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dmos 100ma low-dropout regulator reg101 features new dmos topology: ultra low dropout voltage: 60mv typ at 100ma output capacitor not required for stability fast transient response very low noise: 23 vrms high accuracy: 1.5% max high efficiency: i gnd = 500 a at i out = 100ma not enabled: i gnd = 10na 2.5v, 2.8v, 2.85v, 3.0v, 3.3v, 5.0v and adjustable output versions other output voltages available upon request foldback current limit thermal protection small surface-mount packages: sot23-5 and so-8 applications portable communication devices battery-powered equipment personal digital assistants modems bar-code scanners backup power supplies description the reg101 is a family of low noise, low dropout linear regulators with low ground pin current. its new dmos topology provides significant improvement over previous designs, including low dropout voltage (only 60mv typ at full load), and better transient performance. in addition, no output capacitor is re- quired for stability, unlike conventional low dropout regulators that are difficult to compensate and require expensive low esr capacitors greater than 1 f. typical ground pin current is only 500 a (at i out = 100ma) and drops to 10na when not enabled mode. unlike regulators with pnp pass devices, quiescent current remains relatively constant over load variation and under dropout conditions. the reg101 has very low output noise (typically 23 vrms for v out = 3.3v with c nr = 0.01 f), making it ideal for use in portable communications equipment. accuracy is maintained over temperature, line, and load variations. key parameters are guaran- teed over the specified temperature range (?0 c to +85 c). the reg101 is well protected?nternal circuitry pro- vides a current limit which protects the load from damage. thermal protection circuitry keeps the chip from being damaged by excessive temperature. the reg101 is available in the sot23-5 and the so-8 packages. copyright ?2000, texas instruments incorporated sbvs026b printed in u.s.a. february, 2001 reg101 (fixed voltage versions) enable gnd 0.1 f c out (1) + + v out v in nr nr = noise reduction note: (1) optional. reg101-a gnd enable 0.1 f + c out (1) + v out v in r 2 r 1 adj www.ti.com reg101
reg101 2 sbvs026b specifications boldface limits apply over the specified temperature range, t j = C40 c to +85 c. at t j = +25 c, v in = v out + 1v (v out = 2.5v for reg101-a), v enable = 1.8v, i out = 2ma, c nr = 0.01 f, and c out = 0.1 f (1) , unless otherwise noted. reg101na reg101ua parameter condition min typ max units output voltage output voltage v out reg101-2.5 2.5 v reg101-2.8 2.8 v reg101-2.85 2.85 v reg101-3.0 3.0 v reg101-3.3 3.3 v reg101-5 5v reg101-a 2.5 5.5 v reference voltage v ref 1.267 v adjust pin current i adj 0.2 1 a accuracy 0.5 1.5 % over temperature 2.2 % vs temperature dv out /dt 50 ppm/ c includes line and load i out = 2ma to 100ma, v in = (v out + 0.4v) to 10v 0.8 2.0 % over temperature v in = (v out + 0.6v) to 10v 2.7 % dc dropout voltage (2) v drop i out = 2ma 4 10 mv for all models i out = 100ma 60 100 mv over temperature i out = 100ma 130 mv voltage noise v n f = 10hz to 100khz without c nr c nr = 0, c out = 0 23 vrms/v ?v out vrms with c nr (all fixed voltage models) c nr = 0.01 f, c out = 10 f7 vrms/v ?v out vrms output current current limit (3) i cl 130 170 220 ma over temperature 110 240 ma short circuit current i sc 60 ma ripple rejection f = 120hz i out = 100ma 65 db enable control v enable high (output enabled) v enable 1.8 v in v v enable low (output disabled) ?.2 0.5 v i enable high (output enabled) i enable v enable = 1.8v to v in , v in = 1.8v to 6.5 1 100 na i enable low (output disabled) v enable = 0v to 0.5v 2 100 na output disable time c out = 1.0 f, r load = 33 ? 200 s output enable time c out = 1.0 f, r load = 33 ? 1.5 ms thermal shutdown junction temperature shutdown 160 c reset from shutdown 140 c ground pin current ground pin current i gnd i out = 2ma 400 500 a i out = 100ma 500 650 a enable pin low v enable 0.5v 0.01 0.2 a input voltage v in operating input voltage range (4) 1.8 10 v specified input voltage range v in > 1.8v v out + 0.4 10 v over temperature v in > 1.8v v out + 0.6 10 v temperature range specified range t j ?0 +85 c operating range t j ?5 +125 c storage range t a ?5 +150 c thermal resistance sot23-5 surface mount ja junction-to-ambient 200 c/w so-8 surface mount ja junction-to-ambient 150 c/w notes: (1) the reg101 does not require a minimum output capacitor for stability. however, transient response can be improved wi th proper capacitor selection. (2) dropout voltage is defined as the input voltage minus the output voltage that produces a 2% change in the output voltage from the value at v in = v out + 1v at fixed load. (3) current limit is the output current that produces a 10% change in output voltage from v in = v out + 1v and i out = 2ma. (4) the reg101 no longer regulates when v in < v out + v drop (max) . in drop-out the impedance from v in to v out is typically less than 1 ? at t j = +25 c.
reg101 3 sbvs026b pin configurations top view absolute maximum ratings (1) supply input voltage, v in ....................................................... ?.3v to 12v enable input ............................................................................ ?.3v to v in output short-circuit duration ...................................................... indefinite operating temperature range (t j ) ................................ ?5 c to +125 c storage temperature range (t a ) ................................... ?5 c to +150 c lead temperature (soldering, 3s, sot23-5, and so-8) ..................... +240 c note: (1) stresses above these ratings may cause permanent damage. exposure to absolute maximum conditions for extended periods may degrade device reliability. electrostatic discharge sensitivity this integrated circuit can be damaged by esd. burr-brown recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degrada- tion to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. v out (2) v out (2) nr/adjust (1) gnd v in (3) v in (3) nc enable so-8 1 2 3 4 8 7 6 5 (u package) v in gnd enable v out nr/adjust (1) sot23-5 1 2 3 5 4 (n package) note: (1) for reg101a-a: voltage setting resistor pin. all other models: noise reduction capacitor pin. (2) both pin 1 and pin 2 must be connected. (3) both pin 7 and pin 8 must be connected.
reg101 4 sbvs026b 5v output reg101na-5 sot23-5 331 r01b reg101na-5/250 tape and reel " """ reg101na-5/2k5 tape and reel reg101ua-5 so-8 182 reg101u50 reg101ua-5 rails " """ reg101ua-5/2k5 tape and reel 3.3v output reg101na-3.3 sot23-5 331 r01c reg101na-3.3/250 tape and reel " """ reg101na-3.3/2k5 tape and reel reg101ua-3.3 so-8 182 reg101u33 reg101ua-3.3 rails " """ reg101ua-3.3/2k5 tape and reel 3v output reg101na-3 sot23-5 331 r01d reg101na-3/250 tape and reel " """ reg101na-3/2k5 tape and reel reg101ua-3 so-8 182 reg101u30 reg101ua-3 rails " """ reg101ua-3/2k5 tape and reel 2.85v output reg101na-2.85 sot23-5 331 r01n reg101na-2.85/250 tape and reel " """ reg101na-2.85/2k5 tape and reel reg101ua-2.85 so-8 182 reg101285 reg101ua-2.85 rails " """ reg101ua-2.85/2k5 tape and reel 2.8v output reg101na-2.8 sot23-5 331 r01e reg101na-2.8/250 tape and reel " """ reg101na-2.8/2k5 tape and reel reg101ua-2.8 so-8 182 reg101u28 reg101ua-2.8 rails " """ reg101ua-2.8/2k5 tape and reel 2.5v output reg101na-2.5 sot23-5 331 r01g reg101na-2.5/250 tape and reel " """ reg101na-2.5/2k5 tape and reel reg101ua-2.5 so-8 182 reg101u25 reg101ua-2.5 rails " """ reg101ua-2.5/2k5 tape and reel adjustable output reg101na-a sot23-5 331 r01a reg101na-a/250 tape and reel " """ reg101na-a/2k5 tape and reel reg101ua-a so-8 182 reg101ua reg101ua-a rails " """ reg101ua-a/2k5 tape and reel package/ordering information note: (1) models with a slash (/) are available only in tape and reel in the quantities indicated (e.g., /2k5 indicates 2500 de vices per reel). ordering 2500 pieces of reg101ua-5/2k5 will get a single 2500-piece tape and reel. many custom output voltage versions, from 2.5v to 5.1v in 50mv increments, are available upon request. minimum order quantities apply. contact factory for details. package drawing package ordering transport product package number marking number (1) media
reg101 5 sbvs026b typical performance curves for all models, at t j = +25 c and v enable = 1.8v, unless otherwise noted. 20 040 10 30 60 50 70 80 90 100 0.80 0.60 0.40 0.20 0.00 0.20 0.40 0.60 0.80 output voltage change (%) i out (ma) output voltage change vs i out (v in = v out + 1v, output voltage % change refered to i out = 50ma at +25 c) 55 c +125 c +25 c 25 50 0 75 25 50 100 125 0.0% 0.1% 0.2% 0.3% 0.4% output voltage change (%) temperature ( c) load regulation vs temperature (v in = v out + 1v) 10ma < i out < 100ma 2ma < i out < 1000ma 50 25 0 25 50 75 100 125 0.10 0.08 0.06 0.04 0.02 0.00 0.02 0.04 0.06 0.08 0.10 output voltage change (%) temperature ( c) line regulation vs temperature i out = 100ma (v out + 1v) < v in < 10v (v out + 0.4v) < v in < 10v 0 10 100 100 80 60 40 20 0 dc dropout voltage (mv) i out (ma) dc dropout voltage vs i out 20 30 40 50 60 70 80 90 55 c +125 c +25 c 012345 8 67 20 15 10 5 0 5 10 15 20 output voltage change (mv) v in v out (v) line regulation (referred to v in = v out + 1v at i out = 50ma) i out = 2ma i out = 50ma i out = 100ma 50 125 100 75 50 25 0 25 100 80 60 40 20 0 dc dropout voltage (mv) temperature ( c) dc dropout voltage vs temperature i out = 100ma
reg101 6 sbvs026b typical performance curves (cont.) for all models, at t j = +25 c and v enable = 1.8v, unless otherwise noted. 50 25 25 0 50 75 100 125 0.50 0.40 0.30 0.20 0.10 0.00 0.10 0.20 0.30 0.40 0.50 output voltage change (%) temperature ( c) output voltage vs temperature (output voltage % change referred to i out = 50ma at +25 c) i out = 2ma i out = 100ma i out = 50ma 50 25 25 0 50 75 100 125 1 100n 10n 1n 100p i gnd (a) temperature ( c) ground pin current, not enabled vs temperature v enable = 0.5v v in = v out + 1v 1.0 0.8 0.6 0.4 0.2 0.0 0.2 0.4 0.6 0.8 1.0 18 16 14 12 10 8 6 4 2 0 percentage of units (%) error (%) output voltage accuracy histogram 0 10 20 30 40 50 60 70 80 90 100 5 15 25 35 45 55 65 75 85 95 30 25 20 15 10 5 0 percentage of units (%) v out drift (ppm/ c) output voltage drift histogram 02030 10 50 40 70 60 90 80 100 600 500 400 300 200 100 0 i gnd ( a) i out (ma) ground pin current vs i out v out = 2.5v v in = v out + 1v v out = 3.3v v out = 5.0v 50 25 0 25 50 75 125 100 600 575 550 525 500 475 450 425 400 i gnd ( a) temperature ( c) ground pin current vs temperature i out = 100ma v out = 5v v out = 3.3v v out = 2.5v v in = v out + 1v
reg101 7 sbvs026b typical performance curves (cont.) for all models, at t j = +25 c and v enable = 1.8v, unless otherwise noted. 10 100 1k 10k 100k 10 1 0.1 0.01 e n ( v/ hz) frequency (hz) noise spectral density i out = 100ma c nr = 0 f c out = 1 f c out = 0 f c out = 10 f 10 100 1k 10k 100k 10 1 0.1 0.01 e n ( v/ hz) frequency (hz) noise spectral density i out = 100ma c nr = 0.01 f c out = 1 f c out = 0 f c out = 10 f 0 0.1 0.4 0.2 0.3 0.5 0.6 0.7 1 0.8 0.9 30 25 20 15 10 5 0 ripple rejection (db) v in - v out (v) ripple rejection vs (v in - v out ) reg101-3.3 frequency = 100khz c out = 10 f i out = 100ma 0.1 110 60 50 40 30 20 10 0 noise voltage ( vrms) c out ( f) rms noise voltage vs c out reg101-5.0 reg101-3.3 reg101-2.5 c nr = 0.01 f 10hz < bw < 100khz 110 1k 100 10k 110 100 90 80 70 60 50 40 30 20 noise voltage ( vrms) c nr (pf) rms noise voltage vs c nr c nr = 0 f 10hz < bw < 100khz reg101-5.0 reg101-2.5 reg101-3.3 10 100 1k 10k 100k 10m 1m 80 70 60 50 40 30 20 10 0 ripple rejection (db) frequency (hz) ripple rejection vs frequency i out = 2ma i out = 100ma i out = 2ma c out = 10 f i out = 100ma c out = 10 f c out = 0 f
reg101 8 sbvs026b typical performance curves (cont.) for all models, at t j = +25 c and v enable = 1.8v, unless otherwise noted. 50 25 i sc 125 180 160 140 120 100 80 60 40 i out (ma) temperature ( c) current limit vs temperature i cl 0 255075100 v in = v out + 1v line transient response 50 s/div 5.3v 50mv/div 50mv/div v in v out v out 4.3v reg101-3.3 i out = 100ma c out = 0 c out = 10 f load transient response 10 s/div reg101-3.3 v in = 4.3v 100ma 200mv/div 200mv/div i out v out v out 10ma c out = 0 f c out = 10 f turn-off 200 s/div 1v/div 1v/div v enable v out reg101-3.3 c nr = 0.01 f c out = 0 f r load = 1600 ? c out = 10 f r load = 33 ? c out = 1.0 f r load = 33 ? turn-on 250 s/div 1v/div 1v/div v enable v out reg101-3.3 v in = v out + 1v c nr = 0.01 f c out = 0 f r load = 33 ? c out = 10 f r load = 33 ? c out = 0 f r load = 1600 ? 040 20 140 160 80 100 120 60 180 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 output voltage (v) output current (ma) foldback current limit i cl i sc reg101-3.3
reg101 9 sbvs026b typical performance curves (cont.) for all models, at t j = +25 c and v enable = 1.8v, unless otherwise noted. 678910 10 1 100n 10n 1n i enable (a) v enable (v) i enable vs v enable t = +25 c t = 55 c t = +125 c power up/power down 1s/div 500mv/div v out = 3.0v r load = 30 ? v out v in 10 100 1k 10k 100k 80 70 60 50 40 30 20 v n (rms) c adj (pf) rms noise voltage vs c adj reg101 a v out = 3.3v c out = 0.1 f 10hz < frequency < 100khz 50 25 0 25 50 75 100 125 0.350 0.300 0.250 0.200 0.150 0.100 0.050 0.000 i adj ( a) temperature ( c) adjust pin current vs temperature 200mv/div 200mv/div 10ma v out c out = 0 reg101 a v in = 4.3v v out = 3.3v c out = 10 f v out i out 100ma load transient-adjustable version 50mv/div 50mv/div 4.3v v out c out = 0 reg101 a i out = 100ma c fb = 0.01 f v out = 3.3v c out = 10 f v out v in 5.3v line transient-adjustable version
reg101 10 sbvs026b basic operation the reg101 series of ldo (low drop-out) linear regula- tors offers a wide selection of fixed output voltage versions and an adjustable output version. the reg101 belongs to a family of new generation ldo regulators that utilize a dmos pass transistor to achieve ultra-low dropout perfor- mance and freedom from output capacitor constraints. ground pin current remains under 650 a over all line, load and temperature conditions. all versions have thermal and over- current protection, including fold-back current limit. the reg101 does not require an output capacitor for regu- lator stability and is stable over most output currents and with almost any value and type of output capacitor up to 10 f or more. for applications where the regulator output current drops below several milliamps, stability can be enhanced by: adding a 1k ? to 2k ? load resistor; using capacitance values less than 10 f; or keeping the effective series resistance greater than 0.05 ? including the capacitor? esr and parasitic resistance in printed circuit board traces, solder joints, and sockets. although an input capacitor is not required it is good analog design practice to connect a 0.1 f low esr capacitor across figure 1. fixed voltage nominal circuit for reg101. reg101 enable v out c out v in 0.1 f c nr 0.01 f gnd nr in out optional the input supply voltage. this is recommended to improve ripple rejection by reducing input voltage ripple. figure 1 shows the basic circuit connections for the fixed voltage models. figure 2 gives the connections for the adjustable output version (reg101a) and example resistor values for some commonly used output voltages. values for other voltages can be calculated from the equation shown in figure 2. internal current limit the reg101 internal current limit has a typical value of 170ma. a foldback feature limits the short-circuit current to a typical short-circuit value of 60ma. this helps to protect the regulator from damage under all load conditions. a curve of v out versus i out is given in figure 3 and in the typical performance curves section. figure 2. adjustable voltage circuit for reg101a. figure 3. foldback current limit of the reg101-3.3 at 25 c. 040 20 140 160 80 100 120 60 180 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 output voltage (v) output current (ma) foldback current limit i cl i cl reg101-3.3 v out = (1 + r 1 /r 2 ) 1.267v pin numbers for sot23 package. reg101 v in 0.1 f 2 1 gnd v out r 1 c fb 0.01 f c out adj r 2 i adj load 5 4 3 enable to reduce current through divider, increase resistor values (see table at right). as the impedance of the resistor divider increases, i adj (~200na) may introduce an error. c fb improves noise and transient response. optional v out (v) r 1 ( ? ) (1) r 2 ( ? ) (1) 1.267 short open 2.5 11.3k 11.5k 1.13k 1.15k 3.0 15.8k 11.5k 1.58k 1.15k 3.3 18.7k 11.5k 1.87k 1.15k 5.0 34.0k 11.5k 3.40k 1.15k note: (1) resistors are standard 1% values. example resistor values
reg101 11 sbvs026b figure 4. block diagram. figure 5. output noise vs noise reduction capacitor. enable the enable pin is active high and compatible with stan- dard ttl-cmos levels. inputs below 0.5v (max) turn the regulator off and all circuitry is disabled. under this condi- tion ground pin current drops to approximately 10na. when a pull-up resistor is used, and operation down to v in = 1.8v is required, use values < 50k ? . output noise a precision band-gap reference is used for the internal reference voltage, v ref . this reference is the dominant noise source within the reg101 and it generates approxi- mately 29 vrms in the 10hz to 100khz bandwidth at the reference output. the regulator control loop gains up the reference noise, so that the noise voltage of the regulator is approximately given by: since the value of v ref is 1.267v, this relationship reduces to: connecting a capacitor, c nr , from the noise reduction (nr) pin to ground, as shown in figure 4, forms a low-pass filter for the voltage reference. for c nr = 10nf, the total noise in the 10hz to 100khz bandwidth is reduced by approximately a factor of 2.8 for v o = 3.3v. this noise reduction effect is shown in figure 5 and as ?ms noise voltage vs cnr?in the typical performance curves section. noise can be further reduced by carefully choosing an output capacitor, c out . best overall noise performance is achieved with very low (< 0.22 f) or very high (> 2.2 f) values of c out . see ?ms noise voltage vs c out ?in the typical performance curves section. the reg101 utilizes an internal charge pump to develop an internal supply voltage sufficient to drive the gate of the dmos pass element above v in . the charge-pump switch- ing noise (nominal switching frequency = 2mhz) is not measurable at the output of the regulator over most values of c out and i out . the reg101 adjustable version does not have the noise- reduction pin available, however, the adjust pin is the sum- ming junction of the error amplifier. a capacitor, c fb , connected from the output to the adjust pin will reduce both the output noise and the peak error from a load transient. see the typical performance curves for output noise perfor- mance. v vrms rr r vrms v v n out ref = + = ? 29 2 29 12 v vrms v v n out = ? 23 over current over temp protection v ref (1.26v) low noise charge pump dmos pass transistor r 1 note: r 1 and r 2 are internal on fixed output versions. v out adj (adjustable versions) r 2 nr (fixed output versions only) enable reg101 v in c nr (optional) 110 1k 100 10k 110 100 90 80 70 60 50 40 30 20 noise voltage ( vrms) c nr (pf) rms noise voltage vs c nr c nr = 0 f 10hz < bw < 100khz reg101-5.0 reg101-2.5 reg101-3.3
reg101 12 sbvs026b figure 6. transient and dc dropout. drop-out voltage the reg101 uses an n-channel dmos as the ?ass element. when the input voltage is within a few tens of millivolts of the output voltage, the dmos device behaves like a resistor. therefore, for low values of v in to v out , the regulator? input-to-output resistance is the rds on of the dmos pass element (typically 600m ?) . for static (dc) loads, the reg101 will typically maintain regulation down to v in to v out voltage drop of 60mv at full rated output current. in figure 6, the bottom line (dc dropout) shows the minimum v in to v out voltage drop required to prevent drop-out under dc load conditions. for large step changes in load current, the reg101 requires a larger voltage drop across it to avoid degraded transient response. the boundary of this ?ransient drop-out?region is shown as the top line in figure 6. values of v in to v out voltage drop above this line insure normal transient re- sponse. in the transient dropout region between ?c?and ?ran- sient? transient response recovery time increases. the time required to recover from a load transient is a function of both the magnitude and rate of the step change in load current and the available ?eadroom?v in to v out voltage drop. under worst-case conditions (full-scale load change with v in to v out voltage drop close to dc dropout levels), the reg101 can take several hundred microseconds to re-enter the speci- fied window of regulation. transient response the reg101 response to transient line and load conditions improves at lower output voltages. the addition of a capaci- tor (nominal value 0.47 f) from the output pin to ground may improve the transient response. in the adjustable ver- sion, the addition of a capacitor, c fb (nominal value 10nf), from the output to the adjust pin will also improve the transient response. thermal protection the reg101 has thermal shutdown circuitry that protects the regulator from damage. the thermal protection circuitry disables the output when the junction temperature reaches approximately 160 c, allowing the device to cool. when the junction temperature cools to approximately 140 c, the output circuitry is again enabled. depending on various conditions, the thermal protection circuit may cycle on and off. this limits the dissipation of the regulator, but may have an undesirable effect on the load. any tendency to activate the thermal protection circuit indicates excessive power dissipation or an inadequate heat sink. for reliable operation, junction temperature should be limited to 125 c, maximum. to estimate the margin of safety in a complete design (including heat sink), increase the ambient temperature until the thermal protection is triggered. use worst-case loads and signal conditions. for good reliability, thermal protection should trigger more than 35 c above the maximum expected ambient condition of your application. this produces a worst-case junction tem- perature of 125 c at the highest expected ambient tempera- ture and worst-case load. the internal protection circuitry of the reg101 has been designed to protect against overload conditions. it was not intended to replace proper heat sinking. continuously run- ning the reg101 into thermal shutdown will degrade reli- ability. 140 120 100 80 60 40 20 0 dropout voltage (mv) 0 25 50 75 100 150 125 i out (ma) dc full scale i out transient
reg101 13 sbvs026b figure 7. maximum power dissipation versus ambient temperature for the various packages. pvv i d in out out avg =? ( ) () power dissipation the reg101 is available in two different package configu- rations. the ability to remove heat from the die is different for each package type and, therefore, presents different considerations in the printed circuit-board layout. the pcb area around the device that is free of other components moves the heat from the device to the ambient air. while it is difficult-to-impossible to quantify all of the variables in a thermal design of this type, performance data for several configurations are shown in figure 7. power dissipation depends on input voltage, load condition and duty cycle. power dissipation is equal to the product of the average output current times the voltage across the output element, v in to v out voltage drop. power dissipation can be minimized by using the lowest possible input voltage necessary to assure the required output voltage. regulator mounting solder pad footprint recommendations for the various reg101 devices are presented in application bulletin ?older pad recommendations for surface-mount devices (ab-132), available from the texas instruments web site (www.ti.com). 1.2 1.0 0.8 0.6 0.4 0.3 0 power dissipation (watts) 0 25 50 75 100 125 ambient temperature ( c) conditions sot23-5 so-8 package ja sot23-5 200 c/w so-8 150 c/w
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