SMT4214 Summit Microelectronics, Inc., SMT4214 Datasheet - Page 3

• Manufacturer Part Number: SMT4214
• Description: Expandable Four-rail Supply TRAKKER™ Controller
• Manufacturer: Summit Microelectronics, Inc.

POWER-ON
PWR_ON# pin low. This pin can either be hardwired
low for an automatic power-on or it can be pulled low
after the device receives power. This pin can also be
pulled low using an I
begins the power-on operation. FS# must be high; if
FS# is low, the SMT4214 will not power on.
SEATED# pin must also be low for the seated delay
interval, t
SMT4214 will wait until all of the VI’s for the
designated soft start channels have reached their
programmed thresholds.
outputs of the soft start channels will ramp up and turn
on their corresponding card-side voltages. When the
VGATE outputs of the soft start channels have ramped
above their programmed output voltage levels (P
10.5V or 14.5V) and the respective card-side voltages
are above their programmed or fixed offset thresholds,
soft start is complete.
wait until all of the VI’s of the tracking channels are
above their programmed thresholds and then begin
tracking.
VGATE outputs of the tracking channels ramp up to
their maximum voltage.
Summit Microelectronics, Inc
RST#
IR Q _C LR #
MR#
VI or VO
VO
The power-on operation is initiated by taking the
Two conditions must be met before the part
Once the power-on operation is initiated the
Once the soft start is complete the SMT4214 will
RST#
IR Q #
SEATED
The tracking operation ends when the
, before the device will power on.
2
C power-on command.
Figure 3. Timing relation between VI/VO, IRQ#, IRQ_CLR# and RST#
t
P
PRTO
VIT
t
At this point the VGATE
DUVIR
Figure 2. Timing relation between VO, RST# and MR#
t
DUVRS
VVG
The
2061 1.0 8/16/02
=
P
VIT
above their minimum programmed output voltage)
within a power-on limit interval (t
and tracking operations will cease and FS# will be
asserted, shutting down all VGATE outputs. After this
shutdown, the device will not perform a power-on
operation until the PWR_ON# pin is toggled.
POWER-OFF
operation, the power-off operation can be initiated by
bringing the PWR_ON# pin high.
toggled high either externally or internally with an IIC
power-off command.
a delay of t
SMT4214 will begin the discharging of the VGATE
output of the highest tracked channel. Once the VO
inputs of all tracked channels are within 50mV of
ground, all VGATE outputs will be clamped to ground.
RESET OPERATION (See Figure 2)
all selected managers detect their respective VO is at
or above the programmed threshold and the tracking
function is complete. RST# will remain active for the
reset timeout period (t
its programmed threshold and the tracking function is
complete.
t
PRTO
If power-on is not completed (all VGATE outputs
During power-on the RST# output will be low until
t
Once the SMT4214 has completed the power-on
Once the power-off operation is initiated there is
DMRRS
t
DCLIR
TRK_DN
= VDD/500V/s. At this point the
PRTO
) after the last VO reaches
t
Preliminary Information
PRTO
PWRON
SMT4214
This pin can be
t
PRTO
), the soft start
3