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features portable applications description/ordering information lp2981 100-ma ultra-low dropout regulator with shutdown slvs521d ? july 2004 ? revised july 2007 mobile phones output tolerance of laptops ? 0.75% (a grade) personal digital assistants (pdas) ? 1.25% (standard grade) digital cameras and camcorders ultra-low dropout, typically cd and mp3 players ? 200 mv at full load of 100 ma ? 7 mv at 1 ma wide v in range ? 16 v max low i q ? 600 a typ at full load of 100 ma shutdown current ? 0.01 a typ fast transient response to line and load overcurrent and thermal protection high peak current capability the lp2981 family of fixed-output, low-dropout regulators offers exceptional, cost-effective performance for both portable and nonportable applications. available in fixed voltages of 2.8 v, 3 v, 3.3 v, and 5 v, the family has an output tolerance of 0.75% for the a-grade devices (1.25% for the standard grade) and is capable of delivering 100-ma continuous load current. standard regulator features, such as overcurrent and overtemperature protection, are included. the lp2981 has features that make the regulator an ideal candidate for a variety of portable applications: low dropout: a pnp pass element allows a typical dropout of 200 mv at 100-ma load current and 7 mv at 1-ma load. low quiescent current: the use of a vertical pnp process allows for quiescent currents that are considerably lower than those associated with traditional lateral pnp regulators. shutdown: a shutdown feature is available, allowing the regulator to consume only 0.01 a when the on/ off pin is pulled low. small packaging: for the most space-constrained needs, the regulator is available in the sot-23 package. please be aware that an important notice concerning availability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. production data information is current as of publication date. copyright ? 2004?2007, texas instruments incorporated products conform to specifications per the terms of the texas instruments standard warranty. production processing does not necessarily include testing of all parameters. www.ti.com dbv (sot -23) p ackage (t op view) 12 3 54 v in gnd on/off v out nc nc ? no connect; must be left open
lp2981 100-ma ultra-low dropout regulator with shutdown slvs521d ? july 2004 ? revised july 2007 ordering information (1) v out orderable top-side t j part grade package (2) (nom) part number marking (3) reel of 3000 lp2981a-28dbvr 2.8 v lp6_ reel of 250 lp2981a-28dbvt reel of 3000 LP2981A-29DBVR 2.9 v preview reel of 250 lp2981a-29dbvt reel of 3000 lp2981a-30dbvr a grade: 3 v lp8_ 0.75% tolerance reel of 250 lp2981a-30dbvt reel of 3000 lp2981a-33dbvr 3.3 v lpc_ reel of 250 lp2981a-33dbvt reel of 3000 lp2981a-50dbvr 5 v preview reel of 250 lp2981a-50dbvt ?40 c to 125 c sot-23-5 ? dbv reel of 3000 lp2981-28dbvr 2.8 v lp5_ reel of 250 lp2981-28dbvt reel of 3000 lp2981-29dbvr 2.9 v preview reel of 250 lp2981-29dbvt reel of 3000 lp2981-30dbvr standard grade: 3 v lp7_ 1.25% tolerance reel of 250 lp2981-30dbvt reel of 3000 lp2981-33dbvr 3.3 v lpb_ reel of 250 lp2981-33dbvt reel of 3000 lp2981-50dbvr 5 v preview reel of 250 lp2981-50dbvt (1) for the most current package and ordering information, see the package option addendum at the end of this document, or see the ti web site at www.ti.com . (2) package drawings, standard packing quantities, thermal data, symbolization, and pcb design guidelines are available at www.ti.com/sc/package . (3) the actual top-side marking has one additional character that designates the wafer fab/assembly site. 2 submit documentation feedback www.ti.com
lp2981 100-ma ultra-low dropout regulator with shutdown slvs521d ? july 2004 ? revised july 2007 functional block diagram basic application circuit a. minimum c out value for stability (can be increased without limit for improved stability and transient response) b. on/ off must be actively terminated. connect to v in if shutdown feature is not used. c. pin 4 (nc) must be left open. do not connect anything to this pin. figure 1. 3 submit documentation feedback www.ti.com v out 3.3 m f (see note a) 1 m f (see note a) v in 1 on/off (see note b) 2 gnd 3 5 4 nc(see note c) lp2981 v in v out gnd on/off overcurrent/ overtemperature protection v ref 1.23 v ? + r 1 r 2
absolute maximum ratings (1) recommended operating conditions lp2981 100-ma ultra-low dropout regulator with shutdown slvs521d ? july 2004 ? revised july 2007 over virtual junction temperature range (unless otherwise noted) min max unit v in continuous input voltage range ?0.3 16 v v on/off on/ off input voltage range ?0.3 16 v v o output voltage range (2) ?0.3 9 v v in ? v out input/output voltage differential range (3) ?0.3 16 v internally limited i out output current (4) (short-circuit protected) ja package thermal impedance (4) (5) 206 c/w t j operating virtual junction temperature 150 c t stg storage temperature range ?65 150 c (1) stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) if load is returned to a negative power supply, the output must be diode clamped to gnd. (3) the pnp pass transistor has a parasitic diode connected between the input and output. this diode normally is reverse biased (v in > v out ), but will be forward biased if the output voltage exceeds the input voltage by a diode drop (see application information for more details). (4) maximum power dissipation is a function of t j (max), ja , and t a . the maximum allowable power dissipation at any allowable ambient temperature is p d = (t j (max) ? t a )/ ja . operating at the absolute maximum t j of 150 c can affect reliability. (5) the package thermal impedance is calculated in accordance with jesd 51-7. min max unit v in supply input voltage 2.2 (1) 16 v v on/off on/ off input voltage 0 v in v v in ? v out input-output differential 0.7 11 v i out output current 100 ma t j virtual junction temperature ?40 125 c (1) minimum v in of 2.2 v is needed for proper biasing of ldo control circuitry. 4 submit documentation feedback www.ti.com
electrical characteristics lp2981 100-ma ultra-low dropout regulator with shutdown slvs521d ? july 2004 ? revised july 2007 at specified free-air temperature range, v in = v out(nom) + 1 v, v on/ off = 2 v, c in = 1 f, i l = 1 ma, c out = 4.7 f (unless otherwise noted) lp2981a-xx lp2981-xx parameter test conditions t a unit min typ max min typ max i l = 1 ma 25 c ?0.75 0.75 ?1.25 1.25 output voltage v out 25 c ?1 1 ?2 2 %v nom tolerance i l = 1 ma to 100 ma ?40 c to 125 c ?2.5 2.5 ?3.5 3.5 25 c 0.007 0.014 0.007 0.014 output voltage v in = (v out(nom) + 1 v) to v out / v in %/v line regulation 16 v ?40 c to 125 c 0.032 0.032 25 c 1 3 1 3 i l = 0 ?40 c to 125 c 5 5 25 c 7 10 7 10 i l = 1 ma ?40 c to 125 c 15 15 dropout v in ? v out mv voltage (1) 25 c 70 100 70 100 i l = 25 ma ?40 c to 125 c 150 150 25 c 200 250 200 250 i l = 100 ma ?40 c to 125 c 375 375 25 c 65 95 65 95 i l = 0 ?40 c to 125 c 125 125 25 c 80 110 80 110 i l = 1 ma ?40 c to 125 c 170 170 25 c 200 300 200 300 i l = 25 ma ?40 c to 125 c 550 550 ground pin v out = 25 c 600 800 600 800 i gnd a current 2.8 v, 3 v, ?40 c to 125 c 1500 1500 3.3 v i l = 100 ma 25 c 600 1000 600 1000 v out = 2.9 v, 5 v ?40 c to 125 c 1700 1700 v on/ off < 0.3 v (off) 25 c 0.01 0.8 0.01 0.8 ?40 c to 105 c 0.05 2 0.05 2 v on/ off < 0.15 v (off) ?40 c to 125 c 5 5 25 c 1.4 1.4 high = o/p on ?40 c to 125 c 1.6 1.6 on/ off input v on/off v voltage (2) 25 c 0.5 0.5 low = o/p off ?40 c to 125 c 0.15 0.15 25 c 0.01 0.01 v on/ off = 0 ?40 c to 125 c ?1 ?1 on/ off input i on/off a current 25 c 5 5 v on/ off = 5 v ?40 c to 125 c 15 15 peak output i out(pk) v out 3 v out(nom) ? 5% 25 c 150 400 400 ma current output noise bw = 300 hz to 50 khz, v n 25 c 160 160 v voltage (rms) c out = 10 f v out / v in ripple rejection f = 1 khz, c out = 10 f 25 c 63 63 db short-circuit i out(max) r l = 0 (steady state) 25 c 150 150 ma current (1) dropout voltage is defined as the input-to-output differential at which the output voltage drops 100 mv below the value measured with a 1-v differential. this dropout specification does not apply to the 1.8-v option, as the minimum v in = 2.2 v must be observed for proper biasing of ldo control circuitry. (2) the on/ off input must be actively terminated. connect to v in if this function is not used (see application information). 5 submit documentation feedback www.ti.com
application information capacitors input capacitor (c in ) output capacitor (c out ) lp2981 100-ma ultra-low dropout regulator with shutdown slvs521d ? july 2004 ? revised july 2007 a minimum value of 1 f (over the entire operating temperature range) is required at the input of the lp2981. in addition, this input capacitor should be located within 1 cm of the input pin and connected to a clean analog ground. there is no equivalent series resistance (esr) requirement for this capacitor, and the capacitance can be increased without limit. a good quality ceramic or tantalum capacitor can be used. as a pnp regulator, the lp2981 requires the output capacitor to meet both a minimum capacitance and esr value. required esr values as a function of load current are provided for various output voltages, load currents, and capacitances (see figure 2 through figure 5 ). minimum c out : 3.3 f (can be increased without limit to improve transient response stability margin) esr range: see figure 2 through figure 5 it is critical that both the minimum capacitance and esr requirement be met over the entire operating temperature range. depending on the type of capacitor used, both of these parameters can vary significantly with temperature (see capacitor characteristics section). figure 2. 5-v/3.3- f esr curves figure 3. 5-v/10- f esr curves figure 4. 3-v/3.3- f esr curves figure 5. 3-v/10- f esr curves 6 submit documentation feedback www.ti.com esr ? w load current ? ma esr ? w load current ? ma esr ? w load current ? ma esr ? w load current ? ma
capacitor characteristics ceramics tantalum aluminum on/ off operation lp2981 100-ma ultra-low dropout regulator with shutdown slvs521d ? july 2004 ? revised july 2007 application information (continued) due to their very low esr values, ceramic capacitors are not suitable for use as the output capacitor. for instance, a typical 2.2- f ceramic capacitor has an esr in the range of 10 m w to 20 m w and, thus, easily can fall out of minimum esr requirements under certain operating conditions. if a ceramic capacitor is used at the output, a 1- w resistor should be placed in series with the capacitor to raise the esr seen by the regulator. solid tantalum capacitors are optimal choices for the lp2981, but they still must meet the minimum esr requirement. note that the esr of a tantalum capacitor increases as temperature drops, as much as doubling from 25 c to ?40 c. thus, esr margins must be maintained over the temperature range to prevent regulator instability. for operation at very low temperatures, paralleling a tantalum capacitor with a ceramic one keeps the combined esr from increasing near the upper limit of the esr curve. aluminum capacitors can be used, but use with the lp2981 is impractical due to their large physical dimensions. they also must meet the esr requirements over the full temperature range. in this regard, aluminium capacitors are at a big disadvantage due to their sharp esr increase as temperature drops. for example, over a temperature drop from 20 c to ?40 c, the esr of an aluminum electrolytic capacitor can increase by a factor of 50. in addition, some of the electrolytes used in these capacitors can freeze at ?25 c, making the capacitor nonoperational. the lp2981 allows for a shutdown mode via the on/ off pin. if the shutdown feature is not used, on/ off should be connected to the input to ensure that the regulator is on at all times. to drive on/ off: a low ( 0.3 v) turns the regulator off; a high ( 3 1.6 v) turns it on. use either a totem-pole output or an open-collector output with a pullup resistor tied to v in (or another logic supply). the high signal can exceed v in , but must not exceed the absolute maximum ratings of 20 v for the on/ off pin. apply a signal with a slew rate of 3 40 mv/ s. a slow slew rate can cause the shutdown function to operate incorrectly. 7 submit documentation feedback www.ti.com
reverse input-output voltage lp2981 100-ma ultra-low dropout regulator with shutdown slvs521d ? july 2004 ? revised july 2007 application information (continued) an inherent diode is present across the pnp pass element of the lp2981. with the anode connected to the output, this diode is reverse biased during normal operation, since the input voltage is higher than the output. however, if the output is pulled one v be higher than the input, or if the input is abruptly stepped below the output, this diode is forward biased and can cause a parasitic silicon-controlled rectifier (scr) to latch, resulting in current flowing from the output to the input (values in excess of 100 ma can cause damage). thus, to prevent possible damage to the regulator in any application where the output may be pulled above the input, an external schottky diode must be connected between the output and input. with the anode on output, this schottky limits the reverse voltage across the output and input pins to ~ 0.3 v, preventing the regulator's internal diode from forward biasing. 8 submit documentation feedback www.ti.com v out v in schottky lp2981 v out v in
packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish msl peak temp (3) lp2981-28dbvr active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981-28dbvre4 active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981-28dbvt active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981-28dbvte4 active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981-30dbvr active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981-30dbvre4 active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981-30dbvt active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981-30dbvte4 active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981-33dbvr active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981-33dbvre4 active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981-33dbvt active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981-33dbvte4 active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-28dbvr active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-28dbvre4 active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-28dbvt active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-28dbvte4 active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-30dbvr active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-30dbvre4 active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-30dbvt active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-30dbvte4 active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-33dbvr active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-33dbvre4 active sot-23 dbv 5 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-33dbvt active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim lp2981a-33dbvte4 active sot-23 dbv 5 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim (1) the marketing status values are defined as follows: package option addendum www.ti.com 20-aug-2007 addendum-page 1
active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) eco plan - the planned eco-friendly classification: pb-free (rohs), pb-free (rohs exempt), or green (rohs & no sb/br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. tbd: the pb-free/green conversion plan has not been defined. pb-free (rohs): ti's terms "lead-free" or "pb-free" mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, ti pb-free products are suitable for use in specified lead-free processes. pb-free (rohs exempt): this component has a rohs exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. the component is otherwise considered pb-free (rohs compatible) as defined above. green (rohs & no sb/br): ti defines "green" to mean pb-free (rohs compatible), and free of bromine (br) and antimony (sb) based flame retardants (br or sb do not exceed 0.1% by weight in homogeneous material) (3) msl, peak temp. -- the moisture sensitivity level rating according to the jedec industry standard classifications, and peak solder temperature. important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis. package option addendum www.ti.com 20-aug-2007 addendum-page 2
tape and reel information package materials information www.ti.com 18-aug-2007 pack materials-page 1
device package pins site reel diameter (mm) reel width (mm) a0 (mm) b0 (mm) k0 (mm) p1 (mm) w (mm) pin1 quadrant lp2981-28dbvr dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 lp2981-28dbvt dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 lp2981-30dbvr dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 lp2981-30dbvt dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 lp2981-33dbvr dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 lp2981-33dbvt dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 lp2981a-28dbvr dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 lp2981a-28dbvt dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 lp2981a-30dbvr dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 lp2981a-30dbvt dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 lp2981a-33dbvr dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 lp2981a-33dbvt dbv 5 len 180 9 3.15 3.2 1.4 4 8 q3 tape and reel box information device package pins site length (mm) width (mm) height (mm) lp2981-28dbvr dbv 5 len 182.0 182.0 20.0 lp2981-28dbvt dbv 5 len 182.0 182.0 20.0 lp2981-30dbvr dbv 5 len 182.0 182.0 20.0 lp2981-30dbvt dbv 5 len 182.0 182.0 20.0 lp2981-33dbvr dbv 5 len 182.0 182.0 20.0 lp2981-33dbvt dbv 5 len 182.0 182.0 20.0 lp2981a-28dbvr dbv 5 len 182.0 182.0 20.0 lp2981a-28dbvt dbv 5 len 182.0 182.0 20.0 lp2981a-30dbvr dbv 5 len 182.0 182.0 20.0 package materials information www.ti.com 18-aug-2007 pack materials-page 2
device package pins site length (mm) width (mm) height (mm) lp2981a-30dbvt dbv 5 len 182.0 182.0 20.0 lp2981a-33dbvr dbv 5 len 182.0 182.0 20.0 lp2981a-33dbvt dbv 5 len 182.0 182.0 20.0 package materials information www.ti.com 18-aug-2007 pack materials-page 3

important notice texas instruments incorporated and its subsidiaries (ti) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. all products are sold subject to ti?s terms and conditions of sale supplied at the time of order acknowledgment. ti warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with ti?s standard warranty. testing and other quality control techniques are used to the extent ti deems necessary to support this warranty. except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. ti assumes no liability for applications assistance or customer product design. customers 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with all legal and regulatory requirements in connection with such use. ti products are neither designed nor intended for use in automotive applications or environments unless the specific ti products are designated by ti as compliant with iso/ts 16949 requirements. buyers acknowledge and agree that, if they use any non-designated products in automotive applications, ti will not be responsible for any failure to meet such requirements. following are urls where you can obtain information on other texas instruments products and application solutions: products applications amplifiers amplifier.ti.com audio www.ti.com/audio data converters dataconverter.ti.com automotive www.ti.com/automotive dsp dsp.ti.com broadband www.ti.com/broadband interface interface.ti.com digital control www.ti.com/digitalcontrol logic logic.ti.com military www.ti.com/military power mgmt power.ti.com optical networking www.ti.com/opticalnetwork microcontrollers microcontroller.ti.com security www.ti.com/security 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