LTC1148HV Linear Technology, LTC1148HV Datasheet - Page 6

• Manufacturer Part Number: LTC1148HV
• Description: High Efficiency Synchronous Step-Down Switching Regulators
• Manufacturer: Linear Technology

FU CTIO AL DIAGRA
LTC1148
LTC1148-3.3/LTC1148-5
6
TEST CIRCUIT
U
SLEEP
SGND
S
11
U
+
–
390pF
V
TH2
10nF
C
4
+
T
V
TH1
V
IN
1k
3300pF
–
+
+
Q
W
OFF-TIME
CONTROL
T
+
V
R
S
7
1 F
Pin 9 connection shown for LTC1148-3.3 and LTC1148-5; changes create LTC1148.
1
2
3
4
5
6
7
V
SENSE
V
IN
FB
P-DRIVE
NC
V
C
INTV
I
SENSE
TH
IN
T
–
CC
LTC1148
–
SHUTDOWN
N-DRIVE
NC (V
SENSE
PGND
SGND
14
12 PGND
1000pF
3 V
1 P-DRIVE
NC
FB
+
C
)
N-DRIVE
IN
I
TH
–
+
14
13
12
11
10
9
8
6
25mV TO 150mV
+
–
V
10
+
+
13k
SHUTDOWN
V
TO
V
50 H
7
8
IRF9Z34
R
0.05
10
SENSE
V
G
–
+
–
+
REFERENCE
25k
75k
1N5818
IRFZ34
SENSE
1.25V
8
V
OS
+
ADJUSTABLE
100pF
VERSION
5
V
+
+
FB
9
INTV
330 F
440 F
CC
SENSE
V
OUT
7
100k
–
LTC1148 • FD
5pF