Crane Aerospace & Electronics Power Solutions
MFK Single and Dual DC-DC Converters
16 TO 50 VOLTS INPUT – 10 TO 25 WATT
FEATURES
• 16 to 50 volt input
• Up to 87% efficiency, 42 W/in
3
• Available to Class H, MIL-PRF-38534
• Undervoltage lockout
• -55°C to +125°C operation
• Fully isolated, magnetic feedback
• Fixed frequency, 500 kHz typical
• 80 volt transient protection per MIL-STD-704A
• Inhibit and sync function
• Indefinite short circuit protection
MODELS
O
utput
V
Oltage
(V)
SINGLE
1.8
2.5
3.3
5
5.2
5.7
12
15
28
DUAL
±5
±7
±12
±15
DESCRIPTION
The Interpoint® MFK Series™ of DC-DC converters offers up to 25
watts of power in a low profile package. The MFK converters are
manufactured in our fully certified and qualified MIL-PRF-38534
Class H production facility and packaged in hermetically sealed steel
cases. They are ideal for use in programs requiring high reliability,
small size, and high efficiency. The high frequency series offers a
wide input voltage range of 16 to 50 volts and up to 25 watts of
output power. The converters provide 80 volt transient protection per
MIL-STD-704A. The package is a hermetically sealed, welded metal
case. Flanged and non-flanged models are available.
A
uDio
r
ejeCtion AnD
F
iltering
The MFK converters current mode control system provides excellent
dynamic response and audio rejection. Audio rejection is typically 50
dB. Output voltage response for a 50% to 100% step load transient
is as low as 4% with a 400 µs recovery time.
The MFK Series converters are provided with internal filtering
capacitors that help reduce the need for external components in
normal operation. Use our FMCE-0328 EMI filter to meet
the requirements of MIL-STD-461C CE03 and CS01 and
MIL-STD-461D, E and F CE102 and CS101. Any of our Interpoint
FMCE filters can be used to the rated current of the filter.
C
onverter
D
esign
The MFK converters are switching regulators that use a quasi-
square wave, single-ended forward converter design with a constant
switching frequency of 500 kHz, typical. Isolation between input and
output circuits is provided with transformers in the power path and in
the feedback control loop.
At 0.360 inch high and a total footprint of 1.7 in
2
, this low profile
package offers a total power density of up to 42 watts per cubic
inch.
The dual models can be used as a single output voltage by
connecting the load between positive and negative outputs, leaving
the common unconnected, resulting in double the output voltage.
(for example, MFK2815D can be used as a 30 volt output.) When
using a dual to double the output voltage (span voltage) the
maximum load capacitance across the span voltage is half that
specified for each output.
i
nhibit AnD
s
ynChronizAtion
MFK converters provide an inhibit terminal that can be used to
disable internal switching, resulting in no output and very low
quiescent input current. The converter is inhibited when the inhibit
pin is pulled below 0.8 volts. The converter is enabled when the
pin, which is internally connected to a pull-up current source, is left
unconnected or is connected to an open-collector gate. The open
circuit voltage associated with the inhibit pin is 8.5 to 12 V. In the
inhibit mode, a maximum of 4 mA must be sunk from the inhibit pin.
A synchronization feature is included with the MFK Series that allows
the user to match the switching frequency of the converter to the
frequency of a system clock. Synchronization allows the user to
adjust the nominal 500 kHz operating frequency to any frequency
within the range of 450 kHz to 550 kHz. This is initiated by applying
an active high input of the desired frequency to the sync pin. See
Table 5 on page 6 for more information.
Crane Aerospace & Electronics
Power Solutions – Interpoint Products
16706 13th Avenue West, Lynnwood, WA 98037
+1 425.882.3100 • power@craneae.com
www.craneae.com/interpoint
Page 1 of 33
MFK Rev AN - 2020.04.17
Crane Aerospace & Electronics Power Solutions
MFK Single and Dual DC-DC Converters
16 TO 50
Volt input – 25
TO 25 WATT
28
VOLTS INPUT – 10
Watt
MODEL NUMBERING KEY
Base Model
Input Voltage
MFK
28 12
D
F / 883
5962-1421010HXC
5962-1421011HXC
5962-1421012HXC
5962-1421013HXC
5962-1421018HXC
5962-1421014HXC
5962-1421015HXC
5962-1421016HXC
5962-1421017HTC
5962-1421105HXC
5962-1421106HXC
5962-1421107HXC
5962-1421108HXC
SMD NUMBERS
S
tandard
M
icrOcircuit
d
rawing
(SMd)
MFK S
iMilar
p
art
MFK281R8S/883
MFK282R5S/883
MFK283R3S/883
MFK2805S/883
MFK285R2S/883
MFK285R7S/883
MFK2812S/883
MFK2815S/883
MFK2828S/883
MFK2805D/883
MFK2807D/883
MFK2812D/883
MFK2815D/883
Output Voltage
(R = decimal point, 3R3 = 3.3 Vout)
Number of Outputs
(S = single, D = dual)
Case Option
(Non-flanged case has no designator in
this position)
Screening
(Standard screening has no designator
in this position.)
F
igure
5: M
oDel
n
uMbering
k
ey
The SMD number shown is for Class H screening, non-flanged. To
indicate the flanged case option change the “X” to “Z” In the SMD
number (“T” to “U” for 28 single). For exact specifications for an SMD
product, refer to the SMD drawing. SMDs can be downloaded from:
https://landandmaritimeapps.dla.mil/programs/smcr
t
Able
3: sMD C
ross
r
eFerenCe
t
O deterMine the MOdel nuMber enter One OptiOn FrOM
each categOry in the FOrM belOw
.
CATEGORY
Base Model and
Input Voltage
Output Voltage
1
1R8, 2R5, 3R3, 05
Number of
Outputs
2
S
D
Case Options
3
(non-flanged, leave blank)
F (flanged)
/
Screening
4
(standard, leave blank)
ES
883
MODEL NUMBER OPTIONS
OPTIONS
FILL IN FOR
MODEL #
5
MFK28
5R2, 5R7, 12, 15, 28
05, 07, 12, 15
MFK28
Notes
1. Output Voltage: An R indicates a decimal point. 1R8 is 1.8 volts out. The values of 1.8, 2.5, 3.3 and 5.7 volts are only available in single output models.
2. Number of Outputs: S is a single output and D is a dual output.
3. Case Options: For the standard case, Figure 53 on page 28 or Figure 54 on page 29, leave the case option blank. For the flanged case option, Figure 55 on page 30
or Figure 56 on page 31, insert the letter F in the Case Option position.
4. Screening: For standard screening leave the screening option blank. For other screening options, insert the desired screening level. For more information see Table 14 on
page 32 and Table 15 on page 33.
5. If ordering by model number add a “-Q” to request solder dipped leads (MFK2805S/883-Q).
t
Able
4: M
oDel
n
uMber
o
Ptions
www.craneae.com/interpoint
Page 5 of 33
MFK Rev AN - 2020.04.17
MCU
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