BD8313HFN_11 Datasheet, PDF (3/18 Pages) Rohm – Output 1.5A or Less High-efficiency Step-down Switching Regulator with Built-in Power MOSFET

BD8313HFN
●Description of Pins
Technical Note
GND
VCC
VREG
PGND
INV
STB
PVCC
Lx
Fig.1 Terminal layout
Pin No.
1
2
3
4
5
6
7
8
Pin Name
Function
GND Ground terminal
VCC Control part power input terminal
VREG 5 V output terminal of regulator for internal circuit
PGND Power transistor ground terminal
Lx Coil connecting terminal
PVCC DC/DC converter input terminal
STB ON/OFF terminal
INV Error AMP input terminal
●Block Diagram
ON/OFF
STB
VREG VCC
PVCC
GND
STBY_IO
5V REG
Reference UVLO
VREF
OSC
1.0MHz
DC/DC
converter
100% High
Duty
STOP
VREF
SCP
OSC×4000 ｃount
PRE
DRIVER
450mΩ
PWM
CONTROL
Step down
TIMMING
CONTROL
VREG
PRE
DRIVER
ERROR_AMP
300mΩ
INV
Soft
Start
OSC×8000 ｃount
LX
PGND
Fig.2 Block diagram
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2011.04 - Rev.D