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Rohm BD9F800MUX-EVK-001 User Manual

Switching regulator, 1ch buck converter with integrated fet bd9f800mux evk
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Switching Regulator Series
1ch Buck Converter with Integrated FET
BD9F800MUX EVK
BD9F800MUX-EVK-001 (12V to 1V, 8A)
Introduction
This user's guide describes the steps required to operate the EVK of BD9F800MUX. The document includes a
description of the peripheral components, operating instructions, and reference data.
Description
BD9F800MUX-EVK-001 uses BD9F800MUX to output 1V from a 12V input voltage. The input voltage of the
BD9F800MUX is from 4.5V to 28V and the output voltage is configurable from 0.765V to 13.5V with external
resistors. The switching frequency can be selected as 300 kHz or 600 kHz. BD9F800MUX is a constant on-time
controlled DC/DC converter with fast transient response and does not require external phase compensation circuit.
It includes built-in soft start function for start-up rush current protection, Under Voltage Lock Out (UVLO),
Thermal Shutdown Detection (TSD), Over Current Protection (OCP), and Short Circuit Protection (SCP).
Application
Step-down power supplies for DSPs, microprocessors, etc.
Set-top box
Liquid crystal TV
DVD/Blu-ray player/recorder
Amusement equipment
© 2020 ROHM Co., Ltd.
1/10
User's Guide
No. 63UG048E Rev.001
2020.10

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Summary of Contents for Rohm BD9F800MUX-EVK-001

  • Page 1 Description BD9F800MUX-EVK-001 uses BD9F800MUX to output 1V from a 12V input voltage. The input voltage of the BD9F800MUX is from 4.5V to 28V and the output voltage is configurable from 0.765V to 13.5V with external resistors.
  • Page 2 Output Voltage Maximum Output Current Switching Frequency Maximum Efficiency Io = 2A UVLO Threshold Voltage VIN sweep up UVLO Hysteresis Voltage EVK Overview Figure 1. BD9F800MUX-EVK-001(Top View) Figure 2.BD9F800MUX-EVK-001(Bottom View) © 2020 ROHM Co., Ltd. No. 63UG048E Rev.001 2/10 2020.10...

  • Page 3: Operating Procedure

    BD9F800MUX-EVK-001 User’s Guide EVK Schematic Figure 3. BD9F800MUX-EVK-001 Schematic Operating Procedure 1. Turn off the DC power supply and connect the GND terminal of the power supply to the PGND pin of TB1. 2. Connect the VCC terminal of the DC power supply to the VIN pin of EVK TB1.
  • Page 4 300 kHz. When changing the operating frequency, it is necessary to change the parts. Table 2．Switching Frequency Setting FREQ Pin Voltage Switching Frequency HIGH (≥ 2.2 V) 600kHz LOW (≤ 0.8 V) 300kHz © 2020 ROHM Co., Ltd. No. 63UG048E Rev.001 4/10 2020.10...

  • Page 5: Parts List

    ROHM 1005 Open Resistor 10kΩ 50V, ±1%, 1/16W MCR01MZPF1002 ROHM 1005 Resistor 0Ω Jumper MCR01MZPJ000 ROHM 1005 Resistor 0Ω Jumper MCR01MZPJ000 ROHM 1005 Resistor 0Ω Jumper MCR01MZPJ000 ROHM 1005 Open © 2020 ROHM Co., Ltd. No. 63UG048E Rev.001 5/10 2020.10...
  • Page 6 1oz (35μm) *Middle Layers Figure 4. Top Layer Layout Figure 5. Middle1 Layer Layout (Top View) (Top View) Figure 6. Middle2 Layer Layout Figure 7. Bottom Layer Layout (Top View) (Top View) © 2020 ROHM Co., Ltd. No. 63UG048E Rev.001 6/10 2020.10...
  • Page 7 Figure 8. Current Consumption vs VIN Figure 9. Shutdown Current vs VIN (IO = 0mA) (EN=GND) 1.04 1.02 0.98 0.96 IOUT [A] VIN [V] Figure 10. Line Regulation Figure 11. Load Regulation (IO = 0mA) © 2020 ROHM Co., Ltd. No. 63UG048E Rev.001 7/10 2020.10...
  • Page 8 Figure 12. Switching Frequency vs VIN Figure 13. Efficiency vs Load Current (IO = 1A) VOUT: 0.05V/div (Offset = 1V) IOUT: 2A/div Figure 14. Load Response Figure 15. Frequency Response (IO = 8A) © 2020 ROHM Co., Ltd. No. 63UG048E Rev.001 8/10 2020.10...
  • Page 9 VIN: 10V/div VIN: 10V/div SW: 10V/div SW: 10V/div VOUT: 0.5V/div VOUT: 0.5V/div PGD: 5V/div PGD: 5V/div Figure 16. Start Up Waveform Figure 17. Shutdown Waveform (IO = 1A) (IO = 1A) © 2020 ROHM Co., Ltd. No. 63UG048E Rev.001 9/10 2020.10...

  • Page 10: Revision History

    BD9F800MUX-EVK-001 User’s Guide Revision History Revision Date Description Number 2020.10. 2 Initial release © 2020 ROHM Co., Ltd. No. 63UG048E Rev.001 10/10 2020.10...

  • Page 11: Data Sheet

    1. Before you use our Products, you are requested to carefully read this document and fully understand its contents. ROHM shall not be in any way responsible or liable for failure, malfunction or accident arising from the use of any ROHM’s Products against warning, caution or note contained in this document.