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 RDS(on) of 0.15â¦) 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).
Features
â Up to 3.5A step down converter
â Operating input voltage from 8V to 55V
â 3.3V and 5.1V (±1%) fixed output, and adjustable outputs from:
– 0.5V to 50V (3.3 type)
– 5.1V to 50V (5.1 type)
â Frequency adjustable up to 300kHz
â Voltage feed forward
â Zero load current operation (min 1mA)
â Internal current limiting (pulse by pulse and HICCUP mode)
â Precise 5.1V (1.5%) reference voltage externally available
â Input/output synchronization function
â Inhibit for zero current consumption (100mA typ. at VCC = 24V)
â Protection against feedback disconnection
â Thermal shutdown
â Output over voltage protection
â Soft start function
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