Buck the output trend

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Linear Technology Corporation

has released the LTC3448, a 2.25 MHz (or 1.5MHz) synchronous buck regulator which can deliver up to 600mA of continuous output current.

It operates in two modes; first, when output current is greater than 3mA, it switches at a constant frequency of 2.25MHz. If output current drops to 3mA or below, it automatically transitions into a very low noise LDO mode consuming 32uA of quiescent current.

Linear says that output ripple is less than 5mV(P-P) in switching mode and is low noise in LDO mode, making it ideal for low noise applications such as handheld wireless applications.

Using a current mode architecture, the LTC3448 operates from an input voltage range of 2.5V to 5.5V, making it ideal for single cell Li-Ion, multi-cell Alkaline or NiMH applications. It can reportedly generate output voltages as low as 0.6V, enabling it to power the latest generation of low voltage DSPs and microcontrollers.

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