RT9511 RICHTEK [Richtek Technology Corporation], RT9511 Datasheet - Page 5

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

DS9511-01 April 2011
RT9511 Flow Chart
RT9511 Flow Chart
V
V
V
V
V
V
USB
USB
V
ACIN
BATT
ACIN
Start Timer
V
ACIN/USB
1ms Delay
/CE
Power Up
TS
TS
Start-Up
and
< 3.9V?
NO
and
< V
> 1.4V ?
NO
NO
< 0.5V?
> 2.5V
< V
or
< 4.3V
&
> 2.8V?
BATT
BATT
NO
?
NO
/CHG_S Strong Pull
I
BATT
Precharge Phase
? T
V
BATT
CHARGE
= 0.1 Charge
Current
Down
NO
> 2.8V?
UP?
YES
YES
NO
YES
YES
YES
YES
Fast Charge Phase
I
YES
BATT
I
/CHG_S Strong
BATT
T
CHARGE
Pull Down
Current
< 0.1 I
= Charge
YES
NO
NO
UP?
CHG
?
YES
YES
SLEEP MODE
/CHG_S HIGH
Standby/Fault
IMPEDANCE
UVP MODE
PFET OFF
PFET OFF
PFET OFF
PFET OFF
STANDBY
DISABLE
I
I
I
I
BATT
BATT
BATT
BATT
FAULT
FAULT
MODE
MODE
TEMP
TIME
OVP
= 0
= 0
= 0
= 0
YES
V
V
BATT
BATT
Recharge Phase
RECHAR
NO
YES
GE
NO
> 4.1 V?
> 4.1 V?
RT9511
www.richtek.com
5