LTC3370EUH Datasheet, PDF (5/10 Pages) Linear Technology – 4-Channel 8A Configurable Buck DC/DCs

DEMO MANUAL DC2311A
Modifying the DC2311A to Other Power Configurations
The LTC3370 can be configured to one of eight different
power configurations as shown in Table 1. To reconfigure
the DC2311A to a different configuration some resistors
will need to be changed, traces will need to be shorted
together, and often traces will need to be cut. Follow the
steps below to modify the board to a desired configuration.
1. Choose the desired configuration from Table 1.
Table 1. Master Slave Program Combinations (Each Letter
Corresponds to a V_IN and SW Pair)
PROGRAM
CODE
C3C2C1
BUCK 1
BUCK 2
BUCK 3
BUCK 4
000
AB
CD
EF
GH
001
ABC
D
EF
GH
010
ABC
D
E
FGH
011
ABCH
D
E
FG
100
ABC
DE
Not Used
FGH
101
ABCD Not Used
EF
GH
110
ABCD Not Used
E
FGH
111
ABCD Not Used Not Used EFGH
2. Set the associated C bit pins high or low as per Table 1
by opening and shorting the appropriate resistors. C1,
C2, and C3 are set high by shorting R7, R11, and R14
respectively. C1, C2, and C3 are set low by shorting
R9, R13, and R16 respectively. The C bit resistors are
0603 resistors located on the bottom of the board as
shown in Figure 3.
Figure 3. C Bit Resistors and Optional Output
Capacitors for V_OUT1 and V_OUT4
3. The DC2311A is set up with the following power stage
switch nodes and V_IN nodes connected together; A &
B, C & D, E & F, and G & H. Any configuration using
1A or 3A regulators will require one or more of the V_IN
and switch nodes to be separated. Refer to Table 1 to
determine which power stages are connected together
and separated. Cut the required V_IN nodes by cutting
the V_IN traces on the bottom of the board near the V_IN
terminals as shown in Figure 4.
Figure 4. Separate V_IN Pairs by Cutting Traces at Terminals
dc2311af
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