LP38843_15 Datasheet, PDF (2/17 Pages) Texas Instruments – 3A Ultra Low Dropout Linear Regulators Stable with Ceramic Output Capacitors

LP38843
SNVS290C – DECEMBER 2004 – REVISED APRIL 2013
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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 Name
BIAS
OUTPUT
GND
INPUT
SHUTDOWN
PIN DESCRIPTIONS
Description
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.
The regulated output voltage is connected to this pin.
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.
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.
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
2
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