AAT1152

850kHz 1A Synchronous Buck DC/DC Converter General Description The AAT1152 SwitchReg™ is a member of AnalogicTech™'s Total Power Management™ IC product family. The Step-down switching converter is ideal for applications where high efficiency, small size, and low ripple are critical. Able to deliver 1A with internal Power MOSFETs, the current-mode controlled IC provides high efficiency using synchronous rectification. Fully internally compensated, the AAT1152 simplifies system design and lowers external part count. The AAT1152 features a Power Good (POK) function which monitors the output, alerting the system if the output voltage falls out of regulation. The AAT1152 is available in MSOP-8 package, rated over -40 to 85°C. AAT1152 Features SwitchReg™ 5.5V max supply input Fixed output voltage: 1.1V–4.2V with 100 mV increment 1A output current Integrated low on resistance power switches Synchronous rectification Up to 95% efficiency Power Good signal Internally compensated current mode control High initial accuracy: ±1% 850kHz switching frequency Constant PWM mode Low output ripple with light load Internal softstart Current limit protection Over-Temperature protection MSOP-8 package Preliminary Information Applications Computer Peripherals Set Top Boxes Network Cards Cable/DSL Modems High efficiency conversion from 5V or 3.3V supply Typical Application INPUT 100k 10µF VP AAT1152 POK FB 4.1µH LX ENABLE 100Ω VCC OUTPUT SGND 0....