1/16 XCL211/xcl212 series 2.0a inductor built-in step-down ?micro dc/dc? converters greenoperation compatible etr28006-001 XCL211b082dr /xcl212b082dr typical performance characteristics typical application circuit general description the XCL211/xcl212series is a synchronous step-down micro dc/dc converter which integrates an inductor and a control ic in one tiny package (3.1mm 4.7mm, h=1.3mm). an internal coil simplifies the circuit an d enables minimization of noise and other operational trouble due to the circuit wiri ng. a wide operating voltage range of 2.7v to 6.0v enables support fo r applications that require an externally set output voltage c an be selected. the XCL211/xcl212 series uses synchronous rectif ication at an operating freque ncy of 2.4mhz. pwm control (XCL211) or automatic pwm/pfm switch ing control (xcl212) can be selected. the XCL211 series has a fixed frequency, enabling the suppression of output ripple. the xcl212 series achi eves high efficiency while holding down output ripple across t he full range of loads, from light to heavy, enabl ing the extension of battery operation time. the series have a high speed soft-start as fast as 1ms in ty pical for quick turn-on. with the built-in uvlo (under voltage lock out) function, the internal p-channel driver transistor is forc ed off when input voltage becomes 2.4v or lower. it?s suitable f or large-current application due to limit current is configured 4.0a in typical. the integrated c l discharge function which enables the electric charge at the output capacitor c l to be discharged via the internal discharge switch located between the lx and gnd pins. due to c l discharge function, malfunction on lx is prevented when stand-by mode. features package size : 3.1mm 4.7mm, h=1.3mm input voltage : 2.7v 6.0v output voltage : 0.9v v in (fb voltage=0.8v 2%) high efficiency : 94% (v in =5.0v, v out =3.3v) output current : 2.0a oscillation frequency : 2.4mhz ( 15%) maximum duty cycle : 100% control methods : pwm (XCL211) pwm/pfm (xcl212) functions : current limit circuit (automatic return) soft-start circuit built-in c l discharge, uvlo output capacitor : low esr ceramic capacitor operating ambient temperature : -40 +85 package : usp-11b01 environmental friendly : eu rohs compliant, pb free applications note pcs printers tablet pcs pnd(portable navigation device) ? 0 20 40 60 80 100 0.1 1 10 100 1000 10000 efficiency : effi (%) output current : i out (ma) XCL211 xcl212 v in =5.0v v out =3.3v
2/16 XCL211/xcl212 series ce/b error amp. vref with soft start, ce current feedback current limit pwm comparator uvlo uvlo cmp ramp wave generator osc lx fb ce control logic inductor gnd l2 l1 pwm/pfm selector pv in av in phase compensation r2 r1 thermal shutdoun synch buffer drive logic ce block diagram XCL211/xcl212 series (usp-11b01) * the XCL211 offers a fixed pwm control, a control logic of pwm/pfm selector is fixed at ?pwm? internally. the xcl212 control scheme is a fixed pwm/pfm automatic switching, a control logic of pwm/pfm selector is fixed at ?pwm/pfm auto matic switching? internally. diodes inside the circuit are an esd pr otection diode and a parasitic diode. product classification ordering information XCL211 ????? fixed pwm xcl212 ????? pwm/pfm auto switching designator item symbol description type b refer to selection guide ? reference voltage 08 reference voltage is fixed at 0.8v oscillation frequency 2 2.4mhz ? (*1) package (order unit) dr usp-11b01 (*2) (1,000pcs/reel) (*1) halogen free and eu rohs compliant. (*2) the usp-11b01 reels are shipped in a moisture-proof packing. selection guide type soft-start time chip enable current limiter thermal shutdown uvlo c l auto- discharge b fixed yes yes yes yes yes
3/16 XCL211/xcl212 series pin configuration pin assignment pin number pin name functions 1 nc no connection 2 lx switching output 3 lx switching output 4 nc no connection 5 fb output voltage monitor 6 ce chip enable 7 av in analog input 8 gnd ground 9 pv in power input 10 l1 inductor electrodes 11 l2 inductor electrodes ce pin function pin name signal status ce low stand-by high active * please do not leave the ce pin open. absolute maximum ratings ta = 2 5 all voltages are described based on the ground voltage of gnd. (*1) please connect pv in pin (no.9) and av in pin (no.7) for use. (*2) the maximum value should be either +7.0 or v pvin +0.3 in the lowest. (*3) it is measured when the two lx pins (no.2 and 3) are tied up to each other. parameter symbol ratings unit pvin pin voltage v pvin -0.3 ~ +7.0 (*1) v avin pin voltage v avin ce pin voltage v ce -0.3 ~ +7.0 v fb pin voltage v fb -0.3 ~ +7.0 v lx pin voltage v lx -0.3 ~ +7.0 or v pvin +0.3 (*2) v lx pin current i lx 6.0 (*3) a power dissipation usp-11b01 pd 1000 mw operating ambient temper ature topr -40 ~ +85 storage temperature t stg -55 ~ +125 usp-11b01 (bottom view) * please connect the av in pin (no.7) and the pv in pin (no.9) when operating. * please connect the l x pins (no.2 and no.3). nc lx lx nc fb ce gnd av in pv in
4/16 XCL211/xcl212 series electrical characteristics XCL211b082dr/xcl212b082dr, ta=25 parameter symbol conditions min. typ. max. unit circuit fb voltage v fb v in =5.0v, v ce =5.0v voltage to start oscillation while v fb =0.72v 0.88v 0.784 0.800 0.816 v operating voltage range v in when connected to external components 2.7 - 6.0 v maximum output current i outmax v in =v ce =5.0v (*1,*2) when connected to external components 2.0 - - a uvlo voltage v uvlo v ce =5.0v, v fb =0.72v voltage which lx pin holding ?l? level (*3) 2.00 - 2.68 v quiescent current iq v in =v ce =5.0v, v fb =0.88v - 53 92 a stand-by current i stb v in =5.0v, v ce =0v, v fb =0.88v - 0.01 1.00 a oscillation frequency f osc v in =v ce =5.0v, i out =300ma when connected to external components 2040 2400 2760 khz pfm switch current (*4) i pfm v in =v ce =6.0v, i out =1ma when connected to external components - 680 - ma pfm duty limit (*4) dty limit_pfm v in =v ce =2.7v, i out =1ma when connected to external components - 180 250 % maximum duty cycle d max v in =v ce =5.0v, v fb =0.72v 100 - - % minimum duty cycle d min v in =v ce =5.0v, v fb =0.88v - - 0 % lxsw?h?on resistance r lxh v in =v ce =4.0v, v fb =0.72v (*6) - 0.11 0.21 ? lxsw?l?on resistance r lxl - 0.12 0.30 (*7) ? - lxsw?h? leakage current i leakh v in =5.0v, v ce =0v, v fb =0.88v, v lx =0v - 0.01 1.00 (*8) a current limit i lim v in =v ce =5.0v, v fb =0.72v (*9) - 4.0 - a output voltage temperature characteristics ? v out / ( ? topr ? v out ) i out =100ma -40 Q topr Q 85 when connected to external components - 100 - ppm/ ce ?h? voltage v ceh v in =5.0v, v fb =0.72v applied voltage to v ce voltage changes lx to ?h? level 1.2 - v in v ce ?l? voltage v cel v in =5.0v, v fb =0.72v applied voltage to v ce voltage changes lx to ?l? level gnd - 0.4 v ce ?h? current i ceh v in =5.0v, v ce =5.0v, v fb =0v -0.1 - 0.1 a ce ?l? current i cel v in =5.0v, v ce =0v, v fb =0v -0.1 - 0.1 a fb ?h? current i fbh v in =5.0v, v ce =0v, v fb =5.0v -0.1 - 0.1 a fb ?l? current i fbl v in =5.0v, v ce =0v, v fb =0v -0.1 - 0.1 a soft-start time t ss v in =5.0v, v ce =0v 5.0v, i out =1ma when connected to external components 0.3 1.0 2.0 ms thermal shutdown temperature t tsd - 150 - - hysteresis width t hys - 20 - - c l discharge resistance r dchg v in =5.0v, v ce =0v, v fb =0.72v, v lx =1.0v 80 130 160 ? inductance l test freq.=1.0mhz - 1.5 - h - inductor rated current i dc ? t=+40 - 2.3 - a - external components: c in1 =20 f(ceramic), c in2 =1 f(ceramic), c l =20 f(ceramic), r1=15k ? , r2=30k ? , c fb =1000pf condition: unless otherwise stated,?h?= v in ~ v in - 1.2v, ?l?= + 0.1v ~ -0.1v (*1) mount conditions affect heat dissipation. ma ximum output current is not guaranteed when t tsd starts to operate earlier. (*2) when the difference between the input and the output is small, so me cycles may be skipped completely before current maximizes. if current is further pulled from this state, output vo ltage will decrease because of p-ch driver on resistance. (*3) these values include uvlo detect voltage, uvlo re lease voltage and hysteresis operating voltage range. uvlo release voltage is defined as the v in voltage which makes lx pin ?h?. (*4) XCL211 series exclude i pfm and dty limit_pfm because those are only for th e pfm control?s functions. (*5) on resistance = (v in ? lx pin measurement voltage) / 0.1a (*6) design value (*7) when temperature is high, a current of approximately 20 a (maximum) may leak. (*8) current limit denotes the level of detection at peak of coil current.
5/16 XCL211/xcl212 series test circuits < circuit no. > < circuit no. > < circuit no. > < circuit no. > < circuit no. > < circuit no. > external components c in1 20fceramic c in2 1fceramic c l 20fceramic r1 15k r2 30k c fb 1000pfceramic l 1.5h(selected goods) v ce v in a l wave form measure point lx pvin gnd fb avin ce l1 l2 c fb v a r1 r2 c l i out c in2 c in1 v ce v in a lx pvin gnd fb avin ce l1 l2 1f v fb v ce v in lx pvin gnd fb avin ce l1 l2 1f v fb 200 wave form measure point v ce v in lx pvin gnd fb avin ce l1 l2 1f v fb il wave form measure point v ce v in lx pvin gnd fb avin ce l1 l2 1f v fb i leakh a i fb h a i fb l a i ceh i cel a v ce v in lx pvin gnd fb avin ce l1 l2 1f v fb il a v v lx
6/16 XCL211/xcl212 series typical application circuit note: the integrated inductor can be used only for this dc/dc conver ter. please do not use this inductor for other reasons. external components value product number c in1 c l 10v/10 f lmk212abj106kg (taiyoyuden) lmk212ab7106mg (taiyoyuden) c2012jb1a106k125ac (tdk) c2012x7r1a106k125ac (tdk) 10v/22 f lmk212bbj226mg (taiyoyuden) c2012jb1a226m125ab (tdk) c in2 16v/1 f emk107bj105ka (taiyoyuden) emk107b7105ka (taiyoyuden) c1005jb1c105k050bc (tdk) c1005x5r1c105k050bc (tdk) c1608x7r1c105k080ac (tdk) |