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UNR Series
Single Output, Non-Isolated, 1.8/2.5/3.3V OUT 3.6-10W DC/DC Converters
Performance/Functional Speci?cations
Typical @ T A = +25°C under nominal line voltage and full-load conditions with no external ?ltering.
Speci?cations apply to both surface-mount and through-hole models, unless noted. ? ?
Input
Physical
Input Voltage Range:
Dimensions:
.
D5 Models
D12 Models
Overvoltage Shutdown
Start-Up Threshold:
D12 Models ?
Undervoltage Shutdown:
D12 Models ?
Input Current:
Normal Operating Conditions
Standby Mode (Off or undervoltage):
1.8V OUT
2.5V OUT , 3.3V OUT D5 Models
3.3V OUT D12 Models
Output Short-Circuit Condition
Input Ripple Current:
1.8V OUT , 3.3V OUT D12 Models
2.5V OUT , 3.3V OUT D5 Models
4.75-5.5 Volts (5V nominal)
10.8-13.6 Volts (12V nominal)
None
10.2V typical, 10.8V maximum
9.6V typical, 8.2V minimum
See Ordering Guide
20mA typical, 30mA maximum
11mA typical, 20mA maximum
5mA typical, 10mA maximum
50mArms
50mAp-p
150mAp-p
Surface Mount Package
Through Hole Package
Shielding:
Surface Mount Package
Through Hole Package
Case Connection (Surface Mount)
Case Material:
Surface Mount Package
Through Hole Package
Pin or Lead Material:
Surface Mount
Through Hole
Weight
1.01"x1.01"x0.49" (25.65x25.65x12.45mm) nom.
1.00"x1.00"x0.45" (25.40x25.40x11.43mm) nom.
5-sided
None
Input/output return
Corrosion-resistant steel with
non-conductive, epoxy-based, black
enamel ?nish and plastic baseplate
Diallyl phthalate, UL94V-0 rated
Tin plate over copper alloy
Gold plate over copper alloy
0.6 ounces (17 grams)
Input Filter Type
Reverse-Polarity Protection
On/Off Control ?
Capacitive
None, install external fuse
TTL high (or open) = on, low = off
1.5V typical logic threshold
? D5 models require a minimum 300mA load current to maintain speci?ed regulation. D12
models have no minimum load requirement. Operating D5 models under no-load conditions
will not damage these devices, however they may not meet all listed speci?cations. The UNR-
1.8/2-D5 and D5SM require an external 15 ? pull-up resistor between +Input and On/Off
Control for normal operation. See On/Off Control for details. The UNR-3.3/3-D12 and D12SM
V OUT Accuracy (50% load):
1.8V OUT Models
2.5V OUT Models
3.3V OUT D5 Models
3.3V OUT D12 Models
Temperature Coef?cient
Ripple/Noise (20MHz BW) ?
Line/Load Regulation
Ef?ciency
Current Limiting ?
Output
±1.75% (±32mV) maximum
±1.75% (±44mV) maximum
±1.5% (±50mV) maximum
±1% (±33mV) maximum
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
Auto-recovery
are speci?ied with an external 22μF input capacitor. See I/O Filtering for details.
? See Startup Threshold and Undervoltage Shutdown for details.
? See On/Off Control for details.
? The 22μF external input capacitor required for the UNR-3.3/3-D12 and D12SM should be
minimally rated for 1.5Arms ripple current and 125m ? ESR. Output noise for all models can
be further reduced with the installation of external output capacitors. See I/O Filtering for
details.
? Current limiting initiates at approximately 30% above rated load. Under short-circuit
conditions, output current folds back to approximately 150mA and input current drops to
approximtely 50mA. Both remain at those levels until the short is removed.
? See Start-Up Time for details.
? 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.
Dynamic Characteristics
Transient Response (50% load step):
1.8V OUT Models
20μsec to ±1% of ?nal value
Absolute Maximum Ratings
2.5V OUT , 3.3V OUT D12 Models
3.3V OUT D5 Models
30μsec to ±1% of ?nal value
40μsec to ±1% of ?nal value
Input Voltage:
Continuous:
Start-Up Time: ? ?
V IN to V OUT : D5 Models
D12 Models
On/Off to V OUT : D5 Models
D12 Models
Switching Frequency
100msec typical, 120msec maximum
13msec typical, 20msec maximum
60msec typical, 120msec maximum
13msec typical, 20msec maximum
200kHz (±30kHz)
D5 Models
D12 Models
Transient (100msec):
D5 Models
D12 Models
Input Reverse-Polarity Protection
7 Volts
15 Volts
15 Volts
24 Volts
None, install external fuse
Environmental
Operating Temperature (Ambient):
Without Derating –40 to +65/70°C
With Derating to +100°C (See Derating Curves)
Storage Temperature –40 to +105°C
Flammability UL 94V-0
Output Overvoltage Protection
Output Current
Storage Temperature
Lead Temperature
Selective soldering (10 sec.)
Re?ow soldering (75 sec.)
None
Current limited. Devices can
withstand a sustained output
short circuit without damage.
–40 to +105°C
+300°C
+230°C
These are stress ratings. Exposure of devices to greater than any of these conditions may
adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Speci?cations Table is not implied.
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MDC_UNR 3.6-10W.C01 Page 4 of 8
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