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july 2009 doc id 15474 rev 4 1/21 21 stbb1xx 1 a, high efficiency single inductor dual mode buck-boost dc-dc converter features buck-boost dc-dc converter operating input voltage range from 2.0 v to 5.5 v 2% dc feedback voltage tolerance synchronous rectification shutdown function 1.5 mhz switching frequency power save mode at light load typical efficiency: > 94 % 1 a output current capability shutdown current < 1 a available in dfn10 3 x 3 mm. applications single cell li-ion and 3 cells alkaline, ni-mh powered devices sd/mmc memory card supply palmtop computers cell phones digital cameras description the stbb1xx is a fixed frequency, high efficiency, buck-boost dc-dc converter able to provide output voltages ranging from 1.2 v to 5.5 v and input voltages from 2.0 v to 5.5 v. the device can operate with input voltages higher than, equal to, or lower than the output voltage making the product suitable for single lithium-ion, multicell alkaline or nimh applications where the output voltage is within the battery voltage range. the integrated low-r dson n-channel and p- channel mosfet switches contribute to its high efficiency. the mode pin allows selecting between auto mode and forced pwm mode thus taking benefit either of lower power consumption or best dynamic performance. the device includes also soft-start control, thermal shutdown and current limit. the stbb1xx is packaged in dfn10 3 x 3 mm. dfn10 (3 x 3 mm.) table 1. device summary part number order code marking output voltage stbb1xx stbb1pur bb1 adj www.st.com
contents stbb1xx 2/21 doc id 15474 rev 4 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.1 general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.2 dual mode operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.3 external synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.4 enable pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.5 protection features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.5.1 soft-start and short-circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.5.2 under-voltage lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.5.3 over-temperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 typical performance characteristi cs . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8.1 programming the output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8.2 inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8.3 input and output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 9 recommended pcb layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 10 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 11 different output voltag e versions of the stbb1xx available on request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 12 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
stbb1xx block diagram doc id 15474 rev 4 3/21 1 block diagram figure 1. stbb1xx block diagram control gate current sensor v ref oscillator control temp. sw1 sw2 v out fb pgnd modulator gnd device control mode/sync vina en v in control gate current sensor v ref oscillator control temp. sw1 sw2 v out fb pgnd modulator gnd device control mode/sync vina en v in
absolute maximum ratings stbb1xx 4/21 doc id 15474 rev 4 2 absolute maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. table 2. absolute maximum ratings symbol parameter value unit vina, vin input voltage - 0.3 to 7 v vout output voltage - 0.3 to 7 v sw1, sw2 dc voltage - 0.3 to 7 v fb dc voltage - 0.3 to 1.5 v mod/sync, en dc voltage - 0.3 to 7 v t j maximum junction temperature 150 c t stg storage temperature range - 65 to + 150 c t jop operating junction temperature range - 40 to + 85 c esd human body model 2 kv table 3. thermal data symbol parameter value unit r thjc thermal resistance junction-case 2.96 c/w r thja thermal resistance junction-ambient 30.9 c/w
stbb1xx pin configuration doc id 15474 rev 4 5/21 3 pin configuration figure 2. pin connections (top through view) table 4. pin description pin n symbol name and function 1 vout output voltage 2sw2 switch pin - internal switches are connected to this pin. connect inductor between sw1 to sw2 3 pgnd power ground 4sw1 switch pin - internal switches are connected to this pin. connect inductor between sw1 and sw2 5vin power input voltage. connect a ceramic bypass capacitor (10 f minimum) between this pin and pgnd 6en enable pin. connect this pin to gnd or a voltage lower than 0.4 v to shut down the ic. a voltage higher than 1.2 v is required to enable the ic. 7 mode (sync) operation mode selection. if mode pin is low, the stbb1xx automatically switches between pulse skipping and fixed frequency pwm according to the load level. if mode pin is pulled high, the stbb1xx works always in pwm mode. when a square waveform is applied, this pin provides the clock signal for oscillator synchronization 8 vina supply voltage for control stage 9 gnd signal ground 10 fb feedback voltage exposed pad power ground
typical application stbb1xx 6/21 doc id 15474 rev 4 4 typical application figure 3. application circuit - adjustable output version sw1 sw2 vin vina en mode/syn gnd pgnd fb vout r1 r2 cout l cin vout vin stbb1-a sw1 sw2 vin vina en mode/syn gnd pgnd fb vout r1 r2 cout l cin vout vin stbb1-a figure 4. application circuit - fixed output version sw1 sw2 vin vina en mode/syn gnd pgnd fb vout cout l cin vout vin stbb1-xx sw1 sw2 vin vina en mode/syn gnd pgnd fb vout cout l cin vout vin stbb1-xx table 5. list of external components (1) component manufacturer p art number value size cin murata grm188r60j106me47d 10 f 0603 cout murata grm188r60j106me47d 10 f 0603 l tdk vlcf4020t-2r2n1r7 2.2 h 4 x 4 x 2 mm r1 560 k (v o = 3.3 v) (2) 0402 r2 100 k 0402 1. above listed components refer to typical application. operation of the stbb1xx is not limited to the choice of these external components. 2. r1 and r2 are calculated acco rding to the following formula: r1 = r2 x (vout/vfb - 1) suggested value for r2 is 100 k . in order to reduce the quiescent current a maximum value of 500 k is possible.
stbb1xx electrical characteristics doc id 15474 rev 4 7/21 5 electrical characteristics v in = v ina = v en = 3.6 v, c in = 10 f, c out = 10 f, l = 2.2 h, t j = - 40 to 85c (unless otherwise specified; typical values are referred to t a = 25 c). table 6. electrical characteristics symbol parameter test conditions min. typ. max. unit v in input voltage range 2.0 5.5 v v uvlo under voltage lockout threshold vina rising 1.70 1.80 v vina falling 1.50 1.60 v fb feedback voltage 485 500 515 mv t j = 25c 490 500 510 mv v out output voltage range 1.2 5.5 v z fb fb input impedance 10 m i q no switching quiescent current (vin+vina) (see figure 3 , 4 ) fb=0.7v, v mode =0v 160 250 a fb=0.7 v, v mode =v in 600 750 i q operating quiescent current (vin+vina) i out =0a, v out =3.3v, v mode =0v 200 a i out =0a, v out =3.3v, v mode =v in 3.4 5.0 ma i qshdn shutdown quiescent current v en =0v, v in =3.6v 0.1 1 a freq oscillator frequency 1300 1500 1750 khz frequency range for synchronization 1300 2000 v en enable input logic low v in = 2.2v to 5.5v 0.4 v enable input logic high v in = 2.2v to 5.5v 1.2 i en enable pin current v en = 5.5v 0.01 1 a v mode/sync mode/sync input logic low v in = 2.2v to 5.5v 0.4 v mode/sync input logic high v in = 2.2v to 5.5v 1.2 i mode/sync mode/sync pin current v mode/sync = 5.5v 0.01 1 a %v out line regulation 2.2v electrical characteristics stbb1xx 8/21 doc id 15474 rev 4 efficiency, v in = 3.6 v, v out = 3.3 v i out =10ma; v mode =0 89 % i out =10ma; v mode =v in 67 i out =100ma; v mode =v in 94 t shdn thermal shutdown 140 c t hys thermal shutdown hysteresis 20 c table 6. electrical characteristics (continued) symbol parameter test conditions min. typ. max. unit
stbb1xx detailed description doc id 15474 rev 4 9/21 6 detailed description 6.1 general description the stbb1xx is a high efficiency dual mode buck-boost switch mode converter. thanks to the 4 internal switches, 2 p-channel and 2 n-channel, and its unique control mechanisms it is able to deliver e well-regula ted output voltage using a variable input voltage which can be higher than, equal to or lower than the desired output voltage. this solves most of the power supply problems that circuit designers face when dealing with battery powered equipment. the controller uses an average current mode technique in order to obtain good stability in all possible conditions of input voltage, output voltage and output current. in addition, the peak inductor current is monitored to avoid saturation of the coil. the stbb1xx can work in two different modes: pwm mode or power save mode. in the first case the device operates with a fixed oscillator frequency in all line/load conditi ons. this is the suitable condition to obtain the maximum dynamic performances. in the second case the device operates in burst mode allowing a drastic reduction of power consumption. top-class line and load transients are achieved thanks to feed-forward technique and due to the innovative control method specifically designed to optimize the performances in the buck-boost region where input voltage is very close to the output voltage. the stbb1xx is self protected from short circuit and over-temperature. under-voltage lockout and soft-start guarantee proper operation during startup. input voltage and ground connections are split into power and signal pins. this allows reduction of internal disturbances when the 4 internal switches are working. the switch bridge is connected between the vin and pgnd pins while all logic blocks are connected between vina and gnd. 6.2 dual mode operation the stbb1xx works in pwm or in power save (ps) mode according to the different operating conditions. if the mode pin is pulled high the device works only in pwm mode even at light or no load. in this condition stbb1xx provides the best dynamic performance. if the mode pin is logic low, the stbb1 operation changes according to the average input current handled by the device. at low average current the stbb1xx enters in ps mode allowing very low power consumption and thus obtaining very good efficiency event at light load. when the average current increases, the device automatically switches to pwm mode in order to deliver the power needed by the load. in ps mode the stbb1xx implements a burst mode operation. if the output voltage increases above its nominal value the device stops switching. as soon the v out falls below the nominal value the device starts switching again with a programmed average current higher than the one needed by the load. figure 8 in section 7 shows ps mode operation areas vs. output current in typical application conditions.
detailed description stbb1xx 10/21 doc id 15474 rev 4 6.3 external synchronization the stbb1xx implements external synchronization pin. if and external clock signal is applied to the mode (syn) pin with a frequency between 1.35 mhz and 2.0 mhz and with proper low/high levels, the device automatically goes in pwm mode and the external clock is used as switching oscillator. 6.4 enable pin the device operates when en pin is set high. if en pin is set low the device stops switching, all the internal blocks are turned off. in this condition the current drawn from vin/vina is below 1 a in the whole temperature range. in addition the internal switches are in off state so the load is electrically disconnected from the input, this avoids unwanted current leakage from the input to the load. 6.5 protection features the stbb1xx implements different types of protection features. 6.5.1 soft-start and short-circuit after the en pin is pulled high, or after a suitable voltage is applied to vin, vina and en the device initiates the startup phase. the average current limit is set to 400 ma at the beginning and is gradually increased while tracking the output voltage increase. as soon the output voltage reaches 1.0 v the average current limit is set to its nominal value. this method allows for a current limit proportional to the output voltage. if there is a short in the v out pin, the output current will not exceed 400 ma. this process is not handled by a timer so the device is also able to start up even with large capacitive loads. 6.5.2 under-voltage lockout the under voltage lockout function prevents improper operation of stbb1xx when the input voltage is not high enough. when the input voltage is below the vuvlo threshold the device is in shutdown mode. the hysteresis of 100 mv prevents unstable operation when the input voltage is close to the uvlo threshold. 6.5.3 over-temperature protection an internal temperature sensor continuously monitors the ic junction temperature. if the ic temperature exceeds 140 c typically the de vice stops operating. as soon as the temperature falls below 120 c typically normal operation is restored.
stbb1xx typical performance characteristics doc id 15474 rev 4 11/21 7 typical performance characteristics (l = 2.2 h, v o = 3.3 v, all measurements done with circuit shown in figure 3 and external components listed in ta bl e 5 ) figure 5. efficiency vs. i out in auto mode figure 6. efficiency vs. i out in pwm mode figure 7. efficiency vs. v in , i out = 500 ma figure 8. ps to pwm transition figure 9. max i out vs. v in figure 10. boost region operation v in = 2.5 v v o = 3.3 v i o = 50 ma, pulse skipping 50 60 70 80 90 100 1 10 100 1000 output current [ma] efficiency [%] v in = 3.6 v v in = 2.2 v v in = 5.0 v 50 60 70 80 90 100 1 10 100 1000 output current [ma] efficiency [%] v in = 3.6 v v in = 2.2 v v in = 5.0 v 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current [ma] efficiency [%] v in = 3.6 v v in = 5.0 v v in = 2.2 v 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current [ma] efficiency [%] v in = 3.6 v v in = 5.0 v v in = 2.2 v 50 60 70 80 90 100 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 input voltage [v] efficiency [%] v o = 2.5 v v o = 5.0 v v o = 3.3 v 50 60 70 80 90 100 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 input voltage [v] efficiency [%] v o = 2.5 v v o = 5.0 v v o = 3.3 v 100 200 300 400 500 600 700 800 2.1 2.4 2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 vin [v] i out [ma] 100 200 300 400 500 600 700 800 2.1 2.4 2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 vin [v] i out [ma] 200 300 400 500 600 700 800 900 1000 1100 1200 22.533.544.555.5 input voltage output current [ma] v o = 2.5 v v o = 3.3 v v o = 5.0 v 200 300 400 500 600 700 800 900 1000 1100 1200 22.533.544.555.5 input voltage output current [ma] v o = 2.5 v v o = 3.3 v v o = 5.0 v sw1 3 v/div sw2 3 v/div i l 0.2 a/div v o 70 mv/div ac coupled timebase: 2 s/div sw1 3 v/div sw2 3 v/div i l 0.2 a/div v o 70 mv/div ac coupled timebase: 2 s/div
typical performance characteristics stbb1xx 12/21 doc id 15474 rev 4 figure 11. boost region operation figure 12. buck-boost region operation v in = 2.5 v v o = 3.3 v i o = 200 ma, pwm mode v in = 3.6 v v o = 3.3 v i o = 100 ma, pulse skipping mode figure 13. buck-boost region operation figure 14. buck-boost region operation v in = 3.6 v v o = 3.3 v i o = 500 ma, pwm mode v in = 3.6 v v o = 3.3 v i o = 50 ma, pwm mode figure 15. buck region operation figure 16. buck region operation v in = 4.2 v v o = 3.3 v i o = 100 ma, pulse skipping mode v in = 4.2 v v o = 3.3 v i o = 500 ma, pwm mode sw1 3 v/div sw2 3 v/div i l 0.2 a/div v o 20 mv/div ac coupled timebase: 0.5 s/div sw1 3 v/div sw2 3 v/div i l 0.2 a/div v o 20 mv/div ac coupled timebase: 0.5 s/div sw1 3 v/div sw2 3 v/div i l 0.2 a/div v o 100 mv/div ac coupled timebase: 1s/div sw1 3 v/div sw2 3 v/div i l 0.2 a/div v o 100 mv/div ac coupled timebase: 1s/div sw1 3 v/div sw2 3 v/div i l 0.3 a/div v o 30 mv/div ac coupled timebase: 0.5 s/div sw1 3 v/div sw2 3 v/div i l 0.3 a/div v o 30 mv/div ac coupled timebase: 0.5 s/div sw1 3 v/div sw2 3 v/div i l 0.1 a/div v o 20 mv/div ac coupled timebase: 1 s/div sw1 3 v/div sw2 3 v/div i l 0.1 a/div v o 20 mv/div ac coupled timebase: 1 s/div sw1 3 v/div sw2 3 v/div i l 0.4 a/div v o 300 mv/div ac coupled timebase: 2 s/div sw1 3 v/div sw2 3 v/div i l 0.4 a/div v o 300 mv/div ac coupled timebase: 2 s/div sw1 3 v/div sw2 3 v/div i l 0.4 a/div v o 20 mv/div ac coupled timebase: 0.2 s/div sw1 3 v/div sw2 3 v/div i l 0.4 a/div v o 20 mv/div ac coupled timebase: 0.2 s/div
stbb1xx application information doc id 15474 rev 4 13/21 8 application information 8.1 programming the output voltage the stbb1xx is available in two versions: fixed output voltage (stbb1-xx) and adjustable output voltage (stbb1-a). in the first case the device integrates the resistor divider needed to set the correct output voltage. this allows the saving of 2 external components. the fb pin must be connected directly to v out . for the adjustable version, the resistor divider must be connected between v out and gnd and the middle point of the divider must be connected to fb as shown in figure 3 . equation 1 a suggested value for r2 is 100 k . to reduce the power consumption a maximum value of 500 k can be used. 8.2 inductor selection the inductor is the key passive component for switching converters. with a buck-boost device, the inductor selection must take into consideration the boundary conditions in which the converter works, as buck at the maximum input voltage and as a boost at the minimum input voltage. two critical inductance values are then obtained according to the following formulas: equation 2 equation 3 where: fs: minimum switching frequency i l = the peak-to-peak inductor ripple current. as a rule of thumb, the peak-to-peak ripple can be set at 10 % - 20 % of the output current. ? ? ? ? ? ? ? ? ? = 1 v v 2 r 1 r fb out l max max buck min i fs vin ) vout vin ( vout l ? = ? l min min boost min i fs vout ) vin vout ( vin l ? = ?
application information stbb1xx 14/21 doc id 15474 rev 4 the minimum inductor value for the application is the higher between equation 2 and equation 3 . in addition to the inductance val ue the maximum current the inductor can handle must be calculated in order to avoid saturation. equation 4 equation 5 where is the estimated efficiency of stbb1xx. the maximum of the two values above must be considered when selecting the inductor. 8.3 input and output capacitor selection it is recommended to use ceramic capacitors with low esr as input and output capacitors in order to filter any disturbance present in the input line and to obtain stable operation. minimum values of 10 f for both capacitors are needed to achieve good behavior of the device. the input capacitor must be placed as close as possible to the device. l fs vin 2 ) vout vin ( vout ) / i ( i max max out buck peak ? + = ? l fs vout 2 ) vin vout ( vin vin i vout i min min min out boost peak ? + = ?
stbb1xx recommended pcb layout doc id 15474 rev 4 15/21 9 recommended pcb layout figure 17. component placement figure 18. top layer routing figure 19. bottom layer routing
package mechanical data stbb1xx 16/21 doc id 15474 rev 4 10 package mechanical data in order to meet environmental requirements, st offers these de vices in different grades of ecopack? packages, depending on their level of environmental compliance. ecopack? specifications, grade definitions an d product status are available at: www.st.com. ecopack? is an st trademark.
stbb1xx package mechanical data doc id 15474 rev 4 17/21 dim. mm. mil s . min. typ. max. min. typ. max. a0. 8 00. 9 0 1.00 3 1.5 3 5.4 39 .4 a1 0.02 0.05 0. 8 2.0 a2 0.55 0.65 0. 8 0 21.7 25.6 3 1.5 a 3 0.20 7. 9 b 0.1 8 0.25 0. 3 07.1 9 . 8 11. 8 d2. 8 5 3 .00 3 .15 112.2 11 8 .1 124.0 d2 2.20 8 6.6 e2. 8 5 3 .00 3 .15 112.2 11 8 .1 124.0 e2 1.40 1.75 55.1 6 8 . 9 e 0.50 1 9 .7 l0. 3 0 0.40 0.50 11. 8 15.7 1 9 .7 ddd 0.0 83 .1 dfn10 ( 3 x 3 mm) mechanical data 7426 33 5f
package mechanical data stbb1xx 18/21 doc id 15474 rev 4 dim. mm. inch. min. typ. max. min. typ. max. a1 8 0 7.0 8 7 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 14.4 0.567 ao 3 . 3 0.1 3 0 bo 3 . 3 0.1 3 0 ko 1.1 0.04 3 po 4 0.157 p 8 0. 3 15 tape & reel qfnxx/dfnxx ( 3 x 3 ) mechanical data
stbb1xx different output voltage versions of the stbb1xx available on request doc id 15474 rev 4 19/21 11 different output voltage versions of the stbb1xx available on request table 7. options available on request order codes marking output voltages stbb1-18pur bb1 18 1.8 v stbb1-25pur bb1 25 2.5 v stbb1-28pur bb1 28 2.8 v STBB1-33PUR bb1 33 3.3 v
revision history stbb1xx 20/21 doc id 15474 rev 4 12 revision history table 8. document revision history date revision changes 19-mar-2009 1 first release. 25-mar-2009 2 modified: figure 5 and figure 7 on page 11 . 01-apr-2009 3 modified: figure 3 and figure 4 on page 6 . 15-jul-2009 4 modified: equation 4 and equation 5 on page 14 .
stbb1xx doc id 15474 rev 4 21/21 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2009 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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