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| Precision Adjustable Shunt Reference CORPORATION CL2431 FEATURES DESCRIPTION The CL2431 is a three terminal adjustable voltage reference designed to act as an open-loop error amplifier with a 2.5V temperature compensated reference. Operating as a low temperature coefficient zener which is programmable from VREF to 18V with two external resistors while providing a wide operating current range of 1.0mA to 100mA with a typical dynamic impedance of 0.15. As a shunt regulator the device can be used as either a positive or negative voltage reference. Active output circuitry provides a very sharp turn-on characteristic, making the CL2431 an excellent replacement for low-voltage zener diodes in many applications, including on-board regulation and adjustable power supplies. ORDERING INFORMATION Part CL2431VS CL2431AVS CL2431IVS CL2431IAVS Package SOT-23 SOT-23 SOT-23 SOT-23 Tolerance 1.0% 0.5% 1.0% 0.5% Temperature Range 0 to +105oC 0 to +105oC -40 to +85oC -40 to +85oC * * * * * * * Temperature-Compensated: 30ppm/ C Trimmed 0.5% Bandgap Reference Internal Amplifier with 100mA Capability Temperature Range: Extended to 0 to 105oC Low Frequency Dynamic Output Impedance: < 150m Low Output Noise SOT-23 Replacement for TL431 o PIN CONFIGURATION (Top View) SOT-23 (VS) CATHODE ANODE REFERENCE 1J-22 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CL2431 CORPORATION ABSOLUTE MAXIMUM RATINGS SYMBOL VKA IAK IKA IREF PD PARAMETER Cathode-Anode Reverse Breakdown Anode-Cathode Forward Current Operating Cathode Current Reference Input Current Continuous Power Dissipation at 25 oC SOT-23 Junction Temperature Storage Temperature Lead Temperature, Soldering 10 Seconds RATING 18 1 100 1 UNITS V A mA mA 200 150 -65 to 150 300 mW o o o TJ TSTG TL C C C Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. RECOMMENDED CONDITIONS SYMBOL VKA IK PARAMETER Cathode Voltage Cathode Current RATING VREF to 18 10 UNIT V mA TYPICAL THERMAL RESISTANCES PACKAGE SOT-23 JA 575oC/W JC 150 oC/W TYPICAL DERATING 1.7mW/oC FUNCTIONAL BLOCK DIAGRAM CATHODE (K) REFERENCE (R) + - 2.5V ANODE (A) 1G-36 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CL2431 CORPORATION ELECTRICAL CHARACTERISTICS Electrical characteristics are guaranteed over full junction temperature range (0 to 105 oC). Ambient temperature must be derated based on power dissipation and package thermal characteristics. The conditions are: VKA = VREF and IK = 10mA unless otherwise stated. SYMBOL VREF TC VREF VK IREF IREF IK(MIN) IK(OFF) ZKA PARAMETER Reference Voltage VREF with Temp.* Ratio of Change in VREF to Cathode Voltage Reference Input Current IREF Temp Deviation Min I K for Regulation Off State Leakage Dynamic Output Impedance -2.7 -2 MIN 2.490 2.470 TYP 2.500 2.500 0.6 -1.01 -0.4 0.7 0.4 0.4 0.04 0.15 0.3 4 1.2 1 250 0.5 A A mA nA 2 2 1 3 1 VREF = 0V, VKA = 18V f 1kHz, IK = 1 to 100mA Over Temp. MAX 2.515 2.520 0.2 UNIT V V mV/ oC mV/V CIRCUIT 1 1 1 2 VREF to 10V 10V to 18V TEST CONDITION TA = 25oC, 0.5% CL2431A TA = 25 oC, 1.0% CL2431 *CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC) ppm mV 0 0 2000 0.2 TEST CIRCUITS V IN V KA = V REF I REF TEST CIRCUIT 1 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 % 0 -5 -10 T V REF * TC in mV/oC = VREF (mV) TA * TC in %/oC = 0 15 30 45 60 75 90 105 VREF o VREF at 25 C TA x 100 TEMPERATURE (C) 0.019 mV/C 0.001 %/C 7.6 ppm/C 1J-28 * TC in ppm/ C = o VREF o VREF at 25 C TA x 106 V IN V KA V IN V KA IK IK R1 (V REF ) R2 I REF I K(OFF) 1G-38 1G-39 1G-40 TEST CIRCUIT 2 TEST CIRCUIT 3 CL2431 CORPORATION TYPICAL PERFORMANCE CURVES 900 I K - CATHODE CURRENT (A) 800 700 600 500 400 300 200 100 0 -100 LOW CURRENT OPERATING CHARACTERISTICS VKA = VREF TEMPERATURE RANGE: -55 to 125C 150 I K - CATHODE CURRENT (mA) 125 100 75 50 25 0 -25 -50 -75 HIGH CURRENT OPERATING CHARACTERISTICS VKA = VREF TEMPERATURE RANGE: -55 to 125C 125C 25C -55C -200 -1.0 0 1.0 2.0 3.0 VKA - CATHODE VOLTAGE (V) 1G-41 -100 -2 -1 0 1 2 VKA - CATHODE VOLTAGE (V) 3 1G-42 100 I Z off - OFF STATE CATHODE CURRENT (nA) OFF STATE LEAKAGE VREF - REFERENCE VOLTAGE (V) VKA = 18V VREF = 0V 2.53 TEMPERATURE COEFFICIENT AS A FUNCTION OF TRIM VALUE VKA = VREF 2.52 I K = 10mA 2.51 2.50 2.49 2.48 2.47 2.46 2.45 0 30 60 90 120 -60 -30 TA - AMBIENT TEMPERATURE (C) VREF = 2.500V AT 25C 10 1 0.1 0.01 0 30 60 90 120 -60 -30 TA - AMBIENT TEMPERATURE (C) 1P-43 1J-29 3.0 I REF - REFERENCE INPUT CURRENT (A) REFERENCE INPUT CURRENT VREF - CHANGE IN REFERENCE VOLTAGE (mV) R1 = 10k R2 = 2.5 I K = 10mA 2.0 1.5 1.0 0.5 0 0 30 60 90 120 -60 -30 TA - AMBIENT TEMPERATURE (C) 0 REFERENCE VOLTAGE LINE REGULATION -10 -55C 0C -20 25C 75C 125C -30 -40 I K = 10mA -50 TEMPERATURE RANGE: -55 to 125C 0 1G-45 3 6 9 12 15 VKA - CATHODE VOLTAGE (V) 18 1J-30 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CL2431 CORPORATION TYPICAL PERFORMANCE CURVES (continued) 70 NOISE VOLTAGE nV/ Hz 60 50 40 30 20 NOISE VOLTAGE Z KA - DYNAMIC IMPEDANCE () 0.150 0.125 0.100 0.075 0.050 0.025 LOW FREQUENCY DYNAMIC OUTPUT IMPEDANCE VKA = VREF I KA = 1 TO 100mA f 1kHz VKA = VREF 10 I K = 10mA TA = 25C 0 100 1k 10k 10 f - FREQUENCY (Hz) 100k 1G-47 0.0 -60 -30 0 30 60 90 120 TA - FREE AIR TEMPERATURE 1G-48 100 Z KA - DYNAMIC IMPEDANCE () DYNAMIC OUTPUT IMPEDANCE TA = 25C I K = 1 TO 100mA 10 1.0 0.1 0.01 1k 10k 100k 1M f - FREQUENCY (Hz) 10M 1G-49 70 A V - SMALL SIGNAL VOLTAGE GAIN (dB) 60 SMALL SIGNAL VOLTAGE GAIN vs FREQUENCY TEMPERATURE RANGE: -55 to 125C OUT 15k IK 230 50 I K = 10mA 40 30 20 10 0 1k 9F 8.25k GND 1H-01 10k 100k 1M f - FREQUENCY (Hz) 10M 1J-31 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CL2431 CORPORATION TYPICAL PERFORMANCE CURVES (continued) INPUT AND OUTPUT VOLTAGES (V) 6 5 4 3 2 1 0 -1 PULSE RESPONSE INPUT INPUT MONITOR 220 OUT OUTPUT f P = 100kHz 50 GND 1H-03 0 1 2 3 4 5 6 7 8 9 10 11 12 t - TIME (s) 1H-02 100 I K - CATHODE CURRENT (mA) 90 80 70 60 50 40 30 20 10 STABILITY BOUNDARY CONDITIONS A: VKA = VREF B: VKA = 5V AT I K = 10mA C: VKA = 10V AT I K = 10mA D: VKA = 15V AT I K = 10mA 150 IK STABILITY REGION C 10k CL A B TA = 25C D 1H-05 0 100 101 102 103 104 105 106 107 C L - LOAD CAPACITANCE (pF) 1H-04 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 |
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