Technical Note
5/13
www.rohm.com
2011.05 - Rev.B
© 2011 ROHM Co., Ltd. All rights reserved.
BD95830MUV
●Pin Descriptions
・EN1 / EN2
When the input voltage on the EN pin reaches at least 2.2V, the switching regulator becomes active. At voltages less
than 0.3 V, the switching regulator becomes inactive, and the input current drops to 10µA or less. Thus the IC can be
controlled from 2.5V, 3.3V or 5V power supplies.
・V
INS
The IC determines the duty cycles internally based upon the input voltage on this pin. Therefore, variations in voltage on
this pin can lead to highly unstable operation. This pin also acts as the voltage input to the internal switching regulator
block, and is sensitive to the impedance of the power supply. Attaching a bypass capacitor or RC filter on this pin as
appropriate for the application is recommended.
・V
REG
Reference voltage output pin. If at least 2.2V is supplied to either the EN1 or EN2 pin, the reference output is switched on.
This pin supplies 5.0V at up to 10mA. Inserting a 2.2µF capacitor (with a X5R or X7R rating) between the VREG and
GND pins is recommended.
・V
CC
This is the power supply pin for all internal circuitry. This pin can be supplied directly by a 5V source, or connect with the
V
REG
pin.
・GND
This is the ground pin for all internal analog and digital power supplies.
・V
OUT1 / VOUT2
This is the output voltage sense pin; this pin features an integrated discharge FET used to discharge the output capacitor
when status is set to OFF.
・FB1 / FB2
This is the output feedback pin. FB is compared with REF (Refer to p.8) of IC. Set the output voltage with total about
10kΩ resistances.
・V
IN1 / VIN2
This is the input voltage pin for Power supply. Connect a input capacitor as appropriate for the ripple current and the load
to the pin directly.
・BOOT1 / BOOT2
This pin supplies voltage used for driving the high-side FET. Inserting a 0.1µF ceramic capacitor between the pin and SW
pins is recommended. Maximum absolute ratings are 21V from GND and 5.5V from SW. BOOT voltage swings between
(VIN + VREG) and VREG during active operation.
・SW1 / SW2
This pin is connected to inductor (L). Maximum absolute rating is 15V from GND. SW voltage swings between V
IN and
PGND.
・PGND1 / PGND2
This pin acts as the ground connection to the source of the low-side FET.
・TEST
This is the pin for TEST. Connect to GND Pin
.
