BD8301MUV Datasheet, PDF (3/14 Pages) Rohm – High-effciency Step-up/down Switching Regulator with Built-in Power MOSFET

BD8301MUV
●Description of Pins
Lx1 PGND
PVCC
15 14 13 12 11
PVCC ¹⁶
17
VCC ₁₈
STB ₁₉
RT ₂₀
1 23 4 5
1 0 _PGND
9
8 _Lx2
7
6 ^VOUT
Technical Note
Pin No.
1
2
3～4
5～6
7～8
9～12
13～14
15～17
18
19
20
Pin Name
FB
INV
GND
VOUT
Lx2
PGND
Lx1
PVCC
VCC
STB
RT
Function
Error AMP output terminal
Error AMP input terminal
Ground terminal
Output voltage terminal
Output side coil connecting terminal
Power transistor ground terminal
Input side coil connecting terminal
DC/DC converter input terminal
Control part power supply input
terminal
ON/OFF terminal
Oscillation frequency set terminal
Fig.1 Pin layout
●Block Diagram
STB
RT
VCC
PVCC
STBY_IO
Reference
UVLO
GND _q
FB
ERROR_AMP
VREF
FB H
OSC
STOP
SCP
16000 ｃount
PRE
DRIVER
PWM
CONTROL
TIMMING
CONTROL
TIMMING
CONTROL
PRE
DRIVER
VREF
PRE
DRIVER
PRE
DRIVER
Soft
INV
Start
VOUT
LX2
Fig.2 Block diagram
LX1
PGND
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3/13
2009.09 - Rev.C