BD6067GU_11 ROHM [Rohm], BD6067GU_11 Datasheet - Page 24

• Manufacturer Part Number: BD6067GU_11
• Description: White Backlight LED Drivers for Small to Medium LCD Panels (Switching Regulator Type)
• Manufacturer: ROHM [Rohm]

© 2011 ROHM Co., Ltd. All rights reserved.
BD6067GU, BD6069GUT, BD6071HFN, BD6072HFN
►BD6069GUT, BD6072HFN
●Selection of external parts
●PCB Layout
www.rohm.com
Recommended external parts are as shown below.
When to use other parts than these, select the following equivalent parts.
・Coil
・Capacitor
・Resistor
The coil is the part that is most influential to efficiency. Select the coil whose direct current resistor (DCR) and current -
inductance characteristic is excellent. The BD6069GUTT/BD6072HFN is designed for the inductance value of 22µH. Do not
use other inductance value. Select a capacitor of ceramic type with excellent frequency and temperature characteristics.
Further, select Capacitor to be used for CIN/COUT with small direct current resistance, and pay sufficient attention to the
PCB layout shown in the next page.
In order to make the most of the performance of this IC, its PCB layout is very important. Characteristics such as efficiency
and ripple and the likes change greatly with PCB layout, which please note carefully.
Please refer to the reference data of p.20 for the change in the efficiency when the coil is changed.
<CIN>
<COUT>
<R
To battery
power source
Value
Value
Value
22μH
22μH
22μH
22μH
24Ω
1µF
1µF
FB
>
MURATA
MURATA
Fig.76 BD6069GUT PCB Layout Image
Tolerance
Tolerance
±10%
±20%
±20%
±20%
±1%
CIN
Manufacturer
VOUT
GNDA
VIN
COUT
MURATA
TDK
Coil Craft
TDK
ROHM
Manufacturer
Manufacturer
SW
EN
L1
TEST
VFB
GND
To battery GND
LQH32CN220K53
VLF3012AT220MR33
DO1608
VLF3010AT220MR33
GRM188B11A105K
GRM188B31E105K
MCR006YZPF24R0
Product number
Product number
Product number
RFB
24/29
RFB
Fig.77 BD6072HFN PCB Layout Image
4.45
2.5
2.6
2.6
1.6
1.6
0.6
W
L
L
EN
TEST
VFB
GNDA
Size (mm)
Size (mm)
Size (mm)
0.8
0.8
0.3
3.2
2.8
6.6
2.8
W
W
L
VOUT
GND
VIN
SW
CIN
0.23
1.55
2.92
0.8
0.8
1.2
1.0
H
H
H
COUT
To battery
power source
Temperature range
To battery GND
-25deg~+85deg
-25deg~+85deg
2011.01 - Rev.C
Technical Note
DCR (Ω)
L1
0.71
0.66
0.37
1.30