LTC1142CG#PBF Linear Technology, LTC1142CG#PBF Datasheet - Page 19

• Manufacturer Part Number: LTC1142CG#PBF
• Description: IC SW REG STEP-DOWN DUAL 28-SSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1142CG#PBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 3.3V, 5V
• Current - Output: 50mA
• Frequency - Switching: 250kHz
• Voltage - Input: 3.5 ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

C
220 F
TYPICAL APPLICATIO S
R
R
L1: COILTRONICS CTX50-4
L2: COILTRONICS CTX25-4
OUT1
3.3V/2A
10V
SENSE1
SENSE2
V
OUT3
: KRL SL-C1-1/2-1R100J
: KRL SL-C1-1/2-1R050J
+
R
R
L1: COILTRONICS CTX33-4
T1: DALE LPE-6562-A026
PRIMARY: SECONDARY = 1:1.8
R
49.9k
274k
SENSE3
SENSE5
SENSE1
0.1
D3
MBRS340T3
1%
1%
R2
R1
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
MBRS140T3
FROM WALL ADAPTER
Figure 15. LTC1142HV-ADJ High Efficiency Power Supply Providing 3.3V/2A with Built-In Battery Charger
>3V = 12V ON
0V = 12V OFF
12V ENABLE
MBRS140T3
33 H
50 H
8V TO 18V
22 F
(6V MAX)
100pF
L1
25V
L1
D1
V
2
IN
+
D1
C
22 F
35V
IN1
+
2
0.01 F
N-CH
Si9410DY
P-CH
Si9430DY
“1” FOR TRICKLE CHARGE
N-CH
Si9410DY
1000pF
P-CH
Si9430DY
12V/150mA
Figure 14. LTC1142 Triple Output Regulator with Switched 12V Output
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
23
28
1
6
22 F
U
28
25V
23
1
2
6
+
SENSE
PDRIVE 3
SENSE
NDRIVE 3
PGND3 SGND3 C
V
SENSE
PDRIVE 1
SENSE
NDRIVE 1
PGND1 SGND1 C
+
V
IN3
4
V
FB1
24
IN1
+
–
5
24
3
3
+
–
VN2222LL
1
1
>1.5V = CHARGE OFF
0V = CHARGE ON
3
4
SHDN3
20pF
SHDN1
T3
25
2
C
390pF
T1
T3
25
3
C
200pF
T1
0V = NORMAL
>1.5V = SHDN
I
TH3
R3
649k
1%
R4
294k
1%
27
LTC1142HV-ADJ
51
27
C
3300pF
I
LTC1142
R
R
510
TH1
C3
X
C3
2
C
3300pF
R
1k
C1
C1
I
ADJ
TH5
13
C
3300pF
R
510
C5
>1.5V = 3.3V OUTPUT OFF
C5
I
SHDN5
TH2
0V = OUTPUT ON
C
LTC1142/LTC1142L/LTC1142HV
LT1121
V
13
C
3300pF
GND
R
1k
T5
OUT
C2
11
16
C
200pF
C2
SHUTDOWN
3
1
T5
17
SHDN2
C
SGND5 PGND5
T2
11
C
330pF
T2
17
V
SGND2 PGND2
IN
NDRIVE 5
PDRIVE 5
SENSE
SENSE
8
V
5
18
IN5
NDRIVE 2
PDRIVE 2
SENSE
SENSE
18
10
+
–
+
5
5
V
FAST CHARGE = 130mV/R
TRICKLE CHARGE = 130mV/R
IN2
V
15
14
9
20
10
19
FB2
+
–
2
2
1 F
15
14
16
D3
MBRS140T3
9
20
Si9430DY
Si9410DY
1000pF
0.22 F
N-CH
P-CH
Si9433DY
Si9410DY
1000pF
P-CH
N-CH
+
22
1000pF
SENSE1
D2
MBRS140T3
22 F
25V
SENSE1
D2
MBRS140T3
30 H
100
2
T1
= 1.3A
100pF
= 100mA
25 H
L2
R1,100
VN2222LL
+
R
R5
18k
220 F
0.04
SENSE5
10V
C
22 F
25V
2
IN2
2
+
22 F
R
35V
0.05
SENSE2
C9
R4
84.5k
1%
R3
51k
1%
+
+
19
1142 F14
V
4 CELLS
NiCAD
V
5V/2A
C
220 F
10V
1142 F15
BATT
V
3.3V/2A
OUT5
OUT2
2
OUT2