SN431AN

SN431/SNF431 Programmable Voltage Reference ◈ Description The SN431 series are 3-terminal precision shunt regulators that are programmable over a wide voltage range of 2.495V to 36V with ±0.5%, ±1.0% tolerance. The SN431 series have a low dynamic impedance of 0.15Ω. These features make the SN431 series an excellent replacement for zener diodes in numerous applications circuits that require a precision reference voltage. ◈ Features • Programmable output voltage from 2.495V to 36V • Voltage reference tolerance : ±0.5%, ±1.0% • Cathode current capability of 1mA to 100mA ◈ Pin Assignment (Top View) A A R RAK PKG : SOT-89 Apply Device : SN431xF PKG : SOT-23 Apply Device : SN431xS PKG : SOT-23 Apply Device : SNF431xS (Top View) (Top View) K R K A (Top View) (Marking Side View) (Marking Side View) A R NC NC K RA K PKG : SOT-25 Apply Device : SN431xN PKG : TO-92 Apply Device : SN431x RAK PKG : TO-92M Apply Device : SN431xM [ K : Cathode, A: Anode, R : Reference ] KSD-I0A013-006 1 SN431/SNF431 ◈ Symbol Cathode(K) ◈ Functional block diagram Cathode(K) Reference(R) + – VREF=2.495V Reference(R) Anode(A) Anode(A) ◈ Ordering Information Vref Tolerance PKG Type TO-92 TO-92M ±1% SOT-23 SOT-23 SOT-25 SOT-89 TO-92 TO-92M ±0.5% SOT-23 SOT-23 SOT-25 SOT-89 1) SN431x Pin Connection : 3) □ : Year & Week Code 1. Cathode, Device Name SN431A SN431AM SN431AS1) SNF431AS2) SN431AN SN431AF SN431B SN431BM SN431BS1) SNF431BS2) SN431BN SN431BF 2. Reference, 3. Anode Marking SN431A SN431A 4GA□3) 4KA□3) N4A□3) SN431A SN431B SN431B 4GB□3) 4KB□3) N4B□3) SN431B 2) SNF431x Pin Connection : 1. Reference, 2. Cathode, 3. Anode KSD-I0A013-006 2 SN431/SNF431 ◈ Absolute maximum ratings Characteristic Cathode to Anode voltage Cathode current Reference input current SOT-23 SOT-25 Power Dissipation SOT-89 TO-92 TO-92M Junction Temperature Operating temperature range Storage temperature range [Ta=25℃] Symbol VKA IK Iref PD(Note1) PD(Note1) PD(Note1) PD(Note2) PD(Note2) TJ Topr Tstg Rating 37 150 10 350 400 500 625 400 150 -40 ~ +85 -55 ~ +150 Unit V mA mA mW ℃ ℃ ℃ Note 1 : Mounted on a glass epoxy PCB board (25.4 × 25.4mm).TA=25℃ Note 2 : TA=25℃ ◈ Recommended operating conditions Characteristic Cathode to Anode voltage Cathode current Symbol VKA IK Rating Min. Vref 1 Max. 36 100 Unit V mA ◈ Electrical Characteristics (Ta=25℃, unless otherwise noted.) Characteristic Reference voltage (Fig.1) Reference input voltage deviation over temperature (Fig.1, Note1,2) Ratio of delta reference input voltage to delta cathode voltage (Fig.2) Reference current (Fig.2) Reference input current deviation over temperature (Fig.2, Note 1,2) Minimum cathode current for regulation Off-state cathode current (Fig.3) Dynamic impedance (Fig.1, Note3) Symbol Vref ΔVref ΔVref ΔVKA Iref ΔIref IK(MIN) IK(off) ZKA Condition VKA=Vref, IK=10mA VKA=Vref , IK=10mA @ -40˚C ≤ Ta ≤ 85˚C IK=10mA Vref≤VKA≤36V Min. Typ. Max. SN431B SN431A 2.482 2.470 2.495 2.508 2.520 30 Unit V 7 mV - -1.0 1.8 0.4 0.35 2.7 0.15 -2.7 4.0 2.5 1.0 1000 0.5 mV/V μΑ μΑ mΑ nA Ω IK=10mA, R1=10KΩ, R2=∞ IK=10mA, R1=10KΩ, R2=∞ @ -40˚C ≤ Ta ≤ 85˚C VKA=Vref VKA=36V, Vref=0V VKA=Vref, f ≤ 1.0KHz 1.0mA ≤ IK ≤ 100mA KSD-I0A013-006 3 SN431/SNF431 Fig. 1 Test circuit for VKA=Vref Fig. 2 Test circuit for VKA>Vref Fig. 3 Test circuit for IK(off) Input IK VKA Input R1 R2 Vref IK Iref VKA Input VKA IK(off) V KA = V ref × (1 + Note. 1. Ambient temperature range: TLOW = -40℃, THigh = 85℃ R1 ) + I ref × R1 R2 2. The deviation parameters △Vref and △Iref are defined as the difference between the maximum value and minimum value obtained over the full operating ambient temperature range that applied. ∆Vref = Vref Max – Vref Min ∆Ta = T2 – T1 A mbient Temperature The average temperature coefficient of the reference input voltage, αVref is defined as: ΔV ref × 10 6 ) ppm V ref (T a = 25℃) α V ref ( )= ℃ ΔT a ( Example : △Vref = 30mV and the slope is positive, △Vref @ 25℃ = 2.495V △Ta = 70℃ 0.03 ( ) × 10 6 ppm 2.495 αVref ( )= = 171ppm / ℃ ℃ 70 3. The dynamic impedance ZKA is defined as: Ζ KA = ΔVKA ΔI K When the device is operating with two external resistors, R1 and R2, (refer to Fig.2) the total dynamic impedance of the circuit is given by: Ζ KA ' = Ζ KA × (1 + R1 ) R2 KSD-I0A013-006 4 SN431/SNF431 ◈ Electrical Characteristic Curves Fig.4 Vref vs TA [%] 0.8 Fig.5 Iref vs TA Reference Input Current - Iref [µA] 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -60 -40 -20 0 20 40 60 80 100 1.0 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 -60 -40 -20 0 20 40 60 80 100 Reference Voltage Change - Vref VKA=Vref IK=10mA IK=10mA R1=10KΩ R2=∞ Ambient Temperature - TA [℃] Ambient Temperature - TA [℃] Fig.6 IKA vs VKA 150 125 100 75 50 25 0 -25 -50 -75 -100 -125 -150 -2 800 Fig.7 IKA vs VKA 700 600 500 400 300 200 100 0 -100 -200 -1 0 1 2 3 Cathode Current - IKA [mA] TA=25℃ Cathode Current - IKA [µA] VKA=Vref VKA=Vref TA=25℃ -1 0 1 2 3 Cathode Voltage - VKA [V] Fig.8 Ioff vs TA Delta Reference Voltage - △Vref [mV] Off-State Cathode Current - Ioff [nA] 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -60 -40 -20 0 20 40 60 80 100 0 -5 -10 -15 -20 -25 0 4 Cathode Voltage - VKA [V] Fig.9 △Vref vs VKA VKA= 36V Vref=0V IK=10mA TA=25℃ 8 12 16 20 24 28 32 36 40 Ambient Temperature - TA [℃] Cathode Voltage - VKA [V] KSD-I0A013-006 5 SN431/SNF431 ◈ Electrical Characteristic Curves Fig.10 AV vs f 60 OUTPUT IK=10mA 50 Voltage Gain - AV [dB] TA=25℃ IK 10kΩ 220Ω 40 30 10μF 10kΩ 20 GND 10 0 1k 10k 100k 1000k 10000k Voltage Gain Test Circuit Frequency - f [Hz] Fig.11 |ZKA| vs f Vout 100 500Ω Rs=100Ω Reference Impedance – |ZKA| [Ω] IK=10mA TA=25℃ 10 IK 1uF Vin GND 1 0.1 1k 10k 100k 1000k 10000k ZKA = Vout/Vin x Rs Frequency - f [Hz] Dynamic Impedance Test Circuit KSD-I0A013-006 6 SN431/SNF431 Fig.12 Pulse Response 220Ω OUTPUT Voltage Swing [V] 0.9V/Div Output Pulse Generator f = 100kHz 50Ω GND 5V/Div Input Pulse Response Test Circuit Time [µS] KSD-I0A013-006 7 SN431/SNF431 ◈ Typical Application Vcc Vcc Vout R1 Vout R2 Vin Vin < Vref -> Vout=Vcc Vin > Vref -> Vout≒2.0V Vout = ( 1 + R1 )Vref R2 Vth=Vref Fig14. Shunt Regulator Fig15. Single-Supply Comparator with Temperature-Compensated Threshold Vcc Isink Iout Vcc RCL Rs Isink = Vref / RS Fig16. Constant Current Sink Iout = Vref / RCL Fig17. Constant Current Source Vcc Vout Vcc Vout R1 R1 R2 R2 Vout = ( 1 + R1 )Vref R2 Vout = ( 1 + R1 )Vref R2 Vin(min) = Vout + Vbe Vout(min) = Vref + Vbe Fig18. Series Pass Regulator Fig19. High Currnet Shunt Regulator KSD-I0A013-006 8 SN431/SNF431 ◈ SOT-89 Outline Dimension (unit : mm) ※ Recommend PCB solder land [Unit: mm] KSD-I0A013-006 9 SN431/SNF431 ◈ SOT-23 Outline Dimension (unit : mm) ※ Recommend PCB solder land [Unit: mm] KSD-I0A013-006 10 SN431/SNF431 ◈ SOT-25 Outline Dimension (unit : mm) ※ Recommend PCB solder land [Unit: mm] KSD-I0A013-006 11 SN431/SNF431 ◈ TO-92 Outline Dimension (unit : mm) KSD-I0A013-006 12 SN431/SNF431 ◈ TO-92M Outline Dimension (unit : mm) KSD-I0A013-006 13 SN431/SNF431 The AUK Corp. products are intended for the use as components in general electronic equipment (Office and communication equipment, measuring equipment, home appliance, etc.). Please make sure that you consult with us before you use these AUK Corp. products in equipments which require high quality and / or reliability, and in equipments which could have major impact to the welfare of human life(atomic energy control, airplane, spaceship, transportation, combustion control, all types of safety device, etc.). AUK Corp. cannot accept liability to any damage which may occur in case these AUK Corp. products were used in the mentioned equipments without prior consultation with AUK Corp.. Specifications mentioned in this publication are subject to change without notice. KSD-I0A013-006 14