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application notes: an_SY8088 high efficiency 1.5mhz, 1a synchronous step down regulator preliminary specification an_SY8088 rev. 0.1 silergy corp. confidential- prepared for customer use only 1 general description SY8088 is a high efficiency 1.5mhz synchronous step down dc/dc regulator ic capable of delivering up to 1a output current. it can operate over a wide input voltage range from 2.5v to 5.5v and integrate main switch and synchronous switch with very low r ds (on) to minimize the conduction loss. ordering information package code temperature code optional spec code ( ) SY8088 package code temperature code optional spec code ( ) SY8088 temperature range: - 40c to 85c features low r ds(on) for internal switches (top/bottom) 260m ? /170m ? 2.5~5.5v input voltage range 40 a typical quiescent current high light load efficiency high switching frequency 1.5mhz minimizes the external components internal soft-start limits the inrush current 100% dropout operation rohs compliant and halogen free compact package: sot23-5 applications portable navigation device set top box usb dongle media player smart phone typical application efficiency vs. load current load current (ma) 1 10 100 1000 70 75 80 85 90 95 v in =4.2v,v out =1.8v v in =3.3v,v out =1.8v SY8088aac sot23-5 1a
an_SY8088 an_SY8088 rev. 0.1 silergy corp. confidential- prepared for customer use only 2 pinout (top view) (sot23-5) top mark: ld xyz ( device code: ld, x=year code, y=week code, z= lot number code) pin name pin number pin description en 1 enable control. pull high to turn on. do not f loat. gnd 2 ground pin. lx 3 inductor pin. connect this pin to the switchin g node of the inductor. in 4 input pin. decouple this pin to the gnd pin wi th at least 4.7uf ceramic capacitor. fb 5 output feedback pin. connect this pin to the c enter point of the output resistor divider (as shown in figure 1) to program the outpu t voltage: v out =0.6*(1+r 1 /r 2 ).add optional c 1 (10pf~47pf) to speed up the transient response. absolute maximum ratings (note 1) supply input voltage ------------------------------ --------------------------------------------------- ----------------------- 6.0v enable, fb voltage--------------------------------- --------------------------------------------------- ---------------- v in + 0.6v power dissipation, p d @ t a = 25c, sot23-5------------------------------------ --------------------------------------- 0.6w package thermal resistance (note 2) ja --------------------------------------------------- --------------------------------------------------- -------- 170c/w jc --------------------------------------------------- --------------------------------------------------- ---- ----130c/w junction temperature range ------------------------ --------------------------------------------------- -------------------125c lead temperature (soldering, 10 sec.) ------------- --------------------------------------------------- ------------------ 260c storage temperature range ------------------------- --------------------------------------------------- ------- - 65c to 150c recommended operating conditions (note 3) supply input voltage ------------------------------ --------------------------------------------------- -------------- 2.5v to 5.5v junction temperature range ------------------------ --------------------------------------------------- -------- - 40c to 125c ambient temperature range ------------------------- --------------------------------------------------- -------- - 40c to 85c
an_SY8088 an_SY8088 rev. 0.1 silergy corp. confidential- prepared for customer use only 3 electrical characteristics (v in = 5v, v out = 2.5v, l = 2.2uh, c out = 10uf, t a = 25c, unless otherwise specified) parameter symbol test conditions min typ max unit input voltage range v in 2.5 5.5 v quiescent current i q i out= 0 , v fb =v ref 105% 40 a shutdown current i shdn en=0 0.1 1 a feedback reference voltage v ref 0.588 0.6 0.612 v pfet ron r ds(on) , p 260 m ? ?
an_SY8088 an_SY8088 rev. 0.1 silergy corp. confidential- prepared for customer use only 4 typical performance characteristics
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an_SY8088 an_SY8088 rev. 0.1 silergy corp. confidential- prepared for customer use only 5 time (400 s/div) startup from enable (v in =5.0v, v out =1.8v, i load =1.0a) l x 5.0v/div v out 1.0v/div en 5.0v/div i l 1.0a/div ,,,,,,,,,,,,,,,,,,,,,,,,,,, dmo 0ful/tmsn rpt)(0iu)o0t(s f5 ., oidl58005 lad obdn580. vle obdlen v idl5tms 5 lad0000000 bdl5tms t, idl5tms . v bdletms ,,, , ,, , , ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
an_SY8088 an_SY8088 rev. 0.1 silergy corp. confidential- prepared for customer use only 6 operation the SY8088 is a high-efficiency 1.5mhz synchronous step-down dc-dc converters capable of delivering up to 1a output current. it operates over a wide input voltage range from 2.5v to 5.5v and integrates main switch and synchronous switch with very low r ds(on) to minimize the conduction loss. applications information because of the high integration in the SY8088 ic, t he application circuit based on this regulator ic is r ather simple. only input capacitor c in , output capacitor c out , output inductor l and feedback resistors (r1 and r2 ) need to be selected for the targeted applications specifications. feedback resistor dividers r1 and r2 : choose r1 and r2 to program the proper output voltage. to minimize the power consumption under light loads, it is desirable to choose large resist ance values for both r1 and r2. a value of between 100k ? ? ?
an_SY8088 an_SY8088 rev. 0.1 silergy corp. confidential- prepared for customer use only 7 sot23-5 package outline & pcb layout design 2.40 0.80 0.55 0.95 typ 2.40 0.80 0.55 0.95 typ 1.50 - 1.70 0.30 - 0.50 2.80 - 3.10 2.70 - 3.00 1.50 - 1.70 0.30 - 0.50 2.80 - 3.10 2.70 - 3.00 recommended pad layout 0.1 - 0.15 0.25 ref 0.3 - 0.6 0.1 - 0.15 0.25 ref 0.3 - 0.6 1.0 - 1.3 0.01 - 0.1 1.90 typ 0.95 typ 1.0 - 1.3 0.01 - 0.1 1.90 typ 0.95 typ notes: all dimensions are in millimeters. all dimensions dont include mold flash & metal burr.

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