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as1355 300ma, triple ldo www.ams.com/ldos/as1355 revision 1.3 1 - 12 1 general description the as1355 is a high-performance triple cmos low-dropout voltage regulator in a single qfn package. the efficient set of programmable power supplies is optimized to deliver the best compromise between quiescent current and regulator performance for mobile phones, pdas, mp3 players, and other battery powered devices. stability is guaranteed with ceramic output capacitors of only 1f (20% ? x5r) up to 4.7f (20% ? x5r). the low equivalent series resistance (esr) of these capacitors ensures low output impedance at high frequencies. regulation performance is excellent even under low dropout conditions, when the power transistor has to operate in linear mode. the low-noise performance allows direct connection of noise sensitive circuits without additional filtering networks. the as1355 is available in a 16-pin qfn 3x3 package. 2 key features ?? 3 independent voltage regulators with shutdown ?? output current: 300ma each ldo ?? programmable output voltage range: 1.25v to 3.6v in 50mv steps figure 1. as1355 - typical application diagram ?? accuracy: 1.0% ?? psrr: 70db at 1khz, 60db at 100khz ?? load regulation: 3mv (0 to 300ma) ?? supply range: 2.3v to 5.5v ?? 0.1v dropout voltage @ iload = 200ma ?? shutdown current: 1a ?? supply current without load: 160a ?? softstart for low inrush current ?? stable with low esr ceramic capacitors from 1f to 4.7f ?? low noise: 40v rms @10hz to 100khz bandwidth ?? thermal protection ?? over-current protection ?? temperature range: -40c to +85c ?? packages: - 16-pin qfn 3x3 - 16-pin tqfn 3x3 3 applications the as1355 is ideal for cordless and mobile phones, mp3 players, cd and dvd players, pdas, hand-held computers, digital cameras, and any other hand-held battery-powered device. 1f 3.3v c ref = 100nf (improved noise performance) p as1355 vout1 vdd1 en1 en2 en3 gnd ref +5v 1f vdd2 vdd3 1f 1.8v vout2 1f 1.5v vout3 vdda
www.ams.com/ldos/as1355 revision 1.3 2 - 12 as1355 datasheet - pin assignments 4 pin assignments figure 2. pin assignments (top view) 4.1 pin descriptions table 1. pin descriptions pin number pin name description 1en1 active-high enable input 1. pull this pin to gnd to disable the regulated output voltage v out1 . 2vdda analog power supply voltage 3vdd1 unregulated input voltage 1 4vdd2 unregulated input voltage 2 5vout1 regulated output voltage 1 6vout2 regulated output voltage 2 7vout3 regulated output voltage 3 8nc not connected 9vdd3 unregulated input voltage 3 10 nc not connected 11, 12 gnd ground. note: all gnd pins must be connected together externally. 13 ref reference voltage. note: connect to a 100nf capacitor during normal operation. 14 nc not connected 15 en3 active-high enable input 3. pull this pin to gnd to disable the regulated output voltage v out3 . 16 en2 active-high enable input 2. pull this pin to gnd to disable the regulated output voltage v out2 . 17 nc exposed pad. this pad is not connected internally, it can be connected to gnd. gnd vout2 vout1 en3 nc ref 13 6 12 nc 10 5 14 15 en1 1 vdda 2 vdd2 4 as1355 vdd1 3 vout3 7 nc 8 vdd3 9 gnd 11 en2 16 17
www.ams.com/ldos/as1355 revision 1.3 3 - 12 as1355 datasheet - absolute maximum ratings 5 absolute maximum ratings stresses beyond those listed in table 2 may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not imp lied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. table 2. absolute maximum ratings parameter min max units comments electrical parameters vddx, enx to gnd -0.3 7 v voutx to gnd -0.3 5 v all other pins to gnd -0.3 v dd + 0.3 v electrostatic discharge electrostatic discharge hbm 2 kv norm: mil 883 e method 3015 temperature ranges and storage conditions thermal resistance ja 33 oc/w on pcb junction temperature +125 oc storage temperature range -55 +125 oc package body temperature +260 oc the reflow peak soldering temperature (body temperature) specified is in accordance with ipc/ jedec j-std-020?moisture/reflow sensitivity classification for non-hermetic solid state surface mount devices?. humidity non-condensing 5 85 % moisture sensitive level 3 represents a max. floor life time of 168h
www.ams.com/ldos/as1355 revision 1.3 4 - 12 as1355 datasheet - electrical characteristics 6 electrical characteristics v dd = 4v, c out = 1 f, typical values are for t amb = 25c (unless otherwise specified ); note: all limits are guaranteed. the parameters with min and max values are guaranteed with production tests or sqc (statistical qual ity control) methods. table 3. electrical characteristics symbol parameter conditions min typ max unit t amb operating temperature range -40 85 c v dd supply voltage range 2.3 5.5 v v out output voltage range 1.25 3.6 v r on on resistance 0.5 psrr 1 1. guaranteed by design and verified by lab evaluation. power supply rejection ratio f = 1khz, c ref = 100nf 70 db f = 100khz, c ref = 100nf 60 i off shut down current enx = low, t amb = +25c 1 a i vdd supply current without load 160 240 a t set 1 output voltage settling time i load switched from 0 to 100ma 50 s t start 1 start-up time 2 2. startup is performed if any en pin goes high. c ref = 100nf pre-charged 300 s c ref = 0nf uncharged 200 s c ref = 100nf uncharged 15 ms v out output voltage tolerance i load = 0ma, t amb = 25c -1 1 % i load = 0ma -2 2 % v linereg line regulation, static v out(nom) +0.3v to 5.4v -1 1 % v loadreg 1 load regulation, static i load = 0 to 50 ma 0.5 2.5 mv i load = 0 to 300 ma 3 10 mv v ih enable input voltage high 1.5 v v il enable input voltage low 0.4 v i load output current 0 300 ma i limit output current limitation 450 ma v noise output noise voltage 10hz to 100khz, c ref = 100nf 40 v rms thermal protection 150 c
www.ams.com/ldos/as1355 revision 1.3 5 - 12 as1355 datasheet - typical operating characteristics 7 typical operating characteristics v dd = 4v, v out = 3.3v, c out = 1 f, t amb = +25c (unless otherwise specified); figure 3. load regulation; v out vs. i out figure 4. line regulation; v out vs. v in 3.24 3.26 3.28 3.3 3.32 3.34 3.36 0 50 100 150 200 250 300 output current (m a) output voltage (v) 1.76 1.77 1.78 1.79 1.8 1.81 1.82 1.83 1.84 22.533.544.555.5 input voltage (v) output voltage (v) figure 5. output voltage vs. temp.; i out = 1ma figure 6. quiescent current vs. temperature 3.24 3.26 3.28 3.3 3.32 3.34 3.36 -45 -30 -15 0 15 30 45 60 75 90 temperature (c) output voltage (v) 80 100 120 140 160 180 200 220 240 -45 -30 -15 0 15 30 45 60 75 90 temperature (c) quiescent current (a) figure 7. startup; no load, no c ref figure 8. startup; r load = 11 , no c ref 50s/div v dd 1v/div 2v/div v out 50s/div v dd 1v/div 2v/div v out
www.ams.com/ldos/as1355 revision 1.3 6 - 12 as1355 datasheet - typical operating characteristics figure 9. startup; no load, c ref = 100nf figure 10. startup; r load = 11 , c ref = 100nf 2ms/div v dd 1v/div 2v/div v out 2ms/div v dd 1v/div 2v/div v out figure 11. startup; no load, c ref = 100nf (pre-charged) figure 12. startup; r load = 11 , c ref = 100nf (pre-charged) 20s/div e n 1v/div 2v/div v out 20s/div e n 1v/div 2v/div v out figure 13. load transient response; i out = 0 to 300ma figure 14. load transient response; i out = 300 to 0ma 10s/div i out 100ma/div 20mv/div v out 500s/div i out 100ma/div 20mv/div v out
www.ams.com/ldos/as1355 revision 1.3 7 - 12 as1355 datasheet - detailed description 8 detailed description figure 15. as1355 - block diagram thermal overcurrent softstart control thermal overcurrent softstart control reference voltage thermal overcurrent softstart control vdd1 vdd3 v ref v ref v ref en1 en2 en3 gnd ref vout1 vout2 vout3 as1355 vdd2 vdda
www.ams.com/ldos/as1355 revision 1.3 8 - 12 as1355 datasheet - typical application 9 typical application figure 16. typical application 1f 3.3v 1.8v 1.5v c ref = 100nf (improved noise performance) microprocessor as1355 vout1 1f vout2 1f vout3 vdd1 en1 en2 en3 gnd ref +5v 1f vdd2 vdd3 vdda
www.ams.com/ldos/as1355 revision 1.3 9 - 12 as1355 datasheet - package drawings and markings 10 package drawin gs and markings figure 17. 16-pin qfn 3x3 package marking: yywwizz. yy ww x zz last two digits of the current year manufacturing week plant identifier free choice / traceability code
www.ams.com/ldos/as1355 revision 1.3 10 - 12 as1355 datasheet - package drawings and markings figure 18. 16-pin tqfn 3x3 package
www.ams.com/ldos/as1355 revision 1.3 11 - 12 as1355 datasheet - ordering information 11 ordering information the devices are available as the standard products shown in table 4 . * these devices are available in factory-set output voltages from 1.25v to 3.6v in 100mv increments. choose the desired v out suffix from table 5 and insert it instead of ?xyz? in the part number. on request also non-standard devices with output voltages between 1.25v and 3.6v in 50mv steps are available. note: all products are rohs compliant and ams green. buy our products or get free samples online at www.ams.com/icdirect technical support is available at www.ams.com/technical-support for further information and requests, email us at sales@ams.com (or) find your local distributor at www.ams.com/distributor table 4. ordering information ordering code marking output description delivery form package AS1355-BQFT-WGD assg v out1 = 3.3v 300ma, triple ldo tape and reel 16-pin qfn 3x3 v out2 = 1.8v v out3 = 1.5v as1355-bqft-www assv v out1 = 3.3v 300ma, triple ldo tape and reel 16-pin qfn 3x3 v out2 = 3.3v v out3 = 3.3v as1355-bqft-wwd2 astd v out1 = 3.3v 300ma, triple ldo tape and reel 16-pin tqfn 3x3 v out2 = 3.3v v out3 = 1.5v as1355-bqft-xyz* ____ v out1 * 300ma, triple ldo tape and reel 16-pin qfn 3x3 v out2 * v out3 * table 5. output voltage suffix guide suffix min typ max suffix min typ max suffix min typ max a 1.25 j 2.1 s 3.0 b 1.3 k 2.2 t 3.1 c 1.4 l 2.3 v 3.2 d 1.5 m 2.4 w 3.3 e 1.6 n 2.5 x 3.4 f 1.7 o 2.6 y 3.5 g 1.8 p 2.7 z 3.6 h 1.9 q 2.8 2 thin qfn i 2.0 r 2.9
www.ams.com/ldos/as1355 revision 1.3 12 - 12 as1355 datasheet - ordering information copyrights copyright ? 1997-2013, ams ag, tobelbaderstrasse 30, 8141 unterpremstaetten, austria-europe. trademarks registered ?. all right s reserved. the material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written con sent of the copyright owner. all products and companies mentioned are trademarks or registered trademarks of their respective companies. disclaimer devices sold by ams ag are covered by the warranty and patent indemnification provisions appearing in its term of sale. ams ag makes no warranty, express, statutory, implied, or by description rega rding the information set forth herein or regarding the freedom of the described devices from patent infringement. ams ag reserves the right to change specifications and prices at any time and without notice. therefore, prior to designing this product into a system, it is necessary to check with ams ag for current information. this product is intended for use in normal commercial applications. applications requiring extended temperature range, unusual environmental requirements, or high reliabi lity applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without addi tional processing by ams ag for each application. for shipments of less than 100 parts the manufacturing flow might show deviations from the stan dard production flow, such as test flow or test location. the information furnished here by ams ag is believed to be correct and accurate. however, ams ag shall not be liable to recipien t or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruptio n of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, perfo rmance or use of the technical data herein. no obligation or liability to recipient or any third party shall arise or flow out of ams ag rendering of technical or other services. contact information headquarters ams ag tobelbaderstrasse 30 a-8141 unterpremstaetten, austria tel : +43 (0) 3136 500 0 fax : +43 (0) 3136 525 01 for sales offices, distributors and representatives, please visit: http://www.ams.com/contact

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