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unisonic technologies co., ltd ur13318 linear integrated circuit www.unisonic.com.tw 1 of 6 copyright ? 2007 unisonic technologies co., ltd qw-r102-018.d 2 channel low-dropout voltage regulator ? features *dual output: 3.3v/1a, 1.8v/1a. *output voltage precision of 2%. *output consists of pnp power transistor with low-dropout voltage. *built-in over current protection circuit (ocp). *built-in thermal shut down circuit (tsd). *ideal for hard disk drives applications. 1 to-252-5 to-263-5 1 *pb-free plating product number: ur13318l ? ordering information ordering number normal lead free plating package packing ur13318-tn5-r ur13318l-tn5-r to-252-5 tape reel ur13318-tn5-t ur13318l-tn5-t to-252-5 tube ur13318-tq5-r UR13318L-TQ5-R to-263-5 tape reel ur13318-tq5-t ur13318l-tq5-t to-263-5 tube
ur13318 linear integrated circuit unisonic technologies co., ltd 2 of 6 www.unisonic.com.tw qw-r102-018.d ? block diagram reference voltage current limit sat. prevention sat. prevention thermal shut down vo 2 nc pin 5 pin 2 pin 4 vo 1 vcc vcc current limit vcc vcc vcc pin 1 pin 3 gnd + - + - ? pin discription pin no. pin name function 1 vcc power supply 2 n.c. not internally connected 3 gnd ground 4 vo1 3.3v output 5 vo2 1.8v output
ur13318 linear integrated circuit unisonic technologies co., ltd 3 of 6 www.unisonic.com.tw qw-r102-018.d ? absolute maximum ratings (ta=25
) parameter symbol ratings unit supply voltage vcc 18 v ta=25
1000 mw power dissipation derating above 25 c p d 8 mw/ c junction temperature t j +150 c operating temperature t opr -40 ~ +85 c storage temperature t stg -55 ~ +150 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only an d functional device operat ion is not implied. ? recommended operating ratings (ta=25
) parameter symbol min max unit input voltage vcc 3.0 16.0 v 3.3v output current i o1 1 a 1.8v output current i o2 1 a ? electrical characteristics (refer to the test circuit, ta=25 , v cc =5v unless otherwise specified.) parameter symbol test conditions min typ max unit bias current i bias i o1 =0ma, i o2 =0ma 0.8 1.5 ma 3.3v output output voltage 1 v o1 i o1 =500ma 3.234 3.30 3.366 v dropout voltage 1 v ? d1 i o1 =500ma 0.25 0.5 v peak output current 1 i o1 1.0 1.7 a ripple rejection 1 r.r.1 f=120hz, ein=1vrms i o1 =200ma 50 58 db line regulation 1 v ? line1 vcc=4v ~ 16v, i o1 =500ma 5 30 mv load regulation 1 v ? load1 i o1 =0ma ~ 1a 30 75 mv temperature coefficient of output voltage 1 (note1) t cvo1 i o1 =5ma, t j =0 ~ 125
0.01 %/
short circuit output current 1 i os1 vcc=16v 270 ma 1.8v output output voltage 2 v o2 i o2 =500ma 1.764 1.80 1.832 v peak output current 2 i o2 1.0 1.7 a ripple rejection 2 r.r.2 f=120hz, ein=1vrms i o2 =200ma 50 58 db line regulation 2 v ? line2 vcc=4v ~ 16v, i o2 =500ma 5 30 mv load regulation 2 v ? load2 i o2 =0ma ~ 1a 30 75 mv temperature coefficient of output voltage 2 (note1) t cvo2 i o2 =5ma, t j =0 ~ 125
0.01 %/
short circuit output current 2 i os2 vcc=16v 270 ma note: 1. design guarantee. (outgoing in spection is not done on all products.) 2. this product is not designed for protection against radioactive rays. 3. all characteristic are measured with a capacity across the input (0. 33f) and the output (22f). measurement is done at t a &? t j , and variations in the parameter of all measurement (except for temperature coefficient of output voltage)caused by temperature change are not considered.
ur13318 linear integrated circuit unisonic technologies co., ltd 4 of 6 www.unisonic.com.tw qw-r102-018.d ? application circuit vo 1 vo 2 gnd vcc 22 0 f or 10 0 f ceramic 1 $ 22 0 f + + 1 $ or 10 0 f ceramic ? test circuit for each condition for ripple rejection ratio vo 1 vo 2 gnd vcc 22 f io + 0.33 f v ein v in or
ur13318 linear integrated circuit unisonic technologies co., ltd 5 of 6 www.unisonic.com.tw qw-r102-018.d ? application information operation supply voltage range the circuit functionality is guaranteed within operation of ambient temperature range, as long as it is within operation supply voltage range. the standar d electrical characteristic values are guaranteed at the test circuit voltage of vcc=5v. the cannot be guarant eed at other voltages in the operating range of 3. 0v~16.0v, however, the variation will be small. input /output characteristic dropout region regulation region recommended operating region off region v out 2v 3v (typ.t a =25
) v in for proper regulation, this device must be operated in the recommended operating region shown above. power dissipation refer to the thermal duration characterist ics shown in fig.3. also, be sure to use this ic within a power dissipation rage allowing enough margins. output and bypass capacitor to prevent oscillations, place the output capacitor betwe en the output pin and gnd for both channel. there is a possibility for oscillation if capacitor's value changes due to temperature, volt age, etc. more than 22f electrolytic capacitor is recommended. if an extremel y large value of (over 1000f) is used, it may cause oscillations at low frequency. in case of using ceramic capacitor (it is recommended more than 10f) connect with 1 ? resistance serially as esr. for the bypass capacitor, a 0.33f capacit or placed as close to vcc pin and gnd pin as possible is recommended. over- current protection circuit the over-current protection circuits ar e built in at the outputs. they prot ect the ic from being damaged when the load is short-circuited or subjected to an over current condition. this prot ection circuits perform holdback current limiting. thermal protection circuit a thermal shut down circuit (t.s.d.) is built into the ic to prevent damage due to over heating, therefore, all the outputs are turned off when the t.s.d. circuit is activat ed and are turned on when the temperature recedes to the specified level. however, the t.s.d. circuit is only for extreme conditions and the regulator circuit should still be designed for the ic not to exceed t j(max) =150 .
grounding it is recommended that every capacitor (bypass and output capacitors) is grounded to pin3 using single-point connections. electromagnetic fields the ic is susceptible to strong electromagnetic fields and may cause malfunction. t herefore, caution should be used when placing it on the pcb. protection diodes it is recommended that protection diodes be used when the output is connected to an inductive load.
ur13318 linear integrated circuit unisonic technologies co., ltd 6 of 6 www.unisonic.com.tw qw-r102-018.d utc assumes no respon sibility for equipment failures that result fr om 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 writ ten 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.

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