Data Sheet
June 24, 2008
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0Vdc – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A Output Current
RoHS Compliant
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 – 94% at 3.3V full load (VIN = 5.0V)
Small size and low profile:
20.3 mm x 11.4 mm x 5.97 mm
(0.80 in x 0.45 in x 0.235 in)
Low output ripple and noise
High Reliability:
Calculated MTBF = 19M hours at 25oC Full-load
Distributed power architectures
Constant switching frequency (300 kHz)
Intermediate bus voltage applications
Telecommunications equipment
Output voltage programmable from 0.75 Vdc to
4.0Vdc via external resistor
Servers and storage applications
Line Regulation: 0.3% (typical)
Networking equipment
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
The Austin MicroLynxTM 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 94.0% at 3.3V output. These modules provide a
precisely regulated output voltage programmable via an external resistor from 0.75Vdc to 4.0Vdc over a wide range
of input voltage (VIN = 3.0 – 5.8Vdc). 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,
overcurrent and overtemperature 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: DS03-082 ver. 1.34
PDF name: microlynx_smt_3.3v-5v.pdf
Data Sheet
June 24, 2008
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc 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
5.8
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
VO,set ≤ VIN – 0.5V
VIN
3.0
⎯
5.8
Vdc
Maximum Input Current
All
IIN,max
5.0
Adc
VO,set = 0.75 Vdc
IIN,No load
20
mA
VO,set = 3.3Vdc
IIN,No load
45
mA
All
IIN,stand-by
0.6
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
35
Input Ripple Rejection (120Hz)
All
30
(VIN= VIN, min to VIN, max, IO=IO, max VO,set = 3.3Vdc)
Input No Load Current
(VIN = 5.0Vdc, IO = 0, module enabled)
Input Stand-by Current
(VIN = 5.0Vdc, module disabled)
2
0.04
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
June 24, 2008
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Electrical Specifications (continued)
Parameter
Output Voltage Set-point
Device
Symbol
Min
Typ
Max
Unit
All
VO, set
–2.0
⎯
+2.0
% VO, set
All
VO, set
–3%
⎯
+3%
% VO, set
All
VO
0.7525
4.0
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
⎯
10
15
mVrms
Peak-to-Peak (5Hz to 20MHz bandwidth)
All
⎯
40
50
mVpk-pk
⎯
1000
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
⎯
All
CO, max
⎯
⎯
3000
μF
Output Current
All
Io
0
⎯
5
Adc
Output Current Limit Inception (Hiccup Mode )
All
IO, lim
⎯
220
⎯
% Io
Output Short-Circuit Current
All
IO, s/c
⎯
2
⎯
Adc
ESR ≥ 10 mΩ
(VO≤250mV) ( Hiccup Mode )
Efficiency
VIN= VIN, nom, TA=25°C
IO=IO, max , VO= VO,set
Switching Frequency
VO,set = 0.75Vdc
η
79.0
%
VO, set = 1.2Vdc
η
85.0
%
VO,set = 1.5Vdc
η
87.0
%
VO,set = 1.8Vdc
η
88.5
%
VO,set = 2.5Vdc
η
92.0
%
VO,set = 3.3Vdc
η
94.0
%
VO,set = 4.0Vdc
η
95.0
All
fsw
⎯
300
⎯
kHz
All
Vpk
⎯
130
⎯
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
⎯
130
⎯
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
June 24, 2008
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc 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
19, 000,000
⎯
2.8 (0.1)
Unit
Hours
⎯
g (oz.)
4
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 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
Min
Typ
Max
Unit
Von/Off
All
VIL
Ion/Off
All
IIL
―
―
0.4
V
―
―
10
μA
Von/Off
All
VIH
Ion/off
All
IIH
―
―
VIN
V
―
―
1
mA
All
Tdelay
3.9
msec
All
Tdelay
3.9
msec
All
Trise
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)
―
4.2
8.5
msec
―
1
% VO, set
⎯
150
⎯
°C
Output voltage overshoot – Startup
o
IO= IO, max; VIN = 3.0 to 5.8Vdc, TA = 25 C
Overtemperature Protection
All
Tref
(See Thermal Consideration section)
Input Undervoltage Lockout
Turn-on Threshold
All
⎯
2.2
⎯
V
Turn-off Threshold
All
⎯
2.0
⎯
V
LINEAGE POWER
5
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Characteristic Curves
The following figures provide typical characteristics for the Austin MicroLynxTM SMT modules at 25ºC.
88
95
90
EFFICIENCY, η (%)
EFFICIENCY, η (%)
85
82
79
Vin = 3.0V
76
Vin = 5.0V
73
85
Vin = 3.0V
80
Vin = 5.0V
75
Vin = 5.5V
Vin = 5.5V
70
0
1
2
3
4
70
5
0
OUTPUT CURRENT, IO (A)
3
4
5
Figure 4. Converter Efficiency versus Output Current
(Vout = 1.8Vdc).
100
95
95
EFFICIENCY, η (%)
90
EFFICIENCY, η (%)
2
OUTPUT CURRENT, IO (A)
Figure 1. Converter Efficiency versus Output Current
(Vout = 0.75Vdc).
85
Vin = 3.0V
80
Vin = 5.0V
75
Vin = 5.5V
90
85
Vin = 3.0V
80
Vin = 5.0V
75
Vin = 5.5V
70
70
0
1
2
3
OUTPUT CURRENT, IO (A)
4
0
5
Figure 2. Converter Efficiency versus Output Current
(Vout = 1.2Vdc).
1
2
3
4
5
OUTPUT CURRENT, IO (A)
Figure 5. Converter Efficiency versus Output Current
(Vout = 2.5Vdc).
95
100
95
EFFICIENCY, η (%)
90
EFFICIENCY, η (%)
1
85
Vin = 3.0V
80
Vin = 5.0V
75
Vin = 5.5V
70
0
1
2
3
4
OUTPUT CURRENT, IO (A)
Figure3. Converter Efficiency versus Output Current
(Vout = 1.5Vdc).
LINEAGE POWER
5
90
85
Vin = 4.5V
80
Vin = 5.0V
75
Vin = 5.5V
70
0
1
2
3
4
5
OUTPUT CURRENT, IO (A)
Figure 6. Converter Efficiency versus Output Current
(Vout = 3.3Vdc).
6
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Characteristic Curves
The following figures provide typical characteristics for the Austin MicroLynxTM SMT modules at 25ºC.
100
EFFICIENCY, η (%)
95
90
Vin=5.8V
Vin=5.5V
85
Vin=5.0V
80
75
70
0
1
2
3
4
5
OUTPUT CURRENT, IO (A)
Figure 7. Converter Efficiency versus Output Current
(Vout = 4.0Vdc).
LINEAGE POWER
7
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Characteristic Curves (continued)
0.5
1.5
2.5
3.5
INPUT VOLTAGE, VIN (V)
VO (V) (20mV/div)
OUTPUT VOLTAGE
Figure 8. Input voltage vs. Input Current
(Vout = 2.5Vdc).
TIME, t (2μs/div)
VO (V) (20mV/div)
OUTPUT VOLTAGE
Figure 9. Typical Output Ripple and Noise
(Vin = 5.0V dc, Vo = 0.75 Vdc, Io=5A).
TIME, t (2μs/div)
Figure 10. Typical Output Ripple and Noise
(Vin = 5.0V dc, Vo = 3.3 Vdc, Io=5A).
LINEAGE POWER
4.5
5.5
VO (V) (100mV/div)
IO (A) (2A/div)
0
TIME, t (5 μs/div)
Figure 11. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 3.3Vdc).
VO (V) (100mV/div)
1
IO (A) (2A/div)
2
OUTPUT CURRENT, OUTPUT VOLTAGE
Io =5A
3
TIME, t (5 μs/div)
Figure 12. Transient Response to Dynamic Load
Change from 100% to 50% of full load (Vo = 3.3 Vdc).
VO (V) (50mV/div)
Io =2.5A
4
IO (A) (2A/div)
INPUT CURRENT, IIN (A)
Io =0A
5
OUTPUT CURRENT, OUTPUT VOLTAGE
6
OUTPUT CURRENT, OUTPUT VOLTAGE
The following figures provide typical characteristics for the Austin MicroLynxTM SMT modules at 25ºC.
TIME, t (10μs/div)
Figure 13. Transient Response to Dynamic Load
Change from 50% to 100% of full load (Vo = 5.0 Vdc,
Cext = 2x150 μF Polymer Capacitors).
8
Data Sheet
June 24, 2008
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Characteristic Curves (continued)
Low-ESR external capacitors (7x150uF Polymer) (Vin
= 5.0Vdc, Vo = 3.3Vdc, Io = 5.0A, Co = 1050μF).
VIN (V) (2V/div)
Vo (V) (1V/div)
OUTPUT VOLTAGE, INPUT VOLTAGE
VOn/off (V) (2V/div)
TIME, t (2 ms/div)
Figure 18. Typical Start-Up Using Remote On/Off with
Prebias (Vin = 3.3Vdc, Vo = 1.8Vdc, Io = 1.0A, Vbias
=1.0Vdc).
OUTPUT CURRENT,
VOn/off (V) (2V/div)
VOV) (1V/div)
TIME, t (2 ms/div)
Figure 16. Typical Start-Up Using Remote On/Off with
LINEAGE POWER
On/Off VOLTAGE
VOn/off (V) (2V/div)
VOV) (1V/div)
On/Off VOLTAGE
OUTPUT VOLTAGE
Figure 15. Typical Start-Up Using Remote On/Off (Vin
= 5.0Vdc, Vo = 3.3Vdc, Io = 5.0A).
VOV) (1V/div)
On/Off VOLTAGE
OUTPUT VOLTAGE
TIME, t (2 ms/div)
TIME, t (2 ms/div)
Figure 17. Typical Start-Up with application of Vin
(Vin = 5.0Vdc, Vo = 3.3Vdc, Io = 5A).
OUTPUT VOLTAGE
TIME, t (10μs/div)
Figure 14. Transient Response to Dynamic Load
Change from 100% of 50% full load (Vo = 5.0 Vdc, Cext
= 2x150 μF Polymer Capacitors).
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 SMT modules at 25ºC.
TIME, t (5ms/div)
Figure 19. Output short circuit Current (Vin = 5.0Vdc,
Vo = 0.75Vdc).
9
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Characteristic Curves (continued)
6
6
5
5
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
The following figures provide thermal derating curves for the Austin MicroLynxTM SMT modules.
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
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
AMBIENT TEMPERATURE, TA C
Figure 20. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 5.0,
Vo=3.3Vdc).
Figure 23. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 3.3dc,
Vo=0.75 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 = 5.0Vdc,
Vo=0.75 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 22. Derating Output Current versus Local
Ambient Temperature and Airflow (Vin = 3.3Vdc,
Vo=2.5 Vdc).
LINEAGE POWER
10
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Test Configurations
Design Considerations
CURRENT PROBE
TO OSCILLOSCOPE
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 24. Input Reflected Ripple Current Test Setup.
COPPER STRIP
To minimize input voltage ripple, low-ESR polymer and
ceramic capacitors are recommended at the input of the
module. Figure 27 shows the input ripple voltage (mVpp) for various outputs with 1x150 µF polymer capacitors
(Panasonic p/n: EEFUE0J151R, Sanyo p/n: 6TPE150M)
in parallel with 1 x 47 µF ceramic capacitor (Panasonic
p/n: ECJ-5YB0J476M, Taiyo- Yuden p/n:
CEJMK432BJ476MMT) at full load. Figure 28 shows the
input ripple with 2x150 µF polymer capacitors in parallel
with 2 x 47 µF ceramic capacitor at full load.
RESISTIVE
LOAD
1uF
.
10uF
120
SCOPE
COM
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 25. Output Ripple and Noise Test Setup.
Input Ripple Voltage (mVp-p)
VO (+)
TM
The Austin MicroLynx 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
100
80
60
40
Vin = 3.3V
20
Vin = 5.0V
0
0
Rcontact
Rcontact
VIN(+)
VO
Rdistribution
RLOAD
VO
VIN
Rcontact
Rcontact
COM
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 26. Output Voltage and Efficiency Test Setup.
VO. IO
Efficiency
η =
VIN. IIN
x
100 %
1
2
3
4
Rdistribution
Output Voltage (Vdc)
Figure 27. Input ripple voltage for various output
with 1x150 µF polymer and 1x47 µF ceramic
capacitors at the input (full load).
120
Input Ripple Voltage (mVp-p)
Rdistribution
100
80
60
40
Vin = 3.3V
20
Vin = 5.0V
0
0
1
2
3
4
Output Voltage (Vdc)
Figure 28. Input ripple voltage for various output
with 2x150 µF polymer and 2x47 µF ceramic
capacitors at the input (full load).
LINEAGE POWER
11
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Design Considerations (continued)
Safety Considerations
Output Filtering
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.
TM
The Austin MicroLynx 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.
LINEAGE POWER
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.
12
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Feature Description
Overcurrent Protection
Remote On/Off
TM
The Austin MicroLynx SMT 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 the 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 29).
When the transistor Q1 is in the OFF state, the power
module is ON (Logic Low on the On/Off 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 = 2.5V
to 5.8V and the maximum IOn/Off = 1mA.
VIN(+)
Lynx-Series Module
Q1
Enable
20k
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
o
thermal reference point Tref, exceeds 150 C (typical), but
the thermal shutdown is not intended as a guarantee that
the unit will survive temperatures beyond its rating. The
module will automatically restart after it cools down.
IOn/Off
On/Off
Pin
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.
Css
14k
GND
Figure 29. Remote On/Off Implementation.
Remote On/Off can also be implemented using opencollector logic devices with an external pull-up resistor.
Figure 30 shows the circuit configuration using this
approach. Pull-up resistor Rpull-up, for the configuration
should be 5k (+/- 5%) for proper operation of 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
_
Figure 30. Remote On/Off Implementation using
logic-level devices and an external pull-up resistor.
LINEAGE POWER
13
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Feature Descriptions (continued)
Output Voltage Programming
V IN(+)
V O(+)
TM
The output voltage of the Austin MicroLynx SMT can be
programmed to any voltage from 0.75 Vdc to 4.0 Vdc by
connecting a single resistor (shown as Rtrim in Figure 31)
between the TRIM and GND pins of the module. Without
an external resistor between TRIM pin and the ground,
the output voltage of the module is 0.75 Vdc. To
calculate the value of the resistor Rtrim for a particular
output voltage Vo, use the following equation:
⎡ 21070
⎤
Rtrim = ⎢
− 5110⎥ Ω
Vo
−
0
.
7525
⎣
⎦
⎡ 21070
⎤
Rtrim = ⎢
− 5110⎥
1
.
8
−
0
.
7525
⎣
⎦
Vtrim
Table 1 provides Rtrim values required for some common
output voltages, while Table 2 provides values of the
external voltage source, Vtrim for the same common
output voltages.
VO, set (V)
Vout
ON/OFF
LOAD
TRIM
+
-
GND
Table 1
Rtrim = 15.004 kΩ
V O(+)
LOAD
TRIM
Figure 32. Circuit Configuration for programming
Output voltage using external voltage source.
For example, to program the output voltage of the Austin
MicroLynxTM module to 1.8 Vdc, Rtrim is calculated is
follows:
V IN(+)
ON/OFF
Rtrim (KΩ)
0.7525
Open
1.2
41.973
1.5
23.077
1.8
15.004
2.5
6.947
3.3
3.160
R trim
Table 2
GND
VO, set (V)
Figure 31. Circuit configuration for programming
output voltage using an external resistor.
TM
The Austin MicroLynx can also be programmed by
applying a voltage between the TRIM and the GND pins
(Figure 32). The following equation can be used to
determine the value of Vtrim needed to obtain a desired
output voltage Vo:
Vtrim = (0.7 − 0.1698 × {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 − 0.1698 × {3.3 − 0.7525})
Vtrim = 0.2670V
LINEAGE POWER
Vtrim (V)
0.7525
Open
1.2
0.6240
1.5
0.5731
1.8
0.5221
2.5
0.4033
3.3
0.2674
By using a 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.
14
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Feature Description (continued)
Voltage Margining
Output voltage margining can be implemented in the
TM
Austin MicroLynx 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 31 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 33. Circuit Configuration for margining Output
voltage.
LINEAGE POWER
15
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Thermal Considerations
Power modules operate in a variety of thermal
environments; however, sufficient cooling should always
be provided to help ensure reliable operation.
Considerations include ambient temperature, airflow,
module power dissipation, and the need for increased
reliability. A reduction in the operating temperature of the
module will result in an increase in reliability. The thermal
data presented here is based on physical measurements
taken in a wind tunnel. Note that the airflow is parallel to
the long axis of the module as shown in figure 34. The
test set-up is shown in figure 35. The derating data
applies to airflow in either direction of the module’s long
axis.
25.4_
(1.0)
Wind Tunnel
PWBs
Power Module
76.2_
(3.0)
x
Air Flow
5.97_
(0.235)
Probe Location
for measuring
airflow and
ambient
temperature
Air
flow
Figure 35. Thermal Test Set-up.
Top View
Tref
Heat Transfer via Convection
Increased airflow over the module enhances the heat
transfer via convection. Thermal derating curves showing
the maximum output current that can be delivered at
different local ambient temperatures (TA) for airflow
conditions ranging from natural convection and up to
1m/s (200 ft./min) are shown in the Characteristics
Curves section.
Bottom View
Figure 34. Tref Temperature measurement location.
The thermal reference point, Tref used in the
specifications is shown in Figure 34. For reliable
operation this temperature should not exceed 115oC.
The output power of the module should not exceed the
rated power of the module (Vo,set x Io,max).
Please refer to the Application Note “Thermal
Characterization Process For Open-Frame BoardMounted Power Modules” for a detailed discussion of
thermal aspects including maximum device
temperatures.
LINEAGE POWER
16
Data Sheet
June 24, 2008
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc 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): 0.004 (0.102)
LINEAGE POWER
17
Data Sheet
June 24, 2008
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc 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.)
LINEAGE POWER
18
Data Sheet
June 24, 2008
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Packaging Details
The Austin MicroLynxTM SMT version is supplied in tape & reel as standard. Modules are shipped in quantities of
500 modules per reel.
All Dimensions are in millimeters and (in inches).
Reel Dimensions:
Outside Dimensions:
Inside Dimensions:
Tape Width:
LINEAGE POWER
330.2 mm (13.00)
177.8 mm (7.00”)
44.00 mm (1.732”)
19
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Surface Mount Information
Pick and Place
Reflow Soldering Information
TM
The Austin MicroLynx SMT modules use an open
frame construction and are designed for a fully
automated assembly process. The modules are fitted
with a label designed to provide a large surface area
for pick and place operations. The label meets all the
requirements for surface mount processing, as well as
safety standards, and is able to withstand reflow
o
temperatures of up to 300 C. The label also carries
product information such as product code, serial
number and the location of manufacture.
TM
The Austin MicroLynx SMT power modules are
large mass, low thermal resistance devices and
typically heat up slower than other SMT components.
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.
o
Typically, the eutectic solder melts at 183 C, 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 pin temperatures.
All dimensions are in millimeters and (inches).
Figure 36. Pick and Place Location.
Nozzle Recommendations
The module weight has been kept to a minimum by
using open frame construction. Even so, these
modules have a relatively large mass when compared
to conventional SMT components. Variables such as
nozzle size, tip style, vacuum pressure and placement
speed should be considered to optimize this process.
The minimum recommended nozzle diameter for
reliable operation is 6mm. The maximum nozzle outer
diameter, which will safely fit within the allowable
component spacing, is 9 mm.
Oblong or oval nozzles up to 11 x 9 mm may also be
used within the space available.
LINEAGE POWER
Figure 37. Reflow Profile.
An example of a reflow profile (using 63/37 solder) for
the Austin MicroLynxTM SMT power module is :
•
Pre-heating zone: room temperature to 183oC
(2.0 to 4.0 minutes maximum)
•
Initial ramp rate < 2.5oC per second
o
o
•
Soaking Zone: 155 C to 183 C – 60 to 90
seconds typical (2.0 minutes maximum)
o
o
•
Reflow zone ramp rate:1.3 C to 1.6 C per second
o
o
•
Reflow zone: 210 C to 235 C peak temperature –
30 to 60 seconds (90 seconds maximum
20
Data Sheet
June 24, 2008
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Surface Mount Information (continued)
Lead Free Soldering
The –Z version Austin MicroLynx 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 Fig. 38.
sealed packages should not be broken until time of
use. Once the original package is broken, the floor
life of the product at conditions of ≤ 30°C and 60%
relative humidity varies according to the MSL rating
(see J-STD-033A). The shelf life for dry packed
SMT packages will be a minimum of 12 months
from the bag seal date, when stored at the
following conditions: < 40° C, < 90% relative
humidity.
Post Solder Cleaning and Drying
Considerations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The
result of inadequate cleaning and drying can affect
both the reliability of a power module and the
testability of the finished circuit-board assembly. For
guidance on appropriate soldering, cleaning and
drying procedures, refer to Board Mounted Power
Modules: Soldering and Cleaning Application Note
(AN04-001).
300
MSL Rating
Per J-STD-020 Rev. C
Peak Temp 260°C
The Austin MicroLynx SMT modules have a MSL
rating of 1.
Storage and Handling
The recommended storage environment and
handling procedures for moisture-sensitive surface
mount packages is detailed in J-STD-033 Rev. A
(Handling, Packing, Shipping and Use of
Moisture/Reflow Sensitive Surface Mount Devices).
Moisture barrier bags (MBB) with desiccant are
required for MSL ratings of 2 or greater. These
LINEAGE POWER
Reflow Temp (°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
0
Reflow Time (Seconds)
Figure 38. Recommended linear reflow profile
using Sn/Ag/Cu solder.
21
Austin MicroLynxTM SMT Non-isolated Power Modules:
3.0 – 5.8Vdc input; 0.75Vdc to 4.0Vdc Output; 5A output current
Data Sheet
June 24, 2008
Ordering Information
Please contact your Lineage Power Sales Representative for pricing, availability and optional features.
Table 3. Device Codes
Product codes
Input Voltage
Output Voltage
Output
Current
Efficiency
3.3V @ 5A
Connector
Type
Comcode
AXH005A0X-SR
3.0 – 5.8 Vdc
0.75 – 4.0 Vdc
5A
94.0%
SMT
108979667
AXH005A0X-SRZ
3.0 – 5.8 Vdc
0.75 – 4.0 Vdc
5A
94.0%
SMT
109100518
-Z refers to RoHS-compliant parts
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.
LINEAGE POWER
22
Document No: DS03-082 ver. 1.34
PDF name: microlynx_smt_3.3v-5v.pdf