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AAT1299 low voltage 2mhz step-up dc/dc converter 1299.2007.06.1.0 1 switchreg ? general description the AAT1299 is a high efficiency, synchronous, fixed frequency, step-up converter with start-up inrush current limit and short-circuit protection. the input voltage ranges from 1.0v to the output voltage. the high 2mhz switching frequency and completely integrated control circuitry minimize the total solution footprint area while maintaining excellent regulation, ripple, and transient response throughout the full load range. light load switching frequency modulation and low quiescent current maintain high efficiency perform- ance for light load and sleep mode conditions. with a 1a peak switch current limit, the AAT1299 is capable of delivering 200ma to the load from a 1.8v input. the AAT1299 is available in a pb-free, space-sav- ing 2.0x2.1mm 8-pin sc70jw or 2.2x2.2mm 10- pin stdfn package, or in die form and is rated over the -40c to +85c temperature range. features ? 200ma output from a 1.8v input ?v in operation range: 1.0v to v out ? up to 93% efficiency ? low start-up voltage: 1.0v typical ? internal synchronous rectifier ? current mode control with internal feedback and compensation ? 2mhz fixed switching frequency ? 1a current limit ? maintains high efficiency over the output current range for improved battery life ? low 40a no load bias current ? short-circuit and over-current protection ? inrush current limit and soft start ? low shutdown current: <1.0a ? -40c to +85c temperature range ? 2.0x2.1mm sc70jw-8 or 2.2x2.2mm 10-pin stdfn package or die applications ? bluetooth? headsets ? digital cameras ? medical instruments ? mobile handsets ? mp3 and portable music players typical application 2.2h 4.7f 4.7 f v in v out vcc en vin lx out gnd AAT1299
AAT1299 low voltage 2mhz step-up dc/dc converter 2 1299.2007.06.1.0 pin descriptions pin configuration sc70jw-8 stdfn-10 (top view) (top view) die contact your local analogictech sales representative. pin # sc70jw-8 stdfn-10 symbol function 1 5 vcc bias supply voltage after start-up and feedback to the output voltage error amplifier. 2 4 en enable pin. logic high enables the ic. logic low disables the ic and disconnects the load from the input. shutdown current is <1a. 3 3 vin input voltage. supplies the ic at start-up. 4 1, 2 lx inductor connection. ties to the drains of the p-channel synchronous rectifier and the n-channel mosfet switch. 5 9 out boost converter output voltage; connects to the p-channel synchronous mos- fet source. bypass with ceramic capacitor to gnd. 6, 7, 8 7 gnd signal and power ground. connect output capacitor return. n/a 6, 8, 10 n/c not connected. n/a ep exposed paddle (bottom). connect to ground as closely as possible to the device. en vin lx gnd gnd gnd out vcc 1 2 3 45 6 7 8 vin vcc en lx lx n/c nc gnd n/c out 3 4 5 1 2 8 7 6 10 8
absolute maximum ratings 1 thermal characteristics 2 symbol description value units ja thermal resistance sc70jw-8 160 c/w stdfn-10 50 p d maximum power dissipation sc70jw-8 625 mw stdfn-10 2 w symbol description value units v n vin, out, vcc, lx to gnd -0.3 to 6.0 v v en en to gnd -0.3 to v in v t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c AAT1299 low voltage 2mhz step-up dc/dc converter 1299.2007.06.1.0 3 1. stresses above those listed in absolute maximum ratings may cause damage to the device. functional operation at conditions o ther than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. mounted on a fr4 board.
electrical characteristics 1 v in = 1.8v, t a = -40c to +85c, unless otherwise noted. typical values are t a = 25c. symbol description conditions min typ max units v in minimum start-up voltage i load = 1ma 1.0 v operating input voltage range 1.0 v out v out output voltage accuracy v in = 1.0v to 2.5v, v out -v out + v pwm mode 0.1 0.1 i q quiescent supply current no load 40 70 a (light load operation) 2 i shdn shutdown current en = 0v, v in = 5.5v 1.0 a r ds(on)h pmos on-resistance t a = 25c 750 m r ds(on)l nmos on-resistance t a = 25c 400 m i limit nmos current limit 1.0 a i ll light load current threshold 30 ma efficiency i out = 50ma, l = 2.2h 85 % v out /v out load regulation i load = 0 to 100ma 1.5 % v out /v out / v in line regulation v in = 1.0v to 2.5v 0.2 %/v f osc switching frequency t a = 25c 1.8 2.0 2.2 mhz d tymax maximum duty cycle 90 % v th(l-in) logic input low threshold for en 0.4 v v th(h-in) logic input high threshold for en 1.0 v AAT1299 low voltage 2mhz step-up dc/dc converter 4 1299.2007.06.1.0 1. the AAT1299 is guaranteed to meet performance specifications over the -40c to +85c operating temperature range and is assu red by design, characterization, and correlation with statistical process controls. 2. i q = i q_vout = i q_vcc .
typical characteristics AAT1299 low voltage 2mhz step-up dc/dc converter 1299.2007.06.1.0 5 minimum start-up voltage vs. load current current (ma) voltage (v) 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 0 2 40 60 80 100 120 140 160 resistive load constant current load light load mode output current threshold vs. input voltage input voltage (v) output current (ma) 0 20 40 60 80 100 120 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 increasing load decreasing load single-cell load regulation (v o = 3.3v) output current (ma) v out error (%) -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 0.1 1 10 100 v in = 1.5v v in = 1.2v dual-cell load regulation (v o = 3.3v) output current (ma) v out error (%) -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 0.1 1 10 100 100 0 v in = 2.0v v in = 2.4v v in = 3.0v single-cell to 3.3v efficiency output current (ma) efficiency (%) 50 60 70 80 90 100 0.1 1 10 100 1000 v in = 1.2v v in = 1.5v dual-cell to 3.3v efficiency output current (ma) efficiency (%) 50 60 70 80 90 100 0.1 1 10 100 100 0 v in = 3.0v v in = 2.4v v in = 2.0v
typical characteristics AAT1299 low voltage 2mhz step-up dc/dc converter 6 1299.2007.06.1.0 output voltage vs. temperature (v in = 1.5v; i o = 10ma) temperature ( c) output voltage error (%) -0.80 -0.60 -0.40 -0.20 0.00 0.20 0.40 -40 -20 0 20 40 60 80 line transient response (i o = 50ma; l = 2.2h; c o = 4.7f) output voltage (v) input voltage (v) time (50s/div) 3.26 3.28 3.30 3.32 3.34 1.50 1.75 2.00 2.25 2.50 2.4v 1.9v maximum load current capacity for a 4% drop in output voltage vs. input voltage (v out = 3.3v) input voltage (v) load current (ma) 0 100 200 300 400 500 600 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3. 0 load transient response (v in = 1.2v; l = 2.2h; c o = 4.7f) output current (a) output voltage (v) time (50s/div) 0.00 0.05 0.10 0.15 3.20 3.25 3.30 3.35 3.40 50ma 100ma no load input current vs. input voltage input voltage (v) input current (a) 0 40 80 120 160 200 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 switching frequency vs. temperature temperature ( c) switching frequency change (%) -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 -40 -15 10 35 60 85
typical characteristics AAT1299 low voltage 2mhz step-up dc/dc converter 1299.2007.06.1.0 7 soft-start inrush current (v in = 1.2v; i o = 40ma; v o = 3.3v) enable and output voltage (v) input current (a) time (500s/div) -4 -3 -2 -1 0 1 2 3 4 -0.25 0 0.25 0.5 0.75 1 1.25 1.5 1.75 output voltage input current enable soft-start inrush current (v in = 2.4v; i o = 100ma; v o = 3.3v) enable and output voltage (v) input current (a) time (500s/div) -4 -3 -2 -1 0 1 2 3 4 -0.25 0 0.25 0.5 0.75 1 1.25 1.5 1.75 output voltage enable input current full load output ripple (v in = 1.2v; 100ma load) time (250ns/div) v out (ac coupled) (20mv/div) v lx (2v/div) i l (100ma/div) light load output ripple (v in = 1.2v; 10ma load) time (1s/div) v out (ac coupled) (20mv/div) v lx (2v/div) i l (200ma/div)
AAT1299 low voltage 2mhz step-up dc/dc converter 8 1299.2007.06.1.0 functional block diagram functional description the AAT1299 synchronous step-up converter is targeted for single- or dual-cell alkaline, nimh, and nicd battery applications. it has a 1v typical start- up voltage. the high 2mhz switching frequency of the AAT1299 facilitates output filter component size reduction for improved power density and reduced overall footprint. it also provides greater bandwidth and improved transient response over other lower frequency step-up converters. the compensation and feedback is integrated with only three external components (c in , c out , l). low r ds(on) synchronous power switches provide high efficiency for heavy load conditions. switching frequency modulation and low quiescent current maintains this high efficiency for light load and sleep mode conditions. in addition to the improved efficiency, the synchro- nous boost has the added performance advantage of inrush current limit and short-circuit protection. voltage reference logic dh dl v ref out gnd en gnd lx comp. vin vcc mode control low voltage start-up start-up inrush control current sense error amp. 2mhz oscillator
pwm / light load control the AAT1299 is a fixed frequency pwm peak cur- rent mode control step-up converter. for light load conditions (10 to 20ma and below), the converter transitions to a light load mode to reduce the dom- inant switching losses. in addition to light load operation, a zero current comparator blocks reverse current in the p-channel synchronous mosfet, forcing dcm operation at light load. these controls, along with very low quiescent cur- rent, help to maintain high efficiency over the com- plete load range without the compromise of increased output voltage ripple during light load conditions. start-up and inrush current limit the start-up sequence of the AAT1299 varies depending upon whether the input voltage is greater than or less than 2v. above 1v, a start-up oscillator operating at 25% duty cycle controls the synchronous power stage and charges the output to 2v. for an input voltage greater than 2v, the out- put is charged at a constant current of 300ma until the output reaches a voltage level just below the input voltage. the step-up converter then takes control and continues to charge the output to the steady-state voltage. the step-up converter n- channel switch current is limited to 1a and the typ- ical start-up time is 2.5ms. short-circuit protection the p-channel synchronous mosfet body diode gives the AAT1299 the ability to provide output short-circuit current limit protection. applications information inductor selection the AAT1299 is designed to operate with a 2.2h inductor for all input/output voltage combinations. the inductor saturation current rating should be greater than the nmos current limit specification listed in the electrical characteristics table. if nec- essary, the peak inductor current can exceed the saturation level by a small amount with no signifi- cant effect on performance. table 1 provides a list of some suggested inductor manufacturers and their part numbers. output and input capacitor selection surface mount x5r or x7r ceramic capacitors are suggested for both the output and the input. for the output capacitor (c1 in figure 4) a 4.7f, 10v, x5r ceramic capacitor is necessary for stability, tran- sient response, and ripple performance. the same 0805 sized capacitor is used for the input (c2 of figure 4). if desired, a smaller, 0603 sized, 4.7f, 6.3v, x5r ceramic capacitor can be substituted for the input capacitor (c2). suggested ceramic capacitor suppliers are listed in table 1. pcb layout guidelines figures 1, 2, and 3 display the evaluation board layout and suggested component placement. due to the high switching speed of the AAT1299, it is important that the evaluation board layout be fol- lowed. even the best switch-mode power supply design cannot overcome the problems that can be caused by a poor layout. for the AAT1299, it is necessary that c1 and c2 be placed as close as possible to the ic with a good low impedance path to the gnd pins of the ic. it is also good practice to minimize the length of the trace from the out pin to the output inductor. this prevents switching noise from radiating into other high noise sensitive, high impedance circuits. AAT1299 low voltage 2mhz step-up dc/dc converter 1299.2007.06.1.0 9
figure 1: AAT1299 evaluation board figure 2: component placement. top side. figure 3: AAT1299 evaluation board bottom side. figure 4: AAT1299 evaluation board schematic. AAT1299 low voltage 2mhz step-up dc/dc converter 10 1299.2007.06.1.0 2.2h l1 4.7f c1 4.7f c2 u1 AAT1299 sc70jw-8 l1 sd3118-2r2 c1, c2 4.7f 10v 0805 x5r v out v in 1 2 3 enable vcc 1 en 2 vin 3 lx 4 out 5 gnd 6 gnd 7 gnd 8 AAT1299 u1
table 1: suggested component selection. manufacturer value part i sat dcr case size part number sumida 2.2h inductor 1.50a 75m 3.2 x 3.2 x 1.55 cdrh2d14-2r2 www.sumida.com cooper electronics 2.2h inductor 1.62a 69m 3.1 x 3.1 x 1.85 sd3118-2r2 www.cooperet.com manufacturer value part voltage case size part number murata 4.7f output or input capacitor 10v 0805 grm21br61a475ka73l www.murata.com input capacitor 6.3v 0603 grm188r60j475ke19d tdk 4.7f output or input capacitor 10v 0805 c2012x5r1a475k www.tdk.com input capacitor 6.3v 0603 c1608x5roj475k taiyo yuden 4.7f output or input capacitor 10v 0805 lmk212bj475mg www.t-yuden.com input capacitor 6.3v 0603 jmk107bj475ma AAT1299 low voltage 2mhz step-up dc/dc converter 1299.2007.06.1.0 11
AAT1299 low voltage 2mhz step-up dc/dc converter 12 1299.2007.06.1.0 ordering information package information 3 sc70jw-8 all dimensions in millimeters. voltage package marking 1 part number (tape and reel) 2 3.3v sc70jw-8 yrxyy AAT1299ijs-3.3-t1 3.3v 2.2x2.2mm stdfn-10 yqxyy AAT1299ioq-3.3-t1 3.3v die AAT1299 AAT1299izz-3.3 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . 3. the leadless package family, which includes qfn, tqfn, dfn, tdfn and stdfn, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. a solder fillet at the exposed copper edge cannot be guaranteed and is not re quired to ensure a proper bottom solder connection. 0.225 all analogictech products are offered in pb-free packaging. the term pb-free means semiconductor products that are in compliance with current rohs standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. for more information, please visit our website at http://www.analogictech.com/pbfree.
stdfn-10 die please contact your local analogictech sales representative. AAT1299 low voltage 2mhz step-up dc/dc converter 1299.2007.06.1.0 13 top view bottom view 2.200
AAT1299 low voltage 2mhz step-up dc/dc converter 14 1299.2007.06.1.0 advanced analogic technologies, inc. 830 e. arques avenue, sunnyvale, ca 94085 phone (408) 737-4600 fax (408) 737-4611 ? advanced analogic technologies, inc. analogictech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an analogictech pr oduct. no circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. analogictech reserves the right to make changes to their products or specifications or to discontinue any product or service with- out notice. except as provided in analogictechs terms and conditions of sale, analogictech assumes no liability whatsoever, an d analogictech disclaims any express or implied war- ranty relating to the sale and/or use of analogictech products including liability or warranties relating to fitness for a part icular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. in order to minimize risks associated with the customers applications, adequa te design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. testing and other quality control techniques are utilized to the extent an alogictech deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed. analogictech and the analogictech logo are trad emarks of advanced analogic technologies incorporated. all other brand and product names appearing in this document are registered trademarks or trademarks of their respective holder s.

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