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LTC3374 Datasheet, PDF (19/24 Pages) Linear Technology – 8-Channel Parallelable 1A Buck DC/DCs
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LTC3374
APPLICATIONS INFORMATION
2. All the input supply pins should each have a decoupling
capacitor.
3. The connections to the switching regulator input supply
pins and their respective decoupling capacitors should
be kept as short as possible. The GND side of these
capacitors should connect directly to the ground plane
of the part. These capacitors provide the AC current
to the internal power MOSFETs and their drivers. It is
important to minimize inductance from these capacitors
to the VIN pins of the LTC3374.
4. The switching power traces connecting SW1, SW2, SW3,
SW4, SW5, SW6, SW7, and SW8 to their respective
inductors should be minimized to reduce radiated EMI
and parasitic coupling. Due to the large voltage swing
of the switching nodes, high input impedance sensitive
nodes, such as the feedback nodes, should be kept far
away or shielded from the switching nodes or poor
performance could result.
5. The GND side of the switching regulator output capaci-
tors should connect directly to the thermal ground plane
of the part. Minimize the trace length from the output
capacitor to the inductor(s)/pin(s).
6. In a combined buck regulator application the trace length
of switch nodes to the inductor must be kept equal to
ensure proper operation.
3.3V TO 5.5V
3.0V TO 5.5V
2.5V TO 5.5V
2.25V TO 5.5V
10µF 3.3V
1A
10µF 3.0V
1A
10µF 2.5V
1A
10µF 2.0V
1A
VIN1
2.2µH
SW1
22µF 1.02M
FB1
324k
VIN8
2.2µH
SW8
FB8
806k
649k
1.8V
1A
22µF
VIN2
2.2µH
SW2
VIN7
2.2µH
SW7
22µF 1.0M
715k
FB2
FB7
365k
806k
LTC3374
VIN3
2.2µH
SW3
22µF 1.02M
FB3
475k
VIN6
2.2µH
SW6
FB6
232k
464k
1.5V
1A
22µF
1.2V
1A
22µF
VIN4
2.2µH
SW4
22µF 1.0M
FB4
665k
VIN5
2.2µH
SW5
FB5
255k
1.02M
1.0V
1A
22µF
2.25V TO 5.5V
10µF
2.25V TO 5.5V
10µF
2.25V TO 5.5V
10µF
2.25V TO 5.5V
10µF
MICROPROCESSOR
CONTROL
402k
EN1
EN2
EN3
EN4
EN5
EN6
EN7
EN8
SYNC
MODE
RT
VCC
PGOOD_ALL
TEMP
EXPOSED PAD
3374 F03
2.7V TO 5.5V
10µF
MICROPROCESSOR
CONTROL
Figure 3. Detailed Front Page Application
For more information www.linear.com/LTC3374
3374f
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