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________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 1 / 13 um3510 1a, 2.2 5 mhz, synchronous step - down dc - dc converter um3510s sot23 - 6 um 3510da dfn6 2.02.0 general description the um 3510 is a high efficiency pulse - width - modulated ( pwm) synchronous step - down dc - dc converter with an i nput voltage range of 2.5v to 6.0v. it provides up to 1000ma output current from a single li - i on cell. the um 3510 operates at 2.25mhz fixed switching frequency and enters power save mode to maintain high efficiency at light load condition. for low noise ap plications , the device can be forced into fi x ed frequency pwm mode by pulling the mode pin high. the um 3510 enter s shutdow n mode and consumes less than 1 a when en pin is pulled low. other features include lower internal reference voltage with 2% accuracy, over temperature protection and over current protection. the um 3510 is available in sot23 - 6 and 2mm 2mm 6 - pin dfn package s . applications features ? cellular and smart phones ? microp rocessors and dsp core supplies ? wireless and dsl modems ? pdas, gps ? wlan ? portable instruments ? high efficiency: up to 9 5 % ? 2.2 5 mhz constant switching frequency ? 10 00ma output current ? integrated main s witch and s ynchronous r ectifier. no schottky diode required . ? 2.5v to 6.0 v input voltage range ? low quiescent current: 5 6 a ? thermal fault protection ? <1a shutdown current typical application circuit pin configurations top view m: month code um3510s sot23 - 6 u m 3 5 1 0 v i n e n g n d m o d e s w f b v i n 2 . 5 v t o 6 v c i n 1 0 f l 1 2 . 2 h r 1 3 6 0 k r 2 1 8 0 k c 1 2 2 p f c o u t 1 0 f v o u t 1 . 8 v , 1 0 0 0 m a e n f b v i n m o d e g n d s w 1 2 3 4 5 6 u c b m 1 2 3 4 5 6
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 2 / 13 um3510 pin configurations top view (top view) m : month code UM3510DA dfn6 2.02.0 o rdering information part number packaging type marking code s hipping qty um3510s sot23 - 6 ucb 3000pcs/7inch tape & ree l UM3510DA dfn6 2.02.0 aah pin description pin number symbol function 1 sw p ower switch output. it is the switch no de connection to the i nductor. this pin connects to the drains of the internal p - ch and n - ch mosfet switches. 2 mode mode pin=high fo rces the device to operate in fixed - frequency pwm mode. mode pin=low enables the power save mode with automatic transition from pfm mode to fixed - frequency pwm mode. 3 fb feedback input pin. connect fb to the center point of the external resistor divider. 4 en r e g u l a t o r e n a b l e c o n t r o l i np u t . pulling this pin to high enables t h e device . pulling this pin to l ow forces the device into s hu t d o w n mode . this pin must be terminated. 5 vin input voltage. 6 gnd ground. 1 2 3 s w m o d e f b 6 5 4 g n d v i n e n e x p o s e d t h e r m a l p a d a a h m
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 3 / 13 um3510 absolute maximum ratings (note 1) s ymbo l p arameter v alue u nit v in input voltage - 0.3 to + 7 .0 v v en ,v fb en , fb voltage s - 0.3 to v in +0.3 v v sw sw voltage - 0.3 to v in +0.3 v i sw peak sw sink and source current 2.0 a t o operating temperature - 40 to + 85 c t stg storage temperature range - 65 to + 150 c note 1: stresses greater than those listed under m aximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation al sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability.
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 4 / 13 um3510 electrical characteristics (v in =v en =3.6v, t a =+25 oc , unless otherwise noted) symbol parameter test c onditions m i n t yp m ax u nit s upply v in input voltage range 2.5 6.0 v uvlo under voltage lockout threshold falling edge 1.8 2.3 v uvlo_hys under voltage lockout hysteresis 200 mv i q input dc supply current (m ode =gnd ) i load =0 m a 56 80 a load =0 m a 5.6 ma i sd input supply current (shutdown mode) v fb =0v, v in = 6.0 v 0. 1 1.0 a output v fb regulated feedback voltage t a = +25oc 0.588 0.600 0.612 v i fb fb input bias current v fb =0.65v 30 na output voltage line regulation 2.5v in out =10 ma, m ode =v in /gnd 0.1 0 0. 2 0 %/v output voltage load regulation 0.1 ai out o(m ax) maximum output current 1000 ma t s s soft start time 4 00 swl sw leakage v en =0v, v in = 6 v , v sw =0v or 6 v 0.01 1 a power switch r ds(on) r ds(on) of p - ch mosfet v in =3.6v, i sw =100ma 0. 25 0. 30 ds(on) of n - ch mosfet v in =3.6, i sw = - 100ma 0. 18 0. 23 p peak inductor current v in = 2.5v to 6.0v 1.6 1.8 2.0 a thermal shutdown temp erature 1 5 0 oc thermal shutdown temp erature h ysteresis 2 0 oc osillator f oscillator frequency 1.95 2.25 2.55 mhz enable, mode v ih high - level threshold 1. 2 v v il low - level threshold 0.4 v i i input leakage current 0.1 1 a
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 5 / 13 um3510 typical operating characteristics efficiency vs. load current v out =1.8v, power save mode v in =2.5v v in =3.6v v in =4.2v v in =6.0v v in =2.5v v in =3.6v v in =4.2v v in =6. 0v v in = 3.6 v v in = 4.2 v v in =6.0v v in = 3.6 v v in = 4.2 v v in =6.0v efficiency vs. load current v out =1.8v, forced pwm mode efficiency vs. load current v out =3.3v, power save mode efficiency vs. load current v out =3.3v, forced pwm mode output voltage vs. load current v out =1.8v, mode= l v in =2.5v v in =3.6v v in =4.2v v in =6.0v v in =2.5v v in =3.6v v in =4.2v v in =6.0v output voltage vs. load current v out =1.8v, mode =h v in =2.5v v in =3.6v v in =4.2v v in =6.0v 1.810 1.815 1.820 1.825 1.830 1.835 1.840 1 10 100 1000 output voltage (v) output current (ma) output voltage vs . load current vout =1.8v,mode=l vin=2.5v vin=3.6v vin=4.2v vin=6.0v 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 ef f iciency (%) output current ( ma ) efficiency vs . load current vout =1.8v, power save mode vin=2.5v vin=3.6v vin=4.2v vin=6.0v 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 ef f iciency (%) output current (ma) efficiency vs . load current vout =3.3v, power save mode vin=3.6v vin=4.2v vin=6.0v 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 ef f iciency (%) output current (ma) efficiency vs . load current vout =1.8v, forced pwm mode vin=2.5v vin=3.6v vin=4.2v vin=6.0v 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 ef f iciency (%) output current (ma) efficiency vs . load current vout =3.3v, forced pwm mode vin=3.6v vin=4.2v vin=6.0v 1.810 1.815 1.820 1.825 1.830 1.835 1.840 1 10 100 1000 output voltage (v) output current (ma) output voltage vs. load current vout =1.8v,mode=h vin=2.5v vin=3.6v vin=4.2v vin=6.0v
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 6 / 13 um3510 typical operating characteristics (continued) supply current vs. supply voltage forced pwm mode, mode=h supply current vs. supply voltage power save mode, mode=l output voltage vs. load current v out =3.3v, mode=l output voltage vs. load current v out =3. 3v, mode=h v in = 4.2 v v in =6.0v v in = 4.2 v v in =6.0v output voltage vs. temperature v in =3.6v, mode=l, i load =10ma output voltage vs. temperature v in =3.6v, mode=h, i load =10ma 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 1 10 100 1000 output voltage (v) output current ( ma ) output voltage vs . load current vout =3.3v, mode=l vin=4.2v vin=6.0v 3.270 3.280 3.290 3.300 3.310 3.320 3.330 3.340 1 10 100 1000 output voltage (v) output current (ma) output voltage vs . load current vout =3.3v, mode=h vin=4.2v vin=6.0v 1.795 1.800 1.805 1.810 1.815 1.820 1.825 - 40 - 15 10 35 60 85 output voltage ( v) temperature ( c ) output voltage vs. temperature vin=3.6v, mode=l, iload =10ma 1.795 1.800 1.805 1.810 1.815 1.820 1.825 - 40 - 15 10 35 60 85 output voltage ( v) temperature ( c ) output voltage vs. temperature vin=3.6v, mode=h, iload =10ma 20 30 40 50 60 70 80 2.5 3 3.5 4 4.5 5 5.5 6 supply current ( supply current vs. supply voltage power save mode, mode=l 0 2 4 6 8 10 2.5 3 3.5 4 4.5 5 5.5 6 supply current ( ma ) supply voltage ( v) supply current vs. supply voltage forced pwm mode, mode=h
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 7 / 13 um3510 typical operating characteristics (continued) supply current vs. temperature v in =6v, mode=l frequency vs. supply voltage v out =1.8v, i load =200ma h - side r ds(on) vs. input voltage l - side r ds(on) vs. input voltage 40 45 50 55 60 65 70 - 50 - 25 0 25 50 75 100 125 supply current ( supply current vs. temperature vin=6v, mode=l 1900 2000 2100 2200 2300 2400 2500 2600 2.5 3 3.5 4 4.5 5 5.5 6 frequency ( khz) supply voltage (v ) frequency vs. supply voltage vout =1.8v, iload =200ma 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 r ds(on) ( ?) h - side rds(on) vs. input voltage 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 2.5 3.0 3.5 4.0 4.5 5.0 r ds(on) ( ? ) input voltage ( v) l - side rds(on) vs. input voltage
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 8 / 13 um3510 typical operating characteristics (continued) load transient response v out i load 200mv/div 500ma/div 100s/div i load =50ma i load =850ma i load =50ma v in = 2.5v, v out =1.8v, mode=l l oad transient response v out i load 200mv/div 500ma/div 100s/div i load =50ma i load =850ma i load =50ma v in =2.5v, v out =1.8v, mode=h line transient response v in v out 2.0v/div 20mv/div 100s/div v in =3.5v to 4.5v, v out =1.8v, i load =50ma, mode=l line transient response v in v out 2.0v/div 20mv/div 100s/div v in =3.5v to 4.5v, v out =1.8v, i load =50ma, mode=h pfm mode operation v out v sw 20mv/div 2.0v/div 5 0s/div v in =3.6v, v out =1.8v, i load =10ma, mode=l pwm mode operation v out v sw 20mv/div 2.0v/div 1. 0s/div v in =3.6v, v out =1.8v, i load =10ma, mode=h
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 9 / 13 um3510 application information output voltage setting the output voltage can be caculated according to the formula below with an internal reference volatge v ref typical 0.6v : v out = v ref 1 + r 1 r 2 to minimize the current through the feedback divider network, the recommended value of r2 is about 180k . the sum of r1 and r2 should not exceed about 1m to keep the network robust against noise . an external feed forward capacitor c1 is required for optimum load transient response. the value of c1 should be in the range between 10pf and 33pf. route the fb line away from noise sources, such as the inductor or the sw line. inductor selection a 1h to 10h inductor with dc current rating a t least 25% higher than the maximum load current is recommended for most applications. for best efficiency, the inductor dc resistance shall be <200m?. for most designs, the inductance value can be derived from the following equation: l = v out v in ? v out v in ? i l f osc where ?i l is the inductor ripple current. choose inductor ripple current approximately 30% of the maximum load cur rent, 10 00ma. the maximum inductor peak current is: i l max = i load + ? i l 2 the following table is a list of recommended inductors. list of recommended inductors dimension [mm 3 ] inductor type supplier 4.5 4 3.2 744773022 wrth elektronik 3 3 1.5 lqh3npn2r2nm0 murata 3 3 1.5 lps3015 coilcraft input capacitor selection the input capacitor reduces the surge current drawn from the input and switching noise from the device. the input capacitor impedance at the switching frequency shall be less tha n the input source impedance to prevent high frequency switching current passing to the input. ceramic capacitors with x5r or x7r dielectrics are highly recommended because of their low esr and small temperature coefficients. for most applications, a 10 f capacitor is sufficient. the input capacitor can be increased without any limit for better input voltage filtering. output capacitor selection the output capacitor keeps output voltage ripple small and ensures regulation loop stable. the output capacitor impedance shall be low at the switching frequency. ceramic capacito r with x5r or x7r dielectrics are recommended. the output ripple ?v out is approximately: ? v out v out v in ? v out v in f osc l esr + 1 8 f osc c out
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 1 0 / 13 um3510 layout guidance when laying out the pc board, the following suggestions should be take n to ensure proper operation of the um 3510 . 1. the power traces, including the gnd trace, the sw trace and the vin trace should be kept short, direct and wi de to allow large current flow. 2. connect the input capacitor c in to the vin pin as closely as possible to get good power filter effect. 3. keep the switching node, sw, away from the sensitive fb node. 4. do not trace signal line under inductor.
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 11 / 13 um3510 package information um3 510 s: sot23 - 6 outline drawing dimensions symbol millimeters inch es min max min max a 1.05 1.25 0.041 0.049 a1 0.00 0.10 0.000 0.004 a2 1.05 1.15 0.041 0.045 b 0.30 0.50 0.012 0.020 c 0.10 0.20 0.004 0.008 d 2.82 3.02 0.111 0.119 e 1.50 1.70 0.059 0.067 e1 2.65 2.95 0.104 0.116 e 0.95 ref 0.037ref e1 1.80 2.0 0 0.071 0.079 l 0.60ref 0.023ref l 1 0.30 0.60 0.012 0.024 0 8 0 8 land pattern notes: 1. compound dimension: 2.92 1 .60 2. unit: mm; 3. general tolerance 0.0 5 mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation e 1 b d e e 1 e 1 2 3 4 5 6 t o p v i e w e n d v i e w s i d e v i e w 0 . 2 0 0 . 7 0 . 9 0 . 9 5 0 . 9 5 2 . 4 m u c b
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 12 / 13 um3510 um 3510 da dfn6 2.0 2.0 outline drawing dimensions symbol millimeters inches min typ max min typ max a 0.57 - 0.80 0.022 - 0.031 a1 0.00 - 0.05 0.000 - 0.002 a 3 0.20ref 0.008ref b 0.25 0.30 0.35 0.01 0 0.012 0.014 d 1.95 2.00 2.075 0.077 0.079 0.082 d2 1.05 - 1.75 0.041 - 0.069 e 1.95 2.00 2.075 0.077 0.079 0.082 e 2 0.45 - 1.06 0.018 - 0.042 e 0.65bsc 0.026bsc l 0.25 - 0.45 0.010 - 0.018 land pattern notes: 1. compound dimension: 2.00 2. 0 0 2. unit: mm; 3. general tolerance 0.0 5 mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation d e p i n 1 d o t b y m a r k i n g t o p v i e w d 2 b e e 2 l b o t t o m v i e w a a 3 s i d e v i e w p i n # 1 i d a 1 0 . 3 5 0 . 6 5 0 . 2 5 2 . 0 0 2 . 5 0 2 . 0 0 0 . 9 6 1 . 6 5 0 . 5 7 a a h m
________________________________________________________________________ http://www.union - ic.com rev.0 1 jan . 20 1 6 13 / 13 um3510 green compliance union semiconductor is committed to environmental excellence in all aspects of its operations including meeting or exceeding regulatory requirements with respect to the use of hazardous substances. numerous successful programs have been implemented to reduce the use of hazardous substanc es and/or emissions. all union components are compliant with the rohs directive, which helps to support customers in their compliance with environmental directives. for more green compliance information, please visit: http://www.union - ic.com/index.aspx?cat_code=rohsdeclaration important notice the information in this document has been carefully reviewed and is believed to be accurate. nonetheless, this document is subject to chang e without notice. union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contained information, or to notify a person or organization of any update. union reserv es the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. union semiconductor, inc add: unit 606, no.570 shengxia road, shanghai 2012 10 tel: 0 21 - 5109 3966 fax: 021 - 51026018 website: www.union - ic.com

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