Data Sheet
May 19, 2009
NaOS
TM
NXA025 SMT Non-isolated Power Modules:
10Vdc – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A Output Current
RoHS Compliant
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z
versions)
Compliant to ROHS EU Directive 2002/95/EC with
lead solder exemption (non-Z versions)
Delivers up to 25A output current
High efficiency – 93% at 3.3V full load
Small size and low profile:
47.2 mm x 29.4 mm x 8.50 mm
(1.86 in x 1.16 in x 0.335 in)
Low output ripple and noise
Constant switching frequency (500 kHz)
Applications
Distributed power architectures
Intermediate bus voltage applications
Telecommunications equipment
Servers and storage applications
Networking equipment
Enterprise Networks
Latest generation IC’s (DSP, FPGA, ASIC)
and Microprocessor powered applications
Surface mount or through hole
Output voltage programmable from 0.8 Vdc to
5.5Vdc via external resistor
Remote On/Off
Remote Sense
Parallel operation with current sharing (-P option)
Output voltage sequencing (multiple modules)
Output overvoltage protection
Overtemperature protection
Output overcurrent protection (non-latching)
Wide operating temperature range (-40°C to 85°C)
UL*
60950-1Recognized,
CSA
C22.2 No. 60950-1-
‡
03 Certified, and
VDE
0805:2001-12 (EN60950-1)
Licensed
ISO** 9001 and ISO 14001 certified manufacturing
facilities
†
Options
Baseplate version for heatsink attachment
(-H suffix)
Through Hole version (-L)
Paralleling with current sharing (-P)
Description
The NXA025 series SMT (surface-mount technology) power modules are non-isolated dc-dc converters that can
deliver up to 25A of output current with full load efficiency of 93% at 3.3Vdc output voltage. These modules provide
a precisely regulated output voltage from 0.8Vdc to 5.5Vdc, programmable via an external resistor. Their open-
frame construction and small footprint enable designers to develop cost- and space-efficient solutions. Standard
features include remote On/Off, adjustable output voltage, remote sense, active current sharing between parallel
modules, output voltage sequencing of multiple modules, overcurrent, overvoltage, and overtemperature protection.
*
UL
is a registered trademark of Underwriters Laboratories, Inc.
†
‡
CSA
is a registered trademark of Canadian Standards Association.
VDE
is a trademark of Verband Deutscher Elektrotechniker e.V.
** ISO is a registered trademark of the International Organization of Standards
Document No: DS03-030 ver. 1.42
PDF name: nxa025_smt_ds.pdf
Data Sheet
May 19, 2009
Naos
TM
NXA025 SMT Non-isolated Power Modules:
10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are
absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in
excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for
extended periods can adversely affect the device reliability.
Parameter
Input Voltage
Continuous
Operating Ambient Temperature
(see Thermal Considerations section)
Storage Temperature
All
T
stg
-55
125
°C
All
T
A
-40
85
°C
Device
All
Symbol
V
IN
Min
-0.3
Max
14
Unit
Vdc
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Parameter
Operating Input Voltage
Maximum Input Current
(V
IN
=10.0V to 14.0V, I
O
=I
O, max
)
Inrush Transient
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 1μH source impedance; V
IN, min
to
V
IN, max,
I
O
= I
Omax
; See Test configuration section)
Input Ripple Rejection (120Hz)
All
All
All
It
60
50
2
Device
All
All
Symbol
V
IN
I
IN,max
Min
10.0
Typ
12.0
Max
14.0
14
1
Unit
Vdc
Adc
As
mAp-p
dB
2
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to being
part of a complex power architecture. To preserve maximum flexibility, internal fusing is not included, however, to
achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a fast-
acting fuse with a maximum rating of 30A (see Safety Considerations section). Based on the information provided in
this data sheet on inrush energy and maximum dc input current, the same type of fuse with a lower rating can be
used. Refer to the fuse manufacturer’s data sheet for further information.
LINEAGE
POWER
2
Data Sheet
May 19, 2009
Naos
TM
NXA025 SMT Non-isolated Power Modules:
10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current
Electrical Specifications
(continued)
Parameter
Output Voltage Set-point
(V
IN
=V
N, min
, I
O
=I
O, max
, T
A
=25°C)
Output Voltage
(Over all operating input voltage, resistive load,
and temperature conditions until end of life)
Adjustment Range
Selected by an external resistor
Output Regulation
Line (V
IN
=V
IN, min
to V
IN, max
)
Load (I
O
=I
O, min
to I
O, max
)
Temperature (T
ref
=T
A, min
to T
A, max
)
Output Ripple and Noise on nominal output
(V
IN
=V
IN, nom
and I
O
=I
O, min
to I
O, max
Cout = 2 * 0.47μF ceramic capacitors)
RMS (5Hz to 20MHz bandwidth)
Peak-to-Peak (5Hz to 20MHz bandwidth)
External Capacitance
ESR
≥
1 mΩ
ESR
≥
10 mΩ
Output Current
Output Current Limit Inception (Hiccup Mode )
Output Short-Circuit Current
(V
O
≤250mV)
( Hiccup Mode )
Efficiency
V
IN
= V
IN, nom
, T
A
=25°C
I
O
=I
O, max ,
V
O
= V
O,set
V
O,set
= 0.8Vdc
V
O, set
= 1.2Vdc
V
O,set
= 1.5Vdc
V
O,set
= 1.8Vdc
V
O,set
= 2.0Vdc
V
O,set
= 2.5Vdc
V
O,set
= 3.3Vdc
V
O,set
= 5.5Vdc
Switching Frequency
Dynamic Load Response
(dIo/dt=5A/μs; V
IN
= V
IN, nom
; T
A
=25°C)
Load Change from Io= 50% to 100% of
Io,max; No external output capacitors
Peak Deviation
Settling Time (Vo<10% peak deviation)
(dIo/dt=5A/μs; V
IN
= V
IN, nom
; T
A
=25°C)
Load Change from Io= 100% to 50%of Io,max:
No external output capacitors
Peak Deviation
Settling Time (Vo<10% peak deviation)
All
t
s
⎯
25
⎯
μs
All
All
t
s
V
pk
⎯
⎯
25
⎯
150
μs
mV
All
V
pk
⎯
150
mV
All
η
η
η
η
η
η
η
η
f
sw
⎯
79.0
84.7
87.3
88.9
89.7
91.4
93.1
95.1
500
⎯
%
%
%
%
%
%
%
%
kHz
All
All
All
All
All
C
O, max
C
O, max
I
o
I
O, lim
I
O, s/c
⎯
⎯
0
⎯
⎯
125
1
⎯
⎯
1000
10,000
25
150
⎯
μF
μF
Adc
% I
o
Adc
All
All
⎯
⎯
5
15
15
50
mV
rms
mV
pk-pk
All
All
All
⎯
⎯
⎯
0.01
0.1
0.5
0.1
0.2
1
% V
O, set
% V
O, set
% V
O, set
All
V
O
0.7887
5.5
Vdc
All
V
O, set
-3.0
⎯
+3.0
% V
O, set
Device
All
Symbol
V
O, set
Min
-1.2
Typ
⎯
Max
+1.2
Unit
% V
O, set
LINEAGE
POWER
3
Data Sheet
May 19, 2009
Naos
TM
NXA025 SMT Non-isolated Power Modules:
10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current
General Specifications
Parameter
Calculated MTBF (I
O
=80% of I
O, max
, T
A
=25°C)
Weight
⎯
Min
Typ
2,150,000
15.5 (0.55)
⎯
Max
Unit
Hours
g (oz.)
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
Parameter
SEQ/ENA Signal Interface
(V
IN
=V
IN, min
to V
IN, max
; open collector or equivalent,
Signal referenced to GND)
Logic High (SEQ/ENA pin open – Module Off)
SEQ/ENA Current
SEQ/ENA Voltage:
Logic Low (Module ON)
SEQ/ENA Current:
SEQ/ENA Voltage:
Turn-On Delay and Rise Times
(I
O
=I
O, max ,
V
o
to within
±1%
of steady state)
Output voltage overshoot – Startup
I
O
=80% of I
O, max
; V
IN
= 12Vdc, T
A
= 25 C
Ouptut Overvoltage Protection (Latching)
Input Undervoltage Lockout
Turn-on Threshold
Turn-off Threshold
Remote Sense Range
Overtemperature Protection
(See Thermal Consideration section)
Forced Load Share Accuracy
Number of units in Parallel
All
⎯
10
5
% Io
All
All
All
T
ref
8.1
―
⎯
―
125
0.5
⎯
9.9
V
V
V
°C
All
5.62
5.8
6.0
V
o
Device
Symbol
Min
Typ
Max
Unit
All
All
All
All
All
All
I
SEQ/ENA
V
SEQ/ENA
I
SEQ/ENA
V
SEQ/ENA
Tdelay
Trise
0.5
3.5
⎯
⎯
―
―
⎯
⎯
⎯
⎯
1
5
0.1
2.33
14
200
1.2
―
―
0.5
mA
V
μA
V
msec
msec
% V
O, set
LINEAGE
POWER
4
Data Sheet
May 19, 2009
Naos
TM
NXA025 SMT Non-isolated Power Modules:
10 – 14Vdc Input; 0.8Vdc to 5.5Vdc Output; 25A output current
Characteristic Curves
The following figures provide typical characteristics for the NXA025A0X –S at 25ºC.
88%
87%
86%
94%
93%
EFFICIENCY,
η
(%)
EFFICIENCY,
η
(%)
85%
84%
83%
82%
81%
80%
0
5
10
15
20
25
92%
91%
90%
89%
88%
0
5
10
15
20
25
Vin=1
3.2V
Vin=1
2.0V
Vin=1
0.8V
Vin=1
3.2V
Vin=1
2.0V
Vin=1
0.8V
OUTPUT CURRENT, I
O
(A)
OUTPUT CURRENT, I
O
(A)
Figure 1. Converter Efficiency versus Output Current
(Vout = 1.2Vdc).
91%
90%
Figure 4. Converter Efficiency versus Output Current
(Vout = 2.5Vdc).
95%
94%
EFFICIENCY,
η
(%)
88%
87%
86%
85%
84%
83%
0
5
10
15
20
25
EFFICIENCY,
η
(%)
89%
93%
92%
Vin=1
3.2V
91%
Vin=1
3.2V
Vin=1
2.0V
Vin=1
0.8V
Vin=1
2.0V
90%
Vin=1
0.8V
89%
88%
0
5
10
15
20
25
OUTPUT CURRENT, I
O
(A)
OUTPUT CURRENT, I
O
(A)
Figure 2. Converter Efficiency versus Output Current
(Vout = 1.5Vdc).
92%
91%
90%
89%
88%
Figure 5. Converter Efficiency versus Output Current
(Vout = 3.3Vdc).
97%
96%
95%
EFFICIENCY,
η
(%)
EFFICIENCY,
η
(%)
94%
93%
92%
91%
90%
89%
0
5
10
15
20
25
Vin=1
3.2V
Vin=1
2.0V
Vin=1
0.8V
Vin=1
3.2V
87%
Vin=1
2.0V
86%
Vin=1
0.8V
85%
0
5
10
15
20
25
OUTPUT CURRENT, I
O
(A)
OUTPUT CURRENT, I
O
(A)
Figure 3. Converter Efficiency versus Output Current
(Vout = 1.8Vdc).
Figure 6. Converter Efficiency versus Output Current
(Vout = 5.0Vdc).
LINEAGE
POWER
5
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