ap1604a pwm/pfm dual mode step-down dc/dc converter ap1604a rev. 2 1 of 7 february 2009 www.diodes.com ? diodes incorporated lead-free ? input voltage range: 2.2v~5.5v (v out type) ? oscillator frequency: 600khz (typ.) ? internal reference: 1.0v (typ.) ? high efficiency: 93% (typ.) ? stand-by capability: i stb =2a. (typ.) ? soft-start time set-up externally type possible ? current limit and thermal shutdown protection ? lead free package: sot25 ? sot25: available in ?green? molding compound (no br, sb) ? lead free finish/ rohs compliant (note 1) the ap1604a series are multi-functional step-down dc/dc converters with built-in speed, low on resistance drivers. it is capable to deliver more than 800ma output current with external coil, diode and capacitor. output voltage is set-up by the external resistors. (2.5% accuracy). the 600khz ap1604a that can work out with small value external components comes out more compact board. the device switches to and works under pfm mode with light loads. it keeps at high efficiency for both light loads and large output current. ap1604a can be soft-start with a proper capacitor connected between ce/ss pin and ground. the stand-by current is less than 2ua when ce/ss pin is at ?low? status. the device is forced to switch off as the voltage at that pin is lower than the stipulated voltage. applications ? electronic information organizers ? palmtops ? cellular and portable phones ? portable audio systems ? various multi-function power supplies ordering information ap1604a w x - 7 packing package lead free w : sot25 7 : tape & reel l : lead free g : green device package code packaging (note 2) 7? tape and reel quantity part number suffix ap1604awl-7 w sot25 3000/tape & reel -7 AP1604AWG-7 w sot25 3000/tape & reel -7 notes: 1. eu directive 2002/95/ec (rohs). all applicable rohs exemptions applied. please visit our website at http://www.diodes.com/products/lead_free.html . 2. pad layout as shown on diodes inc. suggested pad layout document ap02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf . features general description
ap1604a pwm/pfm dual mode step-down dc/dc converter ap1604a rev. 2 2 of 7 february 2009 www.diodes.com ? diodes incorporated pin assignment 1 3 2 5 4 ce/ss v out v cc gnd sot25 fb (top view) ap1604a pin description block diagram phase compensation vref with ce + - pwm/pfm controller + - ramp wave generator, osc v out ce/ss gnd v cc pwm comparator fb current limit soft start err amp sv cc pin name description v out output voltage gnd ground v cc input supply ce/ss chip enable / soft start fb feedback pin
ap1604a pwm/pfm dual mode step-down dc/dc converter ap1604a rev. 2 3 of 7 february 2009 www.diodes.com ? diodes incorporated absolute maximum ratings (t a =25c) symbol parameter ratings units v cc /sv cc v in pin voltage -0.3 ~ 6.5 v v out v out pin voltage -0.3 ~ v in +0.3 v v fb fb pin voltage -0.3 ~ v in +0.3 v v ce/ss ce/ss pin voltage -0.3 ~ v in +0.3 v p d continuous total power dissipation internal limited t op operating ambient temperature -25 ~ +80 c t st storage temperature range -40 ~ +125 c electrical characteristics v in = 5v, v out 2v, load = 300ma, t a = 25c sym. parameter conditions min typ. max units v fb fb 0.975 1.0 1.025 v v in input voltage 2.2 - 5.5 v line regulation v in = 2.2 ~ 5.5v, load = 10ma - - 0.12 % load regulation i out = 10 ~ 800ma - - 1.2 % v uvlo uvlo voltage min. operating voltage v cc , voltage required to maintain h at v out - - 2 v i cc operating current ce/ss = v in , no load - 100 150 a i ccq supply current no external components, ce/ss = v in , v fb = 1.2v - 90 120 a i stb stand-by current no external components, ce/ss = 0v, v fb = 0v - 2 - a i cl current limit peak current v in = 5v, v out = 2v 800 1000 1200 ma fosc oscillator frequency load = 300ma, v in = 5v, v out = 2v 500 600 700 khz maxdty maximum duty ratio 85 90 - % pfmdty pfm duty ratio no load 15 25 35 % v ceh ce/ss ?high? voltage apply 1.4v (min.) to ce/ss, determine v out ?high? 1.4 - - v v cel ce/ss ?low? voltage same as v ceh , determine v out /?low? - - 0.6 v effi efficiency v cc = 5v, v out = 3.3v, load = 300ma - 93 - % rdson rdson condition i out = 300ma, v in = 5v, v out = 2v - 350 450 m ?
ap1604a pwm/pfm dual mode step-down dc/dc converter ap1604a rev. 2 4 of 7 february 2009 www.diodes.com ? diodes incorporated typical performance characteristics v cc vs. operating current v cc vs. quiescent current 0 20 40 60 80 100 120 140 160 180 200 2.5 3 3.5 4 4.5 5 5.5 vcc ( v ) operating current (ua) 0 20 40 60 80 100 120 140 160 180 200 2.533.544.555.5 vcc (v) quiescent current (ua) v cc vs. stand-by current v cc vs. frequency 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 2.5 3 3.5 4 4.5 5 5.5 vcc (v) stand-by current (ua) 500 520 540 560 580 600 620 640 660 680 700 2.533.544.555.5 vcc (v) frequency (khz) v cc vs. current limit v cc vs. r ds(on) 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 33.544.555.5 vcc ( v ) current limit (a) current limit vout=2v 0 100 200 300 400 500 600 2.5 3 3.5 4 4.5 5 5.5 r ds(on) (m ? ) vcc (v)
ap1604a pwm/pfm dual mode step-down dc/dc converter ap1604a rev. 2 5 of 7 february 2009 www.diodes.com ? diodes incorporated typical performance characteristics (continued) line regulation load regulation -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 2.533.544.555.5 vcc (v) v / v out (%) -3 -2 -1 0 1 2 3 0 100 200 300 400 500 600 700 800 load (ma) v / v out (%) typical application circuit 0.1uf v in fb v cc gnd 10uh ap1604a v out ce/ss 68uf 2.2v ~ 5.5v b240a r2 r1 0.1uf 68uf v out 10nf 100nf ~ 1m ? vout = 1 u (1 + r1 r2 ) r1 = 100k ~ 200k
ap1604a pwm/pfm dual mode step-down dc/dc converter ap1604a rev. 2 6 of 7 february 2009 www.diodes.com ? diodes incorporated marking information (1) sot25 1 2 3 5 7 4 xx y w x xx : identification code w : week : a~z : 1~26 week; x : a~z : lead free ( top view ) y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week a~z : green part number package identification code ap1604aw sot25 er package information (all dimensions in mm) (1) package type: sot25
ap1604a pwm/pfm dual mode step-down dc/dc converter ap1604a rev. 2 7 of 7 february 2009 www.diodes.com ? diodes incorporated important notice life support diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to any product herein. diodes incorporated does not assume any liability arising out of the application or use of any pr oduct described herein; neither does it convey any license under its patent rights, nor the rights of others. the user of products in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on our website, harmless against all dam ages. diodes incorporated products are not authorized for use as critical components in life support devices or systems without the e xpressed written approval of the president of diodes incorporated.
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