AN938 Datasheet (ST Microelectronics)

AN938, Designing

For a better understanding of the device and it’s working principle, a short description of the main building blocks is given here below, with packaging options and complete block diagram.

Figure 1.

Two packaging options, with the pin function assignements.

OSC OUT OUT GND GND GND VCC VCC BOOT 1 2

www.DataSheet4U.com ® AN938 APPLICATION NOTE DESIGNING WITH L4973, 3.5A HIGH EFFICIENCY DC-DC CONVERTER by N.

Tricomi and G.

Gattavari INTRODUCTION The L4973 family is a 3.5A monolithic dc-dc converter, step- down topology, operating in continuous mode.

It is realized in BCD60 II technology, and it’s available in two plastic packages, POWERDIP18(12+3+3) and SO20L (12+4+4).

Two versions are available, one fixing the output voltage, without any voltage divider, at 3.3V, and the second at 5.1V.