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EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 1 of 14 www.elitemicropower.com 1.5mhz 600ma, synchronous step-down regulator general description EML3406 is designed with high efficiency step down dc/dc converter for portable devices applications. it features with extreme low quiescent current with no load which is the best fit for extending battery li fe during the standby mode. the device operates from 2.5v to 5.5v input voltage and up to 600ma output current capability. high 1.5mhz internal frequency makes sm all surface mount inductors and capacitors possible and reduces overall pcb board space. further, build-in synchronous switch makes external schottky diode is no longer needed and efficiency is improved. EML3406 is designed base on pulse width modulation (pwm) for low output voltage ripple and fixed frequency noise , low dropout mode provides 100% duty cycle operation . low reference voltage is designed for achieving regulated output down to 0.6v. the device is available in an adjustable version an d fixed output voltages of 1.2v, 1.5v, 1.8v and 3.3v. the EML3406 is available in sot-5 package. features achieve 95% efficiency input voltage : 2.5v to 5.5v output current up to 600ma reference voltage 0.6v quiescent current 200 a with no load internal switching frequency 1.5mhz no schottky diode needed low dropout operation: 100% duty cycle shutdown current < 1 a excellent line and load transient response over-temperature protection applications blue-tooth devices cellular and smart phones personal multi-media player (pmp) wireless networking digital still cameras portable applications typical application (adjustable) fig. 1 fig. 2 vout 2.7v sw 3 v fb 5 4 v in 1 en 2 gnd 2.2 uh 22 pf cout 10uf cer vin 3.3 ? 5.5v cin 4.7 uf cer r2 (350k ) r1 (100k ) en micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 2 of 14 www.elitemicropower.com connection diagram order information sot-25 EML3406-xxvf05grr xx output voltage vf05 sot-25 package grr rohs package rating: -40 to 85c package in tape & reel nrr rohs & halogen free package(by request) order, mark & packing information marking product id package vout order information new old packing 1.2 EML3406-12vf05grr l601 date code 1.5 EML3406-15vf05grr l604 date code 1.8 EML3406-18vf05grr l607 date code EML3406 sot-25 3.3 EML3406-33vf05grr l60m date code EML3406 sot-25 adjustable EML3406-00vf05grr l600 date code tape & reel 3kpcs en 1 gnd 2 sw 3 4 v in 5 v fb micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 3 of 14 www.elitemicropower.com package configuration pin functions pin # pin name function 1 en enable pin. minimum 1.2v to enable the device. maximum 0.4v to shut down the device. do not leave this pin floating and enable the chip after v in is in the input voltage range. 2 gnd ground pin. 3 sw switch pin. must be connected to inductor. this pin connects to the drains of the internal main and synchronous power mosfet switches. 4 v in input voltage pin. must be closely decoupled to gnd pin with a 4.7f o r greater ceramic capacitor. v fb (adjustable) feedback pin. receives the feedback voltage from an external resi stive divider across the output. 5 v out (fixed voltage) output voltage pin. an internal resistive divider divides the output vo ltage down for comparison to the internal reference voltage. adjustable sot-25 t jmax =125 c, ja =250 c, jc =90 c /w en 1 gnd 2 sw 3 4 v in 5 v fb fixed voltage sot-25 t jmax =125 c, ja =250 c, jc =90 c /w en 1 gnd 2 sw 3 4 v in 5 v out micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 4 of 14 www.elitemicropower.com absolute maximum ratings devices are subjected to failure if they stay above absolute maximum ratings. input voltage ------------------------------------- --- C 0.3v to 6v en, v fb voltages ------------------------------------- C 0 .3v to v in sw voltage ------------------------------- C 0.3v t o (v in + 0.3v) pmos switch source current (dc) ----------------- 8 00ma nmos switch sink current (dc) --------------------- - 800ma peak switch sink and source current --------------- -- 1.3a operating temperature range ---------- C40c to 85 c junction temperature (notes 1, 3) ----------------- --- 125c storage temperature range -------------- C 65c to 150c lead temperature (soldering, 10 sec) --------------- - 240c esd susceptibility hbm ---------------------------- -------------- 2kv mm ------------------------------- --------- 200v electrical characteristics the denotes specifications which apply over the full o perating temperature range, otherwise specification s are t a = 25c. v in = 3.6v unless otherwise specified. symbol parameter conditions min typ max units i vfb feedback current 30 na v fb regulated feedback voltage t a = 25c 0.588 0.600 0.612 v v fb reference voltage line regulation v in = 2.5v to 5.5v 0.4 %/v v out % output voltage accuracy -3 3 % v ovl = v ovl C v fb , EML3406 20 50 80 mv v ovl output over-voltage lockout v ovl = v ovl C v out , EML3406-fixed 2.5 7.8 13 % v out output voltage line regulation v in = 2.5v to 5.5v 0.4 %/v i pk peak inductor current v in = 3v, v fb = 0.5v or v out = 90%, duty cycle < 35% 1.0 a v loadreg output voltage load regulation 0.5 % quiescent current (note 2) v fb = 0.5v or v out = 90% 200 340 a i s shutdown v en = 0v, v in = 4.2v 0.1 1 a oscillator frequency v fb = 0.6v or v out = 100% 1.2 1.5 1.8 mhz f osc v fb = 0v or v out = 0v 290 khz r pfet r ds(on) of pmos i sw = 100ma 0.45 0.55 r nfet r ds(on) of nmos i sw = C100ma 0.40 0.5 i lsw sw leakage v en = 0v, v sw = 0v or 5v, v in = 5v 1 a enable threshold 1.2 v v en shutdown threshold 0.4 v i en en leakage current 1 a note 1: t j is a function of the ambient temperature t a and power dissipation p d ( t j = t a + (p d )(250c/w) ) note 2: dynamic quiescent current is higher due to the gat e charge being delivered at the switching frequency . note 3: this ic is build-in over-temperature protection to avoid damage from overload conditions. micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 5 of 14 www.elitemicropower.com typical performance characteristics efficiency vs output current efficiency vs output current output voltage vs load current efficiency vs output current efficiency vs output current reference voltage vs temperature micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 6 of 14 www.elitemicropower.com r ds(on) vs temperature dynamic supply current vs temperature oscillator frequency vs temperature r ds(on) vs input voltage dynamic supply current vs supply voltage oscillator frequency vs supply voltage micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 7 of 14 www.elitemicropower.com typical performance characteristics discontinuous operation load step load step start-up from shutdown load step load step i load 5 00ma/div i l 500ma/div v in =3.6v 2 0 s/div v out =1.8v i load =100ma to 600ma v in =3.6v 1 s/div v out =1.8v i load =50ma i l 2 00ma/div sw 2v/div v out 10mv/div ac coupled en 5v/div v out 1v/div v in =3.6v 4 0 s/div v out =1.8v i load =600ma (3 resistor) i l 5 00ma/div v out 100m/div ac coupled i l 500ma/div v in =3.6v 2 0 s/div v out =1.8v i load =0ma to 600ma i load 5 00ma/div v out 100m/div ac coupled i l 500ma/div i load 5 00ma/div v in =3.6v 2 0 s/div v out =1.8v i load =50ma to 600ma v out 100m/div ac coupled i load 5 00ma/div v out 100m/div ac coupled i l 500ma/div v in =3.6v 2 0 s/div v out =1.8v i load =200ma to 600ma micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 8 of 14 www.elitemicropower.com functional block diagram micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 9 of 14 www.elitemicropower.com applications the typical application circuit of adjustable versi on is shown in fig.1. fixed voltage version is shown below: inductor selection basically, inductor ripple current and core saturat ion are two factors considered to decide the inductor value. ? ? ? ? ? ? ? ? ? ? = ? in v out v out v l i 1 1 l f eq. 1 the eq. 1 shows the inductor ripple current is a fu nction of frequency, inductance, vin and vout. it is recommended to set ripple current to 40% of max. lo ad current. a low esr inductor is preferred. c in and c out selection a low esr input capacitor can prevent large voltage transients at v in . the rms current of input capacitor is required larger than i rms calculated by: ( ) in out in out v v v v omax i rms i ? ? eq. 2 esr is an important parameter to select c out . the output ripple v out is determined by: ? ? ? ? ? ? ? ? ? ? + ? ? ? out c f 8 1 l i out v esr eq. 3 higher values, lower cost ceramic capacitors are no w available in smaller sizes. these ceramic capacitor s have high ripple currents, high voltage ratings and low esr that make them ideal for switching regulator applications. optimize very low output ripple and s mall circuit size is doable from cout selection since co ut does not affect the internal control loop stability . it is recommended to use the x5r or x7r which have the best temperature and voltage characteristics of all the ceramics for a given value and size. output voltage (EML3406 adjustable) in the adjustable version, the output voltage can b e determined by: ? ? ? ? ? ? ? ? + = 1 r 2 r 1 v out v 6.0 eq. 4 thermal considerations although thermal shutdown is build-in in EML3406 th at protect the device from thermal damage, the total power dissipation that EML3406 can sustain should b e base on the package thermal capability. the formula to ensure the safe operation is shown in note 1. to avoid the EML3406 from exceeding the maximum junction temperature, the user will need to do some thermal analysis. guidelines for pcb layout to ensure proper operation of the EML3406, please n ote the following pcb layout guidelines: 1. the gnd trace, the sw trace and the v in trace should be kept short, direct and wide. 2. v fb pin must be connected directly to the feedback resistors. resistive divider r 1 /r 2 must be connected and parallel to the output capacitor c out . 3. the input capacitor c in must be connected to pin v in as closely as possible. 4. keep sw node away from the sensitive v fb node since this node is with high frequency and voltage swing. 5. keep the (C) plates of c in and c out as close as possible. vout 1.8v sw 3 v fb 5 4 v in 1 en 2 gnd 2.2 uh cout 10uf cer vin 2.5 ? 5.5v cin 4.7 uf cer en micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 10 of 14 www.elitemicropower.com applications (continued) output voltage ripple when v in closes to v out EML3406 goes into ldo mode when input voltage closes to output voltage. the transition from pwm m ode to ldo mode is smooth. bottom diagram shows the relationship of output voltage ripple versus input voltage when output voltage is 3.3v and EML3406 provides 200ma load current. v out ripple when v in closes to v out design example assume the EML3406 is used in a single lithium-ion battery-powered application. the v in range will be about 2.7v to 4.2v. output voltage is 1.8v. with this information we can calculate l using equa tion: ? ? ? ? ? ? ? ? ? ? ? = in v out v out v l i 1 1 l f substituting v out = 1.8v, v in = 4.2v, ? i l = 240ma and f = 1.5mhz in eq. 1 gives: h 86.2 1 240ma 1.5mhz 1.8v l = ? ? = ? ? ? ? ? ? 4.2v 1.8v a 2.2h inductor could be chose with this applicati on. a greater inductor with less equivalent series resi stance makes best efficiency. c in will require an rms current rating of at least i load(max) /2 and low esr. in most cases, a ceramic capacitor will satisfy this requirement. micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 11 of 14 www.elitemicropower.com application (continued) typical schematic for pcb layout en micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 12 of 14 www.elitemicropower.com bottom top micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 13 of 14 www.elitemicropower.com package information sot-25 o 2 symbpls min. nom. max. a 1.05 1.20 1.35 a1 0.05 0.10 0.15 a2 1.00 1.10 1.20 b 0.30 0.50 c 0.08 0.20 d 2.80 2.90 3.00 e 2.60 2.80 3.00 e1 1.50 1.60 1.70 e 0.95 bsc e1 1.90 bsc l 0.30 0.45 0.55 l1 0.60 ref ? 0 5 10 2 6 8 10 unit: mm micro bridge technology co.,ltd.
EML3406 elite micropower inc. elite micropower inc. reserves the right to make ch anges to improve reliability or manufacturability w ithout notice, and customers are advised to obtain the latest vers ion of relevant information prior to placing orders . dsl3406_v7.3 july 11 th 2008 page 14 of 14 www.elitemicropower.com ? copyright 2006 all rights reserved. no part of this document may be reproduced or dupli cated in any form or by any means without the prior permission of emp. the contents contained in this document are believe d to be accurate at the time of publication. emp as sumes no responsibility for any error in this document, and reserves the right to change the products or specif ication in this document without notice. the information contained herein is presented only as a guide or examples for the application of our p roducts. no responsibility is assumed by emp for any infringeme nt of patents, copyrights, or other intellectual pr operty rights of third parties which may result from its use. no license, express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of emp or others. any semiconductor devices may have inherently a cer tain rate of failure. to minimize risks associated with customer's application, adequate design and operating safeguar ds against injury, damage, or loss from such failur e, should be provided by the customer when making application de signs. emp's products are not authorized for use in critic al applications such as, but not limited to, life s upport devices or system, where failure or abnormal operation may dir ectly affect human lives or cause physical injury o r property damage. if products described here are to be used f or such kinds of application, purchaser must do its own quality assurance testing appropriate to such applications. micro bridge technology co.,ltd.

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