RC0431A FAIRCHILD | Alldatasheet
Document overview
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Technical content
Features
- L ow voltage operation to 1.24V
- 1% reference voltage tolerance
- Output voltage adjustable from Vref to 12V
- L ow 80µA operational cathode current
- 0.25Ω typical output impedance
- T O-92, SOT23-3 and SOT23-5 packages
Applications
- V oltage reference for discrete power circuits
Description
The RC0431A is a low-voltage 3-terminal adjustable precision voltage reference regulator. It has an excellent thermal stability over the standard commercial temperature range. The output voltage can be set to any value between Vref (1.24V) and 12V using two external resistors. The RC0431A operates from a lower voltage (1.24V) than the traditional shunt regulator references which operate from 2.5V . When used with an optocoupler, the RC0431A will be an ideal voltage reference in an isolated feedback circuit for use in switched-mode power supplies and modular DC-DC converters. The RC0431A has a low output impedance of active output circuitry offering a very sharp turn-on characteristic. The RC0431A will be an excellent replacement for low-voltage zener diodes in many applications such as on-board regulation and adjustable power supplies. Symbol Block Diagram RC0431A (RC431A) Low-Voltage Adjustable Precision Shunt Regulator REF 65-431A-01 Anode Cathode Vref = 1.24V REF + CATHODE ANODE 65-431A-02
RC0431A (RC431A) PRODUCT SPECIFICATION Pin Assignments Equivalent Schematic Absolute Maximum Ratings Ratings are over full operating free-air temperature range unless otherwise noted. Notes: 1. Functional operation under these conditions is not implied. Permanent damage may occur if the device is subjected to conditions outside these ratings. Recommended Operating Conditions Cathode voltage, VKA 13.2V Continuous cathode current IK –20mA to 20mA Reference current, Iref –0.05mA to 3mA Power dissipation See Dissipation Rating Table Storage temperature range -65 ° to 150°C Parameter Min. Max. Units Cathode voltage, V KA V REF 12 V Cathode current, IK 0.1 15 mA Operating temperature range in free-air, TA 07 0 °C NC CATHODE ANODE REF NC NC = No internal connection 65-431A-03 SOT-23 PACKAGE (5-Lead) (TOP VIEW) CATHODE ANODE REF SOT-23 PACKAGE (3-Lead) (TOP VIEW) TO-92 PACKAGE (TOP VIEW) ANODE CATHODE REF A REF CATHODE 65-431A-04 ANODE
PRODUCT SPECIFICATION RC0431A (RC431A) Dissipation Rating Table Electrical Specifications TA = 25°C (unless otherwise noted), at free-air Notes: 1. Functional operation under these conditions is not implied. Permanent damage may occur if the device is subjected to conditions outside these ratings. 2. Full temperature range is 0 °C to 70°C. 3. The deviation parameters V ref(dev) and Iref(dev) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average full-range temperature coefficient of the reference input voltage, ref, is defined as: where ∆TA is the rated operating free-air temperature range of the device. ∞Vref can be positive or negative depending on whether minimum Vref or maximum Vref, respectively, occurs at the lower temperature. 4. The dynamic impedance is defined as: ZKA= ∆VKA/ ∆IK When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: Package Power Rating TA ≤ 25°C Derating Factor TA ≥ 25°C Power Rating TA = 70°C TO-92 775mW 6.2mW/ OC 496mW SOT23-5 150mW 1.2mW/ oC 96mW Symbol Parameters Conditions Min. Typ. Max. Units Vref Reference Voltage V KA = Vref, TA = 25°C 1.228 1.24 1.252 V IK = 10mA, TA = 0 to 70°C 1.221 1.259 Vref (dev) Vref deviation over full temperature range (see note 2) VKA = Vref, IK = 10mA, See note 2 and Figure 1. 41 2 m V ∆Vref ∆VKA Ratio of Vref change in cathode voltage change IK = 10mA, ∆VKA = Vref to 6V. See figure 2. -1.5 -2.7 mV V Iref Reference terminal current I K = 10mA, R1 = 10KΩ, R2 = ∞ See figure 2. 0.15 0.5 µA Iref(dev) Iref deviation over full temperature range (see note 2) IK = 10mA, R1 = 10KΩ, R2 = ∞ See note 1 & figure 2. 0.05 0.3 µA IK(min) Minimum cathode current for regulation VKA = Vref See figure 1. 55 80 µA Ioff Off-state cathode current V KA = 6V, Vref = 0 See figure 3. 0.001 0.1 µA |ZKA| Dynamic impedance (see note 3) V KA = Vref, f ≤ 1KHz IK = 0.1mA to 15mA, See figure 1. 0.25 0.4 Ω ∞Vref ppm/°C〈〉 Vref dev() Vref TA 25°C=〈〉⁄{} 106× ∆TA ZKA ×≈=
RC0431A (RC431A) PRODUCT SPECIFICATION Mechanical Dimensions A .170 .210 Symbol Inches Min. Max. Min. Max. Millimeters Notes b .015 .021 .020c .014 øD .175 .205 e1 .045 .055 L α α 4° 6° .500 — .080 .115S E .125 .165 4.32 5.33 .38 .53 .51.36 4.45 5.21 1.14 1.40 4° 6° 12.70 — 2.03 2.92 3.18 4.19 e .095 .105 2.41 2.67 Notes: Package outline exclusive of any mold flashes dimension. Package outline exclusive of burr dimension. c S E øD A E-PIN C 1/16 L b e
PRODUCT SPECIFICATION RC0431A (RC431A) Mechanical Dimensions (continued) SOT23 5-Lead eB D A L c E H A .035 .057 Symbol Inches Min. Max. Min. Max. Millimeters Notes A1 .000 .006 .020B .008 c .003 .010 E .059 .071 e H .087 .126 .037 BSC .075 BSC 0 10 L D .106 .122 .90 1.45 .00 .15 .50.20 .08 .25 1.50 1.80 2.20 3.20 .004 .024 .10 .60 .95 BSC
1.90 BSC
2.70 3.10 Notes: Package outline exclusive of mold flash & metal burr. Package outline exclusive of solder plating. EIAJ Ref Number SC-74A.
RC0431A (RC431A) PRODUCT SPECIFICATION Mechanical Dimensions (continued) SuperSOT™-3 Package SuperSOT-3 (FS PKG Code 32) 1 : 1 Scale 1:1 on letter size paper Di mensions shown below are in: inches [millimeters] Part Weight per unit (gram): 0.0097
RC0431A (RC431A) PRODUCT SPECIFICATION 8/5/03 0.0m 002 Stock#DS3000431A 2003 Fairchild Semiconductor Corporation LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.