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RT9527 Datasheet(PDF) 13 Page - Richtek Technology Corporation

Part # RT9527
Description  Single Cell Li-Ion Battery Charger with Adjustable Charging Current for Portable Applications
PDF  14 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9527 Datasheet(HTML) 13 Page - Richtek Technology Corporation

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



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