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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
DS005254-6
Front View
TO-263 Surface-Mount Package
DS005254-11
Top View
DS005254-12
Side View
8-Pin Surface Mount
DS005254-7
*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
DS005254-8
Bottom View
March 2000
LM2931Series
Low
Dropout
Regulators
2000 National Semiconductor Corporation
DS005254
www.national.com
Connection Diagrams
(Continued)
ADJUSTABLE OUTPUT VOLTAGE
6-Bump micro SMD
DS005254-38
Top View
(Bump Side Down)
micro SMD Laser Mark
DS005254-39
TO-220 5-Lead Power Package
DS005254-9
Front View
TO-263
5-Lead Surface-Mount Package
DS005254-13
Top View
DS005254-14
Side View
8-Pin Surface Mount
DS005254-10
Top View
LM2931
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2
Connection Diagrams
(Continued)
Ordering 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
BPA06HTA
Note: The micro SMD package marking is a single digit manufacturing Date Code Only.
LM2931
www.national.com
3
Typical Applications
LM2931 Fixed Output
DS005254-4
*
Required if regulator is located far from power supply filter.
*
*C2 must be at least 100 F 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
DS005254-5
Note: Using 27k for R1 will automatically compensate for errors in V
OUT
due to the input bias current of the ADJ pin (approximately 1 A).
LM2931
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4
Absolute 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
(Note 2) (Note 4)
Internally Limited
Operating Ambient Temperature
Range
-40C to +85C
Maximum Junction Temperature
125C
Storage Temperature Range
-65C to +150C
Lead Temp. (Soldering, 10 seconds)
230C
ESD Tolerance (Note 5)
2000V
Electrical Characteristics for Fixed 3.3V Version
V
IN
= 14V, I
O
= 10mA, T
J
= 25C, C
2
= 100F (unless otherwise specified) (Note 2)
Parameter
Conditions
LM2931-3.3
Units
Typ
Limit
(Note 3)
Output Voltage
3.3
3.465
3.135
V
MAX
V
MIN
4V
V
IN
26V, I
O
= 100 mA
-40C
T
J
125C
3.630
2.970
V
MAX
V
MIN
Line Regulation
4V
V
IN
26V
4
33
mV
MAX
Load Regulation
5mA
I
O
100mA
10
50
mV
MAX
Output Impedance
100mA
DC
and 10mA
rms
,
100Hz - 10kHz
200
m
Quiescent Current
I
O
10mA, 4V
V
IN
26V
0.4
1.0
mA
MAX
-40C
T
J
125C
I
O
= 100mA, V
IN
= 14V, T
J
= 25C
15
mA
Output Noise Voltage
10Hz -100kHz, C
OUT
= 100F
330
V
rms
Long Term Stability
13
mV/1000 hr
Ripple Rejection
f
O
= 120Hz
80
dB
Dropout Voltage
I
O
= 10mA
I
O
= 100mA
0.05
0.30
0.2
0.6
V
MAX
Maximum Operational
Input Voltage
33
26
V
MIN
Maximum Line Transient
R
L
= 500
, V
O
5.5V,
T = 1ms,
100ms
70
50
V
MIN
Reverse Polarity Input
Voltage, DC
V
O
-0.3V, R
L
= 500
-30
-15
V
MIN
Reverse Polarity Input
Voltage, Transient
T = 1ms,
100ms, R
L
= 500
-80
-50
V
MIN
Electrical Characteristics for Fixed 5V Version
V
IN
= 14V, I
O
= 10mA, T
J
= 25C, C2 = 100 F (unless otherwise specified) (Note 2)
Parameter
Conditions
LM2931A-5.0
LM2931-5.0
Units
Typ
Limit
(Note 3)
Typ
Limit
(Note 3)
Output Voltage
5
5.19
4.81
5
5.25
4.75
V
MAX
V
MIN
6.0V
V
IN
26V, I
O
= 100mA
-40C
T
J
125C
5.25
4.75
5.5
4.5
V
MAX
V
MIN
Line Regulation
9V
V
IN
16V
6V
V
IN
26V
2
4
10
30
2
4
10
30
mV
MAX
Load Regulation
5 mA
I
O
100mA
14
50
14
50
mV
MAX
Output Impedance
100mA
DC
and 10mA
rms
,
100Hz -10kHz
200
200
m
LM2931
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5