MCZ34653EF Ver la hoja de datos (PDF) - Freescale Semiconductor
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MCZ34653EF Datasheet PDF : 24 Pages
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FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
POWER GOOD OUTPUT (ACTIVE LOW) PG
The PG pin is the active low power good output signal that
is used to enable or disable a load. This signal goes active
after a successful power-up sequence and stays active as
long as the device is in normal operation and is not
experiencing any faults.
The signal is deactivated under the following conditions:
• Power is turned off.
• The device is disabled for more than 1.0 ms.
• The device exceeded its thermal shutdown threshold for
more than 12 µs.
• The device is in overvoltage or undervoltage mode for
more than 1.0 ms.
• Load current exceeded the overcurrent limit for more than
3.0 ms.
This pin is referenced to VIN.
OUTPUT VOLTAGE (VOUT)
The VOUT pin is the drain of the internal Power MOSFET
and supplies a current-limited voltage to the load. The load
connects between the VOUT and VPWR pins.
POSITIVE SUPPLY VOLTAGE INPUT (VPWR)
The VPWR pin is the most-positive power supply input.
The load connects between the VPWR and VOUT pins.
DISABLE INPUT CONTROL (DISABLE)
The DISABLE pin is used to easily disconnect or connect
the load from the main power line by disabling or enabling the
34653. It can also be used to reset the fault conditions that
cause a “Power No Good” signal.
If left open or connected to VPWR, the DISABLE pin is
inactive and the device is enabled. If a positive voltage
(above VPWR) or a negative voltage (below VPWR) is applied
to DISABLE, it is active and the device is disabled. The
disable function has a 1.0 ms filter timer.
This pin is referenced to VPWR.
CURRENT LIMIT CONTROL (ILIM)
The ILIM pin is used to set the overcurrent limit during
normal operation. This pin can be left unconnected for a
default overcurrent limit value of 1.0 A or the user can
connect an external resistor between the ILIM and VIN pins
to set the overcurrent limit value. This value can vary
between 0.15 A and 1.25 A. The overcurrent detection circuit
has a 100 µs filter timer.
CHARGING CURRENT LIMIT CONTROL (ICHG)
The ICHG pin is used to set the current limit that is used to
charge the load’s input capacitor, hence limiting the inrush
current to a known constant value. This pin can be left
unconnected for a default charging current limit value of 0.1 A
and a default ICHG rise time of 1.0 ms. Or the user can
connect an external resistor between the ICHG and VIN pins
to set the current limit value between 0.05 A and 0.5 A and an
external capacitor to increase the ICHG rise time. The
recommended maximum rise time is 10 ms.
Analog Integrated Circuit Device Data
Freescale Semiconductor
34653
9
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