qc 2.0 interface module e - cmos corp. ( www.ecmos.com .tw ) page 1 of 9 5j15 n rev. f001 ec490 24 sop - 8l general description EC49024 is designed to support quick charge qc 2.0 (qc2.0) sp ecifications. it is a low - cost solution to support qc2.0 functions. EC49024 incorporates all necessary functions to add qc 2.0 capability to standard adaptor designs, portable battery designs, and car - charger designs. EC49024 supports the full output volt age range of either class a or class b. optionally class b can be inhibited for protecting the battery charger from accidental damage. EC49024 automatically detects whether a connected powered device (pd) is qc2.0 capable before enabling output voltage ad justment. if a pd that is not compliant to qc2.0 is detected the EC49024 disables output voltage adjustment to ensure safe operation with legacy 5 v only usb pds. features ? fully supports quick charge 2.0 specification ? class a: 5 v, 9 v, and 12 v output voltage ? class b: 5 v, 9 v, 12 v, and 20 v output voltage ? usb battery charging specification revision 1.2 compatible ? automatic usb dcp shorting d+ to d - line ? default 5 v mode operation ? very low power consumption ? less than 1 mw at 5 v output ? fail sa fe operation ? adjacent pin - to - pin short - circuit fault ? open circuit pin fault applications adaptors for smart phones, tablets, netbooks, digital cameras, and blue - tooth accessories portable battery packs supporting qc 2 . 0 functions car c h argers s upporting qc2.0 functions other usb power output ports supporting qc2.0 functions pin configuration
qc 2.0 interface module e - cmos corp. ( www.ecmos.com .tw ) page 2 of 9 5j15 n rev. f001 ec490 24 pin functions no. pin name pin function description 1 gnd ground 2 v1 open drain input of output voltage adjustment switch. active for 9 v, 12 v, and 20 v out put setting. 3 v2 open drain input of output voltage adjustment switch. active for 12 v, and 20 v output setting. 4 v3 open drain input of output voltage adjustment switch. active for 20 v output setting. 5 d - usb d - data line input. 6 d+ usb d+ data line input. 7 r connected to internal band - gap reference. provides reference current through connected resistor. 8 bp connection point for an external bypass capacitor for the internally generated supply voltage. ordering information
qc 2.0 interface module e - cmos corp. ( www.ecmos.com .tw ) page 3 of 9 5j15 n rev. f001 ec490 24 typ ical application functional block diagram
qc 2.0 interface module e - cmos corp. ( www.ecmos.com .tw ) page 4 of 9 5j15 n rev. f001 ec490 24 absolute maximum rating (t a =25 symbol parameter maximum units v bp bypass pin voltage 5 .6 v v r reference pin voltage 5 v v v1/v2/v3 v1/v2/v3 pin voltage v bp v v d+/d - d+/d - pin voltage 5 v i bp bypass pin current 15 ma i v1/v2/v3 v1/v2/v3 pin current 0.5 ma i d+/d - d+/d - pin curre nt 1 ma note v v1/v2/v3 voltage can not over v bp recommended operating conditions symbol parameter maximum units t j operating junction temperature - 2 0 to 1 25 t a operating ambient temperature - 2 0 to 8 5 t s storage temperature - 65 to150 t lea d lead temperature (less than 15 seconds) 260
qc 2.0 interface module e - cmos corp. ( www.ecmos.com .tw ) page 5 of 9 5j15 n rev. f001 ec490 24 electrical characteristics vcc=5v ; tj=25 unless otherwise specified s ymbol parameter t est c onditions m in t yp m ax u nit v bp bypass pin voltage 4 5 v v bp reset power - up reset threshold voltage 3.8 v i bpsc bypass pin source current v bp = 4.3 v, t j = 25 cn1 = n2 = n3 = off 140 a i bp(shunt) bypass pin shunt voltage i bp =3ma 5.0 5.3 5.6 v v r reference pin voltage 1.22 1.27 1.32 v v dat(ref) data detect voltage 0.325 v v sel(r ef) output voltage selection reference 2 v v inh 12 v / 20 v output inhibit threshold v bp - 0. 8 v i dat(short) data lines short - circuit delay vout 0.8 v 18 s t glitch d+ high glitch filter time 1250 ms t glitch(v) change output voltage glitc h filter time 32 ms r dm(dwn) d - pull - down resistance 19.53 r ds(on)n1 switch n1 on - resistance i n1 =200a 300 r ds(on)n 2 switch n 2 on - resistance i n 2 =200a 300 r ds(on)n 3 switch n 3 on - resistance i n 3 =200a 300 r ds(on)n 4 switch n 4 on - res istance i n 4 =200a 300 r dsn5 switch n5 on - resistance i n1 =200 a v d+ 3.6v 40
qc 2.0 interface module e - cmos corp. ( www.ecmos.com .tw ) page 6 of 9 5j15 n rev. f001 ec490 24 typical performance characteristics after connection, d+,d - input= 0.6v d+ form 0.6v rise to 3.3v v1 on. after conne ction d+ d - input= 0.6v d+ from 0.6v rise to 3.3v v1 on d+ from 3.3v drop to 0.6v ,v1/v 2 on after connection d+ d - input= 0.6v;d+ from 0.6v rise to 3.3v v1 on d - from 0.6v rise to 3.3v v1/v2/v3 on
qc 2.0 interface module e - cmos corp. ( www.ecmos.com .tw ) page 7 of 9 5j15 n rev. f001 ec490 24 applications information EC49024 is a low - cost usb high - voltage dedicated charging po rt interface ic for the quick charge 2.0 specification. it incorporates all necessary functions to add quick charge 2.0 capability to standard adaptors, car - chargers, and portable battery packs. EC49024 also supports other solutions with traditional feedba ck schemes like opto - coupler and sec ondary reference regulator ec50431 as depicted in figure 1.EC49024 supports the full output voltage range of quick charge 2.0 class a (5 v, 9 v, or 12 v) or class b (5 v, 9 v, 12 v, or 20 v). it automatically detects eit her quick charge 2.0 capable powered devices (pd) or legacy pds compliant with the usb battery charging specification revision 1.2 and only enables output voltage adjustment accordingly. figure 1. EC49024 with traditional output regulation (cv only). sh unt regulator the internal shunt regulator clamps the bypass pin at 6 v when current is provided through an external resistor (r?bp in figure 1). th is facilitates powering of EC49024 externally over the wide power supply output voltage range of 5 v to 20 v . recommended values are r bp = 4.7 k and c bp = 220 nf. bypass pin undervoltage the bypass pin undervo ltage circuitry resets the EC49024 when the bypass pin voltage drops below 3.9 v. once the bypass pin voltage drops below 3.9 v it must rise back to 4 v to enable correct operation. reference input resister rref at the reference pin is connected to an internal band gap reference and provides an accurate reference current for internal timing circuits. the recommended value is r ref = 127 k.
qc 2.0 interface module e - cmos corp. ( www.ecmos.com .tw ) page 8 of 9 5j15 n rev. f001 ec490 24 quick charg e 2.0 interface at power - up EC49024 turns on switch n5 (see figure 3) in 20 ms or less after the bypass pin voltage has reached 4 v. switch n4 and output switches n1 to n3 remain off. this sets the default 5 v output voltage level. with d+ and d - short - cir cuited the normal handshake between the ac - dc adapter (dcp) and powered devices (pd) as described in the usb battery charging specification 1.2 can commence. after sw itch n5 has been turned on EC49024 starts monitoring the voltage level at d+. if it continuo usly stays at usb cable disconnect the voltage level at d+ above v dat(ref) (typ. 0.325 v) and below v sel(ref) (typ. 2 v) for at least 1.25 seconds EC49024 will enter quick charge 2.0 operation mode. if the voltage at d+ dr ops any time b elow 0.325 v EC49024 resets the 1.25 seconds timer and stays in usb battery charging specification 1.2 compatibility mode with a default output voltage of 5 v. once EC49024 has entered quick charge 2.0 operation mode switch n5 will be turned off. additionally switch n4 is turned on connecting a 19.53 k pull - down resistor to d - . as soon as the voltage at d - has dropped low (< 0.325 v) for at least 1 ms EC49024 starts accepting requests for different ac - dc adapter output voltages by means of applied voltage levels at data lines d+ and d - through the powered device. table 1 summarizes the output voltage lookup table, corresponding ac - dc adapter output voltages and status of switches n1 to n3. for quick charge 2.0 class a support only, the v3 pin has to be connected to the bypass pin (directly or through a resistor up to 100 k). this will inhibit any requests for setting a 20 v output. is pulled down by resistor r dat(lkg) (see figure 1). o nce it drops below 0.325 v ec 49024 will turn on switch n5 (thereby short - circuiting d+ and d - ) and turns off switches n1 to n4. this sets the default output voltage of 5 v. the recommended value for r dat( lkg) = 390 k. v o1 (5v)= v fb *( (r 1 /r 2 ) +1); v o2 (9v)= v fb *((r 1 / r x1 )+1), r x1 =r 2 //r 3 ; v o3 (12v)= v fb *((r 1 / r x2 )+1), r x2 =r x1 //r 4 ; v o4 (20v)= v fb *((r 1 / r x3 )+1), r x3 =r x2 //r 5 ;
qc 2.0 interface module e - cmos corp. ( www.ecmos.com .tw ) page 9 of 9 5j15 n rev. f001 ec490 24 outline drawing sop - 8l 1 2 3 4 5 6 7 8 h e d a1 a b b1 c min max min max a 0.0532 0.0688 1.35 1.75 a1 0.0040 0.0098 0.10 0.25 b 0.0130 0.0200 0.33 0.51 b1 c 0.0075 0.0098 0.19 0.25 d 0.1890 0.1968 4.80 5.00 h 0.2284 0.2440 5.80 6.20 e 0.1497 0.1574 3.80 4.00 dimensions 0.050 bsc 1.27 bsc dim n inches mm
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