參數(shù)資料
型號(hào)： LTC2902-2IGN
廠商： Linear Integrated Systems
英文描述： Programmable Quad Supply Monitor with Adjustable Reset Timer and Supply Tolerance
中文描述： 可編程四路電源監(jiān)視器可調(diào)復(fù)位定時(shí)器和供應(yīng)公差
文件頁(yè)數(shù)： 11/16頁(yè)
文件大小： 206K
代理商： LTC2902-2IGN
11
LTC2902
2902f
APPLICATIOU
W
U
U
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,
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:
V
V
R
R
V
V
TRIP
REF
REF
=
=
–
;
.
3
4
1 210
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
Tables 2 and 3 offer suggested 1% resistor values for
various adjustable applications.
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 chip. 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) have strong pull-down
capability. If the external load capacitance (C
LOAD
) for a
Table 2. Suggested 1% Resistor Values for the ADJ Inputs
V
SUPPLY
(V)
V
TRIP
(V)
12
11.25
10
9.4
8
7.5
7.5
7
6
5.6
5
4.725
3.3
3.055
3
2.82
2.5
2.325
1.8
1.685
1.5
1.410
1.2
1.120
1
0.933
0.9
0.840
R3 (k
)
2150
1780
1400
1300
1020
845
511
464
365
237
182
124
86.6
68.1
R4 (k
)
100
100
100
100
100
100
100
100
100
100
100
100
100
100
Table 3. Suggested 1% Resistor Values for the –ADJ Input
V
SUPPLY
(V)
V
TRIP
(V)
–2
–1.87
–5
–4.64
–5.2
–4.87
–10
–9.31
–12
–11.30
R3 (k
)
187
464
487
931
1130
R4 (k
)
121
121
121
121
121
Figure 5. Setting the Positive Adjustable Trip Point
Figure 6. Setting the Negative Adjustable Trip Point
–
+
2902 F06
V4
V
REF
13
12
V
TRIP
R4
1%
R3
1%
LTC2902
–
+
+
0.5V
5% TOLERANCE MODE
2902 F05
V3 OR V4
V
TRIP
R3
1%
R4
1%
LTC2902
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