参数资料
型号: LTC2903IS6-E1#TRPBF
厂商: Linear Technology
文件页数: 10/16页
文件大小: 0K
描述: IC QUAD SPLY MONITOR ADJ 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: 4.675V,可调,可调,可调
工作温度: -40°C ~ 85°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
current sinking ability for single supply and triple supply-
tracking applications. Figure 2 shows a detailed view of the
reset pin voltage with a 10k pull-up resistor to V1.
The LTC2903-1 supervisors derive their internal supply
voltage (V CC ) automatically from the greater voltage on the
V1 and V2 inputs (V CC = V1 for options D1 and E1). With
all supply inputs above threshold, the quiescent current
drawn from V CC is 20 μ A (typ).
Supply Monitoring
The LTC2903-1 accurately monitors four inputs in a small
6-lead SOT-23 package. The low voltage reset output
includes an integrated 200ms reset delay timer. The reset
Triple Adjustable Options (LTC2903-D1, LTC2903-E1)
LTC2903-D1 and LTC2903-E1 provide 3 adjustable in-
puts: V2, V3 and V4. The V1 threshold is 3.086V (3.3V,
5%) for option D1 and 4.675 (5V, 5%) for option E1. For
each supply monitored by an adjustable input, connect an
external resistor divider (R1 and R2) between the positive
voltage being sensed and ground. The tap point for each
divider is then connected to each adjustable input. All
adjustable inputs are compared to an internal 0.5V
reference.
Figure 3 shows how each adjustable input is configured.
Calculate the trip voltage from:
V TRIP = 0 . 5 V ? 1 +
R 2 ?
linepullshigh200msafterallvoltageinputsexceedtheir
respective thresholds. The reset output remains low dur-
ing power-up, power-down and brownout conditions on
?
?
R 1 ?
?
any of the voltage inputs.
V TRIP
LTC2903-A1
0.7
0.6
0.5
T A = 25 ° C
COMPETITION
V4
R1
R2
+
0.4
PART
0.5V
+
0.3
29031 F03
0.2
V1 ONLY
0.1
V1 = V2 = V3
Figure 3. Setting the Positive Adjustable Trip Point
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
V1 (V)
29031 F02
Figure 2. RST Output Voltage with a 10k Pull-Up to V1
(Enlarged Area of Detail)
29031f a
10
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