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august 2011 doc id 018980 rev 1 1/16 16 stodd03 monolithic 2-channel power management for high-definition odd with integrated power switch features 1.2 mhz dc-dc current mode pwm converter input voltage from 4 v up to 6 v step-down 3.3 v fixed output voltage, up to 700 ma load step-up output current up to 500 ma 2% step-down output voltage tolerance 3% step-up output voltage tolerance synchronous rectification step-down power-save mode at light load typical efficiency: 90% internal soft-start enable functions true cutoff function for step-up converter integrated motor control power switch uses tiny capacitors and inductors available in qfn16 (4 x 4 mm) description the stodd03 is a 2-channel power management device intended for blu-ray applications based on high density optical storage devices. it integrates one step-down converter able to provide 3.3 v fixed output voltage up to 700 ma load, and one step-up converter to provide the power supply needed for the blue laser in applications wher e only 5 v input voltage is available. the step-up output voltage is adjustable in the range from 6.5 v to 14 v, with current capability up to 500 ma. both step-down and step-up channels integrate low r ds_on n- channel and p-channel mosfets, allowing high dc-dc efficiencies. the enab le function with true shutdown makes the step-up section particularly suitable for optical storage power management applications. moreover, the stodd03 has a 1 a integrated power switch for motor control power supply. the high switching frequency allows the use of tiny smd components. low output ripple voltage is achieved thanks to the current mode pwm topology. the device includes soft-start control, thermal shutdown, and peak current limit to prevent damage due to accidental overload. the stodd03 is packaged in a qfn16 (4 x 4 mm). qfn16l (4 x 4 mm) table 1. device summary part number order code marking package stodd03 STODD03PQR odd03 qfn16 (4 x 4 mm) www.st.com
contents stodd03 2/16 doc id 018980 rev 1 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
stodd03 block diagram doc id 018980 rev 1 3/16 1 block diagram figure 1. block diagram fb2 s tep down s tep up gnd s w1 o u t1 fb1 v in _ a en1 v in _ p en s w en s w power s wit c h power s witch control b lock s w2 p s w out vin_p s w 1,9,11 2 3 10 8 7 15 14 en2 s tep- u p control b lock 4 6 1 3 16 5 12 am09 3 05v1
absolute maximum ratings stodd03 4/16 doc id 018980 rev 1 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. all values are referred to gnd. table 2. absolute maximum ratings symbol parameter value unit v in_p power supply input voltage -0.3 to 7 v vin_psw power switch input voltage -0.3 to 7 v v in_a analog supply input voltage -0.3 to 7 v en xx all enable pins voltage -0.3 to v in_a v sw1 ch1 input switching pin -0.3 to 16 v sw2 ch2 output switching pin -0.3 to 7 v psw out power switch output pin -0.3 to 7 v i sw power switch max output current 1.2 a out 1 ch1 output voltage pin -0.3 to 16 v fb 1 ch1 feedback voltage pin -0.3 to 2.5 v fb 2 ch2 feedback voltage pin -0.3 to 5 v t stg storage temperature range -50 to 150 c t op operating junction temperature range -25 to 125 c table 3. thermal data symbol parameter value unit r thjc thermal resistance junction-case 2.5 c/w r thja thermal resistance j unction-ambient 46 c/w
stodd03 pin configuration doc id 018980 rev 1 5/16 3 pin configuration figure 2. pin connections (top view) table 4. pin description pin number symbol function 1 gnd_p1 power ground pin (ch1) 2 fb1 step-up feedback pin (ch1) 3v in_a power supply for internal analog circuits 4 en2 step-down enable pin. connect to v in_a if not used. 5 psw out power switch output pin. psw out output current is not internally limited. do not exceed 1 a max. 6 vin_psw power switch input 7v in_p power input voltage 8 sw2 step-down switching pin (ch2) 9 gnd_p2 power ground (ch2) 10 fb2 step-down feedback (ch2) 11 gnd_a analog ground pin 12 out1 step-up output voltage 13 en-sw power switch enable pin active high (see ta bl e 5 ) 14 sw1 step-up switching pin (ch1) 15 en1 step-up enable pin. step-up is enabled if en1 > 1.2 v and en-sw is set low (see also table 6: step-up en1 and en-sw truth table ). when the step-up is disabled, no current will flow to the load thanks to the true-shutdown function. 16 en-sw power switch enable pin active low (see ta bl e 5 ) epad epad exposed pad to be connected to a suitable gnd layer area, through vias, for thermal heat dissipation.
pin configuration stodd03 6/16 doc id 018980 rev 1 table 5. power switch truth table en-sw en-sw power switch status hh open ll open lh open hl close table 6. step-up en1 and en-sw truth table en-sw en1 en-sw step-up output status xh h off xl h off xl l off xh l on
stodd03 typical application doc id 018980 rev 1 7/16 4 typical application figure 3. application circuit fb2 l2 c5 v out2 s tep down s tep up gnd s w1 o u t1 fb1 v in _ a en1 v in _ p en s w r1 r2 in l1 v c1 c 3 c2 c4 v out1 en s w power s witch power s witch control b lock s w2 p s w out v in_p s w 3 . 3 v 6.5 v ? 14 v 5 v 1,9,11 2 3 10 8 7 15 14 en2 s tep- u p control b lock 4 6 1 3 16 5 12 am09 3 06v1 table 7. list of external components (1) component value recomme nded part number c1, c2, c3 10 f murata, grm21br61a106ke19l c4, c5 22 f murata, grm32er61c226ke20l l1 4.7 h coilcraft, lps6225-472mlb l2 3.3 h coilcraft, lps4018-332mlb r1, r2 33 k , 3.3 k v out1 = 8.8 v (2) 1. the components listed above refer to a typica l applications circuit. operation of the st odd03 is not limited to the choice of these external components. if a different solution is used, it is recommended to validate the suitability of the external components by thoroughly testing the application on a pcb evaluation board. 2. r1 and r2 are calculated acco rding to the following formula: r1 = r2 x [(v out1 / v fb1 )- 1]. resistors in the range of 1 k to 50 k are recommended.
electrical characteristics stodd03 8/16 doc id 018980 rev 1 5 electrical characteristics refer to the typical application circuit, v in_p = v in_a = v in_psw = v en1,2 = 5 v, v out1 = 9 v, v out2 = 3.3 v, c 1,2,3 = 10 f, c 4,5 = 22 f, l1 = 4.7 h, l2 = 3.3 h, t j = - 25 to 125 c (unless otherwise specified, typical values are given at t j = 25 c). table 8. electrical characteristics symbol parameter test conditions min. typ. max. unit v in input voltage range 4 6 v i supply supply current v en1,2 > 1.2 v, no switching 1.6 2 ma v en1,2 < 0.4 v, no switching 1.2 2 ma step-up section v out output voltage range 6.5 14 v v fb1 feedback voltage t j = 0 to 85 c 0.776 0.8 0.824 v feedback voltage accuracy t j = 0 to 85 c -3 3 % i fb1 feedback current v fb1 = 0 v, v en1 = 2 v 600 na i out1_off (leak) output leakage current v en = 0 v, t j = 0 to 80 c 20 a v out1 ovp overvoltage protection (1) v fb1 = 0 v 14.8 15.3 15.8 v r dson_n internal n-channel r dson i sw1 =400 ma 300 m r dson_p internal p-channel r dson i sw1 =400 ma 300 i sw1 (leak) internal leakage current v sw1 = 4 v, v fb1 = 2 v, v en1 = 0 v 2 a i sw1 (lim) sw current limitation v out1 = 9.2 v 2.6 a pwm f s oscillator frequency to be measured on sw1 pin 0.75 1.2 1.5 mhz d max max oscillator duty cycle on sw1 pin, v fb1 = 0.7 v 70 90 % efficiency i out1 = 50 ma, v out1 = 7 v 80 % i out1 = 500 ma, v out1 = 7 v 85 i out1 = 100 ma, v out1 = 9 v 75 i out1 = 500 ma, v out1 = 9 v 85 v en1_h enable threshold high v in = 4 to 6 v 1.2 v v en1_l enable threshold low v in = 4 to 6 v 0.4 i en1 enable pin current v en1 = v in = 5 v 2 a v out1 / v in line transient response (2) v in from 4 to 6 v, i out1 = 500 ma, t r = t f => 30 s, t j = 25 c -5 5 % v out v out1 / i out load transient response (2) v in = 5 v, i out1 from 100 ma to 500 ma, t r = t f => 5s, t j = 25 c -5 5 % v out v out1 / v in startup transient (2) v in from 0 to 5 v, i out1 = 500 ma -10 10 % v out t start startup time v en1 from 0 to 5 v, i out1 =100ma 500 s inrush current v out =9.25 v, i out =100 ma 1.3 a
stodd03 electrical characteristics doc id 018980 rev 1 9/16 step-down section fb 2 feedback voltage t j = 0 to 85 c 3.23 3.3 3.37 v i fb2 fb2 pin bias current v fb2 = 3.5 v 15 20 a i out2 output current (2) (3) v in = 4 to 6 v 700 ma i out_min minimum output current 0 ma v out2 reference load regulation (2) 10 ma < i out2 < 0.5 a 5.5 15 mv pwm f s pwm switching frequency 1.2 mhz %v out2 / v in reference line regulation 4 v < v in < 6 v 0.032 %v out /v in d max maximum duty cycle v fb2 = 3.0 v 85 94 % i swl switching current limitation 1.5 a i lkp2 pmos leakage current v fb2 = 3.5 v, v sw2 = gnd, t j = 0 to 80 c 0.1 a i lkn2 nmos leakage current v fb2 = 3.5 v, v sw2 = 5 v, t j = 0 to 80 c 0.1 a r dson - n nmos switch-on resistance i sw = 250 ma 0.2 r dson - p pmos switch-on resistance i sw = 250 ma 0.3 v out2 / i out2 load transient response (2) 100 ma < i out2 < 500 ma, t r = t f => 100 ns, t j = 25 c -5 +5 %v out efficiency v out = 3.3 v, i out = 100 ma 75 % v out = 3.3 v, i out = 500 ma 85 v en2_h enable threshold high v in = 4 to 6 v 1.2 v v en2_l enable threshold low v in = 4 to 6 v 0.4 i en2 enable pin current v en2 = v in = 5 v 2 a power switch section r dson - p pmos switch-on resistance i sw = 250 ma 0.3 i sw switching operating current 1 a i lksw switching leakage current en_sw = en_sw = h, t j = 0 to 80 c 1a v in_psw input voltage range 4 6 v v en_sw_h enable pins threshold high v in = 4 to 6 v 1.2 v v en_sw_l enable pins threshold low v in = 4 to 6 v 0.4 i en_sw enable pins current v en_sw = v in = 5 v 2 a table 8. electrical characteristics (continued) symbol parameter test conditions min. typ. max. unit
electrical characteristics stodd03 10/16 doc id 018980 rev 1 thermal section t shdn thermal shutdown (2) 130 150 c t hys thermal shutdown hyst. (2) 15 c 1. if v out1 > ovp, the device stops switching. 2. guaranteed by design, but not tested in production. 3. v out = 90% of nominal value table 8. electrical characteristics (continued) symbol parameter test conditions min. typ. max. unit
stodd03 package mechanical data doc id 018980 rev 1 11/16 6 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. table 9. qfn16 (4 x 4 mm) mechanical data dim. mm. min. typ. max. a 0.80 0.90 1.00 a1 0.00 0.02 0.05 a3 0.20 b 0.25 0.30 0.35 d 3.90 4.00 4.10 d2 2.50 2.80 e 3.90 4.00 4.10 e2 2.50 2.80 e0.65 l 0.30 0.40 0.50
package mechanical data stodd03 12/16 doc id 018980 rev 1 figure 4. qfn16 (4 x 4 mm) drawing 7571203_a
stodd03 package mechanical data doc id 018980 rev 1 13/16 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 stodd03 14/16 doc id 018980 rev 1 figure 5. qfn16 (4 x 4 mm) recommended footprint
stodd03 revision history doc id 018980 rev 1 15/16 7 revision history table 10. document revision history date revision changes 30-aug-2011 1 first release.
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