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austriamicrosystems ag is now ams ag the technical content of this austriamicrosystems datasheet is still valid. contact information: headquarters: ams ag tobelbaderstrasse 30 8141 unterpremstaetten, austria tel: +43 (0) 3136 500 0 e - mail: ams_sales @ams.com please visit our website at www.ams.com
as1353 , as1356 linear low-dropout 150ma voltage regulators www.austriamicrosystems.com revision 1.03 1 - 13 data sheet 1 general description the as1353/as1356 are high-performance, fixed-volt- age linear ldos designed for use with capacitors of 1 to 10f. the devices can deliver superior performance even under low dropout cond itions when the power tran- sistor operates in linear mode. the integrated p-channel mosfet output allows the devices to maintain a low supply-current at loads of up to150ma. a shutdown mode includes logic-controlled circuitry which reduces shut down current to less than 1a (max). integrated over-temperature and over-current protec- tion circuitry switches the devi ces off in case of thermal overload or output short-circuit conditions. the as1353/as1356 are optimized for low equivalent- series resistance (esr) output capacitors. additionally, all devices contain reversed battery protection which dis- connects the internal circuitry and parasitic diodes if the battery is connected incorrectly. the as1356 also features power-ok circuitry which can be used to monitor output regulation. all devices also feature an integrated error amplifier and built-in 1.25v reference, and output current is limited (380ma typ) via the on-chip current limiting circuitry. multiple output voltages are available as standard prod- ucts: 3.6, 3.3, 3.0, 2.7, 2.5, or 1.5v. all devices are avail- able in a 5-pin sot23 package. figure 1. pinout and application diagrams 2 key features ultra-low dropout voltage: 40mv @ 100ma load output voltage range: +1.5 to +3.6v (100mv steps) max output current: 150ma output voltage accuracy: 1% low shutdown current: 1a high psrr: 60db at 100hz integrated overtemperatur e/overcurrent protection reverse-battery protection (as1353/as1356) power-ok output (as1356) minimal external components required operating temperature range: -40 to +85c 5-pin sot23 package 3 applications the devices are ideal for powering cordless and mobile phones, mp3 players, cd and dvd players, pdas, handheld computers, digital cameras, and any other hand-held and/or battery-powered device. as1356 shdnm in out pok c in 1f +2.5 to +5.5v c out 1f 100k on off preset output 1.5 to 3.6v, 150ma to m i c r o - processor as1353 bp c bp 0.01f shdnm in out c in 1f +2.5 to +5.5v c out 1f on off preset output 1.5 to 3.6v, 150ma gnd as1353 3 bp 2 1 5 4 out gnd shdnm in gnd as1356 3 pok 2 1 5 4 out gnd shdnm in ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 2 - 13 as1353/as1356 data sheet - pinout 4 pinout pin assignments figure 2. pin assignments (top view) pin descriptions table 1. as1353 pin descriptions pin number pin name description 1in ldo input . supply voltage can range from 2.5 to 5.5v. bypass with a 1f capacitor to gnd (see capacitor selection and regulator stability on page 10). 2 gnd ground . this pin also functions as a heat sink. solder to a large pad or the circuit-board ground plane to maximize power dissipation. 3 shdnm active-low shutdown input . a logic low reduces the supply current to < 1a. note: connect to in for normal operation. 4 bp reference-noise bypass . bypass with a low-leakage, 0.01f ceramic capacitor for reduced noise at the output. 5 out ldo output . fixed 1.5, 2.5, 2.7, 3.0, 3.3, and 3.6v output. sources up to 150ma. table 2. as1356 pin descriptions pin number pin name description 1in ldo input . input voltage can range from 2.5 to 5.5v. bypass with 1f to gnd (see capacitor selection and regulator stability on page 10). 2gnd ground . this pin also functions as a heat sink. solder to a large pad or the circuit-board ground plane to maximize power dissipation. 3 shdnm active-low shutdown input . a logic low reduces the supply current to < 1a. note: connect to pin in for normal operation. 4pok power-ok output . active-low, open-drain output indicates an out-of-regulation condition. connect a 100k pull-up resistor to pi n out for logic levels. note: leave this pin unconnected if the power-ok feature is not used. 5out ldo output . fixed 1.5, 2.5, 2.7, 3.0, 3.3, and 3.6v output. sources up to 150ma. 3 pok 2 1 5 4 out gnd shdnm in 3 bp 2 1 5 4 out gnd shdnm in as1356 as1353 ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 3 - 13 as1353/as1356 data sheet - absolute maximum ratings 5 absolute maximum ratings stresses beyond those listed in table 3 may cause perm anent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond t hose indicated in section 6 electrical characteristics on page 4 is not implied. exposure to ab solute maximum rating conditions for extended periods may affect device reliability. table 3. absolute maximum ratings parameter min max typ units comments in, shdnm to gnd -7 +7 v shdnm to in -7 +0.3 v pok, bp, out to gnd -0.3 v in + +0.3 v output short-circuit duration indefinite v continuous power dissipation (t amb = +70oc) 571 mw derate 7.1mw/oc above +70oc operating temperature range -40 +85 oc junction temperature +150 oc internally limited ja +140 oc/w storage temperature range -65 +150 oc package body temperature +260 oc the reflow peak soldering temperature (body temperature) specified is in accordance with ipc/jedec j-std-020c ?moisture/reflow sensitivity classification for non-hermetic solid state surface mount devices? ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 4 - 13 as1353/as1356 data sheet - electrical characteristics 6 electrical characteristics (v in = v out(nominal) + 1v, shdnm = in, t amb = -40 to +85oc (unless otherwise specified). typical values are at t amb = +25oc. limits are 100% production tested at t amb = +25oc. table 4. electrical characteristics symbol parameter conditions min typ max unit v in input voltage 2.5 5.5 v output voltage accuracy t amb = +25oc, i out = 100a -1 1 % t amb = -40 to +85oc, i out = 100a to 150ma -3 3 i out maximum output current 150 ma i lim current limit 160 380 ma i q ground pin current i out = 100a 70 180 a i out = 150ma 115 v in -v out dropout voltage 1 i out = 100a 0.05 mv i out = 50ma 20 i out = 100ma 40 100 i out = 150ma 60 v lnr line regulation v in = 2.5v or (v out + 0.1) to 4.5v, i out = 1ma -0.2 0 0.2 %/v v in = 2.5v or (v out + 0.1) to 5.5v, i out = 1ma -0.8 0 0.8 v ldr load regulation i out = 100a to 150ma, c out = 1f 0.001 0.02 %/ma en output voltage noise c out = 1f, f = 10hz to 100khz, c bp = 0.01f as1353 30 v rms c out = 1f, f = 10hz to 100khz as1356 110 psrr output voltage ac power-supply rejection ratio f = 100hz, c out = 1f, (c bp = 0.01f, as1353) 60 db shutdown 2 t on exit delay from shutdown 3 , 4 c bp = 0.01f, no load (as1353) 30 150 s i off shutdown supply current shdnm = gnd t amb = +25oc 0.01 1 a t amb = +85oc 0.04 v ih shdnm input threshold v in = 2.5 to 5.5v 2.0 v v il 0.4 i shdnm shdnm input bias current shdnm = in or gnd t amb = +25oc 0.03 100 na t amb = +85oc 0.2 power-ok output (as1356 only) v pok power-ok voltage threshold i out = 0, v outfalling 92 95 97 % v out hysteresis, i out = 0 1 v ol pok output voltage low i sink = 1ma 0.4 v pok output leakage current 0 v pok 5.5v, v out in regulation 1 a thermal protection t shdnm thermal shutdown temperature as1353 150 oc as1356 165 t shdnm thermal shutdown hysteresis as1353 15 oc as1356 20 oc ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 5 - 13 as1353/as1356 data sheet - electrical characteristics 1. dropout voltage = v in - v out when v out is 100mv < v out for v in = v out +0.5v (applies only to output voltages 2.5v). 2. the rise and fall time of the shutdown signal must not exceed 1ms. 3. the delay time is defined as time required to set v out to 95% of its final value. 4. guaranteed by design. ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 6 - 13 as1353/as1356 data sheet - typical operating characteristics 7 typical operating characteristics v out = +3.0v , v in = +3.6v, c in = c out = 1f, shdnm = in, t amb = +25oc (unless otherwise specified) figure 3. ground pin current vs. input voltage f igure 4. ground pin current vs. output load figure 5. ground pin current vs. temperature f igure 6. output voltage vs. input voltage figure 7. output voltage vs. output load figure 8. output vo ltage vs. temperature 0 20 40 60 80 100 120 140 0123456 input voltage (v) ground pin current (a) . 60 70 80 90 100 110 120 0 25 50 75 100 125 150 output load (ma) ground pin current (a) . i out = 0ma i out = 150ma v in = 3.5v v in = 5v 60 70 80 90 100 110 120 130 -40-200 20406080100 temperature (c) ground pin current (a) . v in = 3.6v, i out = 150ma v in = 5v, i out = 150ma v in = 3.6v, i out = 0ma v in = 5v, i out = 0ma 0 0.5 1 1.5 2 2.5 3 3.5 0123456 input voltage (v) output voltage (v) . i out = 0ma i out = 150ma 2.9 2.95 3 3.05 3.1 0 25 50 75 100 125 150 output load (ma) output voltage (v) . v in = 5v v in = 3.6v 2.98 2.99 3 3.01 3.02 3.03 3.04 -40 -20 0 20 40 60 80 100 temperature (c) output voltage (v) . v in = 5v, i out = 150ma v in = 3.6v, i out = 0ma v in = 3.6v, i out = 0ma v in = 3.6v, i out = 150ma ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 7 - 13 as1353/as1356 data sheet - typical operating characteristics figure 9. dropout voltage vs. output load figure 10. psrr vs. frequency figure 11. line transient response; i out = 50ma 0 25 50 75 100 125 150 0 25 50 75 100 125 150 output load (ma) dropout voltage (v) . -45c +85c +25c 0 10 20 30 40 50 60 70 80 10 100 1000 10000 100000 frequency (hz) psrr (db) . 10ms/div v in 20mv/div 4v 5v v out ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 8 - 13 as1353/as1356 data sheet - detailed description 8 detailed description the as1353/as1356 are low-dropout, low- quiescent-current linear regulators in tended for ldo regulator applications where output current load requirements rang e from no load to 150ma. all devices co me standard with fixed output volt- ages of 1.5 to 3.6v (see ordering information on page 12) . figure 12. block diagram as illustrated in figure 12, the devices comprise a 1.25v re ference, error amplifier, p-channel mosfet pass transis- tor, power-ok comparator, internal feedback voltage divider, current limiter, reverse-battery protection, thermal sensor and shutdown logic. the 1.25v bandgap reference is connected to the inverting input of the error amplifier. the error amplifier compares this reference with the feedback voltage and amplifies the difference. if the feedback voltage is lower than the refer- ence voltage, the p-channel mosfet gate is pulled lower, allowing more current to pass to the output, and increases the output voltage. if the feedback voltage is too high, the pass-transistor gate is pulled up, allowing less current to pass to the output. the output voltage feeds back through an internal resistor voltage divider connected to pin out. output voltages standard products are factory-set with out put voltages of from 1.5 to 3.6v. a two- digit suffix of the part number identi- fies the nominal output voltage (see ordering information on page 12). non-standard devices are avail able. contact austriamicrosystem s ag for more information. internal p-channel mo sfet pass transistor the integrated 0.5 (typ) p-channel mosfet pass transistor requires no base drive, which reduces quiescent current significantly, and does not exhibit the pr oblems associated with pnp-based regulat ors, such as dropout when the pass transistor saturates or high base-drive currents under large load conditions. the devices consume only 115a quiescent current in dropou t, light-load, or heavy-load applications (see typical operating characteristics on page 6). power-ok the as1356?s power-ok circuitry is built around an n-ch annel mosfet. the circuitry monitors the voltage on pin 5 (out) and if the voltage goes out of regulation (e.g. durin g dropout, current limit, or t hermal shutdown) pin pok goes low. shdnm as1353/as1356 in + ? gnd reverse- battery protection out + - pok 2 error amplifier thermal overload protection bandgap voltage & current reference 95% shutdown/ power-on control logic trimmable reference voltage r 2 r 1 bp 1 1 as1353 only 2 as1356 only as1356 only ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 9 - 13 as1353/as1356 data sheet - detailed description the power-ok feature is not active during shutdown and provides a power-on-reset (por) function that can operate down to v in = 1v. a capacitor to gnd may be added to generate a por delay. to obtain a logic-level output, connect a pull-up resistor from pin pok to pin out. larger values for this resistor will help minimize current consumption; a 100k resistor is perfect for most applications (see figure 13). reverse-battery protection the as1353/as1356 contain integrated reverse-battery protection circuitry which monitors the polarity of pins in and shdnm and disconnects the internal circuitry and parasitic di odes if the battery is connected incorrectly. reverse sup- ply current is limited to 1ma if v in = v shdnm falls below ground. load current is also limited when v in or v shdnm are reverse biased with respect to ground. current limiting the as1353/as1356 include current limiting circuitry to protec t against short-circuit conditions. the circuitry monitors and controls the gate voltage of the p-channel mosfet, limiting the output cu rrent to 380ma (typ). the p-channel mosfet output can be shorted to ground for an indefi nite period of time without damaging the device. noise reduction the as1353 uses an external 0.01f bypass capacitor (c bp ) at pin bp to reduce output noise. an internal pre-charge circuit is used to reduce start-up time. the use of c bp > 0.01f improves noise performanc es but increases start-up time. thermal-overload protection the devices are protected against thermal runaway conditions by the integrated thermal sensor circuitry. thermal shutdown is an effective means to prevent die overheating since the power transistor is the principle heat source in the device. if the junction temperature exceeds 165oc (typ, as1356) or 150oc (typ, as1353), the thermal sensor starts the shut- down logic, at which point the p-channel mosfet is swit ched off. after the device temperature has dropped by approximately 20oc, the thermal sensor wil l turn the p-channel mosfet on again. no te that this will be exhibited as a pulsed output under continuous thermal-overload conditions. note: the absolute maximum junction-temperature rating of + 150oc should not be exceeding during continual oper- ation. operating region and power dissipation maximum power dissipation is determined by the thermal resi stance of the case and circuit board, the temperature dif- ference between the die junction and ambient air, and the rate of air flow. the power dissipation of the device is calcu- lated by: p = i out (v in - v out )( e q 1 ) maximum power dissipation is calculated by: p max = (t j - t amb ) / ( jb + ja )( e q 2 ) where: t j - t amb is the temperature difference between the device die junction and the surrounding air. jb or jc is the thermal resistance of the package. ja is the thermal resistance through the printed circuit b oard, copper traces, and other materials to the surrounding air. note: pin gnd is a multi-function pin providing a connection to the system ground and acting as a heat sink. this pin should be connected to the system ground using a large pad or ground plane. ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 10 - 13 as1353/as1356 data sheet - typical application 9 typical application figure 13. typical application diagrams capacitor selection an d regulator stability ceramic capacitors are highly recommended as they offer di stinct advantages over their tantalum and aluminum elec- trolytic components. for stable operation with load currents up to 150ma over the entire device temperat ure range, use a 1f (min) ceramic output capaci tor with an esr <0.2 . use large output capacitor values (10f max) to reduce noise and improve load transient-response, stability and power-supply rejection. note: some ceramic capacitors exhibit large capacitance and esr variations with variations in temperature. z5u and y5v capacitors may be required to ensure stability at temperatures below t amb = -10oc. with x7r or x5r capacitors, a 1f capa citor should be sufficient at all operating temperatures. power supply rejection ratio the as1353/as1356 are designed to deliver low dropout volta ges and low quiescent currents. power-supply rejection is 60db (typ) at low frequencies. to improve power supply-noise rejection and transient response, increase the values of the input and output bypa ss capacitors (see figure 13). the typical operating characteristics (page 6) show th e device line- and load-transi ent responses. see the power- supply rejection ratio vs. frequency graph in the typica l operating characteristics section (page 6) for further details. dropout voltage for standard products with output vo ltage greater than the minimum v in (2.5v), the minimum input-output voltage dif- ferential (dropout voltage) determines the lowest usable supply voltage. this determines th e useful end-of -life battery voltage in battery-powered systems. the dropout voltage is a function of the p-mosfet drain-to-source on-resistance multiplied by the load current, and is calculated by: v dropout = v in - v out = r ds(on) x i out (eq 3) where: r ds(on) is the drain-to-source on-resistance. i out is the supply current. see typical operating characteristics (page 6) for further information. as1356 shdnm in out pok c in 1f +2.5 to +5.5v c out 1f 100k on off preset output 1.5 to 3.6v, 150ma to m i c r o- processor as1353 bp c bp 0.01f shdnm in out c in 1f +2.5 to +5.5v c out 1f on off preset output 1.5 to 3.6v, 150ma gnd gnd ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 11 - 13 as1353/as1356 data sheet - package drawings and markings 10 package drawings and markings the as1353/as1356 are available in a 5-pin sot23 package. figure 14. 5-pin sot23 package symbol min max a0.901.45 a1 0.00 0.15 a2 0.90 1.30 b0.300.50 c0.090.20 d2.803.05 e2.603.00 e1 1.50 1.75 l0.300.55 e 0.95 ref e1 1.90 ref 0o 8o notes: 1. all dimensions in millimeters. 2. foot length measured at intercept point between datum a and lead surface. 3. package outline exclusive of mold flash and metal burr. 4. package outline inclusive of solder plating. 5. complies with eiaj sc74. 6. pkg st 0003 rev a supersedes sot23-d-2005 rev c. ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 12 - 13 as1353/as1356 data sheet - ordering information 11 ordering information the devices are available as the following standard products. non-standard versions are available with a minimum order of 30,000 units. contac t austriamicrosystems for availability of non-standard versions. type marking description delivery form package as1353-15-t asd8 ldo 150ma, reverse-battery protection, 1.5v tape and reel 5-pin sot23 as1353-18-t asd9 ldo 150ma, reverse-battery protection, 1.8v tape and reel 5-pin sot23 as1353-26-t ashb ldo 150ma, reverse-battery protection, 2.6v tape and reel 5-pin sot23 as1353-28-t ashc ldo 150ma, reverse-battery protection, 2.8v tape and reel 5-pin sot23 as1353-30-t ashd ldo 150ma, reverse-battery protection, 3.0v tape and reel 5-pin sot23 as1353-33-t ashe ldo 150ma, reverse-battery protection, 3.3v tape and reel 5-pin sot23 as1353-36-t asi8 ldo 150ma, reverse-battery protection, 3.6v tape and reel 5-pin sot23 AS1356-27-T ashm ldo 150ma, reverse-ba ttery protection,with power-ok, 2.7v tape and reel 5-pin sot23 as1356-33-t asho ldo 150ma, reverse-ba ttery protection,with power-ok, 3.3v tape and reel 5-pin sot23 ams ag technical content still valid
www.austriamicrosystems.com revision 1.03 13 - 13 as1353/as1356 data sheet copyrights copyright ? 1997-200 7, austriamicrosystems ag, schloss premstaett en, 8141 unterpremstae tten, austria-europe. trademarks registered ?. all rights reserved. the materi al herein may not be reproduced, adapted, merged, trans- lated, stored, or used witho ut the prior written consent of the copyright owner. all products and companies mentioned are trademarks or registered trademarks of their respective companies. disclaimer devices sold by austriamicrosystems ag are covered by t he warranty and patent indemni fication provisions appearing in its term of sale. austriamicrosystems ag makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriami- crosystems ag reserves the right to change specifications and prices at any ti me and without notice . therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems ag for current information. this product is intended for use in normal commercial a pplications. applications requiring extended temperature range, unusual environmental requirements, or high reliability app lications, such as military, medical life-support or life- sustaining equipment are specifically not recommended wit hout additional processing by austriamicrosystems ag for each application. for shipments of less than 100 parts the m anufacturing flow might show deviations from the standard production flow, such as test flow or test location. the information furnished here by austriamicrosystems ag is believed to be correct and accurate. however, austriamicrosystems ag shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or ar ising out of the furnishing, performance or use of the tech- nical data herein. no obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems ag rendering of technical or other services. contact information headquarters austriamicrosystems ag a-8141 schloss premstaetten, austria tel: +43 (0) 3136 500 0 fax: +43 (0) 3136 525 01 for sales offices, distributors and representatives, please visit: http://www.austriamicrosystems.com/contact ams ag technical content still valid

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