Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0Vdc –5.5Vdc Input; 0.75Vdc to 3.63Vdc Output;10A Output Current
* 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: DS04-031 ver. 1.55
PDF name: lynx_po_smt.pdf
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
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 10A output current
High efficiency – 95% at 3.3V full load (VIN = 5.0V)
Small size and low profile:
33.0 mm x 13.5 mm x 8.28 mm
(1.30 in x 0.53 in x 0.326 in)
Low output ripple and noise
High Reliability:
Calculated MTBF = 15.7 M hours at 25oC Full-load
Constant switching frequency (300 kHz)
Output voltage programmable from 0.75 Vdc to
3.63Vdc via external resistor
Line Regulation: 0.3% (typical)
Load Regulation: 0.4% (typical)
Temperature Regulation: 0.4 % (typical)
Remote On/Off
Remote Sense(optional)
Over temperature 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
Description
Austin LynxTM SMT (surface mount technology) power modules are non-isolated dc-dc converters that can deliver
up to 10A of output current with full load efficiency of 95% at 3.3V output. These modules provide a precisely
regulated output voltage programmable via an external resistor from 0.75Vdc to 3.63Vdc over a wide range of input
voltage (VIN = 3.0 – 5.5Vdc). Their open-frame construction and small footprint enable designers to develop cost-
and space-efficient solutions. Standard features include remote On/Off, remote sense, programmable output
voltage, over current and over temperature protections.
RoHS Compliant
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 2
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 Device Symbol Min Max Unit
Input Voltage All VIN -0.3 5.8 Vdc
Continuous
Operating Ambient Temperature All TA -40 85 °C
(see Thermal Considerations section)
Storage Temperature All Tstg -55 125 °C
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Parameter Device Symbol Min Typ Max Unit
Operating Input Voltage VO,set ≤ VIN – 0.5V VIN 3.0
⎯ 5.5 Vdc
Maximum Input Current All IIN,max 10 Adc
(VIN= VIN, min to VIN, max, IO=IO, max VO,set = 3.3Vdc)
Input No Load Current VO,set = 0.75Vdc IIN,No load 25 mA
(VIN = 5.0Vdc, IO = 0, module enabled) VO,set = 3.3Vdc IIN,No load 30 mA
Input Stand-by Current All IIN,stand-by 1.5 mA
(VIN = 5.0Vdc, module disabled)
Inrush Transient All I2t 0.1 A2s
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 1μH source impedance; VIN, min to
VIN, max, IO= IOmax ; See Test configuration section)
All 100 mAp-p
Input Ripple Rejection (120Hz) All 30 dB
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 15A,
time-delay fuse (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.
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 3
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point All VO, set -2.0 VO, set +2.0 % VO, set
(VIN=VIN, min, IO=IO, max, TA=25°C)
Output Voltage All VO, set -3% ⎯ +3% % VO, set
(Over all operating input voltage, resistive load,
and temperature conditions until end of life)
Adjustment Range All VO 0.7525 3.63 Vdc
Selected by an external resistor
Output Regulation
Line (VIN=VIN, min to VIN, max) All
⎯ 0.3 ⎯ % VO, set
Load (IO=IO, min to IO, max) All
⎯ 0.4 ⎯ % VO, set
Temperature (Tref=TA, min to TA, max) All
⎯ 0.4 ⎯ % VO, set
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max
Cout = 1μF ceramic//10μFtantalum capacitors)
RMS (5Hz to 20MHz bandwidth) All ⎯ 8 15 mVrms
Peak-to-Peak (5Hz to 20MHz bandwidth) All ⎯ 25 50 mVpk-pk
External Capacitance
ESR ≥ 1 mΩ All CO, max ⎯ ⎯ 1000 μF
ESR ≥ 10 mΩ All CO, max ⎯ ⎯ 5000 μF
Output Current All Io 0 10 Adc
Output Current Limit Inception (Hiccup Mode ) All IO, lim ⎯ 220 ⎯ % Io
(VO= 90% of VO, set)
Output Short-Circuit Current All IO, s/c ⎯ 2 ⎯ Adc
(VO≤250mV) ( Hiccup Mode )
Efficiency VO,set = 0.75Vdc η 82.5 %
VIN= VIN, nom, TA=25°C VO, set = 1.2Vdc η 88.0 %
IO=IO, max , VO= VO,set V
O,set = 1.5Vdc η 89.5 %
V
O,set = 1.8Vdc η 91.0 %
V
O,set = 2.5Vdc η 93.0 %
V
O,set = 3.3Vdc η 95.0 %
Switching Frequency All fsw ⎯ 300 ⎯ kHz
Dynamic Load Response
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 200 ⎯ mV
Load Change from Io= 50% to 100% of
Io,max; 1μF ceramic// 10 μF tantalum
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 25 ⎯ μs
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 200 ⎯ mV
Load Change from Io= 100% to 50%of Io,max:
1μF ceramic// 10 μF tantalum
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 25 ⎯ μs
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 4
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Dynamic Load Response
(dIo/dt=2.5A/μs; V VIN = VIN, nom; TA=25°C) All Vpk ⎯ 100 ⎯ mV
Load Change from Io= 50% to 100% of Io,max;
Co = 2x150 μF polymer capacitors
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 100 ⎯ μs
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 100 ⎯ mV
Load Change from Io= 100% to 50%of Io,max:
Co = 2x150 μF polymer capacitors
Peak Deviation
Settling Time (Vo<10% peak deviation) All ts ⎯ 100 ⎯ μs
General Specifications
Parameter Min Typ Max Unit
Calculated MTBF (IO=IO, max, TA=25°C) 15,726,000 Hours
Telecordia SR-332 Issue 1: Method 1 Case 3
Weight ⎯ 5.6 (0.2) ⎯ g (oz.)
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 5
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
Parameter Device Symbol Min Typ Max Unit
On/Off Signal interface
(On/Off is open collector/drain logic input;
Signal referenced to GND - See feature description
section)
Input High Voltage (Module ON) All VIH ― ― V
IN, max V
Input High Current All IIH ― ― 10 μA
Input Low Voltage (Module OFF) All VIL -0.2 ― 0.3 V
Input Low Current All IIL ― 0.2 1 mA
Turn-On Delay and Rise Times
(IO=IO, max , VIN=VIN, nom, TA = 25 oC)
Case 1: On/Off input is set to Logic High (Module
ON) and then input power is applied (delay from
instant at which VIN = VIN, min until Vo=10% of Vo,set)
All Tdelay ― 3.9 ― msec
Case 2: Input power is applied for at least one second
and then the On/Off input is set to logic High (delay from
instant at which Von/Off=0.3V until Vo=10% of Vo, set)
All Tdelay ― 3.9 ― msec
Output voltage Rise time (time for Vo to rise from 10%
of Vo,set to 90% of Vo, set)
All Trise ― 4.2 8.5 msec
Output voltage overshoot – Startup ― 1 % VO, set
IO= IO, max; VIN = 3.0 to 5.5Vdc, TA = 25 oC
Remote Sense Range ― ― 0.5 V
Overtemperature Protection All Tref ⎯ 125 ⎯ °C
(See Thermal Consideration section)
Input Undervoltage Lockout
Turn-on Threshold All 2.2 V
Turn-off Threshold All 2.0 V
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 6
Characteristic Curves
The following figures provide typical characteristics for the Austin LynxTM SMT modules at 25ºC.
72
75
78
81
84
87
90
02.557.510
VIN = 5.5V
VIN = 5.0V
VIN = 3.0V
72
75
78
81
84
87
90
93
96
02.557.510
VIN = 5.5V
VIN = 5.0V
VIN = 3.0V
EFFICIENCY, (η)
OUTPUT CURRENT, IO (A)
EFFICIENCY, (η)
OUTPUT CURRENT, IO (A)
Figure 1. Converter Efficiency versus Output Current
(Vout = 0.75Vdc).
Figure 4. Converter Efficiency versus Output Current
(Vout = 1.8Vdc).
72
75
78
81
84
87
90
93
0 2.5 5 7.5 10
VIN = 5.5V
VIN = 5.0V
VIN = 3.0V
73
76
79
82
85
88
91
94
97
10 0
02.557.510
VIN = 5.5V
VIN = 5.0V
VIN = 3.0V
EFFICIENCY, (η)
OUTPUT CURRENT
,
I
O
(
A
)
EFFICIENCY, (η)
OUTPUT CURRENT
,
I
O
(
A
)
Figure 2. Converter Efficiency versus Output Current
(Vout = 1.2Vdc).
Figure 5. Converter Efficiency versus Output Current
(Vout = 2.5Vdc).
70
73
76
79
82
85
88
91
94
02.557.510
VIN = 5.5V
VIN = 5.0V
VIN = 3.0V
EFFICIENCY, (η)
OUTPUT CURRENT, IO (A)
EFFICIENCY, (η)
OUTPUT CURRENT, IO (A)
Figure 3. Converter Efficiency versus Output Current
(Vout = 1.5Vdc).
Figure 6. Converter Efficiency versus Output Current
(Vout = 3.3Vdc).
76
79
82
85
88
91
94
97
10 0
0 2.557.510
VIN = 5.5V
VIN = 5.0V
VIN = 4.5V
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 7
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin LynxTM SMT modules at 25ºC.
0
1
2
3
4
5
6
7
8
9
10
0.5 1.5 2.5 3.5 4.5 5.5
Io=5A
Io=0A
Io=10A
INPUT CURRENT, IIN (A)
INPUT VOLTAGE, VIN (V)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (5A/div) VO (V) (200mV/div)
TIME, t (10μs/div)
Figure 7. Input voltage vs. Input Current (Vo =
2.5Vdc).
Figure 10. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 3.3Vdc).
OUTPUT VOLTAGE
VO (V) (20mV/div)
TIME, t (2μs/div)
OUTPUT CURRENT, OUTPUT VOLTAG
IO (A) (5A/div) VO (V) (200mV/div)
TIME, t (10μs/div)
Figure 8. Typical Output Ripple and Noise (Vin = 5.0V
dc, Vo = 0.75 Vdc, Io=10A).
Figure 11. Transient Response to Dynamic Load
Change from 100% to 50% of full load (Vo = 3.3 Vdc).
OUTPUT VOLTAGE
VO (V) (20mV/div)
TIME, t (2μs/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (5A/div) VO (V) (50mV/div)
TIME, t (20μs/div)
Figure 9. Typical Output Ripple and Noise (Vin = 5.0V
dc, Vo = 3.3 Vdc, Io=10A).
Figure 12. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 3.3 Vdc,
Cext = 2x150 μF Polymer Capacitors).
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 8
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin LynxTM SMT modules at 25ºC.
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (5A/div) VO (V) (50mV/div)
TIME, t (20μs/div)
INPUT VOLTAGE OUTPUT VOLTAGE
VOn/off (V) (2V/div) VO (V)(1V/div)
TIME, t (2 ms/div)
Figure 13. Transient Response to Dynamic Load
Change from 100% of 50% full load (Vo = 5.0 Vdc, Cext
= 2x150
μ
F Pol
y
mer Ca
p
acitors
)
.
Figure 16. Typical Start-Up with application of Vin
(Vin = 5.5Vdc, Vo = 3.3Vdc, Io = 10A).
On/Off VOLTAGE OUTPUT VOLTAGE
VOn/off (V) (5V/div) VO (V)(1V/div)
TIME, t (2 ms/div)
INPUT VOLTAGE OUTPUT VOLTAGE
VOn/off (V) (2V/div) VO (V)(1V/div)
TIME, t (2 ms/div)
Figure 14. Typical Start-Up Using Remote On/Off (Vin
= 5.0Vdc, Vo = 3.3Vdc, Io = 10.0A).
Figure 17 Typical Start-Up Using Remote On/Off with
Prebias (Vin = 3.3Vdc, Vo = 1.8Vdc, Io = 1.0A, Vbias
=1.0Vdc).
On/Off VOLTAGE OUTPUT VOLTAGE
VOn/off (V) (5V/div) VO (V)(1V/div)
TIME, t (2 ms/div)
OUTPUT CURRENT,
IO (A) (10A/div)
TIME, t (10ms/div)
Figure 15. Typical Start-Up Using Remote On/Off with
Low-ESR external capacitors (Vin = 5.5Vdc, Vo =
3.3Vdc, Io = 10.0A, Co = 1050μF).
Figure 18. Output short circuit Current (Vin =
5.0Vdc, Vo = 0.75Vdc).
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 9
Characteristic Curves (continued)
The following figures provide thermal derating curves for the Austin LynxTM SMT modules.
0
2
4
6
8
10
12
20 30 40 50 60 70 80 90
NC
100 LFM
0
2
4
6
8
10
12
20 30 40 50 60 70 80 90
NC
100 LFM
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, T
A
O
C
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, T
A
O
C
Figure 19. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 5.0,
Vo=0.75Vdc).
Figure 22. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 5.0dc,
Vo=3.3 Vdc).
0
2
4
6
8
10
12
20 30 40 50 60 70 80 90
NC
100 LFM
0
2
4
6
8
10
12
20 30 40 50 60 70 80 90
N
C
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, T
A
O
C
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, T
A
O
C
Figure 20. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 5.0Vdc,
Vo=1.8 Vdc).
Figure 23. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 3.3Vdc,
Vo=2.5 Vdc).
0
2
4
6
8
10
12
20 30 40 50 60 70 80 90
NC
100 LFM
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, TA OC
Figure 21. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 5.0Vdc,
Vo=2.5 Vdc).
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 10
Test Configurations
TO OSCILLOSCOPE CURRENT PROBE
LTEST
1μH
BATTERY
CS 1000μF
Electrolytic
E.S.R.<0.1Ω
@ 20°C 100kHz
2x100μF
Tantalum
VIN(+)
COM
NOTE: Measure input reflected ripple current with a simulated
source inductance (LTEST) of 1μH. Capacitor CS offsets
possible battery impedance. Measure current as shown
above.
CIN
Figure 24. Input Reflected Ripple Current Test
Setup.
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
V
O
(+)
COM
1uF .
RESISTIVE
LOAD
SCOPE
COPPER STRIP
GROUND PLANE
10uF
Figure 25. Output Ripple and Noise Test Setup.
VO
COM
VIN(+)
COM
RLOAD
Rcontac t Rdistribution
Rcontac t Rdistribution
Rcontact
Rcontact
Rdistribution
Rdistribution
VIN VO
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Figure 26. Output Voltage and Efficiency Test Setup.
η =
VO. IO
VIN. IIN
x 100 %
Efficiency
Design Considerations
Input Filtering
Austin LynxTM SMT module should be connected to a
low-impedance source. A highly inductive source can
affect the stability of the module. An input capacitance
must be placed directly adjacent to the input pin of the
module, to minimize input ripple voltage and ensure
module stability.
To minimize input voltage ripple, low-ESR polymer and
ceramic capacitors are recommended at the input of the
module. Figure 27 shows input ripple voltage (mVp-p)
for various outputs with 1x150 µF polymer capacitors
(Panasonic p/n: EEFUE0J151R, Sanyo p/n:
6TPE150M) in parallel with 1 x 47 µF ceramic capacitor
(Panasonic p/n: ECJ-5YB0J476M, Taiyo- Yuden p/n:
CEJMK432BJ476MMT) at full load. Figure 28 shows
the input ripple with 2x150 µF polymer capacitors in
parallel with 2 x 47 µF ceramic capacitor at full load.
Input Ripple Voltage (mVp-p)
0
20
40
60
80
100
120
140
160
180
200
0 0.5 1 1.5 2 2.5 3 3.5
3.3Vin
5Vin
Output Voltage (Vdc)
Figure 27. Input ripple voltage for various output
with 1x150 µF polymer and 1x47 µF ceramic
capacitors at the input (full load).
Input Ripple Voltage (mVp-p)
0
20
40
60
80
100
120
140
0 0.5 1 1.5 2 2.5 3 3.5
3.3Vin
5Vin
Output Voltage (Vdc)
Figure 28. Input ripple voltage for various output
with 2x150 µF polymer and 2x47 µF ceramic
capacitors at the input (full load).
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 11
Design Considerations (continued)
Output Filtering
The Austin LynxTM SMT module is designed for low
output ripple voltage and will meet the maximum output
ripple specification with 1 µF ceramic and 10 µF
tantalum capacitors at the output of the module.
However, additional output filtering may be required by
the system designer for a number of reasons. First,
there may be a need to further reduce the output ripple
and noise of the module. Second, the dynamic
response characteristics may need to be customized to
a particular load step change.
To reduce the output ripple and improve the dynamic
response to a step load change, additional capacitance
at the output can be used. Low ESR polymer and
ceramic capacitors are recommended to improve the
dynamic response of the module. For stable operation
of the module, limit the capacitance to less than the
maximum output capacitance as specified in the
electrical specification table.
Safety Considerations
For safety agency approval the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standards,
i.e., UL 60950-1, CSA C22.2 No. 60950-1-03, and VDE
0850:2001-12 (EN60950-1) Licensed.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements. The power
module has extra-low voltage (ELV) outputs when all
inputs are ELV.
The input to these units is to be provided with a fast-
acting fuse with a maximum rating of 15A in the positive
input lead.
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 12
Feature Description
Remote On/Off
The Austin LynxTM SMT power modules feature an
On/Off pin for remote On/Off operation. The On/Off pin
is an open collector/drain logic input signal (Von/Off)
that is referenced to ground. Circuit configuration for
using the On/Off pin is shown in Figure 29. During a
logic-high (On/Off pin is pulled high internal to the
module) when the transistor Q1 is in the Off state, the
power module is ON. Maximum allowable leakage
current of the transistor when Von/off = VIN,max is 10µA.
Applying a logic-low when the transistor Q1 is turned-
On, the power module is OFF. During this state
VOn/Off must be less than 0.3V. When not using
positive logic On/off pin, leave the pin unconnected or
tie to VIN.
Q1
R2
R1
Q2
R3
R4
Q3 CSS
GND
VIN+
ON/OFF
PWM Enable
+
_
ON/OFF
V
ION/OFF
MODULE
Figure 29. Circuit configuration for using positive
logic On/OFF.
Remote Sense
The Austin LynxTM SMT power modules offer an option
for Remote Sense feature. When the device code
description includes a suffix “3”, sense pin is added to
the module and the Remote Sense feature is active.
See ordering information at the end of this document for
code description.
Remote sense minimizes the effects of distribution
losses by regulating the voltage at the load via Sense
and GND pins (see Figure 30). The voltage between
the Sense pin and Vo pin must not exceed 0.5V. The
amount of power delivered by the module is defined as
the output voltage multiplied by the output current (Vo x
Io). When using Remote Sense, the output voltage of
the module can increase, which if the same output is
maintained, increases the power output by the module.
Make sure that the maximum output power of the
module remains at or below the maximum rated power.
When the Remote Sense feature is not being used, tie
the Sense pin to output pin.
VO
COM
VIN(+ )
COM
RLOAD
Rcontact Rdistribution
Rcontact Rdistribution
Rcontact
Rcontact
Rdistribution
Rdistribution
Sense
Figure 32. Remote sense circuit configuration.
Overcurrent Protection
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
current-limiting circuitry and can endure current limiting
continuously. At the point of current-limit inception, the
unit enters hiccup mode. The unit operates normally
once the output current is brought back into its specified
range. The typical average output current during hiccup
is 3A.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, module operation is disabled. The module will
begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit will
shutdown if the thermal reference point Tref, exceeds
125oC (typical), but the thermal shutdown is not
intended as a guarantee that the unit will survive
temperatures beyond its rating. The module will
automatically restarts after it cools down.
Output Voltage Programming
The output voltage of the Austin LynxTM SMT can be
programmed to any voltage from 0.75 Vdc to 3.63 Vdc
by connecting a single resistor (shown as Rtrim in
Figure 31) between the TRIM and GND pins of the
module. Without an external resistor between the TRIM
pin and the ground, the output voltage of the module is
0.7525 Vdc. To calculate the value of the resistor Rtrim
for a particular output voltage Vo, use the following
equation:
Ω
⎥
⎦
⎤
⎢
⎣
⎡−
−
=5110
7525.0
21070
Vo
Rtrim
For example, to program the output voltage of the
Austin LynxTM II module to 1.8 Vdc, Rtrim is calculated is
follows:
Ω−
−
=⎥
⎦
⎤
⎢
⎣
⎡5110
7525.08.1
21070
Rtrim
Ω= kRtrim 004.15
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 13
Feature Descriptions (continued)
Output Voltage Programming (continued)
V
O
(+)
TRIM
GND
R
trim
LOAD
V
IN
(+)
ON/OFF
Figure 31. Circuit configuration for programming
output voltage using an external resistor.
Table 1 provides Rtrim values required for some
common output voltages.
Table 1
VO, (V) Rtrim (KΩ)
0.7525 Open
1.2 41.973
1.5 23.077
1.8 15.004
2.5 6.947
3.3 3.160
By a using 1% tolerance trim resistor, set point
tolerance of ±2% is achieved as specified in the
electrical specification. The POL Programming Tool,
available at www.lineagepower.com under the Design
Tools section, helps determine the required external
trim resistor needed for a specific output voltage.
The amount of power delivered by the module is defined
as the voltage at the output terminals multiplied by the
output current. When using the trim feature, the output
voltage of the module can be increased, which at the
same output current would increase the power output of
the module. Care should be taken to ensure that the
maximum output power of the module remains at or
below the maximum rated power (Pmax = Vo,set x Io,max).
Voltage Margining
Output voltage margining can be implemented in the
Austin LynxTM modules by connecting a resistor, Rmargin-
up, from the Trim pin to the ground pin for margining-up
the output voltage and by connecting a resistor, Rmargin-
down, from the Trim pin to the Output pin for margining-
down. Figure 32 shows the circuit configuration for
output voltage margining. The POL Programming Tool,
available at www.lineagepower.com under the Design
Tools section, also calculates the values of Rmargin-up and
Rmargin-down for a specific output voltage and % margin.
Please consult your local Lineage Power technical
representative for additional details.
Vo
Austin Lynx or
Lynx II Series
GND
Trim
Q1
Rtrim
Rmargin-up
Q2
Rmargin-down
Figure 32. Circuit Configuration for margining
Output voltage.
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 14
Thermal Considerations
The power modules operate in a variety of thermal
environments; however, sufficient cooling should always
be provided to help ensure reliable operation.
Considerations include ambient temperature, airflow,
module power dissipation, and the need for increased
reliability. A reduction in the operating temperature of
the module will result in an increase in reliability. The
thermal data presented here is based on physical
measurements taken in a wind tunnel. The test set-up
is shown in Figure 34. Note that the airflow is parallel to
the long axis of the module as shown in figure 33. The
derating data applies to airflow in either direction of the
module’s long axis.
Air Flow
Tref
To
p
View
Bottom View
Figure 33. Tref Temperature measurement location.
The thermal reference point, Tref used in the
specifications is shown in Figure 33. For reliable
operation this temperature should not exceed 115 oC.
The output power of the module should not exceed the
rated power of the module (Vo,set x Io,max).
Please refer to the Application Note “Thermal
Characterization Process For Open-Frame Board-
Mounted Power Modules” for a detailed discussion of
thermal aspects including maximum device
temperatures.
Figure 34. Thermal Test Set-up.
Heat Transfer via Convection
Increased airflow over the module enhances the heat
transfer via convection. Thermal derating curves
showing the maximum output current that can be
delivered at different local ambient temperature (TA) for
airflow conditions ranging from natural convection and
up to 2m/s (400 ft./min) are shown in the Characteristics
Curves section.
A
ir
flow
x
Po w e r M o d u le
W
ind Tunnel
PWBs
8.3_
(0.325)
76.2_
(3.0)
Probe Location
for measuring
airflow and
ambient
temperature
25.4_
(1.0)
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 15
Mechanical Outline
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
* Remote sense feature is a customer specified option (code suffix “3”)
PIN FUNCTION
1 On/Off
2 VIN
3 GND
4 VOUT
5 Trim
6 Sense*
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 16
Recommended Pad Layout
Dimensions are in millimeters and (inches).
Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.) [unless otherwise indicated]
x.xx mm ± 0.25 mm (x.xxx in ± 0.010 in.)
PIN FUNCTION
1 On/Off
2 VIN
3 GND
4 VOUT
5 Trim
6 Sense*
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 17
Packaging Details
The Austin LynxTM SMT version is supplied in tape & reel as standard. Modules are shipped in quantities of 400
modules per reel.
All Dimensions are in millimeters and (in inches).
Reel Dimensions
Outside diameter: 330.2 mm (13.00)
Inside diameter: 177.8 mm (7.00”)
Tape Width: 44.0 mm (1.73”)
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 18
Surface Mount Information
Pick and Place
The Austin LynxTM SMT modules use an open frame
construction and are designed for a fully automated
assembly process. The modules are fitted with a
label designed to provide a large surface area for pick
and place operations. The label meets all the
requirements for surface mount processing, as well as
safety standards, and is able to withstand reflow
temperatures of up to 300oC. The label also carries
product information such as product code, serial
number and location of manufacture.
Figure 35. Pick and place Location.
Nozzle Recommendations
The module weight has been kept to a minimum by
using open frame construction. Even so, these
modules have a relatively large mass when compared
to conventional SMT components. Variables such as
nozzle size, tip style, vacuum pressure and pick &
placement speed should be considered to optimize
this process. The minimum recommended nozzle
diameter for reliable operation is 3mm. The maximum
nozzle outer diameter, which will safely fit within the
allowable component spacing, is 12 mm max.
Tin Lead Soldering
The Austin LynxTM SMT power modules are lead free
modules and can be soldered either in a lead-free
solder process or in a conventional Tin/Lead (Sn/Pb)
process. It is recommended that the customer review
data sheets in order to customize the solder reflow
profile for each application board assembly. The
following instructions must be observed when
soldering these units. Failure to observe these
instructions may result in the failure of or cause
damage to the modules, and can adversely affect
long-term reliability.
In a conventional Tin/Lead (Sn/Pb) solder process
peak reflow temperatures are limited to less than
235oC. Typically, the eutectic solder melts at 183oC,
wets the land, and subsequently wicks the device
connection. Sufficient time must be allowed to fuse
the plating on the connection to ensure a reliable
solder joint. There are several types of SMT reflow
technologies currently used in the industry. These
surface mount power modules can be reliably
soldered using natural forced convection, IR (radiant
infrared), or a combination of convection/IR. For
reliable soldering the solder reflow profile should be
established by accurately measuring the modules CP
connector temperatures.
REFLOW TEMP (°C)
0
50
10 0
15 0
200
250
300
Preheat zone
max 4
o
Cs
-1
Soak zone
30-240s
Heat zone
max 4
o
Cs
-1
Peak Temp 235
o
C
Co o ling
zo ne
1- 4
o
Cs
-1
T
lim
above
205
o
C
REFLOW TIME (S)
Figure 35. Reflow Profile for Tin/Lead (Sn/Pb)
process.
MAX TEMP SOLDER (°C)
200
205
210
215
220
225
230
235
240
0 102030405060
Figure 36. Time Limit Curve Above 205oC Reflow
for Tin Lead (Sn/Pb) process.
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 19
Surface Mount Information (continued)
Lead Free Soldering
The –Z version Austin Lynx Programmable SMT
modules are lead-free (Pb-free) and RoHS compliant
and are both forward and backward compatible in a
Pb-free and a SnPb soldering process. Failure to
observe the instructions below may result in the
failure of or cause damage to the modules and can
adversely affect long-term reliability.
Pb-free Reflow Profile
Power Systems will comply with J-STD-020 Rev. C
(Moisture/Reflow Sensitivity Classification for
Nonhermetic Solid State Surface Mount Devices) for
both Pb-free solder profiles and MSL classification
procedures. This standard provides a recommended
forced-air-convection reflow profile based on the
volume and thickness of the package (table 4-2). The
suggested Pb-free solder paste is Sn/Ag/Cu (SAC).
The recommended linear reflow profile using
Sn/Ag/Cu solder is shown in Figure. 37.
MSL Rating
The Austin Lynx Programmable SMT modules have a
MSL rating of 1.
Storage and Handling
The recommended storage environment and handling
procedures for moisture-sensitive surface mount
packages is detailed in J-STD-033 Rev. A (Handling,
Packing, Shipping and Use of Moisture/Reflow
Sensitive Surface Mount Devices). Moisture barrier
bags (MBB) with desiccant are required for MSL
ratings of 2 or greater. These sealed packages
should not be broken until time of use. Once the
original package is broken, the floor life of the product
at conditions of <= 30°C and 60% relative humidity
varies according to the MSL rating (see J-STD-033A).
The shelf life for dry packed SMT packages will be a
minimum of 12 months from the bag seal date, when
stored at the following conditions: < 40° C, < 90%
relative humidity.
Post Solder Cleaning and Drying
Considerations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The
result of inadequate cleaning and drying can affect
both the reliability of a power module and the
testability of the finished circuit-board assembly. For
guidance on appropriate soldering, cleaning and
drying procedures, refer to Board Mounted Power
Modules: Soldering and Cleaning Application Note
(AN04-001).
Per J-STD-020 Rev. C
0
50
100
150
200
250
300
Reflow Time (Seconds)
Reflow Temp (°C)
Heating
Zone
Peak Tem
p
* Min. Time
Above 235°C
*Time Above
217°C
Cooling
Zone
Figure 37. Recommended linear reflow profile
using Sn/Ag/Cu solder.
Data Sheet
October 2, 2009
Austin LynxTM SMT Non-isolated Power Modules:
3.0 – 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
LINEAGE POWER 20
Document No: DS04-031 ver. 1.55
PDF name: lynx_po_smt.pdf
Ordering Information
Please contact your Lineage Power Sales Representative for pricing, availability and optional features.
Table 2. Device Codes
Device Code
Input
Voltage
Range
Output
Voltage
Output
Current
Efficiency
3.3V@ 10A
Connector
Type Comcodes
AXH010A0X-SR 3.0 – 5.5Vdc 0.75 – 3.63Vdc 10 A 95.0% SMT 108992021
AXH010A0X-SRZ 3.0 – 5.5Vdc 0.75 – 3.63Vdc 10 A 95.0% SMT CC109104948
AXH010A0X3-SR* 3.0 – 5.5Vdc 0.75 – 3.63Vdc 10 A 95.0% SMT 108992038
AXH010A0X3-SRZ* 3.0 – 5.5Vdc 0.75 – 3.63Vdc 10 A 95.0% SMT CC109104931
* Remote sense feature is active and pin 6 is added with code suffix “3”
* -Z refers to RoHS-compliant versions.
World Wide Headquarters
Lineage Power Corporation
601 Shiloh Road, Plano, TX 75074, USA
+1-800-526-7819
(Outside U.S.A.: +1-972-244-9428)
www.lineagepower.com
e-mail: techsupport1@lineagepower.com
Asia-Pacific Headquarters
Tel: +65 6593 7211
Europe, Middle-East and Africa Headquarters
Tel: +49 898 780 672 80
India Headquarters
Tel: +91 80 28411633
Lineage Power reserves the right to make change s to the product(s) or information contained herein without not ice. No liability is assumed as a result of their use or
a
pplication. No rights under any patent accompany the sale of any such product(s) or information.
Lineage Power DC-DC products are protected under various patents. Information on these patents is available at www.lineagepower.com/patents.
©
2009 Linea
g
e Power Cor
p
oration
,
(
Plano
,
Texas
)
All Inte rnational Ri
g
hts Reserved.
