Package Pin Description
PIN SYMBOL
PACKAGE PIN #
FUNCTION
5Lead D2 PAK
1
VSENSE
Adjust
This Kelvin sense pin allows for remote sensing of the output
voltage at the load for improved regulation. It is internally
connected to the positive input of the voltage sensing error
amplifier.
2
This pin is connected to the low side of the internally trimmed
1% bandgap reference voltage and carries a bias current of
about 50µA. A resistor divider from Adj to VOUT and from Adj
to ground sets the output voltage. Also, transient response can
be improved by adding a small bypass capacitor from this pin
to ground.
3
4
VOUT
This pin is connected to the emitter of the power pass transistor
and provides a regulated voltage capable of sourcing 3A of
current.
VCONTROL
This is the supply voltage for the regulator control circuitry. For
the device to regulate, this voltage should be between 0.9V and
1.3V (depending on the output current) greater than the
output voltage. The control pin current will be about 1% of the
output current.
5
VPOWER
This is the power input voltage. The pin is physically connected
to the collector of the power pass transistor. For the device to
regulate, this voltage should be between 0.1V and 0.6V greater
than the output voltage, depending on output current. The out-
put load current of 3A is supplied through this pin.
Block Diagram
VPOWER
VCONTROL
BIAS
and
TSD
VREF
-
+
+
EA
IA
-
VOUT
VSENSE
Adjust
3
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
