Data Sheet
April 1, 2008
Austin MicrolynxTM 12V SMT Non-isolated Power Modules:
10Vdc – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A Output Current
RoHS Compliant
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z
versions)
Compliant to ROHS EU Directive 2002/95/EC with
lead solder exemption (non-Z versions)
Delivers up to 5A output current
High efficiency – 89% at 3.3V full load (VIN = 12.0V)
Small size and low profile:
20.3 mm x 11.4 mm x 7.24 mm
(0.8 in x 0.45 in x 0.285 in)
Low output ripple and noise
High Reliability:
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
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
TM
Austin MicroLynx 12Vdc SMT (surface mount technology) 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 costand space-efficient solutions. Standard features include remote On/Off, programmable output voltage and
overcurrent protection.
* UL is a registered trademark of Underwriters Laboratories, Inc.
†
CSA is a registered trademark of Canadian Standards Association.
VDE is a trademark of Verband Deutscher Elektrotechniker e.V.
** ISO is a registered trademark of the International Organization of Standards
‡
Document No: DS03-100 ver. 1.51
PDF name: microlynx_smt_12v_ds.pdf
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are
absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in
excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for
extended periods can adversely affect the device reliability.
Parameter
Device
Symbol
Min
Max
Unit
All
VIN
-0.3
15
Vdc
All
TA
-40
85
°C
All
Tstg
-55
125
°C
Input Voltage
Continuous
Operating Ambient Temperature
(see Thermal Considerations section)
Storage Temperature
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
VO,set = 0.75 Vdc
IIN,No load
17
mA
VO,set = 5.0Vdc
IIN,No load
100
mA
All
IIN,stand-by
1.2
mA
Inrush Transient
All
It
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
Input Ripple Rejection (120Hz)
All
30
(VIN= VIN, min to VIN, max, IO=IO, max )
Input No Load Current
(VIN = VIN, nom, Io = 0, module enabled)
Input Stand-by Current
(VIN = VIN, nom, module disabled)
2
0.4
2
As
mAp-p
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 fastacting 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.
LINEAGE POWER
2
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Electrical Specifications (continued)
Parameter
Output Voltage Set-point
Device
Symbol
Min
Typ
Max
Unit
All
VO, set
-2.0
VO, set
+2.0
% VO, set
All
VO, set
-2.5%
⎯
+3.5%
% VO, set
All
VO
0.7525
5.5
Vdc
(VIN=IN, min, IO=IO, max, TA=25°C)
Output Voltage
(Over all operating input voltage, resistive load,
and temperature conditions until end of life)
Adjustment Range
Selected by an external resistor
Output Regulation
Line (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
RMS (5Hz to 20MHz bandwidth)
All
⎯
15
30
mVrms
Peak-to-Peak (5Hz to 20MHz bandwidth)
All
⎯
30
75
mVpk-pk
μF
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max
Cout = 1μF ceramic//10μFtantalum capacitors)
External Capacitance
ESR ≥ 1 mΩ
All
CO, max
⎯
⎯
1000
⎯
3000
μF
5
Adc
All
CO, max
⎯
Output Current
All
Io
0
Output Current Limit Inception (Hiccup Mode )
All
IO, lim
⎯
200
⎯
% Io
All
IO, s/c
⎯
2
⎯
Adc
VO, set = 1.2Vdc
η
81.5
%
VO,set = 1.5Vdc
η
84.0
%
ESR ≥ 10 mΩ
(VO= 90% of VO, set)
Output Short-Circuit Current
(VO≤250mV) ( Hiccup Mode )
Efficiency
VIN= VIN, nom, TA=25°C
IO=IO, max , VO= VO,set
Switching Frequency
VO,set = 1.8Vdc
η
85.0
%
VO,set = 2.5Vdc
η
87.0
%
VO,set = 3.3Vdc
η
89.0
%
VO,set = 5.0Vdc
η
92.0
%
All
fsw
⎯
300
⎯
kHz
All
Vpk
⎯
200
⎯
mV
Dynamic Load Response
(dIo/dt=2.5A/μs; VIN = VIN, nom; TA=25°C)
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
All
ts
⎯
25
⎯
μs
Load Change from Io= 100% to 50%of Io,max:
1μF ceramic// 10 μF tantalum
Peak Deviation
Settling Time (Vo<10% peak deviation)
LINEAGE POWER
3
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Electrical Specifications (continued)
Parameter
Device
Symbol
Min
Typ
Max
Unit
All
Vpk
⎯
50
⎯
mV
Dynamic Load Response
(dIo/dt=2.5A/μs; V VIN = VIN, nom; TA=25°C)
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)
Load Change from Io= 100% to 50%of Io,max:
Co = 2x150 μF polymer capacitors
Peak Deviation
All
Vpk
⎯
50
⎯
mV
Settling Time (Vo<10% peak deviation)
All
ts
⎯
50
⎯
μs
General Specifications
Parameter
Min
Calculated MTBF (IO=IO, max, TA=25°C)
Weight
LINEAGE POWER
Typ
Max
5,677,000
⎯
2.8 (0.1)
Unit
Hours
⎯
g (oz.)
4
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Data Sheet
April 1, 2008
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
Von/Off
All
VIL
Ion/Off
All
IIL
Von/Off
All
VIH
Ion/off
All
IIH
All
Min
Typ
Max
Unit
―
―
0.4
V
―
―
10
μA
―
―
VIN, max
V
―
―
1
mA
Tdelay
―
3
―
msec
All
Tdelay
―
3
―
msec
All
Trise
―
4
6
msec
―
1
% VO, set
140
⎯
°C
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)
Logic High (Von/Off > 2.5V – Module Off)
Turn-On Delay and Rise Times
o
(IO=IO, max , VIN = VIN, nom, TA = 25 C, )
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)
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)
Output voltage Rise time (time for Vo to rise from 10%
of Vo,set to 90% of Vo, set)
Output voltage overshoot – Startup
o
IO= IO, max; VIN = 10 to 14Vdc, TA = 25 C
Overtemperature Protection
All
Tref
⎯
(See Thermal Consideration section)
Input Undervoltage Lockout
Turn-on Threshold
All
8.2
V
Turn-off Threshold
All
8.0
V
LINEAGE POWER
5
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Data Sheet
April 1, 2008
Characteristic Curves
The following figures provide typical characteristics for the Austin MicroLynxTM 12V SMT modules at 25ºC.
86
91
84
88
EFFICIENCY, η (%)
EFFICIENCY, η (%)
82
80
78
76
VIN = 10V
74
VIN = 12V
72
VIN= 14V
70
0
1
2
3
4
85
82
79
VIN = 10V
76
VIN = 12V
73
VIN= 14V
70
0
5
1
OUTPUT CURRENT, IO (A)
2
3
4
5
OUTPUT CURRENT, IO (A)
Figure 1. Converter Efficiency versus Output Current
(Vout = 1.2Vdc).
Figure 4. Converter Efficiency versus Output Current
(Vout = 2.5Vdc).
88
91
86
88
EFFICIENCY, η (%)
EFFICIENCY, η (%)
84
82
80
78
76
VIN = 10V
74
VIN = 12V
72
VIN= 14V
70
85
82
79
VIN = 10V
76
VIN = 12V
73
VIN= 14V
70
0
1
2
3
4
5
0
1
OUTPUT CURRENT, IO (A)
3
4
5
OUTPUT CURRENT, IO (A)
Figure 2. Converter Efficiency versus Output Current
(Vout = 1.5Vdc).
Figure 5. Converter Efficiency versus Output Current
(Vout = 3.3Vdc).
96
88
86
93
EFFICIENCY, η (%)
84
EFFICIENCY, η (%)
2
82
80
78
76
VIN = 10V
74
VIN = 12V
72
VIN= 14V
1
2
3
4
5
OUTPUT CURRENT, IO (A)
Figure 3. Converter Efficiency versus Output Current
(Vout = 1.8Vdc).
LINEAGE POWER
87
84
VIN = 10V
81
VIN = 12V
78
VIN= 14V
75
70
0
90
0
1
2
3
4
5
OUTPUT CURRENT, IO (A)
Figure 6. Converter Efficiency versus Output Current
(Vout = 5.0Vdc).
6
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Data Sheet
April 1, 2008
Characteristic Curves (continued)
0.5
0
6
8
10
12
INPUT VOLTAGE, VIN (V)
VO (V) (10mV/div)
OUTPUT VOLTAGE
Figure 7. Input voltage vs. Input Current
(Vout = 5.0Vdc).
TIME, t (2μs/div)
VO (V) (10mV/div)
OUTPUT VOLTAGE
Figure 8. Typical Output Ripple and Noise
(Vin = 12V dc, Vo = 0.75 Vdc, Io=5A).
TIME, t (2μs/div)
Figure 9. Typical Output Ripple and Noise
(Vin = 12.0V dc, Vo = 5.0 Vdc, Io=5A).
LINEAGE POWER
14
VO (V) (100mV/div)
IO (A) (2A/div)
1
TIME, t (5 μs/div)
Figure 10. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 3.3Vdc).
VO (V) (100mV/div)
1.5
IO (A) (2A/div)
2
OUTPUT CURRENT, OUTPUT VOLTAGE
Io = 5A
TIME, t (5 μs/div)
Figure 11. Transient Response to Dynamic Load
Change from 100% to 50% of full load (Vo = 3.3 Vdc).
VO (V) (50mV/div)
INPUT CURRENT, IIN (A)
3
2.5
IO (A) (2A/div)
Io = 0A
Io = 2.5A
OUTPUT CURRENT, OUTPUT VOLTAGE
4
3.5
OUTPUT CURRENT, OUTPUT VOLTAGE
The following figures provide typical characteristics for the MicroLynxTM 12V SMT modules at 25ºC.
TIME, t (10μs/div)
Figure 12. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 5.0 Vdc,
Cext = 2x150 μF Polymer Capacitors).
7
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Characteristic Curves (continued)
VOn/off (V) (2V/div)
VOV) (1V/div)
OUTPUT VOLTAGE,
Vo (V) (2V/div)
INPUT VOLTAGE
VIN (V) (5V/div)
TIME, t (2 ms/div)
Figure 15. Typical Start-Up Using Remote On/Off with
Low-ESR external capacitors (7x150uF Polymer)
VOn/off (V) (2V/div)
TIME, t (1 ms/div)
Figure 17 Typical Start-Up using Remote On/off with
Prebias (Vin = 12Vdc, Vo = 1.8Vdc, Io = 1A, Vbias =1.0
Vdc).
OUTPUT CURRENT,
On/Off VOLTAGE
OUTPUT VOLTAGE
Figure 14. Typical Start-Up Using Remote On/Off
(Vin = 12Vdc, Vo = 3.3Vdc, Io = 5.0A).
On/Off VOLTAGE
VOn/off (V) (5V/div)
VOV) (2V/div)
TIME, t (1 ms/div)
TIME, t (1 ms/div)
Figure 16. Typical Start-Up with application of Vin with
(Vin = 12Vdc, Vo = 3.3Vdc, Io = 5A).
VOV) (1V/div)
On/Off VOLTAGE
OUTPUT VOLTAGE
Figure 13. Transient Response to Dynamic Load
Change from 100% of 50% full load (Vo = 5.0 Vdc, Cext
= 2x150 μF Polymer Capacitors).
OUTPUT VOLTAGE
TIME, t (10μs/div)
IO (A) (5A/div)
OUTPUT CURRENT OUTPUTVOLTAGE
IO (A) (2A/div)
VO (V) (50mV/div)
The following figures provide typical characteristics for the Austin MicroLynxTM 12V SMT modules at 25ºC.
TIME, t (20ms/div)
Figure 18. Output short circuit Current (Vin = 12Vdc,
Vo = 0.75Vdc).
(Vin = 12Vdc, Vo = 3.3Vdc, Io = 5.0A, Co = 1050μF).
LINEAGE POWER
8
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Data Sheet
April 1, 2008
Characteristic Curves (continued)
6
6
5
5
4
3
NC
2
0.5m/s (100 LFM )
1
0
20
30
40
50
60
70
80
90
O
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
The following figures provide thermal derating curves for the Austin MicroLynxTM 12V SMT modules.
NC
4
0.5m/s (100 LFM )
3
1.0m/s (200 LFM )
2
1.5m/s (300 LFM )
1
2.0m/s (400 LFM )
0
20
30
40
50
60
70
80
90
O
AMBIENT TEMPERATURE, TA C
AMBIENT TEMPERATURE, TA C
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).
OUTPUT CURRENT, Io (A)
6
5
4
3
NC
2
0.5m/s (100 LFM )
1
1.0m/s (200 LFM )
0
20
30
40
50
60
70
80
90
O
AMBIENT TEMPERATURE, TA C
Figure 20. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 12Vdc,
Vo=1.8 Vdc).
OUTPUT CURRENT, Io (A)
6
5
4
3
NC
2
0.5m/s (100 LFM )
1
1.0m/s (200 LFM )
0
20
30
40
50
60
70
80
90
O
AMBIENT TEMPERATURE, TA C
Figure 21. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 12Vdc,
Vo=3.3 Vdc).
LINEAGE POWER
9
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Data Sheet
April 1, 2008
Test Configurations
Design Considerations
CURRENT PROBE
VIN(+)
BATTERY
CIN
CS 1000μF
Electrolytic
2x100μF
Tantalum
E.S.R.<0.1Ω
@ 20°C 100kHz
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.
Figure 23. Input Reflected Ripple Current Test Setup.
COPPER STRIP
VO (+)
RESISTIVE
LOAD
1uF
.
10uF
GROUND PLANE
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 24. Output Ripple and Noise Test Setup.
Rcontact
Rcontact
VIN(+)
Rdistribution
RLOAD
VO
Rcontact
Rcontact
COM
Rdistribution
VO
VIN
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 (mVpp) for various outputs with 2x47 µF tantalum capacitors
and with 2x 22 µF ceramic capacitor (TDK part #:
C4532X5R1C226M) at full load.
350
SCOPE
COM
Rdistribution
TM
The Austin MicroLynx 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.
LTEST
1μH
Input Filtering
Input Ripple Voltage (mVp-p)
TO OSCILLOSCOPE
300
250
200
150
100
Tantalum
50
Ceramic
0
0
1
2
3
4
5
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 (80% of Io,max).
Rdistribution
COM
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.
VO. IO
Efficiency
η =
LINEAGE POWER
VIN. IIN
x
100 %
10
6
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Design Considerations (continued)
Output Filtering
The Austin MicroLynxTM 12V 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.
LINEAGE POWER
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 fastacting fuse with a maximum rating of 6A in the positive
input lead.
11
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Data Sheet
April 1, 2008
Feature Description
Remote On/Off
TM
The Austin MicroLynx SMT 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(+)
Lynx-series Module
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.
IOn/Off
On/Off
Pin
Enable
20k
Css
GND
20k
Figure 27. Remote On/Off Implementation
Remote On/Off can also be implemented using opencollector logic devices with an external pull-up resistor.
Figure 28a 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.
VIN+
MODULE
Rpull-up
I ON/OFF
ON/OFF
+
VON/OFF
PWM Enable
R1
Q2
Q1
CSS
R2
GND
_
Feature Descriptions (continued)
Figure 27a. Remote On/Off Implementation using
logic-level devices and an external pull-up resistor
Output Voltage Programming
Overcurrent Protection
The output voltage of the Austin MicroLynx 12V can be
programmed to any voltage from 0.75Vdc to 5.5Vdc by
LINEAGE POWER
TM
12
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Data Sheet
April 1, 2008
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:
V IN(+)
V O(+)
ON/OFF
LOAD
TRIM
⎡ 10500
⎤
Rtrim = ⎢
− 1000⎥ Ω
⎣Vo − 0.7525
⎦
+
-
GND
Rtrim is the external resistor in Ω
Vtrim
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:
⎤
⎡ 10500
− 1000⎥
1
.
8
−
0
.
7525
⎣
⎦
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
Rtrim = ⎢
Rtrim = 9.024 kΩ
V IN(+)
V O(+)
VO, set (V)
ON/OFF
LOAD
TRIM
R trim
GND
Figure 28. Circuit configuration to program output
voltage using an external resistor
TM
Austin MicroLynx 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:
Vtrim = (0.7 − 0.0667 × {Vo − 0.7525})
For example, to program the output voltage of a
TM
MicroLynx module to 3.3 Vdc, Vtrim is calculated as
follows:
Vtrim = (0.7 − 0.0667 × {3.3 − 0.7525})
Vtrim = 0.530V
LINEAGE POWER
Figure 29. Circuit Configuration for programming
Output voltage using external voltage source
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.
13
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Data Sheet
April 1, 2008
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, Rmargindown, 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
Rmargin-down
Austin Lynx or
Lynx II Series
Q2
Trim
Rmargin-up
Rtrim
Q1
GND
Figure 30. Circuit Configuration for margining
Output voltage.
LINEAGE POWER
14
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Data Sheet
April 1, 2008
Thermal Considerations
Power modules operate in a variety of thermal
environments; however, sufficient cooling should be
provided to help ensure reliable operation.
25.4_
(1.0)
Wind Tunnel
PWBs
Power Module
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.
76.2_
(3.0)
x
Air Flow
7.24_
(0.285)
Tref1 (inductor winding)
Probe Location
for measuring
airflow and
ambient
temperature
Air
flow
Figure 32. Thermal Test Set-up.
Heat Transfer via Convection
Top View
Tref2
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.
Bottom View
Figure 31. Tref Temperature measurement location.
The thermal reference points, Tref 1 and Tref2 used in the
specifications of thermal derating curves are shown in
Figure 31. For reliable operation these temperatures
o
should not exceed 125 C.
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 BoardMounted Power Modules” for a detailed discussion of
thermal aspects including maximum device temperatures.
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Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
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]
PIN
FUNCTION
1
On/Off
2
VIN
3
GND
4
Trim
5
VOUT
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Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
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
LINEAGE POWER
17
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Packaging Details
The Austin MicroLynxTM 12V SMT versions are 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 Dimensions:
Inside Dimensions:
Width
LINEAGE POWER
330.2 mm (13.00)
177.8 mm (7.00”)
44.0 mm (1.73”)
18
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Data Sheet
April 1, 2008
Surface Mount Information
Pick and Place
TM
The Austin MicroLynx 12V 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.
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.
300
P eak Temp 235oC
REFLOW TEMP (°C)
250
Figure 33. Pick and Place Location.
Tin Lead Soldering
The Austin MicroLynxTM 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.
So ak zo ne
30-240s
100
Tlim above
205oC
P reheat zo ne
max 4oCs -1
0
REFLOW TIME (S)
Figure 34. Reflow Profile for Tin/Lead (Sn/Pb)
process.
240
235
MAX TEMP SOLDER (°C)
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.
150
50
Nozzle Recommendations
Co o ling
zo ne
1-4oCs -1
Heat zo ne
max 4oCs -1
200
230
225
220
215
210
205
200
0
10
20
30
40
50
60
o
Figure 35. Time Limit Curve Above 205 C for
Tin/Lead (Sn/Pb) process.
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,
LINEAGE POWER
19
Data Sheet
April 1, 2008
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Surface Mount Information (continued)
Modules: Soldering and Cleaning Application Note
(AN04-001).
300
Lead Free Soldering
Peak Temp 260°C
Reflow Temp (°C)
The –Z version Austin MicroLynx 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.
Per J-STD-020 Rev. C
250
200
150
* Min. Time Above 235°C
15 Seconds
Heating Zone
1°C/Second
Cooling
Zone
*Time Above 217°C
60 Seconds
100
50
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 Fig. 36.
0
Reflow Time (Seconds)
Figure 36. Recommended linear reflow profile
using Sn/Ag/Cu solder.
MSL Rating
The Austin MicroLynx 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 Board Mounted Power
LINEAGE POWER
20
Austin MicroLynxTM 12V SMT Non-isolated Power Modules:
10 – 14Vdc input; 0.75Vdc to 5.5Vdc Output; 5A output current
Data Sheet
April 1, 2008
Ordering Information
Please contact your Lineage Power representative for pricing, availability and optional features.
Table 3. Device Codes
Device Code
Input
Voltage
Range
Output
Voltage
Output
Current
Efficiency
3.3V@ 6A
On/Off
Logic
Connector
Type
Comcodes
AXA005A0X-SR
10 – 14Vdc
0.75 – 5.5Vdc
5A
89.0%
Negative
SMT
108981622
AXA005A0X-SRZ
10 – 14Vdc
0.75 – 5.5Vdc
5A
89.0%
Negative
SMT
108995172
-Z refers to RoHS compliant versions
Asia-Pacific Headquarters
Tel: +65 6416 4283
World Wide Headquarters
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: [email protected]
Europe, Middle-East and Africa Headquarters
Tel: +49 89 6089 286
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
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.
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Document No: DS03-100 ver. 1.51
PDF name: microlynx_smt_12v_ds.pdf