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User’s  Guide 

BD9B305QUZ-EVK-001 

© 2020 ROHM Co., Ltd.

 

No.  63UG064E  Rev.  002

 

Apr.  2022

 

Revision History 

 

Date 

Revision Number 

Description 

10

th

, Aug. 2020 

001 

Initial release 

12

th

, Apr. 2022 

002 

p.3 Update part number of L1 and C6 in table 2 

p.5 Update figure 8, 9, 10, 11 

p.6 Update figure 12, 13, 14, 15, 16 

p.7 Add “Products listed in the Part list” and “Selection of Ceramic Capacitors” 

 

 

Summary of Contents for BD9B305QUZ-EVK-001

Page 1: ... Start circuit prevents inrush current during startup and its value can be adjusted by changing the capacitance value for SS pin There are a number of protection circuits present in this IC such as UVLO Under Voltage Lock Out TSD Thermal Shutdown Detection OCP Over Current Protection SCP Short Circuit Protection and OVP Over Voltage Protection and output discharge function which provide higher sys...

Page 2: ...M Co Ltd No 63UG064E Rev 002 Apr 2022 Figure 3 BD9B305QUZ EVK 001 Schematic EVK Overview Figure 1 BD9B305QUZ EVK 001 Top View Figure 2 BD9B305QUZ EVK 001 Bottom View EVK Schematic VIN 5V VOUT 1 8V 3A AGND is shorted with PGND at inner layers AGND ...

Page 3: ...f EN pin BD9B305QUZ selects the operating status as Table1 shows Table1 EN pin settings EN pin voltage BD9B305QUZ status High 0 965V Enabled Low 0 830V Shutdown BOM used in EVK Below is the table of the bill of materials of EVK Table2 Part list 1 8V output voltage setting Symbol Category Part Number Manufacturer Value Size mm inch Condition L1 Inductor FDSD0420 H 1R0M MURATA 1 0μH 4242 1717 C1 C5 ...

Page 4: ...d No 63UG064E Rev 002 Apr 2022 User s Guide BD9B305QUZ EVK 001 Board Layout EVK design information Figure 4 Top layer Top view Figure 6 Middle2 layer Top view Figure 7 Bottom layer Top view Figure 5 Middle1 layer Top view ...

Page 5: ...regulation VIN 3 3V 5V VOUT 1 8V Figure 10 Output ripple voltage VIN 5V IOUT 0 1A Figure 11 Output ripple voltage VIN 5V IOUT 3A 50 55 60 65 70 75 80 85 90 95 100 0 001 0 01 0 1 1 10 Efficiency IOUT A VIN 3 3V VIN 5V 1 780 1 785 1 790 1 795 1 800 1 805 1 810 1 815 1 820 0 0 5 1 1 5 2 2 5 3 VOUT V IOUT A VIN 3 3V VIN 5V VOUT 20mV div VOUT 20mV div SW 2V div SW 2V div 2μs div 2μs div ...

Page 6: ... 12 Transient response VIN 5V IOUT 0 1A to 1 0A Figure 13 Startup waveform VIN 5V IOUT No load Figure 14 Shutdown waveform VIN 5V IOUT No load VOUT 100mV div IOUT 500mA div 100μs div EN 3V div VIN 3V div VOUT 1V div PGD 5V div 400μs div EN 3V div VIN 3V div VOUT 1V div PGD 5V div 400μs div ...

Page 7: ...aracteristics and select the ones with actual capacitance are equivalent For reference figure 15 shows the DC bias characteristics of MLASA168BB5476MRCA01 TAIYO YUDEN listed in the part list C7 Actual capacitance degrades to 50 from the nominal value of 47μF under the condition of 1 8V output DC bias voltage is 1 8V When selecting an alternative component select the product that has same capacitan...

Page 8: ...evision History Date Revision Number Description 10th Aug 2020 001 Initial release 12th Apr 2022 002 p 3 Update part number of L1 and C6 in table 2 p 5 Update figure 8 9 10 11 p 6 Update figure 12 13 14 15 16 p 7 Add Products listed in the Part list and Selection of Ceramic Capacitors ...

Page 9: ...uch technical information The Products specified in this document are not designed to be radiation tolerant For use of our Products in applications requiring a high degree of reliability as exemplified below please contact and consult with a ROHM representative transportation equipment i e cars ships trains primary communication equipment traffic lights fire crime prevention safety equipment medic...

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