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lp4950c-5v , lp4951c www.ti.com snvs208c ? september 2002 ? revised april 2013 lp4950c-5v and lp4951c adjustable micropower voltage regulators check for samples: lp4950c-5v , lp4951c 1 features description the lp4950c and lp4951c are micropower voltage 2 ? high accuracy 5v specified 100ma output regulators with very low quiescent current (75 a typ.) ? extremely low quiescent current and very low dropout voltage (typ. 40mv at light loads ? low dropout voltage and 380mv at 100ma). they are ideally suited for use in battery-powered systems. furthermore, the ? extremely tight load and line regulation quiescent current of the lp4950c/lp4951c ? very low temperature coefficient increases only slightly in dropout, prolonging battery ? use as regulator or reference life. ? needs only 1 f for stability the lp4950c in the popular 3-pin to-92 package is ? current and thermal limiting pin compatible with older 5v regulators. the 8-lead . lp4951c is available in a plastic surface mount package and offers additional system functions. lp4951c versions only one such feature is an error flag output which warns of a low output voltage, often due to falling batteries ? error flag warns of output dropout on the input. it may be used for a power-on reset. a ? logic-controlled electronic shutdown second feature is the logic-compatible shutdown input ? output pogrammable from 1.24 to 29v which enables the regulator to be switched on and off. also, the part may be pin-strapped for a 5v output or programmed from 1.24v to 29v with an external pair of resistors. careful design of the lp4950c/lp4951c has minimized all contributions to the error budget. this includes a tight initial tolerance (.5% typ.), extremely good load and line regulation (.05% typ.) and a very low output voltage temperature coefficient, making the part useful as a low-power voltage reference. block diagram and typical applications lp4950c lp4951c figure 1. figure 2. 1 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. 2 all trademarks are the property of their respective owners. production data information is current as of publication date. copyright ? 2002 ? 2013, 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.
lp4950c-5v , lp4951c snvs208c ? september 2002 ? revised april 2013 www.ti.com these devices have limited built-in esd protection. the leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the mos gates. absolute maximum ratings (1) input supply voltage ? 0.3 to +30v shutdown input voltage, ? 0.3 to +30v error comparator output voltage, (2) feedback input voltage (2) (3) ? 1.5 to +30v power dissipation internally limited junction temperature (t j ) +150 c ambient storage temperature ? 65 to +150 c esd rating human body model (4) 2 kv for soldering specifications, see the following document: www.ti.com/lit/snoa549 (1) absolute maximum ratings are limits beyond which damage to the device may occur. operating ratings are conditions under which operation of the device is specified. operating ratings do not imply specified performance limits. for specified performance limits and associated test conditions, see the electrical characteristics tables. (2) may exceed input supply voltage. (3) when used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped to ground. (4) human body model 1.5 k ? in series with 100 pf. lp4950 - passes 2 kv hbm. lp4951 - all pins pass 2 kv except vfb -1000v. operating ratings (1) maximum input supply voltage 30v junction temperature range (2) lp4950c, lp4951c ? 40 c to 125 c (1) absolute maximum ratings are limits beyond which damage to the device may occur. operating ratings are conditions under which operation of the device is specified. operating ratings do not imply specified performance limits. for specified performance limits and associated test conditions, see the electrical characteristics tables. (2) the junction-to-ambient thermal resistances are as follows: 180 c/w and 160 c/w for the to-92 package with 0.40 inch and 0.25 inch leads to the printed circuit board (pcb) respectively, 160 c/w for the molded plastic soic (d). the above thermal resistances for the soic package apply when the package is soldered directly to the pcb. 2 submit documentation feedback copyright ? 2002 ? 2013, texas instruments incorporated product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c www.ti.com snvs208c ? september 2002 ? revised april 2013 electrical characteristics (1) lp4950cz lp4951cm conditions parameter units (1) tested design typ limit (2) limit (3) output voltage t j = 25 c 5.0 5.1 v max 4.9 v min ? 25 c t j 85 c 5.15 v max 4.85 v min full operating temperature range 5.2 v max 4.8 v min output voltage 100 a i l 100 ma 5.24 v max t j t jmax 4.76 v min output voltage temperature (4) 150 ppm/ c coefficient line regulation (5) 6v v in 30v (6) 0.04 0.2 % max 0.4 % max load regulation (5) 100 a i l 100ma 0.1 0.2 % max 0.3 % max dropout voltage (7) i l = 100 a 50 80 mv max 150 mv max i l = 100ma 380 450 mv max 600 mv max ground current i l = 100 a 75 150 a max 170 a max i l = 100ma 8 15 ma max 19 ma max dropout ground current v in = 4.5v 110 200 a max i l = 100 a 230 a max current limit v out = 0 160 200 ma max 220 ma max thermal regulation (8) 0.05 0.2 %/w max output noise, 10 hz to 100 khz c l = 1 f 430 v rms c l = 200 f 160 v rms c l = 3.3 f (bypass = 0.01 f pins 7 100 v rms to 1 (lp4951c) (1) unless otherwise noted all limits specified for v in = 6v, i l = 100 a and c l = 1 f. limits appearing in boldface type apply over the entire junction temperature range for operation. limits appearing in normal type apply for t a = t j = 25 c. additional conditions for the 8- pin versions are feedback tied to v tap , output tied to sense (v out = 5v), and v shutdown 0.8v. (2) specified and 100% production tested. (3) specified but not 100% production tested. these limits are not used to calculate outgoing aql levels. (4) output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. (5) regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. changes in output voltage due to heating effects are covered under the specification for thermal regulation. (6) line regulation for the lp4951c is tested at 150 c for i l = 1 ma. for i l = 100 a and t j = 125 c, line regulation is specified by design to 0.2%. see typical performance characteristics for line regulation versus temperature and load current. (7) dropout voltage is defined as the input to output differential at which the output voltage drops 100 mv below its nominal value measured at 1v differential. at very low values of programmed output voltage, the minimum input supply voltage of 2v (2.3v over temperature) must be taken into account. (8) thermal regulation is defined as the change in output voltage at a time t after a change in power dissipation is applied, excluding load or line regulation effects. specifications are for a 50 ma load pulse at v in = 30v (1.25w pulse) for t = 10ms. copyright ? 2002 ? 2013, texas instruments incorporated submit documentation feedback 3 product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c snvs208c ? september 2002 ? revised april 2013 www.ti.com electrical characteristics lp4951c parameter conditions (1) typ tested limit design limit units (2) (3) 8-pin versions only reference voltage 1.235 1.285 v max 1.295 v max 1.185 v min 1.165 vmin reference voltage (4) 1.335 v max 1.135 v min feedback pin bias current 20 40 na max 60 na max reference voltage (5) 50 ppm/ c temperature coefficient feedback pin bias current 0.1 na/ c temperature coefficient error comparator output leakage current v oh = 30v 0.01 1 a max 2 a max output low voltage v in = 4.5v 150 250 mv max i ol = 400 a 400 mv max upper threshold voltage (3) 60 40 mv min 25 mv min lower threshold voltage (6) 75 95 mv max 140 mv max hysteresis (6) 15 mv shutdown input input logic voltage 1.3 v low (regulator on) 0.7 v max high (regulator off) 2.0 v min shutdown pin input current v shutdown = 2.4v 30 50 a max 100 a max v shutdown = 30v 450 600 a max 750 a max regulator output current in (7) 3 10 a max shutdown 20 a max (1) unless otherwise noted all limits specified for v in = 6v, i l = 100 a and c l = 1 f. limits appearing in boldface type apply over the entire junction temperature range for operation. limits appearing in normal type apply for t a = t j = 25 c. additional conditions for the 8- pin versions are feedback tied to v tap , output tied to sense (v out = 5v), and v shutdown 0.8v. (2) specified and 100% production tested. (3) specified but not 100% production tested. these limits are not used to calculate outgoing aql levels. (4) v ref v out (v in ? 1v), 2.3v v in 30v, 100 a i l 100ma, t j t jmax . (5) output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. (6) comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at v in = 6v. to express these thresholds in terms of output voltage change, multiply by the error amplifier gain = v out /v ref = (r1 + r2)/r2.for example, at a programmed output voltage of 5v, the error output is specified to go low when the output drops by 95 mv 5v/1.235v = 384 mv. thresholds remain constant as a percent of v out as v out is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% specified. (7) v shutdown 2v, v in 30v, v out = 0, feedback pin tied to v tap . 4 submit documentation feedback copyright ? 2002 ? 2013, texas instruments incorporated product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c www.ti.com snvs208c ? september 2002 ? revised april 2013 connection diagrams to-92 plastic package surface-mount package (soic) figure 3. bottom view figure 4. top view copyright ? 2002 ? 2013, texas instruments incorporated submit documentation feedback 5 product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c snvs208c ? september 2002 ? revised april 2013 www.ti.com typical performance characteristics . quiescent current dropout characteristics figure 5. figure 6. input current input current figure 7. figure 8. output voltage vs. temperature of 3 representative units quiescent current figure 9. figure 10. 6 submit documentation feedback copyright ? 2002 ? 2013, texas instruments incorporated product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c www.ti.com snvs208c ? september 2002 ? revised april 2013 typical performance characteristics (continued) . quiescent current quiescent current figure 11. figure 12. quiescent current short circuit current figure 13. figure 14. dropout voltage dropout voltage figure 15. figure 16. copyright ? 2002 ? 2013, texas instruments incorporated submit documentation feedback 7 product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c snvs208c ? september 2002 ? revised april 2013 www.ti.com typical performance characteristics (continued) . lp4951c minimum operating voltage lp4951c feedback bias current figure 17. figure 18. lp4951c feedback pin current lp4951c error comparator output figure 19. figure 20. lp4951c comparator sink current line transient response figure 21. figure 22. 8 submit documentation feedback copyright ? 2002 ? 2013, texas instruments incorporated product folder links: lp4950c-5v lp4951c 0 1 2 3 4 5 -2 0 2 4 6 8 comparator output (v) input voltage (v) v out = 5v hysteresis note: pullup resistor to separate 5v supply
lp4950c-5v , lp4951c www.ti.com snvs208c ? september 2002 ? revised april 2013 typical performance characteristics (continued) . load transient response load transient response figure 23. figure 24. lp4951c enable transient output impedance figure 25. figure 26. ripple rejection ripple rejection figure 27. figure 28. copyright ? 2002 ? 2013, texas instruments incorporated submit documentation feedback 9 product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c snvs208c ? september 2002 ? revised april 2013 www.ti.com typical performance characteristics (continued) . ripple rejection output noise figure 29. figure 30. lp4951c divider resistance shutdown threshold voltage figure 31. figure 32. line regulation lp4951c maximum rated output current figure 33. figure 34. 10 submit documentation feedback copyright ? 2002 ? 2013, texas instruments incorporated product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c www.ti.com snvs208c ? september 2002 ? revised april 2013 typical performance characteristics (continued) . thermal response figure 35. application hints external capacitors a 1.0 f (or greater) capacitor is required between the output and ground for stability at output voltages of 5v or more. at lower output voltages, more capacitance is required. without this capacitor the part will oscillate. most types of tantalum or aluminum electrolytics work fine here; even film types work but are not recommended for reasons of cost. many aluminum electrolytics have electrolytes that freeze at about ? 30 c, so solid tantalums are recommended for operation below ? 25 c. the important parameters of the capacitor are an esr of about 5 or less and a resonant frequency above 500 khz. the value of this capacitor may be increased without limit. at lower values of output current, less output capacitance is required for stability. the capacitor can be reduced to 0.33 f for currents below 10 ma or 0.1 f for currents below 1 ma. using the 8-pin version at voltages below 5v runs the error amplifier at lower gains so that more output capacitance is needed. for the worst-case situation of a 100 ma load at 1.23v output (output shorted to feedback) a 3.3 f (or greater) capacitor should be used. unlike many other regulators, the lp4950c will remain stable and in regulation with no load in addition to the internal voltage divider. this is especially important in cmos ram keep-alive applications. when setting the output voltage of the lp4951c version with external resistors, a minimum load of 1 a is recommended. a 0.1 f capacitor should be placed from the lp4950c/lp4951c input to ground if there is more than 10 inches of wire between the input and the ac filter capacitor or if a battery is used as the input. stray capacitance to the lp4951c feedback terminal (pin 7) can cause instability. this may especially be a problem when using high value external resistors to set the output voltage. adding a 100pf capacitor between output and feedback and increasing the output capacitor to at least 3.3 f will fix this problem. error detection comparator output the comparator produces a logic low output whenever the lp4951c output falls out of regulation by more than approximately 5%. this figure is the comparator's built-in offset of about 60 mv divided by the 1.235 reference voltage. (see to the block diagram in the front of the datasheet.) this trip level remains ? 5% below normal ? regardless of the programmed output voltage of the 4951c. for example, the error flag trip level is typically 4.75v for a 5v output or 11.4v for a 12v output. the out of regulation condition may be due either to low input voltage, current limiting, or thermal limiting. figure 36 below gives a timing diagram depicting the error signal and the regulated output voltage as the lp4951c input is ramped up and down. the error signal becomes valid (low) at about 1.3v input. it goes high at about 5v input (the input voltage at which v out = 4.75v). since the lp4951c's dropout voltage is load- dependent (see curve in typical performance characteristics), the input voltage trip point (about 5v) will vary with the load current. the output voltage trip point (approx. 4.75v) does not vary with load. copyright ? 2002 ? 2013, texas instruments incorporated submit documentation feedback 11 product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c snvs208c ? september 2002 ? revised april 2013 www.ti.com the error comparator has an open-collector output which requires an external pullup resistor. this resistor may be returned to the output or some other supply voltage depending on system requirements. in determining a value for this resistor, note that while the output is rated to sink 400 a, this sink current adds to battery drain in a low battery condition. suggested values range from 100k to 1 m . the resistor is not required if this output is unused. *when v in 1.3v, the error flag pin becomes a high impedance, and the error flag voltage rises to its pull-up voltage. using v out as the pull-up voltage (see figure 37 ), rather than an external 5v source, will keep the error flag voltage under 1.2v (typ.) in this condition. the user may wish to divide down the error flag voltage using equal-value resistors (10 k ? suggested), to ensure a low-level logic signal during any fault condition, while still allowing a valid high logic level during normal operation. figure 36. error output timing programming the output voltage (lp4951c) the lp4951c may be pin-strapped for 5v using its internal voltage divider by tying the pin 1 (output) to pin 2 (sense) pins together, and also tying the pin 7 (feedback) and pin 6 (v tap ) pins together. alternatively, it may be programmed for any output voltage between its 1.235v reference and its 30v maximum rating. as seen in figure 37 , an external pair of resistors is required. the complete equation for the output voltage is (1) where v ref is the nominal 1.235 reference voltage and i fb is the feedback pin bias current, nominally ? 20 na. the minimum recommended load current of 1 a forces an upper limit of 1.2 m on the value of r 2 , if the regulator must work with no load (a condition often found in cmos in standby). i fb will produce a 2% typical error in v out which may be eliminated at room temperature by trimming r 1 . for better accuracy, choosing r 2 = 100k reduces this error to 0.17% while increasing the resistor program current to 12 a. since the lp4951c typically draws 60 a at no load with pin 2 open-circuited, this is a small price to pay. 12 submit documentation feedback copyright ? 2002 ? 2013, texas instruments incorporated product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c www.ti.com snvs208c ? september 2002 ? revised april 2013 *see application hints . . **drive with ttl-high to shut down. ground or leave open if shutdown feature is not to be used. . note: pins 2 and 6 are left open. figure 37. adjustable regulator (lp4951c) reducing output noise in reference applications it may be advantageous to reduce the ac noise present at the output. one method is to reduce the regulator bandwidth by increasing the size of the output capacitor. this is the only way noise can be reduced on the 3 lead lp4950c but is relatively inefficient, as increasing the capacitor from 1 f to 220 f only decreases the noise from 430 v to 160 v rms for a 100khz bandwidth at 5v output. noise can be reduced fourfold by a bypass capacitor across r 1 , since it reduces the high frequency gain from 4 to unity. pick (2) or about 0.01 f. when doing this, the output capacitor must be increased to 3.3 f to maintain stability. these changes reduce the output noise from 430 v to 100 v rms for a 100khz bandwidth at 5v output. with the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages. copyright ? 2002 ? 2013, texas instruments incorporated submit documentation feedback 13 product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c snvs208c ? september 2002 ? revised april 2013 www.ti.com schematic diagram 14 submit documentation feedback copyright ? 2002 ? 2013, texas instruments incorporated product folder links: lp4950c-5v lp4951c
lp4950c-5v , lp4951c www.ti.com snvs208c ? september 2002 ? revised april 2013 revision history changes from revision b (april 2013) to revision c page ? changed layout of national data sheet to ti format .......................................................................................................... 14 copyright ? 2002 ? 2013, texas instruments incorporated submit documentation feedback 15 product folder links: lp4950c-5v lp4951c
package option addendum www.ti.com 11-dec-2014 addendum-page 1 packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish (6) msl peak temp (3) op temp (c) device marking (4/5) samples lp4951cm/nopb active soic d 8 95 green (rohs & no sb/br) cu sn level-1-260c-unlim -40 to 125 lp495 1cm lp4951cmx/nopb active soic d 8 2500 green (rohs & no sb/br) cu sn level-1-260c-unlim -40 to 125 lp495 1cm (1) the marketing status values are defined as follows: 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. (4) there may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) multiple device markings will be inside parentheses. only one device marking contained in parentheses and separated by a "~" will appear on a device. if a line is indented then it is a continuation of the previous line and the two combined represent the entire device marking for that device. (6) lead/ball finish - orderable devices may have multiple material finish options. finish options are separated by a vertical ruled line. lead/ball finish values may wrap to two lines if the finish value exceeds the maximum column width. 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.
package option addendum www.ti.com 11-dec-2014 addendum-page 2 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.
tape and reel information *all dimensions are nominal device package type package drawing pins spq reel diameter (mm) reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p1 (mm) w (mm) pin1 quadrant lp4951cmx/nopb soic d 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 q1 package materials information www.ti.com 5-dec-2014 pack materials-page 1
*all dimensions are nominal device package type package drawing pins spq length (mm) width (mm) height (mm) lp4951cmx/nopb soic d 8 2500 367.0 367.0 35.0 package materials information www.ti.com 5-dec-2014 pack materials-page 2

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