NCP431A, SC431A,
NCP431B, NCP432B Series
Programmable Precision
References
The NCP431/NCP432 integrated circuits are three−terminal
programmable shunt regulator diodes. These monolithic IC voltage
references operate as a low temperature coefficient zener which is
programmable from Vref to 36 V using two external resistors. These
devices exhibit a wide operating current range of 40
mA
to 100 mA
with a typical dynamic impedance of 0.22
W.
The characteristics of
these references make them excellent replacements for zener diodes in
many applications such as digital voltmeters, power supplies, and op
amp circuitry. The 2.5 V reference makes it convenient to obtain a
stable reference from 5.0 V logic supplies, and since the NCP431/
NCP432 operates as a shunt regulator, it can be used as either a
positive or negative voltage reference. Low minimum operating
current makes this device an ideal choice for secondary regulators in
SMPS adapters with extremely low no−load consumption.
Features
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12
TO−92
LP SUFFIX
CASE 29−11
Pin 1. Reference
2. Anode
3. Cathode
3
8
1
Cathode
Anode
Anode
NC
(Top View)
1
SOIC−8 NB
D SUFFIX
CASE 751
Reference
Anode
Anode
NC
•
Programmable Output Voltage to 36 V
•
Low Minimum Operating Current: 40
mA,
Typ @ 25°C
•
Voltage Reference Tolerance:
±0.5%,
Typ @ 25°C
•
•
•
•
•
•
•
•
•
•
•
(NCP431B/NCP432B)
Low Dynamic Output Impedance, 0.22
W
Typical
Sink Current Capability of 40
mA
to 100 mA
Equivalent Full−Range Temperature Coefficient of 50 ppm/°C
Typical
Temperature Compensated for Operation over Full Rated Operating
Temperature Range
SC Prefix for Automotive and Other Applications Requiring Unique
Site and Control Change Requirements; AEC−Q100 Qualified and
PPAP Capable
These are Pb−Free Devices
Voltage Adapters
Switching Power Supply
Precision Voltage Reference
Charger
Instrumentation
3
1
2
NCP431
Pin 1. Reference
2. Cathode
3. Anode
SOT−23−3
SN SUFFIX
CASE 318
NCP432
Pin 1. Cathode
2. Reference
3. Anode
Typical Applications
ORDERING AND MARKING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
©
Semiconductor Components Industries, LLC, 2013
February, 2013
−
Rev. 4
1
Publication Order Number:
NCP431/D
NCP431A, SC431A, NCP431B, NCP432B Series
Cathode
(K)
Reference
(R)
Cathode
(K)
Reference
(R)
2.5 V
ref
Anode
(A)
Anode
(A)
Figure 2. Representative Block diagram
Figure 1. Symbol
MAXIMUM RATINGS
(Full operating ambient temperature range applies, unless otherwise noted)
Symbol
V
KA
I
K
I
ref
T
J
T
A
T
stg
P
D
Cathode to Anode Voltage
Cathode Current Range, Continuous
Reference Input Current Range, Continuous
Operating Junction Temperature
Operating Ambient Temperature Range
Storage Temperature Range
Total Power Dissipation @ T
A
= 25°C
Derate above 25°C Ambient Temperature
D, LP Suffix Plastic Package
SN1 Suffix Plastic Package
Total Power Dissipation @ T
C
= 25°C
Derate above 25°C Case Temperature
D, LP Suffix Plastic Package
ESD Rating
Rating
Value
37
−100
to +150
−0.05
to +10
150
−40
to +125
−65
to +150
Unit
V
mA
mA
°C
°C
°C
W
0.70
0.52
1.5
W
P
D
HBM
MM
>2000
>200
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
KA
I
K
Cathode to Anode Voltage
Cathode Current
Condition
Min
V
ref
0.04
Max
36
100
Unit
V
mA
THERMAL CHARACTERISTICS
Symbol
R
QJA
R
QJL
Characteristic
Thermal Resistance,
Junction−to−Ambient
Thermal Resistance,
Junction−to−Lead (Lead 3)
LP Suffix Package
(50 mm
2
x 35
mm
Cu)
176
75
D Suffix Package
(50 mm
2
x 35
mm
Cu)
210
68
SN Suffix Package
(10 mm
2
x 35
mm
Cu)
255
80
Unit
°C/W
°C/W
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2
NCP431A, SC431A, NCP431B, NCP432B Series
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C, unless otherwise noted.)
NCP431AC
Symbol
V
ref
Characteristic
Reference Input Voltage
V
KA
= V
ref
, I
K
= 1 mA
T
A
= 25°C
T
A
= T
low
to T
high
(Note 1)
Reference Input Voltage Deviation Over Temperat-
ure Range (Figure 1, Notes 2, 3)
V
KA
= V
ref
, I
K
= 1 mA
Ratio of Change in Reference Input Voltage to
Change in Cathode to Anode Voltage
I
K
= 1 mA (Figure 2),
DV
KA
= 10 V to V
ref
DV
KA
= 36 V to 10 V
Reference Input Current (Figure 2)
I
K
= 1 mA, R1 = 220 k, R2 =
R
T
A
=
−40°C
to +125°C
Reference Input Current Deviation Over Temperat-
ure Range (Figure 2, Note 2, 3)
I
K
= 1 mA, R1 = 10 k, R2 =
R
Minimum Cathode Current For Regulation
V
KA
= V
ref
(Figure 1)
Off−State Cathode Current (Figure 3)
V
KA
= 36 V, V
ref
= 0 V
Dynamic Impedance (Figure 1, Note 3)
V
KA
= V
ref
,
DI
K
= 1.0 mA to 100 mA
f
v
1.0 kHz
Min
Typ
Max
Min
NCP431AI
Typ
Max
NCP431AV/
SC431AV
Min
Typ
Max
Unit
V
2.475 2.500 2.525
2.475 2.500 2.525
−
−
−
2.475 2.500 2.525 2.475 2.500 2.525
2.465 2.500 2.525 2.460 2.500 2.525
−
5.0
10
−
10
15
mV
DV
refT
DV
ref
DV
AK
mV/
V
−
−
−
−2.00
−1.28
81
−3.1
−1.9
190
−
−
−
−2.00
−1.28
81
−3.1
−1.9
190
−
−
−
−2.00
−1.28
81
−3.1
−1.9
190
nA
I
ref
DI
refT
−
−
−
−
22
40
180
0.22
55
80
1000
0.5
−
−
−
−
22
40
180
0.22
55
80
1000
0.5
−
−
−
−
22
40
180
0.22
55
80
1000
0.5
nA
I
min
I
off
|Z
KA
|
mA
nA
W
1. T
low
=
−40°C
for NCP431AI, NCP431AV, SC431AV
= 0°C for NCP431AC
T
high
= 70°C for NCP431AC
= 85°C for NCP431AI
= 125°C for NCP431AV, SC431AV
2. Guaranteed by design
3. The deviation parameter
DV
refT
is defined as the difference between the maximum and minimum values obtained over the full operating
ambient temperature range that applies.
The average temperature coefficient of the reference input voltage, Vref is defined as:
V
ppm
ref
°
C
V
DV
ref
DT
+
ref
@25° C
106
+
DV
DT
A
ref
10 6
A
V
@25° C
ref
aVref
can be positive or negative depending on whether Vref Min or Vref Max occurs at the lower ambient temperature.
Example:
DV
refT
= 17 mV and slope is positive
V
ref
= 2.5 V,
DT
A
= 165°C
(from
−40°C
to +125°C)
aV
ref
+
0.017
@
10 6
165
@
2.5
+
41.2 ppm
°
C
4. The dynamic impedance Z
KA
is defined as: (|Z
KA
| = (DV
KA
/DI
K
). When the device is programmed with two external resistors, R1 and R2,
the total dynamic impedance of the circuit is defined as: |Z
KA
’|
[
|Z
KA
| (1 + (R1/R2)).
5. SC431AVSNT1G
−
T
low
=
−40°C,
T
high
= 125°C. Guaranteed by design. SC Prefix for Automotive and Other Applications Requiring Unique
Site and Control Change Requirements; AEC−Q100 Qualified and PPAP Capable.
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3
NCP431A, SC431A, NCP431B, NCP432B Series
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C, unless otherwise noted.)
NCP431BC
NCP432BC
Symbol
V
ref
Characteristic
Reference Input Voltage
V
KA
= V
ref
, I
K
= 1 mA
T
A
= 25°C
T
A
= T
low
to T
high
(Note 6)
Reference Input Voltage Deviation Over Tem-
perature Range (Figure 1, Notes 7, 8)
V
KA
= V
ref
, I
K
= 1 mA
Ratio of Change in Reference Input Voltage to
Change in Cathode to Anode Voltage
I
K
= 1 mA (Figure 2),
DV
KA
= 10 V to V
ref
DV
KA
= 36 V to 10 V
Reference Input Current (Figure 2)
I
K
= 1 mA, R1 = 220 k, R2 =
R
T
A
=
−40°C
to +125°C
Reference Input Current Deviation Over Tem-
perature Range (Figure 2, Note 7, 8)
I
K
= 1 mA, R1 = 10 k, R2 =
R
Minimum Cathode Current For Regulation
V
KA
= V
ref
(Figure 1)
Off−State Cathode Current (Figure 3)
V
KA
= 36 V, V
ref
= 0 V
Dynamic Impedance (Figure 1, Note 8)
V
KA
= V
ref
,
DI
K
= 1.0 mA to 100 mA
f
v
1.0 kHz
Min
Typ
Max
Min
NCP431BI
NCP432BI
Typ
Max
NCP431BV
NCP432BV
Min
Typ
Max
Unit
V
2.4875 2.500 2.5125 2.4875 2.500 2.5125 2.4875 2.500 2.5125
2.4875 2.500 2.5125 2.4775 2.500 2.5125 2.4725 2.500 2.5125
−
−
−
−
−
−
−
5.0
10
1−
−
−
10
15
15
mV
DV
refT
DV
ref
DV
AK
mV/
V
−
−
−
−2.00
−1.28
81
−3.1
−1.9
190
−
−
−
−2.00
−1.28
81
−3.1
−1.9
190
−
−
−
−2.00
−1.28
81
−3.1
−1.9
190
nA
I
ref
DI
refT
−
−
−
−
22
40
180
0.22
55
80
1000
0.5
−
−
−
−
22
40
180
0.22
55
80
1000
0.5
−
−
−
−
22
40
180
0.22
55
80
1000
0.5
nA
I
min
I
off
|Z
KA
|
mA
nA
W
6. T
low
=
−40°C
for NCP431BI, NCP431BV, NCP432BI, NCP432BV
= 0°C for NCP431BC, NCP432BC
T
high
= 70°C for NCP431BC, NCP432BC
= 85°C for NCP431BI, NCP432BI
= 125°C for NCP431BV, NCP432BV
7. Guaranteed by design
8. The deviation parameter
DV
refT
is defined as the difference between the maximum and minimum values obtained over the full operating
ambient temperature range that applies.
The average temperature coefficient of the reference input voltage, Vref is defined as:
V
ppm
ref
°
C
V
DV
ref
DT
+
ref
@25° C
106
+
DV
DT
A
ref
10 6
A
V
@25° C
ref
aVref
can be positive or negative depending on whether Vref Min or Vref Max occurs at the lower ambient temperature.
Example:
DV
refT
= 17 mV and slope is positive
V
ref
= 2.5 V,
DT
A
= 165°C
(from
−40°C
to +125°C)
aV
ref
+
0.017
@
10 6
165
@
2.5
+
41.2 ppm
°
C
9. The dynamic impedance Z
KA
is defined as: (|Z
KA
| = (DV
KA
/DI
K
). When the device is programmed with two external resistors, R1 and R2,
the total dynamic impedance of the circuit is defined as: |Z
KA
’|
[
|Z
KA
| (1 + (R1/R2))
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4
NCP431A, SC431A, NCP431B, NCP432B Series
Input
Input
IK
V KA
R1
Iref
IK
Vref
R2
Vref
R1
R2
VKA
Input
Ioff
V KA
V
KA
+
V
ref
1
)
)
I
ref
@
R1
Figure 3. Test Circuit for V
KA
= V
ref
Figure 4. Test Circuit for V
KA
> V
ref
Figure 5. Test Circuit for I
off
150.0
I
K
, CATHODE CURRENT (mA)
I
K
, CATHODE CURRENT (mA)
V
KA
= V
ref
T
A
= 25°C
60.0
Input
I
K
V
KA
V
KA
= V
ref
T
A
= 25°C
Input
I
K
V
KA
100.0
50.0
0.0
−50.0
40.0
20.0
0.0
−20.0
−40.0
−60.0
−1.0
I
Min
−100.0
−1.0
0.0
1.0
2.0
3.0
0.0
1.0
2.0
3.0
V
KA
, CATHODE VOLTAGE (V)
V
KA
, CATHODE VOLTAGE (V)
Figure 6. Cathode Current versus Cathode
Voltage
V
ref
, REFERENCE INPUT VOLTAGE (mV)
2540
Input
Figure 7. Cathode Current versus Cathode
Voltage
120
I
ref
, REFERENCE INPUT CURRENT
(nA)
110
Input
V
KA
I
K
2530
2520
2510
2500
2490
2480
2470
2460
−50
−25
V
ref
V
KA
= V
ref
I
K
= 1 mA
I
K
= 1 mA
V
KA
100
90
80
70
60
50
40
−50
−25
0
25
50
220k
I
K
I
ref
0
25
50
75
100
125
75
100
125
T
A
, AMBIENT TEMPERATURE (°C)
T
A
, AMBIENT TEMPERATURE (°C)
Figure 8. Reference Input Voltage versus
Ambient temperature
Figure 9. Reference Input Current versus
Ambient temperature
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