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参数资料
| 型号： | LTC2903CS6-C1#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR SUPPLY QUAD SOT23-6 |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 4 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 1.593V，2.921V，4.425V，-4.602V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 带卷 (TR) |
LTC2903-1
APPLICATIO S I FOR ATIO
Table 1a contains suggested 1% resistor values for the
ADJ inputs to obtain nominal –11.5% thresholds. Connect
unused supervisor inputs to the highest supply voltage
available.
Table 1a. Suggested 1% Resistor Values for the –11.5% ADJ Inputs
Implications of Threshold Accuracy
Specifying system voltage margin for worst-case opera-
tion requires consideration of three factors: power supply
tolerance, IC supply voltage tolerance and supervisor re-
set threshold accuracy. Highly accurate supervisors ease
V SUPPLY (V)
12
10
8
7.5
6
5
3.3
3
2.5
1.8
1.5
1.2
1
0.9
V TRIP (V)
10.75
8.95
7.15
6.7
5.38
4.435
2.935
2.66
2.2
1.605
1.325
1.065
0.884
0.795
R1 (k ? )
2050
1690
1330
1240
976
787
487
432
340
221
165
113
76.8
59
R2(k ? )
100
100
100
100
100
100
100
100
100
100
100
100
100
100
the design challenge by decreasing the overall voltage
margin required for reliable system operation. Consider a
5V system with a ± 10% 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 4.5V (5V –
10%), is the exact voltage at which a perfectly accurate
supervisor generates a reset. Such a perfectly accurate
supervisor does not exist—the actual reset threshold may
vary over a specified band ( ± 1.5% for the LTC2903-1 su-
pervisors). Figure 4 shows the typical relative threshold
accuracy for all four inputs, over temperature.
With this variation of reset threshold in mind, the nominal
reset threshold of the supervisor resides below the mini-
mum supply voltage, just enough so that the reset thresh-
old band and the power supply tolerance bands do not
Table 1b contains suggested 1% resistor values for the
ADJ inputs to obtain nominal –6.5% thresholds.
Table 1b. Suggested 1% Resistor Values for the –6.5% ADJ Inputs
overlap. If the two bands overlap, the supervisor could
generate a false or nuisance reset when the power supply
remains within its specified tolerance band (say, at 4.6V).
Adding half of the reset threshold accuracy spread (1.5%)
V SUPPLY (V)
12
10
8
7.5
6
5
3.3
3
2.5
1.8
1.5
1.2
1.0
0.9
V TRIP (V)
11.25
9.4
7.5
7
5.6
4.725
3.055
2.82
2.325
1.685
1.410
1.120
0.933
0.840
R1 (k ? )
2150
1780
1400
1300
1020
845
511
464
365
237
182
124
86.6
68.1
R2(k ? )
100
100
100
100
100
100
100
100
100
100
100
100
100
100
to the ideal 10% thresholds puts the LTC2903-1 thresh-
olds at 11.5% (typ) below the nominal input voltage. For
example, the 5V typical threshold is 4.425V, or 75mV
below the ideal threshold of 4.500V. The guaranteed
threshold lies in the band between 4.500V and 4.350V
over temperature.
1.5
1.0
0.5
0
–0.5
–1.0
0.8
0.750
49.9
100
–1.5
–50
–25
0
25
50
75
100
0.7
0.655
30.9
100
TEMPERATURE ( ° C)
29031 F04
0.6
0.561
12.1
100
Figure 4. LTC2903 Typical Threshold Accuracy vs Temperature
29031f a
11
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| LTC2903CS6D1 | 制造商:Linear Technology 功能描述: |
| LTC2903CS6-D1#PBF | 制造商:Linear Technology 功能描述:Volt Supervisor Monitor 3.3V 6-Pin TSOT-23 制造商:Linear Technology 功能描述:MONITOR 20uA 6.5V TSOT-23-6 制造商:Linear Technology 功能描述:MONITOR, 20uA, 6.5V, TSOT-23-6; No. of Supervisors / Monitors:4; Supply Voltage Min:200mV; Supply Voltage Max:6.5V; Reset Type:Active-Low, Open-Drain; Digital IC Case Style:TSOT-23; No. of Pins:6; Supply Current:20A ;RoHS Compliant: Yes |
| LTC2903CS6-D1#TRM | 制造商:Linear Technology 功能描述:Volt Supervisor Monitor 3.3V 6-Pin TSOT-23 T/R |
| LTC2903CS6-D1#TRMPBF | 功能描述:IC QUAD SPLY MONITOR ADJ SOT23-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 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，开路漏极 复位:高有效/低有效 复位超时:最小为 250 ms 电压 - 阀值:4.37V，4.62V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 产品目录页面:1337 (CN2011-ZH PDF) |
| LTC2903CS6-D1#TRPBF | 功能描述:IC QUAD SPLY MONITOR ADJ SOT23-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:400 系列:- 类型:备用电池电路 监视电压数目:1 输出:开路漏极，推挽式 复位:高有效/低有效 复位超时:最小为 35 ms 电压 - 阀值:4.65V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC W 包装:带卷 (TR) 其它名称:ADM691ARZ-REEL7TR |
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