RT9527 RICHTEK [Richtek Technology Corporation], RT9527 Datasheet - Page 13

• Manufacturer Part Number: RT9527
• Description: Single Cell Li-Ion Battery Charger with Adjustable Charging Current for Portable Applications
• Manufacturer: RICHTEK [Richtek Technology Corporation]

Copyright
DS9527-00 May 2012
Operation State Diagram for Charger Function (RT9527)
Note1 :
If termination happens, CHG will be latched H.
Note2 :
If time out happens, CHG will become high impedance.
(V
But V
(V
NO
IN
IN
> V
> V
BAT
V
©
OVP
Power Off State
OVP
OVP
2012 Richtek Technology Corporation. All rights reserved.
Or V
Standby State
PFET = OFF
< V
PFET = OFF
V
Any State
> V
IN
or V
or V
IN
REG
> V
IN
< V
IN
IN
YES
YES
- 0.1 can not release CHG latch H state.
> V
OVP
UVLO
< V
< V
UVLO
UVLO
UVLO
or V
or V
IN
IN
– V
– V
NO
NO
V
IN
Time Counter
PFET = OFF
BAT
BAT
V
Sleep State
– V
BAT
CHG = H (latch)
CHG = H (latch)
Time > Ttermi
V
Reset
Termination
< V
< V
ICHG = 0A
I
BAT
YES
YES
BAT
BAT
CV Mode
< V
Charge
YES
OS_L
OS_L
< Iterm
REG
= 4.2V
> V
Figure 2. Operation State Diagram for Charging
) will release CHG latch H state.
) will release time out state
OS
- 0.1V
NO
NO
V
YES
Power re-plug
BAT
Pre-CHG State
I
I
CHG = L
CHG_P
CHG_F
V
~4.2V
YES
NO
BAT
= 0.1 x
> 3V
YES
YES
CHG = H (latch)
YES
Time < Tpchg
NO
Fast-Charge
YES
Mode
CHG = High impedance
NO
NO
Time < Tfchg
PFET = OFF
FAULT
CHG = High impedance
is a registered trademark of Richtek Technology Corporation.
NO
Time < Tpchg
PFET = OFF
NO
FAULT
Time < Tfchg
Fast-Charge
CHG = L
NO
Mode
YES
NO
NO
YES
Pre-CHG State
I
I
CHG = L
CHG_P
CHG_F
YES
V
Power re-plug
BAT
= 0.1 x
> 3V
V
YES
NO
BAT
~4.2V
YES
NO
NO
NO
V
CHG = H (latch)
IN
Time >Ttermi
V
PFET = OFF
V
I
Termination
Sleep State
BAT
– V
RT9527
BAT
ICHG = 0A
YES
CV Mode
CHG = L
BAT
Counter
www.richtek.com
Charge
Reset
Time
- 0.1V
< Iterm
BAT
< V
= 4.2V
YES
YES
REG
> V
OS
NO
13