View RT9198T_8112374.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

RT9198T 1 ds9198t-04 april 2011 www.richtek.com 300ma, thermal folded back cmos ldo regulator general description the RT9198T is designed for portable rf and wireless applications with demanding performance and space requirements. the RT9198T performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. regulator ground current increases only slightly in dropout, further prolonging the battery life. the RT9198T also works with low-esr ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. the RT9198T consumes less than 0.01ua in shutdown mode and has fast turn-on time less than 50 s. RT9198T is short circuit thermal folded back protected. RT9198T lowers its otp trip point from 165 c to 110 c when output short circuit occurs (v out < 0.4v) providing maximum safety to end users. the other features include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. available in the sot-23-3 , sot-23-5 and sc-70-5 packages, the RT9198T also offers a range of 1.5v t o 3.5v with 0.1v per step. applications z cdma/gsm cellular handsets z battery-powered equipment z laptop, palmtops, notebook computers z hand-held instruments z pcmcia cards z portable information appliances ordering information marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area. features z z z z z short circuit thermal folded back protection z z z z z low-noise for rf application z z z z z fast response in line/load transient z z z z z quick start-up (typically 50 u s) z z z z z < 0.01ua standby current when shutdown z z z z z low dropout : 220mv @ 300m a z z z z z wide operating voltage ranges : 2.5v to 5.5v z z z z z ttl-logic-controlled shutdown input z z z z z low temperature coefficient z z z z z current limiting protection z z z z z thermal shutdown protection z z z z z only 1 u f output capacitor required for stability z z z z z high power supply rejection ratio z z z z z custom voltage available z z z z z rohs compliant and 100% lead (pb)-free 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. pin configurations (top view) sot-23-3 gnd vout vin 2 3 RT9198T- package type u5 : sc-70-5 u5r : sc-70-5 (r-type) v : sot-23-3 b : sot- 23-5 br : sot- 23-5 (r-type) lead plating system p : pb free g : green (halogen free and pb free) output voltage 15 : 1.5v 16 : 1.6v : 34 : 3.4v 35 : 3.5v 1h : 1.85v 2h : 2.85v
RT9198T 2 ds9198t-04 april 2011 www.richtek.com function block diagram functional pin description pin name pin function en chip enable (active high). note that this pin is high impedance. there should be a pull low 100k resistor connected to gnd when the control signal is floating. nc no connection gnd ground vout output voltage vin input voltage en current-limit and thermal protection mos driver + - vout shutdown and logic control vin error amplifier v ref gnd typical application circuit sot-23-5 /sc-70-5 (r-type) sot-23-5 /sc-70-5 vin gnd vout RT9198T c out 1uf c in 1uf v in v out en chip enable en nc gnd vin vout 4 23 5 vin gnd en vout nc 4 23 5
RT9198T 3 ds9198t-04 april 2011 www.richtek.com absolute maximum ratings (note 1) z supply input voltage ---------------------------------------------------------------------------------------------------- 6v z power dissipation, p d @ t a = 25 c sot-23-3 ------------------------------------------------------------------------------------------------------------------- 0.4w sot-23-5 ------------------------------------------------------------------------------------------------------------------- 0.4w sc-70-5 -------------------------------------------------------------------------------------------------------------------- 0.3w z package thermal resistance (note 2) sot-23-3 , ja ------------------------------------------------------------------------------------------------------------- 250 c/w sot-23-5, ja ------------------------------------------------------------------------------------------------------------- 250 c/w sc-70-5, ja --------------------------------------------------------------------------------------------------------------- 333 c/w z junction temperature --------------------------------------------------------------------------------------------------- 150 c z lead temperature (soldering, 10 sec.) ----------------------------------------------------------------------------- 260 c z storage temperature range ------------------------------------------------------------------------------------------- ? 65 c to 150 c z esd susceptibility (note 3) hbm (human body mode) --------------------------------------------------------------------------------------------- 2kv mm (machine mode) ---------------------------------------------------------------------------------------------------- 200v recommended operating conditions (note 4) z supply input voltage ---------------------------------------------------------------------------------------------------- 2.5v to 5.5v z operation ambient temperature range ----------------------------------------------------------------------------- ? 40 c to 85 c z operation junction temperature range ----------------------------------------------------------------------------- ? 40 c to 125 c electrical characteristics (v in = v out + 1v, c in = c out = 1uf, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max unit output voltage accuracy v out i out = 1ma ? 2 -- +2 % current limit i lim r load = 1 360 400 -- ma quiescent current i q v en >= 1.2v, i out = 0ma -- 90 130 ua i out = 200ma -- 170 200 dropout voltage (note 5) v drop i out = 300ma -- 220 330 mv line regulation v line v in = (v out + 1v) to 5.5v, i out = 1ma -- -- 0.3 % load regulation v load 1ma < i out < 300ma -- -- 0.6 % standby current i stby v en = gnd, shutdown -- 0.01 1 ua en input bias current i ibsd v en = gnd or vin -- 0 100 na logic-low voltage v il v in = 3v to 5.5v, shutdown -- -- 0.4 en threshold logic-high voltage v ih v in = 3v to 5.5v, start-up 1.2 -- -- v f = 100hz -- ? 60 -- power supply rejection rate f = 10khz psrr c out = 1uf, i out = 100ma -- ? 30 -- db thermal shutdown temperature t sd -- 165 -- c thermal shutdown temperature hysteresis t sd -- 30 -- c thermal folded back -- 110 -- c
RT9198T 4 ds9198t-04 april 2011 www.richtek.com note 1. stresses listed as the above "absolute maximum ratings" may cause permanent damage to the device. these are for stress ratings. functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. note 2. 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. note 3. devices are esd sensitive. handling precaution is recommended. note 4. the device is not guaranteed to function outside its operating conditions. note 5. the dropout voltage is defined as v in -v out , which is measured when v out is v out(normal) ? 100mv.
RT9198T 5 ds9198t-04 april 2011 www.richtek.com typical operating characteristics en pin shutdown threshold vs. temperature 0.25 0.5 0.75 1 1.25 1.5 -50 -25 0 25 50 75 100 125 temperature en pin threshold voltage (v) ( c) RT9198T-15pu5 v in = 3.3v c in = c out = 1uf psrr -80 -60 -40 -20 0 20 0.01 0.1 1 10 100 1000 frequency (khz) psrr (db) v out = 2.5v i load = 10ma i load = 100ma c in = c out = 1uf , x7r 10 100 1k 10k 100k 1m (hz) current limit vs. input voltage 300 350 400 450 500 550 600 22.533.544.555.566.5 input voltage (v) current limit (ma) RT9198T-15pb c in = c out = 1uf quiesent current vs. temperature 60 65 70 75 80 85 90 95 100 -50 -25 0 25 50 75 100 125 temperature quiescent current (ua) ( c) RT9198T-15pb v in = 3.3v c in = c out = 1uf output voltage vs. temperature 1.6 1.7 1.8 1.9 2 -50 -25 0 25 50 75 100 125 temperature output voltage (v) ( c) v in = 5v c in = c out = 1uf no load dropout voltage vs. load current 0 50 100 150 200 250 300 0 0.05 0.1 0.15 0.2 0.25 0.3 load current (a) dropout voltage (mv) RT9198T-33pb c in = c out = 1uf t j = 125 c t j = 25 c t j = -40 c
RT9198T 6 ds9198t-04 april 2011 www.richtek.com time (100 s/div) c in = c out = 1uf line transient response output voltage deviation (mv) input voltage deviation (v) i load = 50ma 5 4 3 20 0 -20 time (10 s/div) v in = 5v c in = c out = 1uf start up en pin voltage (v) output voltage (v) v out = 1.8v i load = 1ma 10 5 0 2 1 0 time (1ms/div) v in = 5v c in = c out = 1uf en pin shutdown response en pin voltage (v) output voltage (v) v out = 1.8v i load = 1ma 10 5 0 2 1 0 time (100 s/div) c in = c out = 1uf line transient response output voltage deviation (mv) input voltage deviation (v) i load = 250ma 5 4 3 50 0 -50 time (100 s/div) v in = 3.3v c in = c out = 1uf load transient response output voltage deviation (mv) load current (ma) v out = 1.5v i load = 1ma to 250ma 400 200 0 50 0 -50 time (100 s/div) v in = 3.3v c in = c out = 1uf load transient response output voltage deviation (mv) load current (ma) v out = 1.5v i load = 1ma to 50ma 100 50 0 50 0 -50
RT9198T 7 ds9198t-04 april 2011 www.richtek.com time (5ms/div) v in = 4.5v c in = c out = 1uf noise noise ( v) v out = 1.8v i load = 150ma 400 200 0 -200 -400 f = 10hz to 100khz time (5ms/div) v in = 4.5v c in = c out = 1uf noise noise ( v) v out = 1.8v no load 400 200 0 -200 -400 f = 10hz to 100khz
RT9198T 8 ds9198t-04 april 2011 www.richtek.com applications information like any low-dropout regulator, the external capacitors used with the RT9198T must be carefully selected for regulator stability and performance. using a capacitor whose value is > 1 f on the RT9198T input and the amount of capacitance can be increased without limit. the input capacitor must be located a distance of not more than 0.5 inch from the input pin of the ic and returned to a clean analog ground. any good quality ceramic or tantalum can be used for this capacitor. the capacitor with larger value and lower esr (equivalent series resistance) provides better psrr and line-transient response. the output capacitor must meet both requirements for minimum amount of capacitance and esr in all ldos application. the RT9198T is designed specifically to work with low esr ceramic output capacitor in space-saving and performance consideration. using a ceramic capacitor whose value is at least 1 f with esr is > 20m on the RT9198T output ensures stability. the RT9198T still works well with output capacitor of other types due to the wide stable esr range. figure 1. shows the curves of allowable esr range as a function of load current for various output capacitor values. output capacitor of larger capacitance can reduce noise and improve load transient response, stability, and psrr. the output capacitor should be located not more than 0.5 inch from the v out pin of the RT9198T and returned to a clean analog ground. thermal considerations thermal protection limits power dissipation in RT9198T. 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. RT9198T lowers its otp trip level from 165 c to 110 c when output short circuit occurs (v out < 0.4v) as shown in figure 2. this limits ic case temperature under 100 c and provides maximum safety to end users when output short circuit occurs. figure 1 enable function the RT9198T features an ldo regulator enable/disable function. to assure the ldo regulator will switch on, the en turn on control level must be greater than 1.2 volts. the ldo regulator will go into the shutdown mode when the voltage on the en pin falls below 0.4 volts. for to protecting the system, the RT9198T have a quick- discharge function. if the enable function is not needed in a specific application, it may be tied to v in to keep the ldo regulator in a continuously on state. figure 2. short circuit thermal folded back protection when output short circuit occurs v out short to gnd 0.4v v out i out tsd otp trip point 165 c 110 c 110 c 80 c ic temperature region of stable c out esr vs. load current 0.00 0.01 0.10 1.00 10.00 100.00 0 50 100 150 200 250 300 load current (ma) c out esr ( ? ) c out = 1uf instable stable 100 10 1 RT9198T-15pu5 c in = 1 f, x7r simulation verify
RT9198T 9 ds9198t-04 april 2011 www.richtek.com figure 3. derating curve for packages 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 RT9198T, 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 sc-70 package is 333 c/w, 250 c/w is for sot-23-3 and sot-23-5 package on standard jedec 51-3 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 = 400 mw ( sot-23-3 / sot-23-5) p d(max) = (125 c ? 25 c)/333 = 300 mw (sc-70-5) the maximum power dissipation depends on opera ting ambient temperature for fixed t j(max) and thermal resistance ja . for RT9198T packages, the figure 3. of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. 0 50 100 150 200 250 300 350 400 450 0 25 50 75 100 125 ambient temperature (c ) maximum power dissipation (mw ) sot-23-3 , sot-23-5 sc 70-5
RT9198T 10 ds9198t-04 april 2011 www.richtek.com outline dimension 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
RT9198T 11 ds9198t-04 april 2011 www.richtek.com a a1 e b b d c h l sot - 23 - 5 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 0.559 0.014 0.022 c 2.591 2.997 0.102 0.118 d 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 h 0.080 0.254 0.003 0.010 l 0.300 0.610 0.012 0.024
RT9198T 12 ds9198t-04 april 2011 www.richtek.com information that is provided by richtek technology corporation is believed to be accurate and reliable. richtek reserves the ri ght to make any change in circuit design, specification or other related things if necessary without notice at any time. no third party intellectual property inf ringement of the applications should be guaranteed by users when integrating richtek products into any application. no legal re sponsibility for any said applications i s assumed by richtek. richtek technology corporation headquarter 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 fax: (8863)5526611 richtek technology corporation taipei office (marketing) 5f, no. 95, minchiuan road, hsintien city taipei county, taiwan, r.o.c. tel: (8862)86672399 fax: (8862)86672377 email: marketing@richtek.com a a1 e b b d c h l sc - 70 - 5 surface mount package dimensions in millimeters dimensions in inches symbol min max min max a 0.800 1.100 0.031 0.044 a1 0.000 0.100 0.000 0.004 b 1.150 1.350 0.045 0.054 b 0.150 0.400 0.006 0.016 c 1.800 2.450 0.071 0.096 d 1.800 2.250 0.071 0.089 e 0.650 0.026 h 0.080 0.260 0.003 0.010 l 0.210 0.460 0.008 0.018

▲Up To Search▲

Price & Availability of RT9198T

	To Download RT9198T Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .