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| Technical Reference Notes APC18T04 Series APC18T04 Series: 3.0-5.5Vin / 18A Non-Isolated Point-of-Load The APC18 DC-DC Power Module is a high efficiency non-isolated buck converter designed for use in a wide variety of applications. Packaged in an industry standard recognized SMT footprint: 1.3" x 0.53", it works from a wide input voltage range of 3V to 5.5V and offers a wide adjustable output range of 0.75V to 3.3V through external resistor programming. Electrical Parameters Input Input Range Input Surge 3V to 5.5VDC 6V / 100ms Control Enable TTL compatible (Positive or Negative Logic Enable Options) Output Special Features * * * * * * * * Industry Standard SMT Footprint High Efficiency up to 95% at 3.3V output Adjustable output through external resistor programming Low output ripple and noise Input UVLO Fixed Switching Frequency Positive Enable Remote Sense pin Load Current Line/Load Regulation Ripple and Noise Output Voltage Adjust Range Transient Response Up to 18A max (Po 60W) < 0.5% VO 50mVP-P max 0.75 -3.3VO 300mV deviation (typical) 50% load change 25s settling time (typical) +10%VO 150% IO 120 C max Remote Sense Over Current Protection Over Temperature Protection Environmental Specifications * * * -40C to 85C Operating Temperature -40C to 125C Storage Temperature MTBF > 1 million hours Safety UL + cUL 60950, Recognized EN60950 through TUV-PS MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 1 OF 13 Technical Reference Notes APC18T04 Series Electrical Specifications ABSOLUTE MAXIMUM RATINGS Stresses in excess of the absolute maximum ratings can cause permanent damage to the converter. Functional operation of the device is converter is not implied at these or any other conditions in excess of those given in the operational section of the specs. Exposure to absolute maximum ratings for extended period can adversely affect device reliability. Parameter Input Voltage Continuous Transient (100ms) Isolation Voltage Input to Output Operating Temperature Storage Temperature Operating Humidity Max Voltage at Enable Pin Max Output Power Device All All All All All All Symbol VIN VIN, trans Ta TSTG - Min NA -40 -40 10 - Typ - Max 6 85 125 85 15 60 Unit Vdc C C % Vdc W INPUT SPECIFICATION Parameter Operating Input Voltage Range Input Under-Voltage Lock-out T_ON Threshold T_OFF Threshold Input Current1 (VIN = VIN, Min; IO = IO, Max) Max Pdiss @ IO = 0A (VIN = VIN, Nom) Input Ripple Current2 5Hz to 20MHz Inrush Transient Device All All All 3.3Vo 0.75Vo All All IIN-MAX Symbol VIN Min 3.0 2.7 2.4 Typ 3.3 / 5.0 2.9 2.6 100 Max 5.5 3.0 2.7 18 0.8 0.5 150 0.1 Unit Vdc Vdc A W mAp-p A2s II1 I2t MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 2 OF 13 Technical Reference Notes APC18T04 Series Electrical Specifications (continued) OUTPUT SPECIFICATIONS Parameter Output Voltage Set point VIN = VIN, MIN to VIN,MAX; IO =IO,Max Output Regulation Line: VIN = VIN, min to VIN, max Load: IO = IO, min to IO, max Temp: TA = -40 C to +85C Ripple and Noise3 Peak-to-Peak: (5Hz to 20MHz) Output Current4 External Load Capacitance Cap ESR 1 m Cap ESR 10 m Output Current-limit Inception5 (AVG. PCB TEMP, measured at R11 location) Device Symbol VO,SET Min 0.74 Typ 0.75 Max 0.76 Unit Vdc All All All All All All All All 0.75V 1.20V 1.50V 1.80V 2.50V 3.30V All All All All IO 0 15 25 - 0.5 30 0.5 50 18 1000 5000 250 120 6 14 350 2 -0.5 % mV % mVp-p A F F %Io C % % % % % % ms ms kHz %Vo V IO 100 80 85 87 88 91 93 250 - 150 110 82 87 89 90 92.5 95 3 300 - Over Temperature Range5 Efficiency VIN = 5VIN-NOM, IO = IO,MAX ; TA=25C, 200LFM Output voltage rise time VIN = VIN-MIN to VIN-MAX Enable to Output Turn-ON Delay VIN = VIN-MIN to VIN-MAX IO = IO,MIN to IO,MAX Switching Frequency Output Turn-on Overshoot Output Turn-off undershoot (Passive Resistive Full Load) Output Enable ON/OFF Positive Enable Enable Pin Voltage: Mod-ON Mod-OFF All - 2.4 0 - 15 0.8 V V MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 3 OF 13 Technical Reference Notes APC18T04 Series Electrical Specifications (continued) OUTPUT SPECIFICATIONS Parameter Dynamic Response (CO = 10uF Tantalum + 1uF Ceramic) Load Change of 50% step anywhere between 10% to 100% of rated load Peak Deviation Settling Time to VO, Nom <5% Peak deviation Dynamic Response (CO = 150uF x2 Special Polymer Aluminum Capacitors) Load Change of 50% step anywhere between 10% to 100% of rated load Peak Deviation Settling Time to VO, Nom <5% Peak deviation Output Voltage Trim Range6 Remote Sense NOTE: 1. 2. 3. 4. Device IO/t Symbol Min Typ 2.5 Max Unit A/s All IO/t - - 300 25 2.5 350 50 mV s A/s All All All 0.75 150 150 - 200 200 3.63 10% mV s V V The converter is not internally fused. External input capacitance required. See Figure 1. Refer to Appendix A3 for the output ripple and Noise Test Measurement Setup. Output current limited by 60W/Vo. Output Power Derating applies at elevated temperature. See Thermal Derating Curves. 5. OCP and OTP are in hiccup mode. The converter will auto restart once the fault is removed. 6. The voltage difference between input and output must be greater than 0.7V. MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 4 OF 13 Technical Reference Notes APC18T04 Series Electrical Specifications (continued) SAFETY AGENCY / MATERIAL RATING / ISOLATION Parameter Safety Approval Material Flammability Rating Input to Output Insulation Type Device All All All UL/cUL 60950, Flammability and Temperature Rise, TUV EN 60950 UL94V-0 Non-Isolated Figure 1. Input Reflected-ripple Test Set-up Measure input reflected current with a simulated source inductance L1 of 1uH. Capacitor Cin offsets possible battery impedance. Measure current as shown above. Figure 2. Peak-to-Peak Output Noise Measurement Test Set-up Note: (1) Use C1 = 1uF@50V X7R ceramic capacitor and a 10uF@10V tantalum capacitor. (2) Use C2 = 2 x 150uF/6.3V special polymer (Panasonic: EEFUE0J151R) (3) Scope measurement should be made using a BNC socket. MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 5 OF 13 Technical Reference Notes APC18T04 Series Typical Application Circuit Figure 3. Typical Application Circuit Input Capacitors: C1, C2: 100uF/16V Tantalum (Panasonic: EEFUE0K101R) C3: 2.2uF/6.3V Ceramic Output Capacitors: C4, C5: 150uF/6.3V special polymer (Panasonic: EEFUE0J151R) C6: 1uF/6.3V ceramic Enable Pin The converter comes with an Enable pin primarily used to turn ON/OFF the converter. The converter is disabled (OFF) when the voltage across the Enable pin and ground is between 0V to 0.8V. The converter is Enabled (ON) when the voltage across the Enable pin and ground is between 2.4V to 15V (or the Enable Pin is left open). Output Trim Output voltage adjustment is accomplished by connecting an external resistor between the Trim Pin and Ground Pin terminals. Resistance and Output voltage relationship is established by Equation 1. If Trim pin is left open - default VO = 0.75V TRIM-UP EQUATION: (1) Where Rtrim is the resistance value in ohms and VO in Volts is the output voltage desired. Table Rtrim values for different output voltage adjustment Vo (V) Rtrim (K) from Equation (1) Rtrim (K) from E96 0.75 open open 1.2 41.97K 42.2K 1.5 23.08K 23.2K 1.8 15K 15K 2.1 10.53K 10.50K 2.5 6.95K 6.98K 3.3 3.16K 3.16K MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 6 OF 13 Technical Reference Notes APC18T04 Series Performance Curves Efficiency vs. Output Current, 0.75Vout 95% 90% 85% Efficiency [%] 80% 75% 70% 65% 60% 55% 0 3 6 9 12 Output Current [A] 15 18 Vin = 3.0Vdc Vin = 3.3Vdc Vin = 5.5Vdc Pow er Dissipation vs. Output Current, 0.75Vout 5 4 Power Dissipation [W] 3 2 Vin = 3.0Vdc Vin = 3.3Vdc Vin = 5.5Vdc 1 0 0 3 6 9 12 Output Current [A] 15 18 Figure 4. Efficiency vs. Load Current at ambient temperature, TA = 25C. Figure 5. Power Dissipation vs. Load Current at ambient temperature, TA = 25C. Efficiency vs. Output Current, 2.5Vout 95% Power Dissipation [W] Pow er Dissipation vs. Output Current, 2.5Vout 5 90% Efficiecny [%] 85% 80% 75% 70% 65% 60% 55% 0 3 6 9 12 Output Current [A] 15 18 Vin = 3.0Vdc Vin = 3.3Vdc Vin = 5.5Vdc 4 3 2 Vin = 3.0Vdc 1 0 0 3 6 9 12 Output Current [A] Vin = 3.3Vdc Vin = 5.5Vdc 15 18 Figure 6. Efficiency vs. Load Current at ambient temperature, TA = 25C. Figure 7. Power Dissipation vs. Load Current at ambient temperature, TA = 25C MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 7 OF 13 Technical Reference Notes APC18T04 Series Performance Curves (continued) Efficiency vs. Output Current, 3.3Vout 95% Power Dissipation [W] Pow er Dissipation vs. Output Current, 3.3Vout 5 4 90% Efficiecny [%] 85% 80% 75% 70% 65% 60% 55% 0 3 6 9 12 Output Current [A] 15 18 Vin = 5.0Vdc Vin = 5.5Vdc 3 2 1 0 0 3 6 9 12 Output Current [A] Vin = 5.0Vdc Vin = 5.5Vdc 15 18 Figure 8. Efficiency vs. Load Current at ambient temperature, TA = 25C. Figure 9. Power Dissipation vs. Load Current at ambient temperature, TA = 25C APC18T04 @ 3.0 Vin 20 Output Current (A) Output Current (A) 20 15 10 5 0 APC18T04 @ 5.0 Vin 15 10 5 0 65 70 75 80 Ambient Temperature (C) 85 0 LFM 1 LFM 00 200 LFM 300 LFM 400 LFM 0 LFM 100 LFM 200 LFM 300 LFM 400 LFM 65 70 75 80 Ambient Temp (C) 85 Figure 10. Output Power Derating Curve for 0.75VOUT at VIN = 3V, TA = 25C Figure 11. Output Power Derating Curve for 0.75VOUT at VIN = 5V, TA = 25C MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 8 OF 13 Technical Reference Notes APC18T04 Series Performance Curves (continued) APC18T04 @ 5.0 Vin 20 Output Current (A) 15 10 5 0 65 70 75 80 Ambient Temp (C) 85 APC18T04 @ 5.0 Vin 20 Output Current (A) 15 10 5 0 65 70 75 Ambient Temp (C) 80 85 0 LFM 100 LFM 200 LFM 300 LFM 400 LFM 0 LFM 100 LFM 200 LFM 300 LFM 400 LFM Figure 12. Output Power Derating Curve for 1.5VOUT at VIN = 5V, TA = 25C Figure 13. Output Power Derating Curve for 1.8VOUT at VIN = 5V, TA = 25C APC18T04 @ 5.0 Vin 20 Output Current (A) APC18T04 @ 5.0 Vin 20 Output Current (A) 15 10 5 0 0 LFM 1 LFM 00 200 LFM 300 LFM 400 LFM 15 10 5 0 65 70 75 Ambient Temp (C) 80 85 0 LFM 1 LFM 00 200 LFM 300 LFM 400 LFM 65 70 75 Ambient Temp (C) 80 85 Figure 14. Output Power Derating Curve for 2.5VOUT at VIN = 5V, TA = 25C Figure 15. Output Power Derating Curve for 3.3VOUT at VIN = 5V, TA = 25C MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 9 OF 13 Technical Reference Notes APC18T04 Series Performance Curves (continued) Figure 16. Output Startup Waveform for 0.75VOUT at VIN = 5V, IOUT = 18A. Figure 17. Output Startup Waveform for 3.3VOUT at VIN = 5V, IOUT = 18A. Figure 18. 2V5 Output Ripple Waveform at Vin = 3V, Iout = 18A, TA = 25C. Figure 19. 2V5 Output Ripple Waveform at Vin = 3.3V, Iout = 18A, TA = 25C. MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 10 OF 13 Technical Reference Notes APC18T04 Series Performance Curves (continued) Figure 20. 2V5 Output Ripple Waveform at Vin = 5.5V, Iout = 18A, TA = 25C. Figure 21. 2V5 Output Enable Turn On Characteristic at at Vin = 3.3V, TA = 25C. Figure 22. 2V5 Output Transient Response (100% to 50%Iomax) at Vin = 3.3V, TA = 25C. Figure 23. 2V5 Output Transient Response (50% to 100%Iomax) at Vin = 3.3V, TA = 25C. MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 11 OF 13 Technical Reference Notes APC18T04 Series Mechanical Specifications Parameter Dimension Device All Symbol L W H Min Typ 5.8 [0.21] SENSE TRIM ENABLE Max 1.3 [33.02] 0.53 [13.46] 0.33 [8.33] Unit in [ mm ] in [ mm ] in [ mm ] g [oz] Weight PIN DESIGNATION VIN GND VO All +Input Voltage Return for VIN and VO +Output +Output Sense Pin VO Adjust ON/OFF Figure 24. Mechanical Outline MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 12 OF 13 Technical Reference Notes APC18T04 Series RECOMMENDED LOCATION FOR PICK AND PLACE The flat top surface of the large inductor (topside of the board) provides a versatile and convenient way of picking up the module (See Figure 25). A 6-7mm outside diameter nozzle from a conventional SMD machine is recommended to attain maximum vacuum pick-up. Nozzle travel and rotation speed should be controlled to prevent this off-centered picked-up module from falling off the nozzle. The use of vision recognition systems for placement accuracy will be very helpful. Figure 25. Pick-up location REFLOW NOTES / RECOMMENDATIONS 240 RECOMMENDED REFLOW PROFILE 220 200 1. 2. 3. Refer to the recommended Reflow Profile per Figure 26. Profile parameters exceeding the recommended maximums may result to permanent damage to the module. The module is recommended for topside reflow process to the host card. For other orientations, contact factory. In the event that the module needs to be desoldered from the host card, some pins may be detached from the module. TEMPERATURE (deg C) 180 160 140 120 100 80 60 40 20 0 0 183C PEAK TEMPERATURE 200C - 230C REFLOW ZONE 110C < 80 sec PRE-HEAT ZONE 120 - 180 sec SLOPE < 4C /sec 30 60 90 120 150 180 210 240 270 300 TIME (seconds) Figure 26. Recommended Reflow profile. PART NUMBERING SCHEME O/P CURRENT O/P VOLTAGE I/P Voltage OPTIONS APC 18 18 = 18A T T = 0.75 - 3.3V 04 04 = 3.0 - 5.5V - 9 9 = output adjust (J) J = Tray packaging Non "J" = T&R packaging Please call 1-888-41-ASTEC for further inquiries or visit us at www.astecpower.com MODEL: APC18T04 SERIES JULY 27, 2005 - REVISION A SHEET 13 OF 13 |
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