RT8223BZQW Ver la hoja de datos (PDF) - Richtek Technology
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RT8223BZQW Datasheet PDF : 26 Pages
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RT8223A/B
Table 2. Operation Mode Truth Table
Mode
Test Condition
Comment
Power-UP VREGx < UVLO threshold
RUN
EN = high, VOUT1 or VOUT2
en abl ed
Over
Voltage
Pr ote ction
E ith er
level.
outp ut
>
111%
of
the
nom in al
Under Either output < 70% of the nominal
Voltage level after 3ms time-out expires and
Protection output is enabled
Either SMPS output is still high in
Discharge either standby mode or shutdown
m ode
Standby
ENC < startup threshold,
EN = high.
Shutdown EN = low
Therma l
Shutdown
TJ > +150°C
Transitions to discharge mode after a VIN POR and after REF
becomes valid. VREG5, VREG3, and REF remain active.
Normal Operation.
LGATEx is forced high. VREG3, VREG5 active. Exited by VIN
POR or by toggling EN, ENTRIPx
Both UGATEx and LGAT Ex are forced low and enter discharge
mode. VREG3, VREG5 active. Exited by VIN POR or by
toggling EN, ENTRIPx, ENC
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 active.
All circuitry off.
All circuitry off. Exit by VIN POR or by toggling EN, ENTRIPx,
ENC
EN
(V)
Low
“>1V” =>
High
ENC
(V)
Low
Low
“>1V” => “>2V”
High => High
“>1V” => “>2V”
High => High
“>1V” => “>2V”
High => High
“>1V” => “>2V”
High => High
“>1V” => “>2V”
High => High
“>1V” => “>2V”
High => High
Table 3. Power Up Sequencing
ENTRIP1
(V)
ENTRIP2
(V)
VREG 5
VREG3
X
X
Off
Off
X
X
Low
Low
Low
High
High
(after ENTRIP2 is
high without 60μs)
High
High
Low
High
High (after
ENTRIP1 is high
without 60μs)
High
High
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
On
(after REF
powers up)
SMPS1
Off
Off
SMPS2
Off
Off
Off
Off
Off
On
On
(after
On
SMPS2 on)
On
Off
On
ON
(after
SMPS1 on)
On
On
DS8223A/B-04 April 2011
www.richtek.com
25
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