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5 ! ic adjustable precision shunt regulators
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?e? ! ! fh431 1 description & features c the fh431 series ics are three-terminal adjustable shunt regulators with guaranteed thermal stability over a full operation range. these ics feature sharp turn-on characteristics, low temperature coefficient and low output impedance, which make them ideal substitutes for zener diodes in applications such as switching power supply, charger and other adjustable regulators. the fh431 precision reference is offered in three band gap tolerance: 0.5%,1.0% and 1.5 . fh431 ??{????S ?@??{?S ?Ow_P?{ fh431 ?N? 0.5% 1.0% 1.5 adjustable output voltage from v ref to 36v low dynamic output resistance: 200m ? typical sink current capacity from 1ma to 100 ma low output noise typical equivalent full range temperature coefficient of 30ppm/c {? 2.5v 36v ??B? 200m ? ? 1.0 100ma ?s? ???S 30ppm/c ? applications pc motherboard voltage monitor voltage reference pwm down converter with reference charger X ?O ?? _P?? 123 cathode nc nc (note 2) (note 1) pin configuration ? ref anode cathode anode sot-23 vref tolerance 3 2 ref 1 anode week no. vref tolerance 3 cathode 1 ref 2 m anode week no. 54 w 2 13 r vref tolerance ref sot-25 sot-89 week no. cathode k ordering information for 40v products ??Y? package b temperature range ?? voltage tolerance part number a?? marking id packing type b 0.5% fh431kt36-a k1 tape 1.0% fh431kt36-b k2 tape sot-23 1.5% fh431kt36-c k3 tape 0.5% fh431mt36-a m1 tape 1.0% fh431mt36-b m2 tape sot-23 1.5% fh431mt36-c m3 tape 0.5% fh431wt36-a w1 tape 1.0% fh431wt36-b w2 tape sot-25 1.5% fh431wt36-c w3 tape 0.5% fh431rt36-a r1 tape 1.0% fh431rt36-b r2 tape sot-89 -40 c ~ 85 c 1.5% fh431rt36-c r3 tape note: 1. for fh431ktxx , 2. for fh431mtxx.
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5 ! ic adjustable precision shunt regulators
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?e? ! ! fh431 2 ordering information for 20v products ??Y? package b temperature range ?? voltage tolerance part number a?? marking id packing type b 0.5% FH431KT18-A k4 tape 1.0% fh431kt18-b k5 tape sot-23 1.5% fh431kt18-c k6 tape 0.5% fh431mt18-a m4 tape 1.0% fh431mt18-b m5 tape sot-23 1.5% fh431mt18-c m6 tape 0.5% fh431wt18-a w4 tape 1.0% fh431wt18-b w5 tape sot-25 1.5% fh431wt18-c w6 tape 0.5% fh431rt18-a r4 tape 1.0% fh431rt18-b r5 tape sot-89 -40 c ~ 85 c 1.5% fh431rt18-c r6 tape note: 1. for fh431ktxx , 2. for fh431mtxx. fh431 x x x x a: 0.5% b: 1.0% c: 1.5% type a?? 18: 18v 36: 36v packing type b? t tape b: bulk ?b package b k: sot-23 O m: sot-23 w: sot-25 r: sot-89 typical application ?? block diagram ?D
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5 ! ic adjustable precision shunt regulators
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?e? ! ! fh431 3 maximum ratings (t a =25 ) ~? (note 1) rating ~? characteristic ? symbol ? min max unit fh431 40v 40 cathode voltage (note 2) ?O? v ka -0.3 fh431 20v 20 v continuous cathode current ?OBm i k -100 150 ma reference input current range ? i ref -0.05 10 ma sot-23-3/5l 370 power dissipation ? p d sot-89-3 770 mw junction temperature Y t j 0 150 c sot-23-3 330 sot-23-5 250 thermal impedance (note 3) ja sot-89-3 100 c / w storage temperature range ? t stg -65 150 c note 1: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into, negative out of the specified terminal. note 2: voltage values are with respect to the anode terminal unless otherwise noted. note 3: ja: thermal resistance-j unction to ambient, d f = 1/ j a junction temperature calculation: t j = t a + (p d j a ). the ja numbers are guidelines for the thermal per formance of the device/pc-board system. all of the above assume no ambient airflow. recommended operating conditions ]?l symbol ? min max unit operating free air temperature range ??? t a 0 70 c cathode current ?O i k 1 100 ma fh431 40v 36 cathode voltage ?O? v ka 0 fh431 20v 18 v
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5 ! ic adjustable precision shunt regulators
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?e? ! ! fh431 4 electrical characteristics t a =25 unless otherwise noted of?? 25c parameter symbol ? test conditions y?l min. ? typ. ? max. ? unit i k =10ma, v ka =v ref , note 1 2.487 2.500 2.513 i k =10ma, v ka =v ref , note 2 2.475 2.500 2.525 reference input voltage ?? v ref i k =10ma, v ka =v ref , note 3 2.462 2.500 2.538 v reference drift ?? ? v ref i k =10ma, v ka =v ref , 0c t a 70c 4 17 mv ik =10ma, v ka =2.5v to 10v -1.4 -2.7 voltage ratio, ref to cathode ?O??? ? v ref ? v ka i k =10ma, v ka =10v to 36v -1.0 -2.0 mv/v i k =10ma, v ka =v ref 2.3 reference input current ? i ref i k =10ma, v ka =v ref , 0c t a 70c 2 4 a minimum operating current i min v ka =v ref 0.4 1 ma off-state cathode current P?O i off v ka = 36v, v ref = 0v 0.1 1 a dynamic impedance ?B |z ka | v ka = v ref , i k = 1ma to 100ma, f 1khz 0.2 0.5 ? note 1: for fh431a only. the output accuracy is 0.5%. note 2: for fh431b only. the output accuracy is 1.0%. note 3: for fh431c only. the output accuracy is 1.5%. note 4: ? v ref / ? v ka ratio of change in reference input voltage to the change in cathode voltage. parameter measurement information y?D
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