xl1583电源管理ic(可完全代替act4070)

**3a output current
**up to 95% efficiency
**4.5v to 30v input range
**6µa shutdown supply current
**400khz switching frequency 

** adjustable output voltage
**cycle-by-cycle current limit protection
**thermal shutdown protection
**internal soft start function
**frequency fold back at short circuit
**stability with wide range of capacitors,  

**including low esr ceramic capacitors
?? *sop-8/ep (exposed pad) package

**tft lcd monitors or televisions and hdtv
**portable dvd players
**car-powered or battery-powered equipment
**set-top boxes
**telecom power supplies
**dsl and cable modems and routers

the act4070 is a current-mode step-down
dc/dc converter that generates up to 3a output
current at 400khz switching frequency. the
device utilizes active-semi’s proprietary
isobcd30 process for operation with input
voltage up to 30v.
consuming only 6μa in shutdown mode, the
act4070 is highly efficient with peak efficiency at
95% when in operation. protection features
include cycle-by-cycle current limit, thermal
shutdown, and frequency fold back at short circuit.
the device also includes an internal soft start
function to prevent overshoot.
the act4070 is available in sop-8/ep exposed
pad package and requires very few external
devices for operation.