型号：LM2931AMX-5.0
品牌：TI(NS)
封装：SOP-8
数量:20000(10盘)
LM2931AMX-5.0 DATASHEET
June 2005
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 cur-
rents of 10mA) make the LM2931 the ideal regulator for
standby power systems. Applications include memory stand-
by circuits, CMOS and other low power processor 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
■ Very low quiescent current
■ Output current in excess of 100 mA
■ Input-output differential less than 0.6V
■ Reverse battery protection
■ 60V load dump protection
■ −50V reverse transient protection
■ Short circuit protection
■ Internal thermal overload protection
■ Mirror-image insertion protection
■ Available in TO-220, TO-92, TO-263, SO-8 or 6-Bump mi-
cro SMD packages
■ Available as adjustable with TTL compatible switch
■ See AN-1112 for micro SMD considerations
Connection Diagrams
FIXED VOLTAGE OUTPUT
TO-220 3-Lead Power Package
525406
Front View
TO-263 Surface-Mount Package
525411
Top View
525412
Side View
8-Pin Surface Mount
525407
*NC = Not internally connected. Must be electrically isolated from the rest of
the circuit for the micro SMD package.
Top View
TO-92 Plastic Package
525408
Bottom View
© 2006 National Semiconductor Corporation 5254 www.national.com
LM2931 Series Low Dropout Regulators6-Bump micro SMD
525438
Top View
(Bump Side Down)
micro SMD Laser Mark
525439
ADJUSTABLE OUTPUT VOLTAGE
TO-220 5-Lead Power Package
525409
Front View
TO-263
5-Lead Surface-Mount Package
525413
Top View
525414
Side View
8-Pin Surface Mount
525410
Top View
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LM2931Ordering Information
Output
Number
Package Part Number Package Marking Transport Media NSC Drawing
5V 3-Pin TO-220 LM2931T-5.0 LM2931T-5.0 Rails T03B
LM2931AT-5.0 LM2931AT-5.0 Rails
3-Pin TO-263 LM2931S-5.0 LM2931S-5.0 Rails TS3B
LM2931AS-5.0 LM2931AS-5.0 Rails
TO-92 LM2931Z-5.0 LM2931Z-5 1.8k Units per Box Z03A
LM2931AZ-5.0 LM2931AZ 1.8k Units per Box
8-Pin
SOIC
LM2931M-5.0 2931M-5.0 Rails M08A
LM2931AM-5.0 2931AM-5.0 Rails
* 6-Bump
micro SMD
LM2931IBPX-5.0 ‐ Tape and Reel BPA06HTA
Adjustable,
3V to 24V
5-Pin TO-220 LM2931CT LM2931CT Rails T05A
5-Pin TO-263 LM2931CS LM2931CS Rails TS5B
8-Pin
SOIC
LM2931CM LM2931CM Rails M08A
3.3V * 6-Bump
micro SMD
LM2931IBPX-3.3 ‐ Tape and Reel BPA06HTB
Note: The micro SMD package marking is a single digit
manufacturing Date Code Only.
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LM2931Typical Applications
LM2931 Fixed Output
525404
*Required if regulator is located far from power supply filter.
**C2 must be at least 100 μF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to the
regulator. This capacitor must be rated over the same operating temperature range as the regulator. The equivalent series resistance (ESR) of this capacitor is
critical; see curve.
LM2931 Adjustable Output
525405
Note: Using 27k for R1 will automatically compensate for errors in VOUT due to the input bias current of the ADJ pin (approximately 1 μA).
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LM2931Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage
Operating Range 26V
Overvoltage Protection
LM2931A, LM2931C (Adjustable) 60V
LM2931 50V
Internal Power Dissipation
(Notes 2, 4) Internally Limited
Operating Ambient Temperature
Range −40°C to +85°C
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