Rohm BD9E304FP4-LBZ EVK User manual

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© 2022 ROHM Co., Ltd. No. 64UG043E Rev.001
2022.2
User’s Guide
Switching Regulator Series
Buck Converter with Integrated FET
BD9E304FP4-LBZ EVK
BD9E304FP4-EVK-003 (12V→5V, 3.0A)
Introduction
This user’s guide provides the necessary steps to operate the EVK of ROHM’s BD9E304FP4-LBZ 1-channel Buck DC/DC
converter. This includes the external parts, operating procedures, and application data.
Description
This EVK has been developed for ROHM’s synchronous buck DC/DC converter customers evaluating BD9E304FP4-LBZ
and outputs 5V from 24V or 12V input voltage. The BD9E304FP4-LBZ accepts a power supply input range of 4.5V to
36V and generates an output voltage ranging from (0.1 x VIN or 0.7V) to 0.8 x VIN using external resistors. The operating
frequency is fixed at 300 kHz. The Light Load Mode control provides good efficiency characteristics in light load conditions,
which is ideal for applications that needs to lessen the standby power. The current mode control DC/DC converter provides
high-speed transient response performance. Additional protection functions include a built-in soft start function to prevent
inrush current at startup, UVLO (Under Voltage Lock Out), TSD (Thermal Shutdown Detection), SCP (Short Current
Protection), OCP (Over Current Protection), and OVP (Over Voltage Protection).
Application
Industrial Products as Factory Automation
Secondary power supply and adapter equipment
Telecommunication Devices
Operating Limits
Parameter Min Typ Max Units Conditions
Input Voltage 10.0 12.0 36.0 V
Output Voltage 5.0 V
Output Current Range 3.0 A
Operating Frequency 300 kHz
Maximum Efficiency 95.0 % Vin=12V, Iout=0.6A
UVLO Detect Voltage 3.9 V Vin sweep down
UVLO Hysteresis Width 350 mV

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© 2022 ROHM Co., Ltd. No. 64UG043E Rev.001
2022.2
User’s Guide
BD9E304FP4-EVK-003
EVK
Figure 1. BD9E304FP4-EVK-003(Top View)
EVK Schematic
Figure 2. BD9E304FP4-EVK-003 Circuit Diagram
Operating Procedure
1. Turn off the DC power supply and connect the GND terminal of the power supply to the GND_F terminal (left side in
EVK) of the EVK.
2. Connect the VCC pin of the DC power supply to the VIN_F pin of the EVK.
3. Connect the load to the VOUT_F and GND_F (right side in EVK) terminal of EVK. When using an electronic load,
connect with the load turned off.
4. Connect a voltmeter to the VOUT_S terminal and the GND_S terminal (right side in EVK) of EVK.
5. Connect the jumper of SW_EN to VIN (ON) side.
6. Turn on the DC power supply. Make sure the voltmeter shows 5V.
7. Turn on the electronic load.
(Caution) This EVK does not support hot plug. Do not perform hot plug test.
-LBZ

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© 2022 ROHM Co., Ltd. No. 64UG043E Rev.001
2022.2
User’s Guide
BD9E304FP4-EVK-003
Operation State Settings
Below is a table of BD9E304FP4-LBZ condition selectable using SW_EN.
Table 1. SW_EN Settings
SW_EN state BD9E304FP4-LBZ Condition
ON (short to VIN) Enable
OFF (short to GND) Shutdown
Parts list
Table 2. Parts list
Parts
Number Type Value
Size/
Size Code
[Unit:mm(inch)]
Power
Rating
Voltage/
Current
Rating
Temp.
Coefficient/
DCR
Tolera
nce Parts Name Manufacturer Quan tity
C1,C6 Capacitor 0.1μF 1005(0402) - 50V X5R ±10% GRM155R61H104KE14 Murata 2
C2 Capacitor 10μF 3225(1210) - 100V X7S ±10% GRM32EC72A106KE05 Murata 1
47μF 3216(1206) - 16V X5R ±10% GRM32EB31C476KE15L Murata 2
C5 Capacitor 120pF 0603(0201) - 50V C0G ±5% GRM0335C1H121JA01 Murata 1
C3 Capacitor 680pF 0603(0201) - 25V C0G ±5% GRM0335C1E681JA01 Murata 1
33k 1005(0402) 1/16W - - ±1% MCR01MZPF3302 ROHM 1
15k 1005(0402) 1/16W - - ±1% TRR01MZPF1502 ROHM 1
300k 1005(0402) 1/16W - - ±1% TRR01MZPF3003 ROHM 1
43k 1005(0402) 1/16W - - ±1% TRR01MZPF4302 ROHM 1
15μH 100100(4040) - Ist=5.1A DCR=35.2m
Ω±20% ±20% 1274AS-H-150M# Murata 1
U1 IC - 2.80x2.92 - - - - BD9E304FP4-LBZ ROHM 1
R5 - Short Soldering - - - - Shorted by Solder - 0
R6 - Open - - - - - - 0
R0 - Short Soldering - - - - Shorted by Solder - 0
EN,
VIN_S,VIN_F,
GND_Fx2,
GND_Sx2,
SS,
VOUT_S,
VOUT_F
Test Pin - 1mm Hole - 10A - - ST-2-2 Mac8 10
SW_EN Header - - - - - - 68000-103HLF Amphenol FCi 1
SW_EN Jumper - - - - - - QPC02SXGN-RC SULLINS 1
C7,C8 Capacitor
R3 Resistor
R4 Resistor
R2 Resistor
R1 Resistor
L1 Inductor

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© 2022 ROHM Co., Ltd. No. 64UG043E Rev.001
2022.2
User’s Guide
BD9E304FP4-EVK-003
Board Layout
EVK PCB information
Number of Layers Material Board Size Copper Thickness
4 FR-4 67.5mm x 67.5mm x 1.6mmt 1oz (35μm)
The layout of BD9E304FP4-EVK-003 is shown below.
Figure 3. Top Layer Layout
(Top View)
Figure 4. Middle1 Layer Layout
(Top View)
Figure 5. Middle2 Layer Layout
(Top View)
Figure 6. Bottom Layer Layout
(Top View)

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© 2022 ROHM Co., Ltd. No. 64UG043E Rev.001
2022.2
User’s Guide
BD9E304FP4-EVK-003
Reference application data
Figure 7. Operating Quiescent Current vs Input Voltage
（VIN=12V, VOUT=5V, IOUT=0A）
Figure 8. Switching Frequency vs Input Voltage
(VOUT=5V, IOUT=3A)
Figure 9. Efficiency vs Output Current (VOUT=5V)

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© 2022 ROHM Co., Ltd. No. 64UG043E Rev.001
2022.2
User’s Guide
BD9E304FP4-EVK-003
Reference application data - continued
Figure 10. VOUT Load Regulation
(VIN=12V, VOUT=5V)
Figure 11. VOUT Line Regulation
(VOUT=5V, IOUT=3A)
Figure 12. Rise-up Waveform
(VEN=0V→12V, IOUT=3A)
Figure 13. Shut-down Waveform
(VEN=12V→0V, IOUT=3A)
VOUT (10V/div)
SW (20V/div)
EN (20V/div)
VIN (20Vdiv)
2ms/div
SW (20V/div)
EN (20V/div)
VIN (20V/div)
VOUT (10V/div)
2ms/div
VOUT (5V/div)
SW (10V/div)
EN (10V/div)
VIN (10Vdiv)
2ms/div
SW (10V/div)
EN (10V/div)
VIN (10V/div)
VOUT (5V/div)
2ms/div

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© 2022 ROHM Co., Ltd. No. 64UG043E Rev.001
2022.2
User’s Guide
BD9E304FP4-EVK-003
Reference application data - continued
Figure 14. SW Waveform
（VIN=12V, VOUT=5V, IOUT=30ｍA）
Figure 15. SW Waveform
(VIN=12V, VOUT=5V, IOUT=3A)
Figure 16. Frequency Response
(VIN=12V, VOUT=5V, IOUT=3A)
VSW=5 V/div
VOUT AC (50mV/div)
SW (10V/div) 10µs/div SW (10V/div)
VOUT AC (50mV/div)
2µs/div
VOUT AC (50mV/div)
SW (5V/div) 10µs/div SW (5V/div)
VOUT AC (50mV/div)
2µs/div

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© 2022 ROHM Co., Ltd. No. 64UG043E Rev.001
2022.2
User’s Guide
BD9E304FP4-EVK-003
Products lists in the Parts list
The product names listed in the parts list are available during the time of creating this user’s guide. In case some parts are
no longer available in the future, select the equivalent products.
Selection of Ceramic Capacitors
In selecting the ceramic capacitors, consider the DC bias characteristics and select the parts with equivalent actual
capacitance of capacitors in the Parts List (Table 2). For reference, Figure 17 shows the DC bias characteristics of
GRM32EC72A106KE05 (Murata) listed as C2 in the Parts list (Table 2). Actual capacitance degrades to 8.1μF under the
condition of 12V output (DC bias voltage is 12V). When selecting an alternative component, select the product that has same
capacitance under 12V of DC bias voltage. (The data shown in Figure 17 is for reference only. Please check with the capacitor
manufacturer for the DC bias characteristics of ceramic capacitors.)
Figure 17. GRM32EC72A106KE05 (Murata) DC bias characteristics
DC bias characteristics
P/N
:
GRM
3
2EC72A106KE05
C-DC bias
capchange, 25.0degC, AC1Vrms
DC Bias:12.0V
Cap. Change Rate:-19%

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© 2022 ROHM Co., Ltd. No. 64UG043E Rev.001
2022.2
User’s Guide
BD9E304FP4-EVK-003
Revision History
Date Revision
Number
Description
21.Feb.2022 001 Initial release

R1102 B
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