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LTC1540C bảng dữ liệu(PDF) 9 Page - Linear Technology

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LTC1540C bảng dữ liệu(HTML) 9 Page - Linear Technology

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9
LTC1540
Low-Battery Detect
Figure 9 shows how to use the LTC1540 for a low-battery
detect, drawing only 1.4
µA 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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