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International Rectifier SupIRBuck IR3898, User Manual, Page: 5 / 17

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International Rectifier SupIRBuck IR3898 User Manual Download Page 5

IRDC3898-P3V3 

8/15/2013 

 
 
 
 
 

                                                        

Confidential 

 

This evaluation board is a preliminary version meant for the engineering evaluation of the  IR3898. 
Based on the results of the continuing evaluation, this board  can evolve and change without notice 

5

 

Fig. 5:  Board Layout-Mid Layer 2

 

Fig. 4:  Board Layout-Mid Layer 1

 

Summary of Contents for SupIRBuck IR3898

Page 1: ...nder voltage lockout for proper start up enhanced line load regulation with feed forward external frequency synchronization with smooth clocking internal LDO and pre bias start up Pulse by pulse curre...

Page 2: ...to be connected to ground use zero ohm resistor for R21 The value of R14 and R28 can be selected to provide the desired tracking ratio between output voltage and the tracking input CONNECTIONS and OP...

Page 3: ...neering evaluation of the IR3898 Based on the results of the continuing evaluation this board can evolve and change without notice 3 Connection Diagram Vin Gnd Gnd Vout Enable VDDQ Vref Sync S Ctrl AG...

Page 4: ...nary version meant for the engineering evaluation of the IR3898 Based on the results of the continuing evaluation this board can evolve and change without notice 4 Fig 2 Board Layout Top Layer Fig 3 B...

Page 5: ...tion board is a preliminary version meant for the engineering evaluation of the IR3898 Based on the results of the continuing evaluation this board can evolve and change without notice 5 Fig 5 Board L...

Page 6: ...evaluation board is a preliminary version meant for the engineering evaluation of the IR3898 Based on the results of the continuing evaluation this board can evolve and change without notice 6 Fig 6...

Page 7: ...1 C23 2 2uF 0603 16V X5R 20 TDK C1608X5R1C225M 8 1 C26 5 6nF 0603 25V X7R 10 Murata GRM188R71E562KA01J 9 1 C32 1 0uF 0603 25V X5R 10 Murata GRM188R61E105KA12D 10 1 L1 1 0uH SMD 7 1x6 5x5mm 4 7m TDK S...

Page 8: ...change without notice 8 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 3 3V Io 0 6A Room Temperature no airflow Fig 10 Output Voltage Ripple 6A load Ch1 Vo Fig 11 Inductor node at 6A load Ch1 LX Fig 12 Sho...

Page 9: ...ant for the engineering evaluation of the IR3898 Based on the results of the continuing evaluation this board can evolve and change without notice 9 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 3 3V Io 0...

Page 10: ...ngineering evaluation of the IR3898 Based on the results of the continuing evaluation this board can evolve and change without notice 10 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 3 3V Io 0 6A Room Temp...

Page 11: ...the IR3898 Based on the results of the continuing evaluation this board can evolve and change without notice 11 TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 3 3V Io 0 6A Room Temperature no air flow Fig...

Page 12: ...change without notice 12 Fig 18 Power loss versus load current Fig 17 Efficiency versus load current TYPICAL OPERATING WAVEFORMS Vin 12 0V Vo 3 3V Io 0 6A Room Temperature no air flow 85 86 87 88 89...

Page 13: ...ng evaluation of the IR3898 Based on the results of the continuing evaluation this board can evolve and change without notice 13 THERMAL IMAGES Vin 12 0V Vo 3 3V Io 0 6A Room Temperature No Air flow F...

Page 14: ...performance is achieved using the substrate PCB layout as shown in following figures PQFN devices should be placed to an accuracy of 0 050mm on both X and Y axes Self centering behavior is highly depe...

Page 15: ...MD pads the underlying copper traces should be at least 0 05mm larger on each edge than the Solder Mask window in order to accommodate any layer to layer misalignment i e 0 1mm in X Y However for the...

Page 16: ...00 0 250mm 0 004 0 010 Stencils thinner than 0 100mm are unsuitable because they deposit insufficient solder paste to make good solder joints with the ground pad high reductions sometimes create simil...

Page 17: ...s board can evolve and change without notice 17 IR WORLD HEADQUARTERS 233 Kansas St El Segundo California 90245 USA Tel 310 252 7105 TAC Fax 310 252 7903 This product has been designed and qualified f...

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