rt9903b Richtek Technology Corporation, rt9903b Datasheet - Page 7

• Manufacturer Part Number: rt9903b
• Description: Channel Dc/dc Converters With High-efficiency Step-up
• Manufacturer: Richtek Technology Corporation

Typical Operating Characteristics
DS9903B-07 August 2007
100
95
90
85
80
75
70
65
0
V
V
V
V
V
IN
IN
OUT
BAT
BAT
= 4.5V
= 2.5V
CH1 Efficiency vs. Output Current
5
= 12V
= 3V, V
= 4.2V, V
10
V
V
DD
LX1
LX1
15
DD
Output Current (mA)
= 3.3V, @I
= 3.3V, @I
Time (1us/Div)
Time (1us/Div)
&
&
20
V
Output Ripple
Output Ripple
IN
= 3V
25
OUT
OUT
V
30
= 30mA
IN
= 30mA
= 3.8V
35
40
Preliminary
45
50
100
95
90
85
80
75
70
0
V
V
V
OUT
BAT
BAT
CH2 Efficiency vs. Output Current
= 15V
= 2.5V, V
= 3.8V, V
5
V
V
IN
IN
V
V
= 2.5V
= 4.5V
LX1
LX1
Output Current (mA)
DD
DD
10
= 3.3V, @I
= 3.3V, @I
Time (1us/Div)
Time (1us/Div)
&
&
Output Ripple
Output Ripple
15
RT9903B
OUT
OUT
= 30mA
= 30mA
20
V
www.richtek.com
V
IN
IN
= 3V
= 3.8V
25
30
7