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参数资料
| 型号： | LTC2901-3IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR QUAD SUPP PROG 16SSOP |
| 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 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) |
LTC2901
APPLICATIO S I FOR ATIO
V TRIP
Table 2. Suggested 1% Resistor Values for the ADJ Inputs
R3
LTC2901
V SUPPLY (V)
V TRIP (V)
R3 (k Ω )
R4 (k Ω )
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
6
5
5.6
4.725
1020
845
100
100
2901 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
12
V REF
LTC2901
1.8
1.685
237
100
R4
1%
R3
1%
V TRIP
13 V4
–
+
1.5
1.2
1
0.9
1.410
1.120
0.933
0.840
182
124
86.6
68.1
100
100
100
100
Table 3. Suggested 1% Resistor Values for the –ADJ Input
2901 F06
Figure 6. Setting the Negative Adjustable Trip Point
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 Ω .
V SUPPLY (V)
–2
–5
–5.2
–10
–12
V TRIP (V)
–1.87
–4.64
–4.87
–9.31
–11.30
R3 (k Ω )
187
464
487
931
1130
R4 (k Ω )
121
121
121
121
121
Tables 2 and 3 offer suggested 1% resistor values for
various adjustable applications.
Once the resistor divider is set in the 5% tolerance mode
(LTC2901-3/LTC2901-4), there is no need to change the
divider for the 10% mode because the internal and exter-
nal reference is scaled accordingly, moving the trip point
by –5%.
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 CC for the device. Filter capacitors on the V3 and V4
inputs are allowed.
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, WDO) have strong pull-
down capability. If the external load capacitance (C LOAD )
for a particular output is known, output fall time (10% to
90%) is estimated using:
t FALL ≈ 2.2 ? R PD ? C LOAD
where R PD is the on-resistance of the internal pull-down
transistor. The typical performance curve (V OL vs I SINK )
demonstrates that the pull-down current is somewhat
linear versus output voltage. Using the 25 ° C curve, R PD is
estimated to be approximately 40 Ω . Assuming a 150pF
load capacitance, the fall time is about 13.2ns.
Although the outputs are considered to be “open-drain,”
they do have a weak pull-up capability (see COMPX or RST
2901fb
12
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