1 of 6 1 description the IW873 is a high performance synchronous rectifer controller with integrated mosfet and driver for fyback converters operating at discontinuous conduction mode. it emula tes the diode rectifer at the secondary side of the fyback to reduce conduction loss. the IW873 determines the timing of the driver by sensing the voltage across the r ds(on) of the built-in mosfet to achieve lossless sensing. proprietary digital adaptive turn-off control technology is used to minimize the turn-off deadtime of the synchronous rectifer so that the parallel schottky diode required by conventional synchronous rectifers can be eliminated. the integrated driver has strong driving capability for high effciency. the operating power consumption of the controller excluding the driver is less than 4mw at no load to achieve the ultra-low no-load power consumption for 5v applications. the IW873 integrates a pulse linear regulator to maintain the operation of the synchronous rectifer at low system output voltage when the system is operating in constant current (cc) mode. 2 features integrated 60v power mosfet digital adaptive turn-off control minimizes dead-time and eliminates the parallel schottky diode integrated pulse linear regulator (plr) allows sr operation at low system output voltage down to 2.4v in typical 5v, 2a usb charger applications with IW873-00 v out rtn 1 2 8 7 3 6 gnd IW873 + drain out v cc v in + 4 5 drain drain gnd 3 applications compact ac/dc adapters/chargers for media tablets and smart phones wide v in pin operating voltage up to 25v intelligent low power management achieves ultra-low no-load operating current lossless mosfet v ds sensing for sr timing control 8-pin soic package figure 3.1 : IW873 typical application circuit IW873 digital green-mode synchronous rectifer rev. 1.0 product summary ? 2016 dialog semiconductor www.dialog-semiconductor.com 2-june-2016
2 of 6 figure 3.2 : IW873-00 typical application circuit (using iw1602 as primary-side controller) (achieving <75mw no-load power consumption in 5v, 2a adapter designs with fast dynamic load response, and supporting constant current operation down to 2.4v system output) v out rtn 1 2 8 7 3 6 gnd IW873 + drain out v cc v in + 4 5 drain drain gnd l + u1 iw1602 v cc v sense cfg output gnd cs/fs r fs r isns r cdc 1 5 3 6 4 2 n IW873 digital green-mode synchronous rectifer rev. 1.0 product summary ? 2016 dialog semiconductor www.dialog-semiconductor.com 2-june-2016
3 of 6 4 pinout description 1 2 8 7 3 6 gnd IW873 drain out v cc v in 4 5 drain drain gnd figure 4.1 : 8-lead soic package pin no. pin name type pin description 1 out power output synchronous rectifer mosfet driver output and the gate of the integrated mosfet. leave this pin open if not used. 2 drain power input synchrnous rectifer mosfet drain. 3 drain power input synchrnous rectifer mosfet drain. 4 drain power input synchrnous rectifer mosfet drain. 5 gnd ground synchrnous rectifer mosfet source and controller ground. 6 gnd ground synchrnous rectifer mosfet source and controller ground. 7 v cc power input ic power supply and output of ldo and plr output. connect this pin to a capacitor. 8 v in analog input input of the internal ldo and system output voltage sensing circuit. connects to adapter/charger output for bias voltage. the internal ldo clamps the v cc voltage at 5v. it is also the input for the comparator to enable plr and the comparator to enable sr operation. IW873 digital green-mode synchronous rectifer rev. 1.0 product summary ? 2016 dialog semiconductor www.dialog-semiconductor.com 2-june-2016
4 of 6 absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. 5 absolute maximum ratings parameter symbol value units v in dc supply voltage range (pin 8, i cc = 15ma max) v in -0.3 to 33 v continuous dc supply current at v in pin (v in = 30v) i vo 15 ma continuous dc supply current at v cc pin (v cc = 5.5v) i vcc 15 ma drain pin voltage v d -1.5 to 60 v v cc pin voltage v cc -0.6 to 6 v junction temperature t j -40 to 150 c storage temperature C65 to 150 c thermal resistance junction-to-ambient (soic-8 package) ja_so8 tbd c/w esd rating per jedec jesd22-a114 2,000 v IW873 digital green-mode synchronous rectifer rev. 1.0 product summary ? 2016 dialog semiconductor www.dialog-semiconductor.com 2-june-2016
5 of 6 6 physical dimensions 7 ordering information compliant to jedec standard ms12f controlling dimensions are in inches; millimeter dimensions are for reference only this product is rohs compliant and halide free. soldering temperature resistance: [a] package is ipc/jedec std 020d moisture sensitivity level 1 [b] package exceeds jedec std no. 22-a111 for solder immersion resistance; package can withstand 10 s immersion < 260?c dimension d does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.15 mm per end. dimension e1 does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25 mm per side. the package top may be smaller than the package bottom. dimensions d and e1 are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 8-lead small outline (soic) package coplanarity 0.10 (0.004) 8 5 4 1 seating plane a1 e h b d e a a2 c l h x 45 inches symbol millimeters min 0.0040 a1 max min max 0.0098 0.10 0.25 a 0.069 1.75 0.0123 b 0.0200 0.31 0.51 0.0075 c 0.0098 0.19 0.25 0.189 d 0.197 4.80 5.00 0.1495 e 0.1575 3.80 4.00 0.050 bsc e 1.27 bsc 0.2284 h 0.2440 5.80 6.20 0.0098 bsc h 0.25 bsc 0.0158 l 0.050 0.4 1.27 0 8 0.0520 a2 0.0600 1.32 1.50 0 8 part no. options package description IW873-00 support cc operation down to 2.4v soic, 8 pin tape & reel 1 note 1: tape and reel packing quantity is 2,500/reel. minimum ordering quantity is 2,500. IW873 digital green-mode synchronous rectifer rev. 1.0 product summary ? 2016 dialog semiconductor www.dialog-semiconductor.com 2-june-2016
disclaimer information in this document is believed to be accurate and reliable. however , dialog semiconductor does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information. dialog semiconductor furthermore takes no responsibility whatsoever for the content in this document if provided by any information source outside of dialog. dialog semiconductor reserves the right to change without notice the information published in this document, including without limitation the specifcation and the design of the related semiconductor products, software and applications. applications, software, and semiconductor products described in this document are for illustrative purposes only . dialog makes no representation or warranty that such applications, software and semiconductor products will be suitable for the specifed use without further testing or modifcation. unless otherwise agreed in writing, such testing or modifcation is the sole responsibility of the customer and dialog excludes all liability in this respect. customer notes that nothing in this document may be construed as a license for customer to use the dialog products, software and applications referred to in this document. such license must be separately sought by customer with dialog semiconductor . all use of dialog semiconductor products, software and applications referred to in this document are subject to dialog semiconductors standard terms and conditions of sale , available on the company website ( www.dialog-semiconductor.com ) unless otherwise stated. dialog and the dialog logo are trademarks of dialog semiconductor plc or its subsidiaries. all other product or service names are the property of their respective owners. ? copyright 2016 dialog semiconductor. all rights reserved. rohs compliance dialog semiconductor complies to european directive 2001/95/ec and from 2 january 2013 onwards to european directive 201 1/65/eu concerning restriction of hazardous substances (rohs/rohs2). dialog semiconductors statement on rohs can be found on the customer portal https://support.diasemi.com/ . rohs certifcates from our suppliers are available on request. 6 of 6 contacting dialog semiconductor united kingdom dialog semiconductor (uk) ltd phone: +44 1793 757700 germany dialog semiconductor gmbh phone: +49 7021 805-0 the netherlands dialog semiconductor b.v. phone: +31 73 640 88 22 email info_pcbg@diasemi.com north america dialog semiconductor inc. phone: +1 408 845 8500 japan dialog semiconductor k. k. phone: +81 3 5425 4567 taiwan dialog semiconductor taiwan phone: +886 281 786 222 web site: www.dialog-semiconductor.com singapore dialog semiconductor singapore phone: +65 648 499 29 hong kong dialog semiconductor hong kong phone: +852 2607 4271 korea dialog semiconductor korea phone: +82 2 3469 8200 china dialog semiconductor (shenzhen) phone: +86 755 2981 3669 dialog semiconductor (shanghai) phone: +86 21 5424 9058 IW873 digital green-mode synchronous rectifer rev. 1.0 product summary ? 2016 dialog semiconductor www.dialog-semiconductor.com 2-june-2016
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