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LTC1540CMS8 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC1540CMS8
Description  Nanopower Comparator with Reference
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1540CMS8 Datasheet(HTML) 9 Page - Linear Technology

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9
LTC1540
sn1540 1540fas
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.
TYPICAL APPLICATIONS
Figure 9. Low-Battery Detect Works Down to 1.6V
V +
R1
3M
R2
1.1M
VBAT = ~1.6V TO 2.5V
V
21
7
8
OUT
GND
LBO
2-CELL
NiCd
LTC1540
1540 F09
IN+
IN
REF
HYST
3
4
6
5
+
R3
40k
R4
1.2M
R5
1M


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