bd9137muv ROHM Co. Ltd., bd9137muv Datasheet - Page 15

• Manufacturer Part Number: bd9137muv
• Description: High Efficiency Step-down Switching Regulator
• Manufacturer: ROHM Co. Ltd.

●Ordering part number
7. Ground wiring pattern
8 . Selection of inductor
If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND pattern from the
small-signal GND pattern and establish a single ground at the reference point of the set PCB so that resistance to the wiring pattern
and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal GND. Pay attention not to cause
fluctuations in the GND wiring pattern of external parts as well.
It is recommended to use an inductor with a series resistance element (DCR) 0.1Ω or less. Especially, in case output voltage is
set 1.6V or more, note that use of a high DCR inductor will cause an inductor loss, resulting in decreased output voltage. Should
this condition continue for a specified period (soft start time + hiccup delay), output short circuit protection will be activated and
output will be turned OFF. When using an inductor over 0.1Ω, be careful to ensure adequate margins for variation between
external devices and this IC, including transient as well as static characteristics.
VQFN020V4040
<Dimension>
ROHM part number
B
C0.2
D
1.0
0.08 S
20
16
0.5
15
2.1±0.1
4.0±0.1
1
5
11
0.25
9
6
10
+0.05
-0.04
S
1
Type
(Unit:mm)
37 : Adjustable (0.8～3.3V)
3
Tape
Quantity
Direction
of feed
7
<Tape and Reel information>
15/16
M
Reel
Embossed carrier tape
2000pcs
E2
(The direction is the 1pin of product is at the upper left when you hold
reel on the left hand and you pull out the tape on the right hand)
MUV : VQFN020V4040
Package
※ When you order , please order in times the amount of package quantity.
U
1Pin
V
―
Package specification
Direction of feed
E2 : Embossed taping
E
2