BD9122GUL_09 Datasheet, PDF (2/14 Pages) Rohm – Output 0.5A or Less High Efficiency Step-down Switching Regulator with Built-in Power MOSFET

BD9122GUL
●Electrical Characteristics
◎(Ta=25℃, VCC=PVCC=3.3V, EN=VCC, R1=20kΩ, R2=10kΩ, unless otherwise specified.)
Parameter
Symbol
Min.
Limits
Typ.
Max.
Standby current
ISTB
-
0
10
Bias current
ICC
-
250
400
EN Low voltage
VENL
-
GND
0.8
EN High voltage
VENH
2.0
VCC
-
EN input current
IEN
-
1
10
Oscillation frequency
FOSC
0.8
1
1.2
Pch FET ON resistance
RONP
-
0.3
0.6
Nch FET ON resistance
RONN
-
0.2
0.5
ADJ Voltage
VADJ
0.780
0.800
0.820
Output voltage
VOUT
-
1.200
-
ITH SInk current
ITHSI
10
20
-
ITH Source Current
ITHSO
10
20
-
UVLO threshold voltage
VUVLO1
2.2
2.3
2.4
UVLO release voltage
VUVLO2
2.22
2.35
2.5
Soft start time
TSS
0.5
1
2
Timer latch time
TLATCH
1
2
4
Output Short circuit Threshold Voltage
VSCP
-
VOUT×0.5
-
Technical Note
Unit
Conditions
μA
μA
V
V
μA
MHz
Ω
Ω
V
V
μA
μA
V
V
ms
ms
V
EN=GND
Standby mode
Active mode
VEN=3.3V
PVCC=3.3V
PVCC=3.3V
VADJ=1.0V
VADJ=0.6V
VCC=3→0V
VCC=0→3V
SCP/TSD operated
VOUT=2→0V
●Block Diagram, Application Circuit
VCC
EN
VREF
Current
Comp
+
RQ
S
Gm Amp _SLOPE
CLK
+
OSC
VCC
Soft
UVLO
Start
TSD
SCP
ADJ
ITH
RITH CITH
R1 ^R2
PVCC
VCC
3.3V
Input
Current
Sense/
Protect
10µF
+
Driver
Logic
4.7µH
SW
4.7μF
Output
PGND
GND
Fig.1 Block Diagram
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2/13
2009.05 - Rev.A