RT5112A
Buck2 Efficiency
Buck2 Load Regulation
100
95
2.91
2.90
2.89
2.88
2.87
2.86
2.85
2.84
VINB2 = 3.4V
VINB2 = 3.8V
VINB2 = 4.35V
90
85
80
75
70
VINB2 = 4.35V
VINB2 = 3.8V
VINB2 = 3.4V
VBUCK2 = 2.85V
0.8 1.0 1.2
VBUCK2 = 2.85V
0.8 1.0 1.2
0.0
0.2
0.4
0.6
0.0
0.2
0.4
0.6
Load Current (A)
Load Current (A)
Buck2 Output Voltage Ripple vs. Load Current
Buck2 Switching Frequency vs. Load Current
3.0
60
50
2.5
2.0
VINB2 = 4.35V
VINB2 = 3.8V
VINB2 = 3.4V
40
30
20
10
0
1.5
VINB2 = 3.4V
VINB2 = 3.8V
VINB2 = 4.35V
1.0
0.5
VBUCK2 = 2.85V
0.8 1.0 1.2
VBUCK2 = 2.85V
1.0 1.2
0.0
0.0
0.2
0.4
0.6
0.8
0.0
0.2
0.4
0.6
Load Current (A)
Load Current (A)
Buck2 Power On
Buck2 Power Off
SCL
SCL
(2V/Div)
(2V/Div)
VINB2
(1V/Div)
VINB2
(1V/Div)
VINB2 = 3.8V, VBUCK2 = 2.85V, IBUCK2 = 0mA
VBUCK2
(1V/Div)
VBUCK2
(1V/Div)
VINB2 = 3.8V, VBUCK2 = 2.85V, IBUCK2 = 0mA
IIN
IIN
(50mA/Div)
(50mA/Div)
Time (200μs/Div)
Time (2ms/Div)
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16
DS5112A-02 August 2019
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
