RT9945 Datasheet, PDF (15/33 Pages) Richtek Technology Corporation – Power Management ICs for Handheld Device

RT9945
VBuck1
(50mV/Div)
Buck1 Load Transient Response
VBATT = 4V, IOUT = 0.1A to 0.6A
VBuck2
(50mV/Div)
Buck2 Load Transient Response
VBATT = 4V, IOUT = 0.1A to 0.6A
IBuck1
(200mA/Div)
Time (250μs/Div)
IBuck2
(200mA/Div)
Time (250μs/Div)
Buck Frequency vs. Input Voltage
2.5
Buck1
2.0
1.5
Buck2
VLDO1
(50mV/Div)
LDO1 Load Transient Response
VBATT = 4V, IOUT = 50mA to 500mA
1.0
0.5
ILDO1
(200mA/Div)
IOUT = 200mA
0.0
3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Input Voltage (V)
Time (100μs/Div)
LDO1 Output Voltage vs. Output Current
3.36
VBATT = 3.8V
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
0
0.1
0.2
0.3
0.4
0.5
Output Current (A)
LDO1 Dropout Voltage vs. Temperature
140
120
100
80
60
40
20
IOUT1 = 200mA
0
-40
-15
10
35
60
85
Temperature (°C)
DS9945-01 April 2011
www.richtek.com
15