There are presently many switching regulator ICs. However, the STA801 and STA802 provide two switching regulators in a single package, each capable of supplying a maximum current of 0.5 A. Each device in the Allegro Microsystems STA800 series (www.allegromicro.com) contains a first step-down switcher with an output voltage of +5 V (STA801M) or +9 V (STA802M) and a second switcher that can be jumper-programmed for an output voltage of +9 V, +11.5 V, +12 V or +15 V. Jumpers 1 and 2 in the schematic diagram must be installed according to the table to achieve the desired output voltage.
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