________________________________________________________________________ http://www.union-ic.com rev.01 sep.2010 1/7 um177xx 500ma, micropower, vldo linear regulator um177xx qfn2020-6 general description the um177xx series are vldo (very low dropout) linear regulators designed for low power portable applications. typical output noise is only 75 v rms and maximum dropout is just 400mv at the load current of 500ma.the internal p- channel mosfet pass transistor requires no base current, allowing the device to draw only 100 a during normal operation at the maximum load current of 500ma. other features include high output voltage accura cy, excellent transient response, under voltage lockout, stability with ultra low esr ceramic capacitors as small as 1 f, reverse-battery, short-circuit and thermal overload pr otection and output current limiting. the um177xx series are available in a low profile qfn2020-6 package. applications features z bluetooth/802.11 cards z pdas and notebook computers z portable instruments and battery-powered systems z cellular phones z very low dropout: 400mv(max) at 500ma z maximum input voltage: 6.0v z low noise:75 v rms (10hz to 100khz) z 2.5%voltage accuracy at 500ma z fast transient response z under voltage lockout z fixed output voltage: 3.5v/3.3v/3.0v/2.8v/2.5v/1.8v/1.5v/1.3v/ 1.2v z output current limit z reverse-battery protection z no protection diodes needed z stable with 1 f output capacitor z short-circuit and thermal overload protection z low profile qfn2020-6 package pin configurations top view um177xx m: month code qfn2020-6
________________________________________________________________________ http://www.union-ic.com rev.01 sep.2010 2/7 um177xx ordering information part number output voltage packaging type marking code shipping qty UM17735 3.5v aaz um17733 3.3v aav um17730 3.0v aar um17728 2.8v aaq um17725 2.5v aan um17718 1.8v aak um17715 1.5v aaj um17713 1.3v aad um17712 1.2v qfn2020-6 aac 3000pcs/7inch tape & reel pin description pin number symbol function 1 shdn ___________ shutdown input, active low 2 gnd ground 3 vin power supply 4 vout voltage regulated output 5 nc not connected 6 nc not connected absolute maximum ratings (note 1) symbol parameter value unit v in supply voltage on in pin -7.5 to +7.5 v v shdn ___________ voltage on shdn ___________ pin -0.3 to +7.5 v v out voltage on out pin -0.3 to +7.5 v output short-circuit duration indefinite t j operating junction temperature (notes 2, 3) -40 to +125 c t stg storage temperature range -65 to +150 c t l lead temperature for sold ering 10 seconds +300 c note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: the um177xx is tested and specifi ed under pulse load conditions such that t j t a . the device is guaranteed to meet pe rformance specifications from 0 to 70 . specifications over the ? 40 to 125 operating junction temperature range are assured by design, characterization and correlation with statistical process controls. note 3: this ic includes overtemperature protec tion that is intended to protect the device during momentary overload conditions. junction temperature will exceed 125 when overtemperature protection is active. contin uous operation above the specified maximum operating junction temperature may impair device reliability.
________________________________________________________________________ http://www.union-ic.com rev.01 sep.2010 3/7 um177xx electrical characteristics over recommended operating free-air temp erature range (unless otherwise noted) symbol parameter test conditions min typ max unit v in input voltage range v out + v drop 6.0 v v uvlo input under voltage lockout* v in falling 2.0 2.6 v v in =5.0v,i out =0ma 90 i q operating quiescent current v in =5.0v,i out =500ma 100 a i shdn ___________ shutdown leakage current 1 a esd rating human body mode 2 kv i out output current 500 ma 1ma i out 150ma, t a =+2 5 -1 +1 1ma i out 150ma, t a =-40 to +85 -2 +2 output voltage accuracy 1ma i out 500ma, t a =-40 to +85 -2.5 +2.5 % v do dropout voltage i out =500ma 250 400 mv i limt output current limit v in 2.5v 700 ma input reverse leakage current (out to in leakage current) v in =4v, v out =5.5v chip active 0.01 1.5 a t startup time response r l =68 ? , c out =1 f 20 s v il shdn ___________ input low voltage 0.3v in v v ih shdn ___________ input high voltage 0.7v in v shdn ___________ input current shdn ___________ =v in or gnd -1 0.1 +1 a t shdn thermal-shutdown temperature 160 t shdn thermal-shutdown hysteresis 20 line regulation v out +1 v v in v out +2v i out =10ma 0.09 %/v load regulation v in =v out +1v 1ma i out 150ma 0.2 % output voltage noise 10hz to 100khz c in =0.1 f, i out =10ma 75 v r ms f=100hz 70 f=1khz 65 f=10khz 50 psrr power supply ripple rejection v in =v out +1v i out =100ma f=100khz 40 db *only UM17735/um17733/um17730/um17728/um17725 has this function.
________________________________________________________________________ http://www.union-ic.com rev.01 sep.2010 4/7 um177xx typical characteristics (shown for 3.3 v output option) ( cin=1.0uf, cout = 1.0 uf, ta = 25 unless otherwise specified.) 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 3.200 3.225 3.250 3.275 3.300 3.325 3.350 3.375 3.400 figure1. output voltage vs. input voltage i o =500ma output voltage(v) input voltage(v) 0 50 100 150 200 250 300 350 400 450 500 0 50 100 150 200 250 300 350 figure2. dropout voltage vs. output current dropout voltage(mv) output current(ma) 0 50 100 150 200 250 300 350 400 450 500 3.200 3.225 3.250 3.275 3.300 3.325 3.350 3.375 3.400 figure4. output voltage vs. output current output voltage(v) output current(ma) v in =4.2v -40-30-20-10 0 102030405060708090 3.15 3.20 3.25 3.30 3.35 i load =500ma v in =4.2v figure3. output voltage vs. temperature output voltage(v) temperature( o c)
________________________________________________________________________ http://www.union-ic.com rev.01 sep.2010 5/7 um177xx pin function shdn ___________ (pin 1): shutdown, active low. this pin is used to put the um177xx into shutdown. the shdn ___________ pin cannot be left floating and must be tied to the input pin if not used. gnd (pin 2) : ground and heat sink. solder to a ground plane or large pad to maximize heat dissipation. vin (pin 3): power for um177xx and load. power is supp lied to the devices through the in pin. the in pin should be locally bypassed to gro und if the um177xx series are more than a few inches away from another source of bulk capacitan ce. in general, the output impedance of a battery rises with frequency, so it is usually a dvisable to include an input bypass capacitor in battery-powered circuits. a cap acitor in the range of 0.1 f to 1 f is usually sufficient. the um177xx series are designed to withstand reverse voltages on the in pin with respect to both ground and the output pin. in the case of a reve rsed input, which can happen if a battery is plugged in backwards, the um177xx will act as if ther e is a large resistor in series with its input with only a small amount of current flow. vout (pin 4): voltage regulated output. the out pin supplies power to the load. a minimum output capacitor of 1 f is required to ensure stability. larg er output capacitors may be required for applications with large transient loads to lim it peak voltage transients. see the applications information section for more information on output capacitance. nc (pin 5 6): not connected. typical application circuit
________________________________________________________________________ http://www.union-ic.com rev.01 sep.2010 6/7 um177xx package information um177xx: qfn2020-6 outline drawing dimensions millimeters symbol min typ max a 0.57 0.60 0.63 a1 0 0.03 0.05 a3 0.15typ b 0.20 0.25 0.30 d 1.95 2.00 2.075 e 1.95 2.00 2.075 d2 1.45 1.55 1.65 e2 0.76 0.86 0.96 e 0.65typ l 0.30 0.35 0.40 land pattern notes: 1. compound dimension: 2.02.0 2. unit: mm; 3. general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation
________________________________________________________________________ http://www.union-ic.com rev.01 sep.2010 7/7 um177xx important notice the information in this document has been ca refully reviewed and is believed to be accurate. nonetheless, this document is subjec t to change without notice. union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contained information, or to notify a person or organization of any update. union rese rves the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. union semiconductor, inc add: 2f, no. 3, lane 647 songtao road, shanghai 201203 tel: 021-51093966 fax: 021-51026018 website: www.union-ic.com
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