Data Sheet
September 10, 2013
Austin MinilynxTM SMT Non-isolated Power Modules:
2.4Vdc –5.5Vdc input; 0.75Vdc to 3.63Vdc Output;3A 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: DS04-026 ver. 1.13
PDF name: minilynx_smt_ds.pdf
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 3A output current
High efficiency – 94% at 3.3V full load (VIN = 5.0V)
Small size and low profile:
20.3 mm x 11.4 mm x 7.27 mm
(0.80 in x 0.45 in x 0.286 in)
Low output ripple and noise
High Reliability:
Calculated MTBF = 11.9M 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: 0.4% (typical)
Load Regulation: 0.4% (typical)
Temperature Regulation: 0.4 % (typical)
Remote On/Off
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
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
Description
Austin MiniLynxTM SMT (surface mount technology) power modules are non-isolated dc-dc converters that can
deliver up to 3A of output current with full load efficiency of 94.0% 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 = 2.4 – 5.5Vdc). Their open-frame construction and small footprint enable designers to
develop cost- and space-efficient solutions.
RoHS Compliant
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A 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 2.4
⎯ 5.5 Vdc
Maximum Input Current All IIN,max 3.0 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 10 mA
(VIN = 5.0Vdc, IO = 0, module enabled) VO,set = 3.3Vdc IIN,No load 17 mA
Input Stand-by Current All IIN,stand-by 0.6 mA
(VIN = 5.0Vdc, module disabled)
Inrush Transient All I2t 0.04 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 35 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 fast-
acting fuse with a maximum rating of 6 A (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
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A 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=IN, 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
⎯ 0.4 ⎯ % 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 ⎯ 10 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 3 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 81.5 %
VIN= VIN, nom, TA=25°C VO, set = 1.2Vdc η 87.0 %
IO=IO, max , VO= VO,set V
O,set = 1.5Vdc η 89.0 %
V
O,set = 1.8Vdc η 90.0 %
V
O,set = 2.5Vdc η 93.0 %
V
O,set = 3.3Vdc η 94.0 %
Switching Frequency All fsw ⎯ 300 ⎯ kHz
Dynamic Load Response
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 250 ⎯ 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 ⎯ 50 ⎯ μs
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 250 ⎯ 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 ⎯ 50 ⎯ μs
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A 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 ⎯ 60 ⎯ 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 ⎯ 60 ⎯ 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) 11,965,153 Hours
Weight ⎯ 2.8 (0.1) ⎯ g (oz.)
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A 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
Device code with Suffix “4” – Positive logic
(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
Device Code with no suffix – Negative Logic
(On/OFF pin is open collector/drain logic input with
external pull-up resistor; signal referenced to GND)
Input High Voltage (Module OFF) All VIH 1.5 ― V
IN,max Vdc
Input High Current All IIH 0.2 1 mA
Input Low Voltage (Module ON) All VIL -0.2 ― 0.3 Vdc
Input low Current All IIL ― 10 μA
Turn-On Delay and Rise Times
(IO=IO, max , VIN = VIN, nom, TA = 25 oC, )
Case 1: On/Off input is set to Logic Low (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 Low (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
Overtemperature Protection All Tref ⎯ 140 ⎯ °C
(See Thermal Consideration section)
Input Undervoltage Lockout
Turn-on Threshold All 2.2 V
Turn-off Threshold All 2.0 V
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 6
Characteristic Curves
The following figures provide typical characteristics for the Austin MiniLynxTM SMT modules at 25ºC.
EFFICIENCY, η (%)
70
73
76
79
82
85
88
91
94
0 0 .6 1.2 1.8 2.4 3
VIN = 5.0V
VIN = 3.3V
VIN = 2.5V
EFFICIENCY, η (%)
73
76
79
82
85
88
91
94
97
00.61.21.82.43
VIN = 5.0V
VIN = 3.3V
VIN = 2.5V
OUTPUT CURRENT, IO (A) OUTPUT CURRENT, IO (A)
Figure 1. Converter Efficiency versus Output Current
(Vout = 0.75Vdc).
Figure 4. Converter Efficiency versus Output Current
(Vout = 1.8Vdc).
EFFICIENCY, η (%)
70
73
76
79
82
85
88
91
94
0 0 .6 1.2 1.8 2 .4 3
VIN = 5.0V
VIN = 3.3V
VIN = 2.5V
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A) OUTPUT CURRENT, IO (A)
Figure 2. Converter Efficiency versus Output Current
(Vout = 1.2Vdc).
Figure 5. Converter Efficiency versus Output Current
(Vout = 2.5Vdc).
EFFICIENCY, η (%)
72
75
78
81
84
87
90
93
96
0 0 .6 1.2 1.8 2 .4 3
VIN = 5.0V
VIN = 3.3V
VIN = 2.5V
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A) OUTPUT CURRENT, IO (A)
Figure 3. Converter Efficiency versus Output Current
(Vout = 1.5Vdc).
Figure 6. Converter Efficiency versus Output Current
(Vout = 3.3Vdc).
74
77
80
83
86
89
92
95
98
0 0.6 1.2 1.8 2.4 3
V
IN
= 5.0V
V
IN
= 4.0V
V
IN
= 3.3V
75
78
81
84
87
90
93
96
99
0 0.6 1.2 1.8 2.4 3
V
IN
= 5.5V
V
IN
= 5.0V
V
IN
= 4.0V
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 7
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin MiniLynxTM SMT modules at 25ºC.
INPUT CURRENT, IIN (A)
0
0.5
1
1. 5
2
2.5
3
3.5
012345
Io=1.5A
Io=0A
Io=3A
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (100mV/div)
INPUT VOLTAGE, VIN
(
V
)
TIME
,
t
(
20
μ
s/div
)
Figure 7. Input voltage vs. Input Current
(Vout =2.5Vdc).
Figure 10. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 3.3Vdc).
OUTPUT VOLTAGE
VO (V) (10mV/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (100mV/div)
TIME, t (1μs/div) TIME, t (20 μs/div)
Figure 8. Typical Output Ripple and Noise
(VIN = 5.0V dc, Vo = 0.75Vdc, Io=3A).
Figure 11. Transient Response to Dynamic Load
Change from 100% to 50% of full load (Vo = 3.3 Vdc).
OUTPUT VOLTAGE
VO (V) (10mV/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (20mV/div)
TIME, t (1μs/div) TIME, t (100μs/div)
Figure 9. Typical Output Ripple and Noise
(VIN = 5.0V dc, Vo = 3.3Vdc, Io=3A).
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
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 8
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin MiniLynxTM SMT modules at 25ºC.
OUTPUT CURRENT, OUTPUTVOLTAGE
IO (A) (2A/div) VO (V) (20mV/div)
INPUT VOLTAG OUTPUT VOLTAGE
VIN (V) (2V/div) VO (V) (1V/div)
TIME, t (100μs/div) TIME, t (2ms/div)
Figure 13. Transient Response to Dynamic Load
Change from 100% of 50% full load (Vo = 3.3Vdc, Cext
= 2x150
μ
F Pol
y
mer Ca
p
acitors
)
.
Figure 16. Typical Start-Up with application of Vin
(VIN = 5.0Vdc, Vo = 3.3Vdc, Io = 3A).
ON/OFF VOLTAGE OUTPUT VOLTAGE
VOn/off(V) (2V/div) VO (V) (1V/div)
ON/OFF VOLTAGE OUTPUT VOLTAGE
VOn/off(V) (2V/div) VO (V) (0.5V/div)
TIME, t (2ms/div) TIME, t (2ms/div)
Figure 14. Typical Start-Up Using Remote On/Off
(VIN = 5.0Vdc, Vo = 3.3Vdc, Io = 3A).
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) (2V/div) VO (V) (1V/div)
OUTPUT CURRENT,
IO (A) (5A/div)
TIME, t (2ms/div) TIME, t (10ms/div)
Figure 15. Typical Start-Up Using Remote On/Off with
Low-ESR external capacitors (7x150uF Polymer)
(VIN = 5.0Vdc, Vo = 3.3Vdc, Io = 3A, Co = 1050μF).
Figure 18. Output short circuit Current
(VIN = 5.0Vdc, Vo = 0.75Vdc).
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 9
Characteristic Curves (continued)
The following figures provide thermal derating curves for the Austin MiniLynxTM SMT modules.
OUTPUT CURRENT, Io (A)
0
0.5
1
1. 5
2
2.5
3
3.5
20 30 40 50 60 70 80 90
0 LFM
OUTPUT CURRENT, Io (A)
0
0.5
1
1. 5
2
2.5
3
3.5
20 30 40 50 60 70 80 90
0 LFM
AMBIENT TEMPERATURE, TA
O
C AMBIENT TEMPERATURE, TA
O
C
Figure 19. Derating Output Current versus Local
Ambient Temperature and Airflow (VIN = 5.0,
Vo=3.3Vdc).
Figure 22. Derating Output Current versus Local
Ambient Temperature and Airflow (VIN = 3.3dc,
Vo=2.5 Vdc).
OUTPUT CURRENT, Io (A)
0
0.5
1
1. 5
2
2.5
3
3.5
20 30 40 50 60 70 80 90
0 LFM
0
0.5
1
1. 5
2
2.5
3
3.5
20 30 40 50 60 70 80 90
0 LFM
AMBIENT TEMPERATURE, TA
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 = 3.3dc,
Vo=1.2 Vdc).
OUTPUT CURRENT, Io (A)
0
0.5
1
1. 5
2
2.5
3
3.5
20 30 40 50 60 70 80 90
0 LFM
0
0.5
1
1. 5
2
2.5
3
3.5
20 30 40 50 60 70 80 90
0 LFM
AMBIENT TEMPERATURE, T
A
O
C
Figure 21. Derating Output Current versus Local
Ambient Temperature and Airflow (VIN = 5.0Vdc,
Vo=0.75 Vdc).
Figure 24. Derating Output Current versus Local
Ambient Temperature and Airflow (VIN = 3.3dc,
Vo=0.75 Vdc).
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A 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 25. 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 26. 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 27. Output Voltage and Efficiency Test
Setup.
η =
VO. IO
VIN. IIN
x 100 %
Efficiency
Design Considerations
Input Filtering
The Austin MiniLynxTM 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 28 shows the input ripple
voltage (mVp-p) for various outputs with 1x22µF
(TDK: C3225X5R0J226V) ceramic capacitor at the
input of the module. Figure 29 shows the input ripple
with 1x47µF (TDK: C3225X5R0J476M) ceramic
capacitor at full load.
Input Ripple Voltage (mVp-p)
0
20
40
60
80
1
00
1
20
1
40
1
60
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 outputs
with 1x22 µF ceramic capacitor at the input (full-
load).
Input Ripple Voltage (mVp-p)
0
20
40
60
80
10 0
12 0
14 0
16 0
00.511.522.533.5
3.3Vin
5Vin
Output Voltage (Vdc)
Figure 29. Input ripple voltage for various outputs
with 1x47 µF ceramic capacitor at the input (full
load).
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 11
Design Considerations (continued)
Output Filtering
The Austin MiniLynxTM 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 6A in the
positive input lead.
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 12
Feature Description
Remote On/Off
The Austin MiniLynxTM SMT power modules feature
an On/Off pin for remote On/Off operation. Two
On/Off logic options are available in the Austin
MiniLynxTM series modules. Positive Logic On/Off
signal, device code suffix “4”, turns the module ON
during a logic High on the On/Off pin and turns the
module OFF during a logic Low. Negative logic
On/Off signal, no device code suffix, turns the module
OFF during logic High on the On/Off pin and turns the
module ON during logic Low.
For positive logic modules, the circuit configuration for
using the On/Off pin is shown in Figure 30. The
On/Off pin is an open collector/drain logic input signal
(Von/Off) that is referenced to ground. 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 30. Circuit configuration for using positive
logic On/OFF.
For negative logic On/Off devices, the circuit
configuration is shown is Figure 31. The On/Off pin is
pulled high with an external pull-up resistor (typical
Rpull-up = 5k, +/- 5%). When transistor Q1 is in the Off
state, logic High is applied to the On/Off pin and the
power module is Off. The minimum On/off voltage for
logic High on the On/Off pin is 1.5Vdc. To turn the
module ON, logic Low is applied to the On/Off pin by
turning ON Q1. When not using the negative logic
On/Off, leave the pin unconnected or tie to GND.
Q1
R1
R2
Q2 CSS
GND
PWM Enable
ON/OFF
VIN+
ON/OFF
_
+
V
I
MODULE
pull-up
R
ON/OFF
Figure 31. Circuit configuration for using
negative logic On/OFF.
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 2A.
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 over temperature protection in a fault
condition, the unit relies upon the thermal
protection feature of the controller IC. The unit will
shutdown if the thermal reference point Tref,
exceeds 140oC (typical), but the thermal shutdown
is not intended as a guarantee that the unit will
survive temperatures beyond its rating. The
module will automatically restart after it cools down.
Output Voltage Programming
The output voltage of the Austin MiniLynxTM 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 32) between the TRIM and GND pins of the
module. Without an external resistor between 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
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 13
Feature Descriptions (continued)
Output Voltage Programming (continued)
For example, to program the output voltage of the
Austin MiniLynxTM module to 1.8 Vdc, Rtrim is
calculated is follows:
−
−
=5110
7525.08.1
21070
Rtrim
Ω= kRtrim 004.15
V
O
(+)
TRIM
GND
Rtrim
LOAD
V
IN
(+)
ON/OFF
Figure 32. Circuit configuration to program
output voltage using an external resistor.
Table 1 provides Rtrim values required for some
common output voltages.
Table 1
VO, set (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
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.
Voltage Margining
Output voltage margining can be implemented in the
Austin MiniLynxTM 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 33 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 33. Circuit Configuration for margining
Output voltage.
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 14
Thermal Considerations
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 35. Note that the airflow is
parallel to the long axis of the module as shown in
figure 34. The derating data applies to airflow in
either direction of the module’s long axis.
Air Flow
Tre
f
Figure 34. Tref Temperature measurement
location.
The thermal reference point, Tref used in the
specifications is shown in Figure 34. For reliable
operation this temperature should not exceed 115oC.
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 35. Thermal Test Set-up.
A
ir
flow
x
Po w e r M o d u le
W
ind Tunne l
PWBs
5.97_
(0.235)
76.2_
(3.0)
Pro b e Lo c a t io n
for measuring
airflow and
ambient
temperature
25.4_
(1.0)
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A 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.)
Co-planarity (max): 0.102 [0.004]
BOTTOM VIEW SIDE VIEW
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A 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 Trim
5 VOUT
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 17
Packaging Details
The Austin MiniLynxTM 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
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 18
Surface Mount Information
Pick and Place
The Austin MiniLynxTM 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 placing. The label meets all the
requirements for surface mount processing, as well as
safety standards and is able to withstand maximum
reflow temperature. The label also carries product
information such as product code, serial number and
location of manufacture.
Figure 36. 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 8 mm max.
Tin Lead Soldering
The Austin MiniLynxTM SMT power modules are lead
free modules and can be soldered either in a lead-free
solder process or 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.
The Austin MiniLynxTM SMT power modules are lead
free modules and can be soldered either in a lead-free
solder process or 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.
REFLOW TEMP (°C)
0
50
10 0
15 0
200
250
300
Preheat zone
max 4oCs-1
Soak zone
30-240s
Heat zone
max 4oCs-1
Peak Temp 235oC
Co o ling
zo ne
1- 4 oCs-1
T
lim
above
205
o
C
REFLOW TIME (S)
Figure 37. Reflow Profile for Tin/Lead (Sn/Pb)
process.
MAX TEMP SOLDER (°C)
200
205
210
215
220
225
230
235
240
0 102030405060
Figure 38. Time Limit Curve Above 205oC Reflow
for Tin Lead (Sn/Pb) process.
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 19
Surface Mount Information (continued)
Lead Free Soldering
The –Z version Austin MiniLynx 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. 39.
MSL Rating
The Austin MiniLynxTM SMT modules have a MSL
rating of 2a.
Storage and Handling
The Austin MiniLynxTM modules have a MSL rating of
1. 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
1°C/Second
Peak Temp 260°C
* Min. Time Above 235°C
15 Seconds
*Time Above 217°C
60 Seconds
Cooling
Zone
Figure 39. Recommended linear reflow profile
using Sn/Ag/Cu solder.
Data Sheet
September 10, 2013
Austin MiniLynxTM SMT Non-isolated Power Modules:
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 3A output current
LINEAGE POWER 20
Document No: DS04-026 ver. 1.14
PDF name: minilynx_smt_ds.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@ 3A
On/Off
Logic
Connector
Type Comcodes
AXH003A0X-SR 2.4 – 5.5Vdc 0.75 – 3.63Vdc 3 A 94.0 % Negative SMT 108991196
AXH003A0X-SRZ 2.4 – 5.5Vdc 0.75 – 3.63Vdc 3 A 94.0 % Negative SMT CC109101301
AXH003A0X4-SR 2.4 – 5.5Vdc 0.75 – 3.63Vdc 3 A 94.0 % Positive SMT 108991205
AXH003A0X4-SRZ 2.4 – 5.5Vdc 0.75 – 3.63Vdc 3 A 94.0 % Positive SMT 109100014
-Z refers to RoHS-compliant codes
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 changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or
a
pplication. No rights under any pate nt accompany the sale of an y such product(s) or information.
Lineage Power DC-DC products are protected under various patents. Informa tion 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.
