AP431/AP431A ADJUSTABLE PRECISION SHUNT REGULATOR. Pin Assignments. Description. Features. AP431/AP431A Document number: DS31002 Rev.

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1 Description The AP431 and 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 (V REF ) up to 36V merely by selecting two external resistors that act as a voltage divider network. These devices have a typical output impedance of 0.2Ω. 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 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. Features Precision reference voltage AP431: 2.495V ± 1% AP431A: 2.495V ± 0.5% Sink current capability: 200mA Minimum cathode current for regulation: 300μA Equivalent full-range temp coefficient: 30 ppm/ Fast turn-on response Low dynamic output impedance: 0.2Ω Programmable output voltage to 36V Low output noise Lead Free packages: SOT25, S59, S59R, SOT89-3L and TO92-3L SOT23, SOT23R, SOT25, S59, S59R, SO-8, SOT89-3L, TO92-3L: Available in Green Molding ompound (No Br, Sb) Lead Free Finish/ RoHS ompliant (Note 1) Pin Assignments N 1 N 2 ATHODE 3 ANODE 1 ANODE 1 (1) SOT25 (2) SO-8 (Top View) (Top View) 5 ANODE 4 REF ATHODE ANODE ANODE N 4 5 (3) S59 (4) S59R (Top View) (Top View) 3 REF 2 ATHODE ANODE 1 (5) SOT23 (6) SOT23R (Top View) (Top View) 3 REF 2 ATHODE ANODE REF (7) SOT89-3L (8) TO92-3L (Top View) (Top View) REF Anode athode 3 2 REF ANODE ANODE N 3 ATHODE 1 REF ATHODE REF 3 athode 2 Anode Notes: 1. EU Directive 2002/95/E (RoHS). All applicable RoHS exemptions applied. Please visit our website at 1 of 18

2 Typical Application ircuit V IN V OUT IN R1 OUT AP431 R2 V = (1 R1/ R2) V OUT Precision Regulator REF Functional Block Diagram REF (R) V REF - athode () Anode (A) Symbol athode () REF (R) Anode (A) 2 of 18

3 Absolute Maximum Ratings Symbol Parameter Rating Unit Vcv athode Voltage 36 V I ontinuous athode urrent -10 to 250 ma I REF Reference Input urrent 10 ma T OP Operating Temperature -20 to 85 T ST Storage Temperature -65 to 150 SOT23(R) 400 mw SOT mw P D Power Dissipation (Notes 2, 3) S59(R) 400 mw SO mw SOT89-3L 800 mw TO92-3L 780 mw o o Notes: 2. T J, max = Ratings apply to ambient temperature at 25. Electrical haracteristics (T A = 25, Vdd = 3V; unless otherwise specified) Symbol Parameter Test onditions Min Typ. Max Unit V REF Reference voltage V KA = V REF, AP I KA = 10mA (Fig.1) AP431A V V REF Deviation of Reference input V KA = V REF, I KA = 10mA, voltage over temperature Ta = Full range (Fig.1) (Note 4) mv ΔV REF Ratio of the change in V KA = V REF to10v mv/v ΔV KA Reference voltage to the I KA = 10mA (Fig. 2) change in athode voltage V KA = 10V to 36V -1-2 mv/v I REF Reference input current R1 = 10KΩ,R2 = I KA = 10mA (Fig. 2) µa αi REF Deviation of Reference input R1 = 10KΩ,R2 = I KA = 10mA current over temperature Ta = Full range (Fig. 2) µa I KA(MIN) Minimum athode current for regulation V KA = V REF (Fig.1) ma I KA(OFF) Off-state current V KA = 36V, V REF = 0V (Fig. 3) µa Z KA Dynamic output impedance (Note 5) V KA = V REF V KA = V REF ΔI KA = 0.1mA ~ 15mA Frequency 1KHz (Fig.1) Ω 3 of 18

4 Electrical haracteristics (T A = 25, V dd = 3V; unless otherwise specified) V MAX V = V - V DEV MAX MIN V MIN T1 Temperature T2 Notes: 4. Deviation of reference input voltage, V DEV, is defined as the maximum variation of the reference over the full temperature range. The average temperature coefficient of the reference input voltage αv REF is defined as: αvref VDEV 6 ( ) 10 VREF(25 ) T2 T1 = ( ppm ) Where: T2 T1 = full temperature change. αv REF can be positive or negative depending on whether the slope is positive or negative. Notes: 5. The dynamic output impedance, R Z, is defined as: Z KA = ΔV ΔI KA KA 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 Δv = Z Δi ' KA KA (1 R1 ) R2 Test onditions Input IN IN V KA I KA I KA R1 I REF V KA V KA V REF R2 V REF I Z(OFF) Fig 1. Test ircuit for V KA = VREF Note: V KA = V REF (1 R1/R2) I REF xr1 Fig 2. Test ircuit for V KA > VREF 4 of 18 Fig 3. Test ircuit for Off-State urrent

5 Typical Performance haracteristics 100 V KA = VREF T A = V KA = VREF T A = 25 ATHODE URRENT(mA) 0 ATHODE URRENT( μ A) I KA(MIN) ATHODE VOLTAGE (V) athode urrent vs. athode Voltage ATHODE VOLTAGE (V) athode urrent ( μa) vs. athode Voltage ATHODE URRENT(mA) REFERENE INPUT URRENT( μ A) R1 = 10k I = 10mA KA FREE-AIR TEMPERATURE () Reference Voltage vs. Free-Air Temperature FREE-AIR TEMPERATURE (V) Reverence Input urrent vs. Free Temperature HANGE in REFERENE VOLTAGE (mv) I KA = 10mA T A = ATHODE VOLTAGE (V) hange in Reference Voltage vs. athode Voltage 5 of 18

6 Typical Performance haracteristics (cont.) A V - SMALL SIGNAL VOLTAGE AMPLIFIATION (db) I KA = 10mA T A = K 10K 100K 1M 10M f-frequeny -Hz Small-Signal Voltage Amplification vs. Frequency I KA 15KΩ 9μF KΩ Test ircuit for Voltage Amplification Output 232Ω GND ZKA REFERENE IMPEDANE I KA = 10mA T A = 25 1KΩ 50Ω I KA Output GND Test ircuit for Reference Impedance 0 1K 10K 100K 1M 10M f-frequeny -Hz Reference Impedance vs. Frequency 6 of 18

7 Typical Performance haracteristics (cont.) INPUT and OUTPUT VOLTAGE (V) T = 25 A Input Output t- TIME ( μs) Pulse Response Pulse Generator f = 100kHz 220Ω 50Ω Test ircuit for Pulse Response Output GND IKA - ATHODE URRENT (ma) A V KA = VREF B V KA = 5V V KA = 10V D V KA = 15V Stable A B D T A = 25 Stable 150Ω I KA L - Test ircuit for urve A V BATT L - LOAD APAITANE ( μf) Stability Boundary onditions The areas under the curves represent conditions that may cause the device to oscilate. For curves B,, and D, R2 and V were adjusted to establish the initial V KA and I KA conditions with L = 0. V BATT and L were then adjusted to determine the ranges of stability. L I KA R1 = 10KΩ 150Ω R2 V BATT - Test ircuit for urve B,, and D 7 of 18

8 Application Examples V IN V IN R L I OUT V IN R1A R1B R R2A R2B OFF N LED on when Low Limit < V IN < High Limit V IN Low Limit V REF (1 R1B/R2B) Delay = R x ln ( V IN - V REF High Limit V REF (1 R1A/R2A) Fig 5. Delay Timer Fig. 4 Voltage Monitor ) I = V /R OUT REF L Fig 6. urrent Limiter or urrent Source V IN I OUT V IN R 1 V OUT V IN PULSE R 1 V OUT R S R 2 R 2 I = V / R OUT REF S Fig. 7 onstant-urrent Sink V OUT = (1 R1/R2) x VREF Fig. 8 Higher-urrent Shunt Regulator Limit (1 R1/R2) x V Fig. 9 row Bar REF V IN R1A R1B Output ON when Low Limit < V < High Limit IN R2A R2B V BE Low Limit V (1 R1B/R2B) V REF BE High Limit V (1 R1A/R2A) REF Fig. 10 Over-Voltage/ Under-Voltage Protection ircuit 8 of 18

9 Ordering Information Lead-free Lead-free Lead-free Lead-free Lead-free Device (Note 8) Package ode Packaging (Note 9) 7 /13 Tape and Reel Ammo Box Quantity Part Number Suffix (Note10) Quantity Part Number Suffix AP431(A)SAG-7 SA SOT /Tape & Reel -7 NA NA AP431(A)SRG-7 SR SOT23R 3000/Tape & Reel -7 NA NA AP431(A)QL-7 Q SOT /Tape & Reel -7 NA NA AP431(A)QG-7 Q SOT /Tape & Reel -7 NA NA AP431(A)WL-7 W S /Tape & Reel -7 NA NA AP431(A)WG-7 W S /Tape & Reel -7 NA NA AP431(A)RL-7 R S59R 3000/Tape & Reel -7 NA NA AP431(A)RG-7 R S59R 3000/Tape & Reel -7 NA NA AP431(A)G-13 SO /Tape & Reel -13 NA NA AP431(A)YL-13 Y SOT89-3L 2500/Tape & Reel -13 NA NA AP431(A)YG-13 Y SOT89-3L 2500/Tape & Reel -13 NA NA AP431(A)YG-13R Y SOT89-3L 2500/Tape & Reel -13R NA NA AP431(A)VL-A V TO92-3L NA NA 2000/Box NA AP431(A)VG-A V TO92-3L NA NA 2000/Box NA Notes: 6. SO-8, SOT23 and SOT23R are available in Green products only. 7. Ammo Box is for TO92-3L Spread Lead. 8. Suffix A denotes AP431A device. 9. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at Details of tape and reel options can be seen in document AP2007, which can be found on our website at 9 of 18

10 Marking Information (1) S59 and S59R ( Top View ) 3 XX Y W X 1 2 XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green a~z : Lead Free (2) SOT23 and SOT23R ( Top View ) 3 XX Y W X 1 2 XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green (3) SOT25 5 ( Top View ) 47 XX Y W X XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green a~z : Lead Free (4) SO-8 ( Top View ) Logo Part Number Accuracy Blank : % A : % 8 5 AP431X YY WW X X 1 4 G : Green YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week X : Internal ode 10 of 18

11 Marking Information (cont.) (5) SOT89-3L ( Top View ) X X Y W X XX : Identification code Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : Internal code A~Z: Green a~z : Lead Free (6) TO92-3L Accuracy Blank: % A: % ( Top View ) AP431 X Y WW X X G : Green L : Lead Free Y : Year : 0~9 WW : Week : 01~52; 52 represents 52 and 53 week X : Internal ode Identification ode Table Device Package (Note 11) Identification ode Date ode AP431SA SOT23 D1 YM AP431ASA SOT23 D2 YM AP431SR SOT23R D5 YM AP431ASR SOT23R D6 YM AP431Q SOT25 A2 YM AP431AQ SOT25 A3 YM AP431W S59 A6 YM AP431AW S59 A7 YM AP431R S59 A8 YM AP431AR S59 A9 YM AP431Y SOT89-3L A4 YM AP431AY SOT89-3L A5 YM Notes: 11. For Packaging Details, go to our website at 11 of 18

12 Package Outline Dimensions (All Dimensions in mm) (1) Package type: SOT25 A K J H D B N L M SOT25 Dim Min Max Typ A B D 0.95 H J K L M N α 0 8 All Dimensions in mm (2) Package Type: S59 and S59R A K J G H D B N L M S59 Dim Min Max Typ A B D G H J K L M N α All Dimensions in mm 12 of 18

13 Package Outline Dimensions (cont.) (3) Package Types: SOT23 and SOT23R K J F A H D G B K1 L M SOT23 Dim Min Max Typ A B D F G H J K K L M α All Dimensions in mm (4) Package Type: SO-8 e D b E1 A2 E A A3 A1 h Detail A 45 L ~9 Gauge Plane Seating Plane Detail A SO-8 Dim Min Max A A A A b D E E e 1.27 Typ h L θ 0 8 All Dimensions in mm 13 of 18

14 Package Outline Dimensions (cont.) (5) Package Type: SOT89-3L E B1 8 (4X) B D1 e1 e R0.200 L A H SOT89 Dim Min Max A B B D D E e 1.50 Typ e Typ H L All Dimensions in mm D (6) Package Type: TO92-3L TO92-3L Dim Min Max Typ A B b 0.38 c 0.38 D 3.87 E e 1.27 e L L L L N All Dimensions in mm 14 of 18

15 Package Outline Dimensions (cont.) TO92-3L for Ammo pack 15 of 18

16 Suggested Pad Layout (1) SOT Z G Y 1 Dimensions Value (in mm) Z 3.20 G 1.60 X 0.55 Y X (2) S59 and S59R Z Y Dimensions Value (in mm) Z 3.4 X 0.8 Y E 1.35 X E (3) SOT23 and SOT23R Z Y Dimensions Value (in mm) Z 2.9 X 0.8 Y E 1.35 X E 16 of 18

17 Suggested Pad Layout (cont.) (4) SO-8 X 2 1 Dimensions Value (in mm) X 0.60 Y Y (5) SOT89-3L Y3 Y X1 X2 (2x) Y2 Y4 Y1 Dimensions Value (in mm) X X X Y Y Y Y Y X (3x) 17 of 18

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