Datasheet

LP38842
SNVS291C –DECEMBER 2004–REVISED APRIL 2013 www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
CONNECTION DIAGRAM
Figure 1. TO-220, Top View Figure 2. DDPAK/TO-263, Top View
Pin DESCRIPTIONS
Pin Name Description
BIAS The bias pin is used to provide the low current bias voltage to the chip which operates the internal circuitry and
provides drive voltage for the N-FET.
OUTPUT The regulated output voltage is connected to this pin.
GND This is both the power and analog ground for the IC. Note that both pin three and the tab of the TO-220 and
DDPAK/TO-263 packages are at ground potential. Pin three and the tab should be tied together using the PC board
copper trace material and connected to circuit ground.
INPUT The high current input voltage which is regulated down to the nominal output voltage must be connected to this pin.
Because the bias voltage to operate the chip is provided separately, the input voltage can be as low as a few hundred
millivolts above the output voltage.
SHUTDOWN This provides a low power shutdown function which turns the regulated output OFF. Tie to V
BIAS
if this function is not
used.
BLOCK DIAGRAM
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