BD9121GUL Datasheet, PDF (2/5 Pages) Rohm – Silicon Monolithic Integrated Circuit

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○ ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Ta=25℃, VCC=PVCC=3V, VOUT=1.3V）
Parameter
Limit
Symbol
Min.
Typ.
Max.
Unit
Condition
Bias Current
ICC
-
400
640
μA
Output Voltage1
VOUT1
-2
-
+2
%
Output Voltage2
VOUT2
-3
-
+3
% Ta=-25～85℃
Oscillation Frequency1
FOSC1
2.4
3
3.6
MHz
Oscillation Frequency2
FOSC2
2.1
3
3.9
MHz Ta=25～85℃
Pch FET ON Resistance
RONP
-
0.3
0.6
Ω PVCC=3V
Nch FET ON Resistance
RONN
-
0.2
0.4
Ω PVCC=3V
ITH Sink Current
ITHSI
10
20
-
μA VOUT=2V, SEL=OPEN
ITH Source Current
ITHSO
10
20
-
μA VOUT=0.8V, SEL=OPEN
UVLO Threshold Voltage
VUVLO1
2.1
2.25
2.4
V
VCC=3→0V
UVLO Release Voltage
VUVLO2
2.12
2.3
2.5
V
VCC=0→3V
Soft Start Time
TSS
25
50
100
μs
Timer Latch Time
TLATCH
0.68
1.36
2.72
ms
SCP/TSD
Operational Mode
Output Short circuit
Threshold Voltage
VSCP
-
0.65
1
V
VOUT=1.3→0V,
SEL=OPEN
○PHYSICAL DIMENSION
9121
○BLOCK DIAGRAM・APPLICATION CIRCUIT
Lot No.
SEL
VREF
Current
Comp
+
RQ
S
Gm Amp SLOPE
CLK
+
OSC
VCC
Soft
UVLO
Start
TSD
SCP
VOUT ITH
VCC ^0.1μF
PVCC ^10Ω
Current
Sense/
Protect
4.7μF
3V
Input
+
Driver
Logic
L
SW
4.7μF
Output
PGND
GND
RITH CITH
VCSP50L2 (UNIT:mm)
REV. A