DescriptionThe L4976 is a step down monolithic power switching regulator delivering 1A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rds(ON) of 0.25) to obtain very high efficency and high switching speed. A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 40V cover the majority of todays applications. Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, protection against feedback loop disconnection and thermal shutdown. The device is available in plastic dual in line, MINIDIP 8 for standard DIP8SO16Wwww.st.comFigure 1.Typical application circuit 5241L49761220F63V8330FVO=3.3V/1AVi=8V to 55VR120KC22. Features Up to 1A step down converterOperating input voltage from 8v to 55vPrecise 5.1V reference voltageOutput voltage adjustable from 0.5V to 50VSwitching frequency adjustable up to 300kHzVoltage feedforwardZero load current operationInternal current limiting (pulse-bypulseand hiccup mode)Protection against feedback disconnectionThermal shutdownDescriptionThe L4976 is a step down monolithic power switching regulator delivering 1A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rds(ON) of 0.25) to obtain very high efficency and high switching speed. A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 40V cover the majority of todays applications. Features of this new generations of DC-DC converter include pulse Specification refered to Tj from 0 to 125CTabl