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Rohm BD9A100MUV User Manual
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Rohm BD9A100MUV User Manual

Step-down dc/dc converter
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Switching Regulator Series
Step-Down DC/DC Converter
BD9A100MUV Evaluation Board
BD9A100MUV-EVK-001
Description
This evaluation board has been developed for ROHM's synchronous buck DC/DC converter customers evaluating
BD9A100MUV. While accepting a power supply of 2.7-5.5V, an output of 1.8V can be produced. The IC has internal 60mΩ
high-side N-channel MOSFET and 60mΩ low-side N-channel MOSFET and a synchronization frequency is of 1MHz. A
Soft Start circuit prevents in-rush current during startup. An EN pin allows for simple ON/OFF control of the IC to reduce
standby current consumption. A MODE pin allows the user to select fixed frequency PWM mode or enables the Deep-SLLM
control and the mode is automatically switched between the Deep-SLLM control and fixed frequency PWM mode. Include
OCP (Over Current Protection) and SCP (Short Circuit Protection).
Evaluation Board Operating Limits and Absolute Maximum Ratings (Ta=25℃)
Parameter
Supply Voltage
Output Voltage /
Current
Evaluation Board
www.rohm.co.jp
© 2015 ROHM Co., Ltd. All rights reserved.
Symbol
MIN
V
2.7
CC
V
-
OUT
I
-
OUT
Figure 1. BD9A100MUV-EVK-001 Evaluation Board
Limit
Unit
TYP
MAX
-
5.5
V
1.8
-
V
-
1
A
1/9
Conditions
9 September 2015 Rev.002

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Summary of Contents for Rohm BD9A100MUV

  • Page 1 This evaluation board has been developed for ROHM’s synchronous buck DC/DC converter customers evaluating BD9A100MUV. While accepting a power supply of 2.7-5.5V, an output of 1.8V can be produced. The IC has internal 60mΩ high-side N-channel MOSFET and 60mΩ low-side N-channel MOSFET and a synchronization frequency is of 1MHz. A Soft Start circuit prevents in-rush current during startup.

  • Page 2: Operation Procedures

    It also can be swithed between standby-mode and normal-mode operation by removing Jumper-pin and controlling the voltage between EN and GND-terminal. Standby-mode is enabled when the voltage of EN is under 0.5V, and normal-mode operation when it is over 2.0V. www.rohm.co.jp 9 September 2015 Rev.002 © 2015 ROHM Co., Ltd. All rights reserved.

  • Page 3: Bill Of Materials

    J1, J2 Terminal Block 2 contacts, 15A, 14 to 22AWG TB111-2-2-U-1-1 Connectors & Cables Jumper Jumper pin for SW1 MJ254-6BK USECONN FR4, 4-layer, 1oz EVK029 Rev.A Tamukai 50×50×1.6 www.rohm.co.jp 9 September 2015 Rev.002 © 2015 ROHM Co., Ltd. All rights reserved.
  • Page 4 BD9A100MUV-EVK-001 Layout (PCB size: 50mm×50mm×1.6mm) Figure 4. Top Silk Screen (Top view) Figure 5. Top Silk Screen and Layout (Top view) www.rohm.co.jp 9 September 2015 Rev.002 © 2015 ROHM Co., Ltd. All rights reserved.
  • Page 5 BD9A100MUV-EVK-001 Figure 6. Top Side Layout (Top view) Figure 7. L2 Layout (Top view) www.rohm.co.jp 9 September 2015 Rev.002 © 2015 ROHM Co., Ltd. All rights reserved.
  • Page 6 BD9A100MUV-EVK-001 Figure 8. L3 Layout (Top view) Figure 9. Bottom Side Layout (Top view) www.rohm.co.jp 9 September 2015 Rev.002 © 2015 ROHM Co., Ltd. All rights reserved.
  • Page 7 (AC) 50mV/div -0.1 : 0A→1A→0A -0.2 : 0.5A/div -0.3 -0.4 -0.5 Time scale 1ms/div Load Current (A) Figure 13. Load Transient Characteristics Figure 12. Load Regulation www.rohm.co.jp 9 September 2015 Rev.002 © 2015 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp...
  • Page 8 Time scale 20ms/div Figure 15. Input Voltage Ripple Wave Figure 16. Input Voltage Ripple Wave = 5.0V, V = 1.8V, I = 5.0V, V = 1.8V, I www.rohm.co.jp 9 September 2015 Rev.002 © 2015 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp...
  • Page 9 Time scale 1ms/div Time scale 1ms/div Figure 20. Power-down by EN Figure 19. Start-up by EN = 5.0V, V = 1.8V = 5.0V, V = 1.8V www.rohm.co.jp 9 September 2015 Rev.002 © 2015 ROHM Co., Ltd. All rights reserved. www.rohm.co.jp...
  • Page 10 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.