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Rohm BD9B305QUZ-EVK-001 User Manual
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Rohm BD9B305QUZ-EVK-001 User Manual

1ch buck switching regulator
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Switching Regulator Series
1ch buck switching regulator
BD9B305QUZ EVK User's Guide
BD9B305QUZ-EVK-001 (5V input → 1.8V, 3A output)
Introduction
This user's guide will provide the necessary steps to operate BD9B305QUZ-EVK-001 and evaluate BD9B305QUZ, a 1-channel
Buck DC/DC converter. Component selection, operating procedures, and evaluation data are also included in this guide.
Description
This EVK was developed for the customers to evaluate ROHM's synchronous buck DC/DC converter, BD9B305QUZ.
The operating topology is on-time control and operating frequency is fixed to 1MHz which features fast transient response.
The IC supports Light Load Mode and an internal 50mΩ N-channel MOSFET for high-side and 40mΩ N-channel MOSFET for
low-side are integrated so that the total efficiency and thermal property get improved. The built-in Soft 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 system reliablity. Power Good function makes an easy sequence control in the system. The board is set in typical
condition and the component values are tuned for 1.8V output voltage setting.
Application
● Step-down Power Supply for SoC, FPGA
● Laptop PC / Tablet PC / Server
● LDC TV
● Storage Device (HDD / SSD)
● Printer, OA Equipment
● Distribution power supply / Secondary power supply
EVK Operating conditions
Parameter
Input Voltage
Output Voltage
Output Current
Operating Frequency
Maximum Efficiency
UVLO Detect Voltage
UVLO Release Voltage
Soft Start Time
© 2020 ROHM Co., Ltd.
Min
Typ
Max
2.7
5.5
1.8
3.0
1
92
2.450
2.550
1
1/8
User's Guide
Units
Conditions
V
V
VOUT=1.8V setting
A
MHz
VIN=5V, IOUT=1A
%
V
VIN sweep down
V
VIN sweep up
ms
SS pin is open
No. 63UG064E Rev. 002
Apr. 2022

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Summary of Contents for Rohm BD9B305QUZ-EVK-001

  • Page 1 BD9B305QUZ-EVK-001 (5V input → 1.8V, 3A output) Introduction This user’s guide will provide the necessary steps to operate BD9B305QUZ-EVK-001 and evaluate BD9B305QUZ, a 1-channel Buck DC/DC converter. Component selection, operating procedures, and evaluation data are also included in this guide.
  • Page 2 BD9B305QUZ-EVK-001 User’s Guide EVK Overview AGND Figure 1. BD9B305QUZ-EVK-001(Top View) Figure 2. BD9B305QUZ-EVK-001(Bottom View) EVK Schematic VOUT=1.8V/3A VIN=5V AGND is shorted with PGND at inner layers. Figure 3. BD9B305QUZ-EVK-001 Schematic © 2020 ROHM Co., Ltd. No. 63UG064E Rev. 002 Apr. 2022...

  • Page 3: Operating Procedure

    1005 / 0402 Resistor SHORT 100kΩ(1%, 1/16W) Resistor MCR01 series ROHM 1005 / 0402 100kΩ(1%, 1/16W) Resistor MCR01 series ROHM 1005 / 0402 Resistor SHORT Resistor EMPTY Resistor SHORT © 2020 ROHM Co., Ltd. No. 63UG064E Rev. 002 Apr. 2022...

  • Page 4: Board Layout

    Board Layout EVK design information Figure 5. Middle1 layer Figure 4. Top layer (Top view) (Top view) Figure 6. Middle2 layer Figure 7. Bottom layer (Top view) (Top view) © 2020 ROHM Co., Ltd. No. 63UG064E Rev. 002 Apr. 2022...
  • Page 5 (VIN=3.3V / 5V, VOUT=1.8V) (VIN=3.3V / 5V, VOUT=1.8V) VOUT: 20mV/div VOUT: 20mV/div SW: 2V/div SW: 2V/div 2μs/div 2μs/div Figure 10. Output ripple voltage Figure 11. Output ripple voltage (VIN=5V, IOUT=0.1A) (VIN=5V, IOUT=3A) © 2020 ROHM Co., Ltd. No. 63UG064E Rev. 002 Apr. 2022...
  • Page 6 VIN: 3V/div EN: 3V/div EN: 3V/div 400μs/div VOUT: 1V/div 400μs/div VOUT: 1V/div PGD: 5V/div PGD: 5V/div Figure 13. Startup waveform Figure 14. Shutdown waveform (VIN=5V, IOUT=No load) (VIN=5V, IOUT=No load) © 2020 ROHM Co., Ltd. No. 63UG064E Rev. 002 Apr. 2022...
  • Page 7 1.8V.) When selecting an alternative component, select the product that has same capacitance under 1.8V of DC bias voltage. (Please check with the capacitor manufacturer for the DC bias characteristics of ceramic capacitors.). Figure 15. MLASA168BB5476MRCA01(TAIYO YUDEN)) DC bias characteristics © 2020 ROHM Co., Ltd. No. 63UG064E Rev. 002 Apr. 2022...

  • Page 8: Revision History

    Update figure 8, 9, 10, 11 , Apr. 2022 p.6 Update figure 12, 13, 14, 15, 16 p.7 Add “Products listed in the Part list” and “Selection of Ceramic Capacitors” © 2020 ROHM Co., Ltd. No. 63UG064E Rev. 002 Apr. 2022...
  • Page 9 Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM or any other parties. ROHM shall have no responsibility whatsoever for any dispute arising out of the use of such technical information.