general description the RT9177 is a 200ma low dropout and low noise micro-power regulator suitable for portable rf applications. the output voltage accuracy within 2% and range from 2.4v to 3.2v in 100mv increments could be selected. it is designed for using very low esr output capacitor. its output remains stable even in using 1 f ceramic as its output capacitor. using an internal pmos as the pass device cause that don?t need extra gnd current in heavy load and dropout conditions. in shutdown mode, nearly zero operation current cause the ic is suitable for battery-power devices. other features including current limiting, over temperature protection and adding a capacitor in bypass pin to improve its noise performance are functional. ordering information RT9177- ? ? ? ? ? features z ultra-low-noise(150nv/ hz ) for rf application z 1 f ceramic c out stable z low dropout voltage(220mv @ 200ma) z low operation current - 80 a typical z shutdown function z low temperature coefficient z current and thermal limiting z custom voltage available z sot-25 package applications z cellular telephones z laptop, notebook, and palmtop computers z battery-powered equipment z hand-held equipment pin configurations part number pin configurations RT9177- ? ? cb (plastic sot-25) 1. in 2. gnd 3. shdn 4. bp 5. out RT9177- ? ? cbr (plastic sot-25) 1. out 2. gnd 3. in 4. shdn 5. bp typical application circuit 5 4 3 2 1 top view 5 4 3 2 1 top view c: commercial standard b operating temperature range package type : sot-25 type i br : sot-25 type ii output voltage 24 : 2.4v 25 : 2.5v : : 31 : 3.1v 32 : 3.2v RT9177 on off gnd in out v ou t c bp 10nf c out 1f v in c in 1f shdn RT9177 product specification 1 of 3 4008-318-123 sales@twtysemi.com http://www.twtysemi.com
marking infromation part number marking RT9177-24cb h9 RT9177-25cb ha RT9177-26cb hb RT9177-27cb hc RT9177-28cb hd RT9177-29cb he RT9177-30cb hf RT9177-31cb hg RT9177-32cb hh part number marking RT9177-24cbr p9 RT9177-25cbr pa RT9177-26cbr pb RT9177-27cbr pc RT9177-28cbr pd RT9177-29cbr pe RT9177-30cbr pf RT9177-31cbr pg RT9177-32cbr ph pin description pin name pin function in ic power pin gnd ic gnd shdn active low shutdown input bp reference noise bypass out regulator output function block diagram + _ mos driver current-limit and thermal protection shutdown and logic control vref error amp gnd out in shdn bp RT9177 product specification 2 of 3 4008-318-123 sales@twtysemi.com http://www.twtysemi.com
absolute maximum ratings z input voltage v in 7v z power dissipation sot-25 0.25w z operating junction temperature range ? 40 c to 125 c z storage temperature range ? 65 c to 150 c z thermal resistance r ja 250 c/w z lead temperature (soldering 5 sec.) 260 c electrical characteristics (v in = 5.0v, c in = 1 f, c out = 1 f, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max units input voltage v in 2.5 -- 6 v output voltage accuracy ? v out i l = 1ma -2 -- +2 % maximum output current i max 200 -- -- ma current limit i limit r load = 1 ohm -- 300 -- ma no load -- 80 150 gnd pin current i g i out = 200ma -- 90 150 a i out = 1ma -- 1.1 5 i out = 50ma -- 55 100 dropout voltage (note) (v out (nominal) 3.0v version) v drop i out = 200ma -- 220 300 mv line regulation ? v line v in = (v out +0.15) to 6v, i out = 1ma -0.2 -- +0.2 %/v load regulation ? v load i out = 0ma to 200ma -- 0.01 0.04 %/ma shdn input high threshold v ih v in = 3v to 5.5v 1.0 -- -- v shdn input low threshold v il v in = 3v to 5.5v -- -- 0.4 v shdn bias current i sd -- -- 100 na shutdown supply current i gsd v out = 0v -- 0.01 1 a thermal shutdown temperature t sd -- 150 -- c output noise e no c bp = 10nf, c out = 10 f -- 150 -- nv/ hz ripple rejection psrr f = 100hz, c bp = 10nf, c out = 10 f -- 68 -- db notes: dropout voltage definition: v in - v out when v out is 50 mv below the value of v out at v in = v out + 0.5v RT9177 product specification 3 of 3 4008-318-123 sales@twtysemi.com http://www.twtysemi.com
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