DESCRIPTION
●The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V.
●Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.15ohm) to obtain very high efficiency and very fast switching times.
●Switching frequency up to 300KHz are 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 the today applications.
●■ UP TO 3.5A STEP DOWN CONVERTER
●■ OPERATING INPUT VOLTAGE FROM 8V TO 55V
●■ 3.3V AND 5.1V (±1%) FIXED OUTPUT, AND ADJUSTABLE OUTPUTS FROM:
● 0V TO 50V (3.3V type)
● 5.1V TO 50V (5.1 type)
●■ FREQUENCY ADJUSTABLE UP TO 300KHz
●■ VOLTAGE FEED FORWARD
●■ ZERO LOAD CURRENT OPERATION (min 1mA)
●■ INTERNAL CURRENT LIMITING (PULSE BY PULSE AND HICCUP MODE)
●■ PRECISE 5.1V (1.5%) REFERENCE VOLTAGE EXTERNALLY AVAILABLE
●■ INPUT/OUTPUT SYNCHRONIZATION FUNCTION
●■ INHIBIT FOR ZERO CURRENT CONSUMPTION (100µA Typ. at VCC = 24V)
●■ PROTECTION AGAINST FEEDBACK DISCONNECTION
●■ THERMAL SHUTDOWN
●■ OUTPUT OVERVOLTAGE PROTECTION
●■ SOFT START FUNCTION
