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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0Vdc -5.5Vdc Input; 0.75Vdc to 3.63Vdc Output;10A 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 10A output current High efficiency - 95% at 3.3V full load (VIN = 5.0V) Small size and low profile: 33.0 mm x 13.5 mm x 8.28 mm (1.30 in x 0.53 in x 0.326 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 = 15.7 M hours at 25oC Full-load Constant switching frequency (300 kHz) Output voltage programmable from 0.75 Vdc to 3.63Vdc via external resistor Line Regulation: 0.3% (typical) Load Regulation: 0.4% (typical) Temperature Regulation: 0.4 % (typical) Remote On/Off Remote Sense(optional) Over temperature protection Output overcurrent protection (non-latching) Wide operating temperature range (-40C to 85C) UL* 60950-1Recognized, CSA C22.2 No. 60950-103 Certified, and VDE 0805:2001-12 (EN60950-1) Licensed ISO** 9001 and ISO 14001 certified manufacturing facilities
Description
Austin LynxTM SMT (surface mount technology) power modules are non-isolated dc-dc converters that can deliver up to 10A of output current with full load efficiency of 95% at 3.3V output. These modules provide a precisely regulated output voltage programmable via an external resistor from 0.75Vdc to 3.63Vdc over a wide range of input voltage (VIN = 3.0 - 5.5Vdc). Their open-frame construction and small footprint enable designers to develop costand space-efficient solutions. Standard features include remote On/Off, remote sense, programmable output voltage, over current and over temperature protections.
* UL is a registered trademark of Underwriters Laboratories, Inc.

CSA is a registered trademark of Canadian Standards Association. VDE is a trademark of Verband Deutscher Elektrotechniker e.V. ** ISO is a registered trademark of the International Organization of Standards
Document No: DS04-031 ver. 1.54 PDF name: lynx_po_smt.pdf
Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A 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 5.8 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 VO,set = 3.3Vdc) Input No Load Current (VIN = 5.0Vdc, IO = 0, module enabled) Input Stand-by Current (VIN = 5.0Vdc, 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 It
2
Device VO,set VIN - 0.5V All VO,set = 0.75Vdc VO,set = 3.3Vdc All
Symbol VIN IIN,max IIN,No load IIN,No load IIN,stand-by
Min 3.0
Typ
Max 5.5 10
Unit Vdc Adc mA mA mA
25 30 1.5
0.1
As
2
All
100
mAp-p
All
30
dB
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to being part of a complex power architecture. To preserve maximum flexibility, internal fusing is not included, however, to achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a 15A, time-delay fuse (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 January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Electrical Specifications (continued)
Parameter Output Voltage Set-point (VIN=VIN, 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 = 0.75Vdc VO, set = 1.2Vdc VO,set = 1.5Vdc VO,set = 1.8Vdc VO,set = 2.5Vdc VO,set = 3.3Vdc 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 82.5 88.0 89.5 91.0 93.0 95.0 300 % % % % % % kHz All IO, s/c 2 Adc All All All All CO, max CO, max Io IO, lim 0 220 1000 5000 10 F F Adc % Io All All 8 25 15 50 mVrms mVpk-pk All All All 0.3 0.4 0.4 % VO, set % VO, set % VO, set All VO 0.7525 3.63 Vdc All VO, set -3% +3% % 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 January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A 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 100 100 s mV All Vpk 100 mV Device Symbol Min Typ Max Unit
All
ts
100
s
General Specifications
Parameter Calculated MTBF (IO=IO, max, TA=25C) Telecordia SR-332 Issue 1: Method 1 Case 3 Weight 5.6 (0.2) g (oz.) Min Typ 15,726,000 Max Unit Hours
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A 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 On/Off Signal interface (On/Off is open collector/drain logic input; Signal referenced to GND - See feature description section) Input High Voltage (Module ON) Input High Current Input Low Voltage (Module OFF) Input Low Current Turn-On Delay and Rise Times (IO=IO, max , VIN=VIN, nom, TA = 25 C) Case 1: On/Off input is set to Logic High (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 High (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 = 3.0 to 5.5Vdc, TA = 25 C Remote Sense Range Overtemperature Protection (See Thermal Consideration section) Input Undervoltage Lockout Turn-on Threshold Turn-off Threshold All All 2.2 2.0 V V All Tref 125 0.5 V C
o o
Device
Symbol
Min
Typ
Max
Unit
All All All All
VIH IIH VIL IIL
-0.2
0.2
VIN, max 10 0.3 1
V A V mA
All
Tdelay
3.9
msec
All
Tdelay
3.9
msec
All
Trise
4.2
8.5 1
msec % VO, set
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Characteristic Curves
The following figures provide typical characteristics for the Austin Lynx
90 96
TM
SMT modules at 25C.
VIN = 3.0V
87 84 81 78 75 72 0 2.5 5 7.5 10
93 90
EFFICIENCY, ()
EFFICIENCY, ()
87 84 81 78 75 72 0 2.5 5 7.5 10
VIN = 3.0V VIN = 5.0V VIN = 5.5V
VIN = 5.0V VIN = 5.5V
OUTPUT CURRENT, IO (A)
OUTPUT CURRENT, IO (A)
Figure 1. Converter Efficiency versus Output Current (Vout = 0.75Vdc).
93 90 87
Figure 4. Converter Efficiency versus Output Current (Vout = 1.8Vdc).
100 97 94
EFFICIENCY, ()
84 81 78 75
EFFICIENCY, ()
91 88 85 82 79 76 73
VIN = 3.0V VIN = 5.0V VIN = 5.5V
VIN = 3.0V VIN = 5.0V VIN = 5.5V
0 2.5 5 7.5 10
72 0 2.5 5 7.5 10
Figure 2. Converter Efficiency versus Output Current (Vout = 1.2Vdc).
94 91 88
OUTPUT CURRENT, IO (A)
Figure 5. Converter Efficiency versus Output Current (Vout = 2.5Vdc).
100 97 94
OUTPUT CURRENT, IO (A)
EFFICIENCY, ()
85 82 79 76 73 70 0 2.5 5 7.5 10
EFFICIENCY, ()
91 88 85 82 79 76 0 2.5 5 7.5 10
VIN = 3.0V VIN = 5.0V VIN = 5.5V
VIN = 4.5V VIN = 5.0V VIN = 5.5V
OUTPUT CURRENT, IO (A)
OUTPUT CURRENT, IO (A)
Figure 3. Converter Efficiency versus Output Current (Vout = 1.5Vdc).
Figure 6. Converter Efficiency versus Output Current (Vout = 3.3Vdc).
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin Lynx
10 9
TM
SMT modules at 25C.
OUTPUT CURRENT, OUTPUT VOLTAGE
Io=10A Io=5A Io=0A
INPUT CURRENT, IIN (A)
8 7 6 5 4 3 2 1 0 0.5 1.5 2.5 3.5 4.5
5.5
INPUT VOLTAGE, VIN (V)
IO (A) (5A/div)
VO (V) (200mV/div)
TIME, t (10s/div)
Figure 7. Input voltage vs. Input Current (Vo = 2.5Vdc).
Figure 10. Transient Response to Dynamic Load Change from 50% to 100% of full load (Vo = 3.3Vdc).
OUTPUT CURRENT, OUTPUT VOLTAG IO (A) (5A/div) VO (V) (200mV/div)
OUTPUT VOLTAGE
VO (V) (20mV/div)
TIME, t (2s/div)
TIME, t (10s/div)
Figure 8. Typical Output Ripple and Noise (Vin = 5.0V dc, Vo = 0.75 Vdc, Io=10A).
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) (20mV/div)
TIME, t (2s/div)
IO (A) (5A/div)
VO (V) (50mV/div)
TIME, t (20s/div)
Figure 9. Typical Output Ripple and Noise (Vin = 5.0V dc, Vo = 3.3 Vdc, Io=10A).
Figure 12. Transient Response to Dynamic Load Change from 50% to 100% of full load (Vo = 3.3 Vdc, Cext = 2x150 F Polymer Capacitors).
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Characteristic Curves (continued)
The following figures provide typical characteristics for the Austin LynxTM SMT modules at 25C.
OUTPUT CURRENT, OUTPUT VOLTAGE
VO (V) (50mV/div)
OUTPUT VOLTAGE INPUT VOLTAGE
VOn/off (V) (2V/div)
IO (A) (5A/div)
VO (V)(1V/div)
TIME, t (20s/div)
TIME, t (2 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).
OUTPUT VOLTAGE VO (V)(1V/div)
Figure 16. Typical Start-Up with application of Vin (Vin = 5.5Vdc, Vo = 3.3Vdc, Io = 10A).
OUTPUT VOLTAGE
VOn/off (V) (5V/div)
On/Off VOLTAGE
TIME, t (2 ms/div)
INPUT VOLTAGE
VOn/off (V) (2V/div)
VO (V)(1V/div)
TIME, t (2 ms/div)
Figure 14. Typical Start-Up Using Remote On/Off (Vin = 5.0Vdc, Vo = 3.3Vdc, Io = 10.0A).
Figure 17 Typical Start-Up Using Remote On/Off with Prebias (Vin = 3.3Vdc, Vo = 1.8Vdc, Io = 1.0A, Vbias =1.0Vdc).
OUTPUT VOLTAGE
VO (V)(1V/div)
OUTPUT CURRENT,
On/Off VOLTAGE
VOn/off (V) (5V/div)
TIME, t (2 ms/div)
IO (A) (10A/div)
TIME, t (10ms/div)
Figure 15. Typical Start-Up Using Remote On/Off with
Low-ESR external capacitors (Vin = 5.5Vdc, Vo = 3.3Vdc, Io = 10.0A, Co = 1050F).
Figure 18. Output short circuit Current (Vin = 5.0Vdc, Vo = 0.75Vdc).
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Characteristic Curves (continued)
The following figures provide thermal derating curves for the Austin LynxTM SMT modules.
12 10 8 6 4 NC 2 100 LFM 0 20 30 40 50 60 70
O
12 10 8 6 4 NC 2 100 LFM 0 20 30 40 50 60 70
O
OUTPUT CURRENT, Io (A)
80
90
OUTPUT CURRENT, Io (A)
80
90
Figure 19. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 5.0, Vo=0.75Vdc).
12 10 8 6 4 NC 2 100 LFM 0 20 30 40 50 60 70
O
AMBIENT TEMPERATURE, TA C
Figure 22. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 5.0dc, Vo=3.3 Vdc).
12 10 8 6 4
AMBIENT TEMPERATURE, TA C
OUTPUT CURRENT, Io (A)
OUTPUT CURRENT, Io (A)
NC
2 0 20 30 40 50 60 70
O
80
90
80
90
AMBIENT TEMPERATURE, TA C
AMBIENT TEMPERATURE, TA C
Figure 20. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 5.0Vdc, Vo=1.8 Vdc).
12 10 8 6 4 NC 2 100 LFM 0 20 30 40 50 60 70
O
Figure 23. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 3.3Vdc, Vo=2.5 Vdc).
OUTPUT CURRENT, Io (A)
80
90
AMBIENT TEMPERATURE, TA C
Figure 21. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 5.0Vdc, Vo=2.5 Vdc).
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Test Configurations
TO OSCILLOSCOPE LTEST 1H VIN(+) CURRENT PROBE
Design Considerations
Input Filtering
Austin Lynx 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. To minimize input voltage ripple, low-ESR polymer and ceramic capacitors are recommended at the input of the module. Figure 27 shows input ripple voltage (mVp-p) for various outputs with 1x150 F polymer capacitors (Panasonic p/n: EEFUE0J151R, Sanyo p/n: 6TPE150M) in parallel with 1 x 47 F ceramic capacitor (Panasonic p/n: ECJ-5YB0J476M, Taiyo- Yuden p/n: CEJMK432BJ476MMT) at full load. Figure 28 shows the input ripple with 2x150 F polymer capacitors in parallel with 2 x 47 F ceramic capacitor at full load. Input Ripple Voltage (mVp-p)
200 180 160 140 120 100 80 60 40 20 0 0 0.5
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 24. Input Reflected Ripple Current Test Setup.
COPPER STRIP VO (+) 1uF COM . 10uF SCOPE RESISTIVE LOAD
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.
3.3Vin 5Vin 1 1.5 2 2.5 3 3.5
Figure 25. Output Ripple and Noise Test Setup.
Rdistribution
Rcontact VIN(+) VO
Rcontact
Rdistribution
VIN
VO
RLOAD
Output Voltage (Vdc) Figure 27. Input ripple voltage for various output with 1x150 F polymer and 1x47 F ceramic capacitors at the input (full load).
140
Rdistribution
Rcontact COM COM
Rcontact
Rdistribution
Input Ripple Voltage (mVp-p)
120 100 80 60 40 20 0 0 0.5 1 1.5 2 2.5 3 3.5 3.3Vin 5Vin
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 = VIN. IIN x 100 %
Output Voltage (Vdc) Figure 28. Input ripple voltage for various output with 2x150 F polymer and 2x47 F ceramic capacitors at the input (full load).
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Design Considerations (continued)
Output Filtering
The Austin Lynx SMT module is designed for low output ripple voltage and will meet the maximum output ripple specification with 1 F ceramic and 10 F 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.
TM
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 15A in the positive input lead.
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
R d istrib u tio n R co n ta c t
V IN (+ ) VO S e n se R LO AD
Feature Description
Remote On/Off
The Austin Lynx SMT power modules feature an On/Off pin for remote On/Off operation. The On/Off pin is an open collector/drain logic input signal (Von/Off) that is referenced to ground. Circuit configuration for using the On/Off pin is shown in Figure 29. During a logic-high (On/Off pin is pulled high internal to the module) when the transistor Q1 is in the Off state, the power module is ON. Maximum allowable leakage current of the transistor when Von/off = VIN,max is 10A. Applying a logic-low when the transistor Q1 is turnedOn, the power module is OFF. During this state VOn/Off must be less than 0.3V. When not using positive logic On/off pin, leave the pin unconnected or tie to VIN.
VIN+ R2 ON/OFF + VON/OFF R1 Q2
TM
R c o nta ct
R d istrib utio n
R d istrib u tio n
R co n ta c t
COM COM
R c o nta ct
R d istrib utio n
Figure 32. Remote sense circuit configuration.
Overcurrent Protection
To provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting circuitry and can endure current limiting continuously. At the point of current-limit inception, the unit enters hiccup mode. The unit operates normally once the output current is brought back into its specified range. The typical average output current during hiccup is 3A.
MODULE
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.
I ON/OFF
PWM Enable R3 Q1 Q3 R4 CSS
Overtemperature Protection
To provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. The unit will shutdown if the thermal reference point Tref, exceeds 125oC (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.
GND
_
Figure 29. Circuit configuration for using positive logic On/OFF.
Output Voltage Programming
The output voltage of the Austin LynxTM SMT can be programmed to any voltage from 0.75 Vdc to 3.63 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 the TRIM pin and the ground, the output voltage of the module is 0.7525 Vdc. To calculate the value of the resistor Rtrim for a particular output voltage Vo, use the following equation:
Remote Sense
The Austin LynxTM SMT power modules offer an option for Remote Sense feature. When the device code description includes a suffix "3", sense pin is added to the module and the Remote Sense feature is active. See ordering information at the end of this document for code description. Remote sense minimizes the effects of distribution losses by regulating the voltage at the load via Sense and GND pins (see Figure 30). The voltage between the Sense pin and Vo pin must not exceed 0.5V. The amount of power delivered by the module is defined as the output voltage multiplied by the output current (Vo x Io). When using Remote Sense, the output voltage of the module can increase, which if the same output is maintained, increases the power output by the module. Make sure that the maximum output power of the module remains at or below the maximum rated power. When the Remote Sense feature is not being used, tie the Sense pin to output pin.
21070 Rtrim = - 5110 Vo - 0.7525
For example, to program the output voltage of the Austin LynxTM II module to 1.8 Vdc, Rtrim is calculated is follows:
21070 Rtrim = - 5110 1.8 - 0.7525
Rtrim = 15.004 k
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Feature Descriptions (continued)
Output Voltage Programming (continued)
from the Trim pin to the Output pin for marginingdown. Figure 32 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
down,
V IN(+)
V O(+)
ON/OFF
TRIM R trim
LOAD
Austin Lynx or Lynx II Series Q2 Trim
Rmargin-down
GND
Figure 31. Circuit configuration for programming output voltage using an external resistor.
Rtrim
Rmargin-up
Table 1 provides Rtrim values required for some common output voltages.
Q1 GND
Table 1
VO, (V) 0.7525 1.2 1.5 1.8 2.5 3.3 Rtrim (K) Open 41.973 23.077 15.004 6.947 3.160
Figure 32. Circuit Configuration for margining Output voltage.
By a 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. 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 TM Austin Lynx modules by connecting a resistor, Rmarginup, from the Trim pin to the ground pin for margining-up the output voltage and by connecting a resistor, Rmargin-
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Thermal Considerations
The 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. The test set-up is shown in Figure 34. Note that the airflow is parallel to the long axis of the module as shown in figure 33. The derating data applies to airflow in either direction of the module's long axis.
Wind T unnel PWBs 25.4_ (1.0)
Power Module
76.2_ (3.0)
x
Top View
8.3_ (0.325)
Probe Location for measuring airflow and ambient temperature
Air flow
Bottom View
Tref
Figure 34. 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 at different local ambient temperature (TA) for airflow conditions ranging from natural convection and up to 2m/s (400 ft./min) are shown in the Characteristics Curves section.
Air Flow
Figure 33. Tref Temperature measurement location.
The thermal reference point, Tref used in the specifications is shown in Figure 33. For reliable o operation this temperature should not exceed 115 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 January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A 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.)
PIN
FUNCTION
1 2 3 4 5 6
On/Off VIN GND VOUT Trim Sense*
* Remote sense feature is a customer specified option (code suffix "3")
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A 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 2 3 4 5 6
On/Off VIN GND VOUT Trim Sense*
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Packaging Details
The Austin LynxTM SMT version is supplied in tape & reel as standard. Modules are shipped in quantities of 400 modules per reel.
All Dimensions are in millimeters and (in inches).
Reel Dimensions
Outside diameter: Inside diameter: Tape Width: 330.2 mm (13.00) 177.8 mm (7.00") 44.0 mm (1.73")
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Surface Mount Information
Pick and Place
The Austin Lynx 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 temperatures of up to 300oC. 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
Tlim above 205oC
50
0
Figure 35. Pick and place Location.
REFLOW TIME (S)
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 12 mm max.
Figure 35. 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 LynxTM 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 o o 235 C. Typically, the eutectic solder melts at 183 C,
Figure 36. Time Limit Curve Above 205 C Reflow for Tin Lead (Sn/Pb) process.
o
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Surface Mount Information (continued)
Lead Free Soldering
The -Z version Austin Lynx Programmable 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.
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 Modules: Soldering and Cleaning Application Note (AN04-001).
Pb-free Reflow Profile
Power Systems will comply with J-STD-020 Rev. C (Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices) for both Pb-free solder profiles and MSL classification procedures. This standard provides a recommended forced-air-convection reflow profile based on the volume and thickness of the package (table 4-2). The suggested Pb-free solder paste is Sn/Ag/Cu (SAC). The recommended linear reflow profile using Sn/Ag/Cu solder is shown in Figure. 37.
Per J-STD-020 Rev. C 300 Peak Temp 250 Reflow Temp (C) Cooling Zone * Min. Time Above 235C Heating Zone *Time Above 217C
MSL Rating
The Austin Lynx Programmable SMT modules have a MSL rating of 1.
200 150 100 50 0
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
Reflow Time (Seconds)
Figure 37. Recommended linear reflow profile using Sn/Ag/Cu solder.
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Data Sheet January 20, 2009
Austin LynxTM SMT Non-isolated Power Modules: 3.0 - 5.5Vdc Input; 0.75Vdc to 3.63Vdc Output; 10A output current
Ordering Information
Please contact your Lineage Power Sales Representative for pricing, availability and optional features. Table 2. Device Codes Device Code AXH010A0X-SR AXH010A0X-SRZ AXH010A0X3-SR* AXH010A0X3-SRZ* Input Voltage Range 3.0 - 5.5Vdc 3.0 - 5.5Vdc 3.0 - 5.5Vdc 3.0 - 5.5Vdc Output Voltage 0.75 - 3.63Vdc 0.75 - 3.63Vdc 0.75 - 3.63Vdc 0.75 - 3.63Vdc Output Current 10 A 10 A 10 A 10 A Efficiency 3.3V@ 10A 95.0% 95.0% 95.0% 95.0% Connector Type SMT SMT SMT SMT Comcodes 108992021 CC109104948 108992038 CC109104931
* Remote sense feature is active and pin 6 is added with code suffix "3" * -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: DS04-031 ver. 1.54 PDF name: lynx_po_smt.pdf

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