LTC1266 Linear Technology, LTC1266 Datasheet - Page 17

• Manufacturer Part Number: LTC1266
• Description: Synchronous Regulator Controller for N- or P-Channel MOSFETs
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
3. Are the Sense
4. Does the (+) plate of C
5. A 0.1 F to 1 F decoupling capacitor connected be-
TYPICAL APPLICATIO S
minimum PC trace spacing? The 1000pF capacitor
between Pins 8 and 9 should be as close as possible to
the LTC1266.
topside MOSFET as closely as possible? This capacitor
provides the AC current to the topside MOSFET.
tween V
IN
(Pin 5) and ground is optional, but is some-
–
and Sense
*
BINH
DALE LPT4545-A001
COILTRONICS CTX10-4
U U
C
220pF
T
IN
connect to the source of the
+
+
R
1k
leads routed together with
C
C
3300pF
1 F
C
Figure 11. Low Dropout, 3.3V/3A High Efficiency Regulator
U
W
1
2
3
4
5
6
7
8
(Layout Assist Schematics)
TDRIVE
PWR V
PINV
BINH
V
C
I
SENSE
TH
IN
T
LTC1266-3.3
IN
–
1000pF
U
SENSE
BDRIVE
LB
PGND
SGND
SHDN
LB
OUT
NC
IN
+
16
15
14
13
12
11
10
9
SHUTDOWN
6. Is the Shutdown (Pin 11) actively pulled to ground
times helpful in eliminating instabilities at high input
voltage and high output loads.
during normal operation? The Shutdown pin is high
impedance and must not be allowed to float. The Select
(Pins 3 and 4) are also high impedance and must be tied
high or low depending on the application.
Si9410DY
Si9430DY
L*
10 H
R
0.033
LTC1266-3.3/LTC1266-5
SENSE
(V
IN(MIN)
D1
MBRS140T3
+
= 3.5V IF I
C
220 F
10V
2
V
3.3V
3A
3.9V TO 18V
OUT
OUT
+
V
IN
LTC1266 • F11
LOAD
C
100 F
25V
IN
< 0.8A)
LTC1266
17