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Partname: | AN1872 |
Description: | Low-Battery Indicator Has Low Cost and High Efficiency |
Manufacturer: | Maxim Integrated Products |
Datasheet: | PDF (223K). Click here to download *) |
The usual method for implementing the low-battery warning featured in most battery-operated equipment is to illuminate an LED. By drawing current, however, the LED exacerbates the low-battery condition. You can greatly reduce the LED's power consumption by operating it at a low frequency and a low duty cycle. An existing low-battery output (LBO) like that found on DC-DC converters offers a convenient way to light the LED (Figure 1). IC1 is a small, inexpensive comparator with shutdown capability in a 6-pin SC70 package. It remains in shutdown while the battery voltage is at normal operating levels, but asserts LBO when battery voltage falls below a preset threshold. |
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Click here to download AN1872 Datasheet*) |
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