AP432

AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Features • Precision reference voltage AP432 : 1.24V ± 1% AP432A : 1.24V ± 0.5% Sink current capability: 200mA Minimum cathode current for regulation: 150µA o Equivalent full-range temp coefficient: 30 ppm/ C Fast turn-on response Low dynamic output impedance: 0.2Ω Programmable output voltage to 20V Low output noise Packages: SOT23, SOT23R, SOT25, SC59 (W package code), SC59 (R package code), SOP-8L and TO92-3L SOT23, SOT23R, SOP-8L and SC59: Available in “Green” Molding Compound (No Br, Sb) (Note 1) Lead Free Finish/ RoHS Compliant for Lead Free and “Green” Products (Note 2) General Description The AP432/432A are 3-terminal adjustable precision shunt regulators with guaranteed stable temperature over the applicable extended commercial temperature range. The output voltage may be set at any level greater than 1.24\/ (VREF) up to 20V 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 AP432/432A 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. • • • • • • • • • • Ordering Information A P 4 3 2X X X X Reference Voltage Tolerance: Blank : +/- 1% A : +/- 0.5% Package Blank : V : SA : : W : R Q : SR : SOP-8L TO92-3L SOT23 SC59 SC59 SOT25 SOT23R Lead-Free L : Lead Free G : Green (Note 1) Packing -B : Bulk -7/-13 : Taping -A : Ammo Box (Note 3) Note: 1. SOT23, SOT23R are “Green” products only. 2. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7. Device (Note 4) AP432(A)SA AP432(A)SR Lead-free 7” Tape and Reel 13” Tape and Reel Ammo Box Package Packaging Part Number Part Number Part Number Code (Note 5) Quantity Quantity Quantity Suffix Suffix Suffix SA SR Q W R SOT23 SOT23R SOT25 SC59 SC59 SOP-8L V TO92-3L 3000/Tape & Reel 3000/Tape & Reel 3000/Tape & Reel 3000/Tape & Reel 3000/Tape & Reel NA NA -7 -7 -7 -7 -7 NA NA NA NA NA NA NA 2500/Tape & Reel NA NA NA NA NA NA -13 NA NA NA NA NA NA NA 2000/Box NA NA NA NA NA NA -A AP432(A)Q AP432(A)W AP432(A)R AP432(A) AP432(A)V Lead-free Notes: 3. Ammo Box is for TO92-3 Spread Lead. 4. Suffix “A” denotes AP432A device. 5. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. AP432/AP432A Rev. 6 1 of 12 MARCH 2007 www.diodes.com © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Pin Assignment Package Pin Configuration (Top View) NC 1 2 4 CATHODE 3 REF Package Pin Configuration (Top View) CATHODE 1 2 3 4 8 7 6 5 REF ANODE ANODE NC 5 ANODE SOP-8L SOT25 NC ANODE ANODE NC SC-59 ( Package Code-W) 3 ANODE 1 2 REF SOT23 CATHODE ANODE 1 3 REF 2 CATHODE 3 SC-59 ( Package Code-R) 3 ANODE 1 2 REF CATHODE SOT23R ANODE 1 2 CATHODE REF 3 Cathode 2 Anode 1 REF AP432/AP432A Rev. 6 + + TO92-3L + 2 of 12 MARCH 2007 www.diodes.com © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Typical Application Circuit V IN V OUT + C in A P 432 R1 + C out R2 V O U T = (1+ R 1/R 2)V R E F P recision R egulator Block Diagram REF (R) + Cathode (C) Anode (A) Cathode (C) Anode (A) 3 of 12 MARCH 2007 VREF Symbol REF (R) AP432/AP432A Rev. 6 www.diodes.com © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Absolute Maximum Ratings Symbol Vcv ICC IREF TOP TST Parameter Cathode Voltage Continuous Cathode Current Reference Input Current Operating Temperature Storage Temperature SOT23(R) SOT25 Power Dissipation SC59 (Notes 6, 7) SOP-8L TO92-3L Rating +20 -10 to +250 10 -20 to +85 -65 to +150 250 250 400 600 780 Unit V mA mA o C o C mW mW mW mW mW PD Note: 6. TJ, max =150°C 7. Ratings apply to ambient temperature at 25°C AP432/AP432A Rev. 6 4 of 12 MARCH 2007 www.diodes.com © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Electrical Characteristics Parameter Reference Voltage Deviation of Reference Input Voltage over Temperature (Note 8) Ratio of the Change in Reference Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current over Temperature Minimum Cathode Current for Regulation Off-state Current Dynamic Output Impedance (Note 9) ( TA = 25oC, V+ = +5.0V, unless otherwise stated ) Test conditions AP432 VKA = Vref, I KA = 10mA (Fig.1) AP432A VKA = VREF , IKA = 10mA , Ta = full range (Fig.1) IKA = 10mA (Fig.2) VKA = 20 ~VREF Symbol VREF VREF Min. 1.227 1.233 Typ. 1.24 3.0 -1.4 1.4 0.4 0.15 0.1 0.2 Max. 1.252 1.246 20 -2.0 3.5 1.2 0.3 1.0 0.5 Unit V mV mV/V µA µA mA µA Ω ∆VREF ∆V KA R1 = 10KΩ,R2 = ∞ IKA= 10mA (Fig.2) R1 = 10KΩ,R2 = ∞ IKA = 10mA Ta = Full range (Fig.2) VKA = VREF (Fig.1) VKA = 20V , VREF = 0V (Fig.3) V KA = VREF Frequency ≤ 1KHz (Fig.1) IREF αIREF IKA(min) IKA(off) Z KA VMAX VDEV = VMAX - VMIN VMIN TI Note: Temperature T2 8. 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 αVREF is defined as: α VREF Where: VDEV ) ⋅10 6 VREF (25°C) ……………………..……………….. ( ppm ) = °C T2 − T1 ( T2 – T1 = full temperature change. αVREF can be positive or negative depending on whether the slope is positive or negative. Note: 9. 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 AP432/AP432A Rev. 6 5 of 12 MARCH 2007 www.diodes.com © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Test Circuits Input IN IN VKA IKA R1 VREF IREF VREF IKA VKA VKA R2 IZ(OFF) Note:VKA=VREF(1+R1/R2)+IREFxR1 Fig 1. Test Circuit for VKA= VREF Fig 2. Test Circuit for VKA > VREF Fig 3. Test Circuit for Off-State Current AP432/AP432A Rev. 6 6 of 12 MARCH 2007 www.diodes.com © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Typical Performance Characteristics 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 15KΩ 9µF Output IKA 232Ω + 8.25KΩ - Test Circuit for Voltage Amplification f-Frequency-Hz 100K 1M 10M Reference Impedance vs Frequency 100 ∣ZKA∣ Reference Impedance (Ω) I KA=10mA o TA =25 C 10 50Ω + 1 0.1 1K 10K 100K 1M 10M f-Frequency-Hz 150Ω I KA CL STABILITY BOUNDARY CONDITIONS† 100 90 80 IKA-Cathode Current-mA 70 60 50 40 30 20 10 0 0.001 0.01 0.1 1 CL-Load Capacitance-µF 10 CL R2 A VKA=Vref B VKA=5V C VKA=10V D VKA=15V B TA=25oC Stable Stable A C Test Circuit for Curve A D R1=10KΩ 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 VKA a nd I KA c onditions with CL =0.V BATT a nd CL were then adjusted to determine the ranges of stability. Test Circuit for Curve B, C, and D AP432/AP432A Rev. 6 7 of 12 www.diodes.com 1KΩ + - + GND Output I KA GND Test Circuit for Reference Impedance VBATT I KA 150Ω + - VBATT MARCH 2007 © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Application Examples V IN VIN R CL R R1A R1B V IN I OUT ON R2A R2B OFF + LED on when Low Limit < V < High Limit IN (1+R1B/R2B) Low Limit ≈ V REF (1+R1A/R2A) High Limit ≈ V REF Delay = RC x ln ( VIN V -V IN ) I OUT = V REF / RCL REF Fig. 4 Voltage Monitor V IN I OUT Fig. 5 Delay Timer Fig. 6 Current Limiter or Current Source V IN V OUT VIN PUSE R1 V OUT R1 RS R2 R2 I OUT = V REF / RS V OUT = (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 Limit