LM2931-5.0
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
can
not be harmed by temporary mirror-image insertion. Familiar
regulator features such as short circuit and thermal overload
protection are also provided.
Fixed output of 5V is available in the plastic
the popular TO-92 package.
he
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 in-put-
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 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,
TO-92
!"
!"
!"
!"
!"
!"
!"
!"
!"
!"
!"
!"
#
+
!
Pin : 1. Output
2. Ground
3. Input
LM2931Z-5.0
LM2931AZ-5.0
5V
5V
TO-92
TO-92
1-6
2000/05 VER.A
LM2931-5.0
Input Voltage
Operating Range
Overvoltage Protection
LM2931
26V
50V
Internal Power Dissipation(Note 1)
Operating Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Lead Temp.(Soldering, 10 seconds)
Internally Limited
0
70
125
to
+150
210
(V
=14V,Io=10mA, T
=25(Note 1), C2=100F(unless otherwise specified)
''
(
LM
LM
!"#$%&
5
)
V
V
V
V
mV
mV
mV
m!
mA
mA
mA
mA
Output Voltage
6.0V V
26V,
Io 100mA
-40 Tj 125
9V V
16V
6V V
26V
5mA
100mA
100mA
and 10mArms,
100Hz-10KHz
26V
-40 Tj 125
Io=100mA,V
=14V,Tj=25
10Hz-100KHz, C
=100
F
5
5.19
4.81
5.25
4.75
5.25
4.75
5.5
4.5
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
2
4
14
200
0.4
15
500
20
10
30
50
600
1.0
1.0
30
5
1000
50
2
4
14
200
0.4
15
500
20
10
30
50
1.0
1.0
Output Noise
Voltage
Long Term
Stability
Ripple Rejection
Dropout Voltage
fo=120Hz
Io=10mA
Io=100mA
80
,
55
0.2
0.6
80
,
Maximum
Operational Input
26
Voltage
Maximum Line
R
=500 5.5V,100ms
70
60
Transient
Reverse Polarity
-30
-15
Vo -0.3V, R
=500!
Input Voltage,DC
Reverse Polarity
=500!
Input Voltage,
-80
-50
Transient
Note 1:To ensure constant junction temperature, low duty cycle pulse testing is used.
Note 2:Guaranteed and 100% production tested.
0.3
33
0.3
33
0.2
0.6
26
mV
/1000hr
dB
V
V
V
V
V
70
-30
50
-15
V
-80
-50
V
Note 3:Guaranteed (but not 100% production tested)over the operating temperature and input current ranges. These limits are
not used to calculate outgoing quality levels.
Note 4:Thermal resistance junction-to-case (jc) is 3/W; case-to-ambient is 50/W.
2-6
LM2931-5.0
V
=14V,V
=3V,I
=10 mA, T
=25(Note 1), R1=27K,C2=100"F(unless otherwise specified)
''
Reference Voltage
R1=27K
Measured from V
to Adjust Pin
Output Voltage
Range
Line Regulation
Load Regulation
Output Impedance
Quiescent Current
V
+0.6V V
26V
5mA Io 100mA
100mA
and 10mArms 100Hz-10KHz
Io=10mA
Io=100 mA
During Shutdown R
=500!
Output Noise Voltage
Long Term Stability
Ripple Rejection
Dropout Voltage
Maximum Operational
Input Voltage
Maximum Line Transient
Reverse Polarity Input
Voltage, DC
Reverse Polanty Input
Voltage Transient
On/Off Threshold Voltage Vo=3V
On
Off
On/Off Threshold Current
(
*+
1.20
1.26
1.14
1.32
1.08
24
3
)
V
V
V
V
V
V
mV /V
%MAX
!/V
0.2
0.3
40
0.4
15
0.8
100
"
1.5
1
1
1
mA
mA
mA
Vrms/V
%/1000hr
%/V
10Hz-100KHz
fo=120Hz
Io 10 mA
Io=100 mA
0.02
0.05
0.3
33
0.2
0.6
26
60
-15
-50
1.2
3.25
50
V
V
V
V
V
V
V
V
A
Io=10 mA, Reference Voltage 1.5V
Vo -0.3V,R
=500!
70
-30
=500!
-80
2.0
2.2
20
3-6
LM2931-5.0
*+, '-' ,.',',
'+
!
! !"
"
"
"
"
#
$%&
' !
! !"
"
"
4-6
LM2931-5.0
*+, '-' ,.',',/ (0
!)
'
*
#
*
#
())%%
'
+-
+,
LM
"
"
"
1Required
if regulator
located far from
is
1Required
if regulatoris located far from
power supply filter.
R1+R2
**C
must be at least 22"F
to maintain
V
=Reference Voltage
stability. May be increased without
R1
bound to maintain regulation during
transients. Locate as close as possible to
Note:Using
28K
for
R1
will
for errors in the regulator.This capacitor must be rated
automatically compensate
V
due to the input bias current of the temperature range as the regulator. The
the same
equivalent series over
ADJ pin(approximately 1"A)
operating should resistance(ESR) of this
capacitor be less than 1 over the
t d
ti t
t
"
++( ,
5-6
单片机
