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| 型号： | LTC1998IS6#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 7/12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
QUICK DESIGN GUIDE
How to Calculate the External Resistor Values
The LTC1998 is a low battery warning indicator and is es-
pecially designed for monitoring the voltage of single-cell
Lithium-Ion batteries. The LTC1998 compares its supply
pin (BATT) to an accurate internal reference; if the battery
voltage falls below the programmed low battery threshold
voltage of the LTC1998, the battery low pin ( BATTLO ) will
change state, from high to low, to indicate a low battery
Example 1: A system using a 4.2V (fully charged) Lithium-
Ion battery requires a low battery threshold of 2.7V, 100mV
hysteresis and can allow up to 4.2μA maximum resistor
current.
R TOTAL = 1MΩ, R1 = 786k, R2 = 66k and R3 = 148k
Choose standard 1% values.
R1 = 787k, R2 = 66.5k, R3 = 147k
+
5
condition. The low battery threshold voltage is programmed
via the voltage threshold adjust pin (V TH.A ). A hysteresis
adjust pin (V H.A ) will add hysteresis to the programmed
value of the low battery threshold voltage.
1.5V TO 4.2V
R1
1%
0.1μF
4
V H.A
REGULATOR
1
BATT
V LOGIC
V LOGIC
Typical Application
R2
1%
3
LTC1998
V TH.A BATTLO
6
μP
Table 1: Design Equations for R1, R2, R3, Figure 1
R3
GND
Choose desired values for:
1%
2
1998 F01
? V BATT.Th : Low Battery Threshold Voltage
? V HYST : Hysteresis Voltage
? I R : Max Allowable Resistor Current
Solve:
Figure 1. Low Battery Threshold Detector with Hysteresis
R TOTAL = R 1 + R 2 + R 3 =
4.2V
I R
R 1 = R TOTAL ? ?
?
? 5 V
? V BATT . Th + V HYST
?
– 1 ?
R 2 = R TOTAL ? ?
?
? 5 V
? V BATT . Th
?
– 1 ? – R 1
R 3 = R TOTAL – R 1 – R 2
1998fb
7
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