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UNR Series
Single Output, Non-Isolated, 1.8/2.5/3.3V OUT 3.6-10W DC/DC Converters
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
Part Number ?
Vout (V)
Iout
(A)
Power
(W)
Output
R/N (mVp-p) ? Regulation (Max.)
Typ. Max. Line Load ?
V IN Nom.
(V)
Input
Range
(V)
I IN ?
(mA/A)
Ef?ciency
Min. Typ.
Package
(Case
Pinout)
UNR-1.8/2-D5
UNR-1.8/2-D5SM
UNR-2.5/2-D5
UNR-2.5/2-D5SM
UNR-3.3/3-D5
UNR-3.3/3-D5SM
UNR-3.3/3-D12 ?
UNR-3.3/3-D12SM ?
1.8
1.8
2.5
2.5
3.3
3.3
3.3
3.3
2
2
2
2
3
3
3
3
3.6
3.6
5
5
9.9
9.9
9.9
9.9
35
35
40
40
40
40
100
100
50
50
80
80
75
75
150
150
±0.35%
±0.35%
±0.1%
±0.1%
±0.4%
±0.4%
±0.25%
±0.25%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
5
5
5
5
5
5
12
12
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
10.8-13.6
10.8-13.6
30/0.91
30/0.91
200/5.62
200/5.62
40/2.25
40/2.25
40/0.93
40/0.93
77%
77%
85%
85%
86%
86%
87%
87%
79%
79%
89%
89%
88%
88%
89%
89%
C7A, P9
C17, P24
C7A, P9
C17, P24
C7A, P9
C17, P24
C7A, P9
C17, P24
? Typical at T A = +25°C under nominal line voltage and full-load conditions, unless otherwise noted.
The UNR-1.8/2-D5 and D5SM models require an external 15k ? pull-up resistor between +Input
and On/Off Control for normal operation. See On/Off Control for details.
? Ripple/Noise (R/N) measured over a 20MHz bandwidth. The UNR-3.3/3-D12 and D12SM models
are speci?ed with an external 22μF input capacitor. All other models are speci?ed with no external
I/O capacitors. Output noise on the D12 models can be reduced signi?cantly with the addition of
external output capacitors. See I/O Filtering.
? D5/D5SM models require a minimum 300mA load current to maintain regulation. D12/D12SM
models have no mimimum load requirement. Listed specs apply from 300mA to full load for D5/
D5SM models and from no load to full load for D12/D12SM models.
? Nominal line voltage, no-load/full-load conditions.
? D5/D5SM models may experience start-up problems if voltages greater than 1.0V (for 3.3V models)
or 1.2V (for 1.8/2.5V models) are present across the output pins during power-up.
? These are only partial part numbers. Refer to the part number structure when ordering.
PART NUMBER STRUCTURE
U NR - 2.5 / 2 - D5 SM - C
Output Con?guration:
U = Unipolar
RoHS-6 compliant
(Does not claim EU RoHS
exemption 7b, lead in solder)
Non-Isolated
Surface-Mount Packaging
Nominal Output Voltage:
1.8, 2.5 or 3.3 Volts
Maximum Output Current
in Amps
Input Voltage Range:
D5 = 4.75-5.5 Volts (5V nominal)
D12 = 10.8-13.6 Volts (12V nominal)
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MDC_UNR 3.6-10W.C01 Page 2 of 8
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