DATEL UNR-3.3-10-D12, UNR-3.3-8-D12 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

8 and 10 Amp, DC/DC Converters

As 3.3V CPU’s, DSP’s and PLD’s proliferate and low-voltage currents increase,
the shortcomings of both traditional centralized power architectures and the
recently introduced 3.3V outputs on AC/DC converters become apparent. The
solution is to locally derive 3.3V power from buses of higher voltage (5V, 12V, 48V ,
etc.). "Point-of-use" power processing is the only way to guarantee the tight
accuracy, low noise, and quick transient response required by these new devices.

If you are designing power-hungry 3.3V partitions or boards, consider DATEL’s
new UNR-3.3/8-D5 and UNR-3.3/10-D5. These non-isolated, 5V-to-3.3V 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 3.3V power.

The 91% efficient 10A unit (UNR-3.3/10-D5) delivers its full 33W output power
from –40 to +50°C without heat sinking or forced-air cooling. The 92% efficient
8A unit (UNR-3.3/8-D5) operates at full power to +60°C. Both are fully line (±0.1%
max.) and load (±0.5% max.) regulated and feature a TTL-compatible on/off control.
They can withstand sustained output short circuits and automatically recover to
rated accuracy .

Designing your own 3.3V step-down buck regulator may be practical for low­power applications. When you need 8-10 Amps, the task will be more challenging
and time consuming. It’s time to consider the high efficiency, ease-of-use, and
overall cost effectiveness of DA TEL's UNR Series. Safety agency approvals and
full EMI characterizations are currently in progress.

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Low cost!
+4.75V to +5.5V inputs
+3.3V (±33mV), 8 or 10 Amp outputs
200kHz, synchronous-rectifier topology
Low output noise, 40mVp-p
Quick transient response, 30µsec
High efficiencies: 92% for 8A, 91% 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

PWM

CONTROLLER

REFERENCE &

ERROR AMP

INPUT

RETURN

ON/OFF

C

ONTROL

OUTPUT
RETURN

CURRENT LIMITING
& S.C. SHUTDOWN

UNDERVOLTAGE

SHUTDOWN

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, 26W and 33W, 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-0430A 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

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-3.3/8-D5 Non-Isolated, 5V-to-3.3V, 26 Watt, DC/DC Converter
UNR-3.3/10-D5 Non-Isolated, 5V-to-3.3V, 33 Watt, DC/DC Converter

INNOVATION and EX C ELL E N C

E

®

®

PIN DIAMETERS:
MODEL UNR-3.3/8-D5, PINS 1-6: 0.040 ±0.002DIA. (1.016 ±0.051)
MODEL UNR-3.3/10-D5, PINS 1-2: 0.040 ±0.002DIA. (1.016 ±0.051)

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

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)

Case C5A

MECHANICAL SPECIFICATIONS

Performance/Functional Specifications

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

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.

Typical @ T

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

➀

Input

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

➁

: UNR-3.3/8-D5 0.1/5.74A

UNR-3.3/10-D5 0.15/7.25A

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% (±33mV) 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-3.3/8-D5 92% typical, 88% minimum

UNR-3.3/10-D5 91% typical, 86% 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