May 2005
Beginner to intermediate
398 pages
12h 12m
English
Content preview from Designing Embedded Hardware, 2nd Edition
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MAX603/MAX604 Regulators
A good small regulator is the Maxim MAX603 (5 V output) or MAX604 (3.3 V output). I tend to use these as the default "workhorse" regulators for many of my small designs. They use far less quiescent current than LM78xx regulators and as such are ideal for low-power or battery-operated systems. They are available in tiny surface-mount SO-8 or in standard DIP packages (discussed in Chapter 6) ande require only two external components.
The MAX603/604 can provide up to 500 mA of current and can operate from an input voltage of between +2.7 V and +11.5 V DC. They have built-in protection in case you inadvertently switch power and ground and consume as little as 15 μA of current for their own use. As such, they are ideal for use in low-power, embedded computers. The schematic for using a voltage regulator such as a MAX603 or a MAX604 is shown in Figure 5-6. In this case, the input supply is a battery, but it could just as easily be a DC plug pack or some other sort of supply.
Figure 5-6. MAX603/MAX604 circuit
A capacitor is required at the output (pin 8 of the regulator) to filter the voltage. This capacitor forms part of the regulation circuit and is required. The device will not work without it. The second support component required is a capacitor on the input (pin 1). This stabilizes the input voltage and can provide an additional current source during peak loads. ...
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