RT9901 Datasheet, PDF (13/19 Pages) Richtek Technology Corporation – 4 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down

Preliminary
Buck2 LX & Output Ripple
RT9901
Buck2 LX & Output Ripple
@IOUT = 250mA
VDD2 = 4.5V, VDDM = 3.3V, VOUT = 1.8V
Time (500ns/Div)
@IOUT = 500mA
VDD2 = 4.5V, VDDM = 3.3V, VOUT = 1.8V
Time (500ns/Div)
Buck3 Efficiency vs. Output Current
100
VOUT = 1.5V
VIN = 2.2V
90
80
VIN = 4.5V
VIN = 2.5V
70
VIN = 3V
VIN = 3.8V
60
50
1
10
100
Output Current (mA)
1000
Buck3 Efficiency vs. Output Current
100
VOUT = 2.5V
90
VIN = 4.5V
80
70
VIN = 3.8V
60
50
VIN = 3V
40
30
1
10
100
Output Current (mA)
1000
DS9901-12 August 2007
Buck3 Efficiency vs. Output Current
100
VOUT = 1.8V
VIN = 2.5V
90
80
VIN = 4.5V
VIN = 3.8V VIN = 3V
70
60
50
1
10
100
Output Current (mA)
1000
1.806
1.804
Buck3 Output Voltage vs. V_DD3 Voltage
VBAT = VDDM = 3.3V, IOUT = 250mA
1.802
1.8
1.798
1.796
1.794
1.792
1.79
2
2.5
3
3.5
4
4.5
V_DD3 Voltage (V)
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