®
®
INNOVATION and EXCELLENCE
Single Output
UNR Series
Non-Isolated, 1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
Features
Input ranges of 4.75-5.5V or 10.8-13.6V
Output voltages of 1.8/2.5/3.3V
8 and 10 Amp output current models
Non-isolated, full synchronous topology
1" x 2" through-hole package
High efficiency to 91%; Low noise
200kHz switching frequency
–40 to +40/50/60°C ambient operation with
no derating
Remote on/off control; Output overcurrent
detection
IEC950/EN60950/UL1950 approval
As supply voltages trend lower and load currents increase, centralized power
becomes more impractical. The tight accuracy, low noise and quick transient
response demanded by today's low voltage CPU's, ASIC's and DSP's make power
processing at the point of use the only viable solution. The UNR 18-33W series
provides a complete line of non-isolated DC/DC converters to satisfy this requirement. With input voltages of 5V (-D5 models) and 12V (-D12 models) these converters offer standard output voltages of 1.8, 2.5 and 3.3 Volts and up to 10 Amps of
output current in through-hole 1" x 2" metal cases.
With on/off control as a standard feature, these non-isolated converters exploit
full synchronous rectification, and 100% automated assembly to deliver high efficiencies (to 91%) and low noise at low cost.
These versatile DC/DC’s are fully line and load regulated. They feature quick
transient response (50µsec), user-optional on/off control (for power sequencing),
and output overcurrent detection and shutdown ("hiccup" technique with autorecovery). Their impressive guaranteed efficiencies enable them to deliver fully rated
output power from +40/50/60°C (ambient) without supplemental cooling.
If your high current requirements have made the use of inefficient linear regulators impractical, take a look at one of DATEL’s switching buck regulators. Their
high efficiency, ease-of-use, long-term reliability, and overall cost effectiveness will
impress you. Safety agency approvals and EMC characterizations are currently in
progress.
+VIN
+VOUT
INPUT
RETURN
OUTPUT
RETURN
➀
LOGIC
GROUND
VOLTAGE
BOOST
OVERCURRENT
DETECTION
+VCC
ON/OFF
CONTROL
PWM
CONTROLLER
REFERENCE &
ERROR AMP
➀ -D5 models only.
Figure 1. Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • Email: [email protected] • Internet: www.datel.com
UNR Series
N O N - I S O L AT E D , 1 8 - 3 3 W, 5 & 1 2 V- I N P U T D C / D C C O N V E R T E R S
Performance Specifications and Ordering Guide ➀
Output
Input
Load ➂
VIN Nom.
(Volts)
Range
(Volts)
IIN ➃
(mA/A)
Min.
Typ.
Package
(Case,
Pinout)
±0.5%
5
4.75-5.5
150/4190
82%
86%
C5A2, P9
±0.1%
±0.5%
5
4.75-5.5
100/4440
86%
90%
C5A1, P9
80
±0.1%
±0.5%
5
4.75-5.5
150/5620
85%
89%
C5A2, P9
R/N (mVp-p) ➁
Regulation (Max.)
VOUT
(Volts)
IOUT
(Amps)
Typ.
Max.
Line
UNR-1.8/10-D5
1.8
10
70
100
±0.1%
UNR-2.5/8-D5
2.5
8
40
80
UNR-2.5/10-D5
2.5
10
40
Model
Efficiency
UNR-3.3/8-D5
3.3
8
40
80
±0.1%
±0.5%
5
4.75-5.5
100/5740
88%
92%
C5A1, P9
UNR-3.3/10-D5
3.3
10
40
80
±0.1%
±0.5%
5
4.75-5.5
100/7250
86%
91%
C5A2, P9
UNR-2.5/8-D12
2.5
8
40
80
±0.1%
±0.625%
12
10.8-13.6
100/1890
85%
88%
C5A1, P9
UNR-2.5/10-D12
2.5
10
40
80
±0.1%
±0.625%
12
10.8-13.6
100/2410
83%
86%
C5C2, P9
UNR-3.3/8-D12
3.3
8
60
120
±0.1%
±0.625%
12
10.8-13.6
50/2440
86%
91%
C5A1, P9
UNR-3.3/10-D12
3.3
10
60
120
±0.1%
±0.625%
12
10.8-13.6
50/3090
86%
89%
C5C2, P9
➁ Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth. Output noise may be further
reduced by installing additional external output caps. See I/O Filtering and Noise Reduction.
➂ These devices have no minimum-load requirements and will regulate under no-load conditions.
➃ Nominal line voltage, no-load/full-load conditions.
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions, unless
otherwise noted. All models are tested and specified with an external 22µF output capacitor
with a 200mΩ ESR and a 470µF input capacitor with 6Arms ripple-current rating and 20mΩ
ESR. See I/O Filtering and Noise Reduction for more details.
PART NUMBER STRUCTURE
MECHANICAL SPECIFICATIONS
2.00
(50.80)
U NR - 1.8 / 10 - D5
METAL CASE
Case C5A1, A2, C2
*
Output Configuration:
U = Unipolar
Input Voltage Range:
D5 = 4.75 to 5.5 Volts (5V nominal)
D12 = 10.8 to 13.6 Volts (12V nominal)
Non-Isolated
Nominal Output Voltage:
1.8, 2.5 or 3.3 Volts
INSULATED BASE
0.20 MIN
(5.08)
Maximum Rated Output
Current in Amps
1.800
(45.72)
0.300
(7.62)
1
0.10
(2.54)
3
2
0.800
(20.32)
1.00
(25.40)
4
TEMPERATURE DERATING
0.400
(10.16)
5
6
BOTTOM VIEW
12
0.10
(2.54)
UNR-2.5/10-D5
UNR-3.3/10-D5
Output Current (Amps)
10
8
*CASE HEIGHT: 0.39 (9.91)
PIN DIAMETERS:
PINS 1-7: 0.040 ±0.002 (1.016 ±0.051)
UNR-2.5/8-D5
CASE C5A2
*CASE HEIGHT: 0.39 (9.91)
PIN DIAMETERS:
PINS 1-2: 0.040 ±0.002 (1.016 ±0.051)
PINS 3-6: 0.062 ±0.002 (1.575 ±0.051)
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UNR-1.8/8-D5
UNR-2.5/8-D12
UNR-3.3/8-D12
CASE C5C2
*CASE HEIGHT: 0.48 (12.19)
PIN DIAMETERS:
PINS 1-2: 0.040 ±0.002 (1.016 ±0.051)
PINS 3-6: 0.062 ±0.002 (1.575 ±0.051)
2
0
–40
0
10
20
30
0.200
(5.08)
CASE C5A1
UNR-2.5/10-D12
UNR-3.3/10-D12
4
DIMENSIONS ARE IN INCHES (MM)
40
50
60
70
80
90
100
Ambient Temperature (˚C)
2
I/O Connections
Pin
1
2
3
4
5
6
Function P23
Logic Ground
On/Off Control
+Output
Output Return
Input Return
+Input
UNR Models
N O N - I S O L AT E D, 1 8 - 3 3 W, 5 & 1 2 V- I N P U T D C / D C C O N V E RT E R S
Performance/Functional Specifications
Absolute Maximum Ratings
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀
Input Voltage:
Continuous:
D5 Models
D12 Models
Input
Input Voltage Range
D5 Models
D12 Models
4.75-5.5 Volts (5V nominal)
10.8-13.6 Volts (12V nominal)
Input Reverse-Polarity Protection
None
Input Current ➁
See Ordering Guide
Input/Output Overvoltage Protection
None
Input Filter Type
Capacitive
Output Current
Overvoltage Protection
None
Reverse-Polarity Protection
None
Current limited. Devices can
withstand a sustained output
short circuit without damage.
On/Off Control: ➂ ➃
TTL high (or open) = on, low = off
7 Volts
15 Volts
Storage Temperature
–40 to +105°C
Lead Temperature (Soldering, 10 sec.)
+300°C
Output
VOUT Accuracy (50% load):
1.8VOUT Models
2.5/3.3VOUT Models
±2% of VOUT maximum
±1% of VOUT maximum
Ripple/Noise (20MHz BW) ➄
See Ordering Guide
Line/Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Overcurrent Protection: ➁
8 Amp -D5 Models
10 Amp -D5 Models
8 Amp -D12 Models
10 Amp -D12 Models
9-15 Amps (12 Amps typical)
11-18 Amps (15 Amps typical)
9-15 Amps (12 Amps typical)
11-19 Amps (14 Amps typical)
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.
TECHNICAL NOTES
Return Current Paths
These are non-isolated DC/DC converters. The Input Return, Output Return
and Logic Ground pins are all connected together internally. To the extent
possible, all input and load currents should be returned through the Input
Return and Output Return, respectively (via low-impedance runs). Any control signals applied to the On/Off Control pin should be referenced to Logic
Ground. The internal trace leading to Logic Ground is not designed to carry
high current. Consequently, devices should never be installed in a manner
that results in high current flow through Logic Ground (i.e., the Input/Output
Return pins should never be left open or connected via high-impedance
paths).
Dynamic Characteristics
Transient Response (50-100% load):
1.8VOUT -D5 Models
2.5-3.3VOUT -D5 Models
2.5-3.3VOUT -D12 Models
60µsec to 2.5% VOUT
50µsec to 2.5% VOUT
50µsec to 1% VOUT
Switching Frequency
200kHz (±20kHz)
Environmental
Operating Temperature (Ambient):
Without Derating
With Derating
Storage Temperature
I/O Filtering and Noise Reduction
See Derating Curves
All models in the UNR 18-33W Series converters are tested and specified
with external 470µF input capacitors (20mΩ ESR, 6Arms ripple-current
rating) and external 22µF output capacitors (200mΩ ESR). In critical applications, input/output ripple/noise may be further reduced by installing additional
I/O caps.
to +100°C (See Derating Curves)
–40 to +105°C
Physical
Dimensions:
D5 Models
2.5V -D12 Models
3.3/8 -D12 Models
3.3/10 -D12 Models
2" x 1" x 0.39" (51 x 25 x 9.9mm)
2" x 1" x 0.48" (51 x 25 x 12.2mm)
2" x 1" x 0.39" (51 x 25 x 9.9mm)
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
C5A1, C5A2 Cases
C5C2 Case
1.4 ounces (39.7 grams)
1.76 ounces (49.4 grams)
External input capacitors serve primarily as energy-storage elements. They
should be selected for bulk capacitance (at appropriate frequencies), low
ESR, and high rms-ripple-current ratings. Input capacitors compensate for
I·R drops on input lines and power sources. Providing a solid input voltage
will greatly reduce the need for capacitors. The switching nature of modern
DC/DC converters requires that dc input voltage sources have low ac impedance, as highly inductive source impedances can affect system stability. Your
specific system configuration may necessitate additional considerations.
Output ripple/noise (also referred to as periodic and random deviations or
PARD) can be reduced below published specifications by using filtering
techniques, the simplest of which is the installation of additional external
output capacitors. Output capacitors function as true filter elements and
should be selected for bulk capacitance, low ESR, and appropriate frequency
response. Any scope measurements of PARD should be made directly at the
DC/DC output pins with scope probe ground less than 0.5" in length.
➀ All models are tested and specified with an external 470µF input capacitor rated for 6Arms
ripple current and an external 22µF output capacitor with an ESR lower than 200mΩ.
These devices 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 Applying an external voltage to the On/Off Control pin when no input voltage is applied can
cause permanent damage to the converter.
➃ See On/Off Control Functionality.
➄ Output noise may be further reduced with additional external capacitors across the output
terminals. Caps should have low ESR (typically 60mΩ) 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.
All external capacitors should have appropriate voltage ratings and be
located as close to the converters as possible. Temperature variations for all
relevant parameters should be taken into consideration.
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UNR Series
N O N - I S O L AT E D , 1 8 - 3 3 W, 5 & 1 2 V- I N P U T D C / D C C O N V E R T E R S
The most effective combination of external I/O capacitors will be a function
of your line voltage and source impedance, as well as your particular load
and layout conditions. Our Applications Engineers can recommend potential
solutions and discuss the possibility of our modifying a given device’s internal filtering to meet your specific requirements. Contact our Applications
Engineering Group for additional details.
Input Overvoltage and Reverse-Polarity Protection
UNR 18-33W Series DC/DC converters do not incorporate either input overvoltage or input reverse-polarity protection. Input voltages in excess of the
listed absolute maximum ratings and input polarity reversals of longer than
"instantaneous" duration can cause permanent damage to these devices.
On/Off Control Functionality
The On/Off Control pin has an internal 5kΩ pull-up resistor to +VIN. It can be
driven with any logic circuit capable of meeting the following requirements:
Logic "0" = 0 to +0.8V; Logic "1" = +2.0V to +VIN; IH (@VIN = +2.0V) = –0.7mA;
IIL (@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.
®
®
INNOVATION and EXCELLENCE
ISO 9001 REGISTERED
DS-0504
9/01
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01
DATEL GmbH München, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com
Email: [email protected]
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.
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