LND 5201
The* denotes the specifications which apply over the full temperature range.
Note 1: Unless otherwise specified Vout=Vsense. For LND5201 (adj.) Vadj=0V
Note 2: For the adjustable device the minimum load current is the minimum current required to maintain regulation.
Normally the current in the resistor divider used to set the output voltage is selected to meet the minimum load current
requirement.
Note 3: The control pin current is the drive current required for the output transistor. This current will track output with
a ratio of about 1:100.
Note 4: The dropout voltage for the LND5201 is caused by either minimum control voltage or minimum power voltage.
The specifications represent the minimum input/output voltage required to maintain 1% regulation.
PIN FUNCTIONS (5-LEAD)
Sense (Pin 1):
This pin is the positive
side of the reference voltage. With this
pin it is possible to Kelvin sense the
output voltage at the load.
Adjust (Pin 2):
This pin is the negative
side of the reference voltage. Adding a
small bypass capacitor from the Adjust
pin to ground improves the transient
response. For fixed voltage devices the
Adjust pin is also brought out to allow
the user to add a bypass capacitor.
GND (Pin 2):
For fixed voltage devices
this is the bottom of the resistor divider
that sets the output voltage.
V
power
(Pin 5):
This pin is the collector
of the power transistor. The output
load current is supplied through this
pin. The voltage at this pin must be
0.7V greater than the output voltage
for the device to regulate.
V
control
(pin 4):
This pin is the supply
pin for the control circuitry. The
current flow into this pin will be about
1% of the output current. The voltage
at this pin must be 1.3V greater than
the output voltage for the device to
regulate.
Output (Pin 3):
This is the power
output of the device.
BLOCK DIAGRAM
•
Linear Dimensions, Inc.
•
445 East Ohio Street, Chicago IL 60611 USA
•
tel 312.321.1810
•
fax 312.321.1830
•
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