1540 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'1540' PDF : 12 Pages View PDF
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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