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| LTC3412A Datasheet, PDF (15/20 Pages) Linear Technology – 3A, 4MHz, Monolithic Synchronous Step-Down Regulator | |||
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LTC3412A
APPLICATIO S I FOR ATIO
3. Keep the switching node, SW, away from all sensitive
small signal nodes.
4. Flood all unused areas on all layers with copper. Flood-
ing with copper will reduce the temperature rise of power
components. You can connect the copper areas to any DC
net (PVIN, SVIN, VOUT, PGND, SGND, or any other DC rail
in your system).
5. Connect the VFB pin directly to the feedback resistors.
The resistor divider must be connected between VOUT
and SGND.
Top
Bottom
Figure 3. LTC3412A Layout Diagram
CFF 22pF X5R
R1 392k
VIN
3.3V
CIN3**
100μF
1 SVIN
PVIN 16
RPG
PGOOD
100k
2 PGOOD
SW 15
CITH 330pF X7R RITH
17.4k
CC
47pF
R3
R2
115k
69.8k
3
ITH
4
VFB
5 RT
14
SW
LTC3412A
EFE PGND 13
PGND 12
RSS
ROSC
294k
6 SYNC/MODE
SW 11
2.2M
CSS
7 RUN
SW 10
1000pF X7R 8 SGND
9
PVIN
CIN1
22μF
L1*
0.47μH
VOUT
2.5V
3A
CIN2
22μF
X5R 6.3V
COUT**
100μF
Ã2
GND
*VISHAY IHLP-2525CZ-01
**TDK 4532X5R0J107M
3412 F04
Figure 4. 3.3V to 2.5V, 3A Regulator at 1MHz, Burst Mode Operation
3412afc
15
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