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RT9503A Просмотр технического описания (PDF) - Richtek Technology

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RT9503A Fully Integrated Linear Single Cell Li-Ion Battery Charger with Power Path Richtek
Richtek Technology Richtek
RT9503A Datasheet PDF : 15 Pages
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RT9503A
Application Information
The RT9503A is a fully integrated low cost single-cell Li-
Ion battery charger for portable applications. The RT9503A
can be adopted for two input power source including AC
and USB inputs. It will automatically select the input source
and operate in different mode as below.
AC Mode : When the AC input voltage (ACIN) is higher
than the UVP voltage level (3V), the RT9503A will enter
AC Mode. In the AC Mode, ACIN P-MOSFET is turned on
and USB P-MOSFET is turned off. When ACIN voltage is
below and OVP threshold levels, the switch Q1 will be
turned on and Q2 will be turned off. So, the system load
is powered directly from the adapter through the transistor
Q1, and the battery is charged by the RT9503A. Once
the ACIN voltage is higher than the OVP, the RT9503A
stops charging, and then Q1 will be turned off and Q2 will
be turned on to supply the system by battery.
USB Mode : When AC input voltage (ACIN) is removed
and USB input voltage is higher than UVP voltage level
(3V), the RT9503A will operate in the USB Mode. In the
USB Mode, ACIN P-MOSFET is turned off while USB
P-MOSFET and Q2 are turned on. The system load is
powered directly from the USB/Battery through the switch
Q2. Note that in this mode, the battery will be discharged
once the system current is higher than the battery charge
current.
Sleep Mode : The RT9503A will enter Sleep Mode when
both AC and USB input voltage are removed. This feature
provides low leakage current from the battery during the
absence of input supply.
VACIN > UVP ACIN Mode
USB Mode VACIN removed
VUSB > UVP
Sleep Mode
Both VACIN and
VUSB removed
Figure 1. Input Power Source Operation Mode
Power-Path Management
The RT9503A powers the system and independently
charging the battery while the input source is AC. This
feature reduces the charge time, allows for proper charge
termination, and allows the system to run with an absent
or defective battery pack.
Case 1 : Input Source is AC
In this case, the system load is powered directly from the
AC adapter through the transistor Q1. For RT9503A, Q1
and Q2 act as a switch as long as the RT9503A is ready.
Once the AC voltage is ready (<OVP), the battery charge
by the RT9503A internal MOSFET and Q1 starts regulating
the output voltage supply system (Q2 is turn off). Once
the AC voltage is higher than the operation voltage (>OVP),
the RT9503A stop charging battery, Q1 turns off and Q2
starts to supply power for system.
ISYS
System
RT9503A
Q1
SYS
BAT_ON
Q2
AC_ON
VIN
USB
ICharger
ACIN
USB
BATT
+
Battery
Figure 2. ACIN Input
Case 2 : Input Source is USB
In this case, the system load is powered directly from the
battery through the switch Q2. Note that in this case, the
system current over battery charge current will lead to
battery discharge.
System
RT9503A
Q1
SYS
BAT_ON
AC_ON
Q2
ISYS
VIN
USB
ACIN
ICharger
USB
BATT
+
Battery
Figure 3. USB Input
www.richtek.com
10
DS9503A-01 April 2011
Direct download click here

 

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