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L4973：3.5 A Switching Regulator

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 R_DS(on) of 0.15Ω) 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. Features of this new generation of DC-DC converter includes pulse by pulse current limit, hiccup mode for output short circuit protection, voltage feed forward regulation, soft start, input/output synchronization, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown. Packages available are in plastic dual in line, DIP- 18 (12+3+3) for standard assembly, and SO20 (12+4+4) for SMD assembly.

Key Features

• Inhibit for zero current consumption (100mA at VCC = 24V)
• Input/output synchronization function
• Thermal shutdown
• Protection against feedback disconnection
• Soft start function
• Output over voltage protection
• Internal current limiting (pulse by pulse and HICCUP mode)
• Zero load current operation (min 1mA)
• Up to 3.5A step down converter
• 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)
• Operating input voltage from 8V to 55V
• Voltage feed forward
• Precise 5.1V (1.5%) reference voltage externally available
• Frequency adjustable up to 300kHz

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