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Switching Regulator Series
Buck Converter with Integrated FET
BD9B304QWZ EVK
BD9B304QWZ-EVK-001 (5.0V → 1.2V, 3.0A)
Introduction
This user's guide will provide the necessary steps to operate the EVK of ROHM's BD9B304QWZ 1channel Buck DC/DC converter.
This include the external parts, operating procedures and application data.
Description
This EVK was developed for ROHM's synchronous buck DC/DC converter BD9B304QWZ. The BD9B304QWZ accepts a power
supply input range of 2.7V to 5.5V, and generates an output voltage from 0.8V to 0.8 x V
in 40mΩ N-channel MOSFET for High side and Low Side that is operating frequency is 1.0MHz/2.0MHz selectable. It adopts a
Deep-SLLM compliant fixed on-time control method that consumes low current at light loads, making it ideal for equipment that
wants to reduce standby power consumption. It has a fixed 1ms soft start function to prevent rush current at startup, UVLO
(Under Voltage Lock Out), TSD (Thermal Shutdown Detection), OCP (Over Current Protection), SCP (Short Circuit Protection)
functions.
Application
Step-down power supply for DSP, FPGA, microprocessor, etc.
Laptop PC/Tablet PC/Server
LCD TV
Storage device (HDD/SSD)
Printers and OA equipment
Distribution power supply, secondary power supply
EVK Operating Limits
Parameter
Input Voltage
Output Voltage
Output Current Range
Operating Frequency
Maximum Efficiency
UVLO Detect Voltage
UVLO Release Voltage
© 2020 ROHM Co., Ltd.
Min
Typ
2.7
5.0
1.2
1.0
88
2.450
2.550
1/9
User's Guide
using external resistors. It has a built-
IN
Max
Units
5.5
V
V
3.0
A
By VIN applying to FREQ
MHz
pin.
%
I
= 1A
O
V
VIN sweep down
VIN sweep up
V
Conditions
No. 63UG041E Rev.001
AUG.2020
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Summary of Contents for Rohm BD9B304QWZ
- Page 1 BD9B304QWZ EVK BD9B304QWZ-EVK-001 (5.0V → 1.2V, 3.0A) Introduction This user’s guide will provide the necessary steps to operate the EVK of ROHM’s BD9B304QWZ 1channel Buck DC/DC converter. This include the external parts, operating procedures and application data. Description This EVK was developed for ROHM’s synchronous buck DC/DC converter BD9B304QWZ. The BD9B304QWZ accepts a power supply input range of 2.7V to 5.5V, and generates an output voltage from 0.8V to 0.8 x V...
- Page 2 User’s Guide EVK Overview BD9B304QWZ-EVK-001 Figure 1. BD9B304QWZ-EVK-001(Top View) ＊A 3 points switch implements on either SW_MODE and SW_IN on actual EVK. EVK Schematic FREQ BOOT Figure 2. BD9B304QWZ-EVK-001 Circuit Diagram © 2020 ROHM Co., Ltd. No. 63UG041E Rev.001 AUG.2020...
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Page 3: Operating Procedure
Turn on the DC power supply. Make sure the voltmeter shows 1.2V. Turn on the electronic load. (Caution) This EVK does not support hot plug. Do not perform hot plug test. © 2020 ROHM Co., Ltd. No. 63UG041E Rev.001 AUG.2020... -
Page 4: Operation Mode Settings
SW_EN switch EN Pin BD9B304QWZ Condition Enable Shutdown Operation Mode Settings Below is a table of BD9B304QWZ operation modes selectable using MODE pin via SW_MODE switch. Table 2. MODE Pin Settings SW_MODE switch MODE Pin BD9B304QWZ Operation Mode Forced PWM... -
Page 5: Board Layout
Material Board Size Copper Thickness FR-4 50mm x 40mm x 1.6mmt 1oz (35μm) The layout of BD9B304QWZ-EVK-001 is shown below. Figure 3. Top Layer Layout Figure 4. Middle1 Layer Layout (Top View) (Top View) Figure 5. Middle2 Layer Layout Figure 6. Bottom Layer Layout... - Page 6 User’s Guide Reference application data MODE=L MODE=H Figure 7. Efficiency vs Load Current =5.0V,V =1.2V,L=1.0μH) MODE=L MODE=L MODE=H MODE=H Figure 8. Line Regulation Figure 9. Load Regulation （V =1.2V,I =3A） =5.0V,V =1.2V） © 2020 ROHM Co., Ltd. No. 63UG041E Rev.001 AUG.2020...
- Page 7 IOUT 1A/div Time 1ms/div Time 1ms/div Figure 12. Load Response (I =0.1A-3A) Figure 13. Load Response (I =0A-3A) =5.0V, V =1.2V, V =0V, C =22μFx2) =5.0V, V =1.2V, V =22μFx2) MODE MODE © 2020 ROHM Co., Ltd. No. 63UG041E Rev.001 AUG.2020...
- Page 8 VOUT 1V/div VSW 5V/div VSW 5V/div Time 1ms/div Time 1ms/div Figure 16. Boot by VIN (VIN=0V-5V) Figure 17. Shutdown by VIN (VIN=5V-0V) =1.2V, V =0.4Ω) =1.2V, V =0.4Ω) FREQ LOAD FREQ LOAD © 2020 ROHM Co., Ltd. No. 63UG041E Rev.001 AUG.2020...
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Page 9: Revision History
BD9B304QWZ-EVK-001 User’s Guide Revision History Revision Date Description Number 27. AUG. 2020 Initial release © 2020 ROHM Co., Ltd. No. 63UG041E Rev.001 AUG.2020... - 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.
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