LTC1559CGN-3.3 데이터 시트보기 (PDF) - Linear Technology
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LTC1559CGN-3.3 Datasheet PDF : 20 Pages
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LTC1559-3.3/LTC1559-5
TYPICAL APPLICATION
LTC1559-3.3 Backup System with an LTC1435 Main System Regulator (LTC1435 Output Sense at the Drain of Q11)
L11†
22µH
BACKUP + C11
18
R14
14k
BATTERY
1.2V
1µF
SW VBAK 7
6.3V
VCC
NiCd
3
CTL
+
C12
R15
RESET
LTC1559-3.3
2
5
1µF
100k
PUSH-BUTTON
GND RESET
4
6
PS BACKUP
RESET
BACKUP
MAIN
BATTERY
4.5 TO 28V
+ CIN
22µF
35V
×2
CC
330pF
CC2
51pF
CSS
0.1µF
RC
10k
13 16
9
VIN
EXTVCC
TG
14
SW
4 SFB
BOOST 15
LTC1435
6
12
VOSENSE INTVCC
3
ITH
SENSE + 8
2 RUN/SS SENSE – 7
D1
C4
CMDSH-3 0.1µF
C5
1000pF
1
COSC
SGND
5
BG
PGND
10
11
+
C3
4.7µF
16V
COSC
68pF
Q1
N-CHANNEL
Si4412DY
Q2
N-CHANNEL
Si4412DY
C2
0.1µF
L1*
10µH
RSENSE**
0.033Ω
C6
D2
100pF
MBRS140T3
C1
100pF
Q11
P-CHANNEL
Si9424Y
+ COUT
+
100µF
10V
×2
R1
35.7k
1%
MAIN
OUTPUT
3.3V
BACKUP
OUTPUT
3.3V
C15
100µF
10V
*SUMIDA CDRH125-10
R5
**IRC LR2010-01-R033-F
20k
†SUMIDA CD54-220
1%
1559 TA03
Description
The PS pin connects to Q11’s drain and allows the LTC1559
to detect the restoration of the main battery during backup
mode. Once the LTC1435’s output is greater than VOUT
during backup mode, the LTC1559 deasserts its BACKUP
pin and returns control back to the LTC1435. Q11 turns on
and allows the LTC1435 to charge C15. Please refer to the
Applications Information section for more details.
16
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