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DEMO MANUAL DC2268A-F
performance summary
Table 1.
PARAMETER
Input Voltage Range
Output Voltage V
OUT1
Output Voltage V
OUT2
Per-Channel Maximum Continuous Output Current
Default Operating Frequency
Resistor Programmable Frequency Range
External Clock Sync. Frequency Range
Efficiency of Channel 1
Efficiency of Channel 2
Load Transient of Channel 1
Load Transient of Channel 2
Quick start proceDure
DC2268A-F is easy to set up to evaluate the performance
of the LTM4630A. It can be easily inserted to an edge
connector (SAMTEC MEC2-20-01-L-DV--TR) for testing
and debugging. Please refer to Figure 2 for proper mea-
surement setup and follow the procedure below:
1. Pull up the RUN1(J1 Pin 22) and RUN2(J1 Pin 24)
between 1.4V to 5V or leave them floating.
2. With power off, connect the input power supply, load
and meters as shown in Figure 2. Preset the load to 0A
and V
supply to 12V.
IN
3. Turn on the power supply at the input. The output volt-
age in channel 1 should be 3.3V ± 1.5% (3.2505V ~
3.3495V) and the output voltage in channel 2 should
be 2.5V ± 1.5% (2.4625V ~ 1.5375V),
2
Specifications are at T
CONDITIONS
V
= 4.5~15V, I
= 0A ~18A
IN
OUT1
V
= 4.5~15V, I
= 0A ~18A
IN
OUT2
De-rating is necessary for certain V
V
= 12V, V
= 3.3V, I
= 18A, f
IN
OUT1
OUT1
V
= 12V, V
= 2.5V, I
= 18A, f
IN
OUT2
OUT2
V
= 12V, V
= 3.3V, I
= 9A ~ 13.5A
IN
OUT1
STEP
V
= 12V, V
= 2.5V, I
= 9A ~ 13.5A
IN
OUT2
STEP
4. Once the proper output voltage is established, adjust
the load within the operating range and observe the
output voltage regulation, output voltage ripple, effi-
ciency and other parameters. Output ripple should be
measured at C
5. (Optional) LTM4630A can be synchronized to an exter-
nal clock signal. Remove R2 and apply a clock signal
(0V~5V, square wave) to MODE-PLLIN pin.
6. (Optional) LTM4630A can be configured for a 2-phase
single output at up to 36A on DC2268A-F . Install 0Ω
resistors on R26, R27, R28, R29, R32, and remove
R14, R18 R30. Output voltage is set by R7 based on
equation V
= 25°C
A
, V
and thermal conditions
IN
OUT
= 600kHz
SW
= 600kHz
SW
and C
.
o3
o4
= 0.6V (1 + 60.4k/R7).
OUT
VALUE
4.5V ~ 15V
3.3V ± 1.5%
2.5V ± 1.5%
18A (per channel)
600kHz
250kHz to 780kHz
400kHz to 780kHz
93.0%, see Figure 3
91.1%, see Figure 4
V
= 139mV, see Figure 5
OPP
V
= 102mV, see Figure 6
OPP
dc2268aff
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