LTC1142-ADJ Linear Technology, LTC1142-ADJ Datasheet - Page 19

• Manufacturer Part Number: LTC1142-ADJ
• Description: Dual High Efficiency Synchronous Step-Down Switching Regulators
• Manufacturer: Linear Technology

TYPICAL APPLICATIONS
C
220 F
R
R
L1: COILTRONICS CTX50-4
L2: COILTRONICS CTX25-4
OUT1
10V
SENSE1
SENSE2
3.3V/2A
V
OUT3
: KRL SL-C1-1/2-1R100J
: KRL SL-C1-1/2-1R050J
+
49.9k
274k
R
R
L1: COILTRONICS CTX33-4
T1: DALE LPE-6562-A026
R
D3
MBRS340T3
1%
1%
SENSE3
SENSE5
R2
R1
SENSE1
0.1
R
+
0.05
SENSE3
V
6.5V TO
14V
100 F
10V
IN
: KRL SL-C1-1/2-0R050J
: KRL SL-C1-1/2-0R040J
2
FROM WALL ADAPTER
Figure 15. LTC1142HV-ADJ High Efficiency Power Supply Providing 3.3V/2A with Built-In Battery Charger
MBRS140T3
>3V = 12V ON
0V = 12V OFF
12V ENABLE
MBRS140T3
8V TO 18V
33 H
100pF
22 F
(6V MAX)
50 H
L1
25V
L1
V
D1
2
IN
+
D1
C
22 F
35V
IN1
2
+
P-CH
Si9430DY
0.01 F
N-CH
Si9410DY
N-CH
Si9410DY
“1” FOR TRICKLE CHARGE
1000pF
P-CH
Si9430DY
12V/150mA
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
0.22 F
1 F
Figure 14. LTC1142 Triple Output Regulator with Switched 12V Output
28
U
23
1
6
22 F
23
28
25V
1
2
6
PRIMARY: SECONDARY = 1:1.8
+
SENSE
PDRIVE 3
SENSE
NDRIVE 3
PGND3 SGND3 C
PDRIVE 1
SENSE
SENSE
V
V
NDRIVE 1
PGND1 SGND1 C
+
IN3
V
FB1
4
N
IN1
24
5
24
+
–
3
+
3
–
VN2222LL
1
1
>1.5V = CHARGE OFF
0V = CHARGE ON
SHUTDOWN 3
3
SHUTDOWN 1
4
20pF
T3
T1
25
C
390pF
2
25
3
C
200pF
>1.5V = SHUTDOWN
T3
T1
0V = NORMAL
I
27
LTC1142HV-ADJ
TH3
51
R3
649k
1%
R4
294k
1%
I
R
TH1
LTC1142
27
C
3300pF
R
510
X
C3
C
3300pF
C3
R
1k
2
C1
C1
ADJ
I
TH5
13
C
3300pF
>1.5V = 3.3V OUTPUT OFF
SHUTDOWN 5
R
510
0V = OUTPUT ON
C5
C5
I
TH2
13
C
3300pF
LTC1142/LTC1142L/LTC1142HV
C
R
1k
LT1121
V
GND
SHUTDOWN 2
C2
T5
C2
OUT
11
16
C
200pF
SHUTDOWN
3
1
T5
17
C
T2
SGND5 PGND5
11
C
330pF
T2
SGND2 PGND2
17
V
IN
NDRIVE 5
PDRIVE 5
SENSE
SENSE
18
8
V
5
PDRIVE 2
NDRIVE 2
IN5
SENSE
SENSE
18
10
+
–
V
+
5
5
FAST CHARGE = 130mV/R
TRICKLE CHARGE = 130mV/R
IN2
V
10
19
FB2
15
14
9
20
+
–
2
2
1 F
15
14
16
20
9
D3
MBRS140T3
Si9430DY
Si9410DY
0.22 F
1000pF
Si9410DY
N-CH
Si9433DY
P-CH
1000pF
N-CH
P-CH
+
22
SENSE1
1000pF
D2
MBRS140T3
SENSE1
D2
MBRS140T3
22 F
25V
30 H
100
2
T1
= 1.3A
25 H
L2
100pF
= 100mA
+
VN2222LL
R
R5
18k
220 F
0.04
SENSE5
100
R1
10V
C
22 F
25V
R
0.05
2
IN2
SENSE2
2
22 F
+
35V
R4
84.5k
1%
R3
51k
1%
C9
+
+
19
1142 F14
V
4 CELLS
NiCAD
C
220 F
10V
1142 F15
V
5V/2A
BATT
V
3.3V/2A
OUT2
2
OUT5
OUT2