Data Sheet
April 1, 2008
Austin MicrolynxTM 12V SIP Non-isolated Power Modules:
10Vdc – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A 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: DS03-101 ver. 1.31
PDF name: microlynx_12v_sip_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 5A output current
High efficiency – 89% at 3.3V full load (VIN = 12.0V)
Small size and low profile:
22.9 mm x 10.2 mm x 6.65 mm
(0.9 in x 0.4 in x 0.262 in)
Low output ripple and noise
High Reliability:
Calculated MTBF = 5.6M hours at 25oC Full-load
Output voltage programmable from 0.75 Vdc to
5.5Vdc 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 MicroLynxTM 12Vdc SIP (single in-line package) power modules are non-isolated dc-dc converters that can
deliver up to 5A of output current with full load efficiency of 89% 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 = 10 - 14V). Their open-frame construction and small footprint enable designers to develop cost- and
space-efficient solutions. Standard features include remote On/Off, programmable output voltage and overcurrent
protection.
RoHS Compliant
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A 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 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 All VIN 10 12 14 Vdc
Maximum Input Current All IIN,max 3.5 Adc
(VIN= VIN, min to VIN, max, IO=IO, max )
Input No Load Current VO,set = 0.75 Vdc IIN,No load 17 mA
(VIN = VIN, nom, Io = 0, module enabled) VO,set = 5.0Vdc IIN,No load 100 mA
Input Stand-by Current All IIN,stand-by 1.2 mA
(VIN = VIN, nom, 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
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A 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 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 ⎯ 15 30 mVrms
Peak-to-Peak (5Hz to 20MHz bandwidth) All ⎯ 30 75 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 5 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 85.0 %
V
O,set = 2.5Vdc η 87.0 %
V
O,set = 3.3Vdc η 89.0 %
V
O,set = 5.0Vdc η 92.0 %
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
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A 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 ⎯ 50 ⎯ 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 ⎯ 50 ⎯ μs
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C) All Vpk ⎯ 50 ⎯ 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 ⎯ 50 ⎯ μs
General Specifications
Parameter Min Typ Max Unit
Calculated MTBF (IO=IO, max, TA=25°C) 5,677,000 Hours
Weight ⎯ 2.8 (0.1) ⎯ g (oz.)
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A 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
Remote On/Off Signal interface
(VIN=VIN, min to VIN, max; Open collector pnp or equivalent
Compatible, Von/off signal referenced to GND
See feature description section)
Logic Low (On/Off Voltage pin open - Module ON)
Von/Off All VIL ― ― 0.4 V
Ion/Off All IIL ― ― 10 μA
Logic High (Von/Off > 2.5V – Module Off)
Von/Off All VIH ― ― V
IN, max V
Ion/off All IIH ― ― 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 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 = 10.0 to 14Vdc, TA = 25 oC
Overtemperature Protection All Tref ⎯ 140 ⎯ °C
(See Thermal Consideration section)
Input Undervoltage Lockout
Turn-on Threshold All 8.2 V
Turn-off Threshold All 8.0 V
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 6
Characteristic Curves
The following figures provide typical characteristics for the Austin MicroLynxTM 12V SIP modules at 25ºC.
70
72
74
76
78
80
82
84
86
0 12345
VIN= 14V
VIN = 12V
VIN = 10V
70
73
76
79
82
85
88
91
0 12345
VIN= 14V
VIN = 12V
VIN = 10V
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
012345
VIN= 14V
VIN = 12V
VIN = 10V
70
73
76
79
82
85
88
91
0 12345
VIN= 14V
VIN = 12V
VIN = 10V
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).
70
72
74
76
78
80
82
84
86
88
0 12345
VIN= 14V
VIN = 12V
VIN = 10V
75
78
81
84
87
90
93
96
012345
VIN= 14V
VIN = 12V
VIN = 10V
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
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 7
Characteristic Curves (continued)
The following figures provide typical characteristics for the MicroLynxTM 12V SIP modules at 25ºC.
0
0.5
1
1. 5
2
2.5
3
3.5
4
6 8 10 12 14
Io = 0A
Io = 5A
Io = 2.5A
INPUT CURRENT, IIN (A)
INPUT VOLTAGE, VIN
(
V
)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (100mV/div)
TIME
,
t
(
5
μ
s/div
)
Figure 7. Input voltage vs. Input Current
(Vout = 5.0Vdc).
Figure 10. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 3.3Vdc).
OUTPUT VOLTAGE
VO (V) (10mV/div)
TIME, t (2μs/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (100mV/div)
TIME, t (5 μs/div)
Figure 8. Typical Output Ripple and Noise
(Vin = 12V dc, Vo = 0.75 Vdc, Io=5A).
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)
TIME, t (2μs/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (2A/div) VO (V) (50mV/div)
TIME, t (10μs/div)
Figure 9. Typical Output Ripple and Noise
(Vin = 12.0V dc, Vo = 5.0 Vdc, Io=5A).
Figure 12. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 5.0 Vdc,
Cext = 2x150 μF Polymer Capacitors).
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 8
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin MicroLynxTM 12V SIP modules at 25ºC.
OUTPUT CURRENT OUTPUTVOLTAGE
IO (A) (2A/div) VO (V) (50mV/div)
TIME, t (10μs/div)
OUTPUT VOLTAGE, INPUT VOLTAGE
Vo (V) (2V/div) VIN (V) (5V/div)
TIME, t (1 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 with
(Vin = 12Vdc, Vo = 3.3Vdc, Io = 5A).
OUTPUT VOLTAGE On/Off VOLTAGE
VOV) (2V/div) VOn/off (V) (5V/div)
TIME, t (1 ms/div)
OUTPUT VOLTAGE On/Off VOLTAGE
VOV) (1V/div) VOn/off (V) (2V/div)
TIME, t (1 ms/div)
Figure 14. Typical Start-Up Using Remote On/Off
(Vin = 12Vdc, Vo = 3.3Vdc, Io = 5.0A).
Figure 17 Typical Start-Up using Remote On/off with
Prebias (Vin = 12Vdc, Vo = 1.8Vdc, Io = 1A, Vbias =1.0
Vdc).
OUTPUT VOLTAGE On/Off VOLTAGE
VOV) (1V/div) VOn/off (V) (2V/div)
TIME, t (1 ms/div)
OUTPUT CURRENT,
IO (A) (5A/div)
TIME, t (20ms/div)
Figure 15. Typical Start-Up Using Remote On/Off with
Low-ESR external capacitors (7x150uF Polymer)
(
Vin = 12Vdc
,
Vo = 3.3Vdc
,
Io = 5.0A
,
Co = 1050
μ
F
)
.
Figure 18. Output short circuit Current (Vin = 12Vdc,
Vo = 0.75Vdc).
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 9
Characteristic Curves (continued)
The following figures provide thermal derating curves for the Austin MicroLynxTM 12V SIP modules.
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
NC
0.5m/s (100 LFM )
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
NC
1.0m/s (200 LFM )
0.5m/s (100 LFM)
1.5m/s (300 LFM)
2.0m/s (400 LFM)
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 = 12Vdc,
Vo=0.75Vdc).
Figure 22. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 12Vdc,
Vo=5.0 Vdc).
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
NC
1.0m/s (200 LFM)
0.5m/s (100 LFM)
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, TA OC
Figure 20. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 12Vdc,
Vo=1.8 Vdc).
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
NC
1.0m/s (200 LFM)
0.5m/s (100 LFM)
OUTPUT CURRENT, Io (A)
AMBIENT TEMPERATURE, T
A
O
C
Figure 21. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 12Vdc,
Vo=3.3 Vdc).
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A 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 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
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 25. Output Voltage and Efficiency Test
Setup.
η =
VO. IO
VIN. IIN
x 100 %
Efficiency
Design Considerations
Input Filtering
The Austin MicroLynxTM 12V SIP 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 a typical application, 2x47 µF low-ESR tantalum
capacitors (AVX part #: TPSE476M025R0100, 47µF
25V 100 mΩ ESR tantalum capacitor) will be sufficient
to provide adequate ripple voltage at the input of the
module. To minimize ripple voltage at the input, low
ESR ceramic capacitors are recommended at the
input of the module. Figure 26 shows input ripple
voltage (mVp-p) for various outputs with 2x47 µF
tantalum capacitors and with 2x 22 µF ceramic
capacitor (TDK part #: C4532X5R1C226M) at full
load.
Input Ripple Voltage (mVp-p)
0
50
10 0
15 0
200
250
300
350
0 123456
Ceramic
Tant alum
Output Voltage (Vdc)
Figure 26. Input ripple voltage for various output
with 2x47 µF tantalum capacitors and with 2x22
µF ceramic capacitors at the input (100% of
Io,max).
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 11
Document No: DS03-101 ver. 1.31
PDF name: microlynx_12v_sip_ds.pdf
Design Considerations (continued)
Output Filtering
The Austin MicroLynxTM 12V SIP module is designed
for low output ripple voltage and will meet the
maximum output ripple specification with 1 µF
ceramic and 10 µF polymer 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
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 12
Feature Description
Remote On/Off
The Austin MicroLynxTM SIP 12V power modules
feature an On/Off pin for remote On/Off operation of
the module. If not using the remote On/Off pin, leave
the pin open (module will be On). The On/Off pin
signal (Von/Off) is referenced to ground. To switch
module on and off using remote On/Off, connect an
open collector pnp transistor between the On/Off pin
and the VIN pin (See Figure 27).
When the transistor Q1 is in the OFF state, the power
module is ON (Logic Low on the On/Off pin of the
module) and the maximum Von/off of the module is
0.4 V. The maximum allowable leakage current of the
transistor when Von/off = 0.4V and VIN = VIN,max is
10μA. During a logic-high when the transistor is in the
active state, the power module is OFF. During this
state VOn/Off =10 - 14V and the maximum IOn/Off =
1mA.
VIN(+)
GND
Enable
20k
20k
On/Off
Pin
Css
IOn/Off
Lynx-series Module
Figure 27. Remote On/Off Implementation
Remote On/Off can also be implemented using open-
collector logic devices with an external pull-up
resistor. Figure 27a shows the circuit configuration
using this approach. Pull-up resistor, Rpull-up, for the
configuration should be 68k (+/-5%) for proper
operation of the module over the entire temperature
range.
Q1
R1
R2
Q2 CSS
GND
PWM Enable
ON/OFF
VIN+
ON/OFF
_
+
V
I
MODULE
pull-up
R
ON/OFF
Figure 27a. Remote On/Off Implementation using
logic-level devices and an external pull-up
resistor
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 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
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 13
Document No: DS03-101 ver. 1.31
PDF name: microlynx_12v_sip_ds.pdf
Feature Descriptions (continued)
Output Voltage Programming
The output voltage of the Austin MicroLynxTM 12V SIP
can be programmed to any voltage from 0.75Vdc to
5.0Vdc by connecting a resistor (shown as Rtrim in
Figure 28) 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 MicroLynxTM 12V module to 1.8V, Rtrim is
calculated as follows:
⎥
⎦
⎤
⎢
⎣
⎡−
−
=1000
7525.08.1
10500
Rtrim
Ω= kRtrim 024.9
V
O
(+)
TRIM
GND
Rtrim
LOAD
V
IN
(+)
ON/OFF
Figure 28. Circuit configuration to program
output voltage using an external resistor
Austin MicroLynxTM 12Vdc can also be programmed
by applying a voltage between TRIM and GND pins
(Figure 29). The following equation can be used to
determine the value of Vtrim needed to obtain a
desired output voltage Vo:
{}()
7525.00667.07.0 −×−= VoVtrim
For example, to program the output voltage of a
MicroLynxTM module to 3.3 Vdc, Vtrim is calculated as
follows:
{}
)7525.03.30667.07.0( −×−=Vtrim
VVtrim 530.0=
VO(+)
TRIM
GND
V
trim
LOAD
VIN(+)
ON/OFF
+
-
Figure 29. Circuit Configuration for programming
Output voltage using external voltage source
Table 1 provides Rtrim values for most common
output voltages. Table 2 provides values of
external voltage source, Vtrim for various output
voltage.
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
Table 2
VO, set (V) Vtrim (V)
0.7525 Open
1.2 0.670
1.5 0.650
1.8 0.630
2.5 0.583
3.3 0.530
5.0 0.4166
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.
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 14
Feature Descriptions (continued)
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 MicroLynxTM modules by connecting a
resistor, Rmargin-up, from Trim pin to ground pin for
margining-up the output voltage and by connecting
a resistor, Rmargin-down, from Trim pin to Output pin.
Figure 30 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 30. Circuit Configuration for margining
Output voltage.
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 15
Document No: DS03-101 ver. 1.31
PDF name: microlynx_12v_sip_ds.pdf
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
Tref2
Top View
Bottom View
Tref1 (inductor winding)
Figure 31. Tref Temperature measurement
location.
The thermal reference point, Tref 1 used in the
specifications of thermal derating curves is shown in
Figure 31. For reliable operation this temperature
should not exceed 125oC.
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 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
1m/s (200 ft./min) are shown in the Characteristics
Curves section.
Layout Considerations
Copper paths must not be routed beneath the power
module. For additional layout guide-lines, refer to
FLTR100V10 application note.
A
ir
flow
x
Power Module
W
ind Tunnel
PWBs
7.24_
(0.285)
76.2_
(3.0)
Probe Location
for measuring
airflow and
ambient
temperature
25.4_
(1.0)
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 16
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.
Through-Hole Lead-Free Soldering
Information
The RoHS-compliant through-hole products use the
SAC (Sn/Ag/Cu) Pb-free solder and RoHS-compliant
components. They are designed to be processed
through single or dual wave soldering machines. The
pins have an RoHS-compliant finish that is compatible
with both Pb and Pb-free wave soldering processes.
A maximum preheat rate of 3°C/s is suggested. The
wave preheat process should be such that the
temperature of the power module board is kept below
210°C. For Pb solder, the recommended pot
temperature is 260°C, while the Pb-free solder pot is
270°C max. Not all RoHS-compliant through-hole
products can be processed with paste-through-hole
Pb or Pb-free reflow process. If additional information
is needed, please consult with your Lineage Power
technical representative for more details.
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 17
Document No: DS03-101 ver. 1.31
PDF name: microlynx_12v_sip_ds.pdf
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.)
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 18
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.)
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SIP Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
LINEAGE POWER 19
Document No: DS03-101 ver. 1.31
PDF name: microlynx_12v_sip_ds.pdf
Ordering Information
Please contact your Lineage Power Sales Representative for pricing, availability and optional features.
Table 3. Device Codes
Device Code
Input
Voltage Range
Output
Voltage
Output
Current
Efficiency
3.3V@ 5A
On/Off
Logic
Connector
Type Comcodes
AXA005A0XZ 10 – 14Vdc 0.75 – 5.5Vdc 5 A 89.0% Negative SIP CC109101284
AXA005A0X 10 – 14Vdc 0.75 – 5.5Vdc 5 A 89.0% Negative SIP 108981614
-Z refers to RoHS compliant Versions
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Lineage Power Corporation
3000 Skyline Drive, Mesquite, TX 75149, USA
+1-800-526-7819
(Outside U.S.A.: +1-972-284-2626)
www.lineagepower.com
e-mail: techsupport1@lineagepower.com
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Tel: +65 6416 4283
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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
application. No rights under any patent accompany the sale of any such product(s) or information.
© 2008 Lineage Power Corporation, (Mesquite, Texas) All International Rights Reserved.
