RT9161/a 1 ds9161/a-30 august 2006 www.richtek.com pin configurations 300/500ma low dropout linear voltage regulator ordering information (top view) general description the RT9161/a is a 300/500ma fixed output voltage low dropout linear regulator. typical ground current is approximately 110 a, from zero to maximum loading conditions. wide range of available output voltage fits most of applications. built-in output current-limiting most thermal-limiting provide maximal protection against any fault conditions. for ease of application, the RT9161/a comes in the popular 3-pin sot-23 (300ma), sot-89 (300ma), sot-223 (500ma), or to-92 packages. applications z voltage regulator for lan card, cd-rom, and dvd z wireless communication systems z battery powered systems marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area, otherwise visit our website for detail. features z z z z z low dropout voltage of 200mv at output current 100ma, 450mv at output current 300ma, and 750mv at 500ma output current z z z z z guaranteed 300/500ma output current z z z z z internal 1.5 p-mosfet draws no base current z z z z z low ground current 110 a z z z z z 2% accuracy output voltage z z z z z input voltage range up to 12v z z z z z extremely tight load regulation z z z z z fast transient response z z z z z current-limiting and thermal-limiting z z z z z rohs compliant and 100% lead (pb)-free note : richtek pb-free and green products are : ` rohs compliant and compatible with the current require- ments of ipc/jedec j-std-020. ` suitable for use in snpb or pb-free soldering processes. ` 100%matte tin (sn) plating. gnd vin (tab) vout 123 sot-89 sot-23-3 1 2 3 gnd vout vin sot-223 gnd vin (tab) vout 1 2 3 output voltage 15 : 1.5v 16 : 1.6v : 49 : 4.9v 50 : 5.0v RT9161/a- package type v : sot-23-3 x : sot-89 g : sot-223 zl : to-92 (l-type) zt : to-92 (t-type) operating temperature range p : pb free with commercial standard g : green (halogen free with commer- cial standard) 500ma output current 300ma output current
RT9161/a 2 ds9161/a-30 august 2006 www.richtek.com function block diagram typical application circuit pin name pin function vout output voltage gnd ground vin power input functional pin description current limiting sensor thermal shutdown + - error amp 1.2v reference vin gnd vout vin gnd vout RT9161/a + + c out electrolytic 10uf c in 1uf v in v out 2 3 1vin gnd vout to-92 RT9161/a- ? ? czl 2 3 1 gnd vin vout to-92 RT9161/a- ? ? czt
RT9161/a 3 ds9161/a-30 august 2006 www.richtek.com absolute maximum ratings z input v oltage ----------------------------------------------------------------------------------------------------------- ? 0.3 to 14v z operating junction temperature range ----- -------------------------------------------------------------------- ? 40 c to 125 c z storage temperature range --------------------------------------------------------------------------------------- ? 65 c to 150 c z power dissipation, p d @ t a = 25 c sot-23-3 --------------------------------------------------------------------------------------------------------------- 0.4w sot-89 ------------------------------------------------------------------------------------------------------------------ 0.571w sot-223 ---------------------------------------------------------------------------------------------------------------- 0.741w to-92 -------------------------------------------------------------------------------------------------------------------- 0.625w z package thermal resistance (note 4) sot-23-3, ja ---------------------------------------------------------------------------------------------------------- 250 c/w sot-23-3, jc --------------------------------------------------------------------------------------------------------- 140 c/w sot-89, ja ------------------------------------------------------------------------------------------------------------ 175 c/w sot-89, jc ------------------------------------------------------------------------------------------------------------ 100 c/w sot-223, ja ----------------------------------------------------------------------------------------------------------- 135 c/w sot-223, jc ---------------------------------------------------------------------------------------------------------- 15 c/w to-92, ja -------------------------------------------------------------------------------------------------------------- 160 c/w to-92, jc -------------------------------------------------------------------------------------------------------------- 125 c/w electrical characteristics (t a = 25 c, c in = 1 f, c out = 10 f, unless otherwise specified.) parameter symbol test conditions min typ max units output voltage accuracy v out i l = 1ma, v in = 5v -2 -- +2 % output voltage temperature coefficient -- 50 150 ppm/ c line regulation v line i l = 1ma, v in = 4.5 ~ 12v -- 2 3 %v out load regulation (note1) v load i l = 1ma ~ 300/500ma, v in = 5v -- 1 30/50 mv RT9161 350 580 -- current limit (note 2) RT9161a i lim v in = 5v, v out = 0v 500 900 -- ma dropout voltage (note 3) v drop i l = 300/500ma -- 450/750 600/1000 mv standby current i standby i l = 0, v in = 12v -- 110 180 a note 1. regulation is measured at constant junction temperature, using pulsed on time. note 2. current limit is measured at constant junction temperature, using pulsed on time. note 3. the dropout voltage is defined as v in -v out , which is measured when v out is v out(normal) ? 100mv. note 4. ja is measured in the natural convection at t a = 25 c on a low effe ctive single layer thermal conductivity test board of jedec 51-3 thermal measurement standard.
RT9161/a 4 ds9161/a-30 august 2006 www.richtek.com quiescient current vs. temperature 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 -30 0 30 60 90 120 temperature quiescient current (ma) typical operating characteristics temperature stability 2.4 2.6 2.8 3 3.2 3.4 -50 -25 0 25 50 75 100 125 temperature output voltage (v) v out = 3.3v v out = 2.5v ( c) v in = 5v ( c) dropout voltage (v in -v out ) 0 0.2 0.4 0.6 0.8 1 0 100 200 300 400 500 i load (ma) dropout voltage (v) v out = 3.3v 125 c 25 c short circuit current 0 0.2 0.4 0.6 0.8 1 1.2 1.4 0246810 input/output differential (v) short circuit current (a) 125 c 25 c t t t 1 > 2 > 100 0 -100 -200 7 6 5 4 line transient response time ( 100 f electrolytic i out = 0.1a v out = 3.3v t a = 25 c time (100 s/div) t t t 1 > 2 > 100 0 -100 -200 7 6 5 4 line transient response time ( 100 f electrolytic i out = 0.1a v out = 2.5v t a = 25 c time (100 s/div)
RT9161/a 5 ds9161/a-30 august 2006 www.richtek.com psrr -60 -50 -40 -30 -20 -10 0 10 100 1000 10000 100000 1000000 frequency (hz) psrr (db) c in = 1uf c out = 10 uf tantalum v in = 5v v out = 2.5v t a = 25 c 10ma 100ma 1m 100k 10k 1k t t t 1 > 2 > time (100 s/div) load transient response c in = 1 f c out = 10 f load current ( ma ) 100 50 1 -50 60 40 20 0 -20 output voltage deviation (mv) v in = 5v v out = 3.3v t a = 25 c time (100 s/div) t t t 1 > 2 > time (100 s/div) load transient response c in = 1 f c out = 10 f load current (ma) 200 100 10 -100 150 100 50 0 -50 output voltage deviation (mv) v in = 5v v out = 3.3v t a = 25 c time (100 s/div) t t t 1 > 2 > time (100 s/div) load transient response c in = 1 f c out = 10 f load current ( ma ) 200 100 10 -100 150 100 50 0 -50 output voltage deviation (mv) v in = 5v v out = 2.5v t a = 25 c time (100 s/div) t t t 1 > 2 > time (100 s/div) load transient response c in = 1 f c out = 10 f load current ( ma ) 100 50 1 -50 60 40 20 0 -20 output voltage deviation (mv) v in = 5v v out = 2.5v t a = 25 c time (100 s/div) psrr -60 -50 -40 -30 -20 -10 0 10 100 1000 10000 100000 1000000 frequency (hz) psrr (db) c in = 1uf c out = 10 uf tantalum v in = 5v v out = 3.3v t a = 25 c 10ma 100ma 1m 100k 10k 1k
RT9161/a 6 ds9161/a-30 august 2006 www.richtek.com application information a 10uf capacitor with 200m or higher esr, connecting between vout and gnd pins, is recommended for stability. a capacitor with esr smaller than 200 m may cause vout oscillation as shown in figure 1. operating temperature should be well considered to ensure that the capacitance is no less than 10uf over the operating temperature range. please take the notice that aluminum electrolytic capacitors may cause vout oscillation when operating below -25 c. the capacitance can be increased without limit for better transient response. a 1uf or higher capacitor should be placed between vin and gnd to filter out input noise and ensure stable output voltage. figure 1 thermal protection limits power dissipation in RT9161/a. when the operation junction temperature exceeds 165 c, the otp circuit starts the thermal shutdown function and turns the pass element off. the pass element turn on again after the junction temperature cools by 30 c. for continuous operation, do not exceed absolute maximum operation junction temperature 125 c. the power dissipation definition in device is: p d = (v in -v out ) x i out + v in x i q the maximum power dissipation depends on the thermal resistance of ic package, pcb layout, the rate of surroundings airflow and temperature difference between junction to ambient. the maximum power dissipation can be calculated by following formula: p d(max) = ( t j(max) - t a ) / ja where t j(max) is the maximum operation junction temperature 125 c, t a is the ambient temperature and the ja is the junction to ambient thermal resistance. for recommended operating conditions specification of RT9161/a, where t j(max) is the maximum junction temperature of the die (125 c) and t a is the maximum ambient temperature. the junction to ambient thermal resistance ja is layout dependent. for sot-223 packages, the thermal resistance ja is 135 c/w on the standard jedec 51-3 single-layer 1s thermal test board. the maximum power dissipation at t a = 25 c can be calculated by following formula: p d(max) = ( 125 c - 25 c ) / 250 = 0.400 w for sot-23-3 packages p d(max) = ( 125 c - 25 c ) / 175 = 0.571 w for sot-89 packages p d(max) = ( 125 c - 25 c ) / 135 = 0.741 w for sot-223 packages p d(max) = ( 125 c - 25 c ) / 160 = 0.625 w for to-92 packages the maximum power dissipation depends on operating ambient temperature for fixed t j(max) and thermal resistance ja . for RT9161/a packages, the figure 2 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. region of stable c out esr vs. load current 0.01 0.1 1 10 100 0 100 200 300 400 500 load current (ma) c out esr ( ? ) v in = 3.3v c in = 1uf c out = 10uf instable stable figure 2. derating curves 0 100 200 300 400 500 600 700 800 0 15 30 45 60 75 90 105 120 ambient temperature maximum power dissipation (mw) ( c) sot-223 package to-29 package sot-89 package sot-23-3 package
RT9161/a 7 ds9161/a-30 august 2006 www.richtek.com outline dimension 3-lead to-92 plastic package a1 l b e d1 e d c a dimensions in millimeters dimensions in inches symbol min max min max a 3.175 4.191 0.125 0.165 a1 1.143 1.372 0.045 0.054 b 0.406 0.533 0.016 0.021 c 0.406 0.533 0.016 0.021 d 4.445 5.207 0.175 0.205 d1 3.429 5.029 0.135 0.198 e 4.318 5.334 0.170 0.210 e 1.143 1.397 0.045 0.055 l 12.700 0.500
RT9161/a 8 ds9161/a-30 august 2006 www.richtek.com a b a1 b d c e h l sot-23-3 surface mount package dimensions in millimeters dimensions in inches symbol min max min max a 0.889 1.295 0.035 0.051 a1 0.000 0.152 0.000 0.006 b 1.397 1.803 0.055 0.071 b 0.356 0.508 0.014 0.020 c 2.591 2.997 0.102 0.118 d 2.692 3.099 0.106 0.122 e 1.803 2.007 0.071 0.079 h 0.080 0.254 0.003 0.010 l 0.300 0.610 0.012 0.024
RT9161/a 9 ds9161/a-30 august 2006 www.richtek.com c1 b b b1 b a c e e d d1 h a 3-lead sot-89 surface mount package dimensions in millimeters dimensions in inches symbol min max min max a 1.397 1.600 0.055 0.063 b 0.356 0.483 0.014 0.019 b 2.388 2.591 0.094 0.102 b1 0.406 0.533 0.016 0.021 c 3.937 4.242 0.155 0.167 c1 0.787 1.194 0.031 0.047 d 4.394 4.597 0.173 0.181 d1 1.397 1.753 0.055 0.069 e 1.448 1.549 0.057 0.061 h 0.356 0.432 0.014 0.017
RT9161/a richtek technology corp. headquarter 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 fax: (8863)5526611 richtek technology corp. taipei office (marketing) 8f-1, no. 137, lane 235, paochiao road, hsintien city taipei county, taiwan, r.o.c. tel: (8862)89191466 fax: (8862)89191465 email: marketing@richtek.com 10 ds9161/a-30 august 2006 www.richtek.com dimensions in millimeters dimensions in inches symbol min max min max a 1.450 1.803 0.057 0.071 a1 0.020 0.100 0.0008 0.0047 b 0.610 0.787 0.024 0.031 b 3.302 3.708 0.130 0.146 c 6.706 7.290 0.264 0.287 d 6.299 6.706 0.248 0.264 d1 2.896 3.150 0.114 0.124 e 2.261 2.362 0.089 0.093 h 0.229 0.330 0.009 0.013 l 1.550 1.950 0.061 0.077 l1 0.800 1.100 0.009 0.013 3-lead sot-223 surface mount package a a1 b h b d d1 c l e e l1
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