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LTC2921IGN 데이터시트(PDF) 16 Page - Linear Technology

부품명 LTC2921IGN
상세설명  Power Supply Tracker with Input Monitors
PDF  20 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC2921IGN 데이터시트(HTML) 16 Page - Linear Technology

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LTC2921/LTC2922 Series
16
29212fa
APPLICATIO S I FOR ATIO
Selecting RB1 = 243k satisfies the range restrictions be-
low:
Rk
VV
VA
k
k
Rk
VV
V
V
B MAX
B MIN
1
1
49 9
10 01
10 01
3 0525
0 505
0 505
0 1
49 9
244 3
49 9
10 01
10 01
3 5475
0 250
0 665
0 665
0 1
()
()
.•
–.
.
•
.– .
..
•
.
.
.•
.
–.
•
..
– .
.– .
=
+


+µ


=
=
+


+
µµ


=
Ak
k
•.
.
49 9
241 6
Similar calculations for the 2.5V supply yield suitable
standard 1% values of RA2 = 49.9k and RB2 = 169k.
R
V
A
kk
Rk
VV
VA
k
k
Rk
V
A
B MAX
B MIN
2
2
2
0 500
10
50
49 9
49 9
10 01
10 01
2 3125
0 505
0 505
0 1
49 9
173 3
49 9
10 01
10 01
2 6875
=
µ
=≈
=
+


+µ


=
=
+


.
.
.•
–.
.
•
.– .
..
•
.
.
.•
.
–.
•
.
()
()
++
µ


=
0 150
0 665
0 665
0 1
49 9
167 6
.– .
.– .
•
.
.
VV
VA
k
k
Tie the unused V3 and V4 monitor pins to V2 for proper
operation.
2921/22 F12
RX0
100
Ω
RG0
10
Ω
LTC2921
VCC
SENSE
RX1
100
Ω
RX2
100
Ω
R2
4.7k
RA2
49.9k
1%
RA1
49.9k
1%
RB2
169k
1%
RB1
243k
1%
VOUT
VFB
VOUT
VFB
VOUT
VFB
RG1
10
Ω
RG2
10
Ω
V1
V2
V3
V4
S1
S2
S3
GATE
PG
D1
D2
D3
GND
TIMER
QRST
Si1012R
CBRST
5V = 7.5%
3.3V = 7.5%
2.5V = 7.5%
Q0
Si2316DS
Q1
Si2316DS
Q2
Si2316DS
RSENSE
WSL1206
0.05
Ω, 1%
CTIMER
0.22
µF
10V
5V
LOAD
0.8A MAX
3.3V
LOAD
1.6A MAX
2.5V
LOAD
0.4A MAX
RESET
CGATE
0.47
µF
25V
CD0
0.1
µF
25V
CD1
0.1
µF
25V
CD2
0.1
µF
25V
CBYP
10
µF
25V
DC/DC
CONVERTER
DC/DC
CONVERTER
DC/DC
CONVERTER
R1
100k
CIRCUIT BREAKER
RESET CONTROL
15
14
13
12
10
8
6
16
11
1
2
3
4
9
7
5
Figure 12. Design Example of a Three-Supply Tracker and Monitor (5V, 3.3V, 2.5V)



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