ACT  -  Series DataSheet
ACT4012A  -  Wide Input 1.5A Step Down Converter  -  Active Semi  -  DC-DC

FEATURES
• 1.5A Output Current
• Up to 94% Efficiency
• Up to 20V Input Range
• 10μA Shutdown Supply Current
• 420kHz Switching Frequency
• Adjustable Output Voltage
• Cycle-by-Cycle Current Limit Protection
• Thermal Shutdown Protection
• Frequency Foldback at Short Circuit
• Stability with Wide Range of Capacitors,Including Low ESR Ceramic Capacitors
• SOP-8 Package
APPLICATIONS
• TFT LCD Monitors
• Portable DVDs
• Car-Powered or Battery-Powered Equipments
• S-Top Boxes
• Telecom Power Supplies
• DSL and Cable Modems and Routers
• Termination Supplies
GENERAL DESCRIPTION
The ACT4012A is a current-mode step-down DC/DC converter that generates up to 1.5A output 420kHz switching frequency. The device utilizes Active-Semi’s proprietary ISOBCD20 process for operation with input voltages up to 20V.
Consuming only 10μA in shutdown mode, the ACT4012A is highly efficient with peak efficiency at 94% when in operation. Protection features include cycle-by-cycle current limit, thermal shutdown, and frequency foldback at short circuit.
The ACT4012A is available in a SOP-8 package and requires very few external devices for operation.