The LT1676 is a wide input range, high efficiency Buck (step-down) switching regulator. The monolithic die includes all oscillator, control and protection circuitry. The part can accept input voltages as high as 60V and contains an output switch rated at 700mA peak current. Current mode control offers excellent dynamic input supply rejection and short-circuit protection.The LT1676 contains several features to enhance efficiency. The internal control circuitry is normally powered via the VCCpin, thereby minimizing power drawn directly from the VINsupply (see Applications Information). The action of the LT1676 switch circuitry is also load dependent. At medium to high loads, the output switch circuitry maintains high rise time for good efficiency. At light loads, rise time is deliberately reduced to avoid pulse skipping behavior.The available SO-8 package and 100kHz switching frequency allow for minimal PC board area requirements.ApplicationsAutomotive DC/DC ConvertersTelecom 48V Step-Down ConvertersCellular Phone Battery Charger AccessoriesIEEE 1394 Step-Down Converters