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L4973 Datasheet 3.5A step down switching regulator

Manufacturer: STMicroelectronics

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General Description

The L4973 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 50 V.

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.

Switching frequency up to 300 kHz are achievable (the maximum power dissipation of the packages must be observed).

Overview

L4973 3.5 A step down switching regulator Datasheet - production data • Thermal shutdown • Output over voltage protection • Soft-start function SO-20.

Key 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 availa.

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