Datasheet

6
LTC1148
LTC1148-3.3/LTC1148-5
114835fd
+
–
1 P-DRIVE
14
3V
IN
12
PGND
N-DRIVE
R
S
Q
–
+
C
25mV TO 150mV
6
13k
I
TH
1.25V
10 5
REFERENCE
–
+
SHUTDOWN INTV
CC
V
OS
–
+
V
G
8
SENSE
+
9
ADJUSTABLE
VERSION
V
FB
100k
5pF
–
+
V
TH1
T
–
+
V
TH2
S
SLEEP
11
SGND
4
C
T
OFF-TIME
CONTROL
V
IN
SENSE
–
V
FB
SENSE
–
7
LTC1148 • FD
FU CTIO AL DIAGRA
UUW
Pin 9 connection shown for LTC1148-3.3 and LTC1148-5; changes create LTC1148.
TEST CIRCUIT
+
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
NC (V
FB
)
SENSE
+
1000pF
V
7
TO
V
8
+
V
10
R
SENSE
0.05Ω
75k
25k
100pF
+
V
OUT
440µF
50µH
1µF
IRFZ34
1N5818
330µF
+
IRF9Z34
+
V
IN
+
V
7
1k
3300pF10nF390pF
LTC1148
+