rt9278 Richtek Technology Corporation, rt9278 Datasheet - Page 11

• Manufacturer Part Number: rt9278
• Description: High Efficiency Boost Converter High Power White Driver
• Manufacturer: Richtek Technology Corporation

DS9278-04 August 2007
GPIO
V
I
OUT
V
V
LED
V
I
I
-100
LX
I N
IN
I N
400
200
100
IN
0
0
(1V/Div)
(10mV/Div)
(5V/Div)
(500mA/Div)
V
V
(2V/Div)
(500mA
/Div)
(500mA/Div)
IN
IN
= 4.2V, V
= 3.77V, Power LED = 200mA to 700mA
Load Transient Regulation
OUT
Normal Operation
(100mV/Div)
V
= 5V, I
Time (10ms/Div)
Time (1ms/Div)
IN
Time (1 s/Div)
Flash LED
= 4.2V, V
LOAD
= 100mA to 400mA
OUT
= 5V, I
Mode Transition
LOAD
= 300mA
Preliminary
GPIO
GPIO
I
I
LED
LED
V
V
I
I
400
200
I N
IN
I N
IN
-50
50
0
0
V
(2V/Div)
(500mA
/Div)
(500mA/Div)
V
V
(2V/Div)
(500mA/Div)
IN
IN
IN
= 3.0V, Power LED = 200mA to 700mA
= 1.5V, V
= 4.3V, Power LED = 200mA to 700mA
Load Transient Regulation
(100mV/Div)
(100mV/Div)
(500mA/Div)
OUT
Time (10ms/Div)
= 5V, I
Time (10ms/Div)
Time (1ms/Div)
Flash LED
Flash LED
LOAD
= 100mA to 300mA
RT9278
www.richtek.com
11