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National Semiconductor
National Semiconductor

LM2931CT Datasheet

Series Low Dropout Regulators


LM2931CT Datasheet Preview


March 2000
LM2931
Series Low Dropout Regulators
General Description
The LM2931 positive voltage regulator features a very low
quiescent current of 1mA or less when supplying 10mA
loads. This unique characteristic and the extremely low
input-output differential required for proper regulation (0.2V
for output currents of 10mA) make the LM2931 the ideal
regulator for standby power systems. Applications include
memory standby circuits, CMOS and other low power pro-
cessor power supplies as well as systems demanding as
much as 100mA of output current.
Designed originally for automotive applications, the LM2931
and all regulated circuitry are protected from reverse battery
installations or 2 battery jumps. During line transients, such
as a load dump (60V) when the input voltage to the regulator
can momentarily exceed the specified maximum operating
voltage, the regulator will automatically shut down to protect
both internal circuits and the load. The LM2931 cannot be
harmed by temporary mirror-image insertion. Familiar regu-
lator features such as short circuit and thermal overload pro-
tection are also provided.
The LM2931 family includes a fixed 5V output (±3.8% toler-
ance for A grade) or an adjustable output with ON/OFF pin.
Both versions are available in a TO-220 power package,
TO-263 surface mount package, and an 8-lead surface
mount package. The fixed output version is also available in
the TO-92 plastic and 6-Bump micro SMD packages.
Features
n Very low quiescent current
n Output current in excess of 100 mA
n Input-output differential less than 0.6V
n Reverse battery protection
n 60V load dump protection
n −50V reverse transient protection
n Short circuit protection
n Internal thermal overload protection
n Mirror-image insertion protection
n Available in TO-220, TO-92, TO-263, SO-8 or 6-Bump
micro SMD packages
n Available as adjustable with TTL compatible switch
n See AN-1112 for micro SMD considerations
Connection Diagrams
FIXED VOLTAGE OUTPUT
TO-220 3-Lead Power Package
TO-263 Surface-Mount Package
Front View
DS005254-6
8-Pin Surface Mount
DS005254-11
Top View
DS005254-12
Side View
TO-92 Plastic Package
DS005254-7
*NC = Not internally connected. Must be electrically isolated from the rest
of the circuit for the micro SMD package.
Top View
DS005254-8
Bottom View
© 2000 National Semiconductor Corporation DS005254
www.national.com
Page 1

Connection Diagrams (Continued)
6-Bump micro SMD
micro SMD Laser Mark
DS005254-38
Top View
(Bump Side Down)
ADJUSTABLE OUTPUT VOLTAGE
TO-220 5-Lead Power Package
DS005254-39
TO-263
5-Lead Surface-Mount Package
Front View
DS005254-9
8-Pin Surface Mount
DS005254-13
Top View
DS005254-14
Side View
DS005254-10
Top View
www.national.com
2
Page 2

Connection Diagrams (Continued)
Ordering Information
Output
Package
Part Number
Package Marking
Number
5V
3-Pin TO-220
LM2931T-5.0
LM2931T-5.0
LM2931AT-5.0
LM2931AT-5.0
3-Pin TO-263
LM2931S-5.0
LM2931S-5.0
LM2931AS-5.0
LM2931AS-5.0
TO-92
LM2931Z-5.0
LM2931Z-5
LM2931AZ-5.0
LM2931AZ
8-Pin
SOIC
LM2931M-5.0
LM2931AM-5.0
2931M-5.0
2931AM-5.0
* 6-Bump
micro SMD
LM2931IBPX-5.0
-
Adjustable,
3V to 24V
5-Pin TO-220
5-Pin TO-263
LM2931CT
LM2931CS
LM2931CT
LM2931CS
8-Pin
SOIC
LM2931CM
LM2931CM
3.3V
* 6-Bump
micro SMD
LM2931IBPX-3.3
-
Note: The micro SMD package marking is a single digit manufacturing Date Code Only.
Transport Media
Rails
Rails
Rails
Rails
1.8k Units per Box
1.8k Units per Box
Rails
Rails
Tape and Reel
Rails
Rails
Rails
Tape and Reel
NSC
Drawing
T03B
TS3B
Z03A
M08A
BPA06HTA
T05A
TS5B
M08A
BPA06HTA
3 www.national.com
Page 3
Part Number LM2931CT
Manufactur National Semiconductor
Description Series Low Dropout Regulators
Total Page 18 Pages
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