UNR Series
Single Output, Non-Isolated, 1.8/2.5/3.3VOUT 3.6-10W DC/DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions with no external filtering.
Specifications apply to both surface-mount and through-hole models, unless noted. ➀ ➆
Input
Input Voltage Range:
D5 Models
D12 Models
4.75-5.5 Volts (5V nominal)
10.8-13.6 Volts (12V nominal)
Overvoltage Shutdown
None
Start-Up Threshold:
D12 Models ➁
10.2V typical, 10.8V maximum
Undervoltage Shutdown:
D12 Models ➁
9.6V typical, 8.2V minimum
Input Current:
Normal Operating Conditions
Standby Mode (Off or undervoltage):
1.8VOUT
2.5VOUT, 3.3VOUT D5 Models
3.3VOUT D12 Models
Output Short-Circuit Condition
See Ordering Guide
20mA typical, 30mA maximum
11mA typical, 20mA maximum
5mA typical, 10mA maximum
50mArms
Input Ripple Current:
1.8VOUT, 3.3VOUT D12 Models
2.5VOUT, 3.3VOUT D5 Models
50mAp-p
150mAp-p
Input Filter Type
Capacitive
Reverse-Polarity Protection
None, install external fuse
On/Off Control ➂
TTL high (or open) = on, low = off
1.5V typical logic threshold
VOUT Accuracy (50% load):
1.8VOUT Models
2.5VOUT Models
3.3VOUT D5 Models
3.3VOUT D12 Models
Temperature Coefficient
Ripple/Noise (20MHz BW) ➃
Line/Load Regulation
Efficiency
Current Limiting ➄
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
Dynamic Characteristics
Transient Response (50% load step):
1.8VOUT Models
2.5VOUT, 3.3VOUT D12 Models
3.3VOUT D5 Models
20µsec to ±1% of final value
30µsec to ±1% of final value
40µsec to ±1% of final value
Start-Up Time: ➅ ➆
VIN to VOUT: D5 Models
D12 Models
On/Off to VOUT: D5 Models
D12 Models
100msec typical, 120msec maximum
13msec typical, 20msec maximum
60msec typical, 120msec maximum
13msec typical, 20msec maximum
Switching Frequency
200kHz (±30kHz)
Environmental
Operating Temperature (Ambient):
Without Derating
With Derating
–40 to +65/70°C
to +100°C (See Derating Curves)
Storage Temperature
–40 to +105°C
Flammability
UL 94V-0
Physical
Dimensions:
Surface Mount Package
Through Hole Package
.
1.01"x1.01"x0.49" (25.65x25.65x12.45mm) nom.
1.00"x1.00"x0.45" (25.40x25.40x11.43mm) nom.
Shielding:
Surface Mount Package
Through Hole Package
5-sided
None
Case Connection (Surface Mount)
Input/output return
Case Material:
Surface Mount Package
Through Hole Package
Corrosion-resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Diallyl phthalate, UL94V-0 rated
Pin or Lead Material:
Surface Mount
Through Hole
Tin plate over copper alloy
Gold plate over copper alloy
Weight
0.6 ounces (17 grams)
➀ D5 models require a minimum 300mA load current to maintain specified 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 specifications. 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
are specifiied with an external 22µF input capacitor. See I/O Filtering for details.
➁ See Startup Threshold and Undervoltage Shutdown for details.
➂ See On/Off Control for details.
➃ 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.
➄ 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.
➅ See Start-Up Time for details.
➆ 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.
Absolute Maximum Ratings
Input Voltage:
Continuous:
D5 Models
D12 Models
Transient (100msec):
D5 Models
D12 Models
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
Storage Temperature
Lead Temperature
Selective soldering (10 sec.)
Reflow soldering (75 sec.)
7 Volts
15 Volts
15 Volts
24 Volts
None, install external fuse
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 Specifications Table is not implied.
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