DATEL UNR-3.3-3-D12SM, UNR-2.5-2-D5SM, UNR-3.3-3-D5SM, UNR-1.8-2-D5SM Datasheet

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

Single Output

UNR SM Series

Features

Figure 1. Simplified Schematic

Surface-Mount, Non-Isolated

1.8/2.5/3.3V, 3.6-10W DC/DC Conv e rters

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INNOVATION and EX C ELL E N C E

®

®

DA TEL's ne w 3.6-10W UNR SM Series consists of non-isolated, 5V -to-1.8V (2A),
5V-to-2.5V (2A), 5V-to-3.3V (3A), and 12V-to-3.3V (3A) DC/DC converters in
miniature, 1" x 1" surface-mount packages. The "gull-wing" packages (with metal
shells and non-conductive plastic baseplates) weigh a mere 17 grams and can
withstand temperatures up to +235°C. They are compatible with virtually all contem­porary pick-and-place and solder-reflow processes.

The true benefits of distributed power will ultimately be realized only when every
low-voltage, high-current CPLD , ASIC, DSP, etc. has its own "power plant" right next
to it. With isolated DC/DC converters inevitably residing at the edges of boards in
proximity with backplanes and power buses, the "on-board" proliferation of distrib­uted power will continue with more cost-eff ective, non-isolated de vices. The low-cost,
easy-to-use (no external components required), highly reliable (100% fully auto­mated SMT construction) 3.6-10W UNR SM Series makes this power processing at
the concluding point of use a practical reality today .

These versatile DC/DC's are fully line and load regulated. The y feature user­optional on/off control (for power-sequencing requirements), output current limiting,
and short-circuit protection (foldback technique with auto-recovery). Additionally , the
12V -to-3.3V model offers input undervoltage lockout (at 9.6V). Their impressiv e
guaranteed efficiencies enable all models to deliver their fully rated output power from
–40 to +70°C (ambient) without heat sinking or forced-air cooling.

If you've already considered and rejected the use of inefficient, step-down, linear
regulators, take a look at one of these new s witching buck regulators. Their high
efficiency , ease-of-use, long-term reliability, and over all cost effectiveness will
impress you. Safety agency approvals are currently in progress.

Low cost! High reliability!
1" x 1" x 0.47", SMT package
Gull-wing leads; Standard reflow
Complete; No external components
Outputs: 1.8V/2A, 2.5V/2A, 3.3V/3A
Inputs: 4.75-5.5V , 10.4-13.6V
Guaranteed efficiencies to 87%
Output noise as low as 30mVp-p
T ransient response as quick as 20µsec
–40 to +70°C operation with no derating
On/off control; 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

À

À

"D5" models do not have input undervoltage shutdown.

Á

"D5" models employ a more traditional buck-regulator design
in which this FET is replaced with a power Schottky diode.

Á

UNR Series

NON-ISOLATED, 3.6-10W, SURFACE-MOUNT DC/DC CONVERTERS

MECHANICAL SPECIFICATIONS

1.00

(25.40)

0.45

(11.43)

0.055
(1.40)

0.020
(0.51)

0.110
(2.79)

0.015
(0.38)

METAL CASE

INSULATED BASE

4

3
2

1

8
7
6
5

9

0.10

(2.54)

0.110
(2.79)

0.100
(2.54)

0.300
(7.62)

0.500

(12.70)

TOP VIEW

1.00

(25.40)

0.800

(20.32)

4 EQ. SP.@

0.200 (5.08)

Case C17

I/O Connections

Pin Function P24

1N.C.
2 Logic Ground
3 On/Off Control
4N.C.
5 +Output
6N.C.
7 Output Return
8 Intput Return
9 +Input

Output Power (Watts)

Ambient Temperature (˚C)

UNR-3.3/3-D5SM, UNR-3.3/3-D12SM

UNR-2.5/2-D5SM

10

9

8

7

6

5

4

3

2

1

0

–400 404550556065707580859095100

UNR-1.8/2-D5SM

TEMPERATURE DERATING

Performance Specifications and Ordering Guide

IOUT

(Amps)

R/N (mVp-p)

Á

Load

Â

VOUT

(Volts)

Package

(Case,

Pinout)

Efficiency

Regulation (Max.)

Line

VIN Nom.

(Volts)

Range
(Volts)

Model

À

T ypical at TA = +25°C under nominal line voltage and full-load conditions, unless otherwise noted. The UNR-1.8/2-D5SM requires an
external 15k

Ω

pull-up resistor between VIN and On/Off Control for normal operation. See On/Off Control for details.

Á

Ripple/Noise (R/N) measured over a 20MHz bandwidth. The UNR-3.3/3-D12SM is specified with an external
22µF input capacitor. All other models are specified with no external I/O capacitors. Output noise on the "D12" model can be
reduced significantly with the addition of external output capacitors. See I/O Filtering.

Â

"D5" models require a minimum 300mA load current to maintain regulation. The "D12" model has no mimimum load requirement.
Listed specs apply from 300mA to full load for "D5" models and from no load to full load for the "D12" model.

Ã

Nominal line voltage, no-load/full-load conditions.

IIN Ã

(mA)

À

Max.

Typ.

Typ.

Min.

UNR-1.8/2-D5SM 1.8 2 40 75 ±0.35% ±0.35% 5 4.5-5.5 30/90 0 77% 79 % C17, P24
UNR-2.5/2-D5SM 2.5 2 30 50 ±0.25% ±0.5% 5 4.75-5.5 40/1180 83% 85% C17, P24
UNR-3.3/3-D5SM 3.3 3 30 45 ±0.4% ±0.5% 5 4.75-5.5 40/2250 86% 88% C17, P24
UNR-3.3/3-D12SM

Á

3.3 3 100 150 ±0.25% ±0.5% 12 10.4-13.6 40/930 87% 89% C17, P24

Output

Input

PART NUMBER STRUCTURE

Non-Isolated

Output Configuration:

U = Unipolar

Nominal Output Voltage:

1.8, 2.5 or 3.3 Volts

Maximum Output Current

in Amps

Input V oltage Range:

D5 = 4.75-5.5 Volts (5V nominal)

À

D12 = 10.4-13.6 Volts (12V nominal)

U NR 2-

/

D5 SM-2.5

Surface-Mount Packaging

À

4.5-5.5 Volts for UNR-1.8/2-D5SM

2

SM ModelsSM Models

SM ModelsSM Models

SM Models

NON-ISOLATED, 3.6-10W, SURFACE-MOUNT DC/DC CONVERTERS

Performance/Functional Specifications

T ypical @ TA = +25°C under nominal line voltage and full-load conditions with no e xternal filtering,
unless noted.

À

Input

Input V oltage Range:

"D5" Models:

UNR-1.8/2-D5SM 4.5-5.5 V olts (5V nominal)
UNR-2.5/2-D5SM, UNR-3.3/3-D5SM 4.75-5.5 Volts (5V nominal)

"D12" Models 10.4-13.6 Volts (12V nominal)

Overvoltage Shutdown None
Start-Up Threshold:

"D12" Models

Á

10.2V typical, 10.4V maximum

Undervoltage Shutdown:

"D12" Models

Á

9.6V typical, 8.2V minimum

Input Current:

Normal Operating Conditions See Ordering Guide
Standby Mode (Off or undervoltage):

UNR-1.8/2-D5SM 20mA typical, 30mA maximum
UNR-2.5/2-D5SM, UNR-3.3/3-D5SM 10mA typical, 20mA maximum
UNR-3.3/3-D12SM 5mA typical, 10mA maximum

Input Ripple Current:

UNR-1.8/2-D5SM, UNR-3.3/3-D12SM 50mArms
UNR-2.5/2-D5SM, UNR-3.3/3-D5SM 150mArms

Input Filter T ype Capacitive
Reverse-Polarity Protection None
On/Off Control (Pin 3)

Â

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

1.5V typical logic threshold

Output

VOUT Accuracy (50% load):

UNR-1.8/2-D5SM ±1.5% (±27mV) maximum
UNR-2.5/2-D5SM ±1.5% (±37.5mV) maximum
UNR-3.3/3-D5SM ±1.5% (±50mV) maximum
UNR-3.3/3-D12SM ±1% (±33mV) maximum

Temperature Coefficient ±0.02% per °C
Ripple/Noise (20MHz BW)

Ã

See Ordering Guide

Line/Load Regulation See Ordering Guide
Efficiency See Ordering Guide
Current Limiting

Ä

Auto-recovery

Dynamic Characteristics

Transient Response (50% load step):

UNR-1.8/2-D5SM 20µsec to ±0.5% of final value
UNR-2.5/2-D5SM, UNR-3.3/3-D12SM 30µsec to ±1% of final value
UNR-3.3/3-D5SM 40µsec to ±1% of final value

Start-Up Time:

Å

VIN to VOUT: "D5" Models 100msec typical, 120msec maximum

"D12" Models 13msec typical, 20msec maximum

On/Off to V

OUT: "D5" Models 60msec typical, 120msec maximum

"D12" Models 13msec typical, 20msec maximum

Switching Frequency 200kHz (±30kHz)

Environmental

Operating Temperature (Ambient):

Without Derating –40 to +70°C
With Derating to +100°C (See Derating Curves)

Storage Temperature –40 to +105°C

À

"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-D5SM requires an external 15

Ω

pull-up resistor between VIN and On/Off Control for
normal operation. See On/Off Control for details. The UNR-3.3/3-D12SM is specifiied with an
external 22µF input capacitor. See I/O Filtering for details.

Á

See Startup Threshold and Undervoltage Shutdown for details.

Â

See On/Off Control for details.

Ã

The 22µF external input capacitor required for the UNR-3.3/3-D12SM should be minimally
rated for 1.5Arms ripple current and 125m

Ω

ESR. Output noise for all models can be further

reduced with the installation of external output capacitors. See See I/O Filtering for details.

Ä

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.

Å

See Start-Up Time for details.

Physical

Dimensions 1" x 1" x 0.47" (25 x 25 x 11.9mm)
Shielding None
Case Connection None
Case Material Corrosion-resistant steel with

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

Pin Material Copper, tin plated
Weight 0.6 ounces (17 grams)

Input Voltage:

Continuous:

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

Transient (100msec):

"D5" Models 15 Volts
"D12" Models 24 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 T ab le is not implied.

Absolute Maximum Ratings

3