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FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
MC34674 - Functional Block Diagram
Integrated Supply
Internal Supply & Reference
Sensing & Control
VIN Monitor
End of Charge
Charge Control
VIN - BAT Compare
Die Temperature Feedback
NTC Thermistor Interface
Logic
Logic Contro l
Status Indication
Power MOSFET
Integrated Supply
Sensing & Control
Logic
MOSFET
Figure 18. 34674 Functional Internal Block Diagram
INTEGRATED SUPPLY
conditions are reached, this block outputs a logic signal to
indicate the end of the charge.
INTERNAL SUPPLY AND REFERENCE
The internal supply and reference block steps down the
high input voltage to a lower voltage to power all the internal
control blocks. In addition, this block generates the reference
voltages for other functional blocks.
SENSING AND CONTROL
VIN MONITOR
The VIN monitor block monitors the input voltage for two
thresholds, power-on-reset (POR) and over-voltage
protection (OVP). If the input is lower than the POR or higher
than the OVP threshold, this block outputs a logic signal to
disable the charger.
CHARGE CONTROL
The charge-control block controls the gate voltage of the
power MOSFET to regulate the charge current, the battery
voltage, or the die temperature. It can also completely turn off
the power MOSFET to stop the current flow between the
input and the battery.
EOC (END OF CHARGE)
The EOC block monitors the charge current and the
VIN-BAT COMPARATOR
The VIN-BAT comparator monitors the voltage difference
between the input voltage V IN and the battery voltage V BAT ,
as shown in Figure 2 . The input voltage has to be higher than
the battery voltage for the charger to be enabled. If the input
voltage falls below the battery voltage, this block outputs a
signal to disable the charger to prevent the leakage current
from the battery to the input. Due to the intrinsic input offset
voltage of the VIN-BAT comparator, a small voltage, V OS , is
added. The added V OS guarantees that the power MOSFET
is turned off when the input voltage is lower than the battery
voltage.
DIE TEMPERATURE FEEDBACK
The die temperature feedback block monitors the die
temperature. Once the die temperature reaches a threshold
of 110°C, the charge-control block can reduce the charge
current to prevent further temperature rise.
NTC INTERFACE
The NTC interface block offers an interface to an external
NTC thermistor circuit to monitor the battery temperature and
to set the charge temperature window.
battery voltage for the EOC conditions. Once the EOC
34674
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
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