LTC1435A Linear Technology, LTC1435A Datasheet - Page 16

• Manufacturer Part Number: LTC1435A
• Description: High Efficiency Low Noise Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

APPLICATIONS
LTC1435A
4. Does the (+) plate of C
5. Is the INTV
16
TYPICAL APPLICATIONS
topside MOSFET(s) as closely as possible? This capaci-
tor provides the AC current to the MOSFET(s).
between INTV
tor carries the MOSFET driver peak currents.
C
43pF
OSC
220pF
CC
C
C2
CC
decoupling capacitor connected closely
C
0.1 F
SS
and the power ground pin? This capaci-
U
R
C
C
C
SS
1000pF
C2
100pF
R
10k
C
50pF
C
1000pF
INFORMATION
C
U
IN
C
C
1
2
3
5
6
OSC
C1
connect to the drain of the
RUN/SS
C
I
SGND
V
TH
OSC
OSENSE
SENSE
7
1
2
3
4
5
6
7
8
LTC1435A
C
1000pF
RUN/SS
I
SFB
SGND
V
SENSE
SENSE
U
TH
–
OSC
OSENSE
W
SENSE
–
+
BOOST
INTV
LTC1435A
PGND
BG
8
SW
V
TG
CC
IN
+
Intel Mobile CPU VID Power Converter
Figure 10. LTC1435A Layout Diagram
13
16
14
12
15
11
10
+
EXTV
BOOST
INTV
U
PGND
CMDSH-3
SW
V
TG
BG
C
0.1 F
CC
CC
4.7
D
4.7 F
IN
F
B
0.22 F
16
15
14
13
12
11
10
9
R1
R2
4.5V TO 22V
V
IN
+
M2
Si4410
M1
Si4410
+
D
4.7 F
C
3.3 H
6. Keep the switching node SW away from sensitive small-
7. SGND should be exclusively used for grounding exter-
8. If operating close to the minimum on-time limit, is the
B
OUT
L1
signal nodes. Ideally the switch node should be placed
at the furthest point from the LTC1435A.
nal components on C
sense resistor oriented on the radial axis of the induc-
tor? See Figure 8.
0.1 F
D1
MBRS140T3
+
C
B
M1
C
10 F
30V
IN
2
R
L1
SENSE
BOLD LINES INDICATE
HIGH CURRENT PATHS
R
0.015
SENSE
M2
D1
C
IN
3
5
1435A TA07
V
FB
FROM P
0 1 2 3 GND
OSC
CC
7
LTC1706-19
VID
8
1
, I
2
SENSE
TH
4
, V
6
V
V
OUT
+
–
–
+
OSENSE
IN
+
1435A F10
C
820 F
4V
OUT
2
V
1.3V TO 2.0V
7A
and SFB pins.
OUT