Isolated 1W SM 2:1 Input Single Output DC-DC Converters
Rated Input
Current
Efficiency
Min.
%
72
77
77
73
74
75
Ripple and Noise
Typ. Max.
mVp/p mVp/p
25
25
20
30
25
25
50
50
40
55
50
50
MTTF
2
MIL
kHrs
1143
1129
977
1042
990
833
Order Code
1
V
3.3
5
12
3.3
5
12
mA
303
200
83
303
200
83
mA
110
110
100
55
55
55
Typ.
%
75
78.5
79
75.5
76.5
77
Telecordia
kHrs
17407
17407
17407
17109
17109
17109
FEATURES
UL 60950 recognised for reinforced
insulation
ANSI/AAMI ES60601-1, 1 MOPP/ 2 MOOPs
recognised
3kVAC isolation test voltage ‘Hi Pot Test’
Continuous short circuit protection
Output Voltage Trim
Remote on/off pin
No electrolytic capacitors
Operating temperature range -40°C to
100°C
2:1 Input Range
INPUT CHARACTERISTICS
Parameter
Voltage range
24V input types
Input reflected ripple
current
All variants
18
24
2
36
mA p-p
Conditions
12V input types
Min.
9
Typ.
12
Max.
18
Units
V
OUTPUT CHARACTERISTICS
Parameter
Rated power
Conditions
All output types
Min.
10
-2.5
-3
Typ.
Max.
1
2
2
Units
W
%
%
%
%
%V
out
Minimal load to meet datasheet specification
Voltage set point accuracy
Line regulation
Load regulation
3V, 5V output types
12V output types
Low line to high line
All output types
2403 variant
Peak deviation (25-75%
& 75-25% swing)
Transient response
Settling time
(within 5% V
out
Nom.)
2405 variant
All other variants
1203
1205
1212, 2403 & 2405
2412
±0.05
±0.25
±0.2
±0.5
±4
±3
±2
PRODUCT OVERVIEW
The MTC1 series of miniature surface mount DC-
DC converters offers a single output voltage from
input voltage ranges of 9-18V and 18-36V. The
MTC1 series regulated output voltage is adjust-
able by ±10% and a remote on/off pin is also
included for application power saving.
The MTC1 ideally suited to applications which
include medical. Industrial, telecommunications,
battery powered systems, and process automa-
tion.
220
260
100
70
μs
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Isolation capacitance
Resistance
Conditions
Production tested for 1 second
Qualification tested for 1 minute
All variants
Viso = 1kVDC
Min.
3000
3000
Typ.
Max.
Units
VAC
VAC
pF
GΩ
7
1
1. Components are supplied in tape and reel packaging, please refer to package specification section. Orderable part numbers are
MTC1SXXXXMC-R7 (30 pieces per reel), or MTC1SXXXXMC-R13 (150 pieces per reel)
2. Calculated using MIL-HDBK-217 FN2 and Telecordia SR-332 calculation model with nominal input voltage at full load.
All specifications typical at T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
For full details go to
www.murata-ps.com/rohs
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KDC_MTC1.D04
Page 1 of 11
MTC1 Series
Isolated 1W SM 2:1 Input Single Output DC-DC Converters
GENERAL CHARACTERISTICS
1
Parameter
Switching frequency
Conditions
1203, 2405, 2403 variants
1205, 2412 variants
1212 variant
Module on, pin unconnected or open collector floating
Module off (refer to application notes)
12V input types
24V input types
Min.
Typ.
240
260
300
2
1.5
3.9
Max.
Units
kHz
Remote on/off pin
V
mW
TEMPERATURE CHARACTERISTICS
Parameter
Operation
Storage
Case temperature above ambient
Conditions
Min.
-40
-50
Typ.
Max.
100
125
Units
°C
100% Load, Nom V
IN
, Still Air
15
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection (for SELV input voltages)
Remote on/off pin input voltage
Input voltage, MTC1 12V input types
Input voltage, MTC1 24V input types
Continuous
6V
25V
40V
APPLICATION NOTES
Maximum Output Capacitance
Maximum output capacitance should not exceed:
Output Voltage
V
3.3
5
12
Maximum Load Capacitance
μF
470
470
220
Start-up times
Typical start up times for this series, with a typical input voltage rise time of 2.2μs and output capacitance of 10μF, are shown in the table below. The product series will
start into the maximum output capacitance with increased start times.
Typical Wave Form:
Part No.
MTC1S1203MC
MTC1S1205MC
MTC1S1212MC
MTC1S2403MC
MTC1S2405MC
MTC1S2412MC
Start-up times
ms
5
14
25
9
14
25
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KDC_MTC1.D04
Page 2 of 11
MTC1 Series
Isolated 1W SM 2:1 Input Single Output DC-DC Converters
APPLICATION NOTES
Control Pin
The MTC1 converters have a shutdown feature which enables the user to put the converter into a low power state. The control pin connects directly to the base of an
internal transistor, and the switch off mechanism for the MTC1 works by forward biasing this NPN transistor. If the pin is left open (high impedance), the converter will be ON
(there is no allowed low state for this pin), but once a control voltage is applied with sufficient drive current, the converter will be switched OFF. A suitable application circuit
is shown below.
V
IN
MTC1S
R
2
D
1
(e.g. 1N4001) is required to provide high impedance when the signal is low.
From the MTC1 specification, the drive current to operate this function is recom-
mended to be 3mA to 8mA, and hence the value of R
1
can be derived as follows:
R
1
=
V
C
- V
D
- 0.6
I
B
V
C
OV
-V
IN
R
1
D
1
CTRL
Assuming V
C
=5V, V
D
=0.7V:
Q
1
R
1
=
5 - 0.7 - 0.6
= 732Ω (E96, 1% resistor)
5 x 10
-3
For 5V TTL signal:
Set R1 to be 82Ω or less
Output Voltage Adjustment
The MTC1S series has a trim capability which is located at pin 3, this allows the user to independently adjust the output voltages by ±10%. Adjustments to the output
voltages can be accomplished via a single fixed resistor as shown in Figures 1 and 2. A single fixed resistor can increase or decrease the output voltage depending on its
connection. Fixed resistors should have low temperature coefficient to minimize sensitivity to changes in temperature.
A single resistor connected from the TRIM pin (pin 3) to the +Vout (pin 4), will decrease the output voltage which is shown in figure 1.
A single resistor connected from the TRIM pin (pin 3) to the -Vout (pin 2) will increase the output voltage which is shown in figure 2.
TRIM DOWN
Figure 1. Trim connections to decrease the output voltage
TRIM UP
Figure 2. Trim connections to increase the output voltage
1
+Vin
-Vout
2
1
+Vin
-Vout
2
R
TRIM
TRIM
6
3
TRIM
R
TRIM
6
3
-Vin
CTRL
-Vin
CTRL
5
+Vout
4
5
+Vout
4
3.3V
out
R
TRIM
=
18.64k x V
out
- 52.3k
3.32 - V
out
33.2k x V
out
- 141k
5 - V
out
21.5k x V
out
- 171.29k
11.979 - V
out
3.3V
out
R
TRIM
=
14k x V
out
- 52.3k
3.32 - V
out
23.2k x V
out
- 141k
5 - V
out
12.4k x V
out
- 171.29k
11.979 - V
out
5V
out
R
TRIM
=
5V
out
R
TRIM
=
12V
out
R
TRIM
=
12V
out
R
TRIM
=
Accuracy of adjustment is subject to tolerances of resistors and factory adjusted output accuracy. Vout is equal to the desired output voltage.
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KDC_MTC1.D04
Page 3 of 11
MTC1 Series
Isolated 1W SM 2:1 Input Single Output DC-DC Converters
TECHNICAL NOTES
ISOLATION VOLTAGE
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test
voltage, applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions MTC1 series of DC-DC converters are all 100%
production tested at 3kVAC for 1 second and have been qualification tested at 3kVAC for 1 minute.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The MTC1 series has been recognised by Underwriters Laboratory to 250 Vrms Reinforced Insulation, please see safety approval section below.
REPEATED HIGH-VOLTAGE ISOLATION TESTING
It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on
materials, construction and environment. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be
reduced by 20% from specified test voltage.
SAFETY APPROVAL
ANSI/AAMI ES60601-1
The MTC1 series has been recognised by Underwriters Laboratory (UL) to ANSI/AAMI ES60601-1 and provides 1 MOPP (Means Of Patient Protection) and 2 MOOP (Means Of
Operator Protection) based upon a working voltage of 250 Vrms max., between Primary and Secondary. File number E202895 applies.
UL 60950
The MTC1 series has been recognised by Underwriters Laboratory (UL) to UL 60950 for reinforced insulation to a working voltage of 250 Vrms. File number E151252 applies.
Creepage and clearance is 5mm.
FUSING
The MTC1 Series of converters are not internally fused so to meet the requirements of UL an anti-surge input line fuse should always be used with ratings as defined below.
Input Voltage, 12V: 0.5A
Input Voltage, 24V: 0.25A
All fuses should be UL recognised and rated to 125V.
RoHS COMPLIANCE INFORMATION, MSL
This series is compatible with RoHS soldering systems with a peak reflow solder temperature of 245ºC as per J-STD-020D.1. The pin termination
finish on this product series is Gold with Nickel Pre-plate. The series is backward compatible with Sn/Pb soldering systems. The series has a
Moisture Sensitivity Level (MSL) 1.
CHARACTERISATION TEST METHODS
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
C1
1μF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC-DC converter
10μF tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the DC-DC converter with an ESR of less
C2
than 100mΩ at 100 kHz
C3
100nF multilayer ceramic capacitor, general purpose
R1
450Ω resistor, carbon film, ±1% tolerance
R2
50Ω BNC termination
T1
3T of the coax cable through a ferrite toroid
RLOAD
Resistive load to the maximum power rating of the DC-DC converter. Connections should be made via twisted wires
Measured values are multiplied by 10 to obtain the specified values.
Differential Mode Noise Test Schematic
DC/DC Converter
OSCILLOSCOPE
C1 C2 C3
+
SUPPLY
Input
R1
T1
R2
Y INPUT
+
Output
-
-
R LOAD
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KDC_MTC1.D04
Page 4 of 11
MTC1 Series
Isolated 1W SM 2:1 Input Single Output DC-DC Converters
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