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参数资料
| 型号： | LTC2910HGN |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件页数： | 16/16页 |
| 文件大小： | 520K |
| 代理商： | LTC2910HGN |
LTC2910
9
2910fc
APPLICATIONS INFORMATION
2. Choose RB to complete the design
Once RA is known, RB is determined by:
R
V
R
B
m
A
=
Im
(2)
If any of the variables Vm, Im, or VUV change, then both
steps must be recalculated.
Positive Voltage Monitor Example
A positive voltage monitor application is shown in Figure
3. The monitored voltage is a 5V ±10% supply. Nominal
current in the resistive divider is 10μA.
1. Find RA to set the UV trip point of the monitor.
R
V
A
V
k
A =
≈
05
10
5
45
56 2
.
.
2. Determine RB to complete the design.
R
V
A
kk
B =
≈
5
10
56 2
499
.
Negative Voltage Monitor Example
A negative voltage monitor application is shown in Figure
4. The monitored voltage is a –5V ±10% supply. Nominal
current in the resistive divider is 10μA. For the negative
case, 1V is subtracted from Vm and VUV.
1. Find RA to set the UV trip point of the monitor.
R
V
A
VV
k
A =
≈
05
10
51
45
1
54 9
.
–
–.
.
2.Determine RB to complete the design.
R
VV
A
kk
B =
≈
–
.
51
10
57 6
549
Power-Up/Down
As soon as VCCreaches1Vduringpowerup,theRSToutput
asserts low and the RST output weakly pulls to VCC.
The LTC2910 is guaranteed to assert RST low and RST high
under conditions of low VCC, down to VCC = 1V. Above VCC
= 2V (2.1V maximum) the Vn inputs take control.
Once all inputs and VCC become valid, an internal timer is
started. After an adjustable delay time, RST pulls low and
RST weakly pulls high.
Threshold Accuracy
Reset threshold accuracy is important in a supply sensitive
system. Ideally, such a system would reset only if supply
Figure 3. Positive Supply Monitor
2910 F03
RB
449k
RA
56.2k
5V ± 10%
RST
SEL
V7
VCC
5V
GND
LTC2910
Figure 4. Negative Supply Monitor
2910 F04
RA
54.9k
RB
549k
–5V ± 10%
RST
SEL
REF
V7
VCC
5V
GND
LTC2910
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