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AP431/AP431A
Adjustable Precision Shunt Regulator Features
*
Description
The AP431/AP431A are 3-terminal adjustable precision shunt regulators with guaranteed temperature stability over the applicable extended commercial temperature range. The output voltage may be set at any level greater than 2.495V(VREF) up to 36V merely by selecting two external resistors that act as a voltage divider network. These devices have a typical output impedance of 0.2. Active output circuitry provides very sharp turn-on characteristics, making these devices excellent improved replacements for Zener diodes in many applications. The precise (+/-) 1% Reference voltage tolerance of the AP431/431A make it possible in many applications to avoid the use of a variable resistor, consequently saving cost and eliminating drift and reliability problems associated with it.
* * * * * * * *
Precision reference voltage AP431 : 2.495V 1% AP431A : 2.495V 0.5% Sink current capability: 200mA Minimum cathode current for regulation: 300A Equivalent full-range temp coefficient: 30 ppm/oC Fast turn-on response Low dynamic output impedance: 0.2 Programmable output voltage to 36v Low output noise. Packages: TO92, SOT89, SOT23, SOT25 and SOP
Ordering Information
AP431XXXXX
Operating Temp. Range Blank : I: -20 oC~85oC -40 oC~85oC
Reference Voltage Tolerance: Blank : +/- 1% A : +/- 0.5%
Package
Lead Free
Packing
Blank : Normal Blank : SOP-8L Blank : Tube or bulk Y : SOT89-3L L : Lead Free Package A : Taping V : TO92-3L W : SOT23-3L R : SOT23-3L Q : SOT25
Typical Application Circuit
VIN VOUT
+
Cin AP431
R1
+
Cout
R2
VOUT = (1+R1/R2)VREF Precision Regulator
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
Rev.1.0 May.7, 2004 1/17
AP431/AP431A
Adjustable Precision Shunt Regulator Block Diagram Symbol
Cathode (C)
REF (R) + Cathode (C) VREF
REF (R)
Anode (A)
Anode (A)
Pin Configuration
Order Number AP431Y AP431 AY AP431IY AP431IAY (SOT89) Pin Configuration (Top View) 3 Cathode 2 Anode 1 REF Order Number AP431R AP431AR AP431IR AP431IAR (SOT23) Pin Configuration (Top View)
3 Cathode Anode 1 2 REF
AP431 AP431A AP431I AP431IA (SOP)
Cathode Anode Anode NC
1 2 3 4
Anachip Corp. www.anachip.com.tw 2/17
+ + +
AP431V AP431 AV AP431IV AP431IAV (TO92)
3 Cathode 2 Anode 1 REF
AP431W AP431AW AP431IW AP431IAW (SOT23)
3 REF Anode 1 2 Cathode
8 7 6 5
REF Anode Anode NC
AP431 Q AP431 AQ AP431IQ AP431IAQ (SOT25)
NC NC Cathode
1 2 3
5 4
Anode REF
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator Marking Information
(1) SOT23 / SOT25 / SOT89 P/N Type AP431Y AP431AY AP431IY AP431IAY AP431W AP431AW AP431IW AP431IAW AP431R AP431AR AP431IR AP431IAR AP431Q AP431AQ AP431IQ AP431IAQ (2) SOP XX A4 A5 AA AB A6 A7 AC AD A8 A9 AE AF A2 A3 AG AH
(Top View) SOT23/SOT25 XX YM X XX: P/N Type Date code Y : Year M : Month(A~L) X: Blank : normal L : Lead Free Package SOT89 XX YMX
( Top view ) Logo
Date code
YY : Year WW: Nth week
AC AP431X X YYWW X
Lead Free
Blank: normal L: Lead Free Package
Temp. grade
Blank: -20oC ~ +85oC I : -40oC ~ +85oC
Accuracy
Blank: 2 . 495 1 % A : 2 . 495 0 . 5 %
(3)TO92
( Top view )
Temp. grade Accuracy
Blank: 2.495 1% A : 2.495 0.5% Blank: -20oC ~ +85oC I : -40oC ~ +85oC
AP431X X YWW X X
Date code
Y : Year WW: Nth week
Internal code
Lead Free
Blank: normal L: Lead Free Package
Anachip Corp. www.anachip.com.tw 3/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator Absolute Maximum Ratings
Cathode Voltage .........................................................................................................................36V Continuous Cathode Current ....................................................................................... -10mA ~ 250mA Reference Input Current Range ................................................................................................... 10mA Operating Temperature Range (AP431)............................................................................-20oC ~ 85oC (AP431I).......................................................................... -40oC ~ 85oC Lead Temperature................................................................................................................... 260oC Storage Temperature .................................................................................................... -65oC ~ 150oC Power Dissipation (Notes 1. 2) SOT89 Package .................................................................. 0. 80W TO92 Package .................................................................. 0.78W SOT23 package .................................................................. 0.25W SOT25 Package...................................................................0.25W SOP Package................................................................... 0.6W Note 1: TJ, max =150oC Note 2: Ratings apply to ambient temperature at 25oC
Electrical Characteristics (Ta=25oC , unless otherwise specified.)
PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
VKA = VREF, AP431 Reference voltage I KA = 10mA (Fig.1) AP431A Deviation of Reference input voltage VKA = VREF, IKA = 10mA, over temperature (Note 3) Ta = Full range (Fig.1) Ratio of the change in Reference VKA = 10V voltage to the change in Cathode IKA = 10mA (Fig.2) ~VREF voltage VKA= 36V ~10V R1 = 10K,R2 = IKA= 10mA Reference input current (Fig.2) Deviation of Reference input current R1 = 10K,R2 = IKA = 10mA over temperature Ta = Full range (Fig.2) Minimum Cathode current for VKA = VREF (Fig.1) regulation Off-state current VKA = 36V, VREF = 0V (Fig.3) V KA = VREF V KA = VREF Dynamic output impedance (Note 4) IKA = 0.1mA ~ 15mA Frequency 1KHz (Fig.1)
VREF VREF VREF VKA IREF IREF IKA(MIN) IKA(OFF)
2.470 2.495 2.520 2.482 2.507 8.0 -1.4 -1 1.4 0.4 0.19 0.1 0.2 20
V mV
-2.0 mV/V -2 3.5 1.2 0.5 1.0 0.5 mV/V A A mA A
Z KA
VMAX VDEV = VMAX - VMIN VMIN
TI
TEMPERATURE
T2
Anachip Corp. www.anachip.com.tw 4/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator
Note 3. Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference over the full temperature range. The average temperature coefficient of the reference input voltage VREF is defined as:
VREF
VDEV ) 10 6 VREF (25C) .............................................. ( ppm ) = C T2 - T1 (
Where: T2 - T1 = full temperature change. VREF can be positive or negative depending on whether the slope is positive or negative. Note 4. The dynamic output impedance, RZ, is defined as:
Z KA =
V KA IKA
When the device is programmed with two external resistors R1 and R2 (see Figure 2.), the dynamic output impedance of the overall circuit, is defined as:
Z KA =
'
v Z KA i
(1 +
R1 ) R2
Test Circuits
Input IN IN
VKA IKA R1 VREF IREF VREF
IKA VKA
VKA
R2
IZ(OFF)
Note:VKA=VREF(1+R1/R2)+IREFx R1
Fig1. Test Circuit for V KA= VREF
Fig2. Test circuit for V KAVREF
Fig3. Test Circuit for off-state Current
Anachip Corp. www.anachip.com.tw 5/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator Typical Performance Characteristics
Cathode current Vs Cathode Voltage
100 VKA=Vref Ta=25oC Cathode current(uA) 600 VKA=Vref Ta=25oC
Cathode current (uA) Vs Cathode Voltage
Cathode current(mA)
400
0
200
0
-100
-1.5
0.5 -0.5 Cathode Voltage(v)
1.5
2.5
-200 -1
-0.5
0
0.5 1.5 1 Cathode Voltage(v)
2
2.5
Reference Voltage Vs Free-Air Temperature
2500 Reference Voltage(mV) 2495 2490 2485 2480 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 Free-Air Tempeture (oC)
Reference input current Vs free Temperature
Reference input current (uA) 2 1.8 1.6 1.4 1.2 1 -50 R1=10K IKA=10mA
-25
0 25 50 75 Free-Air Temperature(oC)
100
125
Change in Reference Voltage vs Cathode Voltage
Change in Reference Voltage (mv) 0 -2 -4 -6 -8 -10 -12 0 5 10 15 20 Cathode Voltage (V) 25 30 IKA=10mA Ta=25oC
Anachip Corp. www.anachip.com.tw 6/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator Typical Performance Characteristics(Continued)
SMALL-SIGNAL VOLTAGE AMPLIFICATION vs. FREQUENCY
60
AV-Small Signal Voltage Amplification (dB)
50 40 30 20 10 0 1K 10K
IKA=10mA TA=25oC 15K 9F
Output IKA 232
+ 8.25K -
TEST CIRCUIT FOR VOLTAGE AMPLIFICATION
f-Frequency-Hz
100K
1M
10M
REFERENCE IMPEDANCE vs. FREQUENCY
100
ZKA--Reference Impedance --
IKA=10mA TA=25oC
10
50 +
1
TEST CIRCUIT FOR REFERENCE IMPEDANCE
0.1 1K 10K 100K 1M 10M
f-Frequency-Hz
Anachip Corp. www.anachip.com.tw 7/17
1K
+
GND
Output I KA
GND
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator
PULSE RESPONSE
6
TA=25oC
5 Input and Output Voltage-V
Input
220 Output
4
Pulse Generator f=100kHz
50
3
Output
GND
2
TEST CIRCUIT FOR PULSE RESPONSE
1
0 -1 0 1 2 3 t-Time- S 4 5 6 7
STABILITY BOUNDARY CONDITIONS
100 A VKA=Vref 90 80 IKA-Cathode Current-mA 70 60 50 40 30 20 10 0 0.001 0.01 0.1 1 C L-Load Capacitance-F 10
CL R2
150
o
TA=25 C
B VKA=5V C VKA=10V D VKA=15V B Stable
CL
I KA
+ -
VBATT
Stable A
C
TEST CIRCUIT FOR CURVE A
D
R1=10K
I KA 150
+ -
VBATT
The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V+ were adjusted to establish the initial V KA and I KA conditions with C L =0.V BATT and CL were then adjusted to determine the ranges of stability.
TEST CIRCUIT FOR CURVE B, C, AND D
Anachip Corp. www.anachip.com.tw 8/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator Application Examples
V IN VIN RCL R R1A R1B VIN IOUT
ON R2A R2B OFF
+
LED on when Low LimitVINHigh Limit Low Limit VREF (1+R1B/R2B) High Limit VREF (1+R1A/R2A)
V IN Delay = RC x ln( ) VIN -VREF
IOUT = VREF / RCL
Fig.4 Voltage Monitor
Fig.5 Delay Timer
Fig.6 Current Limiter or Current Source
VIN
IOUT
VIN
VOUT
VIN
PUSE R1
VOUT
R1
RS
R2
R2
IOUT = VREF / RS
VOUT = (1 + R1/R2) x VREF
LIMIT
(1 + R1/R2) x VREF
Fig.7 Constant-Current Sink
Fig.8 Higher-Current Shunt Regulator
Fig.9 Crow Bar
VIN R1A R1B Output ON when Low Limint < VIN< High Limit
+
R2A
R2B
VBE
Low Limit High Limit
VREF(1 + R1B/R2B) +VBE VREF(1 + R1A/R2A)
Fig.10 Over-Voltage / Under-Voltage Protection Circuit
Anachip Corp. www.anachip.com.tw 9/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator Package Diagrams
(1) SOT89-3L Package Outline Dimension
D1
E e1 e 50(2x) 80(2x) D c A b b1 b
Symbol A b b1 C D D1 e e1 E HE L
Dimensions In Millimeters Min. 1.40 0.36 0.41 0.35 4.40 1.40 2.90 1.45 2.40 3.94 0.80 Nom. 1.50 0.42 0.47 0.39 4.50 1.60 3.00 1.50 2.50 Max. 1.60 0.48 0.53 0.43 4.60 1.75 3.10 1.55 2.60 4.25 1.20
L
HE
Dimensions In Inches Min. 0.055 0.014 0.016 0.014 0.173 0.055 0.114 0.057 0.094 0.155 0.031 Nom. 0.059 0.016 0.043 0.015 0.177 0.062 0.118 0.059 0.098 Max. 0.063 0.018 0.051 0.017 0.181 0.069 0.122 0.061 0.102 0.167 0.047
Anachip Corp. www.anachip.com.tw 10/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator
(2) TO92-3L Package Outline Dimension
A1 A b1 D b e b
E
L
Symbol A A1 b b1 D E L e
Dimensions In Millimeters Min. Nom. Max. 3.302 3.556 3.810 1.016 0.330 0.381 0.432 0.406 0.457 0.506 4.445 4.572 4.699 4.445 4.572 4.699 13.00 15.500 1.150 1.270 1.390
Dimensions In Inches Min. Nom. Max. 0.130 0.140 0.150 0.040 0.013 0.015 0.017 0.016 0.018 0.020 0.175 0.180 0.185 0.175 0.180 0.185 0.512 0.610 0.045 0.050 0.055
Anachip Corp. www.anachip.com.tw 11/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator
(3) SOT23-5L Package Outline Dimension
D e1
1(4x)
5
4 0.10 C 5x Seating Plane A1
2(4x)
E1
E
A
A2
1 e
2
3 b
With Plating
b1
C
C1
Gauge Plane 0.25 mm
Base Metal
b
L L1
Symbol A A1 A2 b b1 c c1 D E E1 L L1 e e1 1 2
Dimensions In Millimeters Min. 1.05 0.05 1.00 0.25 0.25 0.08 0.08 2.70 2.60 1.50 0.35 Nom. 1.20 0.10 1.10 0.40 0.11 2.85 2.80 1.60 0.45 0.60 Ref. 0.95 Bsc. 1.90 Bsc. 0o 3o 6o 5o 5o 8o 10o 7o 10o Max. 1.35 0.15 1.20 0.55 0.45 0.20 0.15 3.00 3.00 1.70 0.55
Dimensions In Inches Min. 0.041 0.002 0.039 0.010 0.010 0.003 0.003 0.106 0.102 0.059 0.014 Nom. 0.047 0.004 0.043 0.016 0.004 0.112 0.110 0.063 0.018 0.024 Ref. 0.037 Bsc. 0.075 Bsc. 0o 3o 6o 5o 5o 8o 10o 7o 10o Max. 0.053 0.006 0.047 0.022 0.018 0.008 0.006 0.118 0.118 0.067 0.022
Anachip Corp. www.anachip.com.tw 12/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator
(4) SOT23-3L Package Outline Dimension
2
1
3 e
D
A2
A
b
Symbol A A1 A2 b C D E e HE L
Dimensions In Millimeters Min. 1.00 0.00 1.00 0.35 0.10 2.70 1.40 1.70 2.40 0.30 Nom. 1.20 1.15 0.175 2.90 1.60 2.00 2.70 Max. 1.40 0.10 1.30 0.50 0.25 3.10 1.80 2.30 3.00 0.55
A1
C
L
Dimensions In Inches Min. 0.039 0.000 0.039 0.014 0.004 0.106 0.055 0.067 0.094 0.012 Nom. 0.047 0.045 0.007 0.114 0.063 0.079 0.106 Max. 0.055 0.004 0.051 0.020 0.010 0.122 0.071 0.091 0.118 0.022
Anachip Corp. www.anachip.com.tw 13/17
Rev.1.0 May.7, 2004
HE
E
AP431/AP431A
Adjustable Precision Shunt Regulator
(5) SOP-8L Package Outline Dimension
E
H
L VIEW "A"
D 7 (4X) A2 A
0.015x45
7 (4X)
A1
e
B y
C
VIEW "A"
Symbol A A1 A2 B C D E e H L y
Dimensions In Millimeters Min. Nom. Max. 1.40 1.60 1.75 0.10 0.25 1.30 1.45 1.50 0.33 0.41 0.51 0.19 0.20 0.25 4.80 5.05 5.30 3.70 3.90 4.10 1.27 5.79 5.99 6.20 0.38 0.71 1.27 0.10 0O 8O
Dimensions In Inches Min. Nom. Max. 0.055 0.063 0.069 0.040 0.100 0.051 0.057 0.059 0.013 0.016 0.020 0.0075 0.008 0.010 0.189 0.199 0.209 0.146 0.154 0.161 0.050 0.228 0.236 0.244 0.015 0.028 0.050 0.004 0O 8O
Anachip Corp. www.anachip.com.tw 14/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator Taping Information
(1)TO92 TAPING
M
h A
Ho
T
Do
Po
F2 F1
Symbol Po M Ho Do A h T F1 F2
Min. 12.4 2.0 15.5 0.0 2.4 2.4
Millimeters Typ. 12.7 2.5 16.0 4.0 6.0 18.0 2.5 2.5
Max. 13.0 3.0 16.5 1.0 2.9 2.9
Min. 0.488 0.079 0.610 0.000 0.094 0.094
40mm
Inches Typ. 0.500 0.098 0.630 0.157 0.236 0.709 0.098 0.098
Max. 0.512 0.118 0.650 0.039 0.114 0.114
205mm
E
330mm 90 1mm
30 1mm
53 2mm
45mm
76 1mm 360 2mm
Anachip Corp. www.anachip.com.tw 15/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator
(2)TO92 TAPING
H2 H2 H2A H2A A H3 H4 L1 H1 D2
L
H W1 W
D T2 T T1 F1 F2 P1 P P2 D1
Millimeters Min. Typ. A 3.18 7.59 D 3.8 4 D1 0.36 0.445 D2 F1,F2 2.4 2.5 F1-F2 0.30 H 15.5 16 H1 8.5 9 H2 H2A H3 H4 L L1 2.5 P 12.5 12.7 P1 5.95 6.35 P2 50.3 50.8 T T1 T2 0.36 0.52 W 17.5 18.25 W1 5 6 ----* 253 254 ----* = every 20 pcs distance. Symbol
Max. 12 4.2 0.53 9.0 2.7 16.5 9.5 0.5 0.5 27 20 11 12.9 6.75 51.3 0.55 1.42 0.68 19 7 255
Min. 0.125 0.150 0.014 0.094 0.610 0.335 0.098 0.492 0.234 1.980 0.014 0.689 0.197 9.961
Inches Typ. 0.299 0.157 0.018 0.098 0.012 0.630 0.354 0.500 0.250 2.000 0.020 0.719 0.236 10.000
Max. 0.472 0.165 0.021 0.354 0.106 0.650 0.374 0.020 0.020 1.063 0.787 0.433 0.508 0.266 2.020 0.022 0.056 0.027 0.748 0.276 10.039
Anachip Corp. www.anachip.com.tw 16/17
Rev.1.0 May.7, 2004
AP431/AP431A
Adjustable Precision Shunt Regulator BOX Dimension
39.5 330
811.5 40.5 40.5 197 38.5 41 40 330
40
195
53
37.5 6 195 70 43
556 24 18.68 16.67 unit:mm.
4.68
18.18
Anachip Corp. www.anachip.com.tw 17/17
40
Rev.1.0 May.7, 2004

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