RT9911
CH1 Boost Output Voltage vs. V
DDM
Voltage
3.30
3.29
CH1 Buck Output Voltage vs. Output Current
3.375
3.374
Output Voltage (V)
Output Voltages (V)
3.28
3.27
3.26
3.25
3.24
3.23
3.22
3.21
3.20
2.4
2.8
3.2
3.6
4.0
4.4
4.8
5.2
5.6
3.373
3.372
3.371
3.370
3.369
3.368
3.367
3.366
3.365
0
100
200
300
400
500
600
700
800
900
V
IN
= 2.5V, V
OUT
= 3.3V, I
OUT
= 250mA
V
IN
= 3.7V, V
OUT
= 3.3V
V
DDM
Voltage (V)
Loading Current (mA)
CH1 Boost Output Voltage vs. Output Current
3.330
3.329
3.328
100
90
80
CH2 Buck Efficiency vs. Output Current
Output Voltages (V)
3.326
3.325
3.324
3.323
3.322
3.321
3.320
0
100
200
300
400
500
600
700
800
900
Efficiency (%)
3.327
70
60
50
40
30
20
V
IN
= 2.5V
= 3.0V
= 3.8V
= 4.5V
V
IN
= 2.4V, V
OUT
= 3.3V
10
0
V
OUT
= 1.8V
10
100
1000
Output Current (mA)
Output Current (mA)
CH2 LX2 and Output Voltage Ripple
V
IN
= 3.3V, V
OUT
= 1.8V, I
OUT
= 300mA
CH2 LX2 and Output Voltage Ripple
V
IN
= 4.2V, V
OUT
= 2.5V, I
OUT
= 400mA
V
OUT
(10mV/Div)
LX2
(2V/Div)
Time (1μs/Div)
V
OUT
(10mV/Div)
LX2
(2V/Div)
Time (1μs/Div)
DS9911-04 August 2007
www.richtek.com
13
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
