RT9503
ISETU Threshold Voltage vs. USB Voltage
2.0
VBATT = 3.8V
1.6
Rising
1.2
0.8
Falling
0.4
0.0
4.5 4.8 5.1 5.4 5.7
6
USB Voltage (V)
6.3 6.6
ACIN Power On
Regulation Voltage vs. Temperature
4.26
ACIN = 5V, ICharger = 500mA
4.24
4.22
4.20
4.18
4.16
4.14
-25 -15 -5
5 15 25 35 45 55 65 75 85
Temperature (°C)
USB Power On
VACIN
(5V/Div)
VSYS
(5V/Div)
EN
(5V/Div)
IACIN
(1A/Div)
VBATT = 3.7V, ISYS = 500mA, ICharger = 500mA
Time (1ms/Div)
VUSB
(5V/Div)
VSYS
(5V/Div)
EN
(5V/Div)
IUSB
(1A/Div)
VBATT = 3.7V, ISYS = 500mA, ICharger = 500mA
Time (1ms/Div)
VIN
(5V/Div)
VSYS
(5V/Div)
VBATT
(5V/Div)
IACIN
(1A/Div)
ACIN Power Off
ISYS = 500mA, ICharger = 500mA
Time (500us/Div)
VUSB
(5V/Div)
VSYS
(5V/Div)
VBATT
(5V/Div)
IUSB
(1A/Div)
USB Power Off
ISYS = 500mA, ICharger = 500mA
Time (500us/Div)
DS9503-03 April 2011
www.richtek.com
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