BD9123MUV_11 Datasheet, PDF (4/18 Pages) Rohm – Output 1.5A or Less High-efficiency Step-down Switching Regulator with Built-in Power MOSFET

BD9123MUV
●Characteristics data
2.0
【VOUT=1.0V】
1.6
1.2
0.8
0.4
0.0
0
Io=1.2A
Ta=25℃
1
2
3
4
5
INPUT VOLTAGE:VCC[V]
Fig.4 Vcc-VouT
1.04
【VOUT=1.0V】
1.02
1.00
0.98
VCC=5V
Io=0A
0.96
-40 -20 0 20 40 60 80 100
INPUT VOLTAGE:VCC[V]
Fig. 7 Ta-VOUT
1200
1000
800
600
400
VCC=5V
200
0
-40 -20 0 20 40 60 80 100
TEMPERATURE:Ta[℃]
Fig.10 Ta-Fosc
400
350
300
250
200
150
100
VCC=5V
50
0
-40 -20 0 20 40 60 80 100
TEMPERATURE:Ta[℃]
Fig.13 Ta-Icc
2.0
【VOUT=1.0V】
1.6
1.2
0.8
VCC=5V
Io=0A
0.4
Ta=25℃
0.0
0
1
2
3
4
5
EN VOLTAGE:VEN[V]
Fig.5 VEN - VOUT
100
90 ^{【VOUT=1.0】}
80
70
60
50
40
30
20
Vcc=5.0V
10
Ta=25℃
0
1
10
100
1000 10000
Io [A]
Fig.8 Efficiency
200
High side
175 (PMOS FET)
150
125
Low side
100
(NMOS FET)
75
50
VCC=5.0V
25
0
-40 -20 0 20 40 60 80 100
TEMPERATURE:Ta[℃]
Fig.11 Ta-RONN,RONP
【VOUT=1.0V】
SW
VCC=5V
VO
Io=1.2A
Ta=25℃
Fig.14 Soft start waveform
Technical Note
2.0
【VOUT=1.0V】
1.6
1.2
0.8
0.4
VCC=5V
Ta=25℃
0.0
0
1
2
3
4
5
EN VOLTAGE:VEN[V]
Fig.6 IOUT-VOUT
2.0
1.5
1.0
0.5
Ta=25℃
0.0
2.7
3.4
4.1
4.8
5.5
INPUT VOLTAGE:VCC[V]
Fig.9 Power supply voltage-
Operating frequency
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
VCC=5V
1.1
1.0
-40 -20 0 20 40 60 80 100
TEMPERATURE:Ta[℃]
Fig.12 Ta-VEN
【SLLM control VOUT=1.0V】
VCC=5V
Io=0A Ta=25℃
SW
VO
Fig.15 SW waveform Io=0mA
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4/17
2011.01 - Rev.A