RT8205L RICHTEK [Richtek Technology Corporation], RT8205L Datasheet - Page 22

• Manufacturer Part Number: RT8205L
• Description: High Efficiency, Main Power Supply Controller for Notebook Computer
• Manufacturer: RICHTEK [Richtek Technology Corporation]

RT8205L/M
www.richtek.com
22
Over Voltage
Power UP
Protection
Protection
Discharge
Shutdown
Shutdown
Standby
Thermal
Voltage
Mode
Under
RUN
V
V
ENTRIPx
ENTRIPy
V
V
OUTx
OUTy
(a). Start-Up at the Same Time
< 60µs
VREG
EN = high, VOUT1 or VOUT2
enabled
Either output > 111% of the nominal
level.
Either output < 52% of the nominal
level after 3ms time out expires and
output is enabled
Either SMPS output is still high in
either standby mode or shutdown
mode
ENTRIPx < startup threshold,
EN = high.
EN = low
T
J
0.515V
> 150°C
0.515V
X
< UVLO threshold
Condition
Figure 5. Time Diagrams of Power Sequence
Table 2. Operation Mode Truth Table
Transitions to discharge mode after a V
REF becomes valid. VREG5, VREG3, and REF remain
active.
Normal Operation.
LGATEx is forced high. VREG3, VREG5 and REF active.
Exited by VIN POR or by toggling EN, ENTRIPx
Both UGATEx and LGATEx are forced low and enter
discharge mode. VREG3, VREG5 and REF are active.
Exited by VIN POR or by toggling EN, ENTRIPx
During discharge mode, there is one path to discharge the
outputs capacitor residual charge. That is output capacitor
discharge to GND through an internal switch.
VREG3, VREG5 and REF are active.
All circuitry off.
All circuitry off. Exit by VIN POR or by toggling EN, ENTRIPx
V
V
ENTRIPx
ENTRIPy
V
V
OUTx
OUTy
> 60µs
0.515V
(b). Delay Start Mode
0.515V
Comment
≈
2ms
DS8205L/M-05 June 2011
IN
POR and after