AP432_10

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 Equivalent full-range temp coefficient: 30 ppm/oC Fast turn-on response Low dynamic output impedance: 0.2Ω Programmable output voltage to 20V Low output noise Lead Free packages: SOT25, SC59, SC59R, SOT89-3L and TO92-3L SOT23, SOT23R, SOT25, SC59, SC59R, SOP-8L, SOT89-3L and TO92-3L: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) Description The AP432 and AP432A 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/AP432A 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. • Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 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 AP432/AP432A Document number: DS31003 Rev. 16 - 2 1 of 14 www.diodes.com June 2010 © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Pin Assignments (1) SOT25 (2) SOP-8L (Top View) NC NC CATHODE 1 2 3 4 REF 5 ANODE (Top View) CATHODE ANODE ANODE NC 1 2 3 4 8 7 6 5 REF ANODE ANODE NC (3) SC59 (4) SC59R (Top View) 3 REF ANODE 1 2 CATHODE (Top View) 3 ANODE 1 2 REF CATHODE (5) SOT23 (6) SOT23R (Top View) 3 ANODE 1 2 CATHODE REF ANODE (Top View) 3 1 2 REF CATHODE (7) SOT89-3L (8) TO92-3L (Top View) (Top View) + 3 Cathode 2 Anode 1 REF 1 2 3 REF Anode Cathode AP432/AP432A Document number: DS31003 Rev. 16 - 2 2 of 14 www.diodes.com + + June 2010 © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Functional Block Diagram REF (R) + Cathode (C) Anode (A) VREF Symbol Cathode (C) REF (R) Anode (A) 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 SC59(R) SOP-8L SOT89-3L TO92-3L Rating +20 -10 to +250 10 -20 to +85 -65 to +150 400 550 400 600 800 780 Unit V mA mA o C o C mW mW mW mW mW mW PD Power Dissipation (Notes 2, 3) Notes: 2. TJ, max =150°C. 3. Ratings apply to ambient temperature at 25°C. AP432/AP432A Document number: DS31003 Rev. 16 - 2 3 of 14 www.diodes.com June 2010 © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Electrical Characteristics (TA = 25oC, V+ = +5.0V, unless otherwise stated) Symbol VREF VREF ΔVREF ΔVKA IREF αIREF IKA(MIN) IKA(OFF) |ZKA| Parameter Reference voltage Deviation of Reference input voltage over temperature (Note 4) 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 5) 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 Min 1.227 1.233 ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ ⎯ Typ. 1.24 3.0 Max 1.252 1.246 20 Unit V mV -1.4 1.4 0.4 0.15 0.1 0.2 -2.0 3.5 1.2 0.3 1.0 0.5 mV/V μA μA mA μA Ω R1 = 10KΩ,R2 = ∞ IKA= 10mA (Fig. 2) R1 = 10KΩ,R2 = ∞ IKA = 10mA Ta = Full range (Fig. 2) VKA = VREF (Fig.1) VKA = 36V, VREF = 0V (Fig. 3) V KA = VREF V KA = VREF ΔIKA = 0.1mA ~ 15mA Frequency ≤ 1KHz (Fig.1) VMAX VDEV = VMAX - VMIN VMIN TI Notes: Temperature T2 4. 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) = T2 − T1 ( ……………………..……………….. ( ppm °C ) T2 – T1 = full temperature change. αVREF can be positive or negative depending on whether the slope is positive or negative. Notes: 5. The dynamic output impedance, RZ, is defined as: Z KA = Δ V KA Δ 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 = ' Δv ≈ Z KA Δi (1 + R1 ) R2 June 2010 © Diodes Incorporated AP432/AP432A Document number: DS31003 Rev. 16 - 2 4 of 14 www.diodes.com AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Test Circuits Input IN IN VKA IKA R1 VREF R2 IREF VREF IKA VKA VKA 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 Typical Performance Characteristics AP432/AP432A Document number: DS31003 Rev. 16 - 2 5 of 14 www.diodes.com June 2010 © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Typical Performance Characteristics (Continued) Small-Signal Voltage Amplification vs Frequency 60 AV-Small Signal Voltage Amplification (dB) 50 IKA=10mA TA=25oC 15KΩ 9μF Output IKA 232Ω 40 30 20 Test Circuit for Voltage Amplification 10 0 1K 10K 100K 1M 10M f-Frequency-Hz 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 STABILITY BOUNDARY CONDITIONS† 100 A VKA=Vref 90 80 IKA-Cathode Current-mA 70 60 Stable 50 40 30 20 10 0 0.001 0.01 0.1 1 CL-Load Capacitance-µF 10 CL TA=25oC CL B VKA=5V C VKA=10V D VKA=15V B Stable C A 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 and IKA conditions with CL=0.VBATT and CL were then adjusted to determine the ranges of stability. AP432/AP432A Document number: DS31003 Rev. 16 - 2 6 of 14 www.diodes.com 8.25KΩ + - + GND 1KΩ Output I KA GND Test Circuit for Reference Impedance 150Ω I KA + VBATT I KA 150Ω + R2 VBATT Test Circuit for Curve B, C, and D June 2010 © Diodes Incorporated AP432/AP432A ADJUSTABLE PRECISION SHUNT REGULATOR Application Examples V IN VIN RCL R R1A R1B VIN I OUT ON R2A R2B OFF + LED on when Low Limit