July 2008

Rev 18

1/23

23

LM2931XX - LM2931AXX33

LM2931AXX50 - LM2931BXX50

Very low drop voltage regulators with inhibit function

Features

load)

load)

fixed (3.3 V & 5 V) output voltage version

inhibit control)

Description

The LM2931xx are very low drop regulators. The

very low drop voltage and the low quiescent

current make them particular suitable for low

noise, low power applications and in battery

powered systems. In the 8 pin configuration (SO-

8), fully compatible to the older L78Lxx family, a

shut down logic control function is available.

This means that when the device is used as a

local regulator is possible to put a part of the

board in stand-by decreasing the total power

consumption. Ideal for automotive application the

LM2931xx is protected from reverse battery

installations or 2 battery jumps. During the

transient, such as a a load dump (60 V) when the

input voltage can exceed the specified maximum

operating input voltage (26 V), the regulator will

automatically shut down to protect both internal

circuit and the load.

TO-92

DPAK

SO-8

Table 1.

Device summary

Order codes

Output voltage

Packages

DPAK

TO-92 (BAG)

SO-8

LM2931AZ33R

LM2931AD33R

3.3 V

LM2931ADT50R

LM2931AZ50R

LM2931AD50R

5.0 V

LM2931BZ50R

LM2931BZ50AP

LM2931BD50R

5.0 V

LM2931D-R

2.5 to 26 V

1.

Please note that in these cases pins are shaped according to tape & reel specifications.

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