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AS1310 ultra low quiescent current, hyst eretic dc-dc step-up converter www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 1 - 15 datasheet 1 general description the AS1310 is an ultra low i q hysteretic step-up dc-dc converter optimized for light loads (60ma), where it achieves efficiencies of up to 92%. AS1310 operates from a 0.7v to 3.6v supply and supports output voltages between 1.8v and 3.3v. besides the available AS1310 standard variants any variant with output voltages in 50mv steps are available. see ordering information on page 14 for more information. if the input voltage exceeds the output voltage the device is in a feed-through mode and the input is directly connected to the output voltage. in order to save power the AS1310 features a shutdown mode, where it draws less than 100na. during shutdown mode the battery is disconnected from the output. the AS1310 also offers adjustable low battery detection. if the bat - tery voltage decreases below the threshold defined by two external resistors on pin lbi, the lbo output is pulled to logic low. the AS1310 is available in a tdfn (2x2) 8-pin package. 2 key features input voltage range: 0.7v to 3.6v fixed output voltage range: 1.8v to 3.3v output current: 60ma @ v in =0.9v, v out =1.8v quiescent current: 1a (typ.) shutdown current: < 100na up to 92% efficiency output disconnect in shutdown feedthrough mode when v in > v out adjustable low battery detection no external diode or transistor required over temperature protection tdfn (2x2) 8-pin package 3 applications the AS1310 is an ideal solution for single and dual cell powered devices as blood glucose meters, remote controls, hearing aids, wireless mouse or any light-load application. figure 1. AS1310 - typical application diagram v in 0.7v to 3.6v AS1310 c 2 22f on off c 1 22f gnd 2 v out 1.8v to 3.3v 7 en 8 vin 4 vout 6 lbo 1 lbi r 3 low battery detect r 1 r 2 l1 6.8h lx 3 c ref 100nf 5 ref
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 2 - 15 AS1310 datasheet - pin assignments 4 pin assignments figure 2. pin assignments (top view) pin descriptions table 1. pin descriptions pin number pin name description 1 lbi low battery comparator input . 0.6v threshold. may not be left floating. if connected to gnd, lbo is working as power output ok. 2 gnd ground 3 lx external inductor connector. 4vout output voltage. decouple vout with a 22f ceramic capacitor as close as possible to vout and gnd. 5 ref reference pin. connect a 100nf ceramic capacitor to this pin. 6lbo low battery comparator output . open-drain output. 7en enable pin . logic controlled shutdown input. 1 = normal operation; 0 = shutdown; shutdown current <100na. 8 vin battery voltage input. decouple vin with a 22f ceramic capacitor as close as possible to vin and gnd. 9 nc exposed pad. this pad is not connected internally. can be left floating or connect to gnd to achieve an optimal thermal performance. AS1310 gnd 2 vout 4 lbi 1 lx 3 ref 5 lbo 6 en 7 vin 8 9
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 3 - 15 AS1310 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 electrical characteristics on page 4 is not implied. 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 vin, vout, en, lbi, lbo to gnd -0.3 +5 v lx, ref to gnd -0.3 v out + 0.3 v input current (latch-up immunity) -100 100 ma norm: jedec 78 electrostatic discharge electrostatic discharge hbm +/- 2 kv norm: mil 883 e method 3015 temperature ranges and storage conditions thermal resistance ja +33 oc/w junction temperature +150 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?. the lead finish for pb-free leaded packages is matte tin (100% sn). humidity non-condensing 5 85 % moisture sensitive level 1 represents a max. floor life time of unlimited
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 4 - 15 AS1310 datasheet - electrical characteristics 6 electrical characteristics v in = 1.5v, c1 = c2 = 22f, c ref = 100nf, t amb = -40c to +85oc. typical values are at t amb = +25oc. unless otherwise specified. table 3. electrical characteristics symbol parameter conditions min typ max units t amb operating temperature range -40 85 c input v in input voltage range 0.7 3.6 v minimum startup voltage i load = 1ma, t amb = +25c 0.7 0.8 v regulation v out output voltage range 1.8 3.3 v output voltage tolerance i load = 10 ma, t amb = +25c -2 +2 % i load = 10ma -3 +3 % v out lockout threshold 1 rising edge 1.55 1.65 1.75 v operating current i q quiescent current v in v out = 1.02xv outnom , ref = 0.99xv outnom , t amb = +25c 100 na quiescent current v out v out = 1.02xv on , ref = 0.99xv on , no load, t amb = +25c 0.8 1 1.2 a i shdn shutdown current t amb = +25oc 100 na switches r on nmos v out = 3v 0.35 pmos v out = 3v 0.5 nmos maximum on-time 3.6 4.2 4.8 s i peak peak current limit 320 400 480 ma zero crossing current 52035ma enable, reference v enh en input voltage high 0.7 v v enl en input voltage low 0.1 v i en en input biascurrent en = 3.6v, t amb = +25c 100 na i ref ref input biascurrent ref = 0.99xv outnom , t amb = +25c 100 na low battery & power-ok v lbi lbi threshold falling edge 0.57 0.6 0.63 v lbi hysteresis 25 mv i lbi lbi leakage current lbi = 3.6v, t amb = +25c 100 na v lbo lbo voltage low 2 i lbo = 1ma 20 100 mv i lbo lbo leakage current lbo = 3.6v, t amb = +25c 100 na power-ok threshold lbi = 0v, falling edge 90 92.5 95 %
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 5 - 15 AS1310 datasheet - electrical characteristics note: all limits are guaranteed. the parameters with min and max values are guaranteed with production tests or sqc (statistical qual ity control) methods. thermal protection thermal shutdown 10c hysteresis 150 c 1. the regulator is in startup mode until this voltage is reached . caution: do not apply full load current until the device outp ut > 1.75v 2. lbo goes low in startup mode as well as during normal operation if: 1) the voltage at the lbi pin is below lbi threshold. 2) the voltage at the lbi pin is below 0.1v and v out is below 92.5% of its nominal value. table 3. electrical characteristics symbol parameter conditions min typ max units
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 6 - 15 AS1310 datasheet - typical operating characteristics 7 typical operating characteristics t amb = +25c, unless otherwise specified. figure 3. efficiency vs. output current; v out = 1.8v figure 4. efficiency vs. output current; v out = 1.8v 40 45 50 55 60 65 70 75 80 85 90 0.01 0.1 1 10 100 1000 output current (m a) efficiency (%) vin = 0.9v vin = 1.2v v in = 1.5v l1: xpl2010-682m 40 45 50 55 60 65 70 75 80 85 90 0.01 0.1 1 10 100 1000 output current (m a) efficiency (%) vin = 0.9v vin = 1.2v v in = 1.5v l1: xpl7030-682m figure 5. efficiency vs. output current; v out = 3.0v figure 6. efficiency vs. output current; v out = 3.0v 40 45 50 55 60 65 70 75 80 85 90 95 100 0.01 0.1 1 10 100 1000 output current (m a) efficiency (%) vin = 0.9v vin = 1.2v v in = 1.5v vin = 1.8v vin = 2.4v l1: xpl2010-682m 40 45 50 55 60 65 70 75 80 85 90 95 100 0.01 0.1 1 10 100 1000 output current (ma) efficiency (%) vin = 0.9v vin = 1.2v v in = 1.5v vin = 1.8v vin = 2.4v l1: xpl7030-682m figure 7. efficiency vs. input voltage; v out = 1.8v figure 8. maximum output current vs. input voltage 50 55 60 65 70 75 80 85 90 95 100 0.7 0.9 1.1 1.3 1.5 1.7 1.9 input voltage (v) efficiency (%) io ut = 1ma io ut =10ma io ut =50 ma l1: xpl2010-682m 0 20 40 60 80 100 120 140 160 180 0 0.5 1 1.5 2 2.5 3 input voltage (v) output current (ma) . vout = 1.8v vout = 3.0v
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 7 - 15 AS1310 datasheet - typical operating characteristics figure 9. start-up voltage vs. output current figure 10. r on vs. temperature 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1 012345678910 output current (m a) start-up voltage (v) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -40 -15 10 35 60 85 temperature (c) r on ( ) pm os nm os figure 11. output voltage ripple; v in = 2v, v out = 3v, r load = 100 5s/div i lx 200ma/div 2v/div 100mv/div v lx v out (ac)
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 8 - 15 AS1310 datasheet - detailed description 8 detailed description the AS1310 is available with fixed output voltages from 1.8v to 3.3v in 50mv steps. figure 12. AS1310 - block diagram AS1310 features shutdown the part is in shutdown mode while the voltage at pin en is below 0.1v and is active when the voltage is higher than 0.7v. note: en can be driven above v in or v out , as long as it is limited to less than 3.6v. output disconnect and inrush limiting during shutdown v out is going to 0v and no current from the input source is running through the device. this is true as long as the input voltage is higher than the output voltage. feedthrough mode if the input voltage is higher than the output voltage the supply voltage is connected to the load through the device. to guara ntee a proper func - tion of the AS1310 it is not allowed that the supply exceeds the maximum allowed input voltage (3.6v). in this feedtrough mode the quiescent current is 35a (typ.). the device goes back into step-up mode when the oputput voltage i s 4% (typ.) below v outnom . zero crossing detector AS1310 driver and control logic startup circuitry 6.8h 0.7 to 3.6v input imax detection c in 22f + ? 1.8v to 3.3v output c out 22f lx en vout gnd v ref ref lbo r 3 vin lbi c ref 100nf
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 9 - 15 AS1310 datasheet - detailed description power-ok and low-battery-detect functionality lbo goes low in startup mode as well as during normal operation if: - the voltage at the lbi pin is below lbi threshold (0.6v). this can be used to monitor the battery voltage. - lbi pin is connected to gnd and v out is below 92.5% of its nominal value. lbo works as a power-ok signal in this case. the lbi pin can be connected to a resistive-divider to monitor a particular definable voltage and compare it with a 0.6v intern al reference. if lbi is connected to gnd an internal resistive-divider is activated and connected to the output. therefore, the power-ok functionali ty can be realised with no additional external components. the power-ok feature is not active during shutdown and provides a power-on-reset function that can operate down to v in = 0.7v. a capacitor to gnd may be added to generate a power-on-reset delay. to obtain a logic-level output, connect a pull-up resistor r 3 from pin lbo to pin v out . larger values for this resistor will help to minimize current consumption; a 100k resistor is perfect for most applications (see figure 14 on page 10) . for the circuit shown in the left of figure 13 , the input bias current into lbi is very low, permitting large-value resistor-divider networks while maintaining accuracy. place the resistor-divider network as close to the device as possible. use a defined resistor for r 2 and then calculate r 1 as: where: v lbi is 0.6v. figure 13. typical application with adjustable battery monitoring (eq 1) r 1 r 2 v in v lbi ----------- 1 ? ?? ?? ? = v in 0.7v to 3.6v AS1310 c 2 22f on off c 1 22f gnd 2 v out 1.8v to 3.3v 7 en 8 vin 4 vout 6 lbo 1 lbi r 3 low battery detect r 1 r 2 l1 6.8h lx 3 c ref 100nf 5 ref
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 10 - 15 AS1310 datasheet - detailed description figure 14. typical application with lbo working as power-ok thermal shutdown to prevent the AS1310 from short-term misuse and overload conditions the chip includes a thermal overload protection. to block the normal operation mode all switches will be turned off. the device is in thermal shutdown when the junction temperature exceeds 150c. to resume the normal operation the temperature has to drop below 140c. a good thermal path has to be provided to dissipate the heat generated within the package. otherwise it?s not possible to opera te the AS1310 at its useable maximal power. to dissipate as much heat as possible from the package into a copper plane with as much area as poss ible, it?s rec - ommended to use multiple vias in the printed circuit board. it?s also recommended to solder the exposed pad (pin 9) to the gnd plane. note: continuing operation in thermal overload conditions may damage the device and is considered bad practice. v in 0.7v to 3.6v AS1310 c 2 22f on off c 1 22f gnd 2 v out 1.8v to 3.3v 7 en 8 vin 4 vout 6 lbo 1 lbi r 3 low battery detect l1 6.8h lx 3 c ref 100nf 5 ref
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 11 - 15 AS1310 datasheet - application information 9 application information component selection only four components are required to complete the design of the step-up converter. the low peak currents of the AS1310 allow th e use of low value, low profile inductors and tiny external ceramic capacitors. inductor selection for best efficiency, choose an inductor with high frequency core material, such as ferrite, to reduce core losses. the inductor should have low dcr (dc resistance) to reduce the i2r losses, and must be able to handle the peak inductor current without saturating. a 6.8h inductor with a >500ma current rating and <500m dcr is recommended. capacitor selection the convertor requires three capacitors. ceramic x5r or x7r types will minimize esl and esr while maintaining capacitance at ra ted voltage over temperature. the v in capacitor should be 22f. the v out capacitor should be between 22f and 47f. a larger output capacitor should be used if lower peak to peak output voltage ripple is desired. a larger output capacitor will also improve load regulation on v out . see table 5 for a list of capacitors for input and output capacitor selection. on the pin ref a 10nf capacitor with an insulation resistance >1g is recommended. table 4. recommended inductors part number l dcr current rating dimensions (l/w/t) manufacturer xpl2010-682m 6.8h 421m 0.62a 2.0x1.9x1.0mm coilcraft www.coilcraft.com epl2014-682m 6.8h 287m 0.59a 2.0x2.0x1.4mm lps3015-682m 6.8h 300m 0.86a 3.0x3.0x1.5mm lps3314-682m 6.8h 240m 0.9a 3.3x3.3x1.3mm lps4018-682m 6.8h 150m 1.3a 3.9x3.9x1.7mm xpl7030-682m 6.8h 59m 9.4a 7.0x7.0x3.0mm lqh32cn6r8m53l 6.8h 250m 0.54a 3.2x2.5x1.55mm murata www.murata.com lqh3npn6r8nj0l 6.8h 210m 0.7a 3.0x3.0x1.1mm lqh44pn6r8mj0l 6.8h 143m 0.72a 4.0x4.0x1.1mm table 5. recommended input and output capacitors part number c tc code rated voltage dimensions (l/w/t) manufacturer grm21br60j226me99 22f x5r 6.3v 0805, t=1.25mm murata www.murata.com grm31cr61c226ke15 22f x5r 16v 1206, t=1.6mm grm31cr60j475ka01 47f x5r 6.3v 1206, t=1.6mm table 6. recommended capacitors for ref part number c tc code insulation resistance rated voltage dimensions (l/w/t) manufacturer grm188r71c104ka01 100nf x7r >5g 16v 0603, t=0.8mm murata www.murata.com grm31cr61c226ke15 100nf x7r >5g 50v 0805, t=1.25mm
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 12 - 15 AS1310 datasheet - package drawings and markings 10 package drawin gs and markings figure 15. tdfn (2x2) 8-pin marking package code: xxx - encoded datecode
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 13 - 15 AS1310 datasheet - package drawings and markings figure 16. tdfn (2x2) 8-pin package diagram
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 14 - 15 AS1310 datasheet - ordering information 11 ordering information the device is available as the standard products shown in table 7 . note: all products are rohs compliant and austriamicrosystems green. buy our products or get free samples online at icdirect: http://www.austriamicr osystems.com/icdirect technical support is found at http://www.austriamicrosystems.com/technical-support for further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicros ystems.com/distributor table 7. ordering information ordering code marking output description delivery form package AS1310-btdt-18 a2 1.8v ultra low quiescent current, hysteretic dc-dc step-up converter tape and reel tdfn (2x2) 8-pin AS1310-btdt-20 a8 2.0v ultra low quiescent current, hysteretic dc-dc step-up converter tape and reel tdfn (2x2) 8-pin AS1310-btdt-25 a9 2.5v ultra low quiescent current, hysteretic dc-dc step-up converter tape and reel tdfn (2x2) 8-pin AS1310-btdt-27 a7 2.7v ultra low quiescent current, hysteretic dc-dc step-up converter tape and reel tdfn (2x2) 8-pin AS1310-btdt-30 a6 3.0v ultra low quiescent current, hysteretic dc-dc step-up converter tape and reel tdfn (2x2) 8-pin AS1310-btdt-33 1 1. on request tbd 3.3v ultra low quiescent current, hysteretic dc-dc step-up converter tape and reel tdfn (2x2) 8-pin AS1310-btdt-xx 2 2. non-standard devices are available between 1.8v and 3.3v in 50mv steps. tbd tbd ultra low quiescent current, hysteretic dc-dc step-up converter tape and reel tdfn (2x2) 8-pin
www.austriamicrosystems.com/dc-dc_step-up/AS1310 revision 1.04 15 - 15 AS1310 datasheet copyrights copyright ? 1997-2011, austriamicrosystems ag, tobelbaderstrasse 30, 8141 unterpremstaetten, austria-europe. trademarks registe red ?. all rights reserved. the material herein may not be reproduced, adapted, merged, translated, stored, or used without 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 the warranty and patent indemnification provisions appearing in its term of sale. austri - amicrosystems ag makes no warranty, express, statutory, implied, or by description regarding the information set forth herein o r regarding the freedom of the described devices from patent infringement. austria microsystems ag reserves the right to change specifications a nd prices at any time and without notice. therefore, prior to designing this product into a system, it is necessary to check with austriamic rosystems ag for current information. this product is intended for use in normal commercial applications. applications requiring extended temper ature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specif - ically not recommended without additional processing by austriamicrosystems ag for each application. for shipments of less than 100 parts the manufacturing 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 arising out of the furnishing, performance or use of the technical 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 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.austriamicrosystems.com/contact

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