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© 2020 ROHM Co., Ltd.
No. 63UG064E Rev. 002
Apr. 2022
User’s Guide
BD9B305QUZ-EVK-001
Operating Procedure
Below is the procedures to operate the EVK.
1.
Turn off DC power supply and connect GND pin of the power supply to GND pin in EVK.
2.
Connect output pin of the power supply to VIN pin in EVK.
3.
Please short VIN pin and EN pin of SW_EN by a short jumper. (VIN input voltage in IC is supplied to EN pin.)
4.
Connect the load to VOUT pin and GND pin in EVK. If an electronic load is used, confirm that the power is OFF.
5.
Connect the voltmeter to VOUT_S pin and GND_S pin in EVK.
6.
Turn on DC power supply and check whether the output voltage is 1.8V.
7.
Turn on the electronic load.
Notes: The board does not support hot plugging protection. Do not perform hot plugging on this board.
Operation state settings
Depending on the voltage level of EN pin, BD9B305QUZ selects the operating status as Table1 shows.
Table1. EN pin settings
EN pin voltage
BD9B305QUZ status
High ( > 0.965V )
Enabled
Low ( < 0.830V )
Shutdown
BOM used in EVK
Below is the table of the bill of materials of EVK.
Table2. Part list (1.8V output voltage setting)
Symbol
Category
Part Number
Manufacturer
Value
Size (mm / inch)
Condition
L1
Inductor
FDSD0420-H-1R0M
MURATA
1.0μH
4242 / 1717
-
C1,C5
Ceramic Capacitor
GRM155R61H104KE14
MURATA
0.1uF ( 16V, X5R, ±10% )
1005 / 0402
-
C2
Ceramic Capacitor
GRM188R61A226ME15
MURATA
22 μF (10V, X5R, ±20%)
1608 / 0603
-
C3
Ceramic Capacitor
-
-
-
-
EMPTY
C4
Ceramic Capacitor
-
-
-
-
EMPTY
C6
Ceramic Capacitor
GRM0335C1H101JA01
MURATA
100pF(50V, C0G, ±5%)
0603 / 0201
-
C7
Ceramic Capacitor
AMK107BBJ476MA-RE
(MLASA168BB5476MRCA01)
TAIYO YUDEN
47μF(4V, X5R)
1608 / 0603
-
C8
Ceramic Capacitor
-
-
-
-
EMPTY
R1
Resistor
MCR01 series
ROHM
200kΩ(1%, 1/16W)
1005 / 0402
-
R2
Resistor
-
-
-
-
SHORT
R3
Resistor
MCR01 series
ROHM
100kΩ(1%, 1/16W)
1005 / 0402
-
R4
Resistor
MCR01 series
ROHM
100kΩ(1%, 1/16W)
1005 / 0402
-
R5
Resistor
-
-
-
-
SHORT
R6
Resistor
-
-
-
-
EMPTY
R0
Resistor
-
-
-
-
SHORT
