CM431AGACM235

CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR GENERAL DESCRIPTION The CM431A is a three-terminal adjustable shunt voltage regulator with specified thermal stability and pin-to-pin compatible with the earlier 431 series. The output voltage can be adjusted to any value between VREF and 18V by using two external resistors. The CM431A offers low output impedance for improved load regulation with a typical output impedance of 200mΩ. Because of the active output circuitry, the CM431A can replace the zener diodes in applications such as switching power supplies, OVP crowbar 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 FEATURES Initial voltage reference accuracy of 1.0%. Sink current capability from 1mA to 100mA Typical output dynamic impedance less than 200mΩ; Adjustable output voltage from VREF to 18V Available in SOT-23, SOT-89, TO-92, & SOP-8 Low output noise Typical equivalent full range temperature coefficient of 30ppm/ OC APPLICATIONS PIN CONFIGURATION TO-92 Front View CATHODE SOT-23-3 Top View 3 REF ANODE CM431AXCM233 CM431AXCM2R3 Pin 1 Pin 2 Pin 3 1 2 REF CATHODE ANODE CATHODE REF ANODE Suffix “X”: Grade “A”, “B”, “C”, “D”, or “E” 1 2 3 SOT-23-5 Top View 5 4 SOT-89 Top View 1 SOP-8 Top View C OE ATH D N C N C N C R EF N C AN D OE N C 8 7 6 5 CATHODE REF CATHODE ANODE REF ANODE 2 3 4 NC NC 1 2 3 1 2 3 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 1 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR TYPICAL APPLICATION V+ Rb R1 27.5K 0.1% R2 27.5K 0.1% VREF ANODE 5V Precision Regulator VO = 5V CATHODE BLOCK DIAGRAM REF Note: Rb should provide cathode current ≥ 1mA + - 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 2 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR ORDERING INFORMATION PACKAGE 0.5% SOT-23-3（1） SOT-23-3（1） SOT-23-5（1） SOT-89（1） TO-92（2） SOP-8 SOT-23-3（1） SOT-23-3（1） SOT-23-5（1） SOT-89（1） TO-92（2） SOP-8 Notes： （1） Add suffix ″TR″for Tape & Reel. （2） Add suffix ″TA″for Tape Ammo. （3） CM431AACM233 CM431AACM2R3 CM431AACM235 CM431AACM89 CM431AACN CM431AACS CM431AGACM233* CM431AGACM2R3* CM431AGACM235* CM431AGACM89* CM431AGACN* CM431AGACS* 1.0% CM431ABCM233 CM431ABCM2R3 CM431ABCM235 CM431ABCM89 CM431ABCN CM431ABCS CM431AGBCM233* CM431AGBCM2R3* CM431AGBCM235* CM431AGBCM89* CM431AGBCN* CM431AGBCS* TOLERANCE 1.5% CM431AECM233 CM431AECM2R3 CM431AECM235 CM431AECM89 CM431AECN CM431AECS CM431AGECM233* CM431AGECM2R3* CM431AGECM235* CM431AGECM89* CM431AGECN* CM431AGECS* TR=3K TR=3K TR=3K TR=1K TA=2K T/R Quantity TR=3K TR=3K TR=3K TR=1K TA=2K *Note: Add suffix “G” for Pb Free Product 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 3 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR ABSOLUTE MAXIMUM RATINGS Cathode to Anode Voltage (VKA) (Note 2) Continuous Cathode Current (IK) Reference Input Current (IREF) Maximum junction temperature range, TJ Storage temperature range Lead temperature (soldiering, 10 seconds) Note 1: Note 2: Currents are positive into, negative out of the specified terminal. Voltage values are with respect to the anode terminal unless otherwise noted. -0.3V to 18V -100mA to 150mA -50uA to 10mA 150 OC -65OC to 150OC 260 OC Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. POWER DISSIPATION TABLE Package SOP-8 TO-92 SOT-89 θJA ( C/W ) O Derating factor ( mW/OC ) TA≧25 OC 6.06 6.41 14.1 TA≦25 OC Power rating(mW) 757 801 1763 TA=70 OC Power rating(mW) 485 513 1128 TA= 85 OC Power rating (mW) 394 417 916 228 TA= 105 OC Power rating (mW) 272 288 635 158 165 156 71(note) SOT-23 285 3.5 438 280 Note : 1. For SOT-89 package, Thermal Resistance-Junction to Tab ( θJT ) = 35 OC/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. RECOMMENDED OPERATING CONDITIONS Min Operating free air temperature range, TA Cathode current, IK Cathode voltage, VKA 0 1 0 Max 105 100 16 Units O C mA V 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 4 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over the operating ambient temperatures with TA = 25°C. Parameter Symbol Test Conditions IK = 10mA, VKA = VREF ,0.5% CM431A Min 2.488 2.475 2.463 Typ 2.5 2.5 2.5 4 -1.4 2 0.4 0.1 0.2 Max 2.512 2.525 2.537 17 -2.7 4 2.3 1 1 0.5 Units V V V mV mV/V μA mA μA Ω Reference Input Voltage Reference Drift Voltage Ratio, Ref to Cathode (note 4) Reference Input Current Minimum Operating Current Off-State Cathode Current Dynamic Impedance VREF IK = 10mA, VKA = VREF ,1.0% IK = 10mA, VKA = VREF ,1.5% IK = 10mA, VKA = VREF, 0OC ≤ TA ≤ 70 OC IK = 10mA, VKA = 2.5V to 18V IREF IMIN IOFF |ZKA | IK = 10mA,VKA = VREF IK = 10mA,VKA = VREF, 0OC ≤ TA ≤ 70 OC VKA = VREF VKA = 18V, VREF = 0V 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 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 5 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR PARAMETER MEASUREMENT INFORMATION Input VKA Input VKA R1 IREF R2 VRE EF (1 + R1/R2) + IREF x R1 Figure 1. Test Circuit for VKA = VREF Figure 2. Test Circuit for VKA > VREF Input VKA IOFF Figure 3. Test Circuit for IOFF 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 6 CM431A 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 Stability Boundray Conditions 100 90 IKA-Cathode Current (mA) 80 70 60 50 40 30 20 10 0 0.001 D A C Stable B Stable 0.01 0.1 1 CL-Load Capacitance(uF) 10 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 7 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR APPLICATION INFORMATION VBATT R* VO R1 0.1% VREF R2 0.1% Input VBATT CM431A CM431A VO Von ≈ 2V Voff ≈ VBATT Vth = 2.5V GND VO = (1 + R1/R2) × VREF Note: R should provide 1mA cathode current to the CM431A of minimum VBATT Figure 4. Shunt Regulator Figure 5. Single –Supply Comparator With Temperature compensated threshold. VBATT VO VBATT R1 CM431A R2 C VO R1 R2 CM431A VO = (1 + R1/R2) × VREF Figure 6. High-Current Shunt Regulator Figure 7. Crowbar Circuit 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 8 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR APPLICATION INFORMATION (continued) VO = 5V/1.5A VBATT VBATT 8.2KΩ LM317 Adjust IO = VREF/RS 243Ω 0.1% CM431A 243Ω 0.1% RS 0.1% CM431A Figure 8.Precision 5V, 1.5A Regulator Figure 9. Precision Constant Current Sink VBATT IN 78L05 OUT VO VBATT RCL 0.1% IO Common CM431A R1 R1 R2 CM431A IOUT = (VREF/RCL) + IKA VO = (1 + R1/R2) × VREF Min VO = VREF + 5V Figure 10. Output Control of a Three-Terminal Fixed Regulator Figure 11. Precision Current Limiter R1 = VBATT/((IO/hFE) + IKA) 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 9 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR PACKAGE DIMENSION TO-92 θ A A1 b D D1 A E L e θ θ1 A1 E L b D e SOT-23-3 D 3 b1 c1 With Plating A c A1 A2 E1 b Base Metal Section B-B E b b1 c c1 D E 1 e e1 2 E1 b L L1 e e1 θ1 θ θ1 θ2 A2 A θ2 A1 See Section B-B 2006/10/11 Rev1.2 Champion Microelectronic Corporation θ L L1 θ1 D1 Page 10 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR PACKAGE DIMENSION (CONTINUED) SOT-23-5 D 5 4 b1 c1 With Plating A c A1 A2 E1 b Base Metal Section B-B E b b1 c c1 D E 1 2 3 e e1 E1 b L L1 e e1 θ1 θ θ1 θ2 A2 A θ2 A1 See Section B-B SOT-89 D D1 φ1.0 E H θ L L1 L 5° C e e1 A 8° L b b1 C D D1 H E e1 b b1 b e 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 11 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR PACKAGE DIMENSION (CONTINUED) 8-PIN SOP (S08) PIN 1 ID θ θ 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 12 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR NUMBERING SCHEME Ordering Number: CM431AXYZ (note1) Ordering Number: CM431AGXYZ (note2) note1: X : Suffix for Reference Voltage Tolerance (note 3) Y : Suffix for Temperature Range (note 4) Z : Suffix for Package Type (note 5) note2: G : Suffix for Pb Free Product X : Suffix for Reference Voltage Tolerance (note 3) Y : Suffix for Temperature Range (note 4) Z : Suffix for Package Type (note 5) note 3: see the Reference Voltage Tolerance Suffix Table note 4: Y= C: 0℃~+105℃ note 5: Z is single alphabet with or without digits M233 : SOT-23-3 (TR only) M2R3: SOT-23-3 (TR only) but pin assignment is different with M233 M235 : SOT-23-5 (TR only) M89:SOT-89(TR only) N:TO-92(TA only) S:SOP-8(TR only) Reference Voltage Tolerance Suffix Table Tolerance 0.5% 1% 1.5% Suffix A B E 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 13 CM431A 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 5F, No. 11, Park Avenue II, Science-Based Industrial Park, HsinChu City, Taiwan T E L : +886-3-5679979 F A X : +886-3-5679909 Sales & Marketing 7F-6, No.32, Sec. 1, Chenggong Rd., Nangang District, Taipei City 115, Taiwan, R.O.C. T E L : +886-2-2788 0558 F A X : +886-2-2788 2985 2006/10/11 Rev1.2 Champion Microelectronic Corporation Page 14