GENERAL DESCRIPTION

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.

FEATURES

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