National Semiconductor Introduces Industry’s Smallest Step-Down Switching Regulators for Handheld Devices and Automotive Power Adapters

National Semiconductor Introduces Industry's Smallest Step-Down Switching Regulators for Handheld Devices and Automotive Power Adapters

National Semiconductor Corp. has announced two new step-down switching regulators well-suited for handheld devices and automotive power adapters.  The highly integrated LM34917A and LM34919, members of National’s PowerWise® energy-efficient product family, are the industry’s smallest non-synchronous buck regulators to feature a supply voltage rating up to 50V, 1.25A continuous output current, intelligent current limiting and over-voltage protection.

PowerWise Buck Regulators Supply up to 1.2A and Feature Intelligent Current Limiting and Over-Voltage Protection

National’s new LM34917A and LM34919 feature programmable switching frequency up to 2 MHz.  The products integrate MOSFET switches to reduce system component count, and a high switching frequency enables use of ultra-small inductors and capacitors for very small solution size.

The LM34917A and LM34919 utilize 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 utilizing Firewire connectivity (IEEE1394) as well as MP3 players or auxiliary power adapters with direct connection to a 12V (universal) automotive power outlet where transient protection requirements can exceed 40V.