rt9903 Richtek Technology Corporation, rt9903 Datasheet - Page 9

• Manufacturer Part Number: rt9903
• Description: Channel Dc/dc Converters With High-efficiency Step-up
• Manufacturer: Richtek Technology Corporation

DS9903-07 August 2007
V
V
V
BAT
BAT
BAT
= 3V, V
= 2V, V
= 4.2V, V
V
V
V
DD
DD
LX3
LX4
LX3
DD
= 3.3V, @I
= 3.3V, @I
Time (1us/Div)
= 3.3V, @I
Time (1us/Div)
Time (1us/Div)
&
&
&
Output Ripple
Output Ripple
Output Ripple
OUT
OUT
OUT
= 20mA
= 100mA
= 20mA
Preliminary
100
95
90
85
80
1
V
V
V
OUT
BAT
BAT
CH4 Efficiency vs. Output Current
= 3.3V
= 2V, V
= 3.8V, V
V
V
DD
LX4
LX3
DD
Output Current (mA)
= 3.3V, @I
10
= 3.3V, @I
V
Time (1us/Div)
V
Time (1us/Div)
&
&
IN
IN
= 2V
Output Ripple
Output Ripple
= 3V
OUT
OUT
= 350mA
V
RT9903
= 20mA
100
www.richtek.com
IN
= 2.5V
1000
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