product structure silicon monolithic integrated circuit this product has no designed protection against radioactive rays 1/ 17 tsz02201 - 0g3g0c200060 - 1 - 2 10.dec.2015 rev.002 www.rohm.com ? 2012 rohm co., ltd. all rights reserved. tsz22111 ? ? constant current led driver with 64 dimming steps for up to 4 leds b d1754hfn general description BD1754HFN is a multi - level brightness control led driver that works as a constant current driver with 64 steps, so that the driving current can be adjusted finely. BD1754HFN is best suited to turn on leds that require high - accuracy led brightness control. features ? current r egulation for up to 4 p arallel leds ? adjustable c onstant c urrent with 64 s teps ? high a ccuracy and g ood m atching of each c urrent c hannel (0 .5% typ) ? brightness c ontrol v ia s ingle - l ine d igital c ontrol i nterface (uni - port interface control = upic) applications this driver can be used in various application s such as mobile phones, portable game consoles and etc. typical application circuit key specification ? operating power supply voltage range : 2.7v to 5.5v ? quiescent current: 0.1a (typ) ? operating temperature range: - 30c to +85 c package w(typ) x d(typ) x h(max) BD1754HFN in iset gnd en l4 l3 l2 l1 power supply 0.1 f 120k (when i led - max =32ma) c in r iset hson8 2.90mm x 3.00mm x 0.60mm datashee t datashee t
2 / 17 BD1754HFN data s heet tsz 0 2201 - 0g3g0c200060 - 1 - 2 10.dec.2015 rev.002 www.rohm.com ? 2012 rohm co., ltd. all rights reserved. tsz22111 >? 15 >? 001 absolute maximum ratings (ta = 25c ) parameter symbol rating unit maximum applied voltage v max 7 v power dissipation pd 0.63 (note 1) w operating temperature range topr - 30 to +85 c storage temperature range tstg - 55 to +150 c (note 1) when mounted on a glass epoxy board (70 mm x 70 mm x 1.6 mm). derate by 5.04 mw/c for ta higher than 25 c. caution: operating the ic over the absolute maximum ratings may damage the ic. the damage can either be a short circuit between pins o r an open circuit between pins. therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the ic is operated over the absolute maximum ratings. recommended operating conditions (ta = - 30 c to +85 c ) parameter symbol rating unit conditions min typ max operating power supply voltage v in 2.7 3.6 5.5 v driver pin voltage range v dr v 0.2 - v in - 1.4 v when current driver power on. electrical characteristics (unless otherwise specified, ta = 25 c and v in = 3.6v) parameter symbol limit unit conditions min typ max quiescent current i q - 0.1 1 $ v en =0v circuit current i dd - 1.2 2.0 ma except led current [current driver] maximum current i led - max 29.76 32.0 34.24 ma r iset n
led current accuracy iled - diff - - 7.0 % when current 16.5 ma setting r iset n
led current matching iled - mat ch - 0.5 3.0 (note 1) % when current 16.5 ma setting r iset n
[logic controller] low threshold voltage v il - - 0.4 v high threshold voltage v ih 1.4 - - v + ? / h y h o , q s x w & |