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参数资料
| 型号： | LTC2919CMS-2.5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR PREC 2.5V 10-MSOP |
| 标准包装： | 2,500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 3 |
| 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： | 2.213V，可调，可调 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
LTC2919
APPLICATIO S I FOR ATIO
To minimize errors arising from ADJ input bias and to
minimize loading on REF choose resistor R P1 (for positive
supply monitoring) or R N1 (for negative supply monitoring)
in the range of 5k to 100k.
R N4
REF
ADJ1
+
–
LOGIC
&
OPEN
DRAIN
MOSFET
OUT1
OV
–
For a positive-monitoring application, R P2 is then chosen
by:
R P2 = R P1 (2V TRIP – 1)
For a negative-monitoring application:
R N5
R N6
–V MON
ADJ2
0.5V
+
+
–
LOGIC
&
OPEN
DRAIN
MOSFET
OUT2
UV
V OV – V UV
R N2 = R N1 (1 – 2V TRIP )
Note that the value V TRIP should be negative for a negative
application.
The LTC2919 can also be used to monitor a single supply
for both UV and OV. This may be accomplished with three
resistors, instead of the four required for two independent
supplies. Con?gurations are shown in Figures 3 and 4. R P4
or R N4 may be chosen as is R P1 or R N1 above.
For a given R P4 , monitoring a positive supply:
R P5 = R P4
V UV
2919 F04
Figure 4. Setting UV and OV Trip Point for a Negative Supply
For example, consider monitoring a –5V supply at ±10%. For
this supply application: V OV = –5.575V and V UV = –4.425V.
Suppose we wish to consume about 5μA in the divider, so
R N4 = 100k. We then ?nd R N5 = 21.0k, R N6 = 1.18M (nearest
1% standard values have been chosen).
V CC Monitoring/UVLO
The LTC2919 contains an accurate third -10% undervoltage
monitor on the V CC pin. This monitor is ?xed at a nominal
11.5% below the V CC speci?ed in the part number. The
R P6 = R P4 ( 2V UV – 1 )
V OV
V UV
standard part (LTC2919-2.5) is con?gured to monitor a
2.5V supply (UVLO threshold of 2.213V), but versions
to monitor 3.3V and 5.0V (UVLO of 2.921V and 4.425V,
For monitoring a negative supply with a given R N4 :
respectively) are available.
R N5 = R N4
V UV – V OV
1 – V UV
For applications that do not need V CC monitoring, the
2.5V version should be used, and the UVLO will simply
guarantee that the V CC is above the minimum required for
R N6 = R N4 ( 1 – 2V UV )
1 – V OV
1 – V UV
proper threshold and timer accuracy before the timeout
begins.
Setting the Reset Timeout
–
V MON
R P6
R P5
R P4
ADJ1
ADJ2
0.5V
+
+
–
+
–
LOGIC
&
OPEN
DRAIN
MOSFET
LOGIC
&
OPEN
DRAIN
MOSFET
OUT1
OUT2
UV
OV
RST goes high after a reset timeout period set by the TMR
pin when the V CC and ADJ inputs are valid. This reset
timeout may be con?gured in one of three ways: internal
200ms, programmed by external capacitor and no timeout
(comparator mode).
In externally-controlled mode, the TMR pin is connected
by a capacitor to ground. The value of that capacitor allows
2919 F03
for selection of a timeout ranging from about 400μs to 9
seconds. See the following section for details.
Figure 3. Setting UV and OV Trip Point for a Positive Supply
2919f
12
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