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eup7987 ds7987 ver 1.5 may .2005 1 300ma low-noise ultra low-dropout cmos regulator description the eup7987 low-noise, low-dropout, linear regulator operates from a 2.5v to 5.5v input and is guaranteed to deliver 300ma. the eup7987 is stable with small 2.2f ceramic capacitor. its performance suits battery powered applications because of its shutdown mode (60 na typ), low quiescent current (110a typ), and ldo voltage (140mv typ). the low dropout voltage allows for more utilization of a battery?s available energy by operating closer to its end-of-life voltage. the eup7987 is available in 1.8v, 2.5v, 2.8v, 3v, 3.3v, and adjustable versions. feature z 300ma guaranteed output current (500ma for pulsed loads) z 60db psrr at 1khz z 50 v rms output voltage noise z 140mv dropout at 300ma load z low 110a no-load supply current z 1a shutdown current z fast start-up time z stable with 2.2f ceramic output capacitors z thermal shutdown and short-circuit protection z sot23-5 and sot23-6 package z rohs compliant and 100% lead (pb)-free applications z wireless handsets z dsp core power z battery powered electronics z portable information appliances block diagram figure1.
eup7987 ds7987 ver 1.5 may .2005 2 typical application circuit figure2. fixed-voltage ldo regulator figure3 adjustable ldo regulator programming
eup7987 ds7987 ver 1.5 may .2005 3 pin configurations part number pin configurations eup7987 sot23-5 the set pin is internally disconnected for the fixed versions eup7987 sot23-6 pin description pin sot23-5 sot23-6 description v in 1 1 input voltage of the ldo gnd 2 2 common ground shdn 3 3 shdn places the entire device in shutdown mode when held low. bp 4 4 compensation capacitor for noise reduction set 5 output voltage set. not externally connected for the fixed versions. connect to resistor-divider for adjustable output voltage. v out 5 6 output voltage of the ldo
eup7987 ds7987 ver 1.5 may .2005 4 ordering information order number package type marking operating temperature range eup7987-18vir1 eup7987-18vir0 sot23-5 j1 ?? ?? -40c to 85c EUP7987-25VIR1 eup7987-25vir0 sot23-5 j2 ?? ?? -40c to 85c eup7987-28vir1 eup7987-28vir0 sot23-5 j6 ?? ?? -40c to 85c eup7987-30vir1 eup7987-30vir0 sot23-5 j5 ?? ?? -40c to 85c eup7987-33vir1 eup7987-33vir0 sot23-5 j3 ?? ?? -40c to 85c eup7987vir1 eup7987vir0 sot23-6 ja ?? ?? -40c to 85c eup7987 ?? ?? ?? ?? ?? ?? lead free code 1: lead free 0: lead packing r: tape & reel operating temperature range i: industry standard c: commercial package type v: sot23 output voltage 18: 1.8v 25: 2.5v 28: 2.8v 30: 3.0v 33: 3.3v blank: adjustable
eup7987 ds7987 ver 1.5 may .2005 5 absolute maximum ratings ? v in , v out , shdn v , v set , v cc , ----------------------------------------------------------- -0.3v to 6v ? storage temperature range ------------------------------------------------------------- -65c to 160c ? junction temperature (tj) ------------------------------------------------------------------------ 150c ? lead temperature (10 sec.) ------------------------------------------------------------------------- 260c electrical characteristics unless otherwise specified, all limits guaranteed for v in = v o +0.5v, =v in, c in =c out =2.2f, c cc =22nf, t j =25c. (boldface limits apply for the operating temperature extremes: -40c and 85c) eup7987 symbol parameter conditions min typ max. unit v in input voltage 2.5 5.5 v -2 +2 ? v o output voltage tolerance 100a -3 +3 % of v out(nom) v o output adjust range adjust version only 1.25 5.5 v continuous 300 ma i o maximum output current 10ms pulse 500 ma i limit output current limit 600 ma i out =0ma 110 200 supply current i out =300ma 240 a i q shutdown supply current v o =0v, shdn =gnd 0.06 1 a i out =1ma 0.4 i out =200ma 90 200 v do dropout voltage i out =300ma 140 mv line regulation i out = 1ma, (v o +0.5v) 5.5v -0.1 0.05 0.1 %/v ? v o load regulation 100a 100khz 50 v rms v ih ,(vo+0.5v) 0.4 v shdn i shdn input bias current shdn =gnd or in 0.1 100 na i set set input leakage set = 1.3v, adjust version only 0.1 2.5 na t sd thermal shutdown temperature 160 thermal shutdown hysteresis 20 c t on start-up time c out =10f, v o at 90% of final va l u e 80 s psrr power supply rejection ratio v in =v out +0.5v, f=1khz 60 db shd n v
eup7987 ds7987 ver 1.5 may .2005 6 typical operating characteristics unless otherwise specified, v in = v o + 0.5v, c in =c out = 2.2 f, c cc = 22 nf, t j = 25c, v shdn =v in supply current vs. input voltage(sot25) 0 25 50 75 100 125 150 175 2.6 3 3.4 3.8 4.2 4.6 5 5.4 5.8 input voltage(v) supply current(ua) ta= 25 ta= 85 tj=-40 dropout voltage vs. load current 0 20 40 60 80 100 120 140 160 0 50 100 150 200 250 300 load current(ma) dropout voltage(mv) tj= -40 tj=25 tj=85 supply current vs load current 0 50 100 150 200 250 300 0 50 100 150 200 250 300 load current(ma) supply current (ua) tj=25 tj=85 tj=-40 outp ut voltage change vs temp erature -0.8 -0.6 -0.4 -0.2 0.0 0.2 -55 - 40 -20 0 2 0 50 1 00 1 20 140 temperature vout change (%) input voltage vs output voltage(sot25) 2.3 2.35 2.4 2.45 2.5 2.55 33.544.555.56 vin( v) vo ( v)
eup7987 ds7987 ver 1.5 may .2005 7 output noise (10khz to 100khz) shutdown response
eup7987 ds7987 ver 1.5 may .2005 8 application information external capacitors like any low-dropout regulator, the eup7987 requires external capacitors for regulator stability. the eup7987 is specifically designed for portable applications requiring minimum board space and smallest components. these capacitors must be correctly selected for good performance. input capacitor a minimum input capacitance of 1f is required between the eup7987 input pin and ground (the amount of the capacitance may be increased without limit).this capacitor must be located a distance of not more than 1cm from the input pin and returned to a clean analog ground. any good quality ceramic, tantalum, or film capacitor may be used at the input. if a tantalum capacitor is used at the input, it must be guara nteed by the manufacturer to have a surge current rating sufficient for the application. no-load stability the eup7987 will remain stable and in regulation with no external load. this is specially important in cmos ram keep-alive applications. output capacitance the eup7987 is specifically designed to employ ceramic output capacitors as low as 2.2f. ceramic capacitors below 10f offer significant cost and space savings, along with high frequency noise filtering. higher values and other types and of capacitor may be used, but their equivalent series resistance (esr) should be maintained below 0.5 ? . ceramic capacitor of the value required by the eup7987 are available in the following dielectric types: z5u, y5v, x5r, and x7r. the z5u and y5v types exhibit a 50% or more drop in capacitance value as their temperature increase from 25c, an important consideration. the x5r generally maintain their capacitance value within 20%. the x7r type are desirable for their tighter tolerance of 10% over temperature. noise bypass capacitor an external 10nf bypass capacitor at bp pin conjunction with an internal resistor cr eates lowpass filter. increasing the capacitance will decrease the output noise. this cap is connected directly to a high impedance node in the bandgap reference circuit. any significant loading on this node will cause a change on the regulated output voltage. for this reason, dc leakage current through this pin must be kept as low as possible for best output voltage accuracy. the types of capacitors best suited for the noise bypass capacitor are ceramic and film. unlike many other ldo?s , addition of a noise reduction capacitor does not effect the load transient response of the device. however, it does affect start-up time. the smaller the capacitance value, the quicker the start-up time. power dissipation and junction temperature specified regulator operati on is assured to a junction temperature of 125c; the maximum junction temperature should be restri cted to 125c under normal operating conditions. this rest riction limits the power dissipation the regulator can handle in any given application. to ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, p d(max) , and the actual dissipation, p d , which must be less than or equal to p d(max) the maximum-power-dissipation limit is determined using the following equation: where: t jmax is the maximum allowable junction temperature. r ja is the thermal resistance junction-to-ambient for the package t a is the ambient temperature. the regulator dissipation is calculated using: p d =(v i -v o ) ?? i o power dissipation resulting from quiescent current is negligible. excessive power dissipation triggers the thermal protection circuit. ja a j d(max) r t max t p ? =
eup7987 ds7987 ver 1.5 may .2005 9 adjustable operation the adjustable version of the eup7987 has an output voltage range of 1.25v to 6v. the output voltage of the eup7987 adjustable regulator is programmed using an external resistor divider as shown in figure3. the output voltage is calculated using: where: vref=1.23v typ. (the internal reference voltage) utilize the following equation for adjusting the output to a particular voltage: ? ? ? ? ? ? ? ? ? = 1 1.23v v r p o 2 i choose r 2 =100k to optimize accuracy, power supply rejection, noise and power consumption. in order to improve the stability of the adjustable version, it is suggested that a small compensation capacitor c 1 be placed between v out and set shutdown the eup7987 goes into sleep mode when the shdn pin is in a logic low condition. during this condition, the pass transistor, error amplifier, and bandgap are turned off, reducing the supply current to 60na typical. the shdn pin may be directly tied to v in to keep the part on. fast start-up the eup7987 provides fast start-up time for better system efficiency. the start-up speed is maintained when using the optional noise bypass capacitor. ) r r (1 v v 2 1 ref o + =
eup7987 ds7987 ver 1.5 may .2005 10 packaging information sot23-5 note: 1. package body sizes exclude mold fl ash protrusions or gate burrs. 2. tolerance 0.1000mm (4 mil) unless otherwise specified. 3. coplanarity: 0.1000mm 4. dimension l is measured in gage plane. dimension in millimeters symbols min. nom max. a 1.00 1.10 1.30 a1 0.00 ----- 0.10 a2 0.70 0.80 0.90 b 0.35 0.40 0.50 c 0.12 0.15 0.20 d 2.70 2.90 3.10 e 1.50 1.60 1.70 e ----- 1.90(typ.) ----- h 2.6 2.8 3.00 l 0.37 ----- ----- c1 14 5 9
eup7987 ds7987 ver 1.5 may .2005 11 sot23-6 dimensions in millimeters symbols min. nom. max. a ------ ------ 1.45 a1 ------ ------ 0.15 a2 0.90 1.15 1.30 b 0.30 ------ 0.50 c 0.08 ------ 0.22 d 2.90 bsc e 2.80 bsc e1 1.60 bsc e 0.95 bsc e1 1.90 bsc l 0.30 0.45 0.60 l1 0.60 ref l2 0.25 bsc r 0.10 ------ ------ r1 0.10 ------ 0.25 c 0 4 8 c 1 5 10 15

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