CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR GENERAL DESCRIPTION FEATURES The CM431 is a three-terminal adjustable shunt voltage regulator ! Initial voltage reference accuracy of 1.0%. with specified thermal stability and pin-to-pin compatible with the ! Sink current capability from 1mA to 100mA earlier 431 series. The output voltage can be adjusted to any ! Typical output dynamic impedance less than 200mΩ; value between VREF and 36V by using two external resistors. The ! Adjustable output voltage from VREF to 36V CM431 offers low output impedance for improved load regulation ! Available in SOT-23, SOT-89, TO-92, & SOP-8 with a typical output impedance of 200mΩ. Because of the ! Low output noise active output circuitry, the CM431 can replace the zener diodes in ! Typical equivalent full range temperature coefficient of O applications such as switching power supplies, OVP crowbar 30ppm/ C APPLICATIONS circuits, references for A/D, D/A converters with improved turn-on characteristics. ! Voltage Reference ! Precision shunt regulator ! High current shunt regulator ! PWM down converter with reference ! Voltage monitor PIN CONFIGURATION TO-92 Front View SOT-23-3 Top View CATHODE ANODE REF 3 1 1 2 CM431XCM233 CM431XCM2R3 Pin 1 REF CATHODE Pin 2 CATHODE REF Pin 3 ANODE ANODE Suffix “X”: Grade “A”, “B”, “C”, or “D” 2 3 SOT-23-5 SOT-89 Top View Top View NC NC 1 1 2 2 CATHODE ANODE REF CATHO D E REF 4 ANO DE 5 SOP-8 Top View 1 CATHODE REF 8 2 NC NC 7 3 NC ANODE 6 4 NC NC 5 3 3 2003/03/24 Preliminary Rev.1.1 Champion Microelectronic Corporation Page 1 CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR TYPICAL APPLICATION BLOCK DIAGRAM VO = 5V V+ CATHODE Rb R1 27.5K 0.1% Note: Rb should provide cathode current ≥ 1mA + REF - R2 27.5K 0.1% VREF ANODE 5V Precision Regulator ORDERING INFORMATION PACKAGE TOLERANCE 0.5% 0.7% 1.0% T/R Quantity CM431ACM233 CM431DCM233 CM431BCM233 TR=3K CM431ACM2R3 CM431DCM2R3 CM431BCM2R3 TR=3K CM431ACM89 CM431DCM89 CM431BCM89 TR=1K TO-92 CM431ACN CM431DCN CM431BCN TA=2K SOP-8 CM431ACS CM431DCS CM431BCS （1） SOT-23 （1） SOT-23 （1） SOT-89 （2） Notes： （1） Add suffix ″TR″for Tape & Reel. （2） Add suffix ″TA″for Tape Ammo. 2003/03/24 Preliminary Rev.1.1 Champion Microelectronic Corporation Page 2 CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR ABSOLUTE MAXIMUM RATINGS Cathode to Anode Voltage (VKA) (Note 2) -0.3V to 37V Continuous Cathode Current (IK) -100mA to 150mA Reference Input Current (IREF) -50uA to 10mA Maximum junction temperature range, TJ 150 C O O O Storage temperature range -65 C to 150 C Lead temperature (soldiering, 10 seconds) 260 OC Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. Note 2: Voltage values are with respect to the anode terminal unless otherwise noted. POWER DISSIPATION TABLE θJA ( C/W ) Derating factor ( mW/ C ) O TA≧25 C TA≦25 C Power rating(mW) TA=70 C Power rating(mW) TA= 85 C Power rating (mW) SOP-8 165 6.06 757 485 394 TO-92 156 6.41 801 513 417 SOT-89 71(note) 14.1 1763 1128 916 Package O O O O O SOT-23 285 3.5 438 280 Note : O 1. For SOT-89 package, Thermal Resistance-Junction to Tab ( θJT ) = 35 C/W. TJ = TTAB + (PD x θJT) 2. θJA: Thermal Resistance-Junction to Ambient Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/PC-board system. All of the above assume no ambient airflow. 228 RECOMMENDED OPERATING CONDITIONS Min Max Operating free air temperature range, TA 0 105 O Cathode current, IK 1 100 mA Cathode voltage, VKA 0 36 V 2003/03/24 Preliminary Rev.1.1 Champion Microelectronic Corporation Units C Page 3 CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over the operating ambient temperatures with TA = 25°°C. Parameter Reference Input Voltage Symbol VREF CM431 Test Conditions Typ Max IK = 10mA, VKA = VREF ,0.5% 2.482 2.495 2.507 V IK = 10mA, VKA = VREF ,0.7% 2.478 2.495 2.512 V IK = 10mA, VKA = VREF ,1.0% 2.470 2.495 2.520 V 4 17 mV -1.4 -2.7 mV/V 2 4 µA IK = 10mA, VKA = VREF, 0 C ≤ TA ≤ 70 C O Reference Drift Voltage Ratio, Ref to Cathode Reference Input Current O IK = 10mA, VKA = 2.5V to 36V (note 4) IREF Units Min IK = 10mA,VKA = VREF IK = 10mA,VKA = VREF, 0 C ≤ TA ≤ 70 C O O 2.3 Minimum Operating Current IMIN VKA = VREF 0.4 1 mA Off-State Cathode Current IOFF VKA = 36V, VREF = 0V 0.1 1 µA Dynamic Impedance |ZKA | 0.2 0.5 Ω VKA = VREF, IK = 1mA to 100mA, f ≤ 1kHz Note 3: These parameters are guaranteed by design Note 4: VREF VKA Ratio of change in reference input voltage to the change in cathode voltage 2003/03/24 Preliminary Rev.1.1 Champion Microelectronic Corporation Page 4 CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR PARAMETER MEASUREMENT INFORMATION Input VKA Input VKA R1 IREF R2 VRE (1 + R1/R2) + IREF x R1 Figure 1. Test Circuit for VKA = VREF Input Figure 2. Test Circuit for VKA > VREF VKA IOFF Figure 3. Test Circuit for IOFF 2003/03/24 Preliminary Rev.1.1 Champion Microelectronic Corporation Page 5 CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR TYPICAL CHARACTERISTICS Cathode Current vs. Cathode Voltage Cathode Current vs. Cathode Voltage Ref. Input Voltage vs. Free-Air Temperature Ref. Input Current vs. Free-Air Temperature 2003/03/24 Preliminary Rev.1.1 Champion Microelectronic Corporation Page 6 CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR APPLICATION INFORMATION VBATT R* VO R1 0.1% VBATT CM431 CM431 VREF Von ≈ 2V Voff ≈ VBATT Input R2 0.1% VO Vth = 2.5V GND VO = (1 + R1/R2) × VREF Note: R should provide 1mA cathode current to the CM431 of minimum VBATT Figure 5. Single –Supply Comparator With Temperature compensated threshold. Figure 4. Shunt Regulator VBATT VO VBATT VO R1 R1 CM431 R2 CM431 C R2 VO = (1 + R1/R2) × VREF Figure 6. High-Current Shunt Regulator 2003/03/24 Preliminary Rev.1.1 Figure 7. Crowbar Circuit Champion Microelectronic Corporation Page 7 CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR APPLICATION INFORMATION (continued) VBATT VO = 5V/1.5A LM317 VBATT IO = VREF/RS Adjust 8.2KΩ 243Ω 0.1% CM431 CM431 RS 0.1% 243Ω 0.1% Figure 8.Precision 5V, 1.5A Regulator VBATT Figure 9. Precision Constant Current Sink RCL 0.1% IN 78L05 Common OUT VBATT VO R1 IO R1 CM431 R2 CM431 IOUT = (VREF/RCL) + IKA R1 = VBATT/((IO/hFE) + IKA) VO = (1 + R1/R2) × VREF Min VO = VREF + 5V Figure 10. Output Control of a Three-Terminal Fixed Regulator 2003/03/24 Preliminary Rev.1.1 Figure 11. Precision Current Limiter Champion Microelectronic Corporation Page 8 CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR 3-Pin Plastic TO-92 Package Dimension INCHES MIN B TYP MILLIMETERS MAX MIN TYP MAX A 0.175 0.180 0.205 4.45 4.57 5.21 B 0.170 0.180 0.210 4.32 4.57 5.33 C 0.125 0.142 0.165 3.18 3.62 4.19 K A G F C F - 0.015 - - 0.38 - G - 0.050 - - 1.27 - J - 0.150 - - 3.81 - 0.500 0.580 - 12.70 14.73 - K N M - 5º - - 5º - N - 5º - - 5º - 3-Pin Plastic TO-92 Carrier Dimensions P P1 INCHES C MIN TYP MAX MIN TYP MAX - - 2.00 - - P 0.480 0.500 0.520 12.2 12.7 13.2 Po 0.488 0.500 0.512 12.4 12.7 13.0 Do 0.150 0.157 0.165 3.8 4.0 4.2 P1 0.230 0.250 0.256 5.85 6.35 6.85 Fo 0.165 0.197 0.220 4.2 5.0 5.6 W 0.669 0.709 0.748 17.0 18.0 19.0 Ho 0.610 0.630 0.649 15.5 16.0 16.5 Wo 0.224 0.236 0.248 5.7 6.0 6.3 W1 0.335 0.354 0.374 8.5 9.0 9.5 C 0.079 Ho W1 Wo W F1 Do Po Fo MILLIMETERS Note: For TO-92, 2,500 units per ammo 2003/03/24 Preliminary Rev.1.1 Champion Microelectronic Corporation Page 9 CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR Surface Mount SOT-23 INCHES MIN D C L MIN TYP MAX 0.039 0.043 0.051 1.00 1.10 1.30 0.004 0.00 - 0.10 A2 0.028 0.032 0.035 0.70 0.80 0.90 0.014 0.016 0.020 0.35 0.40 0.50 C 0.004 0.005 0.010 0.10 0.15 0.25 D 0.106 0.114 0.122 2.70 2.90 3.10 E 0.055 0.063 0.071 1.40 1.60 1.80 e 0.075 TYP. A1 0.000 H E MAX A TYP MILLIMETERS b - M e A A2 A1 b 1.90 TYP. H 0.102 0.110 0.118 2.60 2.80 3.00 L 0.015 - - 0.37 - - M 1° 5° 9° 1° 5° 9° Surface Mount SOT-23 Carrier Dimensions A B MILLIMETERS M E D A 4.0 ± 0.1 M 1.5 ± 0.1 B 2.0 ± 0.05 N 1.1 ± 0.1 C 4.0± 0.1 D 2.5 ± 0.05 E 1.75 ± 0.1 F 6.0 ± 0.2 F N C DIRECTION OF FEED 2003/03/24 Preliminary Rev.1.1 Champion Microelectronic Corporation Page 10 CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR SOT-89 Package Dimension D D1 L 5° H E φ1.0 C e e1 A 8° L b b1 C D D1 H E e1 b b1 e b 8-Pin Plastic S.O.I.C. PIN 1 ID θ θ 2003/03/24 Preliminary Rev.1.1 Champion Microelectronic Corporation Page 11 CM431 LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR IMPORTANT NOTICE Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of CMC products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer’s applications, the customer should provide adequate design and operating safeguards. HsinChu Headquarter Sales & Marketing 5F, No. 11, Park Avenue II, Science-Based Industrial Park, HsinChu City, Taiwan T E L : +886-3-5679979 FA X : +886-3-5679909 11F, No. 306-3, Sec. 1, Ta Tung Rd., Hsichih, Taipei Hsien 221 Taiwan, R.O.C. T E L : +886-2-86921591 F A X : +886-2-86921596 2003/03/24 Preliminary Rev.1.1 Champion Microelectronic Corporation Page 12