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| 2.5 V Precision Reference / Amplifier Features Description A/AS535 * * * * * * Temperature-compensated: 50 ppm/C Trimmed 0.5% typical bandgap reference High gain Internal amplifier with 100 mA capability Nominal temperature range extended to 105 C Low frequency dynamic output impedance: < 150 m Low output noise Top view The AS535 is a three terminal adjustable shunt regulator utilizing an accurate 2.5V bandgap reference. The AS535 is functionally similar to an AS2431 except that the reference and amplifier operate off of a seperate supply from the output, allowing very low output voltges (0.1V Typically) Because of its robust bipolar technology, the AS535 handles a wide range of current, and holds off up to 18V so its use is not limited to low power, low voltage systems. Significant care has been taken to provide adequate AC bandwidth to allow the AS535 as an amplifier in control systems and power electronics. ASTEC also offers a 1.0% version of this part, the A535. Pin Configuration -- SOIC (D) 4L SIP (SIP) SOT-23-5 (DBV) VCC N/C N/C ANODE VOUT N/C N/C ANODE VREF N/C VCC VOUT VREF ANODE VREF VCC VOUT Ordering Information Description Temperature Range 0.5% Order Codes 1.0% 8-Pin Plastic SOIC 4-Pin Plastic SIP SOT - 23 - 5 0 to 105 C 0 to 105 C 0 to 105 C AS535D AS535SIP AS535DBV A535D A535SIP A535DBV (c) ASTEC Semiconductor 25 A/AS535 Functional Block Diagram 2.5 V Precision Reference / Amplifier Supply (Vcc) Output (VOUT) Reference (R) 2.5 V Absolute Maximum Ratings Parameter Anode (A) Symbol Rating Units Supply Voltage Output Voltage Anode-VOUT Forward Current Operating Output Current Reference Input Current Continuous Power at 25 C 8L SOIC 4L SIP SOT-23-5 Junction Temperature Storage Temperature Lead Temperature (Soldering 10 sec.) VCC VOUT IAO IOUT IREF PD 18 18 1 100 1 V V A mA mA 750 1000 200 TJ TSTG TL 150 - 65 to 150 300 mW mW mW 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 Parameter Symbol Rating Unit Typical Thermal Resistances Package JA JC Typical Derating Output Voltage Output Current VOUT IOUT -0.2 to 18 10 V mA SOIC SIP SOT-23-5 175 C/W 95 C/W 575 C/W 45 C/W 50 C/W 150 C/W 5.7 mW/C 10.5 mW/C 1.7 mW/C ASTEC Semiconductor 26 2.5V Precision Reference / Amplifier Electrical Characteristics A/AS535 Electrical characteristics are guaranteed over the full junction temperature range (0-105 C). Ambient temperature must be derated based upon power dissipation and package thermal characteristics. Unless otherwise stated, test conditions are: VOUT= VREF, VCC=5V and IOUT= 1 mA. A535 (1.0 %) AS535 (0.5 %) Parameter Supply Voltage Supply Current Reference Voltage Line Regulation Load Regulation Temperature Deviation Reference Input Current Amplifier open loop gain Amplifier Unity gain frequency Output Saturation Voltage Off State Leakage Symbol VCC ICC VREF VOUT VOUT VOUT IREF Av F1 VSAT ILEAK Test Condition Min 4 Typ Max 15 Min 4 Typ Max Units 15 V mA V mV mV mV A dB MhZ 0.4 V nA 0.5 TJ = 25 C VCC =4 to 15 V IOUT = 1 to 100 mA 0 < TJ < 105 C 1 0. 5 1 2.475 2.500 2.525 -1 1 3 0.1 70 80 2 0.4 0.04 500 -10 50 10 0.4 2.488 2.500 2.513 -1 1 3 0.1 70 1 80 2 -10 50 8 0.4 CLOAD < 1nF IOUT =100mA VREF = 0 V, VOUT = 15 V 1 0.04 500 *Temperature deviation is defined as the maximum deviation of the reference over the given temperature range and does not imply an incremental deviation at any given temperature. Typical Performance Curves *Calculating Average Temperature Coefficient (TC) ppm mV 0 0 0 VREF T * TC in mV/C = VREF TA % (mV) 2000 0.2 -5 * TC in %/C = -10 0 15 30 45 60 Temperature (C) 75 90 105 ( VREF VREF at 25 C TA ) x 100 0.021 mV/C 0.008 %/C 8.0 ppm/C * TC in ppm/C = ( VREF VREF at 25 C TA ) x 106 ASTEC Semiconductor 27 |
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