LTC1143 Linear Technology, LTC1143 Datasheet - Page 16

• Manufacturer Part Number: LTC1143
• Description: Dual High Efficiency SO-16 Step-Down Switching Regulator Controllers
• Manufacturer: Linear Technology

APPLICATIONS
LTC1143/LTC1143L
LTC1143L-ADJ
5) Is the V
6) For the LTC1143 and LTC1143L, are the SHUT-
16
nected closely between Pin 13 (5) and GND Pin 3
(11)? This capacitor carries the MOSFET driver peak
currents.
DOWN Pins 2 and 10 actively pulled to ground
during normal operation? Both SHUTDOWN pins are
V
V
IN5
+
–
–
OUT3
+
*MUST BE LOCATED CLOSE TO LTC1143
BOLD LINES INDICATE HIGH CURRENT PATHS
IN
C
T3
decoupling capacitor (1 F, 0.1 F) con-
U
+
1k
C
0.0033 F
OUT3
INFORMATION
R
SENSE3
U
Figure 9. LTC1143 Layout Diagram (see Board Layout Checklist)
+
W
0.22 F*
C
1000pF*
IN5
L2
(3.3V OUTPUT)
SHUTDOWN
U
P-CH
D2
V
IN3
V
P-CH
IN5
7) For the LTC1143L-ADJ, are the V
high impedance and must not be allowed to float. Both
pins can be driven by the same external signal if
needed.
decoupled with 100pF as close to the device as
possible? The V
should be kept away from the P-channel MOSFET.
SHUTDOWN
(5V OUTPUT)
C
D1
T5
L1
+
1k
0.0033 F
C
IN3
FB
1000pF*
0.22 F*
line is sensitive to noise pickup and
R
SENSE5
+
C
OUT5
FB
Pins 2 and 10
1143 F09
V
+
–
IN3
V
–
+
OUT5