The ADP1147 is part of a family of High Efficiency Step-Down Switching Regulators. These regulators offer superior load and line transient response, a user defined current limit and an automatic power savings mode. The automatic power savings mode is used to maintain efficiency at lower output currents. The ADP1147 incorporates a constant off-time, current mode switching architecture to drive an external P-channel MOSFET at frequencies up to 250 kHz. Constant off-time switching erates a constant ripple current in the external inductor. This results in a wider input voltage operating range of 3.5 V* to 16 V, and a less complex circuit design. *3.5 volt operation is for the ADP1147-3.3. * Greater Than 95% Efficiency * Shutdown Pin * Current Mode Switching Architecture Provides Superior Load and Line Transient Response * Low Dropout Voltage * Low Standby Current 160 µA typ