The Interpoint™ MCH Series™ and MGH Series™ of dc-dc
converters deliver 1.5 watts of output power while saving
significant board real estate. The wide input voltage range of 12
to 50 VDC accepts the varying voltages of military, aerospace, or
space bus power and tightly regulates output voltages to protect
downstream components. Transient protection of 80 volts for up
to 120 milliseconds exceeds the requirements of MIL-STD-704A
for the 5 and 12 volt single models and the 12 volt dual model.
The 15 volt single and dual converters will withstand transients of
up to 70 volts for up to 120 milliseconds.
The converters are offered with standard screening, “ES”
screening, or fully compliant to “883” MIL-PRF-38534 Class H
screening. See “Table 11: Element Evaluation” on page 12 and
“Table 12: Environmental Screening” on page 13. Standard
microcircuit drawings (SMD) are available. See “Table 5:
MCH SMD Numbers” on page 4 and “Table 6: MGH SMD
Numbers” on page 4.
Dual models regulate the negative output with magnetic coupling
to the positive output. Up to 80% of the total load may be on
one output providing that the other output carries a minimum of
20% of the total load. The dual models can be used at double
the output voltage by connecting the load between positive and
negative outputs, leaving the common unconnected.
(ex: MCH2805D can be used as a 10 VDC output.)
i
nhibit
F
unCtion
C
onverter
D
esign
MCH and MGH converters provide an inhibit terminal that can be
used to disable internal switching, resulting in no output voltage
and an input current as low as 2.3 mA. The converter is inhibited
when the inhibit pin is pulled below 0.8 V and enabled when its
inhibit pin is left floating. An external inhibit interface should be
capable of pulling the converter’s inhibit pin below 0.8 V while
sinking the maximum inhibit current and also allowing the inhibit
pin to float high to enable the converter. A voltage should not be
applied to the inhibit pin. The open circuit voltage present on the
inhibit pin is 7 to 12 V.
MCH Series and MGH Series of dc-dc converters incorporate a
continuous flyback topology with a constant switching requency
f
of approximately 370 kHz. Current-mode pulse width modulation
(PWM) provides output voltage regulation. Output error voltage
is magnetically fed back to the input side of the PWM to regulate
output voltage. Regulation is also affected by the load; refer
to the Electrical Characteristics Table 9 on page 6 and
Table 10 on page 7.
P
roteCtion
F
eatures
Undervoltage lockout prevents the converters from operating
below approximately 8 VDC input voltage to keep system
current levels smooth, especially during initialization or re-start
operations. All models include a soft-start function to prevent
large current draw and minimize overshoot. The converters also
provide short circuit protection by restricting the current.
MiL-stD-461
Use the Interpoint FMSA-461 (down-leaded) or FMGA-461
(surface mount, side-leaded) EMI filters to pass the CE03
requirements of MIL-STD-461C.
Crane Aerospace & Electronics
Power Solutions – Interpoint Products
10301 Willows Rd. NE, Redmond, WA 98052
+1.425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint
MCH_MGH Rev AB - 2013.05.31
Page 1 of 13
Crane Aerospace & Electronics Power Solutions
MCH/MGH Single and Dual DC-DC Converters
28 Volt input – 1.5 Watt
P
aCkaging
MCH - Down-leaded package
The MCH Series converters are packaged in hermetically sealed,
projection-welded metal cases which provide EMI/RFI shielding.
See “Figure 21: MCH Case Dimensions” on page 10.
MGH - Surface mount package
The surface mount MGH dc-dc converters can be mounted with
pick-and-place equipment or manually. It is recommended that
the case be attached with flexible epoxy adhesive or silicone
which is thermally conductive (>1 watt /meter/°K).
Internal components are soldered with SN96 (melting
temperature 221°C) to prevent damage during reflow. Maximum
reflow temperature for surface mounting the MGH converter is
220°C for a maximum of 30 seconds. SN60, 62, or 63 are the
recommended types of solder. Hand soldering should not exceed
300°C for 10 seconds per pin.
The hermetically sealed metal cases are available in two different
lead configurations. See “Figure 22: MGH Case Dimensions” on
page 11 and “Figure 23: MGH Gull-Wing Solder Pad Layout”
on page 11.
Positive
Input
+
+Vin
FB
+Vout
Positive
Output
Inhibit
Shutdown
PWM
Controller
+
+
Input
Common
Case
Ground
Output
Common
Negative
Output
Dual models only
F
igure
1: MCh/Mgh b
LoCk
D
iagraM
www.interpoint.com
MCH_MGH Rev AB - 2013.05.31
Page 2 of 13
Crane Aerospace & Electronics Power Solutions
MCH/MGH Single and Dual DC-DC Converters
28 Volt input – 1.5 Watt
Pin
1
2
3
4
5
6
7
PIN Out MCH MODels
single Output
Positive Input
Input Common
Positive Output
Output Common
Case Ground
No Connection
Inhibit
Dual Output
Positive Input
Input Common
Positive Output
Output Common
Pin
1
2
3
4, 5
6, 7
8, 9
10, 11
12
13, 14
15, 16, 17
18
PIN Out MGH MODels
single Output
Positive Input
No Connection
Input Common
Positive Output
Case Ground
Output Common
Case Ground
No Connection
No Connection
No Connection
Inhibit
Dual Output
Positive Input
No Connection
Input Common
Positive Output
Case Ground
Output Common
Case Ground
No Connection
Negative Output
No Connection
Inhibit
Case Ground
Negative Output
Inhibit
t
abLe
1: MCh P
in
o
ut
To meet specified performance for the MGH, all pins must be
connected except “No connection” pins and Inhibit pin.
t
abLe
2: Mgh P
in
o
ut
Squared corner and dot on
top of cover indicate pin one.
1 2
BOTTOM
VIEW MCH
6
3
4
7
5
1
2
3
4
5
6
7
8
9
TOP VIEW
MGH
18
17
16
15
14
13
12
11
10
See case A2 for dimensions.
Differently colored glass bead around pin one or dimple in
header (bottom or side of case) indicates pin one.
Cover marking is oriented with pin one at the upper right corner.
F
igure
2: MCh P
in
o
ut
See case B for dimensions and “gull-wing” option.
F
igure
3: Mgh P
in
o
ut
Inhibit
MCH PINs NOt IN use
Leave unconnected
Leave unconnected
Inhibit
MGH PINs NOt IN use
Leave unconnected
Connect to case ground for best
EMI performance. Also ok to
leave unconnected.
“No Connection” pin
“No Connection” pins
t
abLe
3: MCh P
ins not in
u
se
t
abLe
4: Mgh P
ins not in
u
se
www.interpoint.com
MCH_MGH Rev AB - 2013.05.31
Page 3 of 13
Crane Aerospace & Electronics Power Solutions
MCH/MGH Single and Dual DC-DC Converters
28 Volt input – 1.5 Watt
S
tanDarD
M
iCrOCirCuit
D
rawing
(SMD)
5962-9569601HxC
5962-9569701HxC
5962-9569801HxC
5962-9570201HxC
5962-9570301HxC
5962-9570401HxC
sMD NuMbers
MCH S
iMilar
p
art
S
tanDarD
M
iCrOCirCuit
D
rawing
(SMD)
5962-9569601HZC
5962-9569701HZC
5962-9569801HZC
5962-9570201HZC
5962-9570301HZC
5962-9570401HZC
sMD NuMbers
MgH S
iMilar
p
art
MCH2805S/883
MCH2812S/883
MCH2815S/883
MCH2805D/883
MCH2812D/883
MCH2815D/883
MGH2805SZ/883
MGH2812SZ/883
MGH2815SZ/883
MGH2805DZ/883
MGH2812DZ/883
MGH2815DZ/883
For exact specifications for an SMD product, refer
to the SMD drawing. SMDs can be downloaded
from: http://www.dscc.dla.mil/programs/smcr
t
abLe
5: MCh sMD n
uMbers
For exact specifications for an SMD product, refer
to the SMD drawing. SMD numbers are shown for
the surface mount gull-wing case. For the straight-
lead case, replace the Z (HZC)in the SMD with a Y
(HYC). SMDs can be downloaded from: http://www.
dscc.dla.mil/programs/smcr
t
abLe
6: Mgh sMD n
uMbers
MODel NuMberING key
Base Model
Input Voltage
MCH
28 12 D / 883
MODel NuMberING key
Base Model
Input Voltage
MGH
28 12 S
Z / ES
Output Voltage
(R = decimal point, 3R3 = 3.3 Vout)
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
Output Voltage
Number of Outputs
(S = single, D = dual)
Gull Wing Lead Option
(Straight leaded case has no designator
in this position.)
Screening
(Standard screening has no designator
in this position.)
F
igure
4: MCh M
oDeL
n
uMbering
k
ey
F
igure
5: Mgh M
oDeL
n
uMbering
k
ey
t
O
CateGOry
DeterMine tHe MODel nuMber enter One OptiOn frOM eaCH CategOry in tHe fOrM belOw
.
base Model and
Input Voltage
MCH
MGH
Output Voltage
05, 12, 15
05, 12, 15
Number of
Outputs
1
S
D
Case Options
2
MCH – down-leaded: leave blank
MGH – straight leads: leave blank
MGH – gull wings: Z
__________
M H
__________
/
screening
3
(standard, leave blank)
ES
883
MODel NuMber OPtIONs
OPtIONs
FIll IN FOr
MODel #
Notes:
1. Number of Outputs: S is a single output and D is a dual output
2. Case Options: For the standard case MCH down-leaded case leave the case option blank. For the MGH straight-lead case, leave the case option blank. For the MGH,
surface mount gull-wing case, insert the letter “Z” in the case option position.
3. Screening: For standard screening leave the screening option blank. For other screening options, insert the desired screening level. For more information see
“Table 11: Element Evaluation” on page 12 and “Table 12: Environmental Screening” on page 13.
www.interpoint.com
t
abLe
7: MCh/Mgh sMD M
oDeL
n
uMber
o
Ptions
MCH_MGH Rev AB - 2013.05.31
Page 4 of 13
Crane Aerospace & Electronics Power Solutions
MCH/MGH Single and Dual DC-DC Converters
28 Volt input – 1.5 Watt
t
abLe
8: o
Perating
C
onDitions
, a
LL
M
oDeLs
: 25°C tC, 28 vDC vin, 100%
LoaD
,
unLess otherwise sPeCiFieD
.
ALL MODELS
PARAMETER
LEAD SOLDERING TEMPERATURE
1
SURFACE MOUNT SOLDER REFLOW
1, 2
STORAGE TEMPERATURE
1
CASE OPERATING
TEMPERATURE
DERATING OUTPUT POWER/CURRENT
1
ISOLATION, ANY PIN TO CASE
ExCEPT CASE PIN
INPUT TO OUTPUT CAPACITANCE
1
UNDERVOLTAGE LOCKOUT
1
CURRENT LIMIT
1, 3
AUDIO REJECTION
1
CONVERSION FREQUENCY
INHIBIT ACTIVE LOW (OUTPUT DISABLED)
Do not apply a voltage to the inhibit pin.
4
INHIBIT ACTIVE HIGH (OUTPUT ENABLED)
Do not apply a voltage to the inhibit pin.
4
FREE RUN
-55° TO +125°C
INHIBIT PIN PULLED LOW
INHIBIT PIN SOURCE CURRENT
1
REFERENCED TO
INHIBIT PIN CONDITION
OPEN PIN VOLTAGE
1
7
% OF FULL LOAD
FULL POWER
ABSOLUTE
1
LINEARLY
@ 500 VDC AT 25°C
CONDITIONS
10 SECONDS MAx.
SN 60, 62 OR 63 RECOMMENDED
-65
-55
-55
MIN
—
TYP
—
—
—
—
MAx
300
+150
+125
+135
UNITS
°C
°C
°C
220°C for max. of 30 seconds
From 100% at 125°C to 0% at 135°C
100
—
—
—
—
270
—
—
—
100 - 170
8
125
40
370
—
—
—
—
—
—
—
470
0.8
1
Megohms
pF
V
IN
%
dB
kHz
VDC
mA
INPUT COMMON
OPEN COLLECTOR OR
UNCONNECTED
—
12
V
Notes:
1. Guaranteed by qualification test and/or analysis. Not an in-line test.
2. See “Figure 23: MGH Gull-Wing Solder Pad Layout” on page 11 for more information
3. Dual outputs: The over-current limit will trigger when the sum of the currents from both outputs reaches 125% (typical value) of the maximum
rated “total” current of both outputs.
4. An external inhibit interface should be used to pull the inhibit low or leave it floating. The inhibit pin can be left unconnected if not used.
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