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1 lt1585a/lt1585a-3.3 1585afa 5a low dropout fast response positive regulators adjustable and fixed the lt 1585a/lt1585a-3.3 are low dropout 3-terminal regulators with 5a output current capability. design has been optimized for low voltage applications where tran- sient response and minimum input voltage are critical. similar to the lt1084 family, these regulators feature lower dropout voltage and faster transient response. these improvements make them ideal for low voltage microprocessor applications requiring a regulated 2.5v to 3.6v output with an input supply below 7v. current limit is trimmed to ensure specified output current and controlled short-circuit current. on-chip thermal lim- iting provides protection against any combination of over- load that would create excessive junction temperatures. the lt1585a/lt1585a-3.3 are available in the industry standard 3-pin to-220 power package. fast transient response guaranteed dropout voltage at multiple currents load regulation: 0.05% typ trimmed current limit on-chip thermal limiting standard 3-pin to-220 power package pentium processor supplies powerpc tm supplies other 2.5v to 3.6v microprocessor supplies low voltage logic supplies battery-powered circuitry post regulator for switching supply lt1585act adjustable lt1585act-3.3 3.3v fixed , ltc and lt are registered trademarks of linear technology corporation. pentium is a registered trademark of intel corporation. powerpc is a trademark of ibm corporation. note: microprocessor applications with load transients of 3.8a require output decoupling capacitance >1300 f on fixed voltage parts to achieve < 50mv of deviation from nominal output. consult factory for details dropout voltage vs output current 3.3v, 5a regulator lt1585a-3.3 v in 4.75v 1585a ta01 c1 10 f * required for stability 3.3v 5a c2* 100 f + + output current (a) 0 input/output differential (v) 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 lt1585a ta02 i full load descriptio u features applicatio s u typical applicatio u
2 lt1585a/lt1585a-3.3 1585afa absolute m axi m u m ratings w ww u v in ............................................................................. 7v operating junction temperature range control section ................................... 0 c to 125 c power transistor ................................. 0 c to 150 c storage temperature range ................. 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c 100% thermal limit functional test preco n ditio n i g u u u package/order i n for m atio n w u u order part number lt1585act order part number lt1585act-3.3 ja = 50 c/w, jc = 3 c/w ja = 50 c/w, jc = 3 c/w tab is v out t package 3-lead plastic to-220 v in v out adj front view 3 2 1 tab is v out t package 3-lead plastic to-220 v in v out gnd front view 3 2 1 consult ltc marketing for parts specified with wider operating temperature ranges. parameter conditions min typ max units reference voltage lt1585a (v in ?v out ) = 3v, t j = 25 c, i out = 10ma 1.238 (1%) 1.250 1.262 (+1%) v 1.5v (v in ?v out ) 5.75v, 10ma i out 5a 1.225 (?%) 1.250 1.275 (+2%) v output voltage lt1585a-3.3 v in = 5v, t j = 25 c, i out = 0ma 3.267 (1%) 3.300 3.333 (+1%) v 4.75v v in 7v, 0ma i out 5a 3.235 ( 2%) 3.300 3.365 (+ 2%) v line regulation lt1585a 2.75v v in 7v, i out = 10ma (notes 1, 2) lt1585a-3.3 4.75v v in 7v, i out = 0ma 0.005 0.2 % load regulation lt1585a (v n ?v out ) = 3v, t j = 25 c, 10ma i out i full load (notes 1, 2, 3) lt1585a-3.3 v in = 5v, t j = 25 c, 0ma i out i full load 0.05 0.3 % 0.05 0.5 % dropout voltage lt1585a ? v ref = 1%, i out = 3a lt1585a-3.3 ? v out = 1%, i out = 3a 1.150 1.300 v lt1585a ? v ref = 1%, i out = 5a lt1585a-3.3 ? v out = 1%, i out = 5a 1.200 1.400 v current limit lt1585a (v in ?v out ) = 5.5v (note 3) lt1585a-3.3 (v in ?v out ) = 5.5v 5.0 6.0 a adjust pin current lt1585a 55 120 a adjust pin current lt1585a 1.5v (v in ?v out ) 5.75v, 10ma i out i full load 0.2 5 a change (note 3) minimum lt1585a 1.5v (v in ?v out ) 5.75v 210 ma load current quiescent current lt1585a-3.3 v in = 5v 813 ma electrical characteristics the denotes specificatons which apply over the specified temperature range, otherwise specifications are at t a = 25 c.
3 lt1585a/lt1585a-3.3 1585afa parameter conditions min typ max units ripple rejection lt1585a f = 120hz, c out = 100 f tant., (v in ?v out ) = 3v, i out = 5a lt1585a-3.3 f = 120hz, c out = 100 f tant., v in = 6.3v, i out = 5a 60 72 db thermal lt1585a t a = 25 c, 30ms pulse regulation lt1585a-3.3 t a = 25 c, 30ms pulse 0.004 0.02 %/w temperature stability 0.5 % long-term stability t a = 125 c, 1000 hrs. 0.03 1.0 % rms output noise t a = 25 c, 10hz f 10khz 0.003 % (% of v out ) thermal resistance lt1585a t package: control circuitry/power transistor 0.7/3.0 c/w junction to case note 1: see thermal regulation specifications for changes in output voltage due to heating effects. load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. note 2: line and load regulation are guaranteed up to the maximum power dissipation 28.8w for the lt1585a in t package. power dissipation is determined by input/output differential and the output current. guaranteed maximum output power will not be available over the full input/output voltage range. note 3: i full load is defined as the maximum value of output load current as a function of input-to-output voltage. i full load is equal to 5a for the lt1585a/lt1585a-3.3. the lt1585a has constant current limit with changes in input-to-output voltage. typical perfor m a n ce characteristics u w temperature ( c) 0.20 output voltage deviation (%) 0.10 0 0.10 0.15 0.05 0.05 25 25 75 125 lt1585a ?tpc03 175 ?0 ?5 0 50 100 150 ? i = 5a lt1585a load regulation vs temperature output current (a) 0 dropout voltage (v) 1.1 1.3 1.5 4 lt1585a ?tpc01 0.9 0.7 1.0 1.2 1.4 0.8 0.6 0.5 1 2 3 5 t = 5 c t = 125 c t = 25 c guaranteed test points lt1585a dropout voltage vs output current temperature ( c) ?5 short-circuit current (a) 5.0 5.5 125 lt1585a ?tpc02 4.5 4.0 ?5 25 50 175 6.0 75 ?0 0 150 100 lt1585a short-circuit current vs temperature electrical characteristics the denotes specificatons which apply over the specified temperature range, otherwise specifications are at t a = 25 c.
4 lt1585a/lt1585a-3.3 1585afa typical perfor m a n ce characteristics u w lt1585a-3.3 quiescent current vs temperature temperature ( c) ?5 quiescent current (ma) 9 11 13 125 lt1585a ?tpc09 7 5 8 10 12 6 4 3 ?5 25 75 50 150 0 50 100 175 lt1585a-3.3 ripple rejection vs frequency frequency (hz) 20 ripple rejection (db) 40 50 70 90 10 1k 10k 100k lt1585a ?tpc10 0 100 60 30 10 80 lt1585a-3.3: (v in ?v out ) 3v 0.5v v ripple 2v i out = i full load lt1585a maximum power dissipation* case temperature (?c) 50 power (w) 20 25 30 80 100 lt1585a ? tpc11 15 10 60 70 90 110 120 130 140 150 5 0 temperature ( c) ?5 reference voltage (v) 1.255 1.265 1.275 125 lt1585a ?tpc04 1.245 1.235 1.250 1.260 1.270 1.240 1.230 1.225 ?5 25 75 ?0 150 0 50 100 175 lt1585a reference voltage vs temperature lt1585a-3.3 output voltage vs temperature temperature ( c) ?5 output voltage (v) 3.33 3.34 3.35 125 lt1585a ?tpc06 3.32 3.31 3.30 3.29 3.28 3.27 3.26 3.25 ?5 25 75 50 150 0 50 100 175 v out = 3.3v output voltage vs temperature using adjustable lt1585a temperature ( c) ?5 output voltage (v) 3.60 3.65 3.70 125 lt1585a ?tpc05 3.55 3.50 3.45 3.40 3.35 3.30 3.25 3.20 ?5 25 75 50 150 0 50 100 175 v out = 3.6v v out = 3.45v v out = 3.38v v out = 3.3v v out set with 1% resistors lt1585a adjust pin current vs temperature temperature ( c) ?5 adjust pin current ( a) 60 80 100 125 lt1585a ?tpc08 40 20 50 70 90 30 10 0 ?5 25 75 50 150 0 50 100 175 lt1585a minimum load current vs temperature temperature ( c) ?5 minimum load current (ma) 3 4 5 125 lt1585a ?tpc07 2 1 0 ?5 25 75 50 150 0 50 100 175 *as limited by maximum junction temperature
5 lt1585a/lt1585a-3.3 1585afa si plified sche atic ww thermal limit gnd for fixed voltage device v in v out lt1585a ?bd adj + applicatio n s i n for m atio n wu u u general the lt1585a/lt1585a-3.3 3-terminal regulators are easy to use and have all the protection features expected in high performance linear regulators. the devices are short-circuit protected, safe-area protected and provide thermal shutdown to turn off the regulators should the junction temperature exceed about 150 c. the regulators include an adjustable and a fixed 3.3v version. these ics are pin compatible with the lt1083/lt1084/ lt1085 family of linear regulators but offer lower dropout voltage and faster transient response. the trade-off for this improved performance is a 7v maximum supply voltage. similar to the lt1083/lt1084/lt1085 family, the lt1585a/lt1585a-3.3 regulators require an output ca- pacitor for stability. however, the improved frequency compensation permits the use of capacitors with much lower esr while still maintaining stability. this is critical in addressing the needs of modern, low voltage, high speed microprocessors. current generation microprocessors cycle load current from almost zero to amps in tens of nanoseconds. output voltage tolerances are tighter and include transient re- sponse as part of the specification. the lt1585a/ lt1585a-3.3 are specifically designed to meet the fast current load-step requirements of these microprocessors and save total cost by needing less output capacitance in order to maintain regulation. stability the circuit design in the lt1585a/lt1585a-3.3 requires the use of an output capacitor as part of the frequency compensation. for all operating conditions, the addition of a 100 f solid tantalum or aluminum electrolytic on the output ensures stability. normally, the lt1585a/ lt1585a-3.3 can use smaller value capacitors. many different types of capacitors are available and have widely varying characteristics. these capacitors differ in capaci-
6 lt1585a/lt1585a-3.3 1585afa applicatio n s i n for m atio n wu u u tor tolerance (sometimes ranging up to 100%), equiva- lent series resistance, equivalent series inductance and capacitance temperature coefficient. the lt1585a/ lt1585a-3.3 frequency compensation optimizes fre- quency response with low esr capacitors. in general, use capacitors with an esr of less than 1 ? . on the adjustable lt1585a, bypassing the adjust terminal improves ripple rejection and transient response. bypass- ing the adjust pin increases the required output capacitor value. the value of 100 f tantalum or aluminum covers all cases of bypassing the adjust terminal. with no adjust pin bypassing, smaller values of capacitors provide equally good results. normally, capacitor values on the order of several hun- dred microfarads are used on the output of the regulators to ensure good transient response with heavy load current changes. output capacitance can increase without limit and larger values of output capacitance further improve the stability and transient response of the lt1585a/ lt1585a-3.3. large load current changes are exactly the situation presented by modern microprocessors. the load current step contains higher order frequency components that the output decoupling network must handle until the regulator throttles to the load current level. capacitors are not ideal elements and contain parasitic resistance and inductance. these parasitic elements dominate the change in output voltage at the beginning of a transient load step change. the esr of the output capacitors produces an instantaneous step in output voltage ( ? v = ? i ?esr). the esl of the output capacitors produces a droop propor- tional to the rate of change of output current (v = l ? i/ ? t). the output capacitance produces a change in output voltage proportional to the time until the regulator can respond ( ? v = ? t ? ? i/c). these transient effects are illustrated in figure 1. the use of capacitors with low esr, low esl and good high frequency characteristics is critical in meeting the output voltage tolerances of these high speed micropro- esr effects lt1585a ?f01 esl effects capacitance effects point at which regulator takes control slope, = v t ? i c figure 1 cessors. these requirements dictate a combination of high quality, surface mount tantalum capacitors and ceramic capacitors. the location of the decoupling net- work is critical to transient response performance. place the decoupling network as close as possible to the pro- cessor pins because trace runs from the decoupling capacitors to the processor pins are inductive. the ideal location for the decoupling network is actually inside the microprocessor socket cavity. in addition, use large power and ground plane areas to minimize distribution drops. a possible stability problem that occurs in monolithic linear regulators is current limit oscillations. the lt1585a/ lt1585a-3.3 essentially have a flat current limit over the range of input supply voltage. the lower current limit rating and 7v maximum supply voltage rating for these devices permit this characteristic. current limit oscilla- tions are typically nonexistent, unless the input and out- put decoupling capacitors for the regulators are mounted several inches from the terminals. protection diodes in normal operation, the lt1585a/lt1585a-3.3 do not require any protection diodes. older 3-terminal regulators require protection diodes between the output pin and the input pin or between the adjust pin and the output pin to prevent die overstress. on the adjustable lt1585a, internal resistors limit inter- nal current paths on the adjust pin. therefore, even with bypass capacitors on the adjust pin, no protection diode is needed to ensure device safety under short-circuit conditions.
7 lt1585a/lt1585a-3.3 1585afa applicatio n s i n for m atio n wu u u a protection diode between the input and output pins is usually not needed. an internal diode between the input and output pins on the lt1585a/lt1585a-3.3 can handle microsecond surge currents of 50a to 100a. even with large value output capacitors it is difficult to obtain those values of surge currents in normal operation. only with large values of output capacitance, such as 1000 f to 5000 f, and with the input pin instantaneously shorted to ground can damage occur. a crowbar circuit at the input of the lt1585a/lt1585a-3.3 can generate those levels of current, and a diode from output to input is then recom- mended. this is shown in figure 2. usually, normal power supply cycling or system ?ot plugging and unplugging will not generate current large enough to do any damage. the adjust pin can be driven on a transient basis 7v with respect to the output, without any device degradation. as with any ic regulator, exceeding the maximum input-to- output voltage differential causes the internal transistors to break down and none of the protection circuitry is then functional. ripple rejection the typical curve for ripple rejection reflects values for the lt1585a-3.3 fixed output voltage part. in applications that require improved ripple rejection, use the adjustable device. a bypass capacitor from the adjust pin to ground reduces the output ripple by the ratio of v out /1.25v. the impedance of the adjust pin capacitor at the ripple fre- quency should be less than the value of r1 (typically in the range of 100 ? to 120 ? ) in the feedback divider network in figure 2. therefore, the value of the required adjust pin capacitor is a function of the input ripple frequency. for example, if r1 equals 100 ? and the ripple frequency equals 120hz, the adjust pin capacitor should be 22 f. at 10khz, only 0.22 f is needed. output voltage the lt1585a adjustable regulator develops a 1.25v ref- erence voltage between the output pin and the adjust pin (see figure 3). placing a resistor r1 between these two terminals causes a constant current to flow through r1 and down through r2 to set the overall output voltage. normally, this current is the specified minimum load current of 10ma. the current out of the adjust pin adds to the current from r1 and is typically 55 a. its output voltage contribution is small and only needs consider- ation when very precise output voltage setting is required. lt1585a-3.3 d1 1n4002 (optional) gnd v in v out in out c1 10 f c2 100 f lt1585a d1 1n4002 (optional) adj v in v out in out lt1585a ?f02 c1 10 f c2 100 f r1 r2 c adj + + + + + figure 2 lt1585a adj v in v out in r1 v ref r2 v out = v ref (1 + r2/r1) + i adj (r2) out i adj 55 a lt1585a ?f03 c1 10 f c2 100 f + + figure 3. basic adjustable regulator
8 lt1585a/lt1585a-3.3 1585afa applicatio n s i n for m atio n wu u u load regulation is obtained when the top of resistor divider r1 connects directly to the regulator output and not to the load. figure 5 illustrates this point. if r1 connects to the load, the effective resistance between the regulator and the load is: r p (1 + r2/r1), r p = parasitic line resistance the connection shown in figure 5 does not multiply r p by the divider ratio. as an example, r p is about four milliohms per foot with 16-gauge wire. this translates to 4mv per foot at 1a load current. at higher load currents, this drop represents a significant percentage of the overall regula- tion. it is important to keep the positive lead between the regulator and the load as short as possible and to use large wire or pc board traces. load regulation it is not possible to provide true remote load sensing because the lt1585a/lt1585a-3.3 are 3-terminal de- vices. load regulation is limited by the resistance of the wire connecting the regulators to the load. load regula- tion per the data sheet specification is measured at the bottom of the package. for fixed voltage devices, negative side sensing is a true kelvin connection with the ground pin of the device returned to the negative side of the load. this is illustrated in figure 4. for adjustable voltage devices, negative side sensing is a true kelvin connection with the bottom of the output divider returned to the negative side of the load. the best lt1585a-3.3 r p parasitic line resistance gnd v in r l in out lt1585a ?f04 figure 4. connection for best load regulation lt1585a out in v in adj r p parasitic line resistance r1* *connect r1 to case connect r2 to load lt1585a ?f05 r l r2* figure 5. connection for best load regulation
9 lt1585a/lt1585a-3.3 1585afa thermal considerations the lt1585a/lt1585a-3.3 family protects the device under overload conditions with internal power and ther- mal limiting circuitry. however, for normal continuous load conditions, do not exceed maximum junction tem- perature ratings. it is important to consider all sources of thermal resistance from junction-to-ambient. these sources include the junction-to-case resistance, the case- to-heat sink interface resistance and the heat sink resis- tance. thermal resistance specifications have been devel- oped to more accurately reflect device temperature and ensure safe operating temperatures. the electrical char- acteristics section provides a separate thermal resistance and maximum junction temperature for both the control circuitry and the power transistor. older regulators, with a single junction-to-case thermal resistance specifica- tion, use an average of the two values provided here and allow excessive junction temperatures under certain con- ditions of ambient temperature and heat sink resistance. calculate the maximum junction temperature for both sections to ensure that both thermal limits are met. junction-to-case thermal resistance is specified from the ic junction to the bottom of the case directly below the die. this is the lowest resistance path for heat flow. proper mounting ensures the best thermal flow from this area of the package to the heat sink. linear technology strongly recommends thermal compound at the case-to-heat sink interface. use a thermally conductive spacer if the case of the device must be electrically isolated and include its contribution to the total thermal resistance. please con- sult ?ounting considerations for power semiconduc- tors? 1990 linear applications handbook, volume i , pages rr3-1 to rr3-20. the output connects to the case of both the lt1585a and the lt1585a-3.3. for example, using an lt1585act-3.3 (to-220, com- mercial) and assuming: v in (max continuous) = 5.25v (5v + 5%), v out = 3.3v, i out = 5a t a = 70 c, heat sink = 3 c/w case-to-heat sink = 1 c/w (with thermal compound) power dissipation under these conditions is equal to: p d = (v in ?v out )(i out ) = (5.25 ?3.3)(5) = 9.75w junction temperature will be equal to: t j = t a + p d ( heat sink + case-to-heat sink + jc ) for the control section: t j = 70 c + 9.75w (3 c/w + 1 c/w + 0.7 c/w) = 115.8 c 115.8 c < 125 c = t jmax (control section commer- cial range) for the power transistor: t j = 70 c + 9.75w (3 c/w + 1 c/w + 3 c/w) = 138.3 c 138.3 c < 150 c = t jmax (power transistor com- mercial range) in both cases the junction temperature is below the maximum rating for the respective sections, ensuring reliable operation. applicatio n s i n for m atio n wu u u
10 lt1585a/lt1585a-3.3 1585afa typical applicatio n s n u minimum parts count lt1585a adjustable circuit for the intel 120mhz pentium processor lt1585act adj in avx corp. (803) 448-9411 thermalloy inc. (214) 243-4321 do not substitute components. c1 to c3 220 f 10v avx tps 3 each r1 110 ? 0.1% c4 330nf 16v avx x7r 0805 out 4.75v to 5.25v thermalloy 7020b-mt place in microprocessor socket cavity c5 to c10 100 f 10v avx tps 6 each c11 to c20 1 f 16v avx y5v 0805 10 each r2 197 ? 0.1% 3.50v 5a lt1585a ta04 + + lt1585a transient response for 3.8a load current step* v out 50mv/div i out 2a/div 100 s/div *transient response measured with an intel power validator. v out is measured at the power validator lt1584a ?ta05
11 lt1585a/lt1585a-3.3 1585afa information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. typical applicatio n s n u guaranteed lt1585a circuit for the intel 100mhz and higher frequency pentium processors (meets intel specifications with worst-case tolerances) + lt1585a adj in r1 1k c2 to c4 220 f 10v avx tps 3 each 5v out 3 see note 6 see note 5 see note 7 2 1 2 r2 1k r4 6 5 4 3 2 1 r3e 117 ? r3d 83 ? c6 0.01 f c1 0.1 f c5 33pf npo 1 56 8 7 3 4 r3c 800 ? r3b 1.35k r3a 1.15k lt1431s comp col sgnd fgnd v + ref r t r m pgnd sgnd lt1584 ?ta06 pgnd sense v out place in microprocessor socket cavity c14 to c23 1 f 16v avx y5v 0805 10 each c8 to c13 100 f 10v avx tps 6 each notes: unless otherwise specified 1. all resistor values are ohms, 1/8w, 5% 2. all capacitors are 50v, 20% 3. all polarized capacitors are avx type tps or equivalent 4. input capacitance may be reduced if the 5v supply is well bypassed 5. for 100mhz pentium processor, input voltage must be at least 4.85v at the regulator input 6. for pentium vre processor, r4 not installed ?for 3.3v output, install 0 ? jumper resistor r4 7. r3a to r3e are b.i. technology 627v100 + c7 100 f 10v thermalloy 7021b-mt + + lt1585a/lt1431 transient response for 3.8a load current step* v out 50mv/div i out 2a/div 100 s/div lt1584a ?ta06 *transient response measured with an intel power validator. v out is measured at the power validator
12 lt1585a/lt1585a-3.3 1585afa part number description comments lt1129 700ma, micropower, ldo v in : 4.2v to 30v, v out(min) = 3.75v, v do at i out = 0.40v, i q = 50 a, i sd < 16 a, v out : adj, 3.3v, 5v, dd, sot-223, s8, to-220, tssop20 packages. lt1175 500ma, micropower negative, ldo v in : ?0v to ?.3v, v out(min) = ?.8v, v do at i out = 0.50v, i q = 45 a, i sd < 10 a, v out : adj, ?v, dd, sot-223, s8, n8 packages. guaranteed voltage tolerance and line/load regulation lt1185 3a, negative ldo v in : ?5v to ?.2v, v out(min) = ?.40v, v do at i out = 0.80v, i q = 2.5ma, i sd < 1 a, v out : adj, 5-lead to-220 package. accurate programmable current limit, remote sense lt1761 100ma, low noise micropower, ldo v in : 1.8v to 20v, v out(min) = 1.22v, v do at i out = 0.30v, i q = 20 a, i sd < 1 a, v out : adj, 1.5v, 1.8v, 2v, 2.5v, 2.8v, 3v, 3.3v 5v, thinsot package. low noise < 20 v rms , stable with 1 f ceramic capacitors lt1762 150ma, low noise micropower, ldo v in : 1.8v to 20v, v out(min) = 1.22v, v do at i out = 0.30v, i q = 25 a, i sd < 1 a, v out : adj, 2.5v, 3v, 3.3v, 5v, ms8 package. low noise < 20 v rms lt1763 500ma, low noise micropower, ldo v in : 1.8v to 20v, v out(min) = 1.22v, v do at i out = 0.30v, i q = 30 a, i sd < 1 a, v out : 1.5v, 1.8v, 2.5v, 3v, 3.3v, 5v, s8 package. low noise < 20 v rms lt1764/lt1764a 3a, low noise fast transient response, ldo v in : 2.7v to 20v, v out(min) = 1.21v, v do at i out = 0.34v, i q = 1ma, i sd < 1 a, v out : 1.8v, 2.5v, 3.3v, dd, to-220 packages. low noise < 40 v rms , ??version stable with ceramic capacitors ltc1844 150ma, very low dropout ldo v in : 1.6v to 6.5v, v out(min) = 1.25v, v do at i out = 0.08v, i q = 40 a, i sd < 1 a, v out : adj, 1.5v, 1.8v, 2.5v, 2.8v, 3.3v, thinsot package. low noise < 30 v rms , stable with 1 f ceramic capacitors lt1962 300ma, low noise micropower, ldo v in : 1.8v to 20v, v out(min) = 1.22v, v do at i out = 0.27v, i q = 30 a, i sd < 1 a, v out : adj, 1.5v, 1.8v, 2.5v, 3v, 3.3v, 5v, ms8 package. low noise < 20 v rms lt1963/lt1963a 1.5a, low noise fast transient response, ldo v in : 2.1v to 20v, v out(min) = 1.21v, v do at i out = 0.34v, i q = 1ma, i sd < 1 a, v out : 1.5v, 1.8v, 2.5v, 3.3v, dd, to-220, sot223, s8 packages. low noise < 40 v rms , ??version stable with ceramic capacitors lt1964 200ma, low noise micropower, negative ldo v in : 1.6v to ?0v, v out(min) = ?.21v, v do at i out = 0.34v, i q = 30 a, i sd < 3 a, v out : adj, ?v, thinsot package. low noise < 30 v rms , stable with ceramic capacitors lt/tp 0804 1k rev a ? printed in usa ? linear technology corporation 1995 package descriptio n u t package 3-lead plastic to-220 (reference ltc dwg # 05-08-1420) .100 (2.540) bsc .028 ?.038 (0.711 ?0.965) t3 (to-220) 0801 .045 ?.055 (1.143 ?1.397) .165 ?.180 (4.191 ?4.572) .095 ?.115 (2.413 ?2.921) .013 ?.023 (0.330 ?0.584) .520 ?.570 (13.208 ?14.478) .980 ?1.070 (24.892 ?27.178) .218 ?.252 (5.537 ?6.401) .050 (1.270) typ .147 ?.155 (3.734 ?3.937) dia .390 ?.415 (9.906 ?10.541) .330 ?.370 (8.382 ?9.398) .460 ?.500 (11.684 ?12.700) .570 ?.620 (14.478 ?15.748) .230 ?.270 (5.842 ?6.858) linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com related parts

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