BD9122GUL_12 Datasheet, PDF (2/19 Pages) Rohm – 2.5V to 5.5V, 0.3A 1ch Synchronous Buck Converter integrated FET

0J3J0AJ00110
●Pin Configuration
(Top View)
SW B1
A1 PGND
PVcc B2
A2 GND
Vcc B3
A3 EN
ADJ B4
A4 ITH
Datasheet
●Pin Description
Pin No.
A1
A2
A3
A4
B1
B2
B3
B4
Fig.2 Pin Configuration
Pin name
PGND
GND
EN
ITH
SW
PVCC
VCC
ADJ
Pin function
Nch FET source pin
Ground
Enable pin（Active High）
Gm Amp output pin/Connected phase compensation capacitor
Pch/Nch FET drain output pin
Pch FET source pin
Vcc power supply input pin
Output voltage detect pin
●Block Diagram
VCC
EN
VREF
Gm Amp
+
Current
Comp
+
RQ
S
SLOPE
CLK
OSC
VCC
Soft
UVLO
Start
TSD
SCP
ADJ
ITH
RITH CITH
R2
R1
PVCC
Current
Sense/
Protect
+
Driver
Logic
VCC
3.3V
Input
10µF
4.7µH
SW
4.7μF
Output
PGND
GND
Fig.3 Block Diagram
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TSZ02201-0J3J0AJ00110-1-2
02.MAR.2012 Rev.001