Power Electronics / Power Management


Tiny step-down switching regulators

25 June 2008 Power Electronics / Power Management

National Semiconductor has developed two new step-down switching regulators well-suited for handheld devices and automotive power adapters. The highly integrated LM34917A and LM34919 are non-synchronous buck regulators featuring a supply voltage rating up to 50 V, 1,25 A continuous output current, intelligent current limiting and over-voltage protection. Both devices feature programmable switching frequency up to 2 MHz and integrate MOSFET switches to reduce system component count. They utilise a constant on-time (COT) control scheme, which requires no loop compensation. The regulators are well-suited for use in applications that require high-input voltage regulations such as MP3 players utilising Firewire connectivity (IEEE1394) as well as MP3 players or auxiliary power adapters with direct connection to a 12 V (universal) automotive power outlet where transient protection requirements can exceed 40 V.



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