BD9139MUV Datasheet, PDF (13/17 Pages) Rohm – Output 2A or More High-efficiency Step-down Switching Regulators with Built-in Power MOSFET

BD9139MUV
●BD9139MUV Cautions on PC Board layout
Technical Note
Fig.35 Layout diagram
① Lay out the input ceramic capacitor CIN closer to the pins PVCC and PGND, and the output capacitor Co closer to the
pin PGND.
② Lay out CITH and RITH between the pins ITH and GND as neat as possible with least necessary wiring.
※ VQFN016V3030 (BD9139MUV) has thermal PAD on the reverse of the package.
The package thermal performance may be enhanced by bonding the PAD to GND plane which take a large area
of PCB.
●Recommended components Lists on above application
Symbol
Part
L Coil
CIN Ceramic capacitor
CO Ceramic capacitor
Cf Ceramic capacitor
Rf Resistance
CBST Ceramic capacitor
Value
2.0uH
2.2uH
22uF
22uF
1000 pF
10Ω
0.1 uF
Manufacturer
Sumida
Sumida
Murata
Murata
Murata
Rohm
Murata
Series
CDR6D28MNP-2R0NC
CDR6D26NP-2R2NC
GRM32EB11A226KE20
GRM31CB30J226KE18
GRM18 Series
MCR03 Series
GRM18 Series
*VIN=3.3V
VOUT Co=22μF
1.0V 7.5kΩ
1.2V 7.5kΩ
1.5V 8.2kΩ
1.8V 10kΩ
*VIN=5V
VOUT
1.0V
1.2V
1.5V
1.8V
2.5V
3.3V
Co=22μF
4.7kΩ
4.7kΩ
6.8kΩ
8.2kΩ
10kΩ
12kΩ
Co=44μF
13kΩ
15kΩ
18kΩ
18kΩ
RITH
Manufacturer
Rohm
Rohm
Rohm
Rohm
Co=44μF
9.1kΩ
10kΩ
12kΩ
15kΩ
18kΩ
24kΩ
RITH
Manufacturer
Rohm
Rohm
Rohm
Rohm
Rohm
Rohm
Series
MCR03 Series
MCR03 Series
MCR03 Series
MCR03 Series
Co=22μF
6800pF
6800pF
4700pF
4700pF
Co=44μF
6800pF
6800pF
6800pF
6800pF
CITH
Manufacturer
Murata
Murata
Murata
Murata
Series
MCR03 Series
MCR03 Series
MCR03 Series
MCR03 Series
MCR03 Series
MCR03 Series
Co=22μF
6800pF
6800pF
6800pF
6800pF
4700pF
4700pF
Co=44μF
6800pF
6800pF
6800pF
6800pF
4700pF
4700pF
CITH
Manufacturer
Murata
Murata
Murata
Murata
Murata
Murata
Series
GRM18 Series
GRM18 Series
GRM18 Series
GRM18 Series
Series
GRM18 Series
GRM18 Series
GRM18 Series
GRM18 Series
GRM18 Series
GRM18 Series
※The parts list presented above is an example of recommended parts. Although the parts are sound, actual circuit characteristics should be
checked on your application carefully before use. Recommended value of R_ITH and C_ITH varies by VIN and Co. Co=22μF is recommended.
However, in case of using large Co to reduce output ripple, please refer to the list above. Be sure to allow sufficient margins to
accommodate variations between external devices and this IC when employing the depicted circuit with other circuit constants modified.
Both static and transient characteristics should be considered in establishing these margins. When switching noise is substantial and may
impact the system, a low pass filter should be inserted between the VCC and PVCC pins, and a schottky barrier diode or snubber
established between the SW and PGND pins.
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13/16
2009.05 - Rev.A