STMicroelectronics | L4973D5.1-013TR

The L4973D5.1-013TR is a step down monolithic power switching regulator delivering 3.5 A at fixed voltages of 3.3 V or 5.1 V 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 0.15 Ω) to obtain very high efficiency and very fast switching times.

A wide input voltage range between 8 V to 55 V and output voltages regulated from 3.3 V to 40 V 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

Features:

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