CL431 CALOGIC | Alldatasheet

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Technical content

FEATURES

  • • Trimmed 0.5% Bandgap Reference
  • • Nominal Temperature Range Extended to 105oC
  • • Temperature-Compensated: 30ppm/oC
  • • Internal Amplifier with 150mA Capability
  • • Low Output Noise
  • • Low Frequency Dynamic Output Impedance

DESCRIPTION

The CL431 is an adjustable shunt regulator designed to act as an open-loop error amplifier with a 2.5V temperature compensated reference. Its highly accurate 0.5% bandgap reference is perfect for applications requiring stability and accuracy over temperature and life. Sharp turn-on characteristics and a low temperature coefficient make the CL431 an excellent replacement for many zener diode applications, programmable to any value greater than 2.5V and up to 36V by using two external resistors. As a combination error amplifier and reference, it can be used to manage control loops such as switching power supplies. The CL431 can be used as a direct replacement for the standard TL431.

ORDERING INFORMATION

Part Package Temperature Range CL431LP TO-92 0 to 105 oC CL431D 8-Pin Plas tic SOIC 0 to 105 oC CL431S SOT-89 0 to 105 oC CORPORATION CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CATHODE ANODE REFERENCE TO-92 (LP) 1G-33 SOIC (D) REFERENCE ANODE ANODE N/C CATHODE ANODE ANODE N/C 1G-34 1G-35 CATHODE ANODE REFERENCE SOT-89 (S) PIN CONFIGURATION (Top View)

SYMBOL PARAMETER RATING UNITS VKA Cathode-Anode Reverse Breakdown 37 V IAK Anode-Cathode Forward Current 1 A IKA Operating Cathode Current 250 mA IREF Reference Input Current 10 mA PD Continuous Power at 25oC TO-92 8L SOIC SOT-89 775 750 1000 mW mW mW TJ Junction Temperature 150 oC TSTG Storage Temperature –65 to 150 oC TL Lead Temperature, Soldering 10 Seconds 300 oC Exceeding ABSOLUTE MAXIMUM RATINGS may cause permanent damage. Extended operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not recommended as it may adversely affect reliability and performance. RECOMMENDED CONDITIONS SYMBOL PARAMETER RATING UNIT VKA Cathode Voltage V REF to 20 V IK Cathode Current 10 mA TYPICAL THERMAL RESIST ANCE PACKAGE θJA θJC TYPICAL DERATING TO-92 160 oC/W 80 oC/W 6.3mW/ oC SOIC 175 oC/W 45 oC/W 5.7mW/ oC SOT-89 110 oC/W 8 oC/W 9.1mW/ oC CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 1G-36ANODE (A) CATHODE (K) 2.5V REFERENCE (R) + FUNCTIONAL BLOCK DIAGRAM CORPORATION

CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025

ELECTRICAL CHARACTERISTICS

Electrical Characteristics are guaranteed over full junction temperature range (0 to 105oC). 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 PARAMETER CL431 (0.5%) UNIT TEST CIRCUIT TEST CONDITION MIN TYP MAX VREF Reference Voltage 2.490 2.503 2.515 V 1 T A = 25oC 2.469 2.536 V 1 Over Temp. TC ΔVREF with Temp.* 0.07 0.20 mV/ oC1 ΔVREF Δ VK Ratio of Change in VREF to Cathode Voltage –2.7 –1.0 mV/V 2 VREF to 10V –2 –0.4 0.3 10V to 36V IREF Reference Input Current 0.7 4 µA2 ΔIREF IREF Temp Deviation 0.4 1.2 µA 2 Over Temp. IK(MIN) Min IK for Regulation 0.4 1 mA 1 IK(OFF) Off State Leakage 0.04 250 nA 3 V REF = 0V, VKA = 36V ZKA Dynamic Output Impedance 0.15 0.5 Ω 1f ≤ 1kHz, IK = 1 to 150mA 0 15 30 45 60 75 90 105 TEMPERATURE (˚C) 0.07 mV/˚C 0.003 %/˚C 27 ppm/˚C 0.55000 000 mV ppm –10 ΔV REF ΔT 1G-37

  • TC in mV/oC = ΔVREF (mV ) ΔTA
  • TC in %/oC = ΔVREF VREF at 25oC x 100 ΔTA
  • TC in ppm/oC = ΔVREF VREF at 25oC x 106 ΔTA *CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC) TEST CIRCUITS INV KAV KI 1G-38 REFI REF= V REFI INV KAV REF(V ) KI 1G-39 INV KAV K(OFF)I 1G-40 TEST CIRCUIT 1 TEST CIRCUIT 2 TEST CIRCUIT 3 CORPORATION

TYPICAL PERFORMANCE CURVES CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 100 0.01 –60 1G-43 OFF STATE LEAKAGE –30 0 3 06 09 0 1 2 0 0.1 CURRENT (nA) VKA = 36V VREF = 0V – AMBIENT TEMPERATURE (˚C)TA – OFF STATE CATHODEIZ off 150 –100 –2 3 1G-42 HIGH CURRENT OPERATING CHARACTERISTICS –25 –50 –75 125 100 210–1 – CATHODE VOLTAGE (V)VKA TEMPERATURE RANGE: –55 to 125˚C VKA = VREF – CATHODE CURRENT (mA)IK 2.54 2.46 –60 1G-44 TEMPERATURE COEFFICIENT AS A FUNCTION OF TRIM VALUE –30 2.47 2.48 2.49 2.50 2.51 2.52 2.53 0 30 60 90 120 VREF – REFERENCE VOLTAGE (V) – AMBIENT TEMPERATURETA VKA = VREF IK = 10mA VREF = 2.503V AT 25˚C VKA – CATHODE VOLTAGE (V) – CATHODE CURRENT ( µA)IK 900 –200 –1.0 3.0 1G-41 LOW CURRENT OPERATING CHARACTERISTICS 1.00 2.0 –100 800 700 600 500 400 300 200 100 125˚C –55˚C 25˚C V= V REFKA TEMPERATURE RANGE: –55 to 125˚C –50 03 0 1G-46 REFERENCE VOLTAGE LINE REGULATION 3 6 9 12 15 18 21 24 27 –10 –20 –30 –40 VOLTAGE (mV) – CHANGE IN REFERENCEVREF – CATHODE VOLTAGE (V)VKA IK = 10mA TEMPERATURE RANGE: –55 to 125˚C –55˚C 0˚C 25˚C 75˚C 125˚C 3.0 –60 1G-45 REFERENCE INPUT CURRENT –30 0 3 06 09 0 1 2 0 2.5 2.0 1.5 1.0 0.5 CURRENT ( µA) – REFERENCE INPUTIREF TA – AMBIENT TEMPERATURE (˚C) R1 = 10kΩ R2 = ∞ IK = 10mA CORPORATION

CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 TYPICAL PERFORMANCE CURVES (continued) 1G-47 NOISE VOLTAGE 100k f – FREQUENCY (Hz) 10k1k100 NOISE VOLTAGE nV/ Hz VKA = VREF = 10mA TA = 25˚C IK 0.150 0.0 –60 1G-48 LOW FREQUENCY DYNAMIC OUTPUT IMPEDANCE –30 0 3 06 09 0 1 2 0 0.125 0.100 0.075 0.050 0.025 – DYNAMIC IMPEDANCE ( Ω )Z KA VKA = VREF = 1 TO 100mA f ≤ 1kHz IKA – FREE AIR TEMPERATURETA 100 0.01 1G-49 DYNAMIC OUTPUT IMPEDANCE 10M f – FREQUENCY (Hz) 1M100k10k 1.0 0.1 – DYNAMIC IMPEDANCE ( Ω )ZKA TA = 25˚C = 1 TO 100mAIK 1G-50 SMALL SIGNAL GAIN vs FREQUENCY 10M f – FREQUENCY (Hz) 1M100k10k IK = 10mA GAIN (dB) – SMALL SIGNAL VOLTAGEA V TA = 25˚C 1H-01 KI 230Ω GND OUT 15k 8.25k 9µF

TA = 25˚C A C D – CATHODE CURRENT (mA)IK B A: VKA = VREF B: VKA = 5V AT IK = 10mA C: VKA = 10V AT IK = 10mA D: VKA = 15V AT IK = 10mA STABILITY REGION – LOAD CAPACITANCE (pF)C L 1H-02 PULSE RESPONSE t – TIME (µs) INPUT AND OUTPUT VOLTAGES (V) 12123456789 1 0 1 1 INPUT OUTPUT 1H-03 GND OUT 220ΩINPUT MONITOR 50Ω fP = 100kHz 1H-05 KI LC 150Ω 10k TYPICAL PERFORMANCE CURVES (continued) CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CORPORATION