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| Voltage Regulators AN1431T, AN1431M Variable output shunt regulator I Overview The AN1431T and AN1431M are highly accurate stabilized power supplies in which the output voltage can be adjusted in the range from approximately 2.5 to 36V under the operating temperature by using the external resistor. Because of its fast rising characteristic, it can be used as a Zener diode and has the wide application. AN1431T 5.00.2 Unit: mm 4.00.2 (1.0) 5.10.2 2.30.2 0.60.15 (1.0) 13.50.5 I Features * High precision reference voltage: 2.5V (allowance: 2%) * High temperature stability: 17ppm/C typ. * Output voltage externally adjustable: 2.5 to 36V * Fast rising output * Low input impedance: 0.2 typ. * Low output noise voltage 2.54 0.43+0.1 -0.05 0.43+0.1 -0.05 231 SSIP003-P-0000 AN1431M 4.6 max. 1.8 max. Unit: mm 1.6 max. I Block Diagram (AN1431T) 4.25 max. 0.44 max. Current Source Output Tr Error Amp. + - VKA = VREF (1 + Voltage Reference R2 = 2.5k R1 ) + IREF * R1 R2 0.48 max. 1.5 3.0 0.58 max. 1 (3) IK 3 (2) 2 (1) IREF VKA VREF 1 2 3 V1 R1 R2 HSIP003-P-0000B Note) The number in ( ) shows the pin number for the AN1431M. I Pin Descriptions * AN1431T Pin No. 1 2 3 Cathode Reference pin Anode Description * AN1431M Pin No. 1 2 3 Anode Cathode Description Reference pin 0.8 min. 2.6 max. 2.6 45 Publication date: August 2001 SFF00001AEB 1 AN1431T, AN1431M I Absolute Maximum Ratings at Ta = 25C Parameter Supply voltage Supply current Power dissipation Reference input current Operating ambient temperature Storage temperature * AN1431T AN1431M AN1431T AN1431M Symbol VCC ICC PD IREF Topr Tstg Rating 37 -100 to +150 650 * - 0.05 to +10 -20 to +85 -25 to +80 -55 to +150 -55 to +125 Unit V mA mW mA C C AN1431M is mounted on a standard board (glass epoxy: 20mm x 20mm x t1.7mm with Cu foil of 1cm2 or more). g g I RecommendedpOperating Range at Ta = 25C Parameter Supply voltage Symbol VKA Range VREF (2.5 to 36V) I Electrical Characteristics at Ta = 25C Parameter Reference voltage Symbol VREF Conditions VKA = VREF, IK = 10mA VKA = VREF, IK = 10mA, Ta = 0 to +70C IK = 10mA, VKA = 10V to VREF IK = 10mA, VKA = 36V to 10V IK = 10mA, R1 = 10k, R2 = IK = 10mA, R1 = 10k, R2 = , Ta = 0 to +70C VKA = VREF VKA = 36V, VREF = 0V VKA = VREF, IK = 1 to 100mA, f 1kHz IREF IREF(max) IREF(dev) = IREF(max) - IREF(min) Min 2.45 Typ 2.50 3 -1.2 -1 2 0.4 0.4 0.1 0.2 Max 2.55 17 -2.7 -2 4 1.2 1.0 1.0 0.5 Unit V mV mV/V mV/V A A mA A Reference voltage change to temperature VREF(Jev) *1, 2 Reference voltage power supply characteristic Reference input current Reference input current change to temperature Minimum cathode current Off-state cathode current Dynamic impedance VREF VKA IREF IREF(dev) Imin IOFF ZKA *3 *2 *1 VREF VREF(max) VREF(dev) = VREF(max) - VREF(min) VREF(dev) VREF(min) Ta IREF(min) Ta IREF(dev) The temperature coefficient aVREF for the reference input voltage is equivalently given by the following expression. VREF(dev) aVREF = VREF x 106 (ppm/C) VREF at Ta = 25C Ta For example, assuming VREF(max) = 2500mV (Ta = 30C), VREF(min) = 2497mV (Ta = 0C), (VREF(dev) = 3mV) and VREF = 2499mV (Ta = 25C) Ta = 70C 3mV then, aVREF = 2499mV x 106 = 17.1 (ppm/C) 70C *2 These values are design reference values, not guaranteed ones. *3 The dynamic impedance is defined by the following expression. ZKA = VKA IK The total dynamic impedance at VREF , VKA , IREF and IREF(dev) is as follows. V R Z = = ZKA (1 + 1 ) I R2 SFF00001AEB 2 AN1431T, AN1431M I Main Characteristics PD Ta 1000 (1) AN1431T Rth(j-a) = 190C/W (max.) (2) AN1431M Mounted on a standard board 800 (glass epoxy: 20mm x 20mm x t1.7mm with Cu foil of 1cm2 or more) 700 900 600 500 (1) 400 (2) 300 200 100 0 0 20 40 60 80 100 120 140 160 2700 2650 2600 2550 2500 2450 2400 2350 -50 -25 VREF Ta Reference input current IREF (A) VK = VREF IK = 10mA 4 IREF Ta IK = 10mA R1 = 10k R2 = 3 Reference voltage VREF (mV) Power dissipation PD (mW) 2 1 0 25 50 75 100 125 -40 -20 0 20 40 60 80 100 Ambient temperature Ta (C) Ambient temperature Ta (C) Ambient temperature Ta (C) I Application Circuit Examples 1. Shunt regulator +V VO 2. Constant current power supply +V IO 3. Constant current source +V R1 VREF R2 K K AN1431T/M AN1431T/M A A VREF RS K AN1431T/M A VREF RS VO = 1 + R1 V R2 REF IO = VREF RS IO = VREF RS IO 4. Current bootstrap +V VO 5. Adjustable output regulator combined with 3-pin regulator +V VO AN7805 R1 K CI VREF R2 R1 K AN1431T/M A VREF CO AN1431T/M A R2 VO = 1 + R1 V R2 REF VO = VREF 1 + R1 , VO(min) = VREF + 5V R2 SFF00001AEB 3 |
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