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TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 1 post office box 655303 ? dallas, texas 75265 qualification in accordance with aec-q100 ? qualified for automotive applications customer-specific configuration control can be supported along with major-change approval esd protection exceeds 2000 v per mil-std-883, method 3015; exceeds 200 v using machine model (c = 200 pf, r = 0) 1 a low-dropout voltage regulator available in 1.5-v, 1.8-v, 2.5-v, 2.7-v, 2.8-v, 3.0-v, 3.3-v, 5.0-v fixed output and adjustable versions dropout voltage down to 230 mv at 1 a (tps76750) ultralow 85 a typical quiescent current fast transient response ? contact factory for details. q100 qualification data available on request. 2% tolerance over specified conditions for fixed-output versions open drain power-on reset with 200-ms delay (see tps768xx for pg option) 20-pin tssop powerpad ? (pwp) package thermal shutdown protection description this device is designed to have a fast transient response and be stable with 10- f low esr capacitors. this combination provides high performance at a reasonable cost. because the pmos device behaves as a low-value resistor, the dropout voltage is very low (typically 230 mv at an output current of 1 a for the tps76750) and is directly proportional to the output current. additionally, since the pmos pass element is a voltage-driven device, the quiescent current is very low and independent of output loading (typically 85 a over the full range of output current, 0 ma to 1 a). these two key specifications yield a significant improvement in operating life for battery-powered systems. this ldo family also features a sleep mode; applying a ttl high signal to en (enable) shuts down the regulator, reducing the quiescent current to 1 a at t j = 25 c. the reset output of the tps767xx initiates a reset in microcomputer and microprocessor systems in the event of an undervoltage condition. an internal comparator in the tps767xx monitors the output voltage of the regulator to detect an undervoltage condition on the regulated output voltage. the tps767xx is offered in 1.5-v, 1.8-v, 2.5-v, 2.7-v, 2.8-v, 3.0-v, 3.3-v, and 5.0-v fixed-voltage versions and in an adjustable version (programmable over the range of 1.5 v to 5.5 v). output voltage tolerance is specified as a maximum of 2% over line, load, and temperature ranges. the tps767xx family is available in a 20-pin pwp package. copyright ? 2003, texas instruments incorporated production data information is current as of publication date. products conform to specifications per the terms of texas instruments standard warranty. production processing does not necessarily include testing of all parameters. 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. nc ? no internal connection 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 gnd/hsink gnd/hsink gnd nc en in in nc gnd/hsink gnd/hsink gnd/hsink gnd/hsink nc nc reset fb/nc out out gnd/hsink gnd/hsink pwp package (top view) powerpad is a trademark of texas instruments.
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 2 post office box 655303 ? dallas, texas 75265 t a ? free-air temperature ? c ? 40 0 20 120 10 3 ? 60 40 60 80 100 ? dropout voltage ? mv v do tps76733 dropout voltage vs free-air temperature 10 2 10 1 10 0 10 ? 1 10 ? 2 ? 20 140 i o = 1 a i o = 10 ma i o = 0 c o = 10 f t ? time ? s tps76733 load transient response i ? output current ? a o v o ? change in ? output voltage ? mv 1 0.5 300 200 100 400 500 700 600 800 900 1000 0 c o = 10 f t a = 25 c 0 0 50 100 ? 50 ? 100 available options t j output voltage (v) tssop ( pwp ) ? typ (pwp) ? 5.0 tps76750qpwprq1 3.3 tps76733qpwprq1 3.0 tps76730qpwprq1 ? 2.8 tps76728qpwprq1 ? ? 40 cto125 c 2.7 tps76727qpwprq1 ? ? 40 c to 125 c 2.5 tps76725qpwprq1 1.8 tps76718qpwprq1 1.5 tps76715qpwprq1 adjustable 1.5 v to 5.5 v tps76701qpwprq1 ? available taped and reeled in quantities of 2000 per reel. ? this devices is product preview.
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 3 post office box 655303 ? dallas, texas 75265 ? see application information section for capacitor selection details. reset out out 7 6 5 in in en gnd 3 16 14 13 v i 0.1 f reset v o 10 f + tps767xx c o ? figure 1. typical application configuration (for fixed output options) functional block diagram ? adjustable version 200 ms delay _ + v ref = 1.1834 v out fb/nc en gnd reset _ + in external to the device r1 r2
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 4 post office box 655303 ? dallas, texas 75265 functional block diagram ? fixed-voltage version _ + v ref = 1.1834 v out en gnd r1 r2 reset _ + in 200 ms delay terminal functions pwp package terminal i/o description name no. i/o description en 5 i enable input fb/nc 15 i feedback input voltage for adjustable device (no connect for fixed options) gnd 3 regulator ground gnd/hsink 1, 2, 9, 10, 11, 12, 19, 20 ground/heatsink in 6, 7 i input voltage nc 4, 8, 17, 18 no connect out 13, 14 o regulated output voltage reset 16 o reset output
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 5 post office box 655303 ? dallas, texas 75265 timing diagram ? v res is the minimum input voltage for a valid reset . the symbol v res is not currently listed within eia or jedec standards for semiconductor symbology. ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? v i v res ? v res t t t v o threshold voltage reset output 200 ms delay 200 ms delay output undefined output undefined v it + ? v it ? ? v it ? ? v it + ? less than 5% of the output voltage ? v it ? trip voltage is typically 5% lower than the output voltage (95%v o ) v it ? to v it+ is the hysteresis voltage.
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 6 post office box 655303 ? dallas, texas 75265 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) input voltage range ? , v i ? 0.3 v to 13.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . voltage range at en ? 0.3 v to v i + 0.3 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . maximum reset voltage 16.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . peak output current internally limited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output voltage, v o (out, fb) 7 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous total power dissipation see dissipation rating tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating virtual junction temperature range, t j ? 40 c to 125 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range, t stg ? 65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . esd rating, hbm 2 kv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? 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. ? all voltage values are with respect to network terminal ground. dissipation rating table ? free-air temperatures package air flow (cfm) t a < 25 c power rating derating factor above t a = 25 c t a = 70 c power rating t a = 85 c power rating pwp 0 2.9 w 23.5 mw/ c 1.9 w 1.5 w pwp 300 4.3 w 34.6 mw/ c 2.8 w 2.2 w pwp ? 0 3 w 23.8 mw/ c 1.9 w 1.5 w pwp ? 300 7.2 w 57.9 mw/ c 4.6 w 3.8 w this parameter is measured with the recommended copper heat sink pattern on a 1-layer pcb, 5-in 5-in pcb, 1 oz. copper, 2-in 2-in coverage (4 in 2 ). ? this parameter is measured with the recommended copper heat sink pattern on a 8-layer pcb, 1.5-in 2-in pcb, 1 oz. copper with layers 1, 2, 4, 5, 7, and 8 at 5% coverage (0.9 in 2 ) and layers 3 and 6 at 100% coverage (6 in 2 ). for more information, refer to ti technical brief slma002. recommended operating conditions min max unit input voltage, v i # 2.7 10 v output voltage range, v o 1.5 5.5 v output current, i o (see note 1) 0 1.0 a operating virtual junction temperature, t j (see note 1) ? 40 125 c # to calculate the minimum input voltage for your maximum output current, use the following equation: v i(min) = v o(max) + v do(max load) . note 1: continuous current and operating junction temperature are limited by internal protection circuitry, but it is not recomm ended that the device operate under conditions beyond those specified in this table for extended periods of time.
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 7 post office box 655303 ? dallas, texas 75265 electrical characteristics over recommended operating free-air temperature range, v i = v o(typ) + 1 v, i o = 1 ma, en = 0 v, c o = 10 f (unless otherwise noted) parameter test conditions min typ max unit tps76701 1.5 v v o 5.5 v, t j = 25 c v o tps76701 1.5 v v o 5.5 v, t j = ? 40 c to 125 c 0.98v o 1.02v o tps76715 t j = 25 c, 2.7 v < v in < 10 v 1.5 tps76715 t j = ? 40 c to 125 c, 2.7 v < v in < 10 v 1.470 1.530 tps76718 t j = 25 c, 2.8 v < v in < 10 v 1.8 tps76718 t j = ? 40 c to 125 c, 2.8 v < v in < 10 v 1.764 1.836 tps76725 t j = 25 c, 3.5 v < v in < 10 v 2.5 tps76725 t j = ? 40 c to 125 c, 3.5 v < v in < 10 v 2.450 2.550 output volta g e (10 c, 3.7 v < v in < 10 v 2.7 v out ut voltage (10 a to 1 a load) (see note 2) tps76727 t j = ? 40 c to 125 c, 3.7 v < v in < 10 v 2.646 2.754 v tps76728 t j = 25 c, 3.8 v < v in < 10 v 2.8 tps76728 t j = ? 40 c to 125 c, 3.8 v < v in < 10 v 2.744 2.856 tps76730 t j = 25 c, 4.0 v < v in < 10 v 3.0 tps76730 t j = ? 40 c to 125 c, 4.0 v < v in < 10 v 2.940 3.060 tps76733 t j = 25 c, 4.3 v < v in < 10 v 3.3 tps76733 t j = ? 40 c to 125 c, 4.3 v < v in < 10 v 3.234 3.366 tps76750 t j = 25 c, 6.0 v < v in < 10 v 5.0 tps76750 t j = ? 40 c to 125 c, 6.0 v < v in < 10 v 4.900 5.100 quiescent current (gnd current) 10 a < i o < 1 a, t j = 25 c 85 a quiescent current (gnd current) en = 0v, (see note 2) i o = 1 a, t j = ? 40 c to 125 c 125 a output voltage line regulation ( ? v o /v o ) (see notes 2 and 3) v o + 1 v < v i 10 v, t j = 25 c 0.01 %/v load regulation 3 mv output noise voltage (tps76718) bw = 200 hz to 100 khz, i c = 1 a, c o = 10 f, t j = 25 c 55 vrms output current limit v o = 0 v 1.7 2 a thermal shutdown junction temperature 150 c standby current en = v i, t j = 25 c, 2.7 v < v i < 10 v 1 a standby current en = v i, t j = ? 40 c to 125 c 2.7 v < v i < 10 v 10 a fb input current tps76701 fb = 1.5 v 2 na high level enable input voltage 1.7 v low level enable input voltage 0.9 v power supply ripple rejection (see note 2) f = 1 khz, c o = 10 f, t j = 25 c 60 db notes: 2. minimum in operating voltage is 2.7 v or v o(typ) + 1 v, whichever is greater. maximum in voltage 10v. 3. if v o 1.8 v then v imax = 10 v, v imin = 2.7 v: line reg. (mv) % v v o v imax 2.7 v 100 1000 if v o 2.5 v then v imax = 10 v, v imin = v o + 1 v: line reg. (mv) % v v o v imax v o 1v 100 1000
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 8 post office box 655303 ? dallas, texas 75265 electrical characteristics over recommended operating free-air temperature range, v i = v o(typ) + 1 v, i o = 1 ma, en = 0 v, c o = 10 f (unless otherwise noted) (continued) parameter test conditions min typ max unit minimum input voltage for valid reset i o(reset) = 300 a 1.1 v trip threshold voltage v o decreasing 92 98 %v o reset hysteresis voltage measured at v o 0.5 %v o reset output low voltage v i = 2.7 v, i o(reset) = 1 ma 0.15 0.4 v leakage current v (reset) = 5 v 1 a reset time-out delay 200 ms input current (en ) en = 0 v ? 1 0 1 a input current (en ) en = v i ? 1 1 a tps76728 i o = 1 a, t j = 25 c 500 tps76728 i o = 1 a, t j = ? 40 c to 125 c 825 tps76730 i o = 1 a, t j = 25 c 450 dropout volta g e (see note 4) tps76730 i o = 1 a, t j = ? 40 c to 125 c 675 mv dro out voltage (see note 4) tps76733 i o = 1 a, t j = 25 c 350 mv tps76733 i o = 1 a, t j = ? 40 c to 125 c 575 tps76750 i o = 1 a, t j = 25 c 230 tps76750 i o = 1 a, t j = ? 40 c to 125 c 380 note 4: in voltage equals v o (typ) ? 100 mv; tps76701 output voltage set to 3.3 v nominal with external resistor divider. tps76715, tps76718, tps76725, and tps76727 dropout voltage limited by input voltage range limitations (i.e., tps76730 input voltage needs to drop t o 2.9 v for purpose of this test). typical characteristics table of graphs figure v output voltage vs output current 2, 3, 4 v o output voltage vs free-air temperature 5, 6, 7 ground current vs free-air temperature 8, 9 power supply ripple rejection vs frequency 10 output spectral noise density vs frequency 11 input voltage (min) vs output voltage 12 z o output impedance vs frequency 13 v do dropout voltage vs free-air temperature 14 line transient response 15, 17 load transient response 16, 18 v o output voltage vs time 19 dropout voltage vs input voltage 20 equivalent series resistance (esr) vs output current 22 ? 25
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 9 post office box 655303 ? dallas, texas 75265 typical characteristics figure 2 i o ? output current ? a tps76733 output voltage vs output current 3.2830 3.2815 3.2800 0.1 0.3 3.2825 3.2820 3.2810 0.2 0.8 1 3.2835 0 0.9 ? output voltage ? v v o 3.2805 0.4 0.5 0.6 0.7 v i = 4.3 v t a = 25 c figure 3 i o ? output current ? a 1.4975 1.4960 1.4950 1.4970 1.4965 1.4955 1.4985 ? output voltage ? v v o tps76715 output voltage vs output current 1.4980 0.1 0.3 0.2 0.8 1 0 0.9 0.4 0.5 0.6 0.7 v i = 2.7 v t a = 25 c figure 4 i o ? output current ? a tps76725 output voltage vs output current 2.4955 2.4940 2.4920 0.1 0.3 2.4950 2.4945 2.4935 0.2 0.4 0.6 2.4960 0 0.5 ? output voltage ? v v o v i = 3.5 v t a = 25 c 2.4930 2.4925 0.8 0.7 0.9 1 figure 5 t a ? free-air temperature ? c tps76733 output voltage vs free-air temperature ? output voltage ? v v o 3.31 3.28 3.25 ? 40 0 3.30 3.29 3.27 ? 20 100 140 3.32 ? 60 120 3.26 20 40 60 80 v i = 4.3 v i o = 1 a i o = 1 ma
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 10 post office box 655303 ? dallas, texas 75265 typical characteristics figure 6 t a ? free-air temperature ? c tps76715 output voltage vs free-air temperature ? output voltage ? v v o 1.515 1.500 1.485 ? 40 0 1.510 1.505 1.495 ? 20 100 ? 60 120 1.490 20 40 60 80 v i = 2.7 v i o = 1 a i o = 1 ma 140 figure 7 t a ? free-air temperature ? c tps76725 output voltage vs free-air temperature ? output voltage ? v v o ? 40 0 ? 20 100 ? 60 120 20 40 60 80 2.515 2.500 2.480 2.510 2.505 2.495 2.490 2.485 v i = 3.5 v i o = 1 a i o = 1 ma t a ? free-air temperature ? c tps76733 ground current vs free-air temperature ground current ? a 92 84 72 90 88 82 80 78 76 74 86 ? 40 0 ? 20 100 ? 60 120 20 40 60 80 140 v i = 4.3 v i o = 500 ma i o = 1 a i o = 1 ma figure 8
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 11 post office box 655303 ? dallas, texas 75265 typical characteristics figure 9 t a ? free-air temperature ? c tps76715 ground current vs free-air temperature ground current ? a ? 40 0 ? 20 100 ? 60 120 20 40 60 80 140 v i = 2.7 v i o = 1 a 100 95 90 85 80 75 i o = 1 ma i o = 500 ma 100k 10k psrr ? power supply ripple rejection ? db f ? frequency ? hz power supply ripple rejection vs frequency 70 60 50 40 30 20 10 0 ? 10 tps76733 90 80 1k 100 10 1m v i = 4.3 v c o = 10 f i o = 1 a t a = 25 c figure 10 tps76733 output spectral noise density vs frequency f ? frequency ? hz 10 2 10 3 10 4 10 5 10 ? 5 10 ? 6 10 ? 8 10 ? 7 i o = 7 ma i o = 1 a v i = 4.3 v c o = 10 f t a = 25 c v hz output spectral noise density ? figure 11
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 12 post office box 655303 ? dallas, texas 75265 typical characteristics figure 12 3 2.7 2 1.5 1.75 2 2.25 2.5 2.75 ? input voltage (min) ? v input voltage (min) vs output voltage 4 3 3.25 3.5 t a = 25 c v i v o ? output voltage ? v i o = 1 a t a = 125 c t a = ? 40 c figure 13 f ? frequency ? khz ? output impedance ? z o ? 10 1 10 2 10 5 10 6 0 10 ? 1 10 ? 2 10 4 10 3 i o = 1 ma i o = 1 a v i = 4.3 v c o = 10 f t a = 25 c tps76733 output impedance vs frequency figure 14 t a ? free-air temperature ? c ? 40 0 20 120 10 3 ? 60 40 60 80 100 ? dropout voltage ? mv v do tps76733 dropout voltage vs free-air temperature 10 2 10 1 10 0 10 ? 1 10 ? 2 ? 20 140 i o = 1 a i o = 10 ma i o = 0 c o = 10 f
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 13 post office box 655303 ? dallas, texas 75265 typical characteristics figure 15 v o ? change in 10 0 3.7 2.7 tps76715 line transient response v i t ? time ? s 060 40 20 80 100 140 120 160 180 200 ? input voltage ? v ? output voltage ? mv c o = 10 f t a = 25 c ? 10 figure 16 t ? time ? s tps76715 load transient response i ? output current ? a o v o ? change in ? output voltage ? mv c o = 10 f t a = 25 c 1 0.5 0 0 300 200 100 400 500 700 600 800 900 1000 0 50 100 ? 50 ? 100 figure 17 tps76733 line transient response t ? time ? s v o ? change in v i ? input voltage ? v ? output voltage ? mv 5.3 60 40 20 80 100 140 120 160 180 200 c o = 10 f t a = 25 c 0 4.3 10 0 ? 10 figure 18 t ? time ? s tps76733 load transient response i ? output current ? a o v o ? change in ? output voltage ? mv 1 0.5 300 200 100 400 500 700 600 800 900 1000 0 c o = 10 f t a = 25 c 0 0 50 100 ? 50 ? 100
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 14 post office box 655303 ? dallas, texas 75265 typical characteristics figure 19 t ? time ? ms tps76733 output voltage vs time (at startup) 3 2 0.3 0.2 0.1 0.4 0.5 0.7 0.6 0.8 0.9 1 0 v o ? output voltage ? v 0 1 4 enable pulse ? v 0 c o = 10 f i o = 1 a t a = 25 c figure 20 v i ? input voltage ? v 600 300 0 34 500 400 200 3.5 2.5 ? dropout voltage ? mv 100 4.5 5 v do 900 800 700 t a = 125 c t a = ? 40 c t a = 25 c i o = 1 a tps76701 dropout voltage vs input voltage in en out + gnd c o esr r l v i to load figure 21. test circuit for typical regions of stability (figures 22 through 25) (fixed output options)
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 15 post office box 655303 ? dallas, texas 75265 typical characteristics figure 22 0.1 0 200 400 600 800 1000 typical region of stability equivalent series resistance ? vs output current 10 i o ? output current ? ma 1 v o = 3.3 v c o = 4.7 f v i = 4.3 v t a = 25 c region of stability region of instability esr ? equivalent series resistance ? ? figure 23 typical region of stability equivalent series resistance ? vs output current i o ? output current ? ma esr ? equivalent series resistance ? ? 0.1 0 200 400 600 800 1000 10 1 v o = 3.3 v c o = 4.7 f v i = 4.3 v t j = 125 c region of stability region of instability figure 24 0.1 0 200 400 600 800 1000 typical region of stability equivalent series resistance ? vs output current 10 i o ? output current ? ma 1 region of instability region of stability v o = 3.3 v c o = 22 f v i = 4.3 v t a = 25 c esr ? equivalent series resistance ? ? figure 25 typical region of stability equivalent series resistance ? vs output current 0.1 0 200 400 600 800 1000 10 1 i o ? output current ? ma v o = 3.3 v c o = 22 f v i = 4.3 v t j = 125 c region of stability region of instability esr ? equivalent series resistance ? ? ? equivalent series resistance (esr) refers to the total series resistance, including the esr of the capacitor, any series resist ance added externally, and pwb trace resistance to c o .
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 16 post office box 655303 ? dallas, texas 75265 application information the tps767xx family includes eight fixed-output voltage regulators (1.5 v, 1.8 v, 2.5 v, 2.7 v, 2.8 v, 3.0 v, 3.3 v, and 5.0 v), and an adjustable regulator, the tps76701 (adjustable from 1.5 v to 5.5 v). device operation the tps767xx features very low quiescent current, which remains virtually constant even with varying loads. conventional ldo regulators use a pnp pass element, the base current of which is directly proportional to the load current through the regulator (i b = i c / ). the tps767xx uses a pmos transistor to pass current; because the gate of the pmos is voltage driven, operating current is low and invariable over the full load range. another pitfall associated with the pnp-pass element is its tendency to saturate when the device goes into dropout. the resulting drop in forces an increase in i b to maintain the load. during power up, this translates to large start-up currents. systems with limited supply current may fail to start up. in battery-powered systems, it means rapid battery discharge when the voltage decays below the minimum required for regulation. the tps767xx quiescent current remains low even when the regulator drops out, eliminating both problems. the tps767xx family also features a shutdown mode that places the output in the high-impedance state (essentially equal to the feedback-divider resistance) and reduces quiescent current to 2 a. if the shutdown feature is not used, en should be tied to ground. minimum load requirements the tps767xx family is stable even at zero load; no minimum load is required for operation. fb ? pin connection (adjustable version only) the fb pin is an input pin to sense the output voltage and close the loop for the adjustable option . the output voltage is sensed through a resistor divider network to close the loop as shown in figure 27. normally, this connection should be as short as possible; however, the connection can be made near a critical circuit to improve performance at that point. internally, fb connects to a high-impedance wide-bandwidth amplifier and noise pickup feeds through to the regulator output. routing the fb connection to minimize/avoid noise pickup is essential. external capacitor requirements an input capacitor is not usually required; however, a ceramic bypass capacitor (0.047 f or larger) improves load transient response and noise rejection if the tps767xx is located more than a few inches from the power supply. a higher-capacitance electrolytic capacitor may be necessary if large (hundreds of milliamps) load transients with fast rise times are anticipated. like all low dropout regulators, the tps767xx requires an output capacitor connected between out and gnd to stabilize the internal control loop. the minimum recommended capacitance value is 10 f and the esr (equivalent series resistance) must be between 50 m ? and 1.5 ? . capacitor values 10 f or larger are acceptable, provided the esr is less than 1.5 ? . solid tantalum electrolytic, aluminum electrolytic, and multilayer ceramic capacitors are all suitable, provided they meet the requirements described above. most of the commercially available 10 f surface-mount ceramic capacitors, including devices from sprague and kemet, meet the esr requirements stated above.
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 17 post office box 655303 ? dallas, texas 75265 application information external capacitor requirements (continued) reset out out 7 6 5 in in en gnd 3 16 14 13 v i c1 0.1 f reset v o 10 f + tps767xx c o 250 k ? figure 26. typical application circuit (fixed versions) programming the tps76701 adjustable ldo regulator the output voltage of the tps76701 adjustable regulator is programmed using an external resistor divider as shown in figure 27. the output voltage is calculated using: v o v ref 1 r1 r2 (1 ) where: v ref = 1.1834 v typ (the internal reference voltage) resistors r1 and r2 should be chosen for approximately 50- a divider current. lower value resistors can be used but offer no inherent advantage and waste more power. higher values should be avoided as leakage currents at fb increase the output voltage error. the recommended design procedure is to choose r2 = 30.1 k ? to set the divider current at 50 a and then calculate r1 using: r1 v o v ref 1 r2 (2) output voltage r1 r2 2.5 v 3.3 v 3.6 v 4.75 v unit 33.2 53.6 61.9 90.8 30.1 30.1 30.1 30.1 k ? k ? k ? k ? output voltage programming guide v o v i reset out fb / nc r1 r2 gnd en in 0.9 v 1.7 v tps76701 reset output 0.1 f 250 k ? c o figure 27. tps76701 adjustable ldo regulator programming
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 18 post office box 655303 ? dallas, texas 75265 application information reset indicator the tps767xx features a reset output that can be used to monitor the status of the regulator. the internal comparator monitors the output voltage: when the output drops to between 92% and 98% of its nominal regulated value, the reset output transistor turns on, taking the signal low. the open-drain output requires a pullup resistor. if not used, it can be left floating. reset can be used to drive power-on reset circuitry or as a low-battery indicator. reset does not assert itself when the regulated output voltage falls outside the specified 2% tolerance, but instead reports an output voltage low relative to its nominal regulated value (refer to timing diagram for start-up sequence). regulator protection the tps767xx pmos-pass transistor has a built-in back diode that conducts reverse currents when the input voltage drops below the output voltage (e.g., during power down). current is conducted from the output to the input and is not internally limited. when extended reverse voltage is anticipated, external limiting may be appropriate. the tps767xx also features internal current limiting and thermal protection. during normal operation, the tps767xx limits output current to approximately 1.7 a. when current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. while current limiting is designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the package. if the temperature of the device exceeds 150 c(typ), thermal-protection circuitry shuts it down. once the device has cooled below 130 c(typ), regulator operation resumes. power dissipation and junction temperature specified regulator operation is assured to a junction temperature of 125 c; the maximum junction temperature should be restricted to 125 c under normal operating conditions. this restriction limits the power dissipation the regulator can handle in any given application. to ensure the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, p d(max) , and the actual dissipation, p d , which must be less than or equal to p d(max) . the maximum-power-dissipation limit is determined using the following equation: p d(max) t j max t a r ja where: t j max is the maximum allowable junction temperature. t a is the ambient temperature. r ja is the thermal resistance junction-to-ambient for the package, i.e., 172 c/w for the 8-terminal soic and 32.6 c/w for the 20-terminal pwp with no airflow. the regulator dissipation is calculated using: p d v i v o i o power dissipation resulting from quiescent current is negligible. excessive power dissipation will trigger the thermal protection circuit.
TPS76715-Q1, tps76718-q1, tps76725-q1, tps76727-q1 tps76728-q1, tps76730-q1, tps76733-q1, tps76750-q1, tps76701-q1 fast-transient-response 1-a low-dropout voltage regulators sgls009 ? march 2003 19 post office box 655303 ? dallas, texas 75265 mechanical data pwp (r-pdso-g**) powerpad ? plastic small-outline 4073225/f 10/98 0,50 0,75 0,25 0,15 nom thermal pad (see note d) gage plane 28 24 7,70 7,90 20 6,40 6,60 9,60 9,80 6,60 6,20 11 0,19 4,50 4,30 10 0,15 20 a 1 0,30 1,20 max 16 14 5,10 4,90 pins ** 4,90 5,10 dim a min a max 0,05 seating plane 0,65 0,10 m 0,10 0 ? 8 20 pins shown notes: a. all linear dimensions are in millimeters. b. this drawing is subject to change without notice. c. body dimensions do not include mold flash or protrusions. d. the package thermal performance may be enhanced by bonding the thermal pad to an external thermal plane. this pad is electrically and thermally connected to the backside of the die and possibly selected leads. e. falls within jedec mo-153 powerpad is a trademark of texas instruments incorporated.

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