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AS1323 1.6a quiescent current, single cell, dc-dc step-up converter data sheet www.austriamicrosystems.com revision 1.04 1 - 14 1 general description the AS1323 high-efficiency step-up dc-dc converter was designed specifically for single-cell, battery-pow- ered devices where lowest quiescent current and high efficiency are essential. the compact device is available in three fixed-voltage variations and is perfect for a wide variety of applications where extremely-low quiescent currents and very-small form factors are critical. the devices are available as the standard products shown in ta b l e 1 . see also ordering information on page 13 . integrated boot circuitry ensures start-up even with very- high load currents. the true output disconnect feature completely discon- nects the output from the battery during shutdown. the device is available in a tsot23-5 pin package. figure 1. typical operating circuit 2 key features 1.6a quiescent current input voltage range: 0.75 to 2v up to 100ma output current fixed output voltages: 2.7, 3.0 and 3.3v shutdown current: 0.1a output voltage accuracy: 3% efficiency: up to 85% no external diode or fets needed output disconnect in shutdown guaranteed 0.95v start-up voltage tsot23-5 package 3 applications the devices are ideal for single-cell portable devices including mobile phones, mp3 players, pdas, remote controls, personal medical devices, wireless transmitters and receivers, and any other battery-operated, portable device. table 1. standard products model fixed output voltage package AS1323-27 2.7v tsot23-5 AS1323-30 3.0v tsot23-5 AS1323-33 3.3v tsot23-5 AS1323 3 shdnn 1 vbatt 4 vout 5 lx 10f 2 vss 10f 10h 4vout 3 shdnn 2 vss 1 vbatt 5lx AS1323
www.austriamicrosystems.com revision 1.04 2 - 14 AS1323 data sheet - pinout 4 pinout pin assignments figure 2. pin assignments (top view) pin descriptions table 2. pin descriptions pin number pin name description 1 vbatt battery supply input and coil connection 2 vss negative supply and ground 3 shdnn shutdown input . 0 = shutdown mode. 1 = normal operating mode. 4vout output . this pin also supplies bootstrap power to the device. 5lx inductor connection . this pin is connected to the internal n-channel mosfet switch drain and p-channel synchronous rectifier drain. 4vout 3 shdnn 2 vss 1 vbatt 5 lx AS1323
www.austriamicrosystems.com revision 1.04 3 - 14 AS1323 data sheet - absolute maximum ratings 5 absolute maximum ratings stresses beyond those listed in table 3 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 electrical character- istics on page 4 is not implied. exposure to absolute maximum ra ting conditions for extended periods may affect device reliability. table 3. absolute maximum ratings parameter min max units comments vbatt, shdnn, lx to vss -0.3 +5 v maximum current vout, lx 1 a thermal resistance ja 207.4 oc/w on pcb electro-static discharge 2 kv hbm operating temperature range -40 +85 oc storage temperature range -65 +150 oc junction temperature +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?. the lead finish for pb-free leaded packages is matte tin (100% sn).
www.austriamicrosystems.com revision 1.04 4 - 14 AS1323 data sheet - electrical characteristics 6 electrical characteristics dc electrical characteristics t amb = -40c to +85c, v batt = 1.2v, v out = v out(nom) , shdnn = v out , r load = , unless otherwise noted. typical values are at ta = 25c.(unless otherwise spec ified). limits are 100% production tested at t amb = 25oc. limits over the operating temperature ran ge are guaranteed by design. table 4. electrical characteristics symbol parameter condition min typ max unit v inmin minimum input voltage 0.75 v v in operating input voltage t amb = 25oc 0.95 2 v v insu minimum start-up input voltage t amb = 25oc, r load = 100 0.75 0.95 v v out output voltage AS1323-27 2.619 2.7 2.781 v AS1323-30 2.91 3.0 3.09 AS1323-33 3.201 3.3 3.399 r load load depended drop of v out v batt = 1.5v; i load = 45ma 30 40 mv r ds-on n-channel on-resistance 0.5 1.0 p-channel on-resistance 0.75 1.5 i limit n-channel switch current limit programmed at 400ma 400 ma t on switch maximum on-time 6 s synchronous rectifier zero-crossing current 10 ma i op-out operating current into v batt v batt = 1.5v, v out = 3.3v, t amb = 25oc 6 a i q-out quiescent current to v out 1.6 3 a i q-bat quiescent current into v batt v batt = 1.5v, t amb = 25oc 0.3 1 a i sdi-out 1 1. v out is completely disconnected (0v) during shutdown. shutdown current to v out 200 na i sdi-bat shutdown current into v batt v batt = 1.5v, t amb = 25oc 100 na v il shdnn voltage threshold, low 150 mv v ih shdnn voltage threshold, high 900 mv i sdi shdnn input bias current t amb = 25oc, v sdi = v out 100 300 na
www.austriamicrosystems.com revision 1.04 5 - 14 AS1323 data sheet - typical operating characteristics 7 typical operating characteristics v out = 3.3v; t a = 25 c; c in = c out = 10f, l = 10h, i load = 10ma; v batt = 1.5v; unless otherwise specified. figure 3. efficiency vs. output current; v out = 3.3v figure 4. efficien cy vs. output current; v out = 3.0v 30 40 50 60 70 80 90 0.1 1 10 100 output current (m a) efficiency (%) . v in = 0.95v v in = 1.8v v in = 1.5v v in = 1.2v 30 40 50 60 70 80 90 0.1 1 10 100 output current (m a) efficiency (%) . v in = 1.8v v in = 1.5v v in = 1.2v v in = 0.95v figure 5. efficiency vs. output current; v out = 2.7v figure 6. efficiency vs. input voltage 30 40 50 60 70 80 90 0.1 1 10 100 output current (m a) efficiency (%) . v in = 1.8v v in = 1.5v v in = 1.2v v in = 0.95v 30 40 50 60 70 80 90 0.75 1 1.25 1.5 1.75 2 input voltage (v) efficiency (%) . i l oad = 80a i l oad = 800a i l oad = 11ma figure 7. output voltage vs. temperature f igure 8. output voltage vs. output current 3.28 3.285 3.29 3.295 3.3 3.305 3.31 3.315 3.32 -50 -25 0 25 50 75 100 125 temperature (c) output voltage (v) . no load i load = 10ma i load = 30ma 3 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 0 10203040506070 output current (m a) output voltage (v) . v in = 1.5v v in = 1.2v
www.austriamicrosystems.com revision 1.04 6 - 14 AS1323 data sheet - typical operating characteristics figure 9. output voltage vs. input voltage f igure 10. shutdown current vs. temperature 3.2 3.22 3.24 3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 input voltage (v) output voltage (v) . 0.1 1 10 100 1000 -50 -25 0 25 50 75 100 125 temperature (c) input current (na) . v in = 1.5v v in = 1.2v figure 11. minimum input startup votage vs. temperature figure 12. output voltage vs. input voltage; v out = 2.7v 0.5 0.6 0.7 0.8 0.9 1 -50-25 0 25 50 75100125 temperature (c) input voltage (v) . 2.62 2.64 2.66 2.68 2.7 2.72 2.74 2.76 2.78 0.75 1 1.25 1.5 1.75 2 input voltage (v) output voltage (v) . i out = 0ma i out = 10ma i out = 30ma figure 13. output voltage vs. input voltage; v out = 3.0v figure 14. output voltage vs. input voltage; v out = 3.3v 2.9 2.92 2.94 2.96 2.98 3 3.02 3.04 3.06 3.08 3.1 0.75 1 1.25 1.5 1.75 2 input voltage (v) output voltage (v) . i out = 0ma i out = 10ma i out = 30ma 3.2 3.22 3.24 3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 0.75 1 1.25 1.5 1.75 2 input voltage (v) output voltage (v) . i out = 0ma i out = 10ma i out = 30ma
www.austriamicrosystems.com revision 1.04 7 - 14 AS1323 data sheet - typical operating characteristics figure 15. output current vs. input voltage figure 16. switching waveform; v out = 2.7v 20 30 40 50 60 70 80 90 100 110 0.75 1 1.25 1.5 1.75 2 input voltage (v) output current (ma) . v out = 2.7v v out = 3.3v v out = 3.0v 200s/div i lx v out 20ma/div 50mv/div v lx 2v/div figure 17. switching waveform; v out = 3.0v figure 18. switching waveform; v out = 3.3v 200s/div i lx v out 20ma/div 50mv/div v lx 2v/div 200s/div i lx v out 20ma/div 50mv/div v lx 2v/div
www.austriamicrosystems.com revision 1.04 8 - 14 AS1323 data sheet - detailed description 8 detailed description the AS1323 is a compact, high-efficiency, step-up dc-dc converter guaranteed to start up with voltages as low as 0.95v, and operate with an input voltage down to 0.75 v. consuming only 1.6a of quiescent current, the device includes an integrated synchronous rectifie r that eliminates the need for an exte rnal diode and improves overall effi- ciency by minimizing losses (see synchronous rectification on page 8) . the AS1323 also features an active-low shut- down circuit that supply current to 0.1a. figure 19. block diagram pfm control a forced discontinuous, curr ent-limited, pulse-frequency modulation (pfm ) control scheme provides ultra-low quies- cent current and high efficiency over a wide output current-ra nge. rather than using an in tegrated oscillator, the induc- tor current is limited by the 400ma n-channel current limit or by the 6s switch maximum on-time. after each device-on cycle, the inductor current must ramp to zero before another cycle can start. when the error compar ator senses that the output has fall en below the regulation thresh old, another cycle can begin. synchronous rectification the integrated synchronous rectifier eliminates the need fo r an external schottky diode, reducing cost and pcb space. during normal operation, while the inductor discharges, the p-channel mosfet turns on and shunts the mosfet body diode. consequently the rectifier voltage drop is si gnificantly reduced improving efficiency without the need for external components. low-voltage startup circuit the AS1323 contains a unique low-voltage startup circuit whic h ensures start-up even with very high load currents. the minimum start-up voltage is independent of the load current. this device is powered from pin v batt , guaranteeing startup at input voltages as low as 0.95v. shutdown the AS1323 enter shutdown when the shdnn pin is driven low. during shutdown, the output is completely discon- nected from the battery. shutdown can be pulled as high as 3.6v, regardless of the voltage at pins v batt or v out . for normal operation, connect shdn to the input. AS1323 4 vout 3 shdnn ref 5 lx control logic startup system timing 2 vss comparator voltage l1 c out comparator discharge comparator charge 1 vbatt c in 0.95 to 1.6v
www.austriamicrosystems.com revision 1.04 9 - 14 AS1323 data sheet - application information 9 application information figure 20. typical application inductor selection the control scheme of the AS1323 allows for a wide range if inductor values. a 10h inductor should be sufficient for most applications (see figure 20) . smaller inductance values typi cally offer smaller physical size for a given series resistance , allowing the smallest over- all circuit dimensions. applications using larger inductance va lues may startup at lower battery voltages, provide higher efficiency and exhibit less ripple, but they may reduce the ma ximum output current. this o ccurs when the inductance is sufficiently large to prevent the maximum current limit (i limit ) from being reached before the maximum on-time (t on ) expires (see electrical characteristics on page 4) . for maximum output current, the inductor value should be chos en such that the controller reaches the current-limit before the maximum on-time is triggered: t onmax is 6s (typ). i limit is 400ma (typ). for larger inductor values, the peak inductor current (i peak ) can be determined by: the inductor?s incremental saturation current rating should be greater than the peak switching current. however, it is generally advisable to bias the inductor into saturation by as much as 20%, although this will slightly reduce efficiency. maximum output current the maximum output current (i outmax ) is a function of i peak , v in , v out , and the overall efficiency ( ) as indicated in the formula for determining i outmax : AS1323 3 shdnn 1 vbatt 4 vout 5 lx 10f 2 vss 10f 10h l v batt t on ? i limit ------------------------------- - > (eq 1 ) i peak v batt t on ? l ------------------------------- - = (eq 2 ) i outmax 1 2 -- - i peak v batt v out ---------------- - ?? ?? ?? ? = (eq 3)
www.austriamicrosystems.co m revision 1.04 10 - 14 AS1323 data sheet - application information capacitor selection choose input and output capacitors to supply the input and output peak currents with acceptable voltage ripple. the input filter capacitor (c in ) reduces peak currents drawn from the batter y and improves efficiency. low equivalent series resistance (esr) capacitors are recommended. note: ceramic capacitors have the lowest esr, but low esr tantalum or polymer capacitors offer a good balance between cost and performance. output voltage ripple has two components: variations in the charge stored in the output capacitor with each coil pulse, and the voltage drop across the capacitor?s esr caused by the current into and out of the capacitor: v ripple = v ripple(c) + v ripple(esr) (eq 4) v ripple(esr) = i peak r esr(cout) (eq 5) where: i peak is the peak inductor current. for ceramic capacitors, the output voltage ripple is typically dominated by v ripple(c) . for example, a 10f ceramic capacitor and a 10h inductor typically provide 75mv of out put ripple when stepping up from 1.2v to 3.3v at 50ma. low input-to-output voltage differences require higher output capacitor values. capacitance and esr variation of temperature should be c onsidered for best performance in applications with wide operating temperature ranges. pc board layout considerations the AS1323 has been specially designed to be tolerant to pc board parasitic inductances and resistances. however, to achieve maximum efficiency a careful pc boar d layout and component selection is vital. note: for the optimal performance the ic?s vss and the ground leads of the input and output capacitors must be kept less than 5mm apart using a grou nd plane. in addition, keep all connectio ns to coil as short as possible. the system robustness guarantees a reliable operation ev en if those recommendations are not fully applied. v ripple c () 1 2 -- - l v out v batt ? () c out ? -------------------------------------------------------------- ?? ?? i peak 2 i out 2 ? () ?? (eq 6)
www.austriamicrosystems.co m revision 1.04 11 - 14 AS1323 data sheet - pack age drawings and markings 10 package drawings and markings the device is available in an tsot23-5 package. figure 21. tsot23-5 package notes: 1. dimensioning and tolerancing conform to asme y14.5m - 1994. 2. dimensions are in millimeters. 3. dimension d does not include mold fl ash, protrusions, or gate burrs. mold flash, protrusions, and gate burrs shall not exceed 0.15mm per end. dimension e1 does not includ e interlead flash or protrusion. interlead flash or pro- trusion shall not exceed 0.15mm per side. dim ensions d and e1 are determined at datum h. 4. the package top can be smaller than the package bot tom. dimensions d and e1 are determined at the outer- most extremes of the plastic body exclusive of mold fl ash, tie bar burrs, gate burrs, and interlead flash, but include any mistmatches between the top of the package body and the bottom. d and e1 are determined at datum h. symbol min typ max notes symbol min typ max notes a 1.00 l 0.30 0.40 0.50 a1 0.01 0.05 0.10 l1 0.60ref a2 0.84 0.87 0.90 l2 0.25bsc b 0.30 0.45 n 5 b1 0.31 0.35 0.39 r 0.10 c 0.12 0.15 0.20 r1 0.10 0.25 c1 0.08 0.13 0.16 0o 4o 8o d 2.90bsc 3,4 1 4o 10o 12o e 2.80bsc 3,4 tolerances of form and position e1 1.60bsc 3,4 aaa 0.15 e 0.95bsc bbb 0.25 e1 1.90bsc ccc 0.10 ddd 0.20
www.austriamicrosystems.co m revision 1.04 12 - 14 AS1323 data sheet - pack age drawings and markings tape and reel pin1 orientation figure 22. tape&reel pin1 orientation user direction of feed top, through view tsot23-5 tsot23-5 tsot23-5 tsot23-5
www.austriamicrosystems.co m revision 1.04 13 - 14 AS1323 data sheet - ordering information 11 ordering information the device is available as the standard products shown in table 5 . all devices are rohs compliant and free of halogene substances. table 5. ordering information model marking output description delivery form package AS1323-bttt-27 asjn 2.7v 1.6a quiescent current, single cell, dc-dc step-up converter tape and reel tsot23-5 AS1323-bttt-30 asmp 3.0v 1.6a quiescent current, single cell, dc-dc step-up converter tape and reel tsot23-5 AS1323-bttt-33 asmq 3.3v 1.6a quiescent current, single cell, dc-dc step-up converter tape and reel tsot23-5
www.austriamicrosystems.co m revision 1.04 14 - 14 AS1323 data sheet www.austriamicrosystems.co m revision 1.04 14 - 14 AS1323 data sheet copyrights copyright ? 1997-200 9, austriamicrosystems ag, schloss premstaett en, 8141 unterpremstae tten, austria-europe. trademarks registered ?. all rights reserved. the materi al herein may not be reprodu ced, 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. austria- microsystems ag reserves the right to change specifications and prices at any time and without notice. therefore, prior to designing this product into a syst em, it is necessary to check with aust riamicrosystems ag for current informa- tion. this product is intended for use in normal commercial applications. applications requiring extend ed 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 a nd representatives, please visit: http://www.austriamicr osystems.com/contact-us

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