View ST2S06A3309_2286583.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

july 2009 doc id 13866 rev 4 1/18 18 st2s06a33 st2s06b dual synchronous rectification with reset or inhibit, 0.5 a, 1.5 mhz adjustable step-down switching regulator features step-down current mode pwm (1.5 mhz) dc-dc converter fixed or adjustable output voltage from 0.8 v 2% dc output voltage tolerance synchronous rectification reset function for a version inhibit function for b version internal soft start for start-up current limitation and power on delay of 50-100 s typical efficiency: > 90% 0.5 a output current capability non-switching quiescent current: max 1 ma over temperature range r ds(on) 150 m (typ.) uses tiny capacitors and inductors available in qfn12l (4x4 mm) description the st2s06 is a dual step-down dc-dc converter optimized for powering low-voltage digital cores in odd applications and, generally, to replace the high current linear solution when the power dissipation may cause a high heating of the application environment. it provides up to 0.5 a over an input voltage range of 2.5 v to 5.5 v. a high switching frequency of 1.5 mhz allows the use of tiny surface-mount components as well as a resistor divider to set the output voltage value. only an inductor and two capacitors are required. a low output ripple is guaranteed by the current mode pwm topology and the utilization of low esr smd ceramic capacitors. the device is thermally protected and current limited to prevent damage due to accidental short circuit. the st2s06 series is available in the qfn12l (4x4 mm) package. qfn12l (4x4 mm) table 1. device summary order code package packaging st2s06a33pqr qfn12l (4x4 mm) tape and reel st2s06bpqr qfn12l (4x4 mm) tape and reel www.st.com
contents st2s06a33, st2s06b 2/18 doc id 13866 rev 4 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
st2s06a33, st2s06b diagram doc id 13866 rev 4 3/18 1 diagram * st2s06a/d ** st2s06b figure 1. schematic diagram ref control logic soft start gnd sw2 sw reset_out * fb1 gnd vi_sw vi_a fb2 hv ref delay trimming vi_sw inh** ref control logic soft start gnd sw2 sw reset_out * fb1 gnd vi_sw vi_a fb2 hv ref delay trimming vi_sw inh**
pin configuration st2s06a33, st2s06b 4/18 doc id 13866 rev 4 2 pin configuration figure 2. pin connections (top view) table 2. pin description pin n st2s06a st2s06b name and function 1 hv hv programing pin. it must be floating or connected to gnd. 2 fb2 fb2 feedback voltage 3 gnd2 gnd2 power ground 4 sw2 sw2 switching pin 5 vin_sw vin_sw power input voltage pin 6 sw1 sw1 switching pin 7 gnd1 gnd1 power ground 8 fb1/out1 fb1 feedback voltage / output voltage 9 reset_out nc reset out pin 10 nc inh inhibit pin 11 vin_a vin_a supply for analog circuit 12 gnd_a gnd_a system ground
st2s06a33, st2s06b maximum ratings doc id 13866 rev 4 5/18 3 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 3. absolute maximum ratings symbol parameter value unit v in_sw positive power supply voltage -0.3 to 7 v v in_a positive power supply voltage -0.3 to 7 v v inh inhibit voltage -0.3 to 7 v switch voltage max. voltage of output pin -0.3 to 7 v v fb1,2 /v o1 feedback voltage/output voltage -0.3 to 2.5 v v o1 output voltage (for v o > 1.6 v) -0.3 to 5 v current into vfb pin common mode input voltage +1 to -1 ma t j max junction temperature 150 c t stg storage temperature range -65 to +150 c t lead lead temperature (soldering) 10 sec. 300 c table 4. thermal data symbol parameter value unit r thjc thermal resistance junction-case 10 c/w r thja thermal resistance j unction-ambient 60 c/w table 5. esd performance symbol parameter test conditions value unit esd esd protection voltage hbm-dh11c 4 kv
electrical characteristics st2s06a33, st2s06b 6/18 doc id 13866 rev 4 4 electrical characteristics v in_sw = v in_a = 5 v, v 01 = 3.3 v, v o2 = 1.2 v, c 1 = 4.7 f, c 2 = c 3 = 22 f, l1 = l2 = 3.3 h, t j = - 30 to 125 c unless otherwise specified. typical values are referred to 25 c. table 6. electrical characteristics for st2s06a33 symbol parameter test conditions min. typ. max. unit out 1 output feedback pin 3.23 3.3 3.37 v fb 2 feedback voltage 784 800 816 mv i o1 i o1 pin bias current v o = 3.5 v 15 20 a i fb2 v fb pin bias current v fb = 1 v 600 na i q quiescent current v fb = 1 v 1.2 ma i o1,2 output current v in = 4 to 5.5 v (1) 0.8 a i min minimum output current 1 ma %v o1,2 / v i n reference line regulation 4v < v in < 5.5 v 0.032 %v o / v in v o1,2 reference load regulation 10ma < i o < 0.5 a 5.5 15 mv pwm f s pwm switching frequency (1) v fb = 0.7 v, t a = 25c 1.2 1.5 1.8 mhz d max maximum duty cycle v fb = 0.7 v, t a = 25c 85 94 % i swl switching current limitation 1 1.2 a i lkn nmos leakage current v fb = 0.9 v, t a = 25c 0.1 a i lkp pmos leakage current v fb = 0.9 v, t a = 25c 0.1 a r dson -n nmos switch on resistance i sw = 250 ma 0.15 0.3 r dson -p pmos switch on resistance i sw = 250 ma 0.2 0.4 efficiency i o = 20 ma to 100 ma 75 % i o = 100 ma to 0.5 a 90 % t shdn thermal shut down (2) 130 150 c t hys thermal shut down hysteresis (2) 15 c v o1,2 / i o load transient response (2) 100 ma < i o < 500 ma t r = t f => 100 ns, t a = 25c -5 +5 %v o reset section t del delay time t a = 25c 80 85 ms v res reset in threshold measured on input pin v in_a rising 4.5 4.6 4.75 v v in_a falling 4.12 4.2 4.28 1. v o = 90% of nominal value. 2. guaranteed by design, but not tested in production.
st2s06a33, st2s06b electrical characteristics doc id 13866 rev 4 7/18 v in_sw = v in_a = 5 v, v o1,2 =1.2 v, c 1 = 4.7 f, c 2 = c 3 = 22 f, l1 = l2 = 3.3 h, t j = -30 to 125 c unless otherwise specified. typical values are referred to 25 c. table 7. electrical characteristics for st2s06b symbol parameter test conditions min. typ. max. unit fb 1,2 feedback voltage 784 800 816 mv i fb1,2 v fb pin bias current v fb = 1 v 600 na i q quiescent current v inh > 1.2 v, v fb = 1 v 1 ma v inh < 0.4 v 1 a i o1,2 output current v in = 2.5 to 5.5 v (1) 0.8 a i min minimum output current 1 ma v inh inhibit threshold 2.5v < v in < 5 v 1.2 2.5v < v in < 5.5 v 1.3 v device off 0.4 i inh1,2 inhibit pin current 2 a %v o1,2 / v in reference line regulation 2.5v < v in < 5.5 v 0.032 %v o / v in v o1,2 reference load regulation 10 ma < i o < 0.5 a 5.5 15 mv pwm f s pwm switching frequency (1) v fb = 0.7 v, t a = 25c 1.2 1.5 1.8 mhz d max maximum duty cycle v fb = 0.7 v, t a = 25c 85 94 % i swl switching current limitation 1 1.2 a i lkn nmos leakage current v fb = 0.9 v, t a = 25c 0.1 a i lkp pmos leakage current v fb = 0.9 v, t a = 25c 0.1 a r dson -n nmos switch on resistance i sw = 250 ma 0.15 0.3 r dson -p pmos switch on resistance i sw = 250 ma 0.2 0.4 efficiency i o = 20 ma to 100 ma 75 % i o = 100 ma to 0.5 a 90 % t shdn thermal shut down (2) 130 150 c t hys thermal shut down hysteresis (1) 15 c v o1,2 / i o load transient response (1) 100 ma < i o < 500 ma, t r = t f 1 => 100 ns, t a = 25c -5 +5 %v o 1. v o = 90% of nominal value. 2. guaranteed by design, but not tested in production.
typical performance characteristics st2s06a33, st2s06b 8/18 doc id 13866 rev 4 5 typical performance characteristics figure 3. feedback voltage 1 vs. temperature (st2s06b) figure 4. feedback voltage 2 vs. temperature (st2s06b) figure 5. efficiency vs. output current 1 f igure 6. efficiency vs. output current 2 figure 7. switching frequency vs. temperature (st2s06a) figure 8. duty cycle vs. temperature (st2s06a) 0.78 0.79 0.8 0.81 0.82 -50 -25 0 25 50 75 100 125 temperature [c] v fb1 [v] v i =5v, v fb1 connected to v o1 i o1 =i o2 =no load 0.78 0.79 0.8 0.81 0.82 -50 -25 0 25 50 75 100 125 temperature [c] v fb1 [v] v i =5v, v fb1 connected to v o1 i o1 =i o2 =no load 0.78 0.79 0.8 0.81 0.82 -50 -25 0 25 50 75 100 125 temperature [c] v fb2 [v] v i =5v, v fb2 connected to v o2 i o1 =i o2 =no load 0.78 0.79 0.8 0.81 0.82 -50 -25 0 25 50 75 100 125 temperature [c] v fb2 [v] 0.78 0.79 0.8 0.81 0.82 -50 -25 0 25 50 75 100 125 temperature [c] v fb2 [v] v i =5v, v fb2 connected to v o2 i o1 =i o2 =no load v i =5v, v o1 =3.3v, i o2 no load 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 output current 1 [a] efficiency [%] v i =5v, v o1 =3.3v, i o2 no load 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 output current 1 [a] efficiency [%] 40 45 50 55 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 output current 2 [a] efficiency [%] v i =5v, v o2 =1.2v, i o1 no load 40 45 50 55 60 65 70 75 80 85 90 95 100 0 0.1 0.2 0.3 0.4 0.5 0.6 output current 2 [a] efficiency [%] v i =5v, v o2 =1.2v, i o1 no load v i =5v, v fb1 =3.2v, v fb2 =0.7v 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 -50 -25 0 25 50 75 100 125 temperature [c] frequency [mhz] v i =5v, v fb1 =3.2v, v fb2 =0.7v 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 -50 -25 0 25 50 75 100 125 temperature [c] frequency [mhz] v i =5v, v fb1 =3.2v, v fb2 =0.7v 90 91 92 93 94 95 96 97 98 99 100 -50 -25 0 25 50 75 100 125 temperature [c] duty cycle [%] v i =5v, v fb1 =3.2v, v fb2 =0.7v 90 91 92 93 94 95 96 97 98 99 100 -50 -25 0 25 50 75 100 125 temperature [c] duty cycle [%]
st2s06a33, st2s06b typical performance characteristics doc id 13866 rev 4 9/18 figure 9. switching frequency vs. temperature (st2s06b) figure 10. inhibit thres hold vs. temperature (st2s06b) figure 11. switching current limitation vs. input voltage (st2s06a) figure 12. pmos switch on resistance vs. temperature figure 13. nmos switch on resistance vs. temperature figure 14. delay time vs. temperature (st2s06a) v i rising from 0v to 5v, delay from v res threshold and reset pin below 0v. 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 -50 -25 0 25 50 75 100 125 temperature [c] frequency [mhz] 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 -50 -25 0 25 50 75 100 125 temperature [c] frequency [mhz] v i =5v, i o1 =i o2 =100ma 0 0.2 0.4 0.6 0.8 1 1.2 1.4 -50 -25 0 25 50 75 100 125 t [c] v inh (v) on off v i =5v, i o1 =i o2 =100ma 0 0.2 0.4 0.6 0.8 1 1.2 1.4 -50 -25 0 25 50 75 100 125 t [c] v inh (v) on off v i from 2.5v to 5.5v, output2 maximum load current 1 1.2 1.4 1.6 1.8 2 2.5 3 3.5 4 4.5 5 5.5 v i [v] i sw2 [a] v i from 2.5v to 5.5v, output2 maximum load current 1 1.2 1.4 1.6 1.8 2 2.5 3 3.5 4 4.5 5 5.5 v i [v] i sw2 [a] v cc =5v, i sw =250ma 100 120 140 160 180 200 220 240 -50 -25 0 25 50 75 100 125 t [c] r dson -p[mohm] v cc =5v, i sw =250ma 100 120 140 160 180 200 220 240 -50 -25 0 25 50 75 100 125 t [c] r dson -p[mohm] v cc =5v, i sw= 250ma 50 70 90 110 130 150 170 -50 -25 0 25 50 75 100 125 t [c] r dson -n[mohm] v cc =5v, i sw= 250ma 50 70 90 110 130 150 170 -50 -25 0 25 50 75 100 125 t [c] r dson -n[mohm] v i v res
typical performance characteristics st2s06a33, st2s06b 10/18 doc id 13866 rev 4 figure 15. delay time vs. temperature (st2s06a) figure 16. reset in threshold vs. temperature (st2s06a) figure 17. load transient response (st2s06a) figure 18. start-up transient (st2s06a) v i = 5v, i o1 from 100ma to 500ma v i = from 0v to 5v, i o1 =500ma, output voltage=3.3v v i rising from 0v to 5v 50 55 60 65 70 75 80 85 90 95 100 -50 -25 0 25 50 75 100 125 t [c] t del (ms) v i rising from 0v to 5v 50 55 60 65 70 75 80 85 90 95 100 -50 -25 0 25 50 75 100 125 t [c] t del (ms) rising falling 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5 -50 -25 0 25 50 75 100 125 t [c] v res (v) rising falling 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5 -50 -25 0 25 50 75 100 125 t [c] v res (v) i o1 v o1 v i v o1 figure 19. start-up transient (st2s06b) f igure 20. inhibit transient (st2s06b) v i = from 0v to 5v, i o1 =1a, output voltage=1.2v v inh = from 0v to 2v, v i =5v, i o1 =i o2 =1a v i v o1 i o1 v inh v o1 v o2
st2s06a33, st2s06b typical application doc id 13866 rev 4 11/18 6 typical application figure 21. application circuit for st2s06a 22 f c2 v o1 l1 v in vin_a vin_sw c1 4.7 f sw2 r3 r4 c3 22 f v o2 3.3 h 3.3 h l2 gnd2 r1 r2 reset_out gnd_a vfb2 vfb1 sw1 gnd1 nc st2s06a/d hv 22 f c2 v o1 l1 v in vin_a vin_sw c1 4.7 f sw2 r3 r4 c3 22 f v o2 3.3 h 3.3 h l2 gnd2 r1 r2 reset_out gnd_a vfb2 vfb1 sw1 gnd1 nc st2s06a/d hv figure 22. application circuit for st2s06b 22 f c2 v o1 l1 v in vin_a vin_sw c1 4.7 f sw2 r3 r4 c3 22 f v o2 3.3 h 3.3 h l2 gnd2 r1 r2 nc gnd_a vfb2 vfb1 sw1 gnd1 inh st2s06b hv 22 f c2 v o1 l1 v in vin_a vin_sw c1 4.7 f sw2 r3 r4 c3 22 f v o2 3.3 h 3.3 h l2 gnd2 r1 r2 nc gnd_a vfb2 vfb1 sw1 gnd1 inh st2s06b hv
application information st2s06a33, st2s06b 12/18 doc id 13866 rev 4 7 application information the st2s06 represents a series of dual adjustable current mode pwm step-down dc-dc converters with an internal 0.5 a power switch, packaged in a qfn12l (4x4 mm). it is a complete 0.5 a switching regulator with internal compensation that eliminates the need for additional components. the constant frequency, current mode, pwm architecture and stable operation with ceramic capacitors results in low, predictable output ripple. to clamp the error amplifier reference voltage a soft start control block generating a voltage ramp has been implemented. other circuits fitted to the device protection are the thermal shut-down block, which turns off the regulator when the junction temperature exceeds 150 c (typ.), and the cycle-by-cycle current limiting that provides protection against shorted outputs. because the st2s06 is an adjustable regulator, the output voltage is determined by an external resistor divider. the desired value is given by the following equation: v o = v fb [1+r1/r2] operation of the device requires few components: 2 inductors, 3 capacitors and a resistor divider. the chosen inductor must be capable of not saturating at the peak current level. its value should be selected keeping in mind that a large inductor value increases the efficiency at low output current and reduces output voltage ripple, while a smaller inductor can be chosen when it is important to reduce package size and total application cost. finally, the st2s06 has been designed to work properly with x5r or x7r smd ceramic capacitors both at the input and at the output. these types of capacitors, due to their very low series resistance (esr), minimize the output voltage ripple. other low esr capacitors can be used according to the need of the application without compromising the correct functionality of the device. due to the high switching frequency and peak current, it is important to optimize the application environment by reducing the length of the pcb traces and placing all the external components near the device. figure 23. reset function v tl v th v in reset t del v tl v th v in reset t del
st2s06a33, st2s06b package mechanical data doc id 13866 rev 4 13/18 8 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark.
package mechanical data st2s06a33, st2s06b 14/18 doc id 13866 rev 4 dim. mm. inch. min. typ. max. min. typ. max. a0. 8 00. 9 0 1.00 0.0 3 1 0.0 3 5 0.0 39 a1 0.02 0.05 0.001 0.002 a 3 0.20 0.00 8 b 0.25 0. 3 00. 3 5 0.010 0.012 0.014 d 3 . 9 0 4.00 4.10 0.154 0.157 0.161 d2 2.00 2.15 2.25 0.07 9 0.0 8 5 0.0 89 e 3 . 9 0 4.00 4.10 0.154 0.157 0.161 e2 2.00 2.15 2.25 0.07 9 0.0 8 5 0.0 89 e0. 8 00.0 3 1 l 0.45 0.55 0.65 0.01 8 0.022 0.026 qfn12l (4x4) mechanical data 7 93 6 3 61b
st2s06a33, st2s06b package mechanical data doc id 13866 rev 4 15/18 dim. mm. inch. min. typ. max. min. typ. max. a 33 0 12. 99 2 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n 99 101 3 . 898 3 . 9 76 t 14.4 0.567 ao 4. 3 5 0.171 bo 4. 3 5 0.171 ko 1.1 0.04 3 po 4 0.157 p 8 0. 3 15 tape & reel qfnxx/dfnxx (4x4) mechanical data
package mechanical data st2s06a33, st2s06b 16/18 doc id 13866 rev 4 figure 24. qfn12l (4x4 mm) footprint recommended data
st2s06a33, st2s06b revision history doc id 13866 rev 4 17/18 9 revision history table 8. document revision history date revision changes 3-sep-2007 1 initial release. 21-jan-2008 2 added root part number st2s06d33. 18-mar-2008 3 modified: table 2 on page 4 . 28-jul-2009 4 modified: table 1 on page 1 .
st2s06a33, st2s06b 18/18 doc id 13866 rev 4 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

▲Up To Search▲

Price & Availability of ST2S06A3309

	To Download ST2S06A3309 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .