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| 型号： | LTC2902-2IGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR SUPPLY QUAD 16-SSOP |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 4 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 5 ms |
| 电压 - 阀值： | 16 种可选阀值组合 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
LTC2902
APPLICATIO S I FOR ATIO
V TRIP
Table 2. Suggested 1% Resistor Values for the ADJ Inputs
R3
LTC2902
V SUPPLY (V)
V TRIP (V)
R3 (k ? )
R4 (k ? )
V3 OR V4
1%
R4
1%
+
–
12
10
8
11.25
9.4
7.5
2150
1780
1400
100
100
100
7.5
7
1300
100
–
+
0.5V
5% TOLERANCE MODE
6
5
5.6
4.725
1020
845
100
100
2902 F05
Figure 5. Setting the Positive Adjustable Trip Point
3.3
3
2.5
3.055
2.82
2.325
511
464
365
100
100
100
R4
12
V REF
LTC2902
1.8
1.5
1.685
1.410
237
182
100
100
1%
R3
1%
13 V4
–
+
1.2
1
0.9
1.120
0.933
0.840
124
86.6
68.1
100
100
100
V TRIP
Table 3. Suggested 1% Resistor Values for the –ADJ Input
2902 F06
Figure 6. Setting the Negative Adjustable Trip Point
In the negative adjustable mode, the noninverting input on
the V4 comparator is connected to ground (Figure 6). The
tap point on an external resistive divider, connected be-
tween the negative voltage being sensed and the V REF pin,
V SUPPLY (V)
–2
–5
–5.2
–10
–12
V TRIP (V)
–1.87
–4.64
–4.87
–9.31
–11.30
R3 (k ? )
187
464
487
931
1130
R4 (k ? )
121
121
121
121
121
is connected to the high impedance inverting input (V4).
V REF provides the necessary level shift required to operate
at ground. The trip voltage is calculated from:
Although all four supply monitor comparators have built-in
glitch immunity, bypass capacitors on V1 and V2 are
recommended because the greater of V1 or V2 is also the
= – V
V TRIP REF ?
? ; V
? R 3 ?
? R 4 ? REF
= 1 . 210 V
V CC for the chip. Filter capacitors on the V3 and V4 inputs
are allowed.
T0,T1 Low (5% Tolerance Mode)
Once the resistor divider is set in the 5% tolerance mode,
there is no need to change the divider for the other
tolerance modes (7.5%, 10%, 12.5%) because V REF is
scaled accordingly, moving the trip point in – 2.5%
increments.
In a negative adjustable application, the minimum value
for R4 is limited by the sourcing capability of V REF ( ± 1mA).
With no other load on V REF , R4 (minimum) is:
1.21V ÷ 1mA = 1.21k ?
Power-Down
On power-down, once any of the V X inputs drop below
their threshold, RST and COMPX are held at a logic low.
A logic low of 0.4V is guaranteed until both V1 and V2
drop below 1V. If the bandgap reference becomes invalid
(V CC < 2V typ), the part will reprogram once V CC rises
above 2.4V (max).
Monitor Output Rise and Fall Time Estimation
All of the outputs (RST, COMPX) have strong pull-down
capability. If the external load capacitance (C LOAD ) for a
Tables 2 and 3 offer suggested 1% resistor values for
various adjustable applications.
2902f
11
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