IL2931 SERIES
LOW DROPOUT VOLTAGE REGULATORS
The LM2931 series consists of positive fixed and
adjust-
able output voltage regulators that are specifically designed to maintain
proper regulation with an extremely low input-to-output voltage
differential. These devices are capable of supplying output currents in
excess of 100 mA and feature a low bias current of 0.4 mA at 10 mA
output.
Designed primarily to survive in the harsh automotive
environment, these devices will protect all external load circuitry from
battery jump starts, and excessive line transients during load dump.
This series also includes internal current limiting, thermal shutdown,
and additionally, is able to withstand temporary power-up with mirror-
image insertion.
Due to the low dropout voltage and bias current specifications,
the LM2931 series is ideally suited for battery powered industrial and
consumer equipment where an extension of useful battery life is
desirable. The ‘C’ suffix adjustable output regulators feature an output
inhibit pin which is extremely useful in microprocessor-based systems.
•
Input-to-Output Voltage Differential of Less Then 0.6 V at 100mA
•
Output Current in Excess of 100 mA
•
Low Bias Current
•
60 V Load Dump Protection
•
-50 V Reverse Transient Protection
Vin
•
Internal Current Limiting with Thermal Shutdown
•
Temporary Mirror-Image Protection
Ñ
0.1
µ
F
•
Ideally Suited for Battery Powered Equipment
*
in
TO-226AA /
TO-92
Pin 1. Output
2.Ground
3.Input
TO-220 AB
Pin 1. Input
2. Ground
3. Output
(Heatsink
surface connected
to Pin 2.)
Standard application
Vout
I L2931
Ñ
o**
100
µ
F
Ordering Information
Device
Il2931-5
Il2931-9
Output
Voltage
Tolerance
5.0 V
+5%
9.0 V
+5%
Package Case
Number
TO-226AA/TO92, TO-220AB
TO-226AA/TO92, TO-220AB
Value
40
60
-50
Internally Limited
178
83
Internally Limited
65
5.0
-40 to +125
-65 to +150
Unit
Vdc
Vpk
Vpk
Watts
°C/W
°C/W
Watts
°C/W
°C/W
°C
C
Maximum Ratings
Rating
Input Voltage Continuos
Transient Input Voltage (r
≤
100 ms)
Transient Reverse Polarity Input Voltage
1,0% Duty Cycle, r
≤
100 ms
Power Dissipation Case TO-220AA (TO-92)
TA
= +25
°C
Thermal Resistance Junction to Ambient
Thermal Resistance Junction to Case
Power Dissipation Case TO-220AB
TA
= +25
°C
Thermal Resistance Junction to Ambient
Thermal Resistance Junction to Case
Tested Operating Junction Temperature Range
Storage Temperature Range
Symbol
Vin
Vin(r)
-Vin(r)
PD
R
ΘJA
R
ΘJC
PD
R
ΘJC
R
ΘJC
TJ
Tstg
1
IL2931 SERIES
IL2931-5
Electrical characteristics
(Vin = 14V, Io = 10mA, Co = 100
µF,
Co(ESR) = 0.3
Ω,
TJ = +25
°C
Note 1, unless otherwise noted)
Characteristic
Fixed Output
Output Voltage
V
in
= 14 V, Io = 10 mA, T
J
= 25
°C
V
in
= 6.0 to 26 V, I
o
≤
100mA, T
J
= -40 to 125°C
Line Regulation
V
in
= 9.0 V to 16 V
V
in
= 6.0 V to 26 V
Load Regulation(Io = 5.0 mA to 100 m A)
Output Impedance
I
o
= 10 mA,
∆I
o
= 1.0 mA, f = 100 Hz to 10 kHz
Bias Current
V
in
= 14 V, I
o
= 100 mA, TJ = 25
°C
V
in
= 6.0 V to 26 V, I
o
= 10 mA, T
J
= -40 to +125
°C
Output Noise Voltage (f = 10 Hz to 100 rHzZ)
Long -Term Stability
Ripple Rejection (f = 120 Hz)
Dropout Voltage
Io=10A
Io=100A
Over -Voltage Shutdown Threshold
Output Voltage with Reverse Polarity Input
(Vin = -15 V)
IL2931-9
Electrical characteristics
(Vin = 16V, Io = 10 mA)
Symbol
V
o
Min
Typ
Max
Unit
Vcd
4.75
4.5
-
-
-
-
5.0
-
2.0
4.0
14
200
5.25
5.5
mV
10
30
50
-
mV
mΩ
mA
Reg
line
Reg
load
Zo
I
B
-
-
-
-
60
-
26
-0.3
5.8
0.4
700
20
90
0.015
0.06
29.5
0
30
1.0
-
-
-
0.2
0.6
40
-
µVrms
mV/kHz
dB
V
V
V
V
n
S
RR
V
in
-V
o
V
th(ov)
-V
o
Characteristic
Fixed Output
Output Voltage
V
in
= 16 V, I
o
= 10 mA, TJ = 25
°C
V
in
=10 to 26 V, I
o
≤
100mA, T
J
= -40 to +125°C
Line Regulation
V
in
= 9.0 V to 16 V
V
in
= 6.0 V to 26 V
Load Regulation(Io = 5.0 mA to 100 m A)
Output Impedance
I
o
= 10 mA,
∆I
o
= 1.0 mA, f = 100 Hz to 10 kHz
Bias Current
V
in
= 14 V, I
o
= 100 mA, T
J
= 25
°C
V
in
= 6.0 V to 26 V, I
o
= 10 mA, T
J
= -40 to +125
°C
Output Noise Voltage (f = 10 Hz to 100 rHzZ)
Long -Term Stability
Ripple Rejection (f = 120 Hz)
Dropout Voltage
Io=10A
Io=100A
Over - Voltage Shutdown Threshold
Output Voltage with Reverse Polarity Input
(V
in
= -15 V)
Symbol
V
o
Min
Typ
Max
Unit
Vcd
8.55
8.1
-
-
-
-
9.0
-
4.0
8.0
30
200
9.45
9.9
mV
20
60
100
-
mV
mΩ
mA
Reg
line
Reg
load
Z
o
I
B
-
-
-
-
60
-
26
-0.3
5.8
0.4
700
20
90
0.015
0.06
29.5
0
30
1.0
-
-
-
0.2
0.6
40
-
µVrms
mV/kHz
dB
V
V
V
V
n
S
RR
V
in
-V
o
V
th(ov)
-V
o
Note :
1.
Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambied as possible.
2
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