參數(shù)資料
型號(hào)： LTC2908
廠商： Linear Integrated Systems
英文描述： Precision Six Supply Monitor
中文描述： 精密六電源監(jiān)視器
文件頁(yè)數(shù)： 9/16頁(yè)
文件大小： 171K
代理商： LTC2908
9
LTC2908
sn2908 2908fs
Adjustable Input
The noninverting input on the V
ADJ
comparator is set to
0.5V. And the high impedance inverting input directly ties
to the V
ADJ
pin.
In a typical application, this pin connects to a tap point on
an external resistive divider between the positive voltage
being monitored and ground. The following formula de-
rives the value of the R1 resistor in the divider from a
particular value of R2 and the desired trip voltage:
R
V
0 5
.
V
TRIP
1
1
=
–
R2
R2 = 100k is recommended. Table 1 shows suggested 1%
resistor values for various adjustable applications and
their corresponding trip thresholds.
Table 1. Suggested 1% Resistor Values for the V
ADJ
Inputs
V
SUPPLY
(V)
V
TRIP
(V)
12
11.25
10
9.4
8
7.5
7.5
7
6
5.6
5
4.725
3.3
3.055
3
2.82
2.5
2.325
1.8
1.685
1.5
1.410
1.2
1.120
1.0
0.933
0.9
0.840
0.8
0.750
0.7
0.655
0.6
0.561
R1 (k
)
2150
1780
1400
1300
1020
845
511
464
365
237
182
124
86.6
68.1
49.9
30.9
12.1
R2 (k
)
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
If an application has less than six supply voltages, the
unused supervisor inputs should be tied to the closest
higher supply voltage available.
APPLICATIOU
W
U
U
Figure 3. Setting the Adjustable Trip Point
–
+
+
R1
1%
R2
1%
0.5V
LTC2908-A1/LTC2908-B1
V
ADJ
2908 F03
V
TRIP
Threshold Accuracy
Specifying system voltage margin for worst-case operation
requires the consideration of three factors: power supply
tolerance, IC supply voltage tolerance and supervisor re-
set threshold accuracy. Highly accurate supervisors ease
the design challenge by decreasing the overall voltage
margin required for reliable system operation. Consider a
5V system with a
±
5% power supply tolerance band.
System ICs powered by this supply must operate reliably
within this band (and a little more, as explained below).
The bottom of the supply tolerance band, at 4.75V (5%
below 5V), is the exact voltage at which a perfectly
accurate supervisor generates a reset (see Figure 4).
Such a perfectly accurate supervisor does not exist—the
actual reset threshold may vary over a specified band
(
±
1.5% for the LTC2908 supervisors). Figure 5 shows the
typical relative threshold accuracy for all six inputs over
temperature.
REGION OF POTENTIAL MALFUNCTION
WITH 2.5% MONITOR
MINIMUM
RELIABLE
SYSTEM
VOLTAGE
SUPPLY
TOLERANCE
IDEAL
SUPERVISOR
THRESHOLD
5.000V
±
1.5%
THRESHOLD
BAND
±
2.5%
THRESHOLD
BAND
NOMINAL
SUPPLY
VOLTAGE
4.750V
4.675V
4.600V
4.500V
–5.0%
–6.5%
–8.0%
–10%
2908 F04
Figure 4. Threshold Band Diagram
相關(guān)PDF資料
PDF描述
LTC2908CDDB-A1 Precision Six Supply Monitor
LTC2908CDDB-B1 Precision Six Supply Monitor
LTC2908CTS8-A1 Precision Six Supply Monitor
LTC2908CTS8-B1 Precision Six Supply Monitor
LTC2908IDDB-A1 Precision Six Supply Monitor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC2908CDDB-A1 制造商:Linear Technology 功能描述:Volt Supervisor Monitor 1.8V/2.5V/3.3V/5V 8-Pin DFN EP
LTC2908CDDB-A1#PBF 制造商:Linear Technology 功能描述:Volt Supervisor Monitor 1.8V/2.5V/3.3V/5V 8-Pin DFN EP
LTC2908CDDB-A1#TR 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:高有效 復(fù)位超時(shí):- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT
LTC2908CDDB-A1#TRM 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:高有效 復(fù)位超時(shí):- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT
LTC2908CDDB-A1#TRMPBF 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:高有效 復(fù)位超時(shí):- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT
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