Rainbow Electronics MAX17000 - Manual (Page 22)

MAX17000
Complete DDR2 and DDR3 Memory
Power-Management Solution
22 ______________________________________________________________________________________
OVP MODE REACTION/DRIVER STATE COMMENT
Shutdown
( SHDN = low)
DL immediately pulled low.
VTTR tracks the SMPS output during soft-shutdown. CSL and VTT
are high impedance at the end of soft-shutdown (16 discharge
MOSFETs disabled).
Outputs high-
impedance in
shutdown.
SMPS UVP
DL immediately pulled low.
VTTR tracks the SMPS output during soft-shutdown. CSL and VTT
are high impedance at the end of soft-shutdown (16 discharge
MOSFETs disabled).
SMPS latched fault
condition.
SMPS OVP
(disabled)
Controller remains active (normal operation).
Note: An OVP detection still pulls PGOOD1 low. Only PGOOD1 pulled
low; fault not latched.
VTT < -90% or
VTT > +110%
PGOOD2 immediately pulled low.
Soft-shutdown initiated if fault persists for more than 5ms (typ). DH
not used in soft-shutdown. DL low after soft-shutdown completed.
VTTR tracks the SMPS output soft-shutdown. VTT latched fault
condition if fault
persists for more
than 5ms (typ).
OVP Disabled
Discharge Disabled
(OVP = Low)
V
CC
UVLO
falling edge
DL and DH immediately pulled low.
PGOOD1 and PGOOD2 immediately forced low. VTT and VTTR
blocks immediately disabled (high impedance, no 16 discharge
on outputs).
—
Shutdown
( SHDN = low)
Soft-shutdown initiated.
DL high after soft-shutdown completed.
VTTR tracks the SMPS output during soft-shutdown. Internal 16
discharge MOSFETs on CSL and VTT enabled after soft-shutdown.
16 discharge
MOSFETs on CSL
and VTT enabled in
shutdown.
SMPS UVP
Soft-shutdown initiated. DH not used in soft-shutdown. DL low
after soft-shutdown completed.
VTTR tracks the SMPS output during soft-shutdown. Internal 16
discharge MOSFETs on CSL and VTT enabled after soft-shutdown.
SMPS latched fault
condition.
SMPS OVP
(enabled)
DL immediately latched high, DH forced low.
PGOOD1 and PGOOD2 immediately forced low.
VTT and VTTR blocks immediately shut down. Internal 16
discharge MOSFETs on CSL and VTT enabled.
SMPS latched fault
condition.
OVP Enabled
Discharge Enabled
(OVP = High)
VTT < 90% or
VTT > 110%
PGOOD2 immediately pulled low.
Soft-shutdown initiated if fault persists for more than 5ms (typ). DH
not used in soft-shutdown. DL low after soft-shutdown completed.
VTTR tracks the SMPS output during soft-shutdown. Internal 16
discharge MOSFETs on CSL and VTT enabled after soft-shutdown.
VTT latched fault
condition if fault
persists for more
than 5ms (typ).
OVP Enabled
Discharge Enabled
(OVP = High)
V CC UVLO
falling edge
DL and DH immediately pulled low.
PGOOD1 and PGOOD2 immediately forced low.
VTT and VTTR blocks immediately disabled.
Internal 16
discharge MOSFETs on CSL and VTT enabled
immediately.
—
Table 4. Fault Protection and Shutdown Setting Truth Table