Datasheet

18
LTC1148
LTC1148-3.3/LTC1148-5
114835fd
TYPICAL APPLICATIO S
U
1
2
3
4
5
6
7
14
13
12
11
10
9
8
P-DRIVE
NC
V
IN
C
T
INTV
CC
I
TH
SENSE
–
N-DRIVE
NC
PGND
SGND
SHUTDOWN
V
FB
SENSE
+
LTC1148
1µF
0.1µF
R
SENSE
**
0.082Ω
SHUTDOWN
L2
50µH
+
V
IN
4V TO 14V
V
OUT
5V/1A
C
C
3300pF
R
C
1k
C
T
390pF
LTC1148 • F16
Si4435DY
C
IN
100µF
20V
100pF
+
220µF*
10V
OS-CON
D1
MBRS140T3
R1
25k
1%
R2
75k
1%
+
C
OUT
220µF
10V
OS-CON
L1
50µH
*LOW ESR REQUIRED
**KRL NP-1A-C1-0R082J
Si4412DY
V
OUT
1N4148
+
Figure 16. 4V to 14V Input Voltage to 5V/1A Regulator with Current Foldback
1
2
3
4
5
6
7
14
13
12
11
10
9
8
P-DRIVE
NC
V
IN
C
T
INTV
CC
I
TH
SENSE
–
N-DRIVE
NC
PGND
SGND
SHUTDOWN
V
FB
SENSE
+
LTC1148
1µF
1000pF
R
SENSE
**
0.05Ω
SHUTDOWN
*L
50µH
NDS9410A
D1
MBRS140T3
+
V
IN
5.2V TO 14V
+
C
OUT
220µF
10V
×2
OS-CON
V
OUT
3.3V/2A
OR 5V/2A
C
C
3300pF
R
C
1k
C
T
390pF
*COILTRONICS CTX50-2-MP
**KRL SL-1-C1-0R050R
LTC1148 • F17
10nF
NDS9435A
C
IN
100µF
20V
100pF
R1B
43k
1%
R2
56k
1%
R1A
33k
1%
VN2222LL
0V: V
OUT
= 3.3V
5V: V
OUT
= 5V
+
Figure 17. Logic Selectable 5V/1A or 3.3V/1A High Efficiency Regulator