DATEL UNR-3.3-3-D5 Datasheet

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-3.3V

3 Amp, DC/DC Converters

DATEL’s new UNR-3.3/3-D5, 5V-to-3.3V, non-isolated DC/DC converter is a
true power-processing "component" that conveniently fits anywhere you need up
to 3 Amps of low-noise (30mVp-p), rapidly responding (40µsec step response),

3.3V current. The logical extension of today’s trend in distributed power is that
every low-voltage, high-current CPU, ASIC and PLD will ultimately require its
own little "power plant" right beside it. The low-cost UNR-3.3/3-D5, which
requires absolutely no external filtering around its miniature 1" x 1" package,
makes this power processing at the "point of use" an affordable reality today.

The impressively efficient (88%) UNR-3.3/3-D5 delivers its full 10W output
power over the –40 to +70°C ambient temperature range without heat sinking or
forced-air cooling. Devices are fully line and load regulated and feature remote
on/off control. Units can withstand a sustained output short circuit and automati­cally recover to rated accuracy when the short is removed.

The UNR-3.3/3-D5 achieves low cost, high reliability and high performance
by combining a proven circuit architecture (switching, step-down, buck regulator)
with the newest components (including extremely low ESR, "specialty polymer,"
electrolytic capacitors) in a 100% automatically assembled SMT design. For
improved thermal conductivity and ruggedness, the device is encapsulated with
a thermally conductive potting compound in a UL94V-0 plastic package.

If you’ve already considered and rejected the use of inefficient, step-down,
linear regulators, take a look at one of DATEL’s "switchers." Their high efficiency,
ease-of-use, and overall cost effectiveness will impress you. Safety agency
approvals and full EMI characterizations are currently in progress. Contact
DATEL for the latest status.

Low cost! Complete!

No external I/O capacitors required

Highly reliable, 100% SMT construction

1" x 1" x 0.45", plug-in package

+4.75V to +5.5V input

3.3V (±50mV), 3 Amp output

200kHz switching frequency; 88% efficient

–40 to +70°C operation with no derating

Low output noise, 30mVp-p

Quick transient response, 40µsec

Output short-circuit protection

On/off control; EMC compliant

IEC950/ EN60950/ UL1950 pending

Modifications and customs for OEM’s

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+V

IN

+V

OUT

INPUT

RETURN

LOGIC

GROUND

ON/OFF

C

ONTROL

OUTPUT
RETURN

CURRENT LIMITING
& S.C. SHUTDOWN

PWM

CONTROLLER

REFERENCE &

ERROR AMP

INNOVATION and EX C ELL E N C

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UNR Series

NON-ISOLATED, 10W, SINGLE OUTPUT DC/DC CONVERTERS

Input Voltage 7 Volts

Input Reverse-Polarity Protection None

Output Overvoltage Protection None

Output Current Current limited. Devices can

withstand a sustained output
short circuit without 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 Table 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-0414A 01/01

Return Current Paths

The Input Return (pin 5), Output Return (pin 4) and Logic Ground (pin 1) are
all connected to each other internal to the device. To the extent possible, all
load current should be returned through pin 4 (via low-impedance runs) and
all input current returned through pin 5. Any control signals applied to pin 2
should be referenced to pin 1. The internal trace leading to pin 1 is not
designed to carry high currents. Devices should never be installed in a
manner that results in high current flow through pin 1 (i.e., pins 4 and 5
should never be left open or attached via high-impedance connections).

MECHANICAL SPECIFICATIONS

I/O Connections

Pin Function P9

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

0.040 ±0.002 DIA.
(1.016 ±0.051)

1.00

(25.40)

0.45

(11.43)

0.20 MIN.
(5.08)

0.200
(5.08)

0.10

(2.54)

BOTTOM VIEW

3

1.00

(25.40)

0.800

(20.32)

0.100
(2.54)

1

2

4

6

0.800

(20.32)

0.200
(5.08)

0.400

(10.16)

5

0.10

(2.54)

STANDOFFS

0.020
(0.51)

PLASTIC CASE WITH AN INSULATED BASE

ORDERING INFORMATION

UNR-3.3/3-D5 Non-Isolated, 5V-to-3.3V, 10 Watt, DC/DC Converter

INNOVATION and EX C ELL E N C

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Case C7A

Performance/Functional Specifications

Typical @ TA = +25°C under nominal line voltage and full-load conditions,
with no external I/O filtering, unless noted.

À

À

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. Internal circuit design mandates that no voltages greater than 2.0V
are present on the output pins at power-up; failure to comply may result in start-up problems.

Á

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

Â

The On/Off Control pin 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 +5.0V. I

IH (@VIN = +5V) =

+2mA. I

IL (@VIN = 0V) = –5mA. Open-collector logic or a single NPN drive transistor can be

used. Applying a voltage to pin 2 when no input power is applied to the converter can cause
permanent damage to the converter.

Ã

In critical applications, output noise may be further reduced by installing external capacitors
across the output terminals. The caps should be located as close to the unit as possible and
must be selected for low ESR (typically less than 60m

Ω

).

Ä

Current limiting initiates at approximately 30% above rated load. Under short-circuit conditions,
output current folds back to approximately 150mA and remains there until the short is removed.

Input

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

Input Current

Á

40/2250mA

Input Filter Type Capacitive

Overvoltage Protection None

Reverse-Polarity Protection None

On/Off Control (Pin 2)

Â

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

Output

VOUT Accuracy (50% load) ±1.5% (±50mV) maximum

Temperature Coefficient ±0.02% per °C

Ripple/Noise (20MHz BW)

Ã

30mVp-p typical, 45mVp-p maximum

Line/Load Regulation ±0.4% maximum/ ±0.5% maximum

Efficiency 88% typical, 86% minimum

Current Limiting

Ä

Auto-recovery

Dynamic Characteristics

Transient Response (50% load step) 40µsec to ±1% of final value

Switching Frequency 200kHz (±30kHz)

Environmental

Operating Temperature (Ambient):

Without Derating –40 to +70°C
With Derating to +100°C (Straight line to 0 Watts)

Storage Temperature –40 to +105°C

Physical

Dimensions 1" x 1" x 0.45" (25 x 25 x 11.4mm)

Shielding None

Case Material Diallyl phthalate, UL94V-0 rated

Pin Material Brass, solder coated

Weight 0.6 ounces (17 grams)

ISO-9001 REGISTERED