RT9502 RICHTEK [Richtek Technology Corporation], RT9502 Datasheet - Page 4

• Manufacturer Part Number: RT9502
• Description: Linear Single Cell Li-Ion Battery Charger IC with Dual Input Supply
• Manufacturer: RICHTEK [Richtek Technology Corporation]

RT9502
www.richtek.com
4
RT9502 Flow Chart
(V
V
V
V
V
V
ACIN
V
ACIN
USB
V
USB
ACIN
BATT
V
ACIN/USB
1ms Delay
EN
Power Up
TS
TS
Start-Up
< V
> 1.4V ?
< 4.4V and
and
< 4.4V) ?
NO
NO
< 0.5V?
NO
NO
> 6.5V or
< V
> 2.5V
or
> 2.8V?
BATT
BATT
NO
?
I
/CHG_S Pull Down
Precharge Phase
BATT
Current
= 0.1 Charge
YES
YES
NO
YES
YES
Table
YES
Fast Charge Phase
/CHG_S Pull Down
I
BATT
I
BATT
V
BATT ~
Current
< 0.1 I
YES
= Charge
4.2V,
CHG
?
YES
OVP/UVP MODE
DISABLE MODE
P-MOSFET OFF
P-MOSFET OFF
FAULT/CHG_S
P-MOSFET OFF
IMPEDANCE
SLEEP MODE
V
Standby/Fault
PFET OFF
BATT
STANDBY
I
BATT
TEMP
I
I
HIGH
I
BATT
BATT
BATT
= 4.2V,
=0
=0
=0
= 0
NO
V
DS9502-02 April 2011
Recharge Phase
RECHARGE
BATT
YES
> 4.1 V?