Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3448 buck regulator
Edited by the Electronicstalk Editorial
Team on 23 September 2005
Regulator ideal for handheld wireless
applications
Linear Technology has announced the LTC3448, a high efficiency, 2.25MHz (or 1.5MHz) synchronous buck regulator that can deliver up to 600mA of continuous output current.
Linear Technology has announced the LTC3448, a high efficiency, 2.25MHz (or 1.5MHz) synchronous buck regulator that can deliver up to 600mA of continuous output current It operates in two modes
This article was originally published on Electronicstalk on 3 Oct 2008 at 8.00am (UK)
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First, when the 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 only 32uA of quiescent current.
Output ripple is less than 5mV peak-peak 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 2.5 to 5.5V, making it ideal for single cell Li-ion, multicell alkaline or NiMH applications.
It can generate output voltages as low as 0.6V, enabling it to power the latest generation of low voltage DSPs and microcontrollers.
Users can set the LTC3448's switching frequency to either 1.5 or 2.25MHz and can synchronise the device up to 4MHz allowing the utilisation of tiny, low-cost ceramic capacitors and inductors less than 1.2mm in height.
Alternately, the part can be synchronised to an external clock.
The combination of tiny externals and a 3 x 3mm DFN-8 (or MSOP-8E) provide a very compact solution footprint for space conscious handheld applications.
The LTC3448 uses internal synchronous switches with an on-resistance of only 0.35 and 0.40ohm to deliver efficiencies as high as 96%.
It also uses low dropout 100% duty cycle operation to allow output voltages approaching the input voltage, further extending battery run-time.
Light load quiescent current is only 32uA and less than 1uA in shutdown ensuring maximum battery life. Request a free brochure from Linear Technology Corp ...
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