Data Sheet
August 1, 2006
Austin MinilynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5 Vdc 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: DS04-027 ver. 0.5
PDF name: minilynx_12v_smt_ds.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 3A output current
High efficiency – 91% at 3.3V full load (VIN = 12.0V)
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
Constant switching frequency (300 kHz)
Output voltage programmable from 0.75 Vdc to 5.5
Vdc via external resistor
Line Regulation: 0.3% (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
Description
Austin MiniLynxTM 12V 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 91% at 3.3V output. These modules provide precisely
regulated output voltage programmable via external resistor from 0.75Vdc to 5.5Vdc over a wide range of input
voltage (VIN = 8.3 - 14V). Their open-frame construction and small footprint enable designers to develop cost- and
space-efficient solutions. In addition to sequencing, standard features include remote On/Off, programmable output
voltage and over current protection.
RoHS Compliant
Data Sheet
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 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 15 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 ≤ 3.63 VIN 8.3 12 14 Vdc
Vo,set > 3.63 VIN 8.3 12 13.2 Vdc
Maximum Input Current All IIN,max 2.2 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 45 mA
(VIN = VIN, nom Vdc, IO = 0, module enabled) VO,set = 5.5Vdc IIN,No load 150 mA
Input Stand-by Current All IIN,stand-by 1.2 mA
(VIN = 5.5Vdc, module disabled)
Inrush Transient All I2t 0.4 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 30 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
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 3
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point All VO, set -2.5 VO, set +2.5 % VO, set
(VIN=IN, min, IO=IO, max, TA=25°C)
Output Voltage All VO, set -3% +4% % VO, set
(Over all operating input voltage, resistive load,
and temperature conditions until end of life)
Adjustment Range All VO 0.7525 5.5 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 10 15 mVrms
Peak-to-Peak (5Hz to 20MHz bandwidth) All 30 50 mVpk-pk
External Capacitance
ESR ≥ 1 mΩ All CO, max 1000 µF
ESR ≥ 10 mΩ All CO, max 3000 µF
Output Current All Io 0 3 Adc
Output Current Limit Inception (Hiccup Mode ) All IO, lim 200 % Io
(VO= 90% of VO, set)
Output Short-Circuit Current All IO, s/c 2 Adc
(VO≤250mV) ( Hiccup Mode )
Efficiency VO,set = 1.2Vdc η 81.5 %
VIN= VIN, nom, TA=25°C VO, set = 1.5Vdc η 84.0 %
IO=IO, max , VO= VO,set V
O,set = 1.8Vdc η 86.0 %
V
O,set = 2.5Vdc η 89.0 %
V
O,set = 3.3Vdc η 91.0 %
V
O,set = 5.0Vdc η 93.0 %
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
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 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 75 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 75 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 (VIN= VIN, nom, IO= 0.8IO, max, TA=40°C) Telecordia
SR 332 Issue 1: Method 1, case 3 10,865,800 Hours
Weight 2.8 (0.1) g (oz.)
Data Sheet
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 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 2.5 ― 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 ― 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 ― msec
Output voltage Rise time (time for Vo to rise from 10%
of Vo,set to 90% of Vo, set)
All Trise ― 4 6 msec
Output voltage overshoot – Startup ― 1 % VO, set
IO= IO, max; VIN = 8.3 to 14Vdc, TA = 25 oC
Overtemperature Protection All Tref 140 °C
(See Thermal Consideration section)
Input Undervoltage Lockout
Turn-on Threshold All 7.9 V
Turn-off Threshold All 7.8 V
Data Sheet
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 6
Characteristic Curves
The following figures provide typical characteristics for the Austin MiniLynxTM 12 V SMT modules at 25ºC.
70
72
74
76
78
80
82
84
86
88
00.61.21.82.4 3
VIN =14.0V
VIN = 12.0V
VIN = 8.3V
74
76
78
80
82
84
86
88
90
92
00.61.21.82.4 3
VIN = 14.0V
VIN =12.0V
VIN = 8.3V
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
Figure 1. Converter Efficiency versus Output Current
(Vout = 1.2Vdc).
Figure 4. Converter Efficiency versus Output Current
(Vout = 2.5Vdc).
70
72
74
76
78
80
82
84
86
88
0 0 .6 1.2 1.8 2 .4 3
VIN = 14.0V
VIN = 12.0V
VIN = 8.3V
71
74
77
80
83
86
89
92
95
0 0.6 1.2 1.8 2.4 3
VIN = 14.0V
VIN = 12.0V
VIN = 8.3V
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
Figure 2. Converter Efficiency versus Output Current
(Vout = 1.5Vdc).
Figure 5. Converter Efficiency versus Output Current
(Vout = 3.3Vdc).
72
74
76
78
80
82
84
86
88
90
0 0.6 1.2 1.8 2.4 3
VIN = 14.0V
VIN = 12.0V
VIN = 8.3V
72
75
78
81
84
87
90
93
96
99
0 0.6 1.2 1.8 2 .4 3
VIN =14.0V
VIN = 12.0V
VIN = 8.3V
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
EFFICIENCY, η (%)
OUTPUT CURRENT, IO (A)
Figure 3. Converter Efficiency versus Output Current
(Vout = 1.8Vdc).
Figure 6. Converter Efficiency versus Output Current
(Vout = 5.0Vdc).
Data Sheet
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 7
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin MiniLynxTM 12V SMT modules at 25ºC.
0
0.2
0.4
0.6
0.8
1
1. 2
1. 4
1. 6
7 8 91011121314
Io=1.5A
Io=0A
Io=3A
INPUT CURRENT, I
IN
(A)
INPUT VOLTAGE, VIN
(
V
)
OUTPUT CURRENT, OUTPUT VOLTAGE
I
O
(A) (1A/div) V
O
(V) (200mV/div)
TIME
,
t
(
5
µ
s/div
)
Figure 7. Input voltage vs. Input Current
(Vout =3.3Vdc).
Figure 10. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 3.3Vdc).
OUTPUT VOLTAGE
V
O
(V) (10mV/div)
TIME, t (1µs/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
I
O
(A) (1A/div) V
O
(V) (200mV/div)
TIME, t (5 µs/div)
Figure 8. Typical Output Ripple and Noise
(VIN = 12.0V 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
V
O
(V) (10mV/div)
TIME, t (1µs/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
I
O
(A) (2A/div) V
O
(V) (50mV/div)
TIME, t (50µs/div)
Figure 9. Typical Output Ripple and Noise
(VIN = 12.0V 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
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 8
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin MiniLynxTM 12 V SMT modules at 25ºC.
OUTPUT CURRENT, OUTPUTVOLTAGE
I
O
(A) (1A/div) V
O
(V) (50mV/div)
TIME, t (100µs/div)
INPUT VOLTAGE OUTPUT VOLTAGE
V
IN
(V) (10V/div) V
O
(V) (1V/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 = 12.0Vdc, Vo = 3.3Vdc, Io = 3A).
ON/OFF VOLTAGE OUTPUT VOLTAGE
V
On/off
(V) (10V/div) V
O
(V) (1V/div)
TIME, t (2ms/div)
ON/OFF VOLTAGE OUTPUT VOLTAGE
V
On/off
(V) (10V/div) V
O
(V) (0.5V/div)
TIME, t (2ms/div)
Figure 14. Typical Start-Up Using Remote On/Off
(VIN = 12.0Vdc, Vo = 3.3Vdc, Io = 3A).
Figure 17 Typical Start-Up Using Remote On/Off
with Prebias (VIN = 12.0Vdc, Vo = 1.8Vdc, Io = 1.0A,
Vbias =1.0Vdc).
ON/OFF VOLTAGE OUTPUT VOLTAGE
V
On/off
(V) (10V/div) V
O
(V) (1V/div)
TIME, t (2ms/div)
OUTPUT CURRENT,
I
O
(A) (5A/div)
TIME, t (10ms/div)
Figure 15. Typical Start-Up Using Remote On/Off with
Low-ESR external capacitors (7x150uF Polymer)
(
VIN = 12.0Vdc
,
Vo = 3.3Vdc
,
Io = 3A
,
Co = 1050
µ
µµ
µ
F
)
.
Figure 18. Output short circuit Current
(VIN = 12.0Vdc, Vo = 0.75Vdc).
Data Sheet
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 9
Characteristic Curves (continued)
The following figures provide thermal derating curves for the Austin MiniLynxTM 12 V SMT modules.
0
0.5
1
1. 5
2
2.5
3
3.5
20 30 40 50 60 70 80 90
0 LFM
10 0 L F M
0.0
0.5
1. 0
1. 5
2.0
2.5
3.0
3.5
20 30 40 50 60 70 80 90
0 LFM
10 0 LF M
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, TA OC
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, TA OC
Figure 19. Derating Output Current versus Local
Ambient Temperature and Airflow (VIN = 12.0 Vdc,
Vo=0.75Vdc).
Figure 22. Derating Output Current versus Local
Ambient Temperature and Airflow (VIN = 12 Vdc,
Vo=5.0 Vdc).
0.0
0.5
1. 0
1. 5
2.0
2.5
3.0
3.5
20 30 40 50 60 70 80 90
0 LFM
10 0 L F M
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, TA OC
Figure 20. Derating Output Current versus Local
Ambient Temperature and Airflow (VIN = 12.0Vdc,
Vo=1.8 Vdc).
0.0
0.5
1. 0
1. 5
2.0
2.5
3.0
3.5
20 30 40 50 60 70 80 90
0 LFM
100 LFM
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, TA
O
C
Figure 21. Derating Output Current versus Local
Ambient Temperature and Airflow (VIN = 12.0Vdc,
Vo=3.3 Vdc).
Data Sheet
August 1, 2006
A
ustin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 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 23. 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 24. Output Ripple and Noise Test Setup.
VO
COM
VIN(+)
COM
RLOAD
Rcontact Rdistribution
Rcontact 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 25. Output Voltage and Efficiency Test Setup.
η
=
VO. IO
VIN. IIN
x 100 %
Efficiency
Design Considerations
Input Filtering
Austin MiniLynxTM 12V 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 in the presence of
inductive traces that supply input voltage to the module.
In a typical application, 2x47 µF low-ESR ceramic
capacitors (TDK part #: C4532X5R1C476M) will be
sufficient to provide adequate ripple voltage at the input
of the module. To further minimize ripple voltage at the
input, additional ceramic capacitors are recommended
at the input of the module. Figure 26 shows input ripple
voltage (mVp-p) for various outputs with 2x47µF and
with 4x47 µF ceramic capacitor (TDK part #:
C4532X5R1C226M) at full load.
Input Ripple Voltage (mVp-p)
TBD
Output Voltage (Vdc)
Figure 26. Input ripple voltage for various outputs
with 1x22 µF ceramic capacitor at the input (full-
load).
Data Sheet
August 1, 2006
A
ustin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 11
Design Considerations (continued)
Output Filtering
The Austin MiniLynxTM 12 V 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. To perform specific
stability and transient response analysis, use Tyco
Power’s Stability Analysis Tool (SAT) available at
power.tycoelectronics.com. Please contact your local
Tyco Power application engineer for availability of
characteristic model of these Austin Lynx modules.
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
August 1, 2006
A
ustin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 12
Feature Description
Remote On/Off
Austin MiniLynxTM 12V SMT power modules feature an
On/Off pin for remote On/Off operation. Two On/Off
logic options are available in the Austin MiniLynxTM 12V
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 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 27. 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 27. Circuit configuration for using positive
logic On/OFF.
For negative logic On/Off devices, the circuit
configuration is shown is Figure 28. The On/Off pin is
pulled high with an external pull-up resistor (typical Rpull-
up = 68k, +/- 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 2.5 Vdc. 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 28. 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 3.5A.
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 Tref2, (see Figure 31) 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 restarts after it cools down.
Data Sheet
August 1, 2006
A
ustin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 13
Feature Descriptions (continued)
Output Voltage Programming
The output voltage of the Austin MiniLynxTM 12V can be
programmed to any voltage from 0.75Vdc to 5.5Vdc by
connecting a resistor (shown as Rtrim in Figure 29)
between Trim and GND pins of the module. Without an
external resistor between Trim and GND pins, the
output of the module will be 0.7525Vdc. To calculate
the value of the trim resistor, Rtrim for a desired output
voltage, use the following equation:
Ω
−
−
=1000
7525.0
10500
Vo
Rtrim
Rtrim is the external resistor in Ω
Vo is the desired output voltage
For example, to program the output voltage of the
Austin MiniLynxTM 12V module to 1.8V, Rtrim is
calculated as follows:
−
−
=1000
7525.08.1
10500
Rtrim
Ω= kRtrim 024.9
V
O
(+)
TRIM
GND
R
trim
LOAD
V
IN
(+)
ON/OFF
Figure 29. 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 22.46
1.5 13.05
1.8 9.024
2.5 5.009
3.3 3.122
5.0 1.472
Using 1% tolerance trim resistor, set point tolerance of
±2% is achieved as specified in the electrical
specification. The Lynx Programming Tool, available at
power.tycoelectronics.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 30 shows the circuit
configuration for output voltage margining. The Lynx
Programming Tool, available at
power.tycoelectronics.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 Tyco Field Application
Engineer or Account Manager for additional details.
Vo
Austin Lynx or
Lynx II Series
GND
Trim
Q1
Rtrim
Rmargin-up
Q2
Rmargin-down
Figure 30. Circuit Configuration for margining
Output voltage.
Data Sheet
August 1, 2006
A
ustin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 14
Thermal Considerations
Power modules operate in a variety of thermal
environments; however, sufficient cooling should 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 32. Note that the airflow is parallel to
the long axis of the module as shown in figure 31. The
derating data applies to airflow in either direction of the
module’s long axis.
Air Flow
Tref
Figure 31. Tref Temperature measurement location.
The thermal reference point, Tref used in the
specifications is shown in Figure 32. 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).
Figure 32. 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 by various module versus local ambient
temperature (TA) for natural convection and up to
0.5m/s (100 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
5.97_
(0.235)
76.2_
(3.0)
Probe Location
for measuring
airflow and
ambient
temperature
25.4_
(1.0)
Data Sheet
August 1, 2006
A
ustin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 15
Mechanical Outline
Dimensions are in inches and (millimeters).
Tolerances: x.xx in. ± 0.02 in. (x.x mm ± 0.5 mm) [unless otherwise indicated]
x.xxx in ± 0.010 in. (x.xx mm ± 0.25 mm)
Bottom View
Co-planarity (max): 0.102 [0.004]
Side View
PIN FUNCTION
1 On/Off
2 VIN
3 GND
4 Trim
5 VOUT
Data Sheet
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 16
Recommended Pad Layout
Dimensions are in inches and (millimeters).
Tolerances: x.xx in. ± 0.02 in. (x.x mm ± 0.5 mm) [unless otherwise indicated]
x.xxx in ± 0.010 in. (x.xx mm ± 0.25 mm)
PIN FUNCTION
1 On/Off
2 VIN
3 GND
4 Trim
5 VOUT
Data Sheet
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 17
Packaging Details
The Austin MiniLynxTM 12 V 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
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 18
Surface Mount Information
Pick and Place
The Austin MiniLynxTM 12 V 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 33. 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 12V 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
So ak zone
30-240s
Heat zone
max 4
o
Cs
-1
Peak Temp 235
o
C
Cooling
zo ne
1- 4
o
Cs
-1
T
lim
above
205
o
C
REFLOW TIME (S)
Figure 34. Reflow Profile for Tin/Lead (Sn/Pb)
process.
MAX TEMP SOLDER (°C)
200
205
210
215
220
225
230
235
240
0 102030405060
Figure 35. Time Limit Curve Above 205oC Reflow
for Tin Lead (Sn/Pb) process.
Data Sheet
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
Tyco Electronics Power Systems 19
Surface Mount Information (continued)
Lead Free Soldering
The –Z version Austin MiniLynx 12V 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. 36.
MSL Rating
The Austin MiniLynx 12V SMT modules have a MSL
rating of 2.
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 Tyco Electronics Board
Mounted Power Modules: Soldering and Cleaning
Application Note (AN04-001).
Per J-STD-020 Re v. 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 Se conds
Cooling
Zone
Figure 36. Recommended linear reflow profile
using Sn/Ag/Cu solder.
Data Sheet
August 1, 2006
Austin MiniLynxTM 12V SMT Non-isolated Power Modules:
8.3 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 3A output current
World Wide Headquarters
Tyco Electronics Power Systems, Inc.
3000 Skyline Drive, Mesquite, TX 75149, USA
+1-800-526-7819
(Outside U.S.A.: +1-972-284-2626)
www.power.tycoelectronics.com
e-mail: techsupport1@tycoelectronics.com
Europe, Middle-East and Africa Headquarters
Tyco Electronics (UK) Ltd
Tel: +44 (0) 1344 469 300
Latin America, Brazil, Caribbean Headquarters
Tyco Electronics Power Systems
Tel: +56 2 209 8211
India Headquarters
Tyco Electronics Systems India Pte. Ltd.
Tel: +91 80 841 1633 x3001
Asia-Pacific Headquarters
Tyco Electronics Singapore Pte. Ltd.
Tel: +65 6416 4283
Tyco Electronics Corporation 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 application. No rights under any patent accompany the sale of any such
product(s) or information.
© 2003 Tyco Electronics Power Systems, Inc., (Mesquite, Texas) All International Rights Reserved.
Document No: DS04-027 ver. 0.5
PDF name: minilynx_12v_smt_ds.pdf
Ordering Information
Please contact your Tyco Electronics’ Sales Representative for pricing, availability and optional features.
Table 3. Device Codes
Device Code Input
Voltage
Output
Voltage
Output
Current
Efficiency
3.3V@ 3A
On/Off
Logic
Connector
Type Comcodes
AXA003A0X-SR 8.3 – 14Vdc 0.75 – 5.5Vdc 3 A 89.0 % Negative SMT 108991213
AXA003A0X4-SR 8.3 – 14Vdc 0.75 – 5.5Vdc 3 A 89.0 % Positive SMT 108991221
AXA003A0X-SRZ 8.3 – 14Vdc 0.75 – 5.5Vdc 3 A 89.0 % Negative SMT
CC109101276
AXA003A0X4-SRZ 8.3 – 14Vdc 0.75 – 5.5Vdc 3 A 89.0 % Positive SMT
CC109102266
-Z refers to RoHS compliant Versions
