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a s431i document number: ds 36816 rev. 2 - 2 1 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated low cathode current adjustable precision shunt regulator description the AS431I is a three - terminal adjustable shunt reg ulator with guaranteed thermal stability over a full operation range. it f eatures sharp turn - on characteris tics, low temperature coefficient and low output imped ance, which make it ideal substitute for zener diode in applications such as switching power supply, charger and other adjustable regulators. the output voltage of a s431i can be set to any value between v ref (2.5v) and the corresponding maximum cathode voltage (36v). the AS431I is offered in two grade initial voltage tolerance at + 25 o c , 0.5%, and 1%. this ic is available in 3 packages: to - 92 (bulk or ammo packing), sot - 23 and sot - 89. features ? programmable precise output voltage from 2.5v to 36v ? high stability under capacitive load ? low minimum cathode current for regulation: 10 a (typ.), 50 a (max.) ? low temperature deviation: 4.5mv typical ? sink current capacity from 50 a to 100ma ? low output noise ? wide opera ting range : - 40 to + 125 o c applications ? charger ? voltage adapter ? switching power supply ? graphic card ? precision voltage reference pin assignments (top view) (top view) (top view) (sot - 23/ n package) (sot - 89 (option 1/ r package) (sot - 89 (option 2/ r package) 1 2 3 ref anode cathode cathode anode ref 3 2 1 1 2 3 ref anode cathode
a s431i document number: ds 36816 rev. 2 - 2 2 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated pin assignments (cont.) (top view) (top view) (to - 92 (bulk packing) / z package) (to - 92 (ammo packing) / z package) typical applications circuit shunt regulator high current shunt regulator v out =(1+r1/r2)*v ref v out =(1+r 2 /r 3 )*v ref cathode anode ref 1 2 3 1 2 3 cathode anode ref
a s431i document number: ds 36816 rev. 2 - 2 3 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated typical applications circuit (cont.) current source or current limit precision 5v 1a regulator pwm converter with reference i out =v ref / r 2+ i ka
a s431i document number: ds 36816 rev. 2 - 2 4 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated functional block diagram absolute maximum ratings ( note 1 ) symbol parameter rating unit v ka cathode voltage 4 0 v i ka cathode current range (continuous) - 100 to 1 5 0 ma i ref reference input current range 10 ma p d power dissipation to - 92 770 mw sot - 89 770 sot - 23 370 t j junction temperature + 150 oc t stg storage temperature range - 65 to + 150 oc esd esd (human body model) 2000 v note 1 : stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. these are stres s ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended o perating conditions is not implied. exposure to absolute maximum ratings for extended periods may affect device reliability. recommended operating conditions symbol parameter min max unit v ka cathode voltage v ref 36 v i ka cathode current 0. 05 100 ma t a operating ambient temperature range - 40 +125 oc ref v ref cathode anode + -
a s431i document number: ds 36816 rev. 2 - 2 5 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated electrical characteristics ( operating conditions: t a = + 25 oc, unless otherwise specified . ) symbol parameter test circuit conditions min typ max unit v ref reference voltage 0.5% 4 v ka = v ref , i ka = 10ma 2.487 2.500 2.512 v 1.0% 2.475 2.500 2.525 ? v ref deviation of reference voltage over full temperature range 4 v ka = v ref , i ka = 10ma 0 to +70c C 4.5 8 mv - 40 to +85c C 4.5 10 - 40 to +125c C 4.5 16 ? v ref ? v ka ratio of change in reference voltage to the change in cathode voltage 5 i ka = 10ma ? v ka = 10v to v ref C - 1.0 - 2.7 mv/v ? v ka = 36v to 10v C - 0.5 - 2.0 i ref reference current 5 i ka = 10ma, r1 = 10k?, r2 = C 0. 035 0. 5 a ? i ref deviation of reference current over full temperature range 5 i ka = 10ma, r1 = 10k?, r2 = , t a = - 40 to +125c C 0.03 0.3 a i ka (min) minimum cathode current for regulation 4 v ka = v ref C 10 50 a i ka (off) off - state cathode current 6 v ka = 3 6v, v ref = 0 C 0.0 5 1.0 a z ka dynamic impedance 4 v ka = v ref , i ka = 1 to 100ma, f 1.0khz C 0. 15 0. 5 ? jc thermal resistance C to - 92 C 68 C c/w sot - 89 C 29 C sot - 23 C 113 C
a s431i document number: ds 36816 rev. 2 - 2 6 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated electrical characteristics ( cont. ) test circuit 4 for v ka = v ref test circuit 5 for v ka > v ref test circuit 6 for i off v i n v k a r 1 i k a v r e f v i n v k a i k a r 1 r 2 v r e f v k a = v r e f ( 1 + r 1 / r 2 ) + i r e f * r 1 i r e f r 3 i o f f v i n v k a r 1
a s431i document number: ds 36816 rev. 2 - 2 7 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated performance characteristics reference voltage vs. ambient temperature reference current vs. ambient temperature cathode current vs. cathode voltage cathode current vs. cathode voltage off - state cathode current vs. ambient temperature ratio of delta reference voltage to the ratio of delta cathode voltage -40 -20 0 20 40 60 80 100 120 0.020 0.025 0.030 0.035 0.040 0.045 0.050 0.055 reference current ( ? a) temperature ( o c) r1=10k, r2=infinite i ka =10ma -60 -40 -20 0 20 40 60 80 100 120 140 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 off-state cathode current ( ? a) temperature ( 0 c) v ka =36v v ref =0 -60 -40 -20 0 20 40 60 80 100 120 140 2.48 2.49 2.50 2.51 2.52 reference voltage (v) temperature ( 0 c) v ka =v ref i ka =10ma -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -50 -40 -30 -20 -10 0 10 20 30 40 50 cathode current ( ? a) cathode voltage (v) v ka =v ref t a =25 o c -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -120 -100 -80 -60 -40 -20 0 20 40 60 80 100 120 cathode current (ma) cathode voltage (v) v ka =v ref t a =25 o c -60 -40 -20 0 20 40 60 80 100 120 140 -0.6 -0.4 -0.2 0.0 0.2 0.4 ? v ref / ? v ka (mv/v) temperature ( 0 c) v ka =3.5v to 36v
a s431i document number: ds 36816 rev. 2 - 2 8 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated performance characteristics (cont.) small signal voltage gain vs. frequency stability boundary conditions vs. load capacitance pulse response of input and output voltage pulse generator f=100khz 220 50 output gnd 1k 10k 100k -30 -20 -10 0 10 20 30 40 50 60 small signal voltage gain (db) frequence (hz) i ka =10ma t a =25 o c 300k 0 10 20 30 40 50 60 70 80 90 100 stable 10 1 0.1 0.01 cathode current (ma) load capacitor ( ? f) v ka =v ref v ka =5v v ka =10v v ka >10v, no oscillation 0.001 stable v in v out i ka r 1 ( 10 k ) r 2 150 10 ? f 8.2k 15k i ka output 242 gnd
a s431i document number: ds 36816 rev. 2 - 2 9 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated ordering information diodes ics pb - free products with "g1" suffix in the part number, are rohs compliant and green . package temperature range voltage tolerance part number marking id packing type sot - 23 - 40 to +125 c 0.5% as431 i antr - g 1 gb 8 tape & reel 1.0% as431 ibntr - g1 gc9 tape & reel to - 92 - 40 to +125 c 0.5% as431 i az - g1 as431 i az - g1 bulk 0.5% as431 i aztr - g1 as431 i az - g1 ammo 1.0% as431 i bz - g1 as431 i bz - g1 bulk 1.0% as431 i bztr - g1 as431 i bz - g1 ammo sot - 89 - 40 to +125 c 0.5% as431 i artr - g1 g43j tape & reel 1.0% as431 i brtr - g1 g43k tape & reel a s 4 3 1 i x x x x C p a c k i n g p a c k a g e t r : t a p e & r e e l a : 0 . 5 % b : 1 . 0 % p r o d u c t n a m e b l a n k : b u l k g 1 : g r e e n v o l t a g e t o l e r a n c e z : t o - 9 2 n : s o t - 2 3 r : s o t - 8 9 o r a m m o r o h s / g r e e n
a s431i document number: ds 36816 rev. 2 - 2 10 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated package outline dimensions (all dimensions in mm (inch) .) (1) package type: to - 92 (bulk packing) 2 . 4 2 0 ( 0 . 0 9 5 ) 2 . 6 6 0 ( 0 . 1 0 5 ) 0 . 3 6 0 ( 0 . 0 1 4 ) 0 . 7 6 0 ( 0 . 0 3 0 ) 1 . 6 0 0 ( 0 . 0 6 3 ) m a x 1 2 . 5 0 0 ( 0 . 4 9 2 ) 1 5 . 5 0 0 ( 0 . 6 1 0 ) 1 . 2 7 0 ( 0 . 0 5 0 ) t y p 3 . 3 0 0 ( 0 . 1 3 0 ) 3 . 7 0 0 ( 0 . 1 4 6 ) 4 . 3 0 0 ( 0 . 1 6 9 ) 4 . 7 0 0 ( 0 . 1 8 5 ) 1 . 0 0 0 ( 0 . 0 3 9 ) 1 . 4 0 0 ( 0 . 0 5 5 ) 4 . 4 0 0 ( 0 . 1 7 3 ) 4 . 8 0 0 ( 0 . 1 8 9 ) 3 . 4 3 0 ( 0 . 1 3 5 ) m i n 0 . 3 2 0 ( 0 . 0 1 3 ) 0 . 5 1 0 ( 0 . 0 2 0 ) 0 . 0 0 0 ( 0 . 0 0 0 ) 0 . 3 8 0 ( 0 . 0 1 5 )
a s431i document number: ds 36816 rev. 2 - 2 11 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated package outline dimensions ( cont. all d imensions in mm ( inch ) . ) (2) package type: to - 92 (ammo packing) 4 . 3 0 0 ( 0 . 1 6 9 ) 4 . 7 0 0 ( 0 . 1 8 5 ) 1 2 . 5 0 0 ( 0 . 4 9 2 ) 1 4 . 5 0 0 ( 0 . 5 7 1 ) 2 . 5 4 0 ( 0 . 1 0 0 ) t y p 1 . 2 7 0 ( 0 . 0 5 0 ) t y p 0 . ( 0 . 0 1 5 ) 0 . 5 5 0 ( 0 . 0 2 2 ) 4 . 4 0 0 ( 0 . 1 7 3 ) 4 . 8 0 0 ( 0 . 1 8 9 ) 3 . 4 3 0 ( 0 . 1 3 5 ) m i n 0 . 3 2 0 ( 0 . 0 1 3 ) 0 . 5 1 0 ( 0 . 0 2 0 ) 0 . 0 0 0 ( 0 . 0 0 0 ) 0 . 3 8 0 ( 0 . 0 1 5 ) m a x 1 . 1 0 0 ( 0 . 0 4 3 1 . 4 0 0 ( 0 . 0 5 5 ) 3 . 3 0 0 ( 0 . 1 3 0 ) 3 . 8 0 0 ( 0 . 1 5 0 ) 1 . 6 0 0 ( 0 . 0 6 3 ) ) 3 8 0 2 . 5 0 0 ( 0 . 0 9 8 ) 4 . 0 0 0 ( 0 . 1 5 7 ) 1 3 . 0 0 0 ( 0 . 5 1 2 ) 1 5 . 0 0 0 ( 0 . 5 9 1 )
a s431i document number: ds 36816 rev. 2 - 2 12 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated package outline dimensions ( cont. all dimensions in mm (inch) .) (3) package type: sot - 23 2 . 3 0 0 ( 0 . 0 9 1 ) 2 . 5 0 0 ( 0 . 0 9 8 ) 1 . 2 0 0 ( 0 . 0 4 7 ) 1 . 4 0 0 ( 0 . 0 5 5 ) 0 . 8 9 0 ( 0 . 0 3 5 ) 1 . 0 3 0 ( 0 . 0 4 1 ) 0 . 3 0 0 ( 0 . 0 1 2 ) 0 . 5 1 0 ( 0 . 0 2 0 ) 1 . 9 0 0 ( 0 . 0 7 5 ) r e f 2 . 8 0 0 ( 0 . 1 1 0 ) 3 . 0 0 0 ( 0 . 1 1 8 ) 2 . 0 3 . 0 0 . 5 0 0 ( 0 . 0 2 0 ) 0 . 7 0 0 ( 0 . 0 2 8 ) 1 . 0 5 0 ( 0 . 0 4 1 ) r e f 0 . 0 1 0 ( 0 . 0 0 0 4 ) 0 . 1 0 0 ( 0 . 0 0 4 ) 0 . 9 0 0 ( 0 . 0 3 5 ) 1 . 1 0 0 ( 0 . 0 4 3 ) 4 r 0 . 1 0 0 ( 0 . 0 0 4 ) 7 . 0 7 . 0 0 . 5 5 0 ( 0 . 0 2 2 ) r e f 0 . 2 0 0 ( 0 . 0 0 8 ) m i n 0 . 1 0 0 ( 0 . 0 0 4 ) g a u g e p l a n e 0 . 0 8 0 ( 0 . 0 0 3 ) 0 . 1 8 0 ( 0 . 0 0 7 ) r 0 . 1 0 0 ( 0 . 0 0 4 ) 0 . 0 ~ 1 0 . 0
a s431i document number: ds 36816 rev. 2 - 2 13 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated package outline dimensions ( cont. all dimensions in mm (inch) .) (4) package type: sot - 89 4 5 1 . 5 5 0 ( 0 . 0 6 1 ) r e f 4 . 4 0 0 ( 0 . 1 7 3 ) 4 . 6 0 0 ( 0 . 1 8 1 ) 0 . 9 0 0 ( 0 . 0 3 5 ) 1 . 2 0 0 ( 0 . 0 4 7 ) 3 . 9 5 0 ( 0 . 1 5 6 ) 4 . 2 5 0 ( 0 . 1 6 7 ) 3 . 0 0 0 ( 0 . 1 1 8 ) t y p 0 . 4 8 0 ( 0 . 0 1 9 ) 2 . 3 0 0 ( 0 . 0 9 1 ) 2 . 6 0 0 ( 0 . 1 0 2 ) 0 . 3 2 0 ( 0 . 0 1 3 ) 0 . 5 4 0 ( 0 . 0 2 1 ) 3 1 0 2 . 0 6 0 ( 0 . 0 8 1 ) r e f 1 . 4 0 0 ( 0 . 0 5 5 ) 1 . 6 0 0 ( 0 . 0 6 3 ) 0 . 3 5 0 ( 0 . 0 1 4 ) 0 . 4 5 0 ( 0 . 0 1 8 ) r 0 . 1 5 0 ( 0 . 0 0 6 ) 3 1 0 1 . 5 0 0 ( 0 . 0 5 9 ) 0 . 3 2 0 ( 0 . 0 1 3 ) r e f 1 . 6 2 0 ( 0 . 0 6 4 ) r e f 2 . 2 1 0 ( 0 . 0 8 7 ) r e f 0 . 3 2 0 ( 0 . 0 1 3 ) 0 . 5 4 0 ( 0 . 0 2 1 ) 1 . 8 0 0 ( 0 . 0 7 1 ) o p t i o n 1 o p t i o n 2 0 . 6 2 0 ( 0 . 0 2 4 ) 1 . 0 3 0 ( 0 . 0 4 1 ) r e f r 0 . 2 0 0 ( 0 . 0 0 8 ) 1 . 6 2 0 ( 0 . 0 6 4 ) 1 . 8 3 0 ( 0 . 0 7 2 ) 2 . 6 3 0 ( 0 . 1 0 4 ) 2 . 9 3 0 ( 0 . 1 1 5 ) o p t i o n 1
a s431i document number: ds 36816 rev. 2 - 2 14 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated suggested pad layout (1) package type: sot - 23 dimensions z (mm)/(inch) g (mm)/(inch) x (mm)/(inch) y (mm)/(inch) e (mm)/(inch) value 2.900/0.114 1.100/0.043 0.800/0.031 0.900/0.035 0.950/0.037 y g z y x e g r i d p l a c e m e n t c o u r t y a r d
a s431i document number: ds 36816 rev. 2 - 2 15 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated suggested pad layout (cont.) (2) package type: sot - 89 dimensions z (mm)/(inch) x (mm)/(inch) x1 (mm)/(inch) x2 (mm)/(inch) y (mm)/(inch) y1 (mm)/(inch) e (mm)/(inch) value 4.600/0.181 0.550/0.022 1.850/0.073 0.800/0.031 1.300/0.051 1.475/0.058 1.500/0.059 x 1 x 2 y 1 e x y z
a s431i document number: ds 36816 rev. 2 - 2 16 of 16 www.diodes.com january 2014 ? diodes incorporated AS431I a product line of diodes incorporated important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other c hanges without further notice to this document and any product described herein. diodes incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license unde r its patent or trademark rights, nor the rights of others. any customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diod es incorporated website, harmless against all damages. diodes incorporated do es not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemni fy and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising ou t of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized applicat ion. products described herein may be covered by one or more united states, international or foreign patents pending. product nam es and markings noted herein may also be covered by one or more united states, international or foreign trademarks. this doc ument is written in english but may be translated into multiple languages for reference. only the english version of this do cument is the final and determinative format released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or s ystems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided i n the labeling can be reasonably expected to result in signific ant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expe cted to cause the failure of the life support device or to affect its safety or effectiveness. cu stomers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety - related requiremen ts concerning their products and any use of diodes incorporated products in such safety - critical, life support devices or systems, notwithstanding any devices - or systems - related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety - critical, life support devices or systems. copyright ? 2012, diodes incorporated www.diodes.com

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