BD6067GU_11 ROHM [Rohm], BD6067GU_11 Datasheet - Page 25

• 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
●Recommended PCB layout
www.rohm.com
Connect the input bypath capacitor CIN nearest to between VIN and GNDA pin, as shown in the upper diagram. Thereby, the
input voltage ripple of the IC can be reduced. And, connect the output capacitor COUT nearest to between VOUT and GND
pin. Thereby, the output voltage ripple of the IC can be reduced. Connect the current setting RFB nearest to VFB pin.
Connect the GND connection side of RFB directly to GND pin. Connect the GNDA pin directly to GND pin. When those pins
are not connected directly near the chip, influence is given to the performance of BD6069GUT /BD6072HFN, and may limit
the current drive performance. As for the wire to the inductor, make its resistance component small so as to reduce electric
power consumption and increase the entire efficiency. And keep the pins that are subject to the influence like VFB pin away
from the wire to SW.
The PCB layout in consideration of these is shown in the Fig.79 to 82.
GNDA
VOUT
Ci n
L1
Front surface (Top view)
Fig.79 BD6069GUT
EN
VB AT
１ ２V
Cout
SW
RFB
FB
VOUT
(VBAT=3.6V, Ta=25℃, VOUT=14V, 20mA Load)
１ １G
GND
Fig.78 Output noise
LED
L ED
LED
VOUT
25/29
VOUT
112mVpp
Bottom surface (Top view)
Fig.80 BD6069GUT
１ ２V
SW
GND
１ １G
2011.01 - Rev.C
Technical Note
VOUT