Precision Adjustable Shunt Reference CORPORATION CL2431 FEATURES • • • • • • • o 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: < 150mΩ Low Output Noise SOT-23 Replacement for TL431 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 0.15Ω. 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 Package CL2431VS CL2431AVS CL2431IVS CL2431IAVS SOT-23 SOT-23 SOT-23 SOT-23 Tolerance Temperature Range 1.0% 0.5% 1.0% 0.5% 0 to +105oC 0 to +105oC -40 to +85oC -40 to +85oC 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 PARAMETER RATING UNITS VKA Cathode-Anode Reverse Breakdown 18 V IAK Anode-Cathode Forward Current 1 A IKA Operating Cathode Current 100 mA IREF Reference Input Current 1 mA PD Continuous Power Dissipation at 25 oC SOT-23 200 mW TJ Junction Temperature 150 o C TSTG Storage Temperature –65 to 150 o C TL Lead Temperature, Soldering 10 Seconds 300 o 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 TYPICAL THERMAL RESISTANCES PARAMETER RATING UNIT VKA Cathode Voltage VREF to 18 V IK Cathode Current 10 mA PACKAGE SOT-23 θJA θJC TYPICAL DERATING 575oC/W 150 oC/W 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 PARAMETER Reference Voltage MIN TYP MAX UNIT CIRCUIT 2.490 2.500 2.515 V 1 TA = 25oC, 0.5% CL2431A 2.470 2.500 2.520 V 1 TA = 25 oC, 1.0% CL2431 0.6 0.2 mV/ oC 1 mV/V 2 ∆VREF with Temp.* ∆VREF ∆VK Ratio of Change in VREF to Cathode Voltage –2.7 –1.01 –2 –0.4 TEST CONDITION VREF to 10V 0.3 10V to 18V IREF Reference Input Current 0.7 4 µA 2 ∆IREF IREF Temp Deviation 0.4 1.2 µA 2 Over Temp. IK(MIN) Min I K for Regulation 0.4 1 mA 1 IK(OFF) Off State Leakage 0.04 250 nA 3 VREF = 0V, VKA = 18V ZKA Dynamic Output Impedance 0.15 0.5 Ω 1 f ≤ 1kHz, IK = 1 to 100mA % 0 mV ppm *CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC) 0 ∆V REF ∆T 2000 0.2 • TC in mV/oC = 0 –5 • TC in %/oC = ∆VREF (mV) ∆TA ∆VREF o VREF at 25 C x 100 ∆TA –10 0 15 30 45 60 75 90 105 TEMPERATURE (˚C) o • TC in ppm/ C = 0.019 mV/˚C ∆VREF o VREF at 25 C x 106 ∆TA 0.001 %/˚C 7.6 ppm/˚C 1J-28 TEST CIRCUITS V IN V KA = V REF V IN V KA IK IK I REF R1 V IN V KA I K(OFF) I REF (V REF ) R2 1G-38 1G-39 TEST CIRCUIT 1 TEST CIRCUIT 2 1G-40 TEST CIRCUIT 3 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CL2431 CORPORATION TYPICAL PERFORMANCE CURVES TEMPERATURE RANGE: –55 to 125˚C 700 600 500 400 125˚C 300 25˚C 200 –55˚C 100 0 –100 –200 –1.0 0 1.0 2.0 3.0 VKA – CATHODE VOLTAGE (V) 1G-41 10 1 0.1 75 50 25 0 –25 –50 –75 –1 0 1 2 VKA – CATHODE VOLTAGE (V) 3 1G-42 VKA = VREF 2.52 I K = 10mA 2.51 2.50 VREF = 2.500V AT 25˚C 2.49 2.48 2.47 2.46 2.45 0 30 60 90 120 –60 –30 TA – AMBIENT TEMPERATURE (˚C) 1P-43 REFERENCE INPUT CURRENT 2.0 1.5 1.0 0.5 –10 –55˚C 0˚C –20 25˚C 75˚C –30 125˚C –40 I K = 10mA –50 TEMPERATURE RANGE: –55 to 125˚C 0 1G-45 1J-29 REFERENCE VOLTAGE LINE REGULATION 0 R1 = 10kΩ R2 = ∞ 2.5 I K = 10mA 0 0 30 60 90 120 –60 –30 TA – AMBIENT TEMPERATURE (˚C) 100 2.53 VKA = 18V VREF = 0V 3.0 VKA = VREF TEMPERATURE RANGE: –55 to 125˚C TEMPERATURE COEFFICIENT AS A FUNCTION OF TRIM VALUE OFF STATE LEAKAGE 0.01 0 30 60 90 120 –60 –30 TA – AMBIENT TEMPERATURE (˚C) 125 HIGH CURRENT OPERATING CHARACTERISTICS –100 –2 VREF – REFERENCE VOLTAGE (V) I Z off – OFF STATE CATHODE CURRENT (nA) 100 I REF – REFERENCE INPUT CURRENT (µA) 150 VKA = VREF I K – CATHODE CURRENT (mA) 800 VREF – CHANGE IN REFERENCE VOLTAGE (mV) I K – CATHODE CURRENT (µA) 900 LOW CURRENT OPERATING CHARACTERISTICS 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) NOISE VOLTAGE 0.150 Z KA – DYNAMIC IMPEDANCE (Ω) NOISE VOLTAGE nV/ Hz 70 60 50 40 30 20 VKA = VREF 10 I K = 10mA TA = 25˚C 0 100 1k 10k 10 f – FREQUENCY (Hz) Z KA – DYNAMIC IMPEDANCE (Ω) 0.125 VKA = VREF I KA = 1 TO 100mA f ≤ 1kHz 0.100 0.075 0.050 0.025 0.0 –60 100k 1G-47 100 LOW FREQUENCY DYNAMIC OUTPUT IMPEDANCE –30 0 30 60 90 120 TA – FREE AIR TEMPERATURE 1G-48 DYNAMIC OUTPUT IMPEDANCE TA = 25˚C I K = 1 TO 100mA 10 1.0 0.1 0.01 1k 10k 100k 1M f – FREQUENCY (Hz) 10M 1G-49 SMALL SIGNAL VOLTAGE GAIN vs FREQUENCY A V – SMALL SIGNAL VOLTAGE GAIN (dB) 70 TEMPERATURE RANGE: –55 to 125˚C OUT 60 15k 50 9µF IK 230Ω I K = 10mA 40 30 8.25k GND 20 1H-01 10 0 1k 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 INPUT AND OUTPUT VOLTAGES (V) TYPICAL PERFORMANCE CURVES (continued) 6 PULSE RESPONSE INPUT INPUT MONITOR 5 220Ω OUT 4 3 OUTPUT 50Ω f P = 100kHz 2 1 GND 0 1H-03 –1 0 1 2 3 4 5 6 7 8 9 10 11 12 t – TIME (µs) 1H-02 I K – CATHODE CURRENT (mA) 100 90 80 STABILITY BOUNDARY CONDITIONS A: VKA = VREF 150 Ω B: VKA = 5V AT I K = 10mA C: VKA = 10V AT I K = 10mA D: VKA = 15V AT I K = 10mA IK 70 60 50 STABILITY REGION C 40 10k 30 A 20 10 CL B TA = 25˚C 1H-05 D 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