Data Sheet GE TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Module 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Features  Compliant to RoHS EU Directive 2011/65/EU (-Z RoHS Compliant versions)  Compliant to RoHS EU Directive 2011/65/EU under exemption 7b (Lead solder exemption). Exemption 7b will expire after June 1, 2016 at which time this product will no longer be RoHS compliant (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) Applications  Low output ripple and noise  High Reliability:  Distributed power architectures o  Intermediate bus voltage applications  Calculated MTBF = 19M hours at 25 C Full-load  Constant switching frequency (300 kHz)  Telecommunications equipment  Output voltage programmable from 0.75 Vdc to  Servers and storage applications 4.0Vdc via external resistor  Networking equipment  Line Regulation: 0.3% (typical)  Load Regulation: 0.4% (typical)  Temperature Regulation: 0.4 % (typical)  Remote On/Off  Output overcurrent protection (non-latching)  Wide operating temperature range (-40°C to 85°C) †  UL* 60950-1Recognized, CSA C22.2 No. 60950-1-03 ‡ Certified, and VDE 0805:2001-12 (EN60950-1) Licensed  ISO** 9001 and ISO 14001 certified manufacturing facilities Description TM The Austin MicroLynx 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 September 25, 2015 ©2015 General Electric Company. All rights reserved. GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –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 Input Voltage All V -0.3 5.8 Vdc IN Continuous Operating Ambient Temperature All T -40 85 °C A (see Thermal Considerations section) Storage Temperature All T -55 125 °C stg 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 V ≤ V – 0.5V V 3.0 5.8 Vdc O,set IN IN  Maximum Input Current All I 5.0 Adc IN,max (V = V to V , I =I V = 3.3Vdc) IN IN, min IN, max O O, max O,set Input No Load Current VO,set = 0.75 Vdc IIN,No load 20 mA (VIN = 5.0Vdc, IO = 0, module enabled) VO,set = 3.3Vdc IIN,No load 45 mA Input Stand-by Current All I 0.6 mA IN,stand-by (VIN = 5.0Vdc, module disabled) 2 2 Inrush Transient All I t 0.04 A s Input Reflected Ripple Current, peak-to-peak (5Hz to 20MHz, 1μH source impedance; VIN, min to VIN, All 35 mAp-p I = I ; See Test configuration section) max, O Omax Input Ripple Rejection (120Hz) All 30 dB CAUTION: This power module is not internally fused. An input line fuse must always be used. This power module can be used in a wide variety of applications, ranging from simple standalone operation to being part of a complex power architecture. To preserve maximum flexibility, internal fusing is not included, however, to achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a fast-acting fuse with a maximum rating of 6 A (see Safety Considerations section). Based on the information provided in this data sheet on inrush energy and maximum dc input current, the same type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s data sheet for further information. September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 2 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Electrical Specifications (continued) Parameter Device Symbol Min Typ Max Unit Output Voltage Set-point All V –2.0  +2.0 % V O, set O, set (VIN=IN, min, IO=IO, max, TA=25°C) Output Voltage All VO, set –3%  +3% % VO, set (Over all operating input voltage, resistive load, and temperature conditions until end of life) Adjustment Range All VO 0.7525 4.0 Vdc Selected by an external resistor Output Regulation Line (VIN=VIN, min to VIN, max) All  0.3 % VO, set Load (IO=IO, min to IO, max) All  0.4 % VO, set Temperature (Tref=TA, min to TA, max) All  0.4 % VO, set Output Ripple and Noise on nominal output (VIN=VIN, nom and IO=IO, min to IO, max Cout = 1μF ceramic//10μFtantalum capacitors) RMS (5Hz to 20MHz bandwidth) All  10 15 mVrms Peak-to-Peak (5Hz to 20MHz bandwidth) All  40 50 mVpk-pk External Capacitance ESR ≥ 1 mΩ All CO, max   1000 μF ESR ≥ 10 mΩ All CO, max   3000 μF Output Current All Io 0  5 Adc Output Current Limit Inception (Hiccup Mode ) All IO, lim  220  % Io Output Short-Circuit Current All IO, s/c  2  Adc (VO≤250mV) ( Hiccup Mode ) Efficiency V = 0.75Vdc η 79.0 % O,set VIN= VIN, nom, TA=25°C VO, set = 1.2Vdc η 85.0 % IO=IO, max , VO= VO,set 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 % Switching Frequency All f 300 kHz sw   Dynamic Load Response (dIo/dt=2.5A/µs; V = V ; T =25°C) All Vpk  130  mV IN IN, nom A Load Change from Io= 50% to 100% of Io,max; 1μF ceramic// 10 μF tantalum Peak Deviation Settling Time (Vo<10% peak deviation) All t  25  µs s (dIo/dt=2.5A/µs; V = V ; T =25°C) All V  130  mV IN IN, nom A pk Load Change from Io= 100% to 50%of Io,max: 1μF ceramic// 10 μF tantalum Peak Deviation Settling Time (Vo<10% peak deviation) All ts  25  µs September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 3 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Electrical Specifications (continued) Parameter Device Symbol Min Typ Max Unit Dynamic Load Response (dIo/dt=2.5A/µs; V V = V ; T =25°C) All Vpk  50  mV IN IN, nom A Load Change from Io= 50% to 100% of Io,max; Co = 2x150 μF polymer capacitors Peak Deviation Settling Time (Vo<10% peak deviation) All t  50  µs s (dIo/dt=2.5A/µs; V = V ; T =25°C) All V  50  mV IN IN, nom A pk Load Change from Io= 100% to 50%of Io,max: Co = 2x150 μF polymer capacitors Peak Deviation Settling Time (Vo<10% peak deviation) All ts  50  µs General Specifications Parameter Min Typ Max Unit Calculated MTBF (I =I , T =25°C) 19, 000,000 Hours O O, max A Weight  2.8 (0.1)  g (oz.) September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 4 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc 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 Device Symbol Min Typ Max Unit Remote On/Off Signal interface (V =V to V ; Open collector pnp or equivalent IN IN, min IN, max Compatible, Von/off signal referenced to GND See feature description section) Logic Low (On/Off Voltage pin open - Module ON) Von/Off All VIL ― ― 0.4 V Ion/Off All IIL ― ― 10 μA Logic High (Von/Off > 2.5V – Module Off) Von/Off All VIH ― ― V V IN Ion/off All IIH ― ― 1 mA Turn-On Delay and Rise Times o (IO=IO, max , VIN = VIN, nom, TA = 25 C, ) All Tdelay 3.9 msec Case 1: On/Off input is set to Logic Low (Module ON) and then input power is applied (delay from instant at which VIN =VIN, min until Vo=10% of Vo,set) All Tdelay 3.9 msec Case 2: Input power is applied for at least one second and then the On/Off input is set to logic Low (delay from instant at which Von/Off=0.3V until Vo=10% of Vo, set) All Trise ― 4.2 8.5 msec Output voltage Rise time (time for Vo to rise from 10% of Vo,set to 90% of Vo, set) 1 Output voltage overshoot – Startup ― % V O, set o I = I ; V = 3.0 to 5.8Vdc, T = 25 C O O, max IN A Overtemperature Protection All T 150 °C ref   (See Thermal Consideration section) Input Undervoltage Lockout Turn-on Threshold All 2.2 V   Turn-off Threshold All 2.0 V   September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 5 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Characteristic Curves TM The following figures provide typical characteristics for the Austin MicroLynx SMT modules at 25ºC. 88 95 85 90 82 85 79 Vin = 3.0V Vin = 3.0V 80 76 Vin = 5.0V Vin = 5.0V 75 73 Vin = 5.5V Vin = 5.5V 70 70 0 1 2 3 4 5 0 1 2 3 4 5 OUTPUT CURRENT, IO (A) OUTPUT CURRENT, IO (A) Figure 1. Converter Efficiency versus Output Current (Vout = Figure 4. Converter Efficiency versus Output Current (Vout = 0.75Vdc). 1.8Vdc). 95 100 95 90 90 85 85 Vin = 3.0V 80 Vin = 3.0V 80 Vin = 5.0V Vin = 5.0V 75 75 Vin = 5.5V Vin = 5.5V 70 70 0 1 2 3 4 5 0 1 2 3 4 5 OUTPUT CURRENT, I (A) OUTPUT CURRENT, I (A) O O Figure 2. Converter Efficiency versus Output Current (Vout = Figure 5. Converter Efficiency versus Output Current (Vout = 1.2Vdc). 2.5Vdc). 95 100 95 90 90 85 Vin = 3.0V 85 80 Vin = 4.5V 80 Vin = 5.0V Vin = 5.0V 75 75 Vin = 5.5V Vin = 5.5V 70 70 0 1 2 3 4 5 0 1 2 3 4 5 OUTPUT CURRENT, I (A) OUTPUT CURRENT, I (A) O O Figure3. Converter Efficiency versus Output Current (Vout = Figure 6. Converter Efficiency versus Output Current (Vout = 1.5Vdc). 3.3Vdc). September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 6 EFFICIENCY, η (%) EFFICIENCY, η (%) EFFICIENCY, η (%) EFFICIENCY, η (%) EFFICIENCY, η (%) EFFICIENCY, η (%) GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Characteristic Curves TM The following figures provide typical characteristics for the Austin MicroLynx SMT modules at 25ºC. 100 95 90 Vin=5.8V Vin=5.5V Vin=5.0V 85 80 75 70 0 1 2 3 4 5 OUTPUT CURRENT, IO (A) Figure 7. Converter Efficiency versus Output Current (Vout = 4.0Vdc). September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 7 EFFICIENCY, η (%) GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Characteristic Curves (continued) TM The following figures provide typical characteristics for the Austin MicroLynx SMT modules at 25ºC. 6 Io=0A 5 Io=2.5A 4 Io=5A 3 2 1 0 0.5 1.5 2.5 3.5 4.5 5.5 INPUT VOLTAGE, V (V) IN TIME, t (5 µs/div) Figure 8. Input voltage vs. Input Current Figure 11. Transient Response to Dynamic Load Change from 50% to 100% of full load (Vo = 3.3Vdc). (Vout = 2.5Vdc). TIME, t (2µs/div) TIME, t (5 µs/div) Figure 9. Typical Output Ripple and Noise Figure 12. Transient Response to Dynamic Load Change from 100% to 50% of full load (Vo = 3.3 Vdc). (Vin = 5.0V dc, Vo = 0.75 Vdc, Io=5A). TIME, t (2µs/div) TIME, t (10µs/div) Figure 10. Typical Output Ripple and Noise Figure 13. Transient Response to Dynamic Load Change from 50% to 100% of full load (Vo = 5.0 Vdc, Cext = 2x150 μF (Vin = 5.0V dc, Vo = 3.3 Vdc, Io=5A). Polymer Capacitors). September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 8 OUTPUT VOLTAGE OUTPUT VOLTAGE INPUT CURRENT, I (A) VO (V) (20mV/div) VO (V) (20mV/div) IN OUTPUT CURRENT, OUTPUT VOLTAGE OUTPUT CURRENT, OUTPUT VOLTAGE OUTPUT CURRENT, OUTPUT VOLTAGE I (A) (2A/div) V (V) (50mV/div) I (A) (2A/div) V (V) (100mV/div) I (A) (2A/div) V (V) (100mV/div) O O O O O O GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Characteristic Curves (continued) TM The following figures provide typical characteristics for the Austin MicroLynx SMT modules at 25ºC. TIME, t (2 ms/div) TIME, t (10µs/div) Figure 14. Transient Response to Dynamic Load Change Figure 17. Typical Start-Up with application of Vin from 100% of 50% full load (Vo = 5.0 Vdc, Cext = 2x150 μF (Vin = 5.0Vdc, Vo = 3.3Vdc, Io = 5A). Polymer Capacitors). TIME, t (2 ms/div) TIME, t (2 ms/div) Figure 15. Typical Start-Up Using Remote On/Off (Vin = Figure 18. Typical Start-Up Using Remote On/Off with Prebias 5.0Vdc, Vo = 3.3Vdc, Io = 5.0A). (Vin = 3.3Vdc, Vo = 1.8Vdc, Io = 1.0A, Vbias =1.0Vdc). TIME, t (2 ms/div) TIME, t (5ms/div) Figure 16. Typical Start-Up Using Remote On/Off with Low- Figure 19. Output short circuit Current (Vin = 5.0Vdc, Vo = ESR external capacitors (7x150uF Polymer) (Vin = 5.0Vdc, Vo 0.75Vdc). = 3.3Vdc, Io = 5.0A, Co = 1050µF). September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 9 OUTPUT VOLTAGE On/Off VOLTAGE OUTPUT VOLTAGE On/Off VOLTAGE OUTPUT CURRENT, OUTPUTVOLTAGE I O VOV) (1V/div) VOn/off (V) (2V/div) VOV) (1V/div) VOn/off (V) (2V/div) (A) (2A/div) VO (V) (50mV/div) OUTPUT CURRENT, OUTPUT VOLTAGE On/Off VOLTAGE OUTPUT VOLTAGE, INPUT VOLTAGE IO (A) (5A/div) VOV) (1V/div) VOn/off (V) (2V/div) Vo (V) (1V/div) VIN (V) (2V/div) GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Characteristic Curves (continued) TM The following figures provide thermal derating curves for the Austin MicroLynx SMT modules. 6 6 5 5 4 4 3 3 NC NC 2 2 0.5m/s (100 LFM) 0.5m/s (100 LFM) 1 1 1.0m/s (200 LFM) 1.0m/s (200 LFM) 0 0 20 30 40 50 60 70 80 90 20 30 40 50 60 70 80 90 O O AMBIENT TEMPERATURE, TA C AMBIENT TEMPERATURE, TA C Figure 20. Derating Output Current versus Local Ambient Figure 23. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 5.0, Vo=3.3Vdc). Temperature and Airflow (Vin = 3.3dc, Vo=0.75 Vdc). 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). 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, T C A Figure 22. Derating Output Current versus Local Ambient Temperature and Airflow (Vin = 3.3Vdc, Vo=2.5 Vdc). September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 10 OUTPUT CURRENT, Io (A) OUTPUT CURRENT, Io (A) OUTPUT CURRENT, Io (A) OUTPUT CURRENT, Io (A) GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Test Configurations Design Considerations Input Filtering CURRENT PROBE TO OSCILLOSCOPE TM The Austin MicroLynx SMT module should be connected to a L TEST low-impedance source. A highly inductive source can affect V (+) IN 1μH the stability of the module. An input capacitance must be placed directly adjacent to the input pin of the module, to C minimize input ripple voltage and ensure module stability. IN CS 1000μF Electrolytic 2x100μF E.S.R.<0.1Ω Tantalum @ 20°C 100kHz To minimize input voltage ripple, low-ESR polymer and ceramic COM capacitors are recommended at the input of the module. Figure 27 shows the input ripple voltage (mVp-p) for various outputs with 1x150 µF polymer capacitors (Panasonic p/n: NOTE: Measure input reflected ripple current with a simulated source inductance (L ) of 1μH. Capacitor C offsets TEST S EEFUE0J151R, Sanyo p/n: 6TPE150M) in parallel with 1 x 47 µF possible battery impedance. Measure current as shown ceramic capacitor (Panasonic p/n: ECJ-5YB0J476M, Taiyo- above. Yuden p/n: CEJMK432BJ476MMT) at full load. Figure 28 shows Figure 24. Input Reflected Ripple Current Test Setup. the input ripple with 2x150 µF polymer capacitors in parallel with 2 x 47 µF ceramic capacitor at full load. COPPER STRIP 120 V (+) RESISTIVE O LOAD 100 1uF . 10uF SCOPE 80 COM 60 GROUND PLANE 40 NOTE: All voltage measurements to be taken at the module terminals, as shown above. If sockets are used then Vin = 3.3V Kelvin connections are required at the module terminals 20 to avoid measurement errors due to socket contact resistance. Vin = 5.0V Figure 25. Output Ripple and Noise Test Setup. 0 0 1 2 3 4 Output Voltage (Vdc) Rdistribution Rcontact Rcontact Rdistribution V (+) V Figure 27. Input ripple voltage for various output with 1x150 IN O µF polymer and 1x47 µF ceramic capacitors at the input (full load). R LOAD V V IN O 120 100 R R R R distribution contact contact distribution COM COM 80 NOTE: All voltage measurements to be taken at the module 60 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 40 resistance. Vin = 3.3V 20 Figure 26. Output Voltage and Efficiency Test Setup. Vin = 5.0V 0 V . I O O 0 1 2 3 4 Efficiency = x 100 % η V . I IN IN 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). September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 11 BATTERY Input Ripple Voltage (mVp-p) Input Ripple Voltage (mVp-p) GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Design Considerations (continued) Safety Considerations For safety agency approval the power module must be Output Filtering installed in compliance with the spacing and separation TM The Austin MicroLynx SMT module is designed for low output requirements of the end-use safety agency standards, i.e., UL ripple voltage and will meet the maximum output ripple 60950-1, CSA C22.2 No. 60950-1-03, and VDE 0850:2001-12 specification with 1 µF ceramic and 10 µF tantalum capacitors (EN60950-1) Licensed. at the output of the module. However, additional output filtering may be required by the system designer for a number For the converter output to be considered meeting the of reasons. First, there may be a need to further reduce the requirements of safety extra-low voltage (SELV), the input must output ripple and noise of the module. Second, the dynamic meet SELV requirements. The power module has extra-low response characteristics may need to be customized to a voltage (ELV) outputs when all inputs are ELV. particular load step change. The input to these units is to be provided with a fast-acting fuse with a maximum rating of 6A in the positive input lead. 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. September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 12 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Feature Description Overcurrent Protection Remote On/Off To provide protection in a fault (output overload) condition, the TM The Austin MicroLynx SMT power modules feature an On/Off unit is equipped with internal current-limiting circuitry and can pin for remote On/Off operation of the module. If not using the endure current limiting continuously. At the point of remote On/Off pin, leave the pin open (module will be On). The current-limit inception, the unit enters hiccup mode. The unit On/Off pin signal (Von/Off) is referenced to ground. To switch operates normally once the output current is brought back into the module on and off using remote On/Off, connect an open its specified range. The typical average output current during collector pnp transistor between the On/Off pin and the VIN pin hiccup is 2A. (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 Input Undervoltage Lockout Von/off of the module is 0.4 V. The maximum allowable leakage At input voltages below the input undervoltage lockout limit, current of the transistor when Von/off = 0.4V and V = V is IN IN,max module operation is disabled. The module will begin to operate 10μA. During a logic-high when the transistor is in the active at an input voltage above the undervoltage lockout turn-on state, the power module is OFF. During this state VOn/Off = 2.5V threshold. to 5.8V and the maximum IOn/Off = 1mA. V (+) IN Lynx-Series Module Overtemperature Protection Q1 To provide over temperature protection in a fault condition, the I On/Off unit relies upon the thermal protection feature of the controller IC. The unit will shutdown if the thermal reference point Tref, On/Off o exceeds 150 C (typical), but the thermal shutdown is not Pin 20k Enable intended as a guarantee that the unit will survive temperatures beyond its rating. The module will automatically restart after it Css cools down. 14k GND F igure 29. Remote On/Off Implementation. Remote On/Off can also be implemented using open-collector 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 R pull-up I ON/OFF ON/OFF + PWM Enable V ON/OFF R1 Q2 CSS Q1 R2 GND _ Figure 30. Remote On/Off Implementation using logic-level devices and an external pull-up resistor. September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 13 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Feature Descriptions (continued) V (+) V (+) IN O Output Voltage Programming TM The output voltage of the Austin MicroLynx SMT can be programmed to any voltage from 0.75 Vdc to 4.0 Vdc by ON/OFF connecting a single resistor (shown as Rtrim in Figure 31) LOAD TRIM between the TRIM and GND pins of the module. Without an external resistor between TRIM pin and the ground, the output + V tri m voltage of the module is 0.75 Vdc. To calculate the value of the - GND resistor Rtrim for a particular output voltage Vo, use the following equation: 21070   Rtrim= − 5110Ω Figure 32. Circuit Configuration for programming Output   Vo− 0.7525   voltage using external voltage source. Table 1 provides Rtrim values required for some common For example, to program the output voltage of the Austin TM output voltages, while Table 2 provides values of the external MicroLynx module to 1.8 Vdc, Rtrim is calculated is follows: voltage source, Vtrim for the same common output voltages. 21070   Rtrim= − 5110   1.8− 0.7525   Table 1 Rtrim= 15.004kΩ V (V) Rtrim (KΩ) O, set 0.7525 Open Vout 1.2 41.973 V (+) V (+) IN O 1.5 23.077 1.8 15.004 ON/OFF 2.5 6.947 LOAD TRIM 3.3 3.160 R trim Table 2 GND V (V) Vtrim (V) O, set 0.7525 Open 1.2 0.6240 Figure 31. Circuit configuration for programming output voltage using an external resistor. 1.5 0.5731 1.8 0.5221 TM The Austin MicroLynx can also be programmed by applying a 2.5 0.4033 voltage between the TRIM and the GND pins (Figure 32). The 3.3 0.2674 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}) By using a 1% tolerance trim resistor, set point tolerance of TM For example, to program the output voltage of a MicroLynx ±2% is achieved as specified in the electrical specification. The module to 3.3 Vdc, Vtrim is calculated as follows: POL Programming Tool, available at www.gecriticalpower.com under the Design Tools section, helps determine the required Vtrim= (0.7− 0.1698×{3.3− 0.7525}) external trim resistor needed for a specific output voltage. Vtrim= 0.2670V September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 14 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Feature Description (continued) Voltage Margining Output voltage margining can be implemented in the Austin TM 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.gecriticalpower.com under the Design Tools section, also calculates the values of R and R for a specific output voltage and % margin-up margin-down margin. Please consult your local GE 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. September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 15 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current The thermal reference point, T used in the specifications is ref Thermal Considerations shown in Figure 34. For reliable operation this temperature Power modules operate in a variety of thermal environments; o should not exceed 115 C. 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 25.4_ reduction in the operating temperature of the module will result Wind Tunnel (1.0) 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 PWBs Power Module 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. 76.2_ (3.0) x Probe Loc ation for measuring 5.97_ airflow and (0.235) ambient temperature Air flow Figure 35. 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 temperatures (T ) for airflow conditions ranging A from natural convection and up to 1m/s (200 ft./min) are shown in the Characteristics Curves section. Figure 34. T Temperature measurement location. ref The output power of the module should not exceed the rated power of the module (Vo,set x Io,max). Please refer to the Application Note “Thermal Characterization Process For Open-Frame Board-Mounted Power Modules” for a detailed discussion of thermal aspects including maximum device temperatures. September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 16 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –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.) September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 17 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –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.) September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 18 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Packaging Details TM The Austin MicroLynx 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: 330.2 mm (13.00) Inside Dimensions: 177.8 mm (7.00”) Tape Width: 44.00 mm (1.732”) September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 19 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Surface Mount Information Pick and Place Reflow Soldering Information TM TM The Austin MicroLynx SMT modules use an open frame The Austin MicroLynx SMT power modules are large mass, construction and are designed for a fully automated low thermal resistance devices and typically heat up slower assembly process. The modules are fitted with a label than other SMT components. It is recommended that the designed to provide a large surface area for pick and place customer review data sheets in order to customize the operations. The label meets all the requirements for surface solder reflow profile for each application board assembly. mount processing, as well as safety standards, and is able to The following instructions must be observed when soldering o withstand reflow temperatures of up to 300 C. The label also these units. Failure to observe these instructions may result carries product information such as product code, serial in the failure of or cause damage to the modules, and can number and the location of manufacture. 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). Fi gure 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 Figure 37. Reflow Profile. diameter for reliable operation is 6mm. The maximum nozzle outer diameter, which will safely fit within the allowable component spacing, is 9 mm. An example of a reflow profile (using 63/37 solder) for the TM Austin MicroLynx SMT power module is : Oblong or oval nozzles up to 11 x 9 mm may also be used o • Pre-heating zone: room temperature to 183 C (2.0 to within the space available. 4.0 minutes maximum) o • Initial ramp rate < 2.5 C 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 September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 20 GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current use. Once the original package is broken, the floor life of Surface Mount Information (continued) the product at conditions of ≤ 30°C and 60% relative Lead Free Soldering humidity varies according to the MSL rating (see J-STD- 033A). The shelf life for dry packed SMT packages will be a The –Z version Austin MicroLynx SMT modules are lead-free minimum of 12 months from the bag seal date, when (Pb-free) and RoHS compliant and are both forward and stored at the following conditions: < 40° C, < 90% relative backward compatible in a Pb-free and a SnPb soldering humidity. 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. Post Solder Cleaning and Drying Considerations Post solder cleaning is usually the final circuit-board Pb-free Reflow Profile assembly process prior to electrical board testing. The result of inadequate cleaning and drying can affect both the Power Systems will comply with J-STD-020 Rev. C reliability of a power module and the testability of the (Moisture/Reflow Sensitivity Classification for Nonhermetic finished circuit-board assembly. For guidance on Solid State Surface Mount Devices) for both Pb-free solder appropriate soldering, cleaning and drying procedures, refer profiles and MSL classification procedures. This standard to Board Mounted Power Modules: Soldering and Cleaning provides a recommended forced-air-convection reflow Application Note (AN04-001). 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 300 Per J-STD-020 Rev. C using Sn/Ag/Cu solder is shown in Fig. 38. Peak Temp 260°C 250 MSL Rating Cooling 200 Zone * Min. Time Above 235°C 15 Seconds The Austin MicroLynx SMT modules have a MSL rating of 2a. 150 Heating Zone *Time Above 217°C 1°C/Second 60 Seconds Storage and Handling 100 50 The recommended storage environment and handling procedures for moisture-sensitive surface mount 0 packages is detailed in J-STD-033 Rev. A (Handling, Reflow Time (Seconds) Packing, Shipping and Use of Moisture/Reflow Sensitive Figure 38. Recommended linear reflow profile using Surface Mount Devices). Moisture barrier bags (MBB) with Sn/Ag/Cu solder. desiccant are required for MSL ratings of 2 or greater. These sealed packages should not be broken until time of September 25, 2015 ©2015 General Electric Company. All rights reserved. Page 21 Reflow Temp (°C) GE Data Sheet TM Austin MicroLynx 5A: Non-Isolated DC-DC Power Modules 3.0Vdc –5.8Vdc input; 0.75Vdc to 4.0Vdc output; 5A Output Current Ordering Information Please contact your GE Sales Representative for pricing, availability and optional features. Table 3. Device Codes Output Efficiency Connector Product codes Input Voltage Output Voltage Comcode Current 3.3V @ 5A Type 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 Contact Us For more information, call us at USA/Canada: +1 877 546 3243, or +1 972 244 9288 Asia-Pacific: +86.021.54279977*808 Europe, Middle-East and Africa: +49.89.878067-280 www.gecriticalpower.com GE Critical Power reserves the right to make changes to the product(s) or information contained herein without notice, and 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. September 25, 2015 ©2015 General Electric Company. All International rights reserved. Version 1.39