RT9511 RICHTEK [Richtek Technology Corporation], RT9511 Datasheet - Page 4

• Manufacturer Part Number: RT9511
• Description: Fully Integrated Battery Charger with Two Step-Down Converters
• Manufacturer: RICHTEK [Richtek Technology Corporation]

RT9511
Function Block Diagram
www.richtek.com
4
ISETU
ISETA
GND
EN1
EN2
FB1
FB2
EN
MOSFET
SENSE
Current
Setting
+
-
Pre-Charge Phase
1/10 Programmed
USB
Charge Current
Charge Current
Programmed
P-MOSFET
USB
USB
Logic &
Control
2.8V Precharge
V
Figure 1 . Charging I-V Curve
REF
Fast Charge
Threshold
Phase
ACIN/USB
MOSFET
Charge Input
SENSE
Selection
Loop Controller
V
REF
Constant Voltage
Standby Phase
DRV
4.1V Recharge
Thermal
P-MOSFET
Sense
Threshold
Phase &
ACIN
+
-
ACIN
V
FB
Re-Charge Phase
Complete
Charge
2.5V
Temperature Fault
Temperature
Logic &
Control
V
Sense
REF
+
-
Logic
Comparator
OVP
Timer
OVP
Battery
Voltage
Charging
Current
DS9511-01 April 2011
CHG_S
TIMER
BATT
TS
AC_ON
BAT_ON
SYS
VDD1
LX1
VDD2
LX2