®
®
INNOVATION and EXCELLENCE
Single Output
USN D5 Models
Non-Isolated, 5V
IN
, 1.5-3.3V
OUT
8/10A DC/DC’s in SIP Packages
Features
■
■
■
■
■
Industry-standard SIP pinout
Shorter (2.0" vs. 2.5") package length
4.5-5.5V input range
1.5/1.8/2.5/3.3V outputs @ 8 or 10 Amps
Non-isolated, fully synchronous,
200kHz, buck topology
Superior performance vs. competitors:
•
8/10 Amps vs. 6 Amps
•
±1% setpoint accuracy
•
Efficiencies to 91%
•
Noise as low as 25mVp-p
•
Stable no-load operation
•
Wide-range trimmable output voltage
Remote on/off control; Optional sense pin
Power-good pin and "Lucent-compatible"
on/off control available
EN60950 and UL1950 certified
EMC compliant
■
■
■
■
■
DATEL’s new USN D5 Series SIP’s (single-in-line packages) are non-isolated
DC/DC converters that accept a 5V input (4.5V to 5.5V input range) and deliver 1.5V,
1.8V, 2.5V or 3.3V outputs at either 8 or 10 Amps. USN D5 SIP’s are designed to take
on-board 5V power and convert it, with the highest efficiency in the smallest space, to
any lower voltage required by today’s current-hungry DSP’s, ASIC’s and CPLD’s.
USN’s are ideal for true point-of-use power processing. They occupy a mere
0.8 square inches of board space (2" length, 0.4" width, 0.53" height). Their fully
synchronous, fixed-frequency (200kHz), buck topology delivers high efficiency (91%
for 3.3V
OUT
models), tight regulation (±0.1%/±0.5% line/load), stable no-load opera-
tion, and low output noise (25mVp-p for 1.5/1.8V
OUT
models).
The fully functional USN’s feature input undervoltage shutdown, output overcur-
rent detection, continuous short-circuit protection, a wide-range output-voltage trim
function, a remote on/off control pin, and an optional sense pin.
USN’s are pin compatible with similar devices from Lucent/Tyco, Artesyn Tech-
nologies and Power-One. USN’s, however, deliver more current (10A vs. 6A), from
a smaller package (2.0" vs. 2.5" long), with better accuracy (±1% max.), tighter
regulation, less noise, and superior temperature performance. If a USN SIP is
operated at only 6 Amps, for example, it can reliably operate up to +65°C (with
100lfm air flow).
If your low-voltage, high-current requirements have made the use of inefficient
linear regulators impractical, take a look at one of DATEL’s easy-to-use, low-cost
USN SIP’s. All devices are UL1950/EN60950 certified and EMC compliant. UL, CB
and EMC reports are available upon request.
+INPUT
+OUTPUT
+SENSE
➀
(OPTIONAL)
COMMON
COMMON
10kΩ
CURRENT
SENSE
ON/OFF
CONTROL
PWM
CONTROLLER
REFERENCE &
ERROR AMP
TRIM
➀
For devices with the sense-pin option ("R" suffix), the
feedback path is through the +Sense pin and not the
+Output pin.
Figure 1. Simplified Schematic
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
USN Series
N O N - I S O L AT E D , 1 2 - 3 3 W S I P D C / D C C O N V E R T E R S
Performance Specifications and Ordering Guide
Output
➀
Input
Regulation (Max.)
Line
Load
➂
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.625%
±0.625%
±0.625%
±0.625%
±0.5%
±0.5%
±0.5%
±0.5%
PRELIMINARY
Model
USN-1.5/8-D5
USN-1.5/10-D5
USN-1.8/8-D5
USN-1.8/10-D5
USN-2.5/8-D5
USN-2.5/10-D5
USN-3.3/8-D5
USN-3.3/10-D5
V
OUT
(Volts)
1.5
1.5
1.8
1.8
2.5
2.5
3.3
3.3
I
OUT
(Amps)
8
10
8
10
8
10
8
10
R/N (mVp-p)
➁
Typ.
Max.
25
25
25
25
30
30
30
30
50
50
50
50
60
60
60
60
V
IN
Nom.
(Volts)
5
5
5
5
5
5
5
5
Range
(Volts)
4.5-5.5
4.5-5.5
4.5-5.5
4.5-5.5
4.5-5.5
4.5-5.5
4.5-5.5
4.5-5.5
I
IN
➃
(mA)
50/2890
50/3570
50/3430
50/4190
50/4550
50/5620
50/5800
50/7250
Efficiency
Min.
Typ.
80%
80%
80%
80%
85%
85%
87%
87%
83%
84%
84%
86%
88%
89%
91%
91%
Package
(Case,
Pinout)
B4, P50
B4, P50
B4, P50
B4, P50
B4, P50
B4, P50
B4, P50
B4, P50
➀
Typical at T
A
= +25°C under nominal line voltage and full-load conditions, unless otherwise
noted. All models are tested and specified with an external 220µF input capacitor with a
100mΩ ESR and a 1.28Arms ripple-current rating, as well as a 220µF output capacitor with a
100mΩ ESR. See I/O Filtering and Noise Reduction for details.
➁
Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth. Output noise may be further
reduced by installing additional external output capacitors. 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.
P A R T
N U M B E R
S T R U C T U R E
T E M P E R AT U R E D E R AT I N G
U SN
-
1.8
/
10
-
D5 R
9
Temperature Derating for 8 Amp Models
V
IN
= Nominal
Output Configuration:
U
= Unipolar
Non-Isolated SIP
Nominal Output Voltage:
1.5, 1.8, 2.5 or 3.3 Volts
Maximum Rated Output
Current in Amps
8
Output Current (Amps)
R Suffix:
Remote Sense
(Pin 3 installed)
Input Voltage Range:
D5
= 4.5 to 5.5 Volts (5V nominal)
7
6
5
4
3
2
Still Air
100lfm Air Flow
200lfm Air Flow
300lfm Air Flow
M E C H A N I C A L
S P E C I F I C A T I O N S
1
2.00
(50.08)
0.40
(10.16)
0.24
(6.10)
0.53
(13.46)
0.025
(0.64)
0.05
(1.27)
0.05
(1.27)
0
–40 0
5
10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Ambient Temperature (
˚
C)
0.180
(4.57)
Case B4
1 2 3 4 5
6 7 8 9 10 11
Temperature Derating for 10 Amp Models
V
IN
= Nominal
12
Output Current (Amps)
0.400
(10.16)
4 EQ. SP. @
0.100 (2.54)
1.000
(25.40)
0.500
(12.70)
5 EQ. SP. @
0.100 (2.54)
0.160
(4.06)
10
8
DIMENSIONS ARE IN INCHES (MM)
* See Functional Options
in Technical Notes.
** Pin 3 (Sense) installed
for R suffix models.
I/O Connections
Pin Function P50*
1
+Output
2
+Output
3
No Pin**
4
+Output
5
Common
6
Common
7
+Input
8
+Input
9
No Pin
10
Trim
11
On/Off Control
6
4
Still Air
100lfm Air Flow
200lfm Air Flow
2
300lfm Air Flow
0
–40 0
5
10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Ambient Temperature (
˚
C)
2
N O N - I S O L AT E D , 1 2 - 3 3 W S I P D C / D C C O N V E R T E R S
USN Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions unless noted.
➀
Input
Input Voltage Range
Input Current:
Normal Operating Conditions
Standby/Off Mode
Input Ripple Current
Input Filter Type
Overvoltage Protection
Reverse-Polarity Protection
Undervoltage Shutdown
On/Off Control
➁ ➂
4.5 to 5.5 Volts (5V nominal)
See Ordering Guide
50µA typical, 200µA maximum
50mAp-p
Capacitive (66µF)
None
None
3.2-3.9 Volts
On = open or 2.4V to +V
IN
, I
IN
max. <400µA
Off = 0-0.8V, I
IN
max. <600µA
Length
Weight
Flamability Rating
Dimensions
Package
Pin:
Material
Physical
2" x 0.40" x 0.53" (50.8 x 10.2 x 13.5mm)
Open-frame, single-in-line (SIP)
0.025" (0.635mm) square bronze with
tin-lead plate over nickel underplate
0.180" (4.57mm)
0.3 ounces (8.5gm)
UL94V-0
Output
V
OUT
Accuracy
(50% load)
Minimum Loading
➃
V
OUT
Trim Range:
➁
Trim pin tied to +Output:
1.5V Models
1.8V Models
2.5V Models
3.3V Models
Trim pin tied to Common:
1.5V Models
1.8V Models
2.5V & 3.3V Models
Ripple/Noise
(20MHz BW)
➄
Line/Load Regulation
Efficiency
➁
Overcurrent Detection and
Short-Circuit Protection:
➁ ➅
Current-Limiting Detection Point:
8 Amp Models
10 Amp Models
Short-Circuit Detection Point
SC Protection Technique
Transient Response
(50% load step)
Start-Up Time:
➁
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency
MTBF:
8A Outputs (+50°C air)
10A Outputs (+45°C air)
Operating Temperature:
➁
(Ambient, 100lfm air flow)
Without Derating 8A/10A
With Derating
Storage Temperature
±1% maximum
No load
TBD
V
OUT
=
1.50 Volts (–17%)
V
OUT
=
1.77 Volts (–29%)
V
OUT
=
1.80 Volts (–45%)
TBD
V
OUT
= 3.0 Volts (+67%)
V
OUT
= 3.6 Volts (+44% and +9%)
See Ordering Guide
See Ordering Guide
See Ordering Guide
➀
All models are tested and specified with an external 220µF input capacitor with a 100mΩ
ESR and a 1.28Arms ripple-current rating, as well as a 220µF output capacitor with a
100mΩ ESR rating.
➁
See Technical Notes/Graphs for details.
➂
The On/Off Control is designed to be driven with open-collector logic or the application of
appropriate voltages (referenced to Common, pins 5 and 6). Applying a voltage to the
On/Off Control pin (pin 11) when no input voltage is applied to the converter may cause
permanent damage.
➃
All models are stable and regulate within spec under no-load conditions.
➄
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
➅
If an output short circuit results in a latched shutdown, the converter will have to be re-
started by cycling either the input voltage or the On/Off Control pin.
Absolute Maximum Ratings
Input Voltage:
Continuous
Transient (100msec)
On/Off Control Pin
(pin 11)
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
7 Volts
8 Volts
7 Volts
None
None
Current limited. Devices can
withstandsustainedoutputshort
circuits
without
damage.
–40 to +105°C
+300°C
Storage Temperature
10-12 Amps
13-15 Amps
<80% of rated output voltage
Latched shutdown
50µsec to ±1.5% of final value
900µsec
1msec
200kHz (±28kHz)
T E C H N I C A L
N O T E S
Lead Temperature
(soldering, 10 sec.)
Dynamic Characteristics
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.
Return Current Paths
The USN 12-33W D5 SIP’s are non-isolated DC/DC converters. Their two
Common pins (pins 5 and 6) are connected to each other internally (see
Figure 1). To the extent possible (with the intent of minimizing ground loops),
input return current should be directed through pin 6 (also referred to –Input
or Input Return), and output return current should be directed through
pin 5 (also referred to as –Output or Output Return). Any on/off control
signals applied to pin 11 (On/Off Control) should be referenced to Common
(specifically pin 6).
I/O Filtering and Noise Reduction
All models in the USN 12-33W D5 Series are tested and specified with
external 220µF input capacitors (100mΩ ESR, 1.28Arms ripple-current
rating) and external 220µF (100mΩ ESR) output capacitors. In critical
applications, input/output ripple/noise may be further reduced by installing
additional, external I/O caps.
Environmental
Bellcore, ground fixed, full power,
100lfm air flow
6 million hours
7 million hours
–40 to +45/50°C
to +100°C (See Derating Curves)
–40 to +105°C
3
USN Series
N O N - I S O L AT E D , 1 2 - 3 3 W S I P D C / D C C O N V E R T E R S
External input capacitors serve primarily as energy-storage devices. They
should be selected for bulk capacitance (at appropriate frequencies), low
ESR, and high rms-ripple-current ratings. The switching nature of modern
DC/DC converters requires that the dc input voltage source have low ac
impedance, and 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 specified limits 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.
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.
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 Engi-
neering Group for additional details.
Input Fusing
USN 12-33W D5 SIP Series DC/DC converters are not internally fused.
Certain applications and or safety agencies may require the installation of
fuses at the inputs of power conversion components. For DATEL USN D5
SIP Series DC/DC's, you should use either slow-blow or normal-blow fuses
with values no greater than the following.
Model
USN-1.5/8-D5
USN-1.5/10-D5
USN-1.8/8-D5
USN-1.8/10-D5
USN-2.5/8-D5
USN-2.5/10-D5
USN-3.3/8-D5
USN-3.3/10-D5
Fuse Value
6.5 Amps
7.5 Amps
7.5 Amps
9 Amps
10 Amps
12 Amps
12.5 Amps
15 Amps
+INPUT
10kΩ
ON/OFF
CONTROL
COMMON
Figure 2. Driving the Standard On/Off Control Pin
Dynamic control of the on/off function is best accomplished with a mechanical
relay or open-collector/open-drain drive circuit . The drive circuit should be
able to sink appropriate current when activated and withstand appropriate
voltage when deactivated.
Applying an external voltage to the On/Off Control pin 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 (control pin pulled low) while input power (system 5V power) is
ramping up and then "released" once the input has stabilized. The time dura-
tion between the point at which the converter is released and its fully loaded
output settles to within specified accuracy can be found in the Performance/
Functional Specifications Table. See Start-Up Time for more details.
The USN 12-33W D5 SIP Series converters are also available with a "Lucent
compatible" on/off control function. (Contact DATEL for model numbers and
availability.)
+INPUT
2kΩ
ON/OFF
CONTROL
665Ω
COMMON
Figure 3. Driving the "Lucent Compatible" On/Off Control Pin
Input Overvoltage and Reverse-Polarity Protection
USN D5 SIP Series DC/DC converters do not incorporate either input over-
voltage 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
The On/Off Control pin may be used for remote on/off operation. USN D5 SIP
Series DC/DC converters are designed so that they are enabled when the
control pin is pulled high (+2.4V to +V
IN
applied) or left open (normal mode)
and disabled when the control pin is pulled low (to less than +0.8V relative
to Common). As shown in Figure 2, all models have internal 10kΩ pull-up
resistors to V
IN
(+Input).
Start-Up Time
The V
IN
to V
OUT
Start-Up Time is the interval between the time at which a
ramping input voltage crosses the lower limit of the specified input voltage
range (4.5 Volts) 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
Remote 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. See Typical Performance Curves
for details
4
N O N - I S O L AT E D , 1 2 - 3 3 W S I P D C / D C C O N V E R T E R S
USN Models
Output Overvoltage Protection
USN D5 SIP Series DC/DC converters do not incorporate output overvoltage
protection. In the extremely rare situation in which the device’s feedback loop
is broken, the output voltage may run to excessively high levels (V
OUT
= V
IN
).
If it is absolutely imperative that you protect your load against any and all
possible overvoltage situations, voltage limiting circuitry must be provided
external to the power converter.
Output Overcurrent Detection
Overloading the output of a power converter for an extended period of
time will invariably cause internal component temperatures to exceed their
maximum ratings and eventually lead to component failure. High-current-
carrying components such as inductors, FET's and diodes are at the highest
risk. USN D5 SIP Series DC/DC converters incorporate an output overcur-
rent detection and shutdown function that serves to protect both the power
converter and its load.
When the output current exceeds the maximum rating by 20% (typical) to
35% (maximum), the internal overcurrent-detection circuit limits output cur-
rent. If the overload condition forces V
OUT
to fall below 80% of rated output,
the short-circuit detection circuit will latch the DC/DC into an off state. The
latched condition can be reset by cycling the input voltage to the converter or
by cycling the On/Off Control pin.
Output Voltage Trimming
Allowable trim ranges for each model in the USN D5 SIP Series are listed
in the Performance/Functional Specifications table. Trimming is accomplished
with either a trimpot or a single fixed resistor. The trimpot should be con-
nected between +Output and Common with its wiper connected to the Trim
pin as shown in Figure 4 below.
+OUTPUT
+INPUT
TRIM
COMMON
COMMON
Trim Up
Trim
Down
LOAD
Note:
Install either a fixed trim-up resistor or a fixed trim-down resistor
depending upon desired output voltage.
Figure 5. Trim Connections Using Fixed Resistors
USN-1.8/8-D5, USN-1.8/10-D5 Trim Equations
R
T
DOWN
(kΩ) =
2.55(V
O
– 1.23)
1.8 – V
O
3.14
V
O
– 1.8
– 2.21
R
T
UP
(kΩ) =
– 2.21
USN-2.5/8-D5, USN-2.5/10-D5 Trim Equations
R
T
DOWN
(kΩ) =
5.677(V
O
– 1.23)
2.5 – V
O
6.983
V
O
– 2.5
– 4.42
R
T
UP
(kΩ) =
– 4.42
USN-3.3/8-D5, USN-3.3/10-D5 Trim Equations
+OUTPUT
+INPUT
TRIM
COMMON
COMMON
20kΩ
5-10
Turns
LOAD
R
T
DOWN
(kΩ) =
4.46(V
O
– 1.24)
3.3 – V
O
5.512
V
O
– 3.3
– 1.74
R
T
UP
(kΩ) =
– 1.74
Figure 4. Trim Connections Using a Trimpot
Note: Resistor values are in kΩ. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted, initial output accuracy.
V
O
= desired output voltage.
Functional Options
USN Series SIP’s have been designed so that a “Power-Good” function can
be installed on Pin 9 (Contact DATEL). Standard models do not have a pin
in the Pin 9 position.
Also, the standard polarity of the USN’s On/Off Control function (pin 11 open
or pulled high = on) complies with industry standards. Nevertheless, it is not
compatible with the on/off polarity of the Lucent/Tyco NH020 Series SIP’s
(pin 9 open = off). Please contact DATEL if you would like us to modify
devices to be Lucent compatible.
A trimpot can be used to determine the value of a single fixed resistor
which should be connected, as shown in Figure 5, between the Trim pin
and +Output to trim down the output voltage, or between the Trim pin and
Common to trim up the output voltage. Fixed resistors should have absolute
TCR’s less than 100ppm/°C to ensure stability.
The equations below can be used as starting points for selecting specific
trim-resistor values. Recall that untrimmed devices are guaranteed to be
±1%
accurate.
5
Embedded System
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