Data Sheet

LM431A / LM431B / LM431C — Programmable Shunt Regulator
© 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM431A / LM431B / LM431C Rev. 1.2.0 3
Electrical Characteristics
Values are at T
A
= 25°C unless otherwise noted.
Note:
1. LM431xC: T
MIN
= -25°C, T
MAX
= +85°C.
LM431xI: T
MIN
= -40°C, T
MAX
= +85°C.
Symbol Parameter Conditions
LM431A LM431B LM431C
Unit
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
V
REF
Reference
Input Voltage
V
KA
= V
REF
,
I
KA
= 10 mA
2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508 V
ΔV
REF
/
ΔT
Deviation of
Reference
Input Voltage
Over-
Temperature
V
KA
= V
REF
,
I
KA
=10 mA
T
MIN
≤ T
A
≤ T
MAX
(1)
4.5 17.0 4.5 17.0 4.5 17.0 mV
ΔV
REF
/
ΔV
KA
Ratio of
Change in
Reference
Input Voltage
to the
Change in
Cathode
Voltage
I
KA
=
10 mA
ΔV
KA
=
10V-V
REF
-1.0 -2.7 -1.0 -2.7 -1.0 -2.7
mV / V
ΔV
KA
=
36V-10V
-0.5 -2.0 -0.5 -2.0 -0.5 -2.0
I
REF
Reference
Input Current
I
KA
= 10 mA,
R1 =10 kΩ, R2 = ∞
1.5 4.0 1.5 4.0 1.5 4.0
μA
ΔI
REF
/
ΔT
Deviation of
Reference
Input Current
Over Full
Temperature
Range
I
KA
= 10 mA,
R1 = 10 kΩ, R2 = ∞
T
A
= Full Range
0.4 1.2 0.4 1.2 0.4 1.2
μA
I
KA(MIN)
Minimum
Cathode
Cur-rent for
Regulation
V
KA
= V
REF
0.45 1.00 0.45 1.00 0.45 1.00 mA
I
KA(OFF)
Off - Stage
Cathode
Current
V
KA
= 36 V,
V
REF
= 0
0.05 1.00 0.05 1.00 0.05 1.00
μA
Z
KA
Dynamic
Impedance
V
KA
= V
REF
,
I
KA
=1 to 100 mA
f ≥ 1.0 kHz
0.15 0.50 0.15 0.50 0.15 0.50 Ω