Data Sheet

LM431SA / LM431SB / LM431SC — Programmable Shunt Regulator
Electrical Characteristics
(6)
Values are at T
A
= 25°C unless otherwise noted.
Note:
6. T
MIN
= -25°C, T
MAX
= +85°C.
Symbol Parameter Conditions
LM431SA LM431SB LM431SC
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
Δ V
REF
/ Δ T
Deviation of
Reference
Input Voltage
Over-
Temperature
V
KA
= V
REF
,
I
KA
= 10 mA
T
MIN
≤ T
A
≤
T
MAX
SOT-89
SOT-23F
4.5 17.0 4.5 17.0 4.5 17.0 mV
SOT-23 6.6 24 6.6 24 6.6 24 mV
Δ V
REF
/
Δ V
KA
Ratio of Change
in Reference
Input Voltage
to the Change in
Cathode Voltage
I
KA
=10 mA
Δ V
KA
=
10 V-V
REF
-1.0 -2.7 -1.0 -2.7 -1.0 -2.7
mV/V
Δ V
KA
=
36 V-10 V
-0.5 -2.0 -0.5 -2.0 -0.5 -2.0
I
REF
Reference Input
Current
I
KA
= 10 mA,
R
1
= 10 KΩ, R
2
= ∞
1.5 4.0 1.5 4.0 1.5 4.0 μA
Δ I
REF
/ Δ T
Deviation of
Reference
Input Current
Over Full
Temperature
Range
I
KA
= 10 mA,
R
1
= 10 KΩ,
R
2
= ∞,
T
A
= Full
Range
SOT-89
SOT-23F
0.4 1.2 0.4 1.2 0.4 1.2 μA
SOT-23 0.8 2.0 0.8 2.0 0.8 2.0 μA
I
KA(MIN)
Minimum
Cathode Current
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
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