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| 型号： | LTC1998IS6#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC DET VOLT PROG LOBATT SOT23-6 |
| 标准包装： | 500 |
| 功能： | 过压/欠压保护 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 1 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1998IS6 LTC1998IS6-ND |
LTC1998
APPLICATIONS INFORMATION
The calculation of the resistor values R1, R2 and R3 is
quite straightforward and similar to the procedure outlined
in the previous paragraph.
Choose a value for the sum of R1 + R2 + R3 as well as the
values for low battery threshold and hysteresis.
VERSATILE OUTPUT DRIVER
V LOGIC , BATTLO (Pins 5,6)
The LTC1998 uses a CMOS push-pull output stage to drive
the low battery output signal. This output pin ( BATTLO )
R 1 = ( R 1 + R 2 + R 3 ) ?
– 1 ?
Solve for resistor R1:
? 5 V
? V TH 2
?
?
has a separate supply pin, (V LOGIC ) that can be used to
provide an output voltage rail matching the V DD logic of
microprocessors. The V LOGIC pin may be tied to a volt-
age lower than the voltage at the BATT pin. The V LOGIC
pin may also be tied to a voltage higher than V BATT via a
( R 1 + R 2 ) = ( R 1 + R 2 + R 3 ) ?
– 1 ?
Solve for the sum of
then solve for R2 and R3.
? 5 V
? V BATT . Th
?
?
series resistor greater than 10k. The output will then act
as an open-drain device.
In a given application, if it is possible for BATTLO to be
shorted to GND or a supply, a series resistor should be
added to limit the short-circuit current to 5mA.
Example: A system needs to detect a low battery
voltage of 3V (V BATT.Th = 3V) with 250mV hysteresis
(V TH2 = 3.25V). Set the value of the resistor divider
(R1 + R2 + R3) = 1M.
R1 = 539k, R1 + R2 = 667k, R2 = 128k, R3 = 333k.
Choose the closest 1% values, that is 536k, 332k, 127k.
Figure 4 graphically shows the function of the LTC1998 as
described above.
3.25V
PROGRAMMED
HYSTERESIS
THRESHOLD
PROGRAMMED
LOW BATT
THRESHOLD
2.50V
V LOGIC
PROGRAMMABLE
THRESHOLD RANGE
BATTERY
VOLTAGE
HYSTERESIS
BATTERY VOLTAGE
RECOVERS UNDER
REDUCED LOAD
BATTLO
1998 F04
Figure 4. LTC1998 Function Plot
1998fb
10
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