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zxre160 document number: ds35688 rev. 2 - 2 1 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated 0.6v enhanced adjustable precision shunt regulator description the zxre160 is a 5-terminal adjustable shunt regulator offering excellent temperature stability and output handling capability. this device offers an enhancement to the zxre060 part for use in a comparator mode applications. in shunt regulator mode, the zxre160 simplifies the design of isolated low voltage dc-dc regulators. with its low 0.6v fb pin, it can control the regulation of rails as low 0.6v. this makes the part ideal for state of the art microprocessor, dsp and pld core voltage pol converters. the device open-collector output can operate from 0.2v to 18v and regulated output voltage can be set by selection of two external divider resistors. separating the input from the open collector output enables the zxre160 to be used to make low-cost low drop-out regulators operating at low input voltages. the zxre160 is available in two grades with initial tolerances of 0.5% and 1% for the a and standard grades res pectively. it is available in space saving low profile 5 pin SC70/sot353, thin tsot25 and very small dfn1520 packages. features ? low reference voltage (v fb = 0.6v) ? -40c to +125c temperature range ? reference voltage tolerance at +25c ? 0.5% zxre160a ? 1% zxre160 ? typical temperature drift ? <4 mv (0c to +70c) ? <6 mv (-40c to +85c) ? <12mv (-40c to +125c) ? 0.2v to 18v open-collector output ? high power supply rejection ? (>45db at 300khz) ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) pin assignments zxre160_h5 (SC70/sot353) and zxre160_et5 (tsot25) zxre160_ft4 (x2-dfn1520-6) applications ? isolated dc-dc converters ? core voltage pol ? low voltage low-dropout linear regulators ? shunt regulators ? adjustable voltage reference notes: 1. no purposely added lead. fully eu directiv e 2002/95/ec (rohs) & 2011/6 5/eu (rohs 2) compliant. 2. see http://www.diodes.com for more in formation about diodes incorpor ated?s definitions of halogen- and antimony-free, "gree n" and lead-free. 3. halogen- and antimony-free "green? products are defined as those which contain <900ppm br omine, <900ppm chlorine (<1500ppm t otal br + cl) and <1000ppm antimony compounds. top view top view 1 2 3 4 5 6 pgnd n/c out fb gnd in exposed flag floating or connect to gnd top view 1 2 3 4 5 6 pgnd n/c out fb gnd in exposed flag floating or connect to gnd top view
zxre160 document number: ds35688 rev. 2 - 2 2 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated typical applications circuit pin descriptions pin name package name pin number function SC70 / sot353, tsot25 x2-dfn1520-6 pgnd 1 1 power ground: ground return for emitter of output transistor: connect pgnd and gnd together. ? ? 2 no connection out 5 3 output: connect a capacitor close to device between out and gnd for closed loop stability. see the applications information section. fb 4 4 feedback input. threshold voltage 600mv nominal. gnd 2 5 analog ground: ground return for reference and amplifier: connect gnd and pgnd together. in 3 6 supply input: connect a 0.1 f ceramic capacitor close to the device from in to gnd. ? ? flag floating or connect to gnd
zxre160 document number: ds35688 rev. 2 - 2 3 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated functional block diagram the zxre160 differs from most other shunt regulators in that it has separate input and output pins and a low voltage reference. this enables it to regulate rails down to 600mv and makes the part ideal for isolated power supply app lications that use opto-couplers in the feedback loop and where the open-collector output is required to operate down to voltages as low as 200mv. the wide input voltage range of 2v to 18v and output voltage range of 0.2v to 18v enables the zxre160 to be powered from an auxiliary rail, while controlling a master rail which is above the auxiliary rail voltage, or below the minimum v in voltage. this allows it to operate as a low-dropout voltage regulator for microprocessor/dsp/pld cores. as with other shunt regulators (and shunt references), the zxre160 compares its internal amplifier fb pin to a high accuracy internal reference; if fb is below the reference then out turns off, but if fb is above the reference then out sinks current ? up to a maximum of 15ma.
zxre160 document number: ds35688 rev. 2 - 2 4 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated absolute maximum ratings (voltages to gnd, @t a = +25c, unless otherwise specified.) symbol parameter rating unit v in in voltage relative to gnd 20 v v out out voltage relative to gnd 20 v v fb fb voltage relative to gnd 20 v p gnd pgnd voltage relative to gnd -0.3 to +0.3 v i out out pin current 20 ma t j operating junction temperature -40 to 150 c t st storage temperature 55 to 150 c these are stress ratings only. operation outside the absolute maximum ratings may cause device failure. operation at the absolute maximum rating for extended periods may reduce device reliability. semiconductor devices are esd sensitive and may be damaged by exposure to esd events. suitable esd precautions should be taken when handling and transporting these devices. package thermal data package ja p dis t a = 25c, t j = 150c SC70/sot353 400c/w 310mw tsot25 250c/w 500mw x2-dfn1520-6 tbd tbd recommended operating conditions (@t a = +25c, unless otherwise specified.) symbol parameter min max units v in in voltage range (0 to +125c) 2 18 v v in in voltage range (-40c to 0c) 2.2 18 v out out voltage range 0.2 18 i out out pin current 0.3 15 ma t a operating ambient temperature range -40 +125 c
zxre160 document number: ds35688 rev. 2 - 2 5 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated electrical characteristics (@t a = +25c, v dd = 3v, unless otherwise specified.) t a = +25c, v in = 3.3v, v out = v fb , i out = 5ma, unless otherwise specified.) (note 4) symbol parameter conditions min typ max units v fb feedback voltage zxre160a 0.597 0.6 0.603 v zxre160 0.594 0.6 0.606 t a = 0c to +85c zxre160a 0.595 0.605 zxre160 0.592 0.608 t a = -40c to +85c zxre160a 0.594 0.606 zxre160 0.591 0.609 t a = -40c to +125c zxre160a 0.593 0.607 zxre160 0.590 0.610 fb load feedback pin load regulation i out = 1 to 15ma 3.8 6 mv t a = -40 to +125c 10 fb line feedback pin line regulation v in = 2v to 18v 0.3 1 mv v in = 2.2v to 18v t a = -40 to +125c 1.5 fb ovr output voltage regulation v out = 0.2v to 18v, i out = 1ma (ref. figure 1) 1 mv t a = -40 to +125c 1.5 i fb fb input bias current v in = 18v -45 na t a = -40 to +125c -200 0 v fb = 0.7v -50 50 i in input current v in = 2v to 18v i out = 0.3ma 0.35 0.7 ma v in = 2.2v to 18v t a = -40 to +125c 1 v in = 2v to 18v i out = 10ma 0.48 1 ma v in = 2.2v to 18v t a = -40 to +125c 1.5 v in = 18v, i out = 0.3ma v fb = 0.7v 3 i out(lk) out leakage current v in = 18v, v out = 18v, v fb =0v 0.1 a t a = +125c 1 z out dynamic output impedance i out = 1 to 15ma f < 1khz 0.25 0.4 t a = -40 to +125c 0.6 psrr power supply rejection ratio f = 300khz v ac = 0.3v pp >45 db bw amplifier unity gain frequency ref: figure 2 600 khz g amplifier transconductance 5000 ma/v note: 4. production testing of the device is performed at +25 c. functional operation of the device and parameters specified over the operating temperature range are guar anteed by design, characterization and process control.
zxre160 document number: ds35688 rev. 2 - 2 6 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated typical characteristics
zxre160 document number: ds35688 rev. 2 - 2 7 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated typical operating characteristics figure 2. test circuits for gain and phase plots gain and phase vs frequency, v ou t =0.6v -50 0 50 100 150 200 1 10 100 1k 10k 100k 1m frequency (hz) ga in (db) 0 45 90 135 180 225 phase (deg) gain phase v out = 0.6v c out = 2 .2uf gain and phase vs frequency, v ou t =0.6v -50 0 50 100 150 200 1 10 100 1k 10k 100k 1m frequency (hz) ga in (db) 0 45 90 135 180 225 phase (deg) gain phase gain phase v out = 0.6v c out = 2 .2uf gain and phase vs frequency, v ou t =6v -50 0 50 100 150 200 1 10 10 0 1k 10 k 100 k 1m frequency (hz) gain (db) 0 45 90 135 180 225 phase (deg) v out = 6v c out = 0. 22uf gain phase gain and phase vs frequency, v ou t =6v -50 0 50 100 150 200 1 10 10 0 1k 10 k 100 k 1m frequency (hz) gain (db) 0 45 90 135 180 225 phase (deg) v out = 6v c out = 0. 22uf gain phase gain phase
zxre160 document number: ds35688 rev. 2 - 2 8 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated application information the following show some typical application examples for the zxre160. figure 3. 15v supply monitor figure 3 shows a typical configuration for the zxre160 in comparator mode. here the comparator switches low when: ( ) 2 21fb m r rrv v + alternative values of r1, r2 may be used to provide different threshold voltages. r3 can also be adjusted to set the bias current for different values of v m . r2 should be kept as low as possible to minimize errors due to the bias current of the fb pin. this circuit has no hysteresis, so a small capacitor of approx.4.7nf between fb and gnd is recommended to provide cleaner transitions at the output. in shunt regulator mode it is necessary to include the compensation capacitor c2 to guarantee stability. c2 may range in value from 0.1f to 10f depending on the application. the minimum value of c2 can be determined from the following equation (resistor values are i n k ): () f rrr r c2 213 2 min + both c1 and c2 should be as close to the zx re160 as possible and connected to it with the shortest possible track. in the case of figure 10 and figure 11, it means the opto-coupler will have to be carefully positioned to enable this. ref out vv = 3r out in i vv 3r ? = figure 4. 0.6v shunt regulator ? ? ? ? ? ? += 2r 1r 1vv ref out 3r out in i vv 3r ? = figure 5. 1.0v shunt regulator
zxre160 document number: ds35688 rev. 2 - 2 9 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated application information (cont.) ref out vv = figure 6. 0.6v series ldo regulator ? ? ? ? ? ? += 2r 1r 1vv ref out figure 7. 1.0v series ldo regulator design guide: 1. determine i out and choose a suitable transistor taking pow er dissipation into consideration. 2. determine i b from )1h( i i (min)fe (max)out b + = 3. determine i r3 from (min)ka i b i 3r i + . the design of the zxre160 effectively means there is no i ka(min) limitation as in conventional references. there is only an output leakage cu rrent which is a maximum of 1a. nevertheless, it is necessary to determine an i ka(min) to ensure that the device operates within its linear range at all times. i ka(min) ? 10a should be adequate for this. 4. determine r3 from 3r be out in i )vv(v 3r +? = . although unlikely to be a problem, ensure that i r3 ? 15 ma.
zxre160 document number: ds35688 rev. 2 - 2 10 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated application information (cont.) ? ? ? ? ? ? += 2r 1r 1vv ref out be out vv2.0v + 3r out in i vv 3r ? = figure 8. 1v current-boosted shunt regulator design guide 1. determine i out and choose a suitable transistor taking pow er dissipation into consideration. 2. determine i b from )1h( i i (min)fe (max)out b + = 3. determine i r3 from (max)out3r ii = 4. determine r3 from 3r out in i vv 3r ? = 5. it is best to let the zxre160 supply as much current as it can before bringing q1 into conduc tion. not only does this minimi ze the strain on q1, it also guarantees the most stable operation. choose a nominal value between 10ma and <15ma for this current, i r4 . calculate r4 from 4r be i v 4r = v out goes low and led is lit when monitored supply ? ? ? ? ? ? + > 2r 1r 1 ref v m v 3r i )2.0 f v( in v 3r +? = )max(f i 3r ima15 ? v f and i f are forward voltage drop and current of led1. figure 9. 1.15v over-voltage indicator
zxre160 document number: ds35688 rev. 2 - 2 11 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated application information (cont.) ref out vv = 3r fin i )2.0v(v 3r +? = )max(f3r iima15 ? figure 10. opto-isolated 0.6v shunt regulator ? ? ? ? ? ? += 2r 1r 1vv ref out 3r fin i )2.0v(v 3r +? = )max(f3r iima15 ? figure 11. opto-isolated 1.0v shunt regulator v f and i f are forward voltage drop and forward current respectively for the optocoupler led more applications information is available in the following publications which can be found on diodes? web site. an58 - designing with diodes? references ? shunt regulation an59 - designing with diodes? references ? series regulation an60 - designing with diodes? references ? fixed regulators and opto-isolation an61 - designing with diodes? references ? extending the operating voltage range an62 - designing with diodes? references ? other applications an63 - designing with diodes? references ? zxre060 low voltage regulator
zxre160 document number: ds35688 rev. 2 - 2 12 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated ordering information tol. part number package identification code reel size tape width quantity/reel 0.5% zxre160aet5ta tsot25 r8 7?, 180mm 8mm 3000 zxre160ah5ta SC70/sot353 r9 7?, 180mm 8mm 3000 zxre160aft4-7 dfn1520h4-6 r8 7?, 180mm 8mm 3000 1% zxre160et5ta tsot25 z8 7?, 180mm 8mm 3000 zxre160h5ta SC70/sot353 z9 7?, 180mm 8mm 3000 zxre160ft4-7 x2-dfn1520-6 z8 7?, 180mm 8mm 3000 marking information 1. tsot25, SC70/sot353 2. x2-dfn1520-6
zxre160 document number: ds35688 rev. 2 - 2 13 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated package outline dimensions (all dimensions in mm.) tsot25 SC70/sot353 x2-dfn1520-6 tsot25 dim min max typ a ? 1.00 ? a1 0.01 0.10 ? a2 0.84 0.90 ? d ? ? 2.90 e ? ? 2.80 e1 ? ? 1.60 b 0.30 0.45 ? c 0.12 0.20 ? e ? ? 0.95 e1 ? ? 1.90 l 0.30 0.50 l2 ? ? 0.25 0 8 4 1 4 12 ? all dimensions in mm sot353 dim min max a 0.10 0.30 b 1.15 1.35 c 2.00 2.20 d 0.65 typ f 0.40 0.45 h 1.80 2.20 j 0 0.10 k 0.90 1.00 l 0.25 0.40 m 0.10 0.22 0 8 all dimensions in mm x2-dfn1520-6 dim min max typ a ? 0.40 ? a1 0 0.05 ? a3 ? ? 0.13 b 0.20 0.30 ? d 1.45 1.575 ? d2 1.00 1.20 ? e ? ? 0.50 e 1.95 2.075 ? e2 0.70 0.90 ? l 0.25 0.35 ? all dimensions in mm c a1 l e1 e a2 d e1 e 5x b 4x 1 l2 a a m j l d b c h k f seating plane a a3 a1 e2 b d e l e d2
zxre160 document number: ds35688 rev. 2 - 2 14 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f diodes incorporated suggested pad layout tsot25 SC70/sot353 x2-dfn1520-6 dimensions value (in mm) c 0.950 x 0.700 y 1.000 y1 3.199 dimensions value (in mm) z 2.5 g 1.3 x 0.42 y 0.6 c1 1.9 c2 0.65 dimensions value (in mm) z 1.25 g1 0.45 g2 0.15 x1 1.10 c 0.50 c1 0.25 g2 g2 c1 c z g1 x 1 x z y c1 c2 c2 g y1 c c x (5x) y (5x)
zxre160 document number: ds35688 rev. 2 - 2 15 of 15 www.diodes.com june 2012 ? diodes incorporated zxre160 new product a product line o f 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 rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or an y product described herein; neither does di odes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or us er of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical component s in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support devic e or system whose failure to perform can be reasonably expect ed to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2012, diodes incorporated www.diodes.com

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