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| AS431L Low Voltage Precision Adjustable Shunt Regulator FEATURES * Tight Tolerance.................................................. 0.5% @ 10mA * Wide Operating Range..................................... 1mA to 100mA * Low Extended Temperature Range ....................0C to 105C * Low Temperature Coefficient .................................30 ppm/C * Offered in TO-92, SOT-89, SOT-23-3 and SO-8 * Improved replacement in performance of AS431 & TL431 * Low Cost Solution APPLICATIONS * Battery Operating Equipment * Adjustable Supplies * Switching Power Supplies * Error Amplifiers * Single Supply Amplifier * Monitors/ VCR/ TV * Personal Computers PRODUCT DESCRIPTION The AS431L is a 3-terminal Adjustable Shunt Voltage Regulator providing a highly accurate bandgap reference. AS431L acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The AS431L thermal stability, wide operating current (100mA) and temperature range (0C to 105C) makes it suitable for all variety of applications that are looking for a low cost solution with high performance. The output voltage may be adjusted to any value between VREF and 20V with 2 external resistors. The AS431L is operating in full industrial temperature range of 0C to 105C. The AS431L is available in TO-92, SOT-89, SOT-23-3 and SO-8 packages. ORDERING INFORMATION Part Number AS431LXN AS431LXM1 AS431LXS AS431LXM Temperature Range 0C to 105C 0C to 105C 0C to 105C 0C to 105C Package Type TO-92 SOT-89 SO-8 SOT-23-3 PIN CONNECTIONS 8-Pin Surface Mount (S) TO-92 (N) 1 2 3 CATHODE ANODE ANODE 1 2 3 4 8 7 REF ANODE ANODE N/C REF X= Tolerance (A = 0.5%; Blank = 1%; C = 2%) AS431 6 5 CATHODE (K) N/C ANODE CATHODE Bottom View Top View REFERENCE (R) + SOT-23-3 (M) ANODE SOT-89 (M1) - 1 2.5V AS431 2 N/C 3 CATHODE 1 REF AS431 2 3 CATHODE ANODE (A) ANODE Top View Top View Rev. 10/5/00 AS431L ABSOLUTE MAXIMUM RATINGS Parameter Cathode-Anode Reverse Breakdown Anode-Cathode Forward Current Operating Cathode Current Reference Input Current Continuous Power Dissipation at 25C TO-92 SOT-23 SOIC-8 SOT-89 Junction Temperature Storage Temperature Lead Temperature (Soldering 10 sec.) Symbol VKA IAK IKA IREF PD Rating 30 1 150 10 775 200 750 1000 150 -65 to +150 300 Units V A mA mA mW mW mW mW C C C TJ TSTG TL 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 Parameter Cathode Voltage Cathode Current Symbol VKA IK Rating VREF to 20 10 Unit V mA TYPICAL THERMAL RESISTANCE Package Type TO-92 SOT-23 SOIC-8 SOT-89 JA 160C/W 575C/W 175C/W 110C/W JC 80C/W 150C/W 45C/W 8C/W Typical Derating 6.3 mW/C 1.7 mW/C 5.7 mW/C 9.1 mW/C ELECTRICAL CHARACTERISTICS at 25C Ik @ 10mA Vk=Vref , unless otherwise specified. Parameter Reference Voltage Ratio of Change in VREF to Cathode Voltage Reference Input Current IREF Temp Deviation Min IK for Regulation Off State Leakage Dynamic Output Impedance TC = Test Circuit Symbol VREF VREF VK IREF IREF IK(MIN) IK(OFF) ZKA Test Conditions TA = 25C TC = 1 VREF to 10V 10V to 20V TC = 2 TC = 2 Over Temp. TC = 2 TC = 1 VREF = 0V, VKA = 20V TC = 3 TC = 1 AS431LA Min Typ 2.490 2.503 -2.7 -2 -1.0 -0.4 0.7 0.4 0.4 0.04 0.15 Max 2.515 Min 2.470 -2.7 -2 AS431L Typ 2.495 -1.0 -0.4 0.7 0.4 0.4 0.04 0.15 Max 2.520 Min 2.445 -2.7 -2 AS431LC Typ Max 2.495 2.545 -1.0 -0.4 0.7 0.4 0.4 0.04 0.15 Unit V mV/V 0.3 4 1.2 1 1 0.5 0.3 4 1.2 1 1 0.5 0.3 4 1.2 1 1 0.5 A A mA A Rev. 10/5/00 AS431L *CALCULATING AVERAGE TEMPERATURE COEFFICEINT (TC) ppm 0 0 0 VREF T mV % TC in mV/C = VREF (mV) TA -10 5000 0.5 TC in mV/C = ( VREF VREF at 25C TA ) x 100 0 15 30 45 60 75 90 105 TC in ppm/C = ( VREF VREF at 25C TA ) x 106 0.07 mV/C 0.003 %/C 27 ppm/C TEST CIRCUITS VIN VKA = VREF VIN VKA VIN VKA IREF IK R 1 IK IREF IK (OFF) (VREF) R 2 1G-38 1G-39 1G-40 TEST CIRCUIT 1 TEST CIRCUIT 2 TEST CIRCUIT 3 Rev. 10/5/00 AS431L TYPICAL PERFORMANCE CURVES Low Current Operating Characteristics 900 800 700 VKA = VREF Temperature Range: - 0C to 105 C 150 125 100 VKA = VREF Temperature Range: - 0C to 105 C High Current Operating Characteristics IK - Cathode Current (A) 500 400 300 200 -0 C 100 0 -100 -200 -1.0 0 1.0 2.0 3.0 105 C 25 C IK - Cathode Current (mA) 600 75 50 25 0 -25 -50 -75 -100 -2 -1 0 1 2 3 VKA - Cathode Voltage (V) VKA - Cathode Voltage (V) Figure 3 Figure 2 Off State Leakage 100 VKA = 36V VREF = 0V 2.53 VKA = VREF IK = 10 mA Reference Voltage vs. Ambient Temperature 2.52 IZ off - Off State Cathode Current (nA) 10 2.51 VREF - Reference Voltage (V) 2.50 VREF = 2.500 V at 25 C 2.49 1 2.48 0.1 2.47 2.46 0.01 -60 -30 0 30 60 90 120 2.45 -60 -30 0 30 60 90 120 TA - Ambient Temperature ( C) TA - Ambient Temperature ( C) Figure 4 Figure 5 Rev. 10/5/00 AS431L TYPICAL PERFORMANCE CURVES Reference Input Current 3.0 R1 = 10 k R2 = IK = 10 mA 2.5 -10 0 Reference Voltage Line Regulation ( IREF - Reference Input Current A) VKA - Cathode Voltage (V) 0 C -20 25 C 75 C -30 105 C -40 2.0 1.5 1.0 0.5 -50 0 3 6 9 12 15 18 21 24 27 30 VKA - Cathode Voltage (V) 0 -60 -30 0 30 60 90 120 Figure 7 TA - Ambient Temperature ( C) Figure 6 Noise Voltage 70 0.150 Low Frequency Dynamic Output Impedance VKA = VREF IKA = 1 to 100 mA f < 1 kHz 60 0.125 50 ZKA - Dynamic Impedance () 0.100 Noise Voltage nV/Hz 40 0.075 30 0.050 20 0.025 10 0.0 -60 -30 0 30 60 90 120 TA - Free Air Temperature 0 10 100 1k 10 k 100 k Figure 9 f - Frequency (Hz) Figure 8 Rev. 10/5/00 AS431L TYPICAL PERFORMANCE CURVES Dynamic Output Impedance 100 TA = 25 C IK = 1 to 100 mA 10 ZKA - Dynamic Impedance () 1.0 0.1 0.01 1k 10 k 100 k 1M 10 M f - Frequency (Hz) Figure 10 Small Signal Voltage Gain vs. Frequency 70 Temperature Range: -0C to 105 C 60 IK = 10 mA AV - Small Signal Voltage Gain (dB) 50 OUT 40 9 F 30 230 15 k IK 20 8.25 k GND 10 0 1k 10 k 100 k 1M 10 M f - Frequency (Hz) Figure 11 Rev. 10/5/00 AS431L TYPICAL PERFORMANCE CURVES Pulse Response 6 5 INPUT INPUT MONITOR 220 OUT 4 Input and Output Voltages (V) 3 OUTPUT 50 fP = 100 kHz 2 1 GND 0 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 t - Time (s) Figure 12 Stability Boundary Conditions 100 A: B: C: D: VKA VKA VKA VKA = VREF = 5V at IK = 10 mA = 10V at IK = 10 mA = 15V at IK = 10 mA 90 80 70 C 150 IK - Cathode Current (mA) 60 IK 50 40 STABILITY REGION 30 CL 20 A B D 10 k 10 TA = 25 C 0 10 0 10 1 10 2 10 3 10 4 10 5 10 6 10 7 CL - Load Capacitance (pF) Figure 13 Rev. 10/5/00 |
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