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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 (-40C to 85C) 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 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.
TM
* 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 Input Voltage Continuous Operating Ambient Temperature (see Thermal Considerations section) Storage Temperature All Tstg -55 125 C All TA -40 85 C Device All Symbol VIN Min -0.3 Max 15 Unit Vdc
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
Parameter Operating Input Voltage Maximum Input Current (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) Inrush Transient Input Reflected Ripple Current, peak-to-peak (5Hz to 20MHz, 1H source impedance; VIN, min to VIN, max, IO= IOmax ; See Test configuration section) Input Ripple Rejection (120Hz) All All All It 30 30
2
Device All All VO,set = 0.75 Vdc VO,set = 5.0Vdc All
Symbol VIN IIN,max IIN,No load IIN,No load IIN,stand-by
Min 10
Typ 12
Max 14 3.5
Unit Vdc Adc mA mA mA
17 100 1.2
0.4
As mAp-p dB
2
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.
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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
Electrical Specifications (continued)
Parameter Output Voltage Set-point (VIN=IN, min, IO=IO, max, TA=25C) 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) Load (IO=IO, min to IO, max) Temperature (Tref=TA, min to TA, max) Output Ripple and Noise on nominal output (VIN=VIN, nom and IO=IO, min to IO, max Cout = 1F ceramic//10Ftantalum capacitors) RMS (5Hz to 20MHz bandwidth) Peak-to-Peak (5Hz to 20MHz bandwidth) External Capacitance ESR 1 m ESR 10 m Output Current Output Current Limit Inception (Hiccup Mode ) (VO= 90% of VO, set) Output Short-Circuit Current (VO250mV) ( Hiccup Mode ) Efficiency VIN= VIN, nom, TA=25C IO=IO, max , VO= VO,set VO, set = 1.2Vdc VO,set = 1.5Vdc VO,set = 1.8Vdc VO,set = 2.5Vdc VO,set = 3.3Vdc VO,set = 5.0Vdc Switching Frequency Dynamic Load Response (dIo/dt=2.5A/s; VIN = VIN, nom; TA=25C) Load Change from Io= 50% to 100% of Io,max; 1F ceramic// 10 F tantalum Peak Deviation Settling Time (Vo<10% peak deviation) (dIo/dt=2.5A/s; VIN = VIN, nom; TA=25C) Load Change from Io= 100% to 50%of Io,max: 1F ceramic// 10 F tantalum Peak Deviation Settling Time (Vo<10% peak deviation) All ts 25 s All All ts Vpk 25 200 s mV All Vpk 200 mV All fsw 81.5 84.0 85.0 87.0 89.0 92.0 300 % % % % % % kHz All IO, s/c 2 Adc All All All All CO, max CO, max Io IO, lim 0 200 1000 3000 5 F F Adc % Io All All 15 30 30 75 mVrms mVpk-pk All All All 0.3 0.4 0.4 % VO, set % VO, set % VO, set All VO 0.7525 5.5 Vdc All VO, set -2.5% +3.5% % VO, set Device All Symbol VO, set Min -2.0 Typ VO, set Max +2.0 Unit % VO, set
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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
Electrical Specifications (continued)
Parameter Dynamic Load Response (dIo/dt=2.5A/s; V VIN = VIN, nom; TA=25C) Load Change from Io= 50% to 100% of Io,max; Co = 2x150 F polymer capacitors Peak Deviation Settling Time (Vo<10% peak deviation) (dIo/dt=2.5A/s; VIN = VIN, nom; TA=25C) Load Change from Io= 100% to 50%of Io,max: Co = 2x150 F polymer capacitors Peak Deviation Settling Time (Vo<10% peak deviation) All All ts Vpk 50 50 s mV All Vpk 50 mV Device Symbol Min Typ Max Unit
All
ts
50
s
General Specifications
Parameter Calculated MTBF (IO=IO, max, TA=25C) Weight Min Typ 5,677,000 2.8 (0.1) Max Unit Hours g (oz.)
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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
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions for additional information.
Parameter 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 Ion/Off Logic High (Von/Off > 2.5V - Module Off) Von/Off Ion/off Turn-On Delay and Rise Times (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 IO= IO, max; VIN = 10 to 14Vdc, TA = 25 C Overtemperature Protection (See Thermal Consideration section) Input Undervoltage Lockout Turn-on Threshold Turn-off Threshold All All 8.2 8.0 V V All Tref 140 C
o o
Device
Symbol
Min
Typ
Max
Unit
All All All All
VIL IIL VIH IIH

0.4 10 VIN, max 1
V A V mA
All
Tdelay
3
msec
All
Tdelay
3
msec
All
Trise
4
6 1
msec % VO, set
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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
Characteristic Curves
The following figures provide typical characteristics for the Austin MicroLynxTM 12V SMT modules at 25C.
86 84 82
91 88
EFFICIENCY, (%)
80 78 76 74 72 70 0 1 2 3 4
EFFICIENCY, (%)
85 82 79
VIN = 1 0V VIN = 1 2V VIN= 1 4V
5
VIN = 1 0V
76
VIN = 1 2V
73
VIN= 1 4V
70 0 1 2 3 4 5
OUTPUT CURRENT, IO (A)
OUTPUT CURRENT, IO (A)
Figure 1. Converter Efficiency versus Output Current (Vout = 1.2Vdc).
88 86 84
Figure 4. Converter Efficiency versus Output Current (Vout = 2.5Vdc).
91 88
EFFICIENCY, (%)
82 80 78 76 74 72 70 0 1 2 3 4
EFFICIENCY, (%)
85 82 79
VIN = 1 0V
76
VIN = 1 0V VIN = 1 2V VIN= 1 4V
5
VIN = 1 2V
73
VIN= 1 4V
70 0 1 2 3 4 5
OUTPUT CURRENT, IO (A)
OUTPUT CURRENT, IO (A)
Figure 2. Converter Efficiency versus Output Current (Vout = 1.5Vdc).
88 86 84
Figure 5. Converter Efficiency versus Output Current (Vout = 3.3Vdc).
96 93 90 87 84 81 78 75
EFFICIENCY, (%)
82 80 78 76 74 72 70 0 1 2 3 4 5
EFFICIENCY, (%)
VIN = 1 0V VIN = 1 2V VIN= 1 4V
0 1 2 3 4 5
VIN = 1 0V VIN = 1 2V VIN= 1 4V
OUTPUT CURRENT, IO (A)
OUTPUT CURRENT, IO (A)
Figure 3. Converter Efficiency versus Output Current (Vout = 1.8Vdc).
Figure 6. Converter Efficiency versus Output Current (Vout = 5.0Vdc).
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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
Characteristic Curves (continued)
The following figures provide typical characteristics for the MicroLynxTM 12V SMT modules at 25C.
4
3.5
INPUT CURRENT, IIN (A)
Io = 2.5A
3 2.5 2 1.5 1 0.5 0 6 8 10 12 14
Io = 5A
Figure 7. Input voltage vs. Input Current (Vout = 5.0Vdc).
INPUT VOLTAGE, VIN (V)
IO (A) (2A/div)
VO (V) (100mV/div)
Io = 0A
OUTPUT CURRENT, OUTPUT VOLTAGE
Figure 10. Transient Response to Dynamic Load Change from 50% to 100% of full load (Vo = 3.3Vdc).
OUTPUT CURRENT, OUTPUT VOLTAGE VO (V) (100mV/div)
TIME, t (5 s/div)
OUTPUT VOLTAGE
VO (V) (10mV/div)
IO (A) (2A/div)
TIME, t (2s/div)
TIME, t (5 s/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 CURRENT, OUTPUT VOLTAGE
OUTPUT VOLTAGE
VO (V) (10mV/div)
TIME, t (2s/div)
IO (A) (2A/div)
VO (V) (50mV/div)
TIME, t (10s/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 F Polymer Capacitors).
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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
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin MicroLynxTM 12V SMT modules at 25C.
OUTPUT CURRENT OUTPUTVOLTAGE IO (A) (2A/div) VO (V) (50mV/div)
OUTPUT VOLTAGE, Vo (V) (2V/div)
INPUT VOLTAGE VIN (V) (5V/div)
TIME, t (10s/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 F Polymer Capacitors).
VOn/off (V) (5V/div) On/Off VOLTAGE
Figure 16. Typical Start-Up with application of Vin with (Vin = 12Vdc, Vo = 3.3Vdc, Io = 5A).
On/Off VOLTAGE OUTPUT VOLTAGE VOn/off (V) (2V/div) VOV) (1V/div)
OUTPUT VOLTAGE
VOV) (2V/div)
TIME, t (1 ms/div)
TIME, t (1 ms/div)
Figure 14. Typical Start-Up Using Remote On/Off (Vin = 12Vdc, Vo = 3.3Vdc, Io = 5.0A).
On/Off VOLTAGE VOn/off (V) (2V/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,
OUTPUT VOLTAGE
VOV) (1V/div)
TIME, t (2 ms/div)
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 = 1050F).
Figure 18. Output short circuit Current (Vin = 12Vdc, Vo = 0.75Vdc).
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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
Characteristic Curves (continued)
The following figures provide thermal derating curves for the Austin MicroLynxTM 12V SMT modules.
6 6
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
5 4 3 NC 2 0.5m/s (100 LFM ) 1 0 20 30 40 50 60 70
O
5 4 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
O
NC 0.5m/s (100 LFM )
80
90
80
90
AMBIENT TEMPERATURE, TA C
AMBIENT TEMPERATURE, TA C
Figure 19. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 12Vdc, Vo=0.75Vdc).
6 5 4 3 NC 2 0.5m/s (100 LFM ) 1 1.0m/s (200 LFM ) 0 20 30 40 50 60 70
O
Figure 22. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 12Vdc, Vo=5.0 Vdc).
OUTPUT CURRENT, Io (A)
80
90
AMBIENT TEMPERATURE, TA C
Figure 20. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 12Vdc, Vo=1.8 Vdc).
6
OUTPUT CURRENT, Io (A)
5 4 3 NC 2 0.5m/s (100 LFM ) 1 1.0m/s (200 LFM ) 0 20 30 40 50 60 70
O
80
90
AMBIENT TEMPERATURE, TA C
Figure 21. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 12Vdc, Vo=3.3 Vdc).
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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
Test Configurations
TO OSCILLOSCOPE LTEST 1H VIN(+) CURRENT PROBE
Design Considerations
Input Filtering
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. In a typical application, 2x47 F low-ESR tantalum capacitors (AVX part #: TPSE476M025R0100, 47F 25V 100 m 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 F tantalum capacitors and with 2x 22 F ceramic capacitor (TDK part #: C4532X5R1C226M) at full load.
350
TM
BATTERY
CS 1000F Electrolytic E.S.R.<0.1 @ 20C 100kHz
CIN 2x100F Tantalum COM
NOTE: Measure input reflected ripple current with a simulated source inductance (LTEST) of 1H. Capacitor CS offsets possible battery impedance. Measure current as shown above.
Figure 23. Input Reflected Ripple Current Test Setup.
COPPER STRIP VO (+) 1uF COM . 10uF SCOPE RESISTIVE LOAD
Input Ripple Voltage (mVp-p)
300 250 200 150 100 50 0 0 1 2 3 4 5 6 Tantalum Ceramic
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.
Rdistribution
Rcontact VIN(+) VO
Rcontact
Rdistribution
VIN
VO
RLOAD
Output Voltage (Vdc) Figure 26. Input ripple voltage for various output with 2x47 F tantalum capacitors and with 2x22 F ceramic capacitors at the input (80% of Io,max).
Rdistribution
Rcontact COM COM
Rcontact
Rdistribution
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 = VIN. IIN x 100 %
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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
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 F ceramic and 10 F 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 fastacting fuse with a maximum rating of 6A in the positive input lead.
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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
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.
Feature Description
Remote On/Off
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 10A. 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(+)
TM
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.
Lynx-series Module
IOn/Off On/Off Pin 20k Enable 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+ Rpull-up I ON/OFF ON/OFF + VON/OFF PWM Enable R1 Q2 R2 GND _ CSS
MODULE
Q1
Feature Descriptions (continued)
Figure 27a. Remote On/Off Implementation using logic-level devices and an external pull-up resistor
Output Voltage Programming
The output voltage of the Austin MicroLynx 12V can be programmed to any voltage from 0.75Vdc to 5.5Vdc by
TM
Overcurrent Protection
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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
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 TRIM LOAD
10500 Rtrim = - 1000 Vo - 0.7525
Rtrim is the external resistor in Vo is the desired output voltage
GND
+ -
Vtrim
For example, to program the output voltage of the Austin MicroLynxTM 12V module to 1.8V, Rtrim is calculated as follows:
Figure 29. Circuit Configuration for programming Output voltage using external voltage source
Rtrim =
10500 - 1000 1.8 - 0.7525
Rtrim = 9.024 k
V IN(+) V O(+)
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 (K)
0.7525
ON/OFF TRIM R trim GND LOAD
Open 22.46 13.05 9.024 5.009 3.122 1.472
1.2 1.5 1.8 2.5 3.3 5.0
Figure 28. Circuit configuration to program output voltage using an external resistor
Table 2
VO, set (V) Vtrim (V)
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:
TM
0.7525 1.2 1.5 1.8 2.5 3.3 5.0
Open 0.670 0.650 0.630 0.583 0.530 0.4166
Vtrim = (0.7 - 0.0667 x { - 0.7525}) Vo
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 x {3.3 - 0.7525}) Vtrim = 0.530V
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.
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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
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.
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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
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.
Wind Tunnel PWBs 25.4_ (1.0)
Power Module
76.2_ (3.0)
x
Air Flow Tref1 (inductor winding)
7.24_ (0.285)
Probe Location for measuring airflow and ambient temperature
Air flow
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.
Top View
Tref2
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 1 2 3 4 5 FUNCTION On/Off VIN GND Trim 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 1 2 3 4 5
FUNCTION On/Off VIN GND Trim 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
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 330.2 mm (13.00) 177.8 mm (7.00") 44.0 mm (1.73")
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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
Surface Mount Information
Pick and Place
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.
TM
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
250
REFLOW TEMP (C)
200
Heat zo ne max 4oCs -1
Co o ling zo ne 1 oCs -1 -4
150
100
So ak zo ne 30-240s P reheat zo ne max 4oCs -1
Figure 33. Pick and Place Location.
Tlim above 205oC
50
Nozzle Recommendations
The module weight has been kept to a minimum by using open frame construction. Even so, these modules have a relatively large mass when compared to conventional SMT components. Variables such as nozzle size, tip style, vacuum pressure and pick & placement speed should be considered to optimize this process. The minimum recommended nozzle diameter for reliable operation is 3mm. The maximum nozzle outer diameter, which will safely fit within the allowable component spacing, is 8 mm max.
0
REFLOW TIME (S)
Figure 34. Reflow Profile for Tin/Lead (Sn/Pb) process.
240 235
MAX TEMP SOLDER (C)
230 225 220 215 210 205 200 0 10 20 30 40 50 60
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. 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,
Figure 35. Time Limit Curve Above 205 C for Tin/Lead (Sn/Pb) process.
o
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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
Modules: Soldering and Cleaning Application Note (AN04-001).
300 Per J-STD-020 Rev. C Peak Temp 260C 250 Cooling Zone
Surface Mount Information (continued)
Lead Free Soldering
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.
Reflow Temp (C)
200 * Min. Time Above 235C 15 Seconds Heating Zone 1C/Second *Time Above 217C 60 Seconds
150
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 30C 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
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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
Ordering Information
Please contact your Lineage Power representative for pricing, availability and optional features. Table 3. Device Codes
Device Code AXA005A0X-SR AXA005A0X-SRZ Input Voltage Range 10 - 14Vdc 10 - 14Vdc Output Voltage 0.75 - 5.5Vdc 0.75 - 5.5Vdc Output Current 5A 5A Efficiency 3.3V@ 6A On/Off Logic Negative Negative Connector Type SMT SMT Comcodes 108981622 108995172
89.0% 89.0%
-Z refers to RoHS compliant versions
Asia-Pacific Headquarters Tel: +65 6416 4283 Europe, Middle-East and Africa Headquarters Tel: +49 89 6089 286 India Headquarters Tel: +91 80 28411633
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: techsupport1@lineagepower.com
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. (c) 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

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