BD9137MUV Datasheet, PDF (15/17 Pages) Rohm – High Efficiency Step-down Switching Regulator

7. Ground wiring pattern
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.
8 . Selection of inductor
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.
●Ordering part number
B D 9 1 3 _7M U V^― E 2
ROHM part number
Type
37 : Adjustable (0.8～3.3V)
Package
Package specification
MUV : VQFN020V4040 E2 : Embossed taping
VQFN020V4040
<Dimension>
4.0±0.1
S
0.08 S
C0.2 ^2.1±0.1
1
5
20
6
16
15
1.0
0.5
10
11
0.25^+-00..0045
(Unit:mm)
<Tape and Reel information>
Tape
Embossed carrier tape
Quantity
2000pcs
Direction
of feed
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)
Reel
1Pin
Direction of feed
※When you order , please order in times the amount of package quantity.
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