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LTM4613
APPLICATIONS INFORMATION
V OUT(MARGIN) =
? V OUT
R PGM =
V OUT 1.18V
V OUT
( R fSET || 133k )
1.5 ? 10 ? 10
Table1.R FB Standard1%ResistorValuesvsV OUT
V OUT (V) 3.3 5 6 8 10 12 14 15
R FB (kΩ) 22.1 13.7 11 8.06 6.34 5.23 4.42 4.12
The MPGM pin programs a current that when multiplied
by an internal 10k resistor sets up the 0.6V reference ±
offset for margining. A 1.18V reference divided by the
R PGM resistor on the MPGM pin programs the current.
Calculate V OUT(MARGIN) :
%V OUT
100
Where %V OUT is the percentage of V OUT to be margined,
and V OUT(MARGIN) is the margin quantity in volts:
? ? 10k
0.6V V OUT(MARGIN)
Where R PGM is the resistor value to place on the MPGM
pin to ground.
The output margining will be ± margining of the value.
This is controlled by the MARG0 and MARG1 pins. See
the truth table below:
Operating Frequency
The operating frequency of the LTM4613 is optimized to
achieve the compact package size and the minimum
output ripple voltage while still keeping high efficiency.
As shown in Figure 2, the frequency is linearly increased
with larger output voltages to keep the low output cur-
rent ripple. Figure 3 shows the inductor current ripple ?I
with different output voltages. In most applications, no
additional frequency adjusting is required.
If lower output ripple is required, the operating frequency
f can be increased by adding a resistor R fSET between f SET
pin and SGND, as shown in Figure 19.
f =
1000
800
600
400
MARG1
MARG0
MODE
LOW
LOW
NO MARGIN
200
LOW
HIGH
HIGH
LOW
MARGIN UP
MARGIN DOWN
0
2
4
6
8
10
12
14
16
HIGH
HIGH
NO MARGIN
OUTPUT VOLTAGE (V)
4613 F02
Parallel Operation
The LTM4613 device is an inherently current mode con-
trolled device. This allows the paralleled modules to have
very good current sharing and balanced thermal on the
design. Figure 21 shows a schematic of the parallel design.
The voltage feedback equation changes with the variable
N as modules are paralleled. The equation:
Figure 2. Operating Frequency vs Output Voltage
9
8
7
6
5
4
V OUT
? 1
R F B =
100k
N
0.6V
3
2
1
0
2
4
V IN = 16V
V IN = 24V
V IN = 28V
V IN = 36V
6 8 10 12
OUTPUT VOLTAGE (V)
14
16
where N is the number of paralleled modules.
4613 F03
Figure 3. Pk-Pk Inductor Current Ripple vs Output Voltage
4613f
11
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