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rt9164 ds9164-10 april 2002 www.richtek-ic.com.tw 1 1a fixed and adjustable low dropout positive voltage regulators general description the rt9164 series of high performance positive voltage regulators is designed for applications requiring low dropout performance at fully rated current. additionally, the rt9164 series provides excellent regulation over variations in line and load. outstanding features include low dropout performance at rated current, fast transient response, internal current-limiting, and thermal- shutdown protection of the output device. the rt9164 series of three terminal regulators offers fixed and adjustable voltage options available in space-saving sot-223, and to-252 packages. ordering information rt9164- ?? ? ? features z low dropout performance, 1.4v max. z full current rating over line and temperature z fast transient response z 1% output voltage accuracy z 2.5v, 2.85v, 3.3v, and 3.5v fixed/adjustable output voltage z sot-223 and to-252 packages applications z active scsi termination z low voltage microcontrollers z switching power supply post-regulator pin configurations part number pin configurations rt9164- ?? cg (plastic sot-223) top view 1. adj/gnd 2. vout (tab) 3. vin rt9164- ?? cl (plastic to-252) top view 1. adj/gnd 2. vout (tab) 3. vin rt9164- ?? clr (plastic to-252) top view 1. vin 2. gnd (tab) 3. vout operating temperature range c: commercial standard package type g : sot-223 l : to-252 (dpak) lr : to-252 output voltage default : adjustable 25 : 2.5v 28 : 2.85v 33 : 3.3v 35 : 3.5v 123 123 123
rt9164 www.richtek-ic.com.tw ds9164-10 april 2002 2 absolute maximum ratings z input voltage 12v z package thermal resistance sot-223, jc 15 c/w sot-223, ja (1) 60 c/w to-252, jc 15 c/w to-252, ja (1) 56 c/w z operating junction temperature range 0 c to 125 c z storage temperature range ? 65 c to 150 c z lead temperature (soldering, 10 sec.) 260 c note: (1) minimum pad size of 0.038 in 2 electrical characteristics (t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max units i out = 10ma, (v in -v out ) = 2v, t a = 25 c 1.244 1.256 1.268 v reference voltage (1) rt9164 v ref 10ma < i out < 1a, 1.4v < v in -v out < 10v 1.231 1.256 1.276 v i out = 10ma, v in = 4.0v, t j = 25 c 2.475 2.500 2.525 v rt9164-25 0 < i out < 1a, 4.0v < v in < 10v 2.450 2.500 2.550 v i out = 10ma, v in = 4.25v, t j = 25 c 2.820 2.850 2.880 v rt9164-28 0 < i out < 1a, 4.25v < v in < 10v 2.790 2.850 2.910 v i out = 10ma, v in = 4.75v, t j = 25 c 3.267 3.300 3.333 v rt9164-33 0 < i out < 1a, 4.75v < v in < 10v 3.235 3.300 3.365 v i out = 10ma, v in = 5v, t j = 25 c 3.465 3.500 3.535 v output voltage (1) rt9164-35 v out 0 < i out < 1a, 5.0v < v in < 10v 3.430 3.500 3.570 v rt9164 i out = 10ma, 1.5v v in -v out 10v -- 0.1 0.3 % rt9164-25 i out = 0ma, 4.0v v in 12v -- 1 6 mv rt9164-28 i out = 0ma, 4.25v v in 12v -- 1 6 mv rt9164-33 i out = 0ma, 4.75v v in 12v -- 1 6 mv line regulation (1) rt9164-35 ? v line i out = 0ma, 5.0v v in 12v -- 1 6 mv rt9164 (v in -v out ) = 3v, 0ma i out 1a -- 0.2 0.4 % rt9164-25 v in = 4.0v, 0 i out 1a -- 1 10 mv rt9164-28 v in = 4.25v, 0 i out 1a -- 1 10 mv rt9164-33 v in = 4.75v, 0 i out 1a -- 1 10 mv load regulation (1) rt9164-35 ? v load v in = 5.0v, 0 i out 1a -- 1 15 mv to be continued
rt9164 d ds9164-10 april 2002 www.richtek-ic.com.tw 3 parameter symbol test conditions min typ max units i out = 100ma -- 1.1 1.2 v i out = 500ma -- 1.15 1.25 v i out = 800ma -- 1.2 1.3 v dropout voltage (2) v drop i out = 1000ma -- 1.3 1.4 v current limit i limit v in = 5v 1000 -- 2000 ma minimum load current rt9164 (v in -v out ) = 2v -- 5 10 ma quiescent current rt9164-xx i q v in = 5v -- 5 10 ma ripple rejection psrr f ripple = 120hz , (v in - v out ) = 2v, v ripple = 1v p-p -- 72 -- db adjust pin current i adj -- 65 120 a adjust pin current change ? i adj 10ma i out 1a, v in = 5v -- 0.2 5 a notes: (1) low duty cycle pulse testing with kelvin connections. (2) v out and v ref = 1%. function block diagram pin description pin name pin function adj/gnd adjust output or ground vout output voltage vin power input s.o.a. current li miting amplifier thermal overload voltage regulation amplifier v ref li mit sense vin vout adj/gnd
rt9164 www.richtek-ic.com.tw ds9164-10 april 2002 4 typical application circuit fig. 1 adjustable voltage regulator fig. 2 active scsi bus terminator fig. 3 fixed voltage regulator rt9164 adj vout v ref r1 133 1% r2 232 1% v ou t = 3.45v i adj v in = 5v + c2 10 f tantalum + c1 10 f (1) c1 needed if device is far from filter capacitors. (2) c2 required for stability. vin v ou t = v ref (1+ ) + i adj r 2 1 2 r r rt9164-28 + 22 f + 10 f vout vin 18 -27 lines gnd rt9164-33 + c2 10 f tantalum + c1 10 f i q vout vin v in = 5v v ou t 3. 3v (1) c1 needed if device is far from filter capacitors. (2) c2 required for stability. gnd
rt9164 d ds9164-10 april 2002 www.richtek-ic.com.tw 5 typical operating characteristics load regulation -0.35 -0.3 -0.25 -0.2 -0.15 -0.1 -0.05 0 -50 -25 0 25 50 75 100 125 temperature ( c) output voltage deviation (%) ? load = 1a adjust pin current 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 temperature ( c) adjust pin current ( a) dropout voltage (v in -v out ) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 0 200 400 600 800 output current (ma) dropout voltage (v) t j = 25 c t j = 125 c short-circuit current 0.0 0.5 1.0 1.5 2.0 2.5 02.557.510 input/output differential (v) short circuit current (a) t j = 125 c t j = 25 c rt9164-adj ripple rejection -100 -80 -60 -40 -20 0 frequency (hz) ripple rejection(db) c out = 20 f tantalum c adj = 22 f electrolytic i out = 0.5a 10 100 1k 10k 100k ripple rejection & current -100 -90 -80 -70 -60 -50 -40 -30 -20 i load (ma) ripple rejection(db) f ripple = 20khz f ripple = 120hz c out = 20 f tantalum c adj = 22 f electrolytic 0 200 400 600 800
rt9164 www.richtek-ic.com.tw ds9164-10 april 2002 6 temperature stability (v ref ) 1.23 1.24 1.25 1.26 1.27 1.28 -50 -25 0 25 50 75 100 125 temperature ( c) output voltage (v) temperature stability 2.2 2.4 2.6 2.8 3 3.2 3.4 -50 -25 0 25 50 75 100 12 5 temperature ( c) output voltage (v) 3.3v 2.85v 2.5v t t t 1 > 1 > 1 > 1 > 2 > 2 > 2 > 2 > 0 10 20 30 40 50 60 70 80 90 100 time ( s) rt9164-2.5 load transient response c in = 10 f tantalum c out = 10 f tantalum v in = 4v preload = 0.1a load current (a) output voltage deviation (v) 0.3 0.2 0.1 0 -0.1 -0.2 0.5 0 -0.5 load transient res p onse v out = 2.5v t t t 1 > 1 > 1 > 1 > 2 > 2 > 2 > 2 > 0 10 20 30 40 50 60 70 80 90 100 time ( s) rt9164-2.5 load transient response c in = 10 f tantalum c out = 10 f tantalum v in = 4v preload = 0.1a load current (a) output voltage deviation (v) 0.3 0.2 0.1 0 -0.1 -0.2 1.0 0 -1.0 load transient res p onse v out = 2.5v t t t 1 > 1 > 1 > 1 > 2 > 2 > 2 > 2 > 0 10 20 30 40 50 60 70 80 90 100 time ( s) rt9164-2.85 load transient response c in = 10 f tantalum c out = 10 f tantalum v in = 4.35v preload = 0.1a load current (a) output voltage deviation (v) 0.3 0.2 0.1 0 -0.1 -0.2 0.5 0 -0.5 load transient res p onse v out = 2.85v t t t 1 > 1 > 1 > 1 > 2 > 2 > 2 > 2 > 0 10 20 30 40 50 60 70 80 90 100 time ( s) rt9164-2.85 load transient response c in = 10 f tantalum c out = 10 f tantalum v in = 4.35v preload = 0.1a load current (a) output voltage deviation (v) 0.3 0.2 0.1 0 -0.1 -0.2 1.0 0 -1.0 load transient res p onse v out = 2.85v
rt9164 d ds9164-10 april 2002 www.richtek-ic.com.tw 7 t t t 1 > 1 > 1 > 1 > 2 > 2 > 2 > 2 > 0 10 20 30 40 50 60 70 80 90 100 time ( s) line transient response c out = 10 f tantalum i out = 0.1a output voltage deviation (mv) 20 0 -20 -40 4.5 3.5 2.5 1.5 v out + 0.5 input voltage (v) t t t 1 > 1 > 1 > 1 > 2 > 2 > 2 > 2 > 0 10 20 30 40 50 60 70 80 90 100 time ( s) rt9164-3.3 load transient response c in = 10 f tantalum c out = 10 f tantalum v in = 4.8v preload = 0.1a load current (a) output voltage deviation (v) 0.3 0.2 0.1 0 -0.1 -0.2 0.5 0 -0.5 load transient res p onse v out = 3.3v t t t 1 > 1 > 1 > 1 > 2 > 2 > 2 > 2 > 0 10 20 30 40 50 60 70 80 90 100 time ( s) rt9164-3.3 load transient response c in = 10 f tantalum c out = 10 f tantalum v in = 4.8v preload = 0.1a load current (a) 1.0 0 -1.0 0.3 0.2 0.1 0 -0.1 -0.2 output voltage deviation (v) load transient res p onse v out = 3.3v
rt9164 www.richtek-ic.com.tw ds9164-10 april 2002 8 application information output voltage adjustment like most regulators, the rt9164 regulates the output by comparing the output voltage to an internally generated reference voltage. on the adjustable version as shown in fig.4, the v ref is available externally as 1.25v between v out and adj. the voltage ratio formed by r1 and r2 should be set to conduct 10ma (minimum output load). the output voltage is given by the following equation: v out = v ref (1+ 1 2 r r ) + i adj r 2 on fixed versions of rt9164, the voltage divider is provided internally. fig. 4 basic adjustable regulator input bypass capacitor an input capacitor is recommended. a 10 f tantalum on the input is a suitable input bypassing for almost all applications. adjust terminal bypass capacitor the adjust terminal can be bypassed to ground with a bypass capacitor (c adj ) to improve ripple rejection. this bypass capacitor prevents ripple from being amplified as the output voltage is increased. at any ripple frequency, the impedance of the c adj should be less than r1 to prevent the ripple from being amplified: (2 * f ripple * c adj ) < r1 the r1 is the resistor between the output and the adjust pin. its value is normally in the range of 100- 200 ? . for example, with r1 = 124 ? and f ripple = 120hz, the c adj should be > 11 f. output capacitor rt9164 requires a capacitor from v out to gnd to provide compensation feedback to the internal gain stage. this is to ensure stability at the output terminal. typically, a 10 f tantalum or 50 f aluminum electrolytic is sufficient. note: it is important that the esr for this capacitor does not exceed 0.5 ? . the output capacitor does not have a theoretical upper limit and increasing its value will increase stability. c out = 100 f or more is typical for high current regulator design. load regulation when the adjustable regulator is used (fig.5), the best load regulation is accomplished when the top of the resistor divider (r1) is connected directly to the output pin of the rt9164. when so connected, r p is not multiplied by the divider ratio. for fixed output version, the top of r1 is internally connected to the output and ground pins can be connected to low side of the load. fig. 5 best load regulation using adjustable output regulator thermal protection rt9164 has thermal protection which limits junction temperature to 150 c. however, device functionality rt9164 adj vout v ref r1 r2 v ou t i adj 65 a v in vin 10 f + c adj + 10 f + rt9164 vout vin v in gnd r l connect r2 to load r p parasitic line resistance r 2 r1 (connect r1 to vout or case)
rt9164 d ds9164-10 april 2002 www.richtek-ic.com.tw 9 is only guaranteed to a maximum junction temperature of +125 c. the power dissipation and junction temperature for rt9164 in dpak package are given by p d = (v in - v out ) i out t junction = t ambient + (p d ja ) note: t junction must not exceed 125 c current limit protection rt9164 is protected against overload conditions. current protection is triggered at typically 1.6a. thermal consideration the rt9164 series contain thermal limiting circuitry designed to protect itself from over-temperature conditions. even for normal load conditions, maximum junction temperature ratings must not be exceeded. as mention in thermal protection section, we need to consider all sources of thermal resistance between junction and ambient. it includes junction-to- case, case-to-heat-sink interface, and heat sink thermal resistance itself. junction-to-case thermal resistance is specified from the ic junction to the bottom of the case directly below the die. proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. the case of all devices in this series is electrically connected to the output. therefore, if the case of the device must be electrically isolated, a thermally conductive spacer is recommended.
rt9164 www.richtek-ic.com.tw ds9164-10 april 2002 10 package information dimensions in millimeters dimensions in inches symbol min max min max a -- 1.803 -- 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 0.914 -- 0.036 -- 3-lead sot-223 plastic surface mount h l e e d d1 c b b a a1
rt9164 d ds9164-10 april 2002 www.richtek-ic.com.tw 11 dimensions in millimeters dimensions in inches symbol min max min max a 2.184 2.388 0.086 0.094 b 0.889 2.032 0.035 0.080 b 0.508 0.889 0.020 0.035 b1 1.016 ref. 0.040 ref. b2 0.457 0.584 0.018 0.023 c 0.457 0.584 0.018 0.023 d 6.350 6.731 0.250 0.265 d1 5.207 5.461 0.205 0.215 e 5.334 6.223 0.210 0.245 e 2.108 2.438 0.083 0.096 l1 9.398 10.414 0.370 0.410 l2 0.508 -- 0.020 -- l3 0.635 1.016 0.025 0.040 u 3.810 ref. 0.150 ref. v 3.048 ref. 0.120 ref. 3-lead to-252 plastic surface mount package u v l1 c a b2 l2 d d1 b e b b1 e l3
rt9164 www.richtek-ic.com.tw ds9164-10 april 2002 12 richtek technology corp. headquarter 6f, no. 35, hsintai road, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5510047 fax: (8863)5537749 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-ic.com.tw

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