1.5-MHz Voltage Regulator Offers Programmable Output-Current Limit

The LT3663 1.2-A, 1.5-MHz monolithic current mode step-down switching regulator features a programmable output current limit. Its wide operating input voltage of 7.5 V to 36 V makes the device ideal for a variety of input sources, including unregulated 12-V wall adapters, 24-V industrial supplies, and automotive applications. Onboard input overvoltage lockout protects the device through input transients as high as 60 V, such as those commonly found in automotive applications. Both the LT3663’s output voltage and output current are adjustable. Output voltages as low as 0.8 V are set by a resistor divider, while its output current is user programmable between 0.4 A to 1.2 A via an external resistor. The LT3663 utilizes a 1.5-MHz oscillator, internal compensation, and an internal boost diode to minimize the overall solution footprint. It comes housed in a 2-mm x 3mm DFN package. Pricing for the LT3663EDCB starts at $2.50 in 1000-piece quantities. The LT3663IDCB is tested and guaranteed to operate from a -40ºC to +125ºC operating junction temperature, and is priced at $2.94 in 1000-piece quantities. All versions are available from stock. LINEAR TECHNOLOGY CORP., Milpitas, CA. (408) 432-1900.