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LTC1540IDD

Nanopower Comparator with Reference

Linear Technology 

LTC1540

TYPICAL APPLICATIONS

Low-Battery Detect

Figure 9 shows how to use the LTC1540 for a low-battery

detect, drawing only 1.4µA at VBAT = 2V. The circuit is

powered by a 2-cell NiCd battery. The VBAT pin could be as

low as 1.6V when the batteries are completely depleted.

The electrical specifications of the LTC1540 guarantee

operation down to a supply voltage of 2V, but it is still

functional with the supply as low as 1.6V. Some param-

eters, such as VREF and VOS, will be degraded on lower

supply voltages. The input voltage range extends from

0.9V below the positive supply to the negative supply.

R1

3M

R2

1.1M

3 IN+

4 IN–

VBAT = ~1.6V TO 2.5V

7

V + LTC1540

+

OUT 8

LBO

–

2-CELL

NiCd

6 REF

R3

40k

5 HYST

R4

1.2M

R5

1M

V– GND

2

1

1540 F09

Figure 9. Low-Battery Detect Works Down to 1.6V

sn1540 1540fas

9

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