sy8008a/sy8008b/sy8008c high efficiency 1.5mhz, 0.6a/1a/1.2a synchronous step down regulator preliminary spec sy8008rev. # 0.91 silergy corp. confidentia l- prepared for internal use only 1 general description the sy8008a, sy8008b and sy8008c are high- efficiency 1.5mhz synchronous step-down dc-dc regulator ics capable of delivering up to 1.2a outp ut currents. the sy8008 family operate over a wide inp ut voltage range from 2.5v to 5.5v and integrate main switch and synchronous switch with very low rds(on) to minimize the conduction loss. low output voltage ripple and small external induct or and capacitor sizes are achieved with 1.5mhz switching frequency. this along with small sot- 23/tsot-23 footprint provides small pcb area application. applications portable navigation device smart phone usb dongle set top box media player features low rds(on) for internal switches (top/bottom) o sy8008a: 300m /250m , 0.6a o sy8008b: 250m /200m , 1a o sy8008c: 200m /150m , 1.2a 2.5-5.5v input voltage range 1.5mhz switching frequency minimizes the external components internal softstart limits the inrush current 100% dropout operation rohs compliant and halogen free compact package: sot23-5/ tsot23-5 pin ordering information temperature code c: -40 c~85 c package code: aa:sot23-5 ac:tsot23-5 spec code sy8008 ( ) typical applications lx in gnd fb en v in c in l r 1 r 2 v out c out c 1 (opt.) figure 1 figure 2. efficiency v s load current
sy8008a/sy8008b/sy8008c sy8008rev. # 0.91 silergy corp. confidentia l- prepared for internal use only 2 pinout (top view) en gnd lx in fb 12 3 54 en gnd lx in fb 12 3 54 (sot23-5, tsot23-5) top mark: aa xyz for sy8008aaac, ab xyz for sy8008baac, ac xyz for sy8008caac, bi xyz for SY8008AACC, bg xyz for sy8008bacc (device code: aa for sy8008aaac, etc., 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 inductor in 4 input pin. decouple this pin to gnd pin with a t least 1uf ceramic cap 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 output voltage: vout=0.6*(1+r1/r2).add optional c 1 (10p-47pf) to speed up 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, tsot23-5 ------------------------- ---------- 0.4w package thermal resistance (note 2) sot23-5, tsot23-5, ja --------------------------------------------------- -------------- 250c/w sot23-5, tsot23-5, jc --------------------------------------------------- -------------- 130c/w junction temperature range ------------------------ ------------------------------------------------ 15 0c lead temperature (soldering, 10 sec.) ------------- ----------------------------------------------- 260 c storage temperature range ------------------------- ----------------------------------------------- - 65c to 150c esd susceptibility (note 2) hbm (human body mode) ----------------------------- ------------------------------------------- 2kv mm (machine mode) --------------------------------- ---------------------------------------------- 200 v 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
sy8008a/sy8008b/sy8008c sy8008rev. # 0.91 silergy corp. confidentia l- prepared for internal use only 3 electrical characteristics (v in = 3.6v, v out = 2.5v, l = 2.2uh, c out = 10uf, t a = 25c, i max = 1a unless otherwise specified) parameter symbol test conditions min typ max unit input voltage range vin 2.5 5.5 v shutdown current i shdn en=0 0.1 1 a feedback reference voltage vref 0.588 0.6 0.612 v fb input current ifb vfb=vin -50 50 na sy8008a 0.3 sy8008b 0.25 pfet ron rds(on),p sy8008c 0.2 sy8008a 0.25 sy8008b 0.2 nfet ron rds(on),n sy8008c 0.15 sy8008a 0.8 a sy8008b 1.2 a pfet current limit i lim sy8008c 1.5 a en rising threshold venh 1.5 v en falling threshold venl 0.4 v input uvlo threshold v uvlo 2.5 v uvlo hysteresis v hys 0.1 v oscillator frequency f osc iout=100ma 1.5 mhz min on time 50 ns max duty cycle 100 % thermal shutdown temperature t sd 160 c note 1 : stresses listed as the above absolute maximum ra tings may cause permanent damage to the device. these are for stress ratings. functional operation of the device at these or any other conditions beyo nd those indicated in the operational sections of the specif ications is not implied. exposure to absolute maxim um rating conditions for extended periods may remain possibil ity to affect device reliability. note 2 : ja is measured in the natural convection at ta = 25 c on a low effective single layer thermal conductivity test board of jedec 51-3 thermal measu rement standard. pin 2 of sot-23-5/tsot-23-5 packag es is the case position for jc measurement. note 3. the device is not guaranteed to function outside it s operating conditions.
sy8008a/sy8008b/sy8008c sy8008rev. # 0.91 silergy corp. confidentia l- prepared for internal use only 4 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 bu rr.
sy8008a/sy8008b/sy8008c sy8008rev. # 0.91 silergy corp. confidentia l- prepared for internal use only 5 tsot23-5 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 0.3 - 0.6 0.1 - 0.20 0.25 ref 1.00 (max) 0.01 - 0.1 1.90 typ 0.95 typ notes: all dimensions are in millimeters. all dimensions dont include mold flash & metal bu rr.
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