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参数资料
| 型号： | LTC2908CDDB8-A1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 6-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 3 X 2 MM, PLASTIC, M0-229WECD-1, DFN-8 |
| 文件页数： | 16/16页 |
| 文件大小： | 199K |
| 代理商： | LTC2908CDDB8-A1 |
9
LTC2908
2908f
Adjustable Input
The noninverting input on the VADJ comparator is set to
0.5V. And the high impedance inverting input directly ties
to the VADJ 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
TRIP
1
05
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 VADJ Inputs
VSUPPLY (V)
VTRIP (V)
R1 (k
)
R2 (k
)
12
11.25
2150
100
10
9.4
1780
100
8
7.5
1400
100
7.5
7
1300
100
6
5.6
1020
100
5
4.725
845
100
3.3
3.055
511
100
3
2.82
464
100
2.5
2.325
365
100
1.8
1.685
237
100
1.5
1.410
182
100
1.2
1.120
124
100
1.0
0.933
86.6
100
0.9
0.840
68.1
100
0.8
0.750
49.9
100
0.7
0.655
30.9
100
0.6
0.561
12.1
100
If an application has less than six supply voltages, the
unused supervisor inputs should be tied to the closest
higher supply voltage available.
APPLICATIO S I FOR ATIO
WU
UU
Figure 3. Setting the Adjustable Trip Point
–
+
–
R1
1%
R2
1%
0.5V
LTC2908-A1/LTC2908-B1
VADJ
2908 F03
VTRIP
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%fortheLTC2908supervisors). Figure5showsthe
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| LTC2908CDDB-A1#TRM | 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| LTC2908CDDB-A1#TRMPBF | 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
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