CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR GENERAL DESCRIPTION FEATURES The CM431A is a three-terminal adjustable shunt voltage Initial voltage reference accuracy of 1.0%. regulator with specified thermal stability and pin-to-pin compatible Sink current capability from 1mA to 100mA with the earlier 431 series. The output voltage can be adjusted to Typical output dynamic impedance less than 200mΩ; any value between VREF and 18V by using two external resistors. Adjustable output voltage from VREF to 18V The CM431A offers low output impedance for improved load Available in SOT-23, SOT-89, TO-92, & SOP-8 regulation with a typical output impedance of 200mΩ. Because Low output noise of the active output circuitry, the CM431A can replace the zener Typical equivalent full range temperature coefficient of diodes in applications such as switching power supplies, OVP 30ppm/ OC APPLICATIONS 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 PIN CONFIGURATION TO-92 Front View SOT-23-3 Top View CATHODE ANODE REF 3 CM431AXCM233 CM431AXCM2R3 1 1 2 REF CATHODE Pin 2 CATHODE REF Pin 3 ANODE ANODE Suffix “X”: Grade “A”, “B”, “C”, “D”, or “E” 2 3 SOT-23-5 SOT-89 Top View Top View 2 2 CATHODE ANODE REF CATHODE REF NC NC 1 1 SOP-8 Top View 4 ANODE 5 2004/08/27 Pin 1 1 CATHODE REF 8 2 NC NC 7 3 NC ANODE 6 4 NC NC 5 3 3 Champion Microelectronic Corporation Page 1 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR TYPICAL APPLICATION BLOCK DIAGRAM VO = 5V V+ CATHODE Rb Note: Rb should provide cathode current ≥ 1mA R1 27.5K 0.1% + REF - R2 27.5K 0.1% VREF ANODE 5V Precision Regulator 2004/08/27 Champion Microelectronic Corporation Page 2 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR ORDERING INFORMATION PACKAGE TOLERANCE 0.5% 1.0% 1.5% T/R Quantity SOT-23-3（1） CM431AACM233 CM431ABCM233 CM431AECM233 TR=3K SOT-23-3（1） CM431AACM2R3 CM431ABCM2R3 CM431AECM2R3 TR=3K SOT-23-5（1） CM431AACM235 CM431ABCM235 CM431AECM235 TR=3K SOT-89（1） CM431AACM89 CM431ABCM89 CM431AECM89 TR=1K TO-92（2） CM431AACN CM431ABCN CM431AECN TA=2K SOP-8 CM431AACS CM431ABCS CM431AECS SOT-23-3（1） CM431AGACM233* CM431AGBCM233* CM431AGECM233* TR=3K SOT-23-3（1） CM431AGACM2R3* CM431AGBCM2R3* CM431AGECM2R3* TR=3K SOT-23-5（1） CM431AGACM235* CM431AGBCM235* CM431AGECM235* TR=3K SOT-89（1） CM431AGACM89* CM431AGBCM89* CM431AGECM89* TR=1K TO-92（2） CM431AGACN* CM431AGBCN* CM431AGECN* TA=2K SOP-8 CM431AGACS* CM431AGBCS* CM431AGECS* Notes： （1） Add suffix ″TR″for Tape & Reel. （2） Add suffix ″TA″for Tape Ammo. （3） 2004/08/27 *Note: Add suffix “G” for Pb Free Product Champion Microelectronic Corporation Page 3 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR ABSOLUTE MAXIMUM RATINGS Cathode to Anode Voltage (VKA) (Note 2) -0.3V to 18V Continuous Cathode Current (IK) -100mA to 150mA Reference Input Current (IREF) -50uA to 10mA Maximum junction temperature range, TJ 150 OC Storage temperature range -65OC to 150OC 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/OC ) O TA≧25 C TA≦25 OC Power rating(mW) TA=70 OC Power rating(mW) TA= 85 OC Power rating (mW) TA= 105 OC Power rating (mW) SOP-8 165 6.06 757 485 394 272 TO-92 156 6.41 801 513 417 288 SOT-89 71(note) 14.1 1763 1128 916 635 SOT-23 285 3.5 438 280 228 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. 158 Package O RECOMMENDED OPERATING CONDITIONS Min Max Operating free air temperature range, TA 0 105 Cathode current, IK 1 100 mA Cathode voltage, VKA 0 16 V 2004/08/27 Champion Microelectronic Corporation Units O C 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 Reference Input Voltage Symbol VREF Test Conditions CM431A Typ Max IK = 10mA, VKA = VREF ,0.5% 2.488 2.5 2.512 V IK = 10mA, VKA = VREF ,1.0% 2.475 2.5 2.525 V IK = 10mA, VKA = VREF ,1.5% 2.463 2.5 2.537 V 4 17 mV -1.4 -2.7 mV/V 4 µA IK = 10mA, VKA = VREF, 0OC ≤ TA ≤ 70 OC Reference Drift Voltage Ratio, Ref to Cathode IK = 10mA, VKA = 2.5V to 18V (note 4) Reference Input Current IREF Units Min IK = 10mA,VKA = VREF 2 IK = 10mA,VKA = VREF, 0OC ≤ TA ≤ 70 OC 2.3 Minimum Operating Current IMIN VKA = VREF 0.4 1 mA Off-State Cathode Current IOFF VKA = 18V, 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 2004/08/27 Ratio of change in reference input voltage to the change in cathode voltage Champion Microelectronic Corporation Page 5 CM431A 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 2004/08/27 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 2004/08/27 Champion Microelectronic Corporation Page 7 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR APPLICATION INFORMATION VBATT R* VO R1 0.1% VBATT CM431A VO CM431A VREF Von ≈ 2V Voff ≈ VBATT Input R2 0.1% Vth = 2.5V GND VO = (1 + R1/R2) × VREF Note: R should provide 1mA cathode current to the CM431A of minimum VBATT Figure 5. Single –Supply Comparator With Temperature compensated threshold. Figure 4. Shunt Regulator VBATT VO VBATT VO R1 R1 CM431A R2 CM431A R2 C VO = (1 + R1/R2) × VREF Figure 6. High-Current Shunt Regulator 2004/08/27 Champion Microelectronic Corporation Figure 7. Crowbar Circuit Page 8 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR APPLICATION INFORMATION (continued) VBATT VBATT VO = 5V/1.5A LM317 IO = VREF/RS Adjust 8.2KΩ 243Ω 0.1% CM431A CM431A 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 VO VBATT R1 IO R1 CM431A R2 CM431A IOUT = (VREF/RCL) + IKA VO = (1 + R1/R2) × VREF R1 = VBATT/((IO/hFE) + IKA) Min VO = VREF + 5V Figure 10. Output Control of a Three-Terminal Fixed Regulator 2004/08/27 Champion Microelectronic Corporation Figure 11. Precision Current Limiter Page 9 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR PACKAGE DIMENSION TO-92 θ A A1 b D A D1 E L e θ θ1 A1 L θ1 e D D1 b E SOT-23-3 D 3 b1 With Plating c c1 A A1 E E1 A2 b b Base Metal b1 c Section B-B c1 D E 1 E1 2 e b L e1 L1 e θ1 e1 θ θ1 θ A2 A θ2 θ2 A1 L 2004/08/27 See Section B-B Champion Microelectronic Corporation L1 Page 10 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR PACKAGE DIMENSION (CONTINUED) SOT-23-5 D 5 4 b1 With Plating c c1 A A1 E E1 A2 b b Base Metal b1 c Section B-B c1 D E 1 2 3 E1 e b L e1 L1 e θ1 e1 θ θ1 θ A2 A θ2 θ2 A1 L L1 See Section B-B SOT-89 D D1 L 5° H E φ1.0 C e e1 A 8° L b b1 C D D1 H E e1 b 2004/08/27 b1 b Champion Microelectronic Corporation e Page 11 CM431A LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR PACKAGE DIMENSION (CONTINUED) 8-PIN SOP (S08) PIN 1 ID θ θ 2004/08/27 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 2004/08/27 Tolerance Suffix 0.5% A 1% B 1.5% E 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 Sales & Marketing 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 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 2004/08/27 Champion Microelectronic Corporation Page 14