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L4973
3.5 A step down switching regulator
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
Figure 1. Internal schematic diagram
DIP-18 (12+3+3)
SO-20 (12+4+4)
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.