Low noise step-down regulator

24 August 2005 Power Electronics / Power Management

Linear Technology's LTC3448 is a high efficiency, 2,25 MHz (or 1,5 MHz) synchronous buck regulator IC that can deliver up to 600 mA of continuous output current. It operates in two modes; first, when output current is greater than 3 mA, it switches at a constant frequency of 2,25 MHz. If output current drops to 3 mA or below, it automatically transitions into a very low noise LDO mode, consuming only 32 μA. Output ripple is less than 5 mV p-p in switching mode and is low noise in LDO mode, making it ideal for low noise applications such as handheld wireless applications. It operates from 2,5 V to 5,5 V, and can generate output voltages as low as 0,6 V for the latest generation of low voltage DSPs and microcontrollers. The user can set the LTC3448's switching frequency to either 1,5 MHz or 2,25 MHz and can synchronise the device up to 4 MHz allowing very small ceramic capacitors and inductors to be used. The LTC3448 uses internal synchronous switches with an RDS(ON) of only 0,35 Ω and 0,40 Ω.

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