LTC3717EGN Linear Technology, LTC3717EGN Datasheet - Page 16

• Manufacturer Part Number: LTC3717EGN
• Description: IC STEP-DWN CONTRLR SYNC 16-SSOP
• Manufacturer: Linear Technology

Specifications of LTC3717EGN

• Applications: Controller, DDR, QDR
• Voltage - Input: 4 ~ 36 V
• Number Of Outputs: 1
• Voltage - Output: 2 ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
LTC3717
• Flood all unused areas on all layers with copper. Flood-
When laying out a printed circuit board, without a ground
plane, use the following checklist to ensure proper opera-
tion of the controller. These items are also illustrated in
Figure 7.
• Segregate the signal and power grounds. All small
• Place M2 as close to the controller as possible, keeping
16
ing with copper will reduce the temperature rise of
power component. You can connect the copper areas to
any DC net (V
your system).
signal components should return to the SGND pin at
one point which is then tied to the PGND pin close to the
source of M2.
the PGND, BG and SW traces short.
BOLD LINES INDICATE HIGH CURRENT PATHS
IN
C
C
C
ION
SS
C1
, V
U
R
C
OUT
FB
C
, GND or to any other DC rail in
U
C
C2
R
ON
1
2
3
4
5
6
7
8
RUN/SS
PGOOD
V
I
SGND
I
V
V
TH
ON
W
RNG
FB
REF
LTC3717
EXTV
INTV
BOOST
PGND
V
Figure 7. LTC3717 Layout Diagram
SW
BG
TG
CC
CC
CC
U
16
15
14
13
12
11
10
9
C
VCC
C
D
B
B
C
F
• Connect the input capacitor(s) C
• Keep the high dV/dT SW, BOOST and TG nodes away
• Connect the INTV
• Connect the top driver boost capacitor C
• Connect the V
R
MOSFETs. This capacitor carries the MOSFET AC cur-
rent.
from sensitive small-signal nodes.
to the INTV
BOOST and SW pins.
the V
F
CC
M2
and PGND pins.
C
OUT
CC
D1
CC
D2
M1
and PGND pins.
L
pin decoupling capacitor C
CC
decoupling capacitor C
C
IN
3717F07
IN
+
–
–
+
close to the power
V
V
IN
OUT
B
closely to the
VCC
F
closely to
sn3717 3717fs
closely