rp105x series 400ma 0.9v input ldo with dual input pin no.ek-179-100119 cmos ldo regulator the rp105x series are cmos-based ldo regulators featuring 400ma output with dual input pin. the input voltage can correspond from 0.9v by the inputting voltage into v bias . the uvlo function will lock out the internal circuit, if the input voltage is less than the uvlo voltage. due to a built-in nch. transistor with low on-resistance of 0.4 (at v out = 0.8v), rp105x provides a low dropout voltage. rp105x also has an excellent line transient response. in addition to sot-23-5 and sc-88a packages, a 1.2mm square dfn(plp)1212- 6 package is also available. features ? supply current (i ss ) typ. 28 a (v in =set v out +0.5v) ? standby current (i standby ) typ. 0.1 a (same as above, ce=?l?) ? dropout voltage (v dif ) typ. 0.18v (i out =400ma, v bias =3.6v) ? ripple rejection (rr) typ. 80db (f=1khz, v in ripple) ? input voltage range1 (v bias ) 2.4v to 5.25v ? ? input voltage range2 (v in ) 0.9v to v bias ? ? output voltage range (v out ) 0.6v to1.5v (internally fixed) ? output voltage accuracy 15mv ? temp.coeff.of output voltage typ. 50ppm/ c ? line regulationtyp. 0.02%/v ? fold-back protection circuit current limit typ.120ma ? auto-discharge function d version ? packages dfn(plp)1212-6, sc-88a, sot-23-5 ? ceramic capacitors can be used. c bias =c in =1 f or more, c out =2.2 f or more (the above shows specification at topt=25 c. design assurance value at -40 c < = < = c is also available.) ? ) for detail, please check our website. block diagrams rp105xxxxb rp105xxxxd (without auto-discharge function) (with auto-discharge function) v in v out v bias gnd ce vref current limit uvlo v in v out v bias gnd ce vref current limit uvlo selection guides typical application package quantity per reel part no. dfn(plp)1212-6 5,000 pcs rp105k . xx . 1 . ? -tr sc-88a 3,000 pcs rp105q . xx . 2 . ? -tr-f sot-23-5 3,000 pcs rp105n . xx . 1 . ? -tr-f . xx . : specify the output voltage within the range 0.6v ( . 06 . ) to 1.5v ( . 15 . ) in 0.1v steps. . ? : select from ( . b . ) without auto-discharge function or ( . d . )with auto-discharge function v in ce agnd pgnd v out l x l step-down dc/dc converter rp500x v bias ce v in gnd v out rp105x dc/dc_out vr_out c out 2.2 f c bias 1 f c out 10 f 4.7 h 10 f c in li-ion or 3cell 3.6v c in 1 f packages typica l characteristic dfn(plp)1212-6 sc-88a sot-23-5 top view bottom view 1 4 2 5 3 6 3 6 2 5 1 4 1 3 5 4 2 1 3 5 4 2 1 v bias 2 gnd 3 ce 4 v in 5 nc 6 v out 1 v bias 2 gnd 3 v out 4 v in 5 ce 1 v in 2 gnd 3 ce 4 v bias 5 v out rp105x15xx dropout voltage vs. output current 0 300 200 100 150 250 50 0 200 300 100 400 output current i out (ma) dropout voltage v dif (mv) 85 c 25 c -40 c applications ? power source for hand-held communication equipment, cameras, and vcrs ? power source for home appliances ? power source for battery-powered equipment
rp105x series cmos ldo regulator 400ma low voltage ldo regula tor with dual input pin the currently available informat ion as of january 2010 is provided in this new product news. ek-179-100119 what are rp series the new ricoh ic series perform better due to a newly appli ed manufactured process, compared to the current products. rp105x typical application step down dc/dc converters have been selected many times recently , because of regulator's big ener gy loss by becoming lower vol tage of mobile devices. but dc/dc converters require m any parts including inductors. the combining of dc/dc with regulators can reduce energy loss, space, and noize, in case of plural power supply lines. typical application step-down dc/dc converter rp500x series power supply unit device1 150ma ldo regulator rp103 device2 400ma ldo regulator rp105 device3 3.6v 3.6v 1.8v 1.2v 0.8v what is dfn(plp)1212-6 the dfn(plp)package is a leadless package using an electroforming sheet in place of lead frame. this extremely compact package features increased power dissipation and conversion to thinner type. the name is representing by a combination of the body size and the number of pins, i.e., dfn(plp)1212-6 stands for the body size of 1.2mm 1.2mm and 6pins. an environment-friendly, leadfree package with gold plat ed contacts complies with the rohs directive.
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