LM2596

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3

PIN FUNCTION DESCRIPTION

Pin

Symbol

Description (Refer to Figure 1)

1

This pin is the positive input supply for the LM2596 step−down switching regulator. In order to minimize voltage transi-

ents and to supply the switching currents needed by the regulator, a suitable input bypass capacitor must be present

2

Output

kept in mind that the PCB area connected to this pin should be kept to a minimum in order to minimize coupling to

sensitive circuitry.

3

GND

Circuit ground pin. See the information about the printed circuit board layout.

4

Feedback This pin is the direct input of the error amplifier and the resistor network R2, R1 is connected externally to allow pro-

gramming of the output voltage.

5

ON/OFF

It allows the switching regulator circuit to be shut down using logic level signals, thus dropping the total input supply

current to approximately 80 mA. The threshold voltage is typically 1.6 V. Applying a voltage above this value (up to

will be in the “on” condition.

specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.)

Rating

Symbol

Value

Unit

Operating Junction Temperature Range

−40 to +125

°C

Supply Voltage

4.5 to 40

V