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eup7961 ds7961 ver 1.4 jan. 2009 1 1a ultra low-dropout linear regulator description the eup7961 is a 1a low-dropout linear regulator that provides a low voltage, high current output with minimum external componen ts. the features include precision output voltage, ultra-low dropout voltage, and low ground current. the eup7961 operates from an input of 2.5v to 5.5v. this regulator uses a 1f ceramic input capacitors and a 4.7f ceramic output capacitor to deliver 1a output current. high bandwidth provides excellent transient response. it is designed to power digital circuits requiring low voltage with high currents (i.e., plds, dsps, microcontrollers, etc.). other features include thermal and current limit protection, a logic-control shutdown mode and an error flag output that goes low when the output voltage drops 10% below the nominal value. it is available in fixed output voltages of 1.5v, 1.8v, 2.5v, 3.3v or adjustable output voltage with a 0.8v feedback voltage. the adjustable output voltage can be set from 0.8v to 4.5v. typical application circuit features z 1a guaranteed output current z 300mv dropout voltage at 1a output z stable with ceramic capacitors z 1.8% output voltage accuracy z 300a low-ground pin current 0.1a quiescent current in shutdown mode z excellent line and load regulation z thermal shutdown and current limit protection z error flag indication z available in sot223, sop-8 and sot-89 packages z rohs compliant and 100% lead (pb)-free applications z supply for low-voltage digital ic z pc add-in cards z high efficiency linear power supplies z post regulator figure1.
eup7961 ds7961 ver 1.4 jan. 2009 2 block diagram figure2. pin configurations package type pin configurations package type pin configurations sot223-3 sot223-3 (b) sot223-3 (c) sot-89 sop-8
eup7961 ds7961 ver 1.4 jan. 2009 3 pin description pin sot-223 sot-223 (b) sot-223 (c) sot-89 sop-8 description v en - - - - 1 enable input. logic high=enable, logic low=shutdown v in 1 3 2 3 2 input voltage of the ldo gnd 2 1 1 2 5,6,7,8 ground: tab is connected to ground v out 3 2 3 1 3 output voltage of the ldo erro r erro r flag output. active-low indicated an output fault condition adj - - - - 4 adjustable regulator feedback input. connect to resistor voltage divider ordering information order number package type marking operating temperature range eup7961-15bir1 sot223 xxxxx p7961c -40 c to +85c eup7961-18bir1 sot223 xxxxx p7961d -40 c to +85c eup7961-25bir1 sot223 xxxxx p7961b -40 c to +85c eup7961-33bir1 sot223 xxxxx p7961h -40 c to +85c eup7961b-15bir1 sot223 xxxxx 7961cb -40 c to +85c eup7961b-18bir1 sot223 xxxxx 7961db -40 c to +85c eup7961b-25bir1 sot223 xxxxx 7961bb -40 c to +85c eup7961b-33bir1 sot223 xxxxx 7961hb -40 c to +85c eup7961c-15bir1 sot223 xxxxx 7961c 1c -40 c to +85c eup7961c-18bir1 sot223 xxxxx 7961c 1d -40 c to +85c eup7961c-25bir1 sot223 xxxxx 7961c 1b -40 c to +85c EUP7961C-33BIR1 sot223 xxxxx 7961c 1h -40 c to +85c eup7961-15cir1 sot-89 xxxxx p7961c -40 c to +85c eup7961-18cir1 sot-89 xxxxx p7961d -40 c to +85c eup7961-25cir1 sot-89 xxxxx p7961b -40 c to +85c eup7961-33cir1 sot-89 xxxxx p7961h -40 c to +85c
eup7961 ds7961 ver 1.4 jan. 2009 4 ordering information (continued) order number package type marking operating temperature range eup7961-15dir1 sop-8 xxxxx eup7961 c -40 c to +85c eup7961-18dir1 sop-8 xxxxx eup7961 d -40 c to +85c eup7961-25dir1 sop-8 xxxxx eup7961 b -40 c to +85c eup7961-33dir1 sop-8 xxxxx eup7961 h -40 c to +85c eup7961dir1 sop-8 xxxxx eup7961 a -40 c to +85c eup7961- ?? ?? ?? ?? ?? ?? lead free code 1: lead free 0: lead packing r: tape & reel operating temperature range i: industry standard package type: b: sot223 c: sot89 d: sop output voltage
eup7961 ds7961 ver 1.4 jan. 2009 5 absolute maximum ratings (1) ? v in ,v out to gnd -------------------------------------------------------------------- -0.3v to 6v ? other pins to gnd ------------------------------------------------------------------ -0.3v to 6v ? package thermal resistance sot-223, ja ---------------------------------------------------------------------- 115c /w sop-8, ja ------------------------------------------------------------------------- 125c /w ? power dissipation, pd@t a = +25c sot-223 --------------------------------------------------------------------------- 0.87w sop-8 ------------------------------------------------------------------------------ 0.8w ? maximum junction temperature ---------------------------------------------------- +150c ? storage temperature --------------------------------------------------------- -65c to +150c ? lead temp (soldering 10sec.)------ ----------------------------------------------------- +300c ? esd rating human body model ------------------------------------------------------------------- 2kv recommended operating conditions (2) ? supply voltage v in ---------------------------------------------------------------- 2.5v to 5.5v ? enable input voltage -------------------------------------------------------------- 0v to 5.5v ? operating temperature range --------------------------------------------- -40c to +85c note (1): stress beyond those listed under ?absolute maximum ratings? may damage the device. note (2): the device is not guaranteed to function outside the recommended operating conditions. electrical characteristics specifications in standard type face are for t a = +25c, and those with boldface type apply over the full operating temperature range t a = -40c to +85c. v in =v out(nom) +1v, v en ? 5v, i l =10ma, c in =c out =4.7f unless otherwise specified. eup7961 symbol parameter conditions min typ max. unit v out +1v v in 5.5v 10ma i l 1a t a = +25c -1.8 1.8 output voltage tolerance v out +1v v in 5.5v 10ma i l 1a t a = -40c ~ +85c -3 3 % line regulation v out +1v v in 5.5v 0.1 0.24 % g v out load regulation 10ma i l 1a 0.08 0.32 % i l = 100ma 35 50 v in -v out dropout voltage i l = 1a 300 500 mv i l = 10ma 300 360 ground pin current in normal operation mode i l = 1a 500 600 a i gnd ground pin current in shutdown mode v en 0.3v 0.01 10 a i o(pk) peak output current v o v o(nom) -4% 1.1 1.5 a short circuit protection i sc short circuit current 1.2 1.7 a
eup7961 ds7961 ver 1.4 jan. 2009 6 electrical characteristics (continued) specifications in standard type face are for t a = +25c, and those with boldface type apply over the full operating temperature range t a = -40c to +85c. v in =v out(nom) +1v, v en ? 5v, i l =10ma, c in =c out =4.7f unless otherwise specified. eup7961 symbol parameter conditions min typ max. unit v ih output = high 1.4 v in v il enable threshold output = low 0 0.3 v t doff turn-off delay i l = 1a 20 50 t don turn-on delay i l = 1a 20 50 s i en v en pin input current v en =v in -1 1 a erro r flag v t threshold 8 10 12 % v th threshold hysteresis 5 % v ef(sat) error flag saturation i sink =100a 0.02 0.1 v td flag reset delay 1 s i ik error flag pin leakage current 1 na i max error flag pin sink current v error =0.5v 3.8 ma ac parameters psrr ripple rejection v in =v out +1v c out =10uf v out =3.3v, f=120hz 60 db e n output noise voltage bw=10hz -100khz v out =2.5v 150 v(rms) over temperature protection tsh (t) shutdown threshold 150 c tsh (h) thermal shutdown hysteresis 10 c
eup7961 ds7961 ver 1.4 jan. 2009 7 typical operating characteristics
eup7961 ds7961 ver 1.4 jan. 2009 8 typical operating characteristics (continued)
eup7961 ds7961 ver 1.4 jan. 2009 9 application note input capacitor an input capacitance of 1 f is required between the eup7961 input pin and ground (the amount of the capacitance may be increased without limit).this capacitor must be located very close to the input pin and returned to a clean analog ground. any good quality ceramic, tantalum, or film cap acitor can be used at the input. if a tantalum capacitor is used at the input, it must be guaranteed by the manufacturer to have a surge current rating sufficient for the ap plication. there are no requirements for the esr on the input capacitor, but tolerance and temperature coef ficient must be considered when selecting the capacitor to ensure the capacitance will be 1f over the entire operating temperature range. output capacitor the eup7961 is designed specifically to work with small ceramic output capacitors. a ceramic capacitor (temperature characteristics x7 r, x5r, z5u, or y5v) in 4.7f to 22f range with 5m ? to 200m ? esr range is suitable in the eup7961 application circuit. the output capacitor must meet the requirement for minimum 4.7f over the entire operating range and also have an esr (equivalent series resistance) value which is within a stable range (5m ? to 200m ? ) no-load stability the eup7961 will remain stable and in regulation with no external load. this is specially important in cmos ram keep-alive applications. on/off input operation the eup7961 is turned off by pulling the v en pin low, and turned on by pulling it high. if this feature is not used, the v en pin should be tied to v in to keep the regulator output on at all time. to assure proper operation, the signal source used to drive the v en input must swing above and below the specified turn-on/off voltage thresholds listed in the electrical characteristics section under v il and v ih . erro r flag operation the eup7961 produces a logic low signal at the error flag pin when the output drops out of regulation due to low input voltage, current limiting, or thermal limiting. this flag has a built in hysteresis. the error is an open drain output. hence, the erro r pin should be pulled high through a pull up resistor. the error pin must be connected to ground if this function is not used. in shutdown, the error pin is hi-z state to save input power. adjustable operation the adjustable version of the eup7961 has an output voltage range of 0.8v to 4.5v. the output voltage of the eup7961 adjustable regulator is programmed using an external resistor divider as shown in figure3. the output voltage is calculated using: where: vref= 0.8v typ. (the internal reference voltage) utilize the following equation for adjusting the output to a particular voltage: choose r 2 =50k to optimize accuracy, power supply rejection, noise and power consumption. power dissipation eup7961 can deliver a continuous current of 2a over the full operating temperature range. a heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. under all possible conditions, the junction temperature must be within the range specified under operating conditions. the total power dissipation of the device is given by: ( ) ( ) + ? = where i gnd is the operating ground current of the device (specified under electrical characteristics). the maximum allowable temperature rise (t rmax ) depends on the maximum ambient temperature (t amax ) of the application, and the maximum allowable junction temperature (t jmax ): t rmax = t jmax -t amax the maximum allowable value for junction to ambient thermal resistance, ja , can be calculated using the formula: ja =t rmax /p d ) r r (1 v v 2 1 ref o + = ? ? ? ? ? ? ? ? ? = 1 0.8v v r p o 2 i
eup7961 ds7961 ver 1.4 jan. 2009 10 pcb layou t good pcb layout practices must be used, otherwise instability can be induced b ecause of ground loops and voltages drops. the input and output capacitors must be directly connected to the input, output, and ground pins of the regulator using traces which do not have other currents flowing in them.the best way to do this is to lay out c in and c out near the device with short traces to the v in , v out , and ground pins. the regulator ground pin should be connected to the external circuit ground so that the regulator and its capacitors have a ?single point ground?.
eup7961 ds7961 ver 1.4 jan. 2009 11 packaging information sot223-3 millimeters inches symbols min. max. min. max. a 1.50 1.80 0.059 0.071 a1 0.00 0.10 0.000 0.004 b 0.60 0.80 0.024 0.031 b1 2.90 3.10 0.114 0.122 d 6.50 0.256 e 3.50 0.138 e 2.30 0.090 h 6.70 7.30 0.264 0.287 l 0.80 1.10 0.031 0.043
eup7961 ds7961 ver 1.4 jan. 2009 12 sop-8 millimeters inches symbols min. max. min. max. a 1.35 1.75 0.053 0.069 a1 0.10 0.25 0.004 0.010 d 4.90 0.193 e 5.80 6.20 0.228 0.244 e1 3.90 0.153 l 0.40 1.27 0.016 0.050 b 0.31 0.51 0.012 0.020 e 1.27 0.050
eup7961 ds7961 ver 1.4 jan. 2009 13 sot-89 millimeters inches symbols min. max. min. max. a 1.40 1.60 0.055 0.063 l 0.89 1.20 0.035 0.047 b1 0.36 0.48 0.014 0.019 b 0.44 0.56 0.017 0.022 c 0.35 0.44 0.014 0.017 d 4.40 4.60 0.173 0.181 d1 1.35 1.83 0.053 0.072 h 3.94 4.25 0.155 0.167 e 2.29 2.60 0.090 0.102 e 1.50 0.059

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