View RT9553AGQW_8900508.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

rt9553a ? ds9553a-00 september 2014 www.richtek.com 1 ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. applications ? notebook high accuracy current/voltage sensing and protection ic general description the rt9553a is designed for over-current detection and over-/under-voltage protection. it provides users to set over-current threshold by the ilim pin to compare that senses dropping voltage between csp pin and csn pin. moreover, users can set over-/under- voltage threshold by the ovset pin/uvset pin to compare with the csp voltage. the rt9553a is a available in the wdfn-10l 3x3 package. simplified application circuit marking information 3u= : product code ymdnn : date code 3u=ym dnn pin configurations (top view) wdfn-10l 3x3 csp vcc timer en csn reset uvset ovset ilim 9 8 7 1 2 3 4 5 10 6 gnd 11 prochot ordering information 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. rt9553a package type qw : wdfn-10l 3x3 (w-type) lead plating system g : green (halogen free and pb free) features ? ? ? ? ? common mode input range up to 24v ? ? ? ? ? vcc operating current : 200 a ? ? ? ? ? vcc shutdown current : 10 a (under s3/s4/s5) ? ? ? ? ? programmable over-current level ? ? ? ? ? one shot prochot signal when ocp ? ? ? ? ? pull low reset signal when ovp/uvp ? ? ? ? ? ovp/uvp with 8% recover hysteresis range ? ? ? ? ? programmable ovp/uvp de-glitch time csn rt9553a reset csp output input i sense prochot vcc en ilim ovset uvset timer r sense enable
rt9553a 2 ds9553a-00 september 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. functional pin description pin no. pin name pin function 1 csp positive current sense input. 2 vcc power supply input. connect this pin to 5v and place a minimum 0.1 ? f decoupling capacitor. the decoupling capacitor should be placed to this pin as close as possible. 3 ilim over-current trip point setting input. the setting range is from 0.4v to 2v. 4 en enable control input. 5 timer deglitch time setting of ov/uv protection. connect a resistor from this pin tied to gnd to set deglitch time. do not parallel any filter capacitor to this pin. 6 uvset under-voltage trip point setting input. the setting range is from 0.55v to 3v. 7 ovset over-voltage trip point setting input. the setting range is from 0.55v to 3v. 8 reset open-drain output. connect to an external resistor to pull high. when ov/uv occurs, this pin will be pulled low. 9 prochot open-drain output. connect to an external resistor to pull high. when oc occurs, this pin will be pulled low. 10 csn negative current sense input. 11 (exposed pad) gnd ground. the exposed pad must be soldered to a large pcb and connected to gnd for maximum power dissipation. function block diagram por latch reset gnd ov_comparator prochot deglitch + - + - uv_comparator r2 r1 one shot + - oc_comparator + - current sensing amplifier vron uvset ovset ilim csn csp vcc en timer
rt9553a 3 ds9553a-00 september 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. ovp/uvp deglitch time the output signal of ov_comoparator or uv_comparator is delayed by deglitch timer. the delayed time is decided by the resistor (see spec.) connected to the timer pin. over-/under-voltage protection the ovset voltage is set by users and it compares with the voltage which is 1/9 of csp voltage with ov_comparator. the uvset voltage is set by users and it also compares with the voltage which is 1/9 of csp voltage with uv_comparator. either the output of ov_comoparator or uv_comparator is high, the reset voltage is pulled low. operation the rt9553a consists of a current sensing amplifier, and two comparators, and it provides the following functions : over-current protection, over-voltage protection and under- voltage protection. over-current protection with m order of resistor shunts between csp and csn, the current sensing amplifier multiplies the voltage between csp and csn by 20 and compares the result with the ilim voltage. if the output voltage of current sensing amplifier is larger than the ilim voltage, the prochot voltage is pulled low.
rt9553a 4 ds9553a-00 september 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. electrical characteristics (v cc = 5v, t a = 25 c, unless otherwise specified) absolute maximum ratings (note 1) ? csp/csn to gnd --------------------------------------------------------------------------------------------------------- ? 0.3v to 28v ? vcc, ilim, en, uvset, ovset, reset, prochot to gnd ------------------------------------------------- ? 0.3v to 6v ? power dissipation, p d @ t a = 25 c wdfn-10l 3x3 ------------------------------------------------------------------------------------------------------------- 3.27w ? package thermal resistance (note 2) wdfn-10l 3x3, ja ------------------------------------------------------------------------------------------------------- 30.5 c/w wdfn-10l 3x3, jc ------------------------------------------------------------------------------------------------------- 7.5 c/w ? lead temperature (soldering, 10 se c.) ------------------------------------------------------------------------------- 260 c ? junction temperature ----------------------------------------------------------------------------------------------------- 150 c ? storage temperature range -------------------------------------------------------------------------------------------- ? 65 c to 150 c ? esd susceptibility (note 3) hbm (human body model) ---------------------------------------------------------------------------------------------- 2kv mm (ma chine model) ----------------------------------------------------------------------------------------------------- 200v recommended operating conditions (note 4) ? high-side voltage, vcsp/vcsn -------------------------------------------------------------------------------------- 5v to 24v ? supply voltage, vcc ----------------------------------------------------------------------------------------------------- 4.5v to 5.5v ? junction temperature range -------------------------------------------------------------------------------------------- ? 40 c to 125 c ? ambient temperature range -------------------------------------------------------------------------------------------- ? 40 c to 85 c parameter symbol test conditions min typ max unit csn csp input input voltage range v csp , v csn 5 -- 24 v i csn + i csp vcc = 5v, en high -- 50 -- ? a vcc = 5v, en low -- -- 5 vcc input vcc operating current i vcc -- 200 -- ? a vcc shutdown current i vcc_shd -- -- 10 ? a vcc por rising voltage v in_por rising 2.8 -- 3.7 v hysteresis -- 400 -- mv enable enable input voltage logic-high v ih 0.7 -- -- v logic-low v il -- -- 0.3 over current protection system response time -- 50 -- ? s open-drain output duration t prochot 10 -- 18 ms open-drain output ron r on_prochot -- -- 10 ?
rt9553a 5 ds9553a-00 september 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. note 1. stresses beyond those listed ? absolute maximum ratings ? may cause permanent damage to the device. these are stress ratings only, and 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 may affect device reliability. note 2. ja is measured at t a = 25 c on a high effective thermal conductivity four-layer test board per jedec 51-7. jc is measured at the exposed pad of the package. note 3. devices are esd sensitive. handling precaution is recommended. note 4. the device is not guaranteed to function outside its operating conditions. parameter symbol test conditions min typ max unit input current sensing accuracy oc acc v ilim = 0.4v to 2v -- -- 5 % prochot leakage current i leak_prochot en low -- -- 5 ? a ilim leakage current i leak_ilim en low -- -- 5 ? a ilim operation range v ilim 0.4 -- 2 v over-/under-voltage protection ovp accuracy ovp acc v ovset = 0.55v to 3v -- -- 5 % ovp recover hysteresis range v ovset = 0.55v to 3v -- 8 -- % uvp accuracy uvp acc v uvset = 0.55v to 3v -- -- 5 % uvp recover hysteresis range v uvset = 0.55v to 3v -- 8 -- % open drain output ron r on_reset i sink = 10ma -- -- 10 ? reset leakage current i leak_reset en low -- -- 5 ? a ovp/uvp de-glitch time t timer r timer = 375k -- 15 -- ? s r timer = 125k -- 5 --
rt9553a 6 ds9553a-00 september 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical application circuit csn gnd rt9553a 1.05v 100nf vcc reset csp 100nf 10m 100nf i sense 2.2 100nf en 10k 100nf ilim 3.3v 63.4k 37.4k prochot 10k 1.05v 10k ovset uvset 3.3v 20k 82.5k 82.5k 16.5k timer 375k 10 1 2 4 3 5 11 (exposed pad) 9 8 7 6 5v input output 2.2nf 2.2nf 2.2nf
rt9553a 7 ds9553a-00 september 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical operating characteristics time (50 s/div) ovp vs. reset behavior ovset (1v/div) reset (1v/div) v cc = 5v , ovset = 2.6v , v csp from 19v to 25v v csp (7v/div) ovp recovery hysteresis 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 ovset (v) ovp recovery hysteresis (% ) v cc = 5v , ovset = 0.4v to 3v ovp accuracy -5 -4 -3 -2 -1 0 1 2 3 4 5 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 ovset (v) accuracy (%) v cc = 5v , ovset = 0.4v to 3v uvp accuracy -5 -4 -3 -2 -1 0 1 2 3 4 5 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 uvset (v) accuracy (%) v cc = 5v , uvset = 0.4v to 3v ocp accuracy -5 -4 -3 -2 -1 0 1 2 3 4 5 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 ilim (v) accuracy (%) v cc = 5v , r sense = 10m , ilim = 0.4v to 2v uvp recovery hysteresis 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 uvset (v) uvp recovery hysteresis (%) 1 v cc = 5v , uvset = 0.4v to 3v
rt9553a 8 ds9553a-00 september 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. time (1ms/div) mask time v cc = 5v, r sense = 10m , en (5v/div) i load (2a/div) prochot (2v/div) ilim = 1v, i load = 0a to 6a before en high v cc = 5v , uvset = 0.55v , v csp from 7v to 3v time (10 s/div) uvp vs. reset behavior v csp (2v/div) uvset (500mv/div) reset (2v/div) v cc = 5v , ilim = 1v , i load = 0a to 6a time (20 s/div) ocp vs. prochot behavior ilim (1v/div) i load (2a/div) prochot (2v/div)
rt9553a 9 ds9553a-00 september 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. ovset csp r2 v3.3v r1 r2 r2 v3.3v 9 r1 r2 ?? ? ?? ? ? we suggest that the total resistance of divider network should be higher than 100k . v csp is over-voltage protection trigger point. fighre1.setting network of over-voltage protection and under-voltage protection uvset ovset + - + - 1r 8r timer r timer r1 r2 r3 r4 3.3v 3.3v csp v csp under-voltage protection (uvp) the principle of under-voltage protection is the same as over-voltage protection function. the under-voltage protection threshold is set by the uvset pin. when the csp pin voltage is lower the setting threshold at the uvset pin, the under-voltage protection will be triggered, and the reset pin will be pull low after a deglitch time, the reset is resumed when the csp pin voltage up to 8% hysteresis. over-current protection (ocp) as an industry standard, high accuracy current sense amplifier is used to monitor the input current that flows through current sense resistor. the rt9553a detects csp- csn differential voltage across the current sense resistor to monitor input current. the equation of over-current protection is shown as below : ilim sense sense ilim ilim sense sense r6 v3.3v r5 r6 (i r ) 20 v v i 20 r ?? ? ??? ? ? we suggest that the total resistance of divider network should be higher than 100k . i sense is over-current protection trigger point. the 20 is amplification of internal error amplifier. figure 2. setting network of over-current protection csn csp ilim 3.3v r5 r6 i sense r sense application information the rt9553a provides ovp, uvp, ocp protection functions with reset, prochot indicator to inform system. it can be operated minimize external components of switching power supply systems to achieve protection. for easily using and increasing pcb space utilization, the rt9553a is used in notebook applications. over-voltage protection (ovp) the csp pin voltage can be continuously monitored for over-voltage condition. when the csp pin voltage exceeds the setting threshold at the ovset pin, the over-voltage protection will be triggered, and the reset pin will be pull low after a deglitch time, the reset is resumed when the csp pin voltage down to 8% hysteresis. for more details, please refer to the following information. the equation of over-voltage setting threshold is shown as below :
rt9553a 10 ds9553a-00 september 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. reset/timer the reset pin is an open-drain output, and requires to be connected to a pull-up resistor. when over-voltage or under-voltage occurs, the reset pin will be pulled low and resume to high with a hysteresis. users can set the deglitch time of reset by adjusting the timer pin, and there are two choices of deglitch time, 15 s and 5 s. when the r timer is 375k , the deglitch time is 15 s; when the r timer is 125k , the deglitch time is 5 s. users can choose a suitable deglitch time to avoid protection false triggering. figure 4. ovp and reset indicator illustrator v csp x (1/9) en vcc 3ms ovset reset 92%_ovset recovery hysteresis range prochot the prochot pin is an open-drain output, and requires to be connected to a pull-up resistor. when over-current is detected, prochot will be pulled low within 50 s for 15ms. if over-current condition keeps longer than 15ms, prochot maintains low status until over-current protection is released. figure 3, figure 4, figure5 illustrates reset and prochot indicator signals. figure 3. reset and prochot indicator illustration en vcc 3ms ilim i sense 15ms >15ms prochot
rt9553a 11 ds9553a-00 september 2014 www.richtek.com ? copyright 2014 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. thermal considerations for continuous operation, do not exceed absolute maximum junction temperature. the maximum power dissipation depends on the thermal resistance of the ic package, pcb layout, rate of surrounding airflow, and difference between junction and ambient temperature. the maximum power dissipation can be calculated by the following formula : p d(max) = (t j(max) ? t a ) / ja where t j(max) is the maximum junction temperature, t a is the ambient temperature, and ja is the junction to ambient thermal resistance. for recommended operating condition specifications, the maximum junction temperature is 125 c. the junction to ambient thermal resistance, ja , is layout dependent. for wdfn-10l 3x3 package, the thermal resistance, ja , is 30.5 c/w on a standard jedec 51-7 four-layer thermal test board. the maximum power dissipation at t a = 25 c can be calculated by the following formula : p d(max) = (125 c ? 25 c) / (30.5 c/w) = 3.27w for wdfn-10l 3x3 package the maximum power dissipation depends on the operating ambient temperature for fixed t j(max) and thermal resistance, ja . the derating curve in figure 6 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. figure 6. derating curve of maximum power dissipation 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 25 50 75 100 125 ambient temperature (c) maximum power dissipation (w) 1 four-layer pcb layout considerations layout is very important in rt9553a, if designed improperly, the pcb may radiate excessive noise. certain points must be considered before starting a layout for the rt9553a. ? connect a rc low pass filter to vcc. the recommended bom of rc filter is 2.2 and 0.1 f. place the filter capacitor close to the ic. ? current sense connections must always be made using kelvin connections to ensure an accurate signal with the current limit resistor located at the device. ? all sensitive analog traces and components such as csp, csn, vcc, en, prochot, reset and ilim should be placed away form high voltage switching nodes to avoid coupling. figure 5. uvp and reset indicator illustrator en vcc 3ms v csp x (1/9) uvset reset 108%_uvset recovery hysteresis range
rt9553a 12 ds9553a-00 september 2014 www.richtek.com richtek technology corporation 14f, no. 8, tai yuen 1 st 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. outline dimension dimensions in millimeters dimensions in inches symbol min max min max a 0.700 0.800 0.028 0.031 a1 0.000 0.050 0.000 0.002 a3 0.175 0.250 0.007 0.010 b 0.180 0.300 0.007 0.012 d 2.950 3.050 0.116 0.120 d2 2.300 2.650 0.091 0.104 e 2.950 3.050 0.116 0.120 e2 1.500 1.750 0.059 0.069 e 0.500 0.020 l 0.350 0.450 0.014 0.018 w-type 10l dfn 3x3 package 1 1 2 2 note : the configuration of the pin #1 identifier is optional, but must be located within the zone indicated. det ail a pin #1 id and tie bar mark options d 1 e a3 a a1 d2 e2 l b e see detail a

▲Up To Search▲

Price & Availability of RT9553AGQW

	To Download RT9553AGQW Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .