NMT SERIES
Triple Output 3W DC-DC Converters
SELECTION GUIDE
Nominal
Input
Voltage
Output
Rated
Output
Voltage
Output Current
2
MIN
Full
Load
Load
Output Current
3
MIN
Full
Load
Load
MTTF
1
Order Code
(V)
VO1
V
鈥?4
鈥?8
鈥?2
鈥?4
鈥?8
鈥?2
(mA)
1.4
0.7
0.5
1.4
0.7
0.5
(mA)
42
21
14
42
21
14
(mA)
4.2
2.1
1.4
4.2
2.1
1.4
(mA)
126
63
42
126
63
42
kHrs
NMT0572S
5
VO2
VO3
VO1
145
NMT1272S
12
VO2
VO3
145
FEATURES
s
Triple Outputs (鈥?4V, 鈥?8V & 鈥?2V)
s
Toroidal Magnetics
s
Input/Output Isolation 1kVDC
s
Power Sharing on Outputs
s
Internal SMD Construction
s
Industrial Temperature Range
s
No External Components Required
s
Power Density 1.41W/cm
3
When operated
with
additional external load capacitance the rise time of the input voltage will determine the
maximum external capacitance value for guaranteed start up. The slower the rise time of the input voltage the
greater the maximum value of the additional external capacitance for reliable start up.
INPUT CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
s
UL 94V-0 Package Material
DESCRIPTION
The NMT series is a range of DC-DC
converters offering three output voltages of
鈥?4V, 鈥?8V and 鈥?2V from a single isolated
5V or 12V input voltage. The product is
designed for use with telecommunications
circuits requiring an on board supply for the
鈥?2V RING-TIP connection service generated
from a nominal 5V or 12V DC input supply
rail. The device also offers battery level
voltages of 鈥?4V and 鈥?8V for access
control and data pump IC's. The product is
packaged in an 8 pin SIP case for minimum
PCB footprint. The rated power may be
shared or drawn from any one output
providing the total output load does not
exceed 3W.
NMT0572S
NMT1272S
Ripple Current NMT0572S
(I
RIPPLE
)
NMT1272S
Zero Load Input NMT0572S, 0% output load
Current (I
CCZL
)
NMT1272S, 0% output load
Voltage Range
(V
IN
)
4.5
10.8
5.0
12
85
66
50
27.5
5.5
13.2
V
mA
80
50
mA
OUTPUT CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Total Rated Power (P
OUT
)
Single Channel Voltage
Setpoint Accuracy
Output Voltage - VO1 (V
OUT
)
Output Voltage - VO2 (V
OUT
)
Output Voltage - VO3 (V
OUT
)
Line Regulation
Load Regulation
Ripple & Noise
Total of all outputs or any
single output
P
OUT
= 100mW
P
OUT
= 3W
P
OUT
= 100mW
P
OUT
= 3W
P
OUT
= 100mW
P
OUT
= 3W
P
OUT
= 100mW
P
OUT
= 3W
VIN = 90% to 110%
of nominal
P
OUT
= 100mW to 3W
DC to 20MHz single
channel (24V)
0.1
0
鈥?.5
24.0
22.2
48.0
44.4
72.0
66.6
1.01
8
0
220
3.0
10
2.5
26.4
24.6
52.8
49.2
79.2
73.8
1.2
15
400
W
%
V
V
V
%
%
mV
ABSOLUTE MAXIMUM RATINGS
Short-circuit duration
4
Lead temperature 1.5mm from case for 10 seconds
Input voltage V
IN
, NMT0572S
Input voltage V
IN
, NMT1272S
1 second
300擄C
7V
15V
ISOLATION CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Isolation Voltage (V
ISOL
)
Isolation Capacitance (C
ISOL
)
Insulation Resistance
Flash tested for 1 second
NMT0572S, 1MHz, 1V
NMT1272S, 1MHz, 1V
1000VDC test
1000
65
130
10
VDC
pF
G鈩?/div>
1
GENERAL CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Efficiency
All channels or any single channel
Switching Frequency (f
OSC
)
75
85
85
%
kHz
www.dc-dc.com
1 Calculated using MIL-HDBK-217F with nominal input voltage at full load.
2 Assuming all 3 channels are equally loaded.
3 Assuming only 1 channel is loaded.
4 Supply voltage must be discontinued at the end of the short circuit duration.
All specifications typical at T
A
=25擄C, nominal input voltage and rated output current unless otherwise specified.
1
2
