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RT9172 ? ds9172-18 august 2013 www.richtek.com 1 ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. features low dropout voltage low ground pin current load regulation of 0.4% at 3a 0.5ma quiescent current in shutdown mode guaranteed output current of 3a dc available in to-263 and to-220 packages output voltage accuracy 1.5% error flag indicates output status sense option improves better load regulation extremely low output capacitor requirements over temperature/over- current protection rohs compliant and 100% lead (pb)-free pin configurations applications microprocessor power supplies gtl, gtl+, btl, and sstl bus terminators power supplies for dsps scsi terminator post regulators high efficiency linear regulators battery chargers other battery powered applications 3a fixed output voltage ldo regulator ordering information general description the RT9172 series of low dropout linear regulators operate from a 2.25v to 6v input supply. a wide range of preset output voltage options is available. these low dropout linear regulators respond very fast to step changes in load, which are suitable for low voltage microprocessor applications. the RT9172 uses an internal p-mosfet as the pass device, which does not cause extra gnd current in heavy load and dropout condition. the shutdown mode of low operation current makes the ic suitable for power- saving systems. the other features include current limiting and over temperature protection. (top view) 23 1 vin gnd (tab) vout to-263 2 3 45 6 7 8 vout sense gnd nc vin gnd gnd en sop-8 to-220 23 1 vin gnd (tab) vout sot-223 23 1 vin gnd (tab) vout marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area. RT9172 package type t5 : to-220-5 m5 : to-263-5 t : to-220 m : to-263 g : sot-223 s : sop-8 lead plating system p : pb free g : green (halogen free and pb free) output voltage 1.5v to 3.3v (with 0.1v per step) - s : pin out exchange n : pin 5 bond sense f : pin 5 bond flg note : richtek 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.
RT9172 2 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical application circuit functional pin description pin no. RT9172f RT9172n RT9172s RT9172- xt RT9172- xm RT9172- xg pin name pin function 1 1 2 -- en chip enable. (active hight) 2 2 1 1 vin power input voltage. 3 3 3 2 gnd ground. 4 4 5 3 vout output voltage. 5 -- -- -- flg error flag. -- 5 4 -- sense remote sense. figure 1 vin en gnd (tab) sense vout 1 2 3 4 5 to-220-5 to-263-5 1 2 3 4 5 vin en gnd (tab) sense vout to-263-5 to-220-5 vin gnd vout RT9172-25 + + c out c in 10uf v in = 3.3v v out 2.5v, 3a RT9172f- xt5 RT9172f- xm5 RT9172n- xt5 RT9172n- xm5 RT9172s- xt5 RT9172s- xm5 en vin gnd (tab) vout sense/flg 1 2 3 4 5 1 2 3 4 5 en vin gnd (tab) vout sense/flg
RT9172 3 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. figure 2 figure 3 function block diagram RT9172f recommend c out : please note that the part must be paralleled with the least a 100 f electrolytic capacitor when using a 10 f (or greater) ceramic type as the output capacitor to prevent the output oscillating. vin gnd vout RT9172n-25 + + c out c in 10uf v in = 3.3v v load = 2.5v en sense l o a d i load trace resistance = r t 10k buffer amlifier thermal current limiting sensor + - v ref + - gnd flg vout en vin vin gnd vout RT9172f-25 + + c out c in 10uf v in = 3.3v v load = 2.5v -i load r t en l o a d i load trace resistance = r t 10k 10k v out = 2.5v flg
RT9172 4 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. RT9172n/RT9172s RT9172 buffer amlifier thermal current limiting sensor + - v ref gnd vout en vin sense buffer amlifier thermal current limiting sensor + - v ref gnd vout vin
RT9172 5 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. electrical characteristics (limits in standard typeface are for t a = 25c, unless otherwise specified: v in = v o(nom) + 1.0v, i l = 10ma, c out = 10uf(electrolytic), v en = v in ) parameter symbol test conditions min typ max unit output voltage tolerance ? 1.5 0 1.5 % input voltage range v in 2.25 -- 5.5 v line regulation v line v out + 0.4v < v in < 5.5v -- 0.35 1 % note 2 -- 0.4 1 note 3 -- 0.1 0.4 load regulation v load note 4 -- 0.1 0.4 % dropout voltage v drop i l = 3a -- 400 700 mv quiescent current i q -- 1.2 3 ma shutdown supply current i gsd v en = 0v -- 0.5 5 a peak output current i o( peak) 3.5 5 -- a short circuit protection current limit i limit 3.5 5 -- a over temperature protection shutdown threshold t sd guaranteed by design -- 170 -- c thermal shutdown hysteresis guaranteed by design -- 10 -- c absolute maximum ratings input v oltage ------------------------------------------------------------------------------------------------------------ 6v power dissipation, p d @ t a = 25 c sot-223 ----------------------------------------------------------------------------------------------------------------- 0.741w sop-8 -------------------------------------------------------------------------------------------------------------------- 0.625w to-263 ------------------------------------------------------------------------------------------------------------------- 2.222w to-220 ------------------------------------------------------------------------------------------------------------------- 1.820w package thermal resistance (note 1) sot-223, jc ----------------------------------------------------------------------------------------------------------- 23 c/w sot-223, ja ------------------------------------------------------------------------------------------------------------ 135 c/w sop-8, jc -------------------------------------------------------------------------------------------------------------- 45 c/w sop-8, ja -------------------------------------------------------------------------------------------------------------- 160 c/w to-263, jc ------------------------------------------------------------------------------------------------------------- 7.8 c/w to-263, ja ------------------------------------------------------------------------------------------------------------- 45 c/w to-220, jc ------------------------------------------------------------------------------------------------------------- 15 c/w to-220, ja ------------------------------------------------------------------------------------------------------------- 55 c/w esd rating ------------------------------------------------------------------------------------------------------------- 3 kv storage temperature range ---------------------------------------------------------------------------------------- ? 65 c to 150 c lead temperature (soldering, 10 se c.) --------------------------------------------------------------------------- 260 c junction temperature range ---------------------------------------------------------------------------------------- ? 40 c to 125 c
RT9172 6 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. parameter symbol test conditions min typ max unit shutdown function output = high 1.2 v in -- en pin shutdown threshold v en output = low -- 0 0.4 v en input current v en = v in -- 0.1 -- na flg pin leakage current i leakage -- 1 -- na flg pin sink current v flg = 0.5v 2 -- -- ma note 1. ja is measured in the natural convection at t a = 25 c on a low effective thermal conductivity test board of jedec 51-3 thermal measurement standard. the case point of jc is on the center of the exposed pad. the pad size is 125mm 2 on to-263 packages. note 2. RT9172-xx, RT9172f-xxxx5, 10ma < i l < 3a note 3. RT9172s-xxxx5, RT9172n-xxxx5, 10ma < i l < 3a note 4. RT9172xs, 10ma < i l < 1.5a
RT9172 7 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical operating characteristics temperature stability 2.40 2.44 2.48 2.52 2.56 2.60 -35 -15 5 25 45 65 85 105 125 temperature o u t pu t v o lt age (v) ( c) v out = 2.5v c in = 1uf (ceramic) c out = 10uf (tantalum) v in = v o + 1.0v i load = 10ma quiescent current vs. load current 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0.0 0.5 1.0 1.5 2.0 2.5 3.0 load current (a) quiescent current (ma) v out = 2.5v c in = 1uf (ceramic) c out = 10uf (tantalum) v in = v o + 1.0v quiescent current vs. temperature 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 -35 -15 5 25 45 65 85 105 125 temperature quiescent current (ma) ( c) v out = 2.5v c in = 1uf (ceramic) c out = 10uf (tantalum) v in = v o + 1.0v i load = 10ma quiescent current vs. supply voltage 0.0 0.3 0.6 0.9 1.2 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 supply voltage (v) quiescent current (ma) v out = 2.5v c in = 1uf (ceramic) c out = 10uf (tantalum) v in = 2v to 6v i load = 10ma dropout voltage (v in - v out ) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.00.51.01.52.02.53.0 load current (a) dropout voltage (v) v out = 2.5v c in = 1uf (ceramic) c out = 10uf (tantalum) t j = 25 c t j = 125 c current limit vs. temperature 2.0 2.8 3.6 4.4 5.2 6.0 -35 -15 5 25 45 65 85 105 125 temperature current limit (a) ( c) v out = 2.5v c in = 1uf (ceramic) c out = 10uf (tantalum) v in = v out + 1.0v
RT9172 8 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. psrr -55 -50 -45 -40 -35 -30 -25 -20 -15 frequency (hz) psrr (db) v out = 2.5v c out = 10uf (electrolytic) i load = 10ma i load = 100ma 10 100 1k 10k 100k 1m load regulation deviation -0.15 -0.12 -0.09 -0.06 -0.03 0.00 -35 -15 5 25 45 65 85 105 125 temperature output voltage deviation (%) a ( c) v out = 2.5v c in = 1uf (ceramic) c out = 10uf (tantalum) i load = 10ma range of stable esr values 0.01 0.1 1 10 100 00.511.522.53 output current (a) output capacitor esr( ). c in = 1uf (mlcc) c out = 10uf (mlcc) stable region reqion of instability line transient response input voltage deviation (v) output voltage deviation(mv) time (ms) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 3.5 4.5 5.5 0 20 40 c in = 1uf (ceramic) v out = 2.5v t a = 25 c c out = 10uf (tantalum) i load = 100ma line transient response input voltage deviation (v) output voltage deviation(mv) time (ms) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 3.5 4.5 5.5 0 20 40 c in = 1uf (ceramic) v out = 2.5v t a = 25 c c out = 10uf (electrolytic) i load = 100ma en pin shutdown response shutdown voltage (v) output voltage (v) time (ms) 0 1 2 3 4 5 6 7 8 9 10 0 1 2 0 1 2 v out = 1.8v c in = 1uf (ceramic) c out = 10uf (tantalum) i load = 100ma t a = 25 c
RT9172 9 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. load transient response load current deviation (a) output voltage deviation(mv) time (ms) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10 0 3 6 0 100 200 c in = 1uf (ceramic) v out = 2.5v t a = 25 c c out = 100uf (electrolytic) i load :100ma 3a load transient response load current deviation (a) output voltage deviation(mv) time (ms) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10 0 3 6 0 100 200 c in = 1uf (ceramic) v out = 2.5v t a = 25 c c out = 10uf (tantalum) i load : 100ma 3a noise signal output voltage (mv) time (ms) 0 1 2 3 4 5 6 7 8 9 10 0 -1.0 -0.5 0.5 1.0 1.5 c in = 1uf (ceramic) v out = 2.5v t a = 25 c c out = 10uf (tantalum) i load :10ma -1.5 noise signal output voltage (mv) time (ms) 0 1 2 3 4 5 6 7 8 9 10 0 -1.0 -0.5 0.5 1.0 1.5 -1.5 c in = 1uf (ceramic) v out = 2.5v t a = 25 c c out = 10uf (tantalum) i load :100ma
RT9172 10 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. application information capacitor selection an output capacitor as part of the device frequency compensation to maintain stability and improve transient response. proper capacitor selection is important to ensure proper operation. when the output capacitor is 10 f or greater, the output capacitor should have an esr less than 2 . this will improve transient response as well as promote stability. ultra-low-esr capacitor (<100m ), such as ceramic chip capacitors, may promote instability. these very low esr levels may cause an oscillation and/or underdamped transient response. a low-esr solid tantalum capacitor works extremely well and provides good transient response and stability over temperature. aluminum electrolytics can also be used, as long as the esr of the capacitor is <2 . the value of the output capacitor can be increased without limit. higher capacitor values help to improve transient response and ripple rejection and reduce output noise. the RT9172 requires a minimum input capacitance of 1 f between the input and ground pins to prevent any impedance interactions with the supply. the RT9172 requires a minimum of 10 f (tantalum, or electrolytic) capacitance between the output and ground pins for proper operation. please note that the part must be paralleled with the least a 100 f electrolytic capacitor when using a 10 f (or greater) ceramic type as the output capacitor to prevent the output oscillating. error operation (flg) the RT9172 produces a logic low signal at the flg pin when the output drops out of regulation due to low input voltage, current limiting, or thermal limiting. the internal error flg comparator has an open drain output stage. hence, the flg pin should be pulled high through a pull up resistor. sense pin in applications where the regulator output is not very close to the load, RT9172 can provide better remote load regulation using the sense pin. figure 2. and figure 3. depict the advantage of the sense option. RT9172 regulates the voltage at the output pin. hence, the voltage at the remote load will be the regulator output voltage minus the drop across the trace resistance. for example, in the case of a 3.3v output, if the trace resistance is 100m , the voltage at the remote load will be 3v with 3a of load current, i load . the RT9172 regulates the voltage at the sense pin. connecting the sense pin to the remote load will provide regulation at the remote load, as shown in figure 2. and figure 3. chip enable operation a cmos logic level signal at the chip enable (en) pin will turn-off the regulator. pin en must be actively terminated through a 10k pull-up resistor for a proper operation. if this pin is driven from a source that actively pulls high and low (such as a cmos rail to rail comparator), the pull-up resistor is not required. this pin must be tied to v in if not used. dropout voltage the dropout voltage of a regulator is defined as the minimum input-to-output differential required to stay within 2% of the output voltage. the RT9172 uses an internal mosfet with an r ds(on) 160m . for cmos ldos, the dropout voltage is the product of the load current and the r ds(on) of the internal mosfet. maximum output current capability RT9172 can deliver a continuous current of 1.5 a over the full operating temperature range. a heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. under all possible conditions, the junction temperature must be within the range specified under operating conditions. the total power dissipation of the device is given by : pd = (v in ? v out ) i out + (v in ) i gnd where i gnd is the operating ground current of the device (specified under electrical characteristics).
RT9172 11 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. dimensions in millimeters dimensions in inches symbol min max min max a 4.064 4.826 0.160 0.190 a1 2.032 2.921 0.080 0.115 b 0.635 1.016 0.025 0.040 b1 1.143 1.524 0.045 0.060 b2 0.305 0.559 0.012 0.022 c 1.143 1.397 0.045 0.055 d 9.779 10.668 0.385 0.420 e 7.620 9.398 0.300 0.370 e 2.286 2.794 0.090 0.110 e1 11.176 12.954 0.440 0.510 f 2.616 2.870 0.103 0.113 l1 17.526 18.542 0.690 0.730 l2 7.544 8.636 0.297 0.340 m 3.708 3.962 0.146 0.156 outline dimension 3-lead to- 220 plastic package c b2 e a1 a d b b1 l2 l1 e f e1 m
RT9172 12 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. dimensions in millimeters dimensions in inches symbol min max min max a 4.064 4.826 0.160 0.190 b 1.143 1.676 0.045 0.066 b 0.660 0.914 0.026 0.036 b1 1.143 1.397 0.045 0.055 b2 0.305 0.584 0.012 0.023 c 1.143 1.397 0.045 0.055 d 9.652 10.668 0.380 0.420 e 8.128 9.652 0.320 0.380 e 2.286 2.794 0.090 0.110 l1 14.605 15.875 0.575 0.625 l2 2.286 2.794 0.090 0.110 u 6.223 ref. 0.245 ref. v 7.620 ref. 0.300 ref. 3-lead to- 263 surface mount c b2 a l1 b e e l2 v u d b b1
RT9172 13 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. dimensions in millimeters dimensions in inches symbol min max min max a 1.400 1.800 0.055 0.071 a1 0.020 0.100 0.001 0.004 b 0.600 0.840 0.024 0.033 b 3.300 3.700 0.130 0.146 c 6.700 7.300 0.264 0.287 d 6.300 6.700 0.248 0.264 b1 2.900 3.100 0.114 0.122 e 2.300 0.091 h 0.230 0.350 0.009 0.014 l 1.500 2.000 0.059 0.079 l1 0.800 1.100 0.031 0.043 3-lead sot-223 surface mount package
RT9172 14 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. dimensions in millimeters dimensions in inches symbol min max min max a 4.064 4.826 0.160 0.190 a1 2.032 2.921 0.080 0.115 b 0.635 1.016 0.025 0.040 b2 0.305 0.559 0.012 0.022 c 1.143 1.397 0.045 0.055 e 1.524 1.829 0.060 0.072 d 9.779 10.668 0.385 0.420 e 7.620 9.398 0.300 0.370 e1 11.176 12.954 0.440 0.510 f 14.224 15.113 0.560 0.595 m 3.708 3.962 0.146 0.156 p 24.689 26.416 0.972 1.040 5-lead to-220 plastic package c b2 e a1 a d m p e1 f b e
RT9172 15 ds9172-18 august 2013 www.richtek.com ? copyright 2013 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. dimensions in millimeters dimensions in inches symbol min max min max a 4.064 4.826 0.160 0.190 b 1.143 1.676 0.045 0.066 b 0.660 0.914 0.026 0.036 b2 0.305 0.584 0.012 0.023 c 1.143 1.397 0.045 0.055 d 9.652 10.668 0.380 0.420 e 8.128 9.652 0.320 0.380 e 1.524 1.829 0.060 0.072 l1 14.605 15.875 0.575 0.625 l2 2.286 2.794 0.090 0.110 u 6.223 ref. 0.245 ref. v 7.620 ref. 0.300 ref. 5-lead to-263 plastic surface mount package c b2 a b e v u d e l1 b l2
RT9172 16 ds9172-18 august 2013 www.richtek.com richtek technology corporation 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 richtek products are sold by description only. richtek reserves the right to change the circuitry and/or specifications without notice at any time. customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a richtek product. information furnish ed by richtek is believed to be accurate and reliable. however, no responsibility is assumed by richtek or its subsidiaries for its use; nor for any infringeme nts of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of r ichtek or its subsidiaries. a b j f h m c d i 8-lead sop plastic package dimensions in millimeters dimensions in inches symbol min max min max a 4.801 5.004 0.189 0.197 b 3.810 3.988 0.150 0.157 c 1.346 1.753 0.053 0.069 d 0.330 0.508 0.013 0.020 f 1.194 1.346 0.047 0.053 h 0.170 0.254 0.007 0.010 i 0.050 0.254 0.002 0.010 j 5.791 6.200 0.228 0.244 m 0.400 1.270 0.016 0.050

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