May 2005
Beginner to intermediate
398 pages
12h 12m
English
Content preview from Designing Embedded Hardware, 2nd Edition
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MAX1615 Regulator
The MAX1615 is a linear regulator that can operate from a supply range between 4 V and 28 V. It is tiny and is capable of supplying 30 mA of output current at either 3.3 V or 5 V. 30 mA is not much current, but for very small (battery-powered) applications, it may be sufficient. The MAX1615 has a shutdown input, allowing an external system to power it down. One use for this regulator could be as a power source to subsystems within an embedded computer, allowing the host processor to turn them off when not in use. Before turning off a subsystem, ensure that its "absence" won't adversely affect the functionality of the rest of the system.
The basic schematic for a MAX1615 circuit is shown in Figure 5-7.
Figure 5-7. MAX1615 circuit
The 5/
pin determines the output voltage. By tying it to ground, the output is set to 3.3 V. Connect the pin to the input, and the output voltage is set to 5 V. For continuous operation, tie the shutdown pin (
) to the input voltage. To allow the regulator to be powered down, connect to a processor I/O line or a simple power switch. (It goes without ...
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