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as1301 5v/50ma low noise inductorless boost converter data sheet www.austriamicrosystems.com revision 1.03 1 - 16 1 general description the as1301 is a 50ma inductorless boost converter using a double h-bridge charge-pump topology with two external flying capacitors. the as1301 runs on a 1mhz fixed frequency and is utilized with a low noise regulation scheme to allow usage together with sensitive rf circuitry from the same battery supply. designed to reside in portable and space limited equipment the 1mhz charge pump converts a 2.7 to 5.25v input to regulated 5v output with 5% accuracy. the shutdown function reduces the supply current to <5a and disconnects the load from the output. the integrated soft-start circuitry prevents current spikes being drawn from the battery during start-up. the as1301 is av ailable in tdfn (3x3x0.8mm) 10-pin and wl-csp 8-bumps packages. 2 key features up to 92% efficiency 2.7 to 5.25v input voltage regulated 5v output automatic mode up-switching <5a shutdown current 5v tolerant enable signal up to 50ma load current overload protection output disconnected during shutdown soft-start no inductor required small external components required (c out 2.2f, c fly 220nf) low noise fixed frequency 1mhz charge pump: - 1:1 battery feed through mode - 2:3 single phase mode - 1:2 dual phase mode package options: - tdfn (3x3x0.8mm) 10-pin - wl-csp 8-bumps with 0.5mm pitch 3 applications the device is ideal for two or three aa cells or a single li-ion battery cell to 5v conversion, mobile phones, portable instruments, mi croprocessor based systems and remote data-a cquisition systems. figure 1. typical application diagram + v batt c bat as1301 2.2f vbatt en gnd vout c1+ c1- c2+ c2- v out = 5v c out 2.2f on off c fly1 c fly2
www.austriamicrosystems.com revision 1.03 2 - 16 as1301 data sheet - pin assignments 4 pin assignments figure 2. pin assignments (through view) pin descriptions table 1. pin descriptions pin name tdfn pinout wlp pinout description c2+ 1 d1 connector 2+. positive terminal of flying cap 2. vout 2 b1 +5v output voltage. this pin must be bypassed with a 2.2f low esr ceramic capacitor. nc 3 - connected to gnd or left floating. nc 4 - connected to gnd or left floating. nc 5 - connected to gnd or left floating. en 6 a1 enable. (operating if en = 1). set this digital input to logic high for normal operation. for shutdown, set to logic low. c1+ 7 c1 connector 1+. positive terminal of flying cap 1. c2- 8 c2 connector 2-. negative terminal of flying cap 2. vbatt 9 b2 +2.7v to 5.25v input voltage. bypass this pin to gnd with a 2.2f low esr ceramic capacitor. c1- 10 d2 connector 1-. negative terminal of flying cap 1. gnd exposed pad a2 ground. 1 c2+ 2 vout 3 nc 4 nc 5 nc 10 c1- 9 vbatt 8 c2- 7 c1+ 6 en a1 b1 c1 d1 d2 c2 b2 a2 en vout c1+ c2+ c2- c1- vbatt gnd wl-csp 8-bumps tdfn (3x3x0.8mm) 10-pin gnd
www.austriamicrosystems.com revision 1.03 3 - 16 as1301 data sheet - 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 de vice at these or any other cond itions beyond those indicated in section 6 electrical characteristics on page 4 is not implied. exposure to absolute maxi mum rating conditions for extended periods may affect device reliability. table 2. absolute maximum ratings parameter min max units notes all pins to gnd -0.3 +7.0 v operating temperature range -40 +85 oc storage temperature range -65 +125 oc esd 2 kv hbm mil-std. 883e 3015.7 methods 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?. the lead finish for pb-free leaded packages is matte tin (100% sn).
www.austriamicrosystems.com revision 1.03 4 - 16 as1301 data sheet - electrical characteristics 6 electrical characteristics v in = 2.7 to 5.25v, v out = 5v, c out = c bat = 2.2f, c fly1 = c fly2 =220nf, t amb = -40 to +85oc. typical values are at t amb = +25oc, unless otherwise specified. table 3. electrical characteristics symbol parameter conditions min typ max units v on startup voltage, rising v batt 2.8 2.865 v v off startup voltage, falling v batt 2.505 2.7 2.8 v v batt battery supply voltage v on / v off 3.6 5.25 v v out settled average output voltage 4.75 5.0 5.25 v i out load current 1 1. the device is tested in a proprietary test mode. after startup of 1ms 0 50 ma v ripple output voltage ripple c out = 2.2f, 50ma load 15 mv pp t start startup time 1 ms i inr inrush current 2 2. the inrush current is limited by the internal soft-start circuitry. 500 ma v o / i o11 load regulation in 1:1 mode v batt = 5v, i out = 10~50ma 2 mv/ma v o / i o23 load regulation in 2:3 mode v batt = 4.5v, i out = 10~50ma 3 v o / i o12 load regulation in 1:2 mode v batt = 3.1v, i out = 10~50ma 3 12 efficiency in switching mode v batt = 3.1v, i out = 30ma 90 % 23 efficiency in switching mode v batt = 3.5v, i out = 30ma 90 % f osc oscillator frequency optional selectable 1 mhz t debup up switching debounce time 256 s i op12 operating quiescent current 1:2 mode without load 1.5 3.5 ma i op23 operating quiescent current 2:3 mode without load 1.3 3 i op11 operating current 1:1 mode without load 0.1 0.3 i off shutdown current en = 0v 0.7 5 a t offl temperature shutdown mode off 145 oc t offh temperature shutdown mode on 170 oc input levels v ih input high level pin en 1.5 5.5 v v il input low level 0.0 0.5 v
www.austriamicrosystems.com revision 1.03 5 - 16 as1301 data sheet - typical operating characteristics 7 typical operating characteristics v in = 2.7 to 5.25v, v out = 5v, c out = c bat = 2.2f, c fly1 = c fly2 =220nf, t amb = +25oc, unless otherwise specified. figure 3. efficiency vs. input voltage; i load =10ma figure 4. efficiency vs. input voltage; i load =20ma figure 5. efficiency vs. input voltage; i load =30ma figure 6. efficiency vs.input voltage; i load =40ma figure 7. efficiency vs. input voltage; i load =50ma figure 8. quiescent current vs. input voltage 0 10 20 30 40 50 60 70 80 90 100 2.75 3.25 3.75 4.25 4.75 5.25 input voltage (v) efficiency (%) . 0 10 20 30 40 50 60 70 80 90 100 2.75 3.25 3.75 4.25 4.75 5.25 input voltage (v) efficiency (%) . 1:2 mode 2:3 mode 1:1 mode 1:2 mode 2:3 mode 1:1 mode 0 10 20 30 40 50 60 70 80 90 100 2.75 3.25 3.75 4.25 4.75 5.25 input voltage (v) efficiency (%) . 0 10 20 30 40 50 60 70 80 90 100 2.75 3.25 3.75 4.25 4.75 5.25 input voltage (v) efficiency (%) . 1:2 mode 2:3 mode 1:1 mode 1:2 mode 2:3 mode 1:1 mode 0 10 20 30 40 50 60 70 80 90 100 2.75 3.25 3.75 4.25 4.75 5.25 input voltage (v) efficiency (%) . 1:2 mode 2:3 mode 1:1 mode 0 0.5 1 1.5 2 2.5 3 3.5 2.25 3.25 4.25 5.25 input voltage (v) quiescent current (ma) .
www.austriamicrosystems.com revision 1.03 6 - 16 as1301 data sheet - typical operating characteristics figure 9. output voltage vs. output current figure 10. output voltage vs. output current figure 11. output voltage vs. input voltage figure 12. output voltage vs. temp.; i out = 0.1ma figure 13. output voltage vs. temp.; i out = 10ma figure 14. output voltage vs. temp.; i out = 30ma 4.7 4.8 4.9 5 5.1 5.2 5.3 0.1 1 10 100 output current (ma) output voltage (v) . 4.7 4.8 4.9 5 5.1 5.2 5.3 0.1 1 10 100 output current (ma) output voltage (v) . vbatt = 3v vbatt = 4.5v vbatt = 5v vbatt = 3.5v vbatt = 4v 0 1 2 3 4 5 2.75 3.25 3.75 4.25 4.75 5.25 input voltage (v) output voltage (v) . 50ma 30ma 10ma 5.03 5.04 5.05 5.06 5.07 -40 -15 10 35 60 85 temperature (c) output voltage (v) . vbatt = 3.1v vbatt = 4.2v vbatt = 3.6v 0 1 2 3 4 5 2.75 3.25 3.75 4.25 4.75 5.25 input voltage (v) output voltage (v) . 50ma 30ma 10ma 5.03 5.04 5.05 5.06 5.07 -40 -15 10 35 60 85 temperature (c) output voltage (v) . vin = 3.1v vin = 4.2v vin = 3.6v 4.98 4.99 5 5.01 5.02 5.03 5.04 5.05 -40 -15 10 35 60 85 temperature(c) output voltage (v) . vbatt = 4.2v vbatt = 3.6v 4.6 4.7 4.8 4.9 5 5.1 5.2 -40 -15 10 35 60 85 temperature (c) output voltage (v) . vbatt = 3.6v vbatt = 3.1v vbatt = 4.2v vbatt = 3.1v
www.austriamicrosystems.com revision 1.03 7 - 16 as1301 data sheet - typical operating characteristics figure 15. efficiency vs. output current; v in = 3v figure 16. efficiency vs. output current; v in = 3.3v figure 17. efficiency vs. output current; v in = 3.5v figure 18. efficiency vs. output current; v in = 4v figure 19. efficiency vs. output current; v in = 4.3v figure 20. efficiency vs. output current; v in = 4.7v 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 output current (ma) efficiency (%) . 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 output current (ma) efficiency (%) . 1:2 mode 2:3 mode 1:2 mode 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 output current (ma) efficiency (%) . 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 output current (ma) efficiency (%) . 1:2 mode 2:3 mode 1:2 mode 2:3 mode 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 output current (ma) efficiency (%) . 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 output current (ma) efficiency (%) . 2:3 mode 1:2 mode 2:3 mode
www.austriamicrosystems.com revision 1.03 8 - 16 as1301 data sheet - typical operating characteristics figure 21. load transient; v batt = 5.2v figure 22. load transient; v batt = 3.6v figure 23. start-up time; v batt = 3v figure 24. start-up time; v batt = 5.25v figure 25. line transient; v batt = 4.5v to 3.5v 50s/div 50mv/div vout 50s/div 20ma/div iout 100mv/div vout 20ma/div iout 200s/div 2v/div vout 200s/div en 2v/div vout en 5v/div 100ma/div ibatt 5v/div 100ma/div ibatt 200s/div vout vbatt ibatt 1v/div 50mv/div 100ma/div f = 1khz rload = 1k duty cycle = 20%
www.austriamicrosystems.com revision 1.03 9 - 16 as1301 data sheet - detailed description 8 detailed description operating principle functional description the as1301 is a high efficiency and low noise switched capa citor dc-dc converter that is capable of boost operation. it is equipped with two built-in coupled h-bridge type switch configurations. based on the value of the output voltage the system automatically initia tes mode-switching to achieve the highest possible efficienc y. the regulation of the output voltage is achieved by a regulation loop, which modula tes the current drive capability of the power transistors so that the amount of charge transf erred from the input to the output at each clock cycle is controlled and is equal to the charge needed by the load. regulation loop the as1301 operates at constant frequency at any load. for the regulation loop power transistors, a resistor divider, and an error amplifier is used to keep the output volta ge within the allowed limits. the error amplifier takes the feedback and reference signals as inputs and generates the e rror voltage signal. the error voltage controls a driver that triggers the gate of the power transistor which modulates the current drive capability of the power transistors. the modulated power transistors cont rol the charge transferred from the input to the output and theref ore the regulation of the output voltage is realized. based on adjusting the amoun t of charge transferred, this regulation concept delivers the smallest voltage ripple possible. figure 26. functional block diagram + vbatt c bat vout c out c1+ c1- c2+ c2- en c fly1 c fly2 double-h bridge topology soft start vmode trig v ctrl ref por te m p state machine & control logic mode select gnd clk as1301 on off
www.austriamicrosystems.co m revision 1.03 10 - 16 as1301 data sheet - detailed description switch configuration the as1301 has nine built-in power switches in the shape of two coupled h-bridge topol ogies. the system features 1:2 and 2:3 operation modes as well as a 1:1 operation where the input is dire ctly connected to the output. this feedthrough mode is suitable for input voltages higher than the output voltage. in 2:3 operation mode two flying capacitors are placed in se ries and each capacitor is charged to a half of the input voltage. in pumping phase the flying capacitors are placed in parallel. the bottom-plates of the parallel flying capacitors c fly 1 and c fly 2 are then connected to the input voltage so t hat the voltage at the top-plates of the flying capacitors is boosted to a voltage equal to v batt + v batt /2. by connecting the top-plates of the capacitors to the output, the output voltage in 2:3 mode can be up to one and a half of v batt . if the top-plate voltage is higher than 5v, the regulation loop adapts the power transistor?s current driv e capability to drop some voltage. the 2:3 operation mode runs in single-phase operation only. in 1:2 operation mode just one of both flying capacitors is pl aced in series to the input vo ltage, and therefore charged to the input voltage. during pumping phase the input voltage is connected to the bottom-plate of the discharged flying capacitor c fly . the voltage at the top-plate of the capacitor is now boosted to 2v batt . by connecting the top-plate of the capacitor to the output, the output can be charged to twice the voltage of v batt . if the top-plate voltage is higher than 5v the regulation loop limits the ch arge transfer to the output. in collaborati on with the second flying capacitor this mode features dual-phase operation. figure 27. 2:3 operating mode v batt sw1 c fly1 c fly2 sw3 sw2 sw4 charging phase v out v batt sw1 c fly1 c fly2 sw3 sw2 sw4 pumping phase v out figure 28. 1:2 operating mode v batt sw1 c fly1 c fly2 sw3 sw2 sw4 v out sw1 c fly1 c fly2 sw3 sw2 sw4 v out charging phase pumping phase v batt
www.austriamicrosystems.co m revision 1.03 11 - 16 as1301 data sheet - detailed description overload protection when the output voltage drops significantly below battery vo ltage due to a very high load the as1301 enters into an overload protection condition. in this condition the output is connect ed to the input via a current limiting connection. once the overload is removed, the device enters soft-s tart period and ramps up to the nominal output voltage. undervoltage lockout, uvlo the as1301 is equipped with undervoltage lockout functiona lity. if the battery voltage drops below 2.7v (typ) the device enters the undervoltage lockout condition. the device re mains in this condition until the battery voltage is high enough to enter the soft-start period. an internal hysteres is of 100mv will prevent ringing during startup. if the input voltage climbs back to 2.8v (typ) after such a condition, the device turns-on automatically. shutdown mode the as1301 enters low-power shutdown mode when en is set to logic low. in shutdown the charge-pump action is halted, the output is completely disconnected from the input and v out will drop to 0v. during shutdown the output is set to a high-z condition. so it can be forced higher volt age then the input, be cause the permanent monitoring of the input- and output voltage will prevent an erroneous curren t form the output back to the input during shutdown. thermal shutdown the as1301 offers thermal shutdown, which prevents ev entual damage due to an over-temperature condition. thermal shutdown will be initiated if the junction temper ature exceeds 145c. if the temperature drops below this value, the thermal shutdown will be released aut omatically and the device will resume operation.
www.austriamicrosystems.co m revision 1.03 12 - 16 as1301 data sheet - application information 9 application information external component selection the high internal oscillator frequency of 1mhz permits the us e of small capacitors for both, the flying capacitors and the output capacitors. for any given load value of the flying- and output capacitors as well as their esr are affecting the output voltage performance. in general, the capacitor?s esr is inversely proportional to its physical size. larger ca pacitances and higher voltage ratings tend to reduce esr. the esr is a function of the fr equency too, so it must be rated at the devices operating frequency. another factor affecting capacitor esr is temperature. note: many capacitors have a huge capacity variation over temperature. this can be compensated by choosing a capacitor with a better thermal coefficient or by choosi ng a larger nominal value to ensure proper operation over temperature. input and output capacitor selection it is not critical which type of input bypass capacitor c bat and output filter capacitor c out is used, but it will affect the performance of the charge pump. low esr capacitors should be used to minimize v out ripple. multi-layer ceramic capacitors are recommended since they have extrem ely low esr and are available in small footprints. input capacitor an 2.2f input bypass low esr capacitor such as tantalum or ceramic is recommended to reduce noise and supply transients. during startup and mode change it supplies part of the peak input current drawn by the device. output capacitor the output capacitor is charged to the v out voltage during pumping phase. the esr of the output capacitor intro - duces steps in the output voltage waveform whenever the charge pump charges c out . these steps contribute to the ripple voltage of v out . therefore, ceramic or tantalum low esr capacitors are recommended for c out to minimize the output voltage ripple. flying capacitor selection to ensure the required output current and avoid high peak currents the values of the flying capacitors c fly 1 and c fly 2 are very critical. a 220nf capacitor is sufficient for most applications. dependent on the operation mode the as1301 alternately charges and discharges c fly 1/2 . since the flying capacitors lead a higher current than the output capacitor the esr of c fly 1/2 has a greater impact on the performance of the whole system. the voltage drop caused by the esr of the flying capacitors directly adds to t he output source resistance of the charge pump. therefore low esr capacitors, e.g. tantalum or cerami c, are recommended for the flying capacitors as well. table 4. recommended input and output capacitor part number c tc code rated voltage dimensions (l/w/t) manufacturer grm21br71a225ka01 2.2f x7r 10v 2x1.2x1.35mm murata www.murata.com table 5. recommended flying capacitor part number c tc code rated voltage dimensions (l/w/t) manufacturer grm188r71e224ka88 220nf x7r 25v 1.6x0.8x0.87mm murata www.murata.com
www.austriamicrosystems.co m revision 1.03 13 - 16 as1301 data sheet - package drawings and markings 10 package drawings and markings the device is available in a tdfn (3x3x0.8mm) 10-pin and wl-csp 8-bumps package. figure 29. tdfn (3x3x0.8mm) 10-pin package diagram note: 1. dimensioning and tolerancing conform to asme y14.5m-1994 . 2. all dimensions are in millimeters, angle is in degrees. 3. n is the total number of terminals. table 6. tdfn (3x3x0.8mm) 10-pin package dimensions symbol min typ max symbol min typ max a 0.70 0.75 0.80 d bsc 3.00 a1 0.00 0.02 0.05 e bsc 3.00 a3 0.20 ref d2 2.20 2.70 l1 0.03 0.15 e2 1.40 1.75 l2 0.13 l 0.30 0.40 0.50 aaa 0.15 0o bbb 0.10 k 0.20 ccc 0.10 b 0.18 0.25 0.30 ddd 0.05 e 0.50 eee 0.08 n 10 ggg 0.10 nd 5 (d/2 xe/2) 4 2x 2x top view aaa c aaa c e pin 1 index area d a b seating nx 10 ccc c a plane side view a3 0.08 c a1 c see detail b 4 pin 1 index area (d/2 xe/2) 5 6 btm view n-1 n b bb c a b ddd c e2 e2/2 d2 d2/2 nx b (nd-1) x e e 10 nx k nx l odd terminal side 5 datum a or b terminal tip e
www.austriamicrosystems.co m revision 1.03 14 - 16 as1301 data sheet - package drawings and markings figure 30. wl-csp 8-bumps package diagram 9 7 0 5 0 0 5 0 0 5 0 0 5 0 0 1 9 7 0 3 1 1 1 0 4 0 t y p . 40m 3 1 0 1 0 6 0 0 3 0 n o t e s : c c c c o p l a n a r i t y a l l d i m e n s i o n s i n m seating plane t o p t h r o u g h v i e w b o t t o m v i e w b a l l s i d e 250 typ.
www.austriamicrosystems.co m revision 1.03 15 - 16 as1301 data sheet - ordering information 11 ordering information table 7. ordering information part marking description delivery form package as1301a-bwlt aso4 5v/50ma low noise inductorless boost converter t&r wl-csp 8-bumps as1301a-btdt aso4 5v/50ma low noise inductorless boost converter t&r tdfn (3x3x0.8mm) 10-pin
www.austriamicrosystems.co m revision 1.03 16 - 16 as1301 data sheet - ordering information copyrights copyright ? 1997-200 8, austriamicrosystems ag, schloss premstaett en, 8141 unterpremstae tten, austria-europe. trademarks registered ?. all rights reserved. the mate rial herein may not be reproduced, adapted, merged, translated, stored, or used wit hout 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 freed om of the described devices from patent infringement. austriamicrosystems ag reserves the right to change spec ifications and prices at an y time and without notice. therefore, prior to designing this pro duct into a system, it is necessary to check with austriam icrosystems ag for current information. this product is intended for use in normal commercial applications. applications requiring extended temperature range, unusual environ mental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without 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 arising out of the furnishing, performance or use of the technical data herein. no obligation or liability to reci pient 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 a nd representatives, please visit: http://www.austriamicr osystems.com/contact-us

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