dual output step down dc/dc regulators designed to deliver up to 3A continuous output current per channel. The ISL8022 provides similar functionality for lower current applications, delivering up to 2A/1.7A continuous output current on its two channels. All the devices feature a peak current mode, fixed frequency control architecture, while the load transient response is designed to reduce required output capacitance.
The ISL8033 and ISL8036 offer a fixed switching frequency of 1MHz, while the ISL8033A and ISL8036A switch at 2.5MHz to reduce the overall dc/dc converter size. The ISL8033 and ISL8036 can also be synchronized to an external clock of up to 6MHz.
In addition to sourcing 3A independently, both channels in the ISL8036/A can be paralleled to create a single 6A output in current sharing mode for higher power applications.
