mc33291l Freescale Semiconductor, Inc, mc33291l Datasheet - Page 15

• Manufacturer Part Number: mc33291l
• Description: Eight-output Switch With Serial Peripheral Interface I/o
• Manufacturer: Freescale Semiconductor, Inc

POWER CONSUMPTION
the operating and standby modes. In the standby, or Sleep,
mode, with V
pin is less than 25 µA. In the operating mode, the current
drawn by the VDD pin is less than 4.0 mA (1.0 mA typical)
while the current drawn at the VPWR pin is 2.0 mA maximum
(1.0 mA typical). During normal operation, turning outputs
ON increases I
experiencing a soft short (overcurrent conditions just under
the current limit) adds 0.5 mA to the I
PARALLELING OF OUTPUTS
any combination of outputs together. R
have an inherent positive temperature coefficient providing
balanced current sharing between outputs without
destructive operation (bipolar outputs could not be paralleled
in this fashion as thermal run-away would likely occur). The
device can even be operated with all outputs tied together.
This mode of operation may be desirable in the event the
Analog Integrated Circuit Device Data
Freescale Semiconductor
The 33291L has extremely low power consumption in both
Using MOSFETs as output switches permits connecting
DD
PWR
≤ 2.0 V, the current consumed by the VPWR
by only 20 µA per output. Each output
PWR
DS(ON)
current
of MOSFETs
application requires lower power dissipation or the added
capability of switching higher currents.
corresponding decrease in R
Open Load Detect Currents and the Output Current Limits
increase correspondingly (by a factor of eight if all outputs are
paralleled). Less than 125 mΩ R
limiting of 8 A to 24 A will result if all outputs are paralleled
together. There will be no change in the overvoltage detect or
the OFF output threshold voltage range. The advantage of
paralleling outputs within the same 33291L affords the
existence of minimal R
variation between outputs.
same device is less than 0.5 percent. The variation in clamp
voltages, potentially affecting dynamic current sharing, is less
than five percent. Paralleling outputs from two or more
different devices is possible, but it is not recommended.
There is no guarantee the R
two devices will match. System level thermal design analysis
and verification should be conducted whenever paralleling
outputs, particularly where different devices are involved.
Performance of parallel operation results in a
Typically, the variation of R
DS(ON)
DS(ON)
DS(ON)
and output clamp voltage
DS(ON)
DS(ON)
FUNCTIONAL DESCRIPTION
and clamp voltage of the
while the Output OFF
between outputs of the
at 25°C with current
33291L
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