Datasheet UNR-2.5-8-D5, UNR-2.5-10-D5 Datasheet (DATEL)

DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: [phone] Fax: [phone] · Email: [e-mail] · Internet: www.datel.com

Single Output

UNR Series

Features

Figure 1. Simplified Schematic

Non-Isolated, 5V -to-2.5V

8 and 10 Amp, DC/DC Converters

As supply voltages trend lower and load currents increase, centralized power
systems become more impractical. The tight accuracy, low noise and quick transient
response demanded by today’s low-voltage, high-current CPU’s, ASIC’s and DSP’s
make power processing at the "point of use" the only viable solution.

Designing your own circuit to efficiently derive local, low-voltage power from
higher-voltage buses (5V, 12V, 48V, etc.) becomes significantly more challenging as
voltages decrease much below 3.3V .

When you are designing power-hungry 2.5V partitions or boards, consider
DATEL’s new UNR-2.5/8-D5 and UNR-2.5/10-D5 as your local power source. These
non-isolated, 5V-to-2.5V DC/DC’s deliver up to 8A or 10A, respectively. Packaged in
1" x 2" x 0.39" metal cases, these converters use synchronous rectification, planar
magnetics and 100% automatic SMT assembly to bring you the most cost-effective

2.5V power available.

The 89% efficient 10A unit (UNR-2.5/10-D5) delivers its full 25 Watts from –40
to +50°C without heat sinking or forced-air cooling. The 90% efficient 8A unit (UNR-

3.3/8-D5) operates at full power to +60°C. Both are fully line (±0.1%) and load
(±0.5%) regulated and feature TTL-compatible on/off control. They can withstand
sustained output short circuits and automatically recover to rated accuracy.

Because true low-voltage, high-current DC/DC’s are not yet widely available,
you’re no doubt considering building your own buck regulator or compromising with
an inefficient, step-down, linear regulator. It’s time to consider the high efficiency ,
ease-of-use, and overall cost effectiveness of DA TEL ’ s 2.5V UNR’s. Safety agency
approvals and full EMI characterizations are currently in progress.

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Low cost!
+4.75V to +5.5V inputs
+2.5V (±25mV), 8 or 10 Amp outputs
200kHz, synchronous-rectifier topology
Low output noise, 40mVp-p
Quick transient response, 30µsec
High efficiencies: 90% for 8A, 89% for 10A
–40 to +60/50°C operation with no derating
Highly reliable, 100% SMT construction
Remote on/off control
Output short-circuit protection
1" x 2" metal packages; EMC compliant
IEC950/EN60950/UL1950 pending
Modifications and customs for OEM’s

+V

IN

+V

OUT

INPUT

RETURN

ON/OFF

C

ONTROL

OUTPUT
RETURN

CURRENT LIMITING
& S.C. SHUTDOWN

LOGIC

GROUND

PWM

CONTROLLER

REFERENCE &

ERROR AMP

Signals applied to the On/Off Control are referenced to Logic Ground
which is internally connected to Input/Output Return. The Logic Ground
pin is not designed to carry heavy current. Do not install units with the
Return pins open or connected via high-impedance runs.

INNOVATION and EX C ELL E N C E

®

®

UNR Series

NON-ISOLATED, 20W and 25W, SINGLE OUTPUT DC/DC CONVERTERS

Input Voltage 7 Volts
Output Current Current limited. Devices can

withstand a sustained output short
circuitwithout damage.

Storage Temperature –40 to +105°C
Lead Temperature (soldering, 10 sec.) +300°C

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 T able is not implied.

Absolute Maximum Ratings

DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.

DATEL (UK) LTD. Tadley, England Tel: [phone]
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: [phone]
DATEL GmbH München, Germany Tel: [phone]
DATEL KK Tokyo, Japan Tel: [phone], Osaka Tel: [phone]

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: [phone] [phone] Fax: [phone]
Internet: www.datel.com Email: [e-mail]
Data Sheet Fax Back:[phone]

DS-0431A 6/99

The On/Off Control pin has an internal 5k

W

pull-up resistor to +VIN. It can
be driven with any logic circuit capable of meeting the following drive require­ments. Logic "0" = 0 to +0.8V . Logic "1" = +2.0V to +VIN. IIH (@VIN = +2.0V) =
–0.7mA. I

IL (@VIN = 0V) = –1.1mA. Open collector logic or a single NPN drive

transistor can be used. The drive circuit should be rated for more than 5.5V .
Applying a voltage to pin 2 when no input power is applied to the converter can
cause permanent damage to the converter.

On/Off Control Functionality

INNOVATION and EX C ELL E N C

E

®

®

MECHANICAL SPECIFICATIONS

ORDERING INFORMATION

I/O Connections

Pin Function P9

1 Logic Ground
2 On/Off Control
3 +Output
4 Output Return
5 Input Return
6 +Input

Note:

The case is connected to
pin 5 (Input Return).

0.10

(2.54)

0.800

(20.32)

0.300
(7.62)

1.800

(45.72)

0.200
(5.08)

1.00

(25.40)

BOTTOM VIEW

1

2

3

4

6

0.10

(2.54)

5

0.400

(10.16)

METAL CASE

INSULATED BA S

E

2.00

(50.80)

0.39

(9.91)

0.20 MIN
(5.08)

UNR-2.5/8-D5 Non-Isolated, 5V-to-2.5V, 20 Watt, DC/DC Converter
UNR-2.5/10-D5 Non-Isolated, 5V-to-2.5V, 25 Watt, DC/DC Converter

PIN DIAMETERS:
MODEL UNR-2.5/8-D5, PINS 1-6: 0.040 ±0.002DIA. (1.016 ±0.051)
MODEL UNR-2.5/10-D5, PINS 1-2: 0.040 ±0.002DIA. (1.016 ±0.051)

PINS 3-6: 0.062 ±0.002DIA. (1.575 ±0.051)

Case C5A

Performance/Functional Specifications

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

➀

➀

Specifications apply to both models and require an external 470µF input capacitor rated for
6Arms ripple current and an external 22µF output capacitor with an ESR lower than
200mW. Both models have no minimum load requirements and will regulate under no-load
conditions.

➁

No-load/full-load conditions. When the unit is off, the input "standby" current is typically 10mA.

➂

See On/Off Control Functionality.

➃

Output noise may be reduced by installing additional external capacitors across the output
terminals. Caps should be selected for low ESR (typically 60m

W

) and located as close to the

unit as possible.

➄

Current limiting initiates at approximately 30% above rated load. Under short-circuit conditions,
output current folds back to approximately 1A and remains there until the short is removed.

Input

Input Voltage Range 4.75-5.5 Volts (5V nominal)
Input Current

➁

: UNR-2.5/8-D5 0.1/4.44A

UNR-2.5/10-D5 0.15/5.62A

Input Filter Type Capacitive
Overvoltage Protection None
Reverse-Polarity Protection None
On/Off Control (Pin 2)

➂

TTL high (or open) = on, low = off

Output

VOUT Accuracy (50% load) ±1% (±25mV) maximum
Temperature Coefficient ±0.02% per °C
Ripple/Noise (20MHz BW)

➃

40mVp-p typical, 80mVp-p maximum

Line/Load Regulation ±0.1% maximum/±0.5% maximum
Efficiency: UNR-2.5/8-D5 90% typical, 86% minimum

UNR-2.5/10-D5 89% typical, 85% minimum

Current Limiting

➄

Auto-recovery

Dynamic Characteristics

Transient Response (50% load step) 30µsec to ±1% of final value
Switching Frequency 200kHz (±20kHz)

Environmental

Operating Temperature (Ambient):

Without Derating (8A/10A models) –40 to +60/50°C
With Derating to +100°C ( Straight line to 0 Watts)

Storage Temperature –40 to +105°C

Physical

Dimensions 2" x 1" x 0.39" (51 x 25 x 9.9mm)
Shielding 5-sided
Case Connection Pin 5 (Input Return)
Case Material Corrosion resistant steel with

non-conductive, epoxy-based, black
enamel finish and plastic baseplate

Pin Material Brass, solder coated
Weight 1.4 ounces (39.7 grams)

ISO-9001 REGISTERED

DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: [phone] Fax: [phone] · Email: [e-mail] · Internet: www.datel.com

Single Output

UNR Series

Features

Figure 1. Simplified Schematic

Non-Isolated, 12V -to-2.5V

8 and 10 Amp, DC/DC Converters

As supply voltages trend lower, centralized power becomes more impractical.
The tight accuracy, low noise and quick transient response demanded by today’s
low-voltage, high-current CPU’s, ASIC’ s and DSP’s make power processing at the
"point of use" the only viable solution. Designing your own circuit to efficiently derive
local, low-voltage power from higher-voltage buses (5V , 12V, 48V, etc.) becomes
significantly more challenging as voltages decrease much below 3.3V.

If you’re designing a power-hungry 2.5V partition and you cannot get enough
power (via step-down regulators) from your already-overloaded +5V bus, consider
tapping into your +12V bus with one of DA TEL ’s non-isolated, 12V-to-2.5V DC/DC’s.
The UNR-2.5/8-D12 (8A output) and UNR-2.5/10-D12 (10A output) combine
synchronous rectification, planar magnetics and 100% automatic SMT assembly in
a 2" x 1" x 0.48" metal package to bring you the most cost-effective 2.5V power.

The 86% efficient 10A unit delivers 25 Watts from –40 to +40°C. The 88%
efficient 8A unit delivers full power to +50°C. Both are fully line and load regulated.
They feature input undervoltage shutdown (at 9.6V), output short-circuit protection
(foldback technique with auto-recovery), and TTL-compatible on/off control.

Because true low-voltage, high-current DC/DC’s are not yet widely available,
you’re no doubt considering building your own buck regulator or compromising with
an inefficient, step-down, linear regulator. It’s time to consider the high efficiency ,
ease-of-use, and overall cost effectiveness of DA TEL ’ s 2.5V UNR’s. Safety agency
approvals and full EMI characterizations are currently in progress.

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+10.4V to +13.6V inputs
+2.5V (±25mV), 8 or 10 Amp outputs
200kHz, synchronous-rectifier topology
Low output noise, 60mVp-p
Quick transient response, 30µsec
High efficiencies: 88% for 8A, 86% for 10A
–40 to +50/40°C operation with no derating
On/off control; Undervoltage shutdown
Output short-circuit protection
Highly reliable, 100% SMT construction
1" x 2" metal packages; EMC compliant
IEC950/EN60950/UL1950 pending
Modifications and customs for OEM’s

+V

IN

+V

OUT

INPUT

RETURN

ON/OFF

C

ONTROL

OUTPUT
RETURN

CURRENT LIMITING
& S.C. SHUTDOWN

UNDERVOLTAGE

SHUTDOWN

LOGIC

GROUND

REFERENCE &

ERROR AMP

PWM

CONTROLLER

INNOVATION and EX C ELL E N C E

®

®

UNR Series

NON-ISOLATED, 20 AND 25W, SINGLE OUTPUT DC/DC CONVERTERS

0.10

(2.54)

0.800

(20.32)

0.300
(7.62)

1.800

(45.72)

0.200
(5.08)

1.00

(25.40)

BOTTOM VIEW

1

2

3

4

6

0.10

(2.54)

5

0.400

(10.16)

METAL CASE

INSULATED BASE

2.00

(50.80)

0.48

(12.19)

0.20 MIN
(5.08)

MECHANICAL SPECIFICATIONS

Input Voltage 15 Volts
Output Current Current limited. Devices can

withstand a sustained output short
circuitwithout damage.

Storage Temperature –40 to +105°C
Lead Temperature (soldering, 10 sec.) +300°C

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 T able is not implied.

Absolute Maximum Ratings

The On/Off Control pin has an internal 12kW pull-up resistor to +VIN. It can
be driven with any logic circuit capable of meeting the following drive require­ments. Logic "0" = 0 to +0.8V. Logic "1" = +2.0V to +VIN. IIH (@VIN = +2.0V) =
–1mA. I

IL (@VIN = 0V) = –1.1mA. Open collector logic or a single NPN drive

transistor can be used. The drive circuit should be rated for more than 13.6V .
Applying a voltage to pin 2 when no input power is applied to the converter can
cause permanent damage to the converter.

On/Off Control Functionality

ORDERING INFORMATION

I/O Connections

Pin Function P9

1 Logic Ground
2 On/Off Control
3 +Output
4 Output Return
5 Input Return
6 +Input

Note:

The case is connected to
pin 5 (Input Return).

UNR-2.5/8-D12 Non-Isolated, 12V-to-2.5V, 20 Watt, DC/DC Converter
UNR-2.5/10-D12 Non-Isolated, 12V-to-2.5V, 25 Watt, DC/DC Converter

PIN DIAMETERS:
MODEL UNR-2.5/8-D12, PINS 1-6: 0.040 ±0.002DIA. (1.016 ±0.051)
MODEL UNR-2.5/10-D12, PINS 1-2: 0.040 ±0.002DIA. (1.016 ±0.051)

PINS 3-6: 0.062 ±0.002DIA. (1.575 ±0.051)

➀

Specifications apply to both models and require an external 470µF input capacitor rated for
6Arms ripple current and an external 22µF output capacitor with an ESR lower than 200m

W

.

Both models have no minimum load requirements and will regulate under no-load conditions.

➁

No-load/full-load conditions. When the unit is off, the input "standby" current is typically 10mA.

➂

On start-up, devices will not regulate properly until the input reaches approximately +10.2V . If
the input drops below +9.6V, units will turn off. Restart requires bringing the input back to +10.2V .

➃

See On/Off Control Functionality.

➄

Output noise may be reduced with additional external capacitors across the output terminals.
Caps should have low ESR (typically 60m

W

) and be located as close to the unit as possible.

➅

Current limiting initiates at approximately 30% above rated load. Under short-circuit conditions,
output current folds back to approximately 1A and remains there until the short is removed.

Performance/Functional Specifications

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

➀

Input

Input Voltage Range 10.4-13.6 Volts (12V nominal)
Input Current

➁

: UNR-2.5/8-D12 0.1/1.89A

UNR-2.5/10-D12 0.1/2.41A

Input Filter Type Capacitive
Overvoltage Protection None
Reverse-Polarity Protection None
Start-Up Threshold

➂

10.2V typical, 10.4V maximum

Undervoltage Shutdown

➂

9.6V typical, 8.2V minimum

On/Off Control (Pin 2)

➃

TTL high (or open) = on, low = off

Output

VOUT Accuracy (50% load) ±1% (±25mV) maximum
Temperature Coefficient ±0.02% per °C
Ripple/Noise (20MHz BW)

➄

40mVp-p typical, 80mVp-p maximum

Line/Load Regulation ±0.1% maximum/±0.625% maximum
Efficiency:UNR-2.5/8-D12 88% typical, 85% minimum

UNR-2.5/10-D12 86% typical, 83% minimum

Current Limiting

➅

Auto-recovery

Dynamic Characteristics

Transient Response (50% load step) 30µsec to ±1% of final value
Switching Frequency 200kHz (±20kHz)

Environmental

Operating Temperature (Ambient):

Without Derating (8A/10A models) –40 to +50/40°C
With Derating to +100°C (Straight line to 0 Watts)

Storage Temperature –40 to +105°C

Physical

Dimensions 2" x 1" x 0.48" (51 x 25 x 12.2mm)
Shielding 5-sided
Case Connection Pin 5 (Input Return)
Case Material Corrosion resistant steel with

non-conductive, epoxy-based, black
enamel finish and plastic baseplate

Pin Material Brass, solder coated
Weight 1.4 ounces (39.7 grams)

DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.

DATEL (UK) LTD. Tadley, England Tel: [phone]
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: [phone]
DATEL GmbH München, Germany Tel: [phone]
DATEL KK Tokyo, Japan Tel: [phone], Osaka Tel: [phone]

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: [phone] [phone] Fax: [phone]
Internet: www.datel.com Email: [e-mail]
Data Sheet Fax Back: [phone]

DS-0433A 6/99

INNOVATION and EX C ELL E N C

E

®

®

Case C5C

ISO-9001 REGISTERED

INNOVATIO N and EX C ELL E N C E

® ®

DATEL, Inc., Mansfield, MA, USA • Tel: [phone] • Fax: [phone] • Email: [e-mail]

Data sheet fax back: [phone] • Visit us on the internet: www.datel.com

3

12 (6-16.5) 2 x 0.4 x 0.8 ➃ B1, P18 ±1.0% ±3.0% 50 92% ➅ UNS-5/3-D12 UNS, 10/15W
12 (6-16.5) 2 x 0.8 x 0.4 ➄ B2, P18 ±1.0% ±3.0% 50 92% ➅ UNS-5/3-D12D UNS, 10/15W

5 ➆ 12 (10.4-13.6) 2 x 1 x 0.48 C13, P21 ±0.25% ±0.5% 60 87% UNR-5/5-D12 UNR, 25W

Listed specifications are typical at TA = +25°C under nominal line voltage and full-load conditions, unless noted.

➀ See individual product data sheets for mechanical specifications and pinouts.
➁ Ripple/Noise is specified over a 20MHz bandwidth.
➂ Listed specifications for these products are preliminary.
➃ 10-pin SIP package.
➄ 10-pin DIP package.
➅ Listed specification is a typical.
➆ Output voltage is user adjustable from 3.3 to 6V.
➇ Output voltage is user adjustable from 1.4 to 3.6V.
➈ Industry-standard, 11-pin SIP package.

NON-ISOLATED DC/DC CONVERTER SELECTION GUIDE

NON-ISOLATED DC/DC CONVERTER SELECTION GUIDE

Output Input Voltage, Ripple/

Current Nominal (Range) Dimensions Case, Line Load Noise ➁ Efficiency DATEL Data Sheet @

(Amps, Max.) (Volts) (Inches) Pinout (Max.) (Max.) (mVp-p) (Min.) Model Number www.datel.com

Package ➀ Regulation

2.5V

SINGLE OUTPUT, NON-ISOLATED

2.5V

SINGLE OUTPUT, NON-ISOLATED

Rev. C 6/99

5V

SINGLE OUTPUT, NON-ISOLATED

5V

SINGLE OUTPUT, NON-ISOLATED

2 5 (4.75-5.5) 1 x 1 x 0.45 C7A, P9 ±0.25% ±0.5% 30 83% UNR-2.5/2-D5 UNR, 5W

8

5 (4.75-5.5) 2 x 1 x 0.39 C5A, P9 ±0.1% ±0.5% 40 86% UNR-2.5/8-D5 UNR, 20/25W

12 (10.4-13.6) 2 x 1 x 0.48 C5C, P9 ±0.1% ±0.6% 40 85% UNR-2.5/8-D12 UNR, 20/25W

10

5 (4.75-5.5) 2 x 1 x 0.39 C5A, P9 ±0.1% ±0.5% 40 85% UNR-2.5/10-D5 UNR, 20/25W

12 (10.4-13.6) 2 x 1 x 0.48 C5C, P9 ±0.1% ±0.6% 40 83% UNR-2.5/10-D12 UNR, 20/25W

12 5 (4.75-5.5) 2 x 1 x 0.44 C5B, P9 ±0.1% ±0.5% 40 84% UNR-2.5/12-D5 UNR, 30W
20 5 (4.5-5.5) 2 x 2 x 0.49 C21, P26 ±0.1% ±1.0% 60 85% UNR-2.5/20-D5 ➂ Contact DATEL

5 (4.75-5.5) 1 x 1 x 0.45 C7A, P9 ±0.4% ±0.5% 30 86% UNR-3.3/3-D5 UNR, 10W

3

7.5 (4.75-13.6) 2 x 0.4 x 0.8 ➃ B1, P18 ±1.0% ±3.0% 50 90% ➅ UNS-3.3/3-D5 UNS, 10/15W

7.5 (4.75-13.6) 2 x 0.8 x 0.4 ➄ B2, P18 ±1.0% ±3.0% 50 90% ➅ UNS-3.3/3-D5D UNS, 10/15W
12 (10.4-13.6) 1 x 1 x 0.45 C7A, P9 ±0.25% ±0.5% 100 87% UNR-3.3/3-D12 UNR, 10W

5 (4.75-5.5) 2 x 1 x 0.39 C5A, P9 ±0.1% ±0.5% 40 88% UNR-3.3/8-D5 UNR, 26/33W
5 (4.75-5.5) 2 x 1 x 0.39 C16A, P23 ±0.1% ±0.5% 40 88% UNR-3.3/8-D5T ➂ ➇ Contact DATEL

8 5 (4.75-5.5) 2 x 0.4 x 0.53 ➈ B3, P27 ±0.1% ±0.5% 40 88% USN-3.3/8-D5 ➂ Contact DATEL

12 (10.4-13.6) 2 x 1 x 0.48 C5C, P9 ±0.1% ±0.6% 60 86% UNR-3.3/8-D12 UNR, 26/33W
12 (10.4-13.6) 2 x 1 x 0.48 C16C, P23 ±0.1% ±0.6% 60 86% UNR-3.3/8-D12T ➂ ➇ Contact DATEL

5 (4.75-5.5) 2 x 1 x 0.39 C5A, P9 ±0.1% ±0.5% 40 86% UNR-3.3/10-D5 UNR, 26/33W
5 (4.75-5.5) 2 x 1 x 0.39 C16A, P23 ±0.1% ±0.5% 40 86% UNR-3.3/10-D5T ➂ ➇ Contact DATEL

10 5 (4.75-5.5) 2 x 0.4 x 0.53 ➈ B3, P27 ±0.1% ±0.5% 40 86% USN-3.3/10-D5 ➂ Contact DATEL

12 (10.4-13.6) 2 x 1 x 0.48 C5C, P9 ±0.1% ±0.6% 60 85% UNR-3.3/10-D12 UNR, 26/33W
12 (10.4-13.6) 2 x 1 x 0.48 C16C, P23 ±0.1% ±0.6% 60 85% UNR-3.3/10-D12T ➂ ➇ Contact DATEL

12 5 (4.75-5.5) 2 x 1 x 0.44 C5B, P9 ±0.1% ±0.5% 40 87% UNR-3.3/12-D5 UNR, 40W
20 5 (4.5-5.5) 2 x 2 x 0.49 C21, P26 ±0.1% ±1.0% 50 87% UNR-3.3/20-D5 ➂ Contact DATEL

3.3V

SINGLE OUTPUT, NON-ISOLATED

3.3V

SINGLE OUTPUT, NON-ISOLATED