®
®
A SUBSIDIARY OF C&D TECHNOLOGIES
Single Output
UNR Series
Non-Isolated, 1.8/2.5/3.3V
OUT
3.6-10W DC/DC Converters
Features
Low cost! High reliability!
1" x 1" SMT or through-hole packages
Gull-wing leads; Standard reflow
Complete; No external components
Outputs: 1.8V/2A, 2.5V/2A, 3.3V/3A
Inputs: 4.75-5.5V, 10.8-13.6V
Guaranteed efficiencies to 87%
Output noise as low as 40mVp-p
Transient response as quick as 20µsec
–40 to +70°C operation with no derating
On/off control; EMC compliant
IEC950/EN60950/UL1950 approvals
Modifications and customs for OEM's
DATEL's 3.6-10W UNR 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 and through-hole packages. The "gull-wing" SMT packages
(with metal shells and non-conductive plastic baseplates) weigh a mere 17 grams
and can withstand lead temperatures up to +230°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-effective, non-isolated devices. The
low-cost, easy-to-use (no external components required), highly reliable (100% fully
automated SMT construction) 3.6-10W UNR 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. They feature user-
optional 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 models offer input undervoltage lockout (at 9.6V). Their impressive
guaranteed efficiencies enable all models to deliver their fully rated output power
from –40 to +65/70°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 switching buck regulators. Their
high efficiency, ease-of-use, long-term reliability, and overall cost effectiveness will
impress you. Safety agency approvals are currently in progress.
+V
IN
+V
OUT
➁
INPUT
RETURN
OUTPUT
RETURN
➀
LOGIC
GROUND
UNDERVOLTAGE
SHUTDOWN
ON/OFF
CONTROL
PWM
CONTROLLER
CURRENT LIMITING
& S.C. SHUTDOWN
REFERENCE &
ERROR AMP
Figure 1. Simplified Schematic
➀
"D5" models do not have input undervoltage shutdown.
➁
"D5" models employ a more traditional buck-regulator design
in which this FET is replaced with a power Schottky diode.
DATEL, Inc., Mansfield, MA 02048 (USA)
•
Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
•
Email: sales@datel.com
•
Internet: www.datel.com
UNR Series
N O N - I S O L AT E D , 3 . 6 - 1 0 W D C / D C C O N V E R T E R S
Performance Specifications and Ordering Guide
Output
Model
UNR-1.8/2-D5
UNR-1.8/2-D5SM
UNR-2.5/2-D5
UNR-2.5/2-D5SM
UNR-3.3/3-D5
UNR-3.3/3-D5SM
UNR-3.3/3-D12
➁
UNR-3.3/3-D12SM
➁
➀➄
Input
Regulation (Max.)
Line
±0.35%
±0.35%
±0.25%
±0.25%
±0.4%
±0.4%
±0.25%
±0.25%
V
OUT
(Volts)
1.8
1.8
2.5
2.5
3.3
3.3
3.3
3.3
I
OUT
(Amps)
2
2
2
2
3
3
3
3
R/N (mVp-p)
➁
Typ.
Max.
40
40
40
40
40
40
100
100
75
75
75
75
75
75
150
150
Load
➂
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
V
IN
Nom.
(Volts)
5
5
5
5
5
5
12
12
Range
(Volts)
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
4.75-5.5
10.8-13.6
10.8-13.6
I
IN
➃
(mA)
30/910
30/910
40/1180
40/1180
40/2250
40/2250
40/930
40/930
Efficiency
Min.
Typ.
77%
77%
83%
83%
86%
86%
87%
87%
79%
79%
85%
85%
88%
88%
89%
89%
Package
(Case,
Pinout)
C7A, P9
C17, P24
C7A, P9
C17, P24
C7A, P9
C17, P24
C7A, P9
C17, P24
➀
Typical at T
A
= +25°C under nominal line voltage and full-load conditions, unless otherwise
noted. The UNR-1.8/2-D5 and D5SM models require an external 15kΩ pull-up resistor between
+Input and On/Off Control for normal operation. See On/Off Control for details.
➁
Ripple/Noise (R/N) measured over a 20MHz bandwidth. The UNR-3.3/3-D12 and D12SM
models are specified with an external 22µF input capacitor. All other models are specified with
no external I/O capacitors. Output noise on the D12 models can be reduced significantly with
the addition of external output capacitors. See I/O Filtering.
➂
D5/D5SM models require a minimum 300mA load current to maintain regulation. D12/D12SM
models have no mimimum load requirement. Listed specs apply from 300mA to full load for
D5/D5SM models and from no load to full load for D12/D12SM models.
➃
Nominal line voltage, no-load/full-load conditions.
➄
D5/D5SM models may experience start-up problems if voltages greater than 1.0V (for 3.3V
models) or 1.2V (for 1.8/2.5V models) are present across the output pins during power-up.
M E C H A N I C A L S P E C I F I C AT I O N S
1.00
(25.40)
STANDOFFS
0.020
(0.51)
0.100
(2.54)
4
3
1.22
(30.99)
0.45
(11.43)
Case C7A
9
8
7
6
5
0.800
(20.32)
4 EQ. SP.@
0.200 (5.08)
0.500
(12.70)
0.20 MIN
(5.08)
0.040 ±0.002 DIA.
(1.016 ±0.051)
0.800
(20.32)
0.300
(7.62)
2
1
1.00
(25.40)
0.10
(2.54)
3
TOP VIEW
0.10
(2.54)
0.100
(2.54)
1
2
Case C17
0.400
(10.16)
1.00
(25.40)
0.800
1.00
(20.32) (25.40)
0.110
(2.79)
0.060
(1.52)
0.020
(0.51)
4
5
6
0.200
(5.08)
0.47
(11.94)
0.200
(5.08)
BOTTOM VIEW
PLASTIC CASE WITH AN INSULATED BASE
DIMENSIONS ARE IN INCHES (MM)
0.10
(2.54)
INSULATED BASE
METAL CASE
0.015
(0.38)
0.055
(1.40)
DIMENSIONS ARE IN INCHES (MM)
P A R T
N U M B E R
S T R U C T U R E
Pin
1
2
3
4
5
6
7
8
9
I/O Connections
Function P9
Logic Ground
On/Off Control
+Output
Output Return
Input Return
+Input
No Pin
No Pin
No Pin
Function P24
N.C.
Logic Ground
On/Off Control
N.C.
+Output
N.C.
Output Return
Input Return
+Input
U NR
-
2.5
/
2
-
D5 SM
Output Configuration:
U
= Unipolar
Non-Isolated
Nominal Output Voltage:
1.8, 2.5 or 3.3 Volts
Maximum Output Current
in Amps
Surface-Mount Packaging
Input Voltage Range:
D5
= 4.75-5.5 Volts (5V nominal)
D12
= 10.8-13.6 Volts (12V nominal)
2
N O N - I S O L AT E D , 3 . 6 - 1 0 W D C / D C C O N V E R T E R S
UNR Models
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions with no external filtering.
Specifications apply to both surface-mount and through-hole models, unless noted.
➀ ➆
Performance/Functional Specifications
Input
Input Voltage Range:
D5 Models
D12 Models
Overvoltage Shutdown
Start-Up Threshold:
D12 Models
➁
Undervoltage Shutdown:
D12 Models
➁
Input Current:
Normal Operating Conditions
Standby Mode (Off or undervoltage):
1.8V
OUT
2.5V
OUT
, 3.3V
OUT
D5 Models
3.3V
OUT
D12 Models
Output Short-Circuit Condition
Input Ripple Current:
1.8V
OUT
, 3.3V
OUT
D12 Models
2.5V
OUT
, 3.3V
OUT
D5 Models
Input Filter Type
Reverse-Polarity Protection
On/Off Control
➂
Physical
4.75-5.5 Volts (5V nominal)
10.8-13.6 Volts (12V nominal)
None
10.2V typical, 10.8V maximum
9.6V typical, 8.2V minimum
See Ordering Guide
20mA typical, 30mA maximum
11mA typical, 20mA maximum
5mA typical, 10mA maximum
50mArms
50mAp-p
150mAp-p
Capacitive
None
TTL high (or open) = on, low = off
1.5V typical logic threshold
Through Hole Package
Pin Material:
Surface Mount Package
Through Hole Package
Weight
Dimensions:
Surface Mount Package
Through Hole Package
Shielding:
Surface Mount Package
Through Hole Package
Case Connection
(Surface Mount)
Case Material:
Surface Mount Package
.
1" x 1" x 0.47" (25 x 25 x 11.9mm)
1" x 1" x 0.45" (25 x 25 x 11.4mm)
5-sided
None
Input/output return
Corrosion-resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Diallyl phthalate, UL94V-0 rated
Copper, tin plated
Brass, solder coated
0.6 ounces (17 grams)
Output
V
OUT
Accuracy
(50% load):
1.8V
OUT
Models
2.5V
OUT
Models
3.3V
OUT
D5 Models
3.3V
OUT
D12 Models
Temperature Coefficient
Ripple/Noise
(20MHz BW)
➃
Line/Load Regulation
Efficiency
Current Limiting
➄
Transient Response
(50% load step):
1.8V
OUT
Models
2.5V
OUT
, 3.3V
OUT
D12 Models
3.3V
OUT
D5 Models
Start-Up Time:
➅ ➆
V
IN
to V
OUT
: D5 Models
D12 Models
On/Off to V
OUT
: D5 Models
D12 Models
Switching Frequency
Operating Temperature
(Ambient):
Without Derating
With Derating
Storage Temperature
±1.75% (±32mV) maximum
±1.75% (±44mV) maximum
±1.5% (±50mV) maximum
±1% (±33mV) maximum
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
Auto-recovery
➀
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-D5 and D5SM require an external 15Ω pull-up resistor between +Input and
On/Off Control for normal operation. See On/Off Control for details. The UNR-3.3/3-D12 and
D12SM are specifiied with an external 22µF input capacitor. See I/O Filtering for details.
➁
See Startup Threshold and Undervoltage Shutdown for details.
➂
See On/Off Control for details.
➃
The 22µF external input capacitor required for the UNR-3.3/3-D12 and D12SM should be
minimally rated for 1.5Arms ripple current and 125mΩ ESR. Output noise for all models
can be further reduced with the installation of external output capacitors. See I/O Filtering
for details.
➄
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.
➅
See Start-Up Time for details.
➆
D5/D5SM models may experience start-up problems if voltages greater than 1.0V (for 3.3V
models) or 1.2V (for 1.8/2.5V models) are present across the output pins during power-up.
Absolute Maximum Ratings
Input Voltage:
Continuous:
D5 Models
D12 Models
Transient (100msec):
D5 Models
D12 Models
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
Dynamic Characteristics
20µsec to ±1% of final value
30µsec to ±1% of final value
40µsec to ±1% of final value
100msec typical, 120msec maximum
13msec typical, 20msec maximum
60msec typical, 120msec maximum
13msec typical, 20msec maximum
200kHz (±30kHz)
7 Volts
15 Volts
15 Volts
24 Volts
None
None
Current limited. Devices can
withstand a sustained output
short circuit without damage.
–40 to +105°C
+300°C
+230°C
Environmental
Storage Temperature
–40 to +65/70°C
to +100°C (See Derating Curves)
–40 to +105°C
Lead Temperature
Selective soldering (10 sec.)
Reflow soldering (75 sec.)
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.
3
UNR Series
N O N - I S O L AT E D , 3 . 6 - 1 0 W D C / D C C O N V E R T E R S
T E M P E R AT U R E D E R AT I N G
10
9
8
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For DATEL UNR Series 3.6-10 Watt DC/DC Converters, you
should use slow-blow type fuses with values no greater than the following.
Model Number
Fuse Value
UNR-1.8/2-D5/-D5SM
1.5 Amps
UNR-2.5/2-D5/-D5SM
2 Amps
UNR-3.3/3-D5/-D5SM
3 Amps
UNR-3.3/3-D12/-D12SM
1.5 Amps
Start-Up Threshold and Undervoltage Shutdown
(UNR-3.3/3-D12 and D12SM only)
Under normal start-up conditions, UNR-3.3/3-D12 and D12SM devices will
not begin to regulate until the ramping input voltage exceeds the Start-Up
Threshold Voltage (typically 10.2V). Once operating, devices will not turn off
until the input voltage drops below the Undervoltage Shutdown/Lockout limit
(typically 9.6V). Subsequent re-start will not occur until the input is brought
back up to the Start-Up Threshold. This built-in hysteresis obviously avoids
any indeterminate on/off conditions at a single voltage.
Start-Up Time
For the three D5 models (that do not have an input turn-on threshold), the V
IN
to V
OUT
Start-Up Time is the interval between the time a step input is applied
to the device and the fully loaded output voltage enters and remains within
its specified accuracy band.
For the UNR-3.3/3-D12 and D12SM, V
IN
to V
OUT
Start-Up Time is the interval
between the time at which a rapidly ramping input voltage crosses the turn-on
threshold point and the fully loaded output voltage enters and remains within
its specified accuracy band. Actual measured times will vary with input source
impedance, external input capacitance, and the slew rate and final value of
the input voltage as it appears to the converter.
The On/Off to V
OUT
Start-Up Time assumes the converter is turned off via
the On/Off Control with the nominal input voltage already applied to the
converter. The specification defines the interval between the time at which the
converter is turned on and the fully loaded output voltage enters and remains
within its specified accuracy band.
Internal circuit design of the 3.3V
OUT
models mandates that no voltages
greater than 1.0V be present on the output pins at power-up. 1.8V
OUT
and
2.5V
OUT
models can not have voltages greater than 1.2V present on their
output pins at power-up. Failure to comply may result in start-up problems.
UNR-3.3/3-D5
UNR-3.3/3-D5SM
UNR-3.3/3-D12
UNR-3.3/3-D12SM
Output Power (Watts)
7
6
5
4
3
2
1
0
–40
UNR-2.5/2-D5
UNR-2.5/2-D5SM
UNR-1.8/2-D5
UNR-1.8/2-D5SM
0
40
45
50
55
60
65
70
75
80
85
90
95
100
Ambient Temperature (˚C)
T E C H N I C A L
N O T E S
I/O Filtering and Noise Reduction
All D5 models of UNR 3.6-10W Series DC/DC converters achieve their
rated ripple and noise specifications without the use of external input/output
capacitors. The UNR-3.3/3-D12 and D12SM models are tested and specified
with a single, external 22µF input capacitor (minimally rated for 1.5Arms
ripple current and 120mΩ ESR).
In critical applications, input/output ripple/noise may be further reduced by
installing additional external I/O caps. Input capacitors, which function pri-
marily as energy-storage elements, should be selected for bulk capacitance,
low ESR and high rms-ripple-current ratings. Output capacitors, which func-
tion more as true filter elements, should be selected for bulk capacitance, low
ESR, and appropriate frequency response. All caps should have appropriate
voltage ratings and be mounted as close to the converters as possible.
Temperature variations for all parameters should obviously be taken into
consideration.
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 will be happy to recommend
potential solutions and can 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.
Return Current Paths
The Input Return, Output Return and Logic Ground are all connected to each
other internal to each device. To the extent possible, all load current should
be returned through the Output Return (via low-impedance runs) and all input
current returned through the Input Return. 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. Devices should
never be installed in a manner that results in high current flow through Logic
Ground (i.e., the Input/Output Returns should never be left open or attached
via high-impedance connections).
4
N O N - I S O L AT E D , 3 . 6 - 1 0 W D C / D C C O N V E R T E R S
UNR Models
On/Off Control
The On/Off Control pin may be used for remote on/off operation. UNR
3.6-10W Series converters are designed so that they are enabled when the
control pin is pulled high or left open (normal mode) and disabled when the
control pin is pulled low (to less than +0.8V relative to Logic Ground). As
shown in the figure and table below, each device has an internal pull-up
resistor on its On/Off Control pin whose value and voltage vary with model.
Dynamic control of the on/off function is best accomplished with a mechanical
relay or an open-collector/open-drain drive circuit (optically isolated if appro-
priate). The drive circuit should obviously be able to sink appropriate current
when activated and withstand appropriate voltage when deactivated.
Applying an external voltage to the On/Off Control when no input power
is applied to the converter can cause permanent damage to the converter.
The on/off control function, however, is designed such that the converter can
be disabled (pin 2/3 pulled low) while input power is ramping up and then
"released" once the input has stabilized. The time duration between the point
at which the converter is released and its fully loaded output voltage settles
to within specified accuracy can be found in the Performance/Functional
Specifications Table.
Solder Reflow
For UNR 3.6-10W Series surface-mount devices, the packages' gull-wing
leads are made of tin-plated (150 microinches) copper. The gull-wing configu-
ration, as opposed to "J" leads, was selected to keep the solder joints out
from under the package to minimize both heat conduction away from the
leads (into the partially encapsulated package) and IR shadowing effects.
Through a series of experiments, using 8 mil-thick, Sn63 solder paste and
single-layer test boards, we have determined that these units can withstand
any standard Sn63 solder-reflow temperature profile as long as the device
lead temperature does not exceed +230°C for longer than 75 seconds. Obvi-
ously, your optimal profile will be a function of many factors including paste
thickness, board thickness, number of conductive layers, copper weight, the
density of surrounding components, etc.
As shown in Figure 3, our tests have determined the optimal landing-pad size
to be 160 mils by 130 mils.
V
IP
+INPUT
0.015
(0.38)
R
EP
R
IP
ON/OFF
CONTROL
LOGIC GROUND
0.130*
(3.30)
0.100**
(2.54)
0.160*
(4.06)
0.110**
(2.79)
* PAD DIMENSION
** LEAD DIMENSION
Figure 2. Driving the On/Off Control Pin
Figure 3. PC Board Land Pattern
Model
UNR-1.8/2-D5/-D5SM
UNR-2.5/2-D5/-D5SM
UNR-3.3/3-D5/-D5SM
UNR-3.3/3-D12/-D12SM
Internal
Pull-Up
Resistor (R
IP
)
1kΩ
1kΩ
1kΩ
10kΩ
External
Pull-Up
Resistor (R
EP
)
15kΩ
N.A.
N.A.
N.A.
Internal
Pull-Up
Voltage (V
IP
)
1.8V
2.5V
3.3V
V
IN
5
Embedded System
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