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參數(shù)資料
| 型號(hào)： | LTC1998CS6 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Quadruple Bus Buffer Gates With 3-State Outputs 14-SO -40 to 85 |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 143K |
| 代理商： | LTC1998CS6 |
LTC1998
5
1998f
1998 F01
LTC1998
R1
1%
R2
1%
R3
1%
V
H.A
V
TH.A
BATT
V
LOGIC
BATTLO
GND
4
3
2
1
5
6
REGULATOR
μ
P
L
0.1
μ
F
1.5V TO 4.2V
V
LOGIC
+
Figure 1. Low Battery Threshold Detector with Hysteresis
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 4.2
μ
A maximum
resistor current.
R
TOTAL
= 1M
, R1 = 786k, R2 = 66k and R3 = 148k
Choose standard 1% values.
R1 = 787k, R2 = 66.5k, R3 = 147k
QUICK DESIGU
Typical Application
Table 1: Design Equations for R1, R2, R3, Figure 1
Choose desired values for:
V
BATT.Th
: Low Battery Threshold Voltage
V
HYST
: Hysteresis Voltage
I
R
: Max Allowable Resistor Current
Solve:
R
R
R
R
V
I
R
R
V
+
V
V
R
R
V
V
R
R
R
R
R
TOTAL
R
TOTAL
BATT Th
5
HYST
TOTAL
BATT Th
1
–
TOTAL
=
+
+
=
=
–
=
=
1
2
3
4 2
.
1
5
1
2
1
1
3
2
–
–
–
.
.
LOW BATTERY THRESHOLD VOLTAGE AND
HYSTERESIS ADJUST
Low Battery Threshold Voltage Adjustment, Pin 3
The low battery threshold voltage is the battery voltage
which will trip the (BATTLO) pin high to low. It should be
adjusted via the threshold adjust pin (V
TH.A
). This is a high
input impedance pin that senses an externally applied
voltage and programs the low battery threshold voltage
(V
BATT.Th
). The V
TH.A
pin is designed to accommodate
voltages from 0V to 1.5V with respect to ground. This
allows the low battery threshold voltage to be set to any
voltage between 2.5V and 3.25V, that is:
V
V
V
(
BATT Th
TH A
2
.
.
.
)
=
+
2 5
APPLICATIOU
W
U
U
For instance, if the applied voltage at pin 3, V
TH.A
, is 1V the
LTC1998 will indicate a low battery condition when the
battery voltage pin (BATT) falls below 3V.
The voltage at the threshold adjust pin (V
TH.A
) can be set
with any voltage source. This pin allows a continuous time
adjustment, that is, the low battery threshold voltage may
be changed at any time. The high input impedance of the
V
TH.A
pin allows the use of a high valued resistive divider
(to minimize current drain) from the battery to set the
battery low threshold voltage, Figure 2.
Figure 2. Resistor Divider Sets Threshold
1998 F02
LTC1998
R1
R2
V
TH.A
BATT
+
L
1
2
3
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1998CS6#PBF | 制造商:Linear Technology 功能描述:Comparator and Voltage Reference 6-Pin TSOT-23 |
| LTC1998CS6#TR | 功能描述:IC COMP/PREC ADJ REF TSOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1998CS6#TRM | 功能描述:IC DETECT VOLT PR LOBATT SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC1998CS6#TRMPBF | 功能描述:IC DETECT VOLT PR LOBATT SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:Impedance Track™ 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.4 V ~ 2.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁(yè)面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名稱:296-21665-2 |
| LTC1998CS6#TRPBF | 功能描述:IC DETECT VOLT PR LOBATT SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
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