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RT8205CGQW Datasheet(PDF) 27 Page - Richtek Technology Corporation

Part # RT8205CGQW
Description  High Efficiency, Main Power Supply Controllers for Notebook Computers
PDF  28 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8205CGQW Datasheet(HTML) 27 Page - Richtek Technology Corporation

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RT8205A/B/C
27
DS8205A/B/C-06 July 2012
www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Table 2. Operation Mode Truth Table
Mode
Condition
Comment
Power-UP
VREGx < UVLO threshold
Transitions to discharge mode after a VIN POR and after REF
becomes valid. VREG5, VREG3, and REF remain active.
RUN
EN = high, VOUT1 or VOUT2
enabled
Normal Operation.
Over
Voltage
Protection
Either output > 111% of the nominal
level.
LGATEx is forced high. VREG3, VREG5 active. Exited by VIN
POR or by toggling EN, ENT RIPx
Under
Voltage
Protection
Either output < 70% of the nominal
level after 3ms time-out expires and
output is enabled
Both UGATEx and LGATEx are forced low and enter discharge
mode. VREG3, VREG5 active. Exited by VIN POR or by
toggling EN, ENTRIPx
D ischarge
Either SMPS output is still high in
either standby mode or shutdown
mode
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.
Standby
ENTRIPx < startup threshold,
EN = high.
VREG3, VREG5 active.
Shutdown
EN = low
All circuitry off.
Thermal
Shutdown
TJ > +150°C
All circuitry off. Exit by VIN POR or by toggling EN, ENTRIPx.
Table 3. Power-Up Sequencing
EN
(V)
ENTRIP1
(V)
ENTRIP2
(V)
VREG5
VREG3
SMPS1
SMPS2
Low
X
X
Off
Off
Off
Off
“>1V”
=> High
Low
Low
On
(after REF
powers up)
On
(after REF
powers up)
Off
Off
“>1V”
=> High
Low
High
On
(after REF
powers up)
On
(after REF
powers up)
Off
On
“>1V”
=> High
High
(after ENTRIP2 is
high without 60us)
High
On
(after REF
powers up)
On
(after REF
powers up)
On
(after
SMPS2 on)
On
“>1V”
=> High
High
Low
On
(after REF
powers up)
On
(after REF
powers up)
On
Off
“>1V”
=> High
High
High (after ENTRIP1
is high without 60us)
On
(after REF
powers up)
On
(after REF
powers up)
ON
On
(after
SMPS1 on)
“>1V”
=> High
High
High
On
(after REF
powers up)
On
(after REF
powers up)
On
On



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