LP38841

SNVS289B – DECEMBER 2004 – REVISED SEPTEMBER 2006

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Connection Diagram

Figure 1. TO-220, Top View

Figure 2. TO-263, Top View

Pin Functions

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 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 seperately, the input voltage can be as low as a

few hundered millivolts above the output voltage.

SHUTDOWN

not used.

Block Diagram

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.

2

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