DATEL UNR-3.3-2500-D12, UNR-3.3-12000-D5, UNR-3.3-8000-D5, UNR-3.3-3000-D5 Datasheet

Figure 1. Simplified Schematic

Features

New low-voltage microprocessor and memory chips are driving the migration
from centralized to distributed power processing in modern telecommunication and
computer systems. Powering these new chips requires local, on-board power
converters that rapidly source large amounts of current while maintaining accurate
voltages with minimal ripple and noise. The distribution losses, unpredictable
regulation and poor transient response of traditional centralized power systems are
no longer acceptable. Power processing at the "point-of-use" is frequently the only
way to achieve desired performance.

DATEL’s new UNR Series of non-isolated, 3.3V output, 5V or 12V input, switching
DC/DC converters were specifically designed for on-board usage in today’s mixed­logic 5V/3.3V systems. They also support those systems that are already drawing
maximum current from their 5V buses and must resort to their 12V buses.

These low-cost, extremely efficient (typically 90%) power converters are capable
of delivering full rated output currents (2.5-12 Amps) while maintaining low case
temperatures without the need for heat sinks or any auxiliary cooling. UNR Series
devices combine proven circuit architectures, contemporary SMT-on-ceramic and
SMT-on-pcb assembly techniques, and a new thermally-conductive potting com­pound to achieve high output power in the smallest packages possible.

DATEL is currently developing UNR Series devices that incorporate active load
sharing with output current/voltage-sensing capabilities. We can also quickly modify
existing devices for application-specific output voltages from 1.8 to 5 Volts. Please
contact us with your unique requirements ... we may already have the product you
need.

DATEL also makes a complete line of isolated 3.3V DC/DC converters that
operate from wide-range input voltages from 4.6 to 72V.

Single Output

UNR Series

Non-Isolated, 3.3V

8-40 Watt, DC/DC Converters

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Low cost

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5V or 12V inputs

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3.3V±1% (±33mV) outputs

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±0.25% (±8mV) max. line regulation

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±0.5% (±17mV) max. load regulation

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Guaranteed efficiencies to 86%

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Power densities to 29W/in

3

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High output current ... small packages:

3A (1" x 1" package)
8A (2" x 1" package)
12A (2" x 2" package)

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No heat sinks required

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–40 to +100oC operating temperatures

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On/off/sync control

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UL, CSA, IEC safety approvals

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Customized VOUT (Contact DATEL)

+V

IN

+V

OUT

PWM

CONTROLLER

REFERENCE &

ERROR AMP

INPUT

RETURN

LOGIC

GROUND

ON/OFF

CONTROL

OUTPUT
RETURN

DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048 (U.S.A.) • Tel: [phone] Fax: [phone] • Email: [e-mail]

INNOVATION and EX C ELL E N C E

®

®

METAL CASE

INSULATED BASE

0.060 –0.002 DIA

PINS 3-6
(1.524 –0.051)

0.040 –0.002 DIA

PINS 1-2
(1.016 –0.051)

2.00

(50.80)

0.45

(11.3)

0.20 MIN
(5.08)

0.10

(2.54)

0.400

(10.160)

1

2

3

1.800

(45.720)

0.300

(7.620)

BOTTOM VIEW

4

6

0.60

(15.24)

2.00

(50.80)

0.200

(5.080)

5

0.800

(20.320)

METAL CASE

INSULATED BASE

0.040 –0.002 DIA
(1.016 –0.051)

2.00

(50.80)

0.45

(11.43)

0.20 MIN
(5.08)

0.10

(2.54)

0.800

(20.320)

0.300

(7.620)

1.800

(45.720)

0.200

(5.080)

1.00

(25.40)

BOTTOM VIEW

1

2

3

4

6

0.10

(2.54)

5

0.400

(10.160)

METAL CASE

INSULATED BASE

0.040 –0.002 DIA
(1.016 –0.051)

1.00

(25.40)

0.45

(11.43)

0.20 MIN.
(5.08)

0.200

(5.080)

0.10

(2.54)

BOTTOM VIEW

3

1.00

(25.40)

0.800

(20.320)

0.100

(2.540)

1
2

4

6

0.800

(20.320)

0.200

(5.080)

0.400

(10.160)

5

0.10

(2.54)

UNR-3.3/3000-D5 3.3 3000 140 ±0.25% ±0.5% 5 4.75-5.5 25/2390 85% C7, P9
UNR-3.3/2500-D12 3.3 2500 100 ±0.2% ±0.5% 12 10.8-13.2 35/856 82% C7, P10
UNR-3.3/8000-D5 3.3 8000 75 ±0.25% ±0.5% 5 4.75-5.5 25/6330 86% C5, P9
UNR-3.3/12000-D5 3.3 12000 125 ±0.25% ±0.75% 5 4.75-5.5 50/9700 84% C6, P9

UNR Series NON-ISOLATED, 3.3V, 8-40W DC/DC CONVERTERS

Performance Specifications and Or dering Guide

VOUT

(Volts)

Output

Package

(Case,

Pinout)

Efficiency

(Min.)

Regulation (Max.)

Line

VIN Nom.

(Volts)

Range
(Volts)

Model

Input

Input Volta ge Range:

D5 = 4.75-5.5 Volts (5V nominal)
D12 = 10.8-13.2 Volts (12V nominal)

Output Configuration:

U = Unipolar

2

Non-Isolated

Nominal Output Voltage:

3.3 Volts

Maximum Output Current

in mA

Mechanical Specifications

Part Number Structure

Mechanical Specifications

IOUT

(mA, Max.)

IIN ➃

(mA, Max.)

Function P9

Logic Gnd.

On/Off Control

+Output

Output Rtn.

Input Rtn.

+Input

I/O Connections

Function P10

Do Not Connect

No Connect

+Output

Output Rtn.

Input Rtn.

+Input

Pin

1
2
3
4
5
6

➀

Ripple/Noise

➁

(mVp-p, Max.)

Case C7

➀

T ypical at TA = +25°C under nominal line voltage and full load conditions unless otherwise noted. These de vices require e xternal input and output capacitors for normal operation.

➁

20MHz bandwidth. Specified with external I/O capacitors. See T echnical Notes .

➂

10% to 100% load.

➃

Nominal line voltage, no load/full load conditions.

Case C5

Case C6

Load

➂

U NR - 3.3 / 8000 - D5

Performance/Functional Specifications

UNR Series

NON-ISOLATED, 3.3V, 8-40W DC/DC CONVERTERS

3

Typical @ TA = +25°C under nominal line voltage and full load conditions unless noted. ➀ ➁

Input

Input Voltage Range:

"D5" Models 4.75-5.5 Volts (5V nominal)
"D12" Models 10.8-13.2 Volts (12V nominal)

Input Current See Ordering Guide
Input Filter Type ➁ None
Overvoltage Shutdown None
Reverse-Polarity Protection Yes (Instantaneous, 10A maximum)
On/Off (Sync.) Control (Pin 2) ➂ TTL high = off, low (or open) = on

Output

V

OUT Accuracy (50% load) ±1%

Temperature Coefficient ±0.02% per °C
Ripple/Noise (20MHz BW) ➁ See Ordering Guide
Line/Load Regulation See Ordering Guide
Efficiency See Ordering Guide
Current Limiting Auto-recovery

Dynamic Characteristics

Transient Response (25% load step) 100µsec to ±1.5% of final value
Switching Frequency:

"D5" Models 75kHz (±5kHz)

"D12" Models 90kHz (±5kHz)

Environmental

Operating Temperature (ambient):

Without Derating:

3A an 8A "D5" Models –40 to +50°C
12A "D5" and 2.5A "D12" Models –40 to +45°C

With Derating to +100°C (See Derating Curves)

Storage Temperature –55 to +105°C

Physical

Dimensions:

3A "D5" and 2.5A "D12" Models 1" x 1" x 0.45" (25 x 25 x 11.4mm)
8A "D5" Model 2" x 1" x 0.45" (51 x 25 x 11.4mm)
12A "D5" Model 2" x 2" x 0.45" (51 x 51 x 11.4mm)

Shielding 5-sided ➃
Case Connection Pin 4 (Output Return)
Case Material Corrosion resistant steel with

epoxy-based enamel finish

Pin Material Brass, solder coated
Weight:

3A "D5" and 2.5A "D12" Models 1 ounce (28.4 grams)
8A "D5" Model 1.5 ounces (42.5 grams)
12A "D5" Model 2 ounces (56.7 grams)

➀ These power converters require a minimum 10% loading to maintain specified regulation.

Operation under no-load conditions will not damage these devices, however, they may
not meet all listed specifications.

➁ These power converters do not have internal input filters and do require external input

and output capacitors to achieve rated specifications. Application-specific internal input/
output filtering can be added upon request. Contact DATEL for details.

➂ On/Off Control pins are included on "D5" models only. See Technical Notes for details.

Applying a voltage to the Control pin when no input power is applied to the converter can
cause permanent damage to the converter.

➃ Cases can be provided with 6-sided shielding. Contact DATEL for details.

Absolute Maximum Ratings

These are stress ratings. Exposure of devices to 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. Storage temperatures have been verified for 168 hours.

Input Voltage:

"D5" Models 7 Volts
"D12" Models 15 Volts

Input Reverse-Polarity Protection Current must be <10A. Brief

duration. Fusing recommended.

Output Overvoltage Protection None
Output Current Current limited. Max. current and

short-circuit duration model
dependent.

Storage Temperature –55 to +105°C
Lead Temperature (soldering, 10sec.) +300°C

Temperature Derating

Output Current (Amps)

Ambient Temperature (°C)

–40 0 40 45 50 55 60 65 70 75 80 85 90 95 100

20
19
18
17
16
15
14
13
12
11
10

9
8
7
6
5
4
3
2
1
0

A

B

UNR-3.3/12000-D5 A
UNR-3.3/8000-D5 B
UNR-3.3/3000-D5 C
UNR-3.3/2500-D12 D

C

D