unisonic technologies co., ltd ule4275 preliminary linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2015 unisonic technologies co., ltd qw-r102-064.a 5-v low-dropout voltage regulator ? description the utc ule4275 is a monolithic integrated low-dropout voltage regulator. the device r egulates an input voltage up to 45v to v out = 5v (typical). the device can drive loads up to 450ma. it also provides overcurrent protection and overtemperature protection for cont rol of the state of the output voltage. the device generates a reset signal for an output voltage, v out,rt , of 4.65v (typical). by t he use of an external delay capacitor, one can program the reset delay time. the input capacitor, c in , compensates for line fluctuation. using a resistor of approximately 1 ? in series with c in dampens the oscillation of input inductance and input capacitance. the output capacitor, c out , stabilizes the regulation circuit. the specification for stability is at c out 22 f and esr 5 ? , within the operating temperature range. stability for electrolytic capacitors specifically is at c out 68f within the operating temperature range. the control amplifier compares a reference voltage to a voltage that is proportional to the output voltage and drives the base of the series transisto r through a buffer. saturation control as a function of the load current prevents any oversaturation of the power element. the device also inco rporates a number of internal circuits for protection against: overload, overtemperat ure, and reverse polarity. ? features * qualified for automotive applications * output voltage 5v 2% * very low current consumption * power-on and undervoltage reset * reset low-level output voltage<1v * very low dropout voltage * internal short-circuit current limiting * reverse-polarity proof ? ordering information ordering number lead free halogen free package packing ULE4275L-TQ5-T ule4275g-tq5-t to-263-5 tube ule4275l-tq5-r ule4275g-tq5-r to-263-5 tape reel (1) t: tube, r: tape reel (2) tq5: to-263-5 (3) l: lead free, g: halogen free and lead free ULE4275L-TQ5-T (1)packing type (2)package type (3)green package
ule4275 preliminary linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r102-064.a ? marking ? pin configuration ? pin description pin no. pin name description 1 in input. connect to ground as close to device as possible, through a ceramic capacitor. 2 reset reset output. open-collector output 3 gnd ground. internally connected to heatsink 4 delay reset delay. connect to ground with a capacitor to set delay time. 5 out output. connect to ground with 22f capacitor, esr<5 ? at 10khz. ? block diagram
ule4275 preliminary linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r102-064.a ? absolute maximum rating (over operating free-air temperature range (unless otherwise noted)) parameter symbol ratings unit in -42~45 v input voltage range (note 1) delay v i -0.3~7 v out -1~16 v output voltage range reset v o -0.3~25 v input current delay i i 2 ma output current i o 5 ma operating junction temperature t j -40~150 c storage temperature t stg -65~150 c human body model (hbm) 6000 v electrostatic discharge machine model (mm) v (esd) 400 v notes: 1. absolute maximum ratings are those values be yond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. 2. all voltage values are with respect to the network ground terminal. ? recommended operating conditions (over operating free-air temperature range (unless otherwise noted)) parameter symbol min typ max unit input voltage v i 5.5 42 v junction temperature t j -40 150 c ? thermal resistance s characteristics parameter symbol ratings unit junction-to-ambient thermal resistance ja 32.8 c/w junction-to-case jc 38 c/w
ule4275 preliminary linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r102-064.a ? electrical characteristics (over recommended operating free-air temperature range, v i =13.5v, t j =-40c~150c (unless otherwise noted) (see test circuit)) parameter symbol test conditions min typ max unit i o =5ma~400ma, v i =6v~28v 4.9 5 5.1 v output voltage v o i o =5ma~200ma, v i =6v~40v 4.9 5 5.1 v output current limit i o 350 700 950 ma t j =25c 150 200 a i o =1ma t j 85c 150 220 a i o =250ma 7.5 18 ma current consumption, i q =i i -i o i q i o =400ma 12 22 ma dropout voltage (note) v do i o =300ma, v do =v i -v o 250 500 mv load regulation i o =5ma~400ma 15 30 mv line regulation ? v i =8v~32v, i o =5ma -15 5 15 mv power-supply ripple rejection psrr f r =100hz, v r =0.5v pp 60 db temperature output-voltage drift t ? v ? o 0.5 mv/k reset switching threshold v o,rt 4.5 4.65 4.8 v reset output low voltage v rol r ext 5k ? , v o >1v 0.2 0.4 v reset output leakage current i roh v roh =5v 0 10 a reset charging current i d,c v d =1v 3 5.5 9 a reset upper timing threshold v du 1.5 1.8 2.2 v reset lower timing threshold v drl 0.2 0.4 0.7 v note: measured when the output voltage v o has dropped 100 mv from the nominal value obtained at v i =13.5v. ? switching characteristics (over operating free-air temperature range (unless otherwise noted) (see figure 1)) parameter symbol test conditions min typ max unit reset delay time t rd c d =47nf 10 16 22 ms reset reaction time t rr c d =47nf 0.5 2 s
ule4275 preliminary linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r102-064.a ? timing diagram v i v o v d v ro t rd t rr < t rr t v q,rt t v du d v d t = i d,c c d v drl t t power-on reset thermal shutdown voltage dip at input undervoltage secondary spike overload at output figure 1. reset timing diagram ? test circuit
ule4275 preliminary linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r102-064.a ? typical application circuit utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
|
