MIC4685 Datasheet | Micrel Semiconductor

Micrel 3A SPAK Super Switcher™ Buck Regulator Final General Description The MIC4685 is a high-efficiency 200k Hz stepdown (buck) switching regulator. Power conversion efficiency of above 85% is easily obtainable for a wide variety of applications. The MIC4685 achieves 3A of continuous current in the 7-lead SPAK package. The thermal performance of the SPAK allows it to replace TO-220s and TO-263s (D2 PAKs) in many applications. The SPAK saves board space with a 36% smaller footprint than TO-263. High efficiency is maintained over a wide output current range by utilizing a boost capacitor to increase the voltage available to saturate the internal power switch. As a result of this high efficiency, only the ground plane of the PCB is needed for a heat sink. The MIC4685 allows for a high degree of safety. It has a wide input voltage range of 4V to 30V (34V transient), allowing it to be used in applications where input voltage transients may be present. Built-in safety Features include over-current protection, frequency-foldback short-circuit protection, and thermal shutdown. The MIC4685 is available in an 7-lead SPAK package with a junction temperature range of - 40°C to +125°C. Features - - - - - - - - - - - - - - - - - - - Low 2mm profile SPAK package 3A continuous output current Wide 4V to 30V input voltage range (34V transient) Fixed 200k Hz PWM operation Over 85% efficiency Output voltage adjustable to 1.235V All surface mount solution Internally pensated with fast transient response Over-current protection Frequency foldback short-circuit protection Thermal shutdown Point of load power supplies Simple high-efficiency step-down regulators 5V to 3.3V/2A conversion 12V to 5V/3.3V/2.5V/1.8V 3A conversion Dual-output ±5V conversion Base stations LCD power supplies Battery chargers Applications Ordering Information Part Number MIC4685BR Voltage Adj Junction Temperature Range - 40°C to +125°C Package SPAK-07L Typical Applications VIN 8V to 30V VIN...