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tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 1 post office box 655303 ? dallas, texas 75265 33-m w (5-v input) high-side mosfet switch short-circuit and thermal protection overcurrent logic output operating range . . . 2.7 v to 5.5 v logic-level enable input typical rise time . . . 6.1 ms undervoltage lockout maximum standby supply current ...10 m a no drain-source back-gate diode available in 8-pin soic and pdip packages ambient temperature range, 40 c to 85 c 2-kv human-body-model, 200-v machine-model esd protection description the tps202x family of power distribution switches is intended for applications where heavy capacitive loads and short circuits are likely to be encountered. these devices are 50-m w n-channel mosfet high-side power switches. the switch is controlled by a logic enable compatible with 5-v logic and 3-v logic. gate drive is provided by an internal charge pump designed to control the power-switch rise times and fall times to minimize current surges during switching. the charge pump requires no external components and allows operation from supplies as low as 2.7 v. when the output load exceeds the current-limit threshold or a short is present, the tps202x limits the output current to a safe level by switching into a constant-current mode, pulling the overcurrent (oc ) logic output low. when continuous heavy overloads and short circuits increase the power dissipation in the switch, causing the junction temperature to rise, a thermal protection circuit shuts off the switch to prevent damage. recovery from a thermal shutdown is automatic once the device has cooled sufficiently. internal circuitry ensures the switch remains off until valid input voltage is present. the tps202x devices differ only in short-circuit current threshold. the tps2020 limits at 0.3-a load, the tps2021 at 0.9-a load, the tps2022 at 1.5-a load, the tps2023 at 2.2-a load, and the tps2024 at 3-a load (see available options). the tps202x is available in an 8-pin small-outline integrated-circuit (soic) package and in an 8-pin dual-in-line (dip) package and operates over a junction temperature range of 40 c to 125 c. tps201xa tps202x tps203x 33 m w , single 0.2 a 2 a 0.2 a 2 a 0.2 a 2 a tps2014 tps2015 tps2041 tps2051 tps2045 tps2055 80 m w , single 600 ma 1 a 500 ma 500 ma 250 ma 250 ma general switch catalog tps2042 tps2052 tps2046 tps2056 80 m w , dual 500 ma 500 ma 250 ma 250 ma tps2100/1 260 m w in1 500 ma in2 10 ma out in1 in2 tps2102/3/4/5 in1 500 ma in2 100 ma 1.3 w tps2043 tps2053 tps2047 tps2057 80 m w , triple 500 ma 500 ma 250 ma 250 ma tps2044 tps2054 tps2048 tps2058 80 m w , quad 500 ma 500 ma 250 ma 250 ma copyright ? 1999, 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. 1 2 3 4 8 7 6 5 gnd in in en out out out oc d or p package (top view)
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 2 post office box 655303 ? dallas, texas 75265 available options recommended maximum continuous typical short-circuit packaged devices t a enable maximum continuous load current (a) current limit at 25 c (a) small outline (d) 2 plastic dip (p) 0.2 0.3 tps2020d tps2020p 0.6 0.9 tps2021d tps2021p 40 c to 85 c active low 1 1.5 tps2022d tps2022p 1.5 2.2 tps2023d tps2023p 2 3 tps2024d tps2024p 2 the d package is available taped and reeled. add an r suffix to device type (e.g., tps2020dr) tps2020 functional block diagram out oc in en gnd current limit driver uvlo charge pump cs thermal sense power switch 2 2 current sense terminal functions terminal name no. d or p i/o description en 4 i enable input. logic low turns on power switch. gnd 1 i ground in 2, 3 i input voltage oc 5 o overcurrent. logic output active low out 6, 7, 8 o power-switch output
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 3 post office box 655303 ? dallas, texas 75265 detailed description power switch the power switch is an n-channel mosfet with a maximum on-state resistance of 50 m w (v i(in) = 5 v). configured as a high-side switch, the power switch prevents current flow from out to in and in to out when disabled. charge pump an internal charge pump supplies power to the driver circuit and provides the necessary voltage to pull the gate of the mosfet above the source. the charge pump operates from input voltages as low as 2.7 v and requires very little supply current. driver the driver controls the gate voltage of the power switch. to limit large current surges and reduce the associated electromagnetic interference (emi) produced, the driver incorporates circuitry that controls the rise times and fall times of the output voltage. the rise and fall times are typically in the 2-ms to 9-ms range. enable ( en ) the logic enable disables the power switch, the bias for the charge pump, driver, and other circuitry to reduce the supply current to less than 10 m a when a logic high is present on en . a logic zero input on en restores bias to the drive and control circuits and turns the power on. the enable input is compatible with both ttl and cmos logic levels. overcurrent ( oc ) the oc open drain output is asserted (active low) when an overcurrent or overtemperature condition is encountered. the output will remain asserted until the overcurrent or overtemperature condition is removed. current sense a sense fet monitors the current supplied to the load. the sense fet measures current more efficiently than conventional resistance methods. when an overload or short circuit is encountered, the current-sense circuitry sends a control signal to the driver. the driver, in turn, reduces the gate voltage and drives the power fet into its saturation region, which switches the output into a constant current mode and holds the current constant while varying the voltage on the load. thermal sense an internal thermal-sense circuit shuts off the power switch when the junction temperature rises to approximately 140 c. hysteresis is built into the thermal sense circuit. after the device has cooled approximately 20 c, the switch turns back on. the switch continues to cycle off and on until the fault is removed. undervoltage lockout a voltage sense circuit monitors the input voltage. when the input voltage is below approximately 2 v, a control signal turns off the power switch.
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 4 post office box 655303 ? dallas, texas 75265 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) 2 input voltage range, v i(in) (see note 1) 0.3 v to 6 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output voltage range, v o(out) (see note 1) 0.3 v to v i(in) + 0.3 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . input voltage range, v i(en) 0.3 v to 6 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous output current, i o(out) internally limited . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . continuous total power dissipation see dissipation rating table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating virtual junction temperature range, t j 40 c to 125 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range, t stg 65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds 260 c . . . . . . . . . . . . . . . . . . . . . . . electrostatic discharge (esd) protection: human body model 2 kv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . machine model 200v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . charged device model (cdm) 750 v . . . . . . . . . . . . . . . . . . . . . . . . . 2 stresses beyond those listed under aabsolute maximum ratingso may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated under arecommended operating conditi onso is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. note 1: all voltages are with respect to gnd. dissipation rating table package 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 d 725 mw 5.8 mw/ c 464 mw 377 mw p 1175 mw 9.4 mw/ c 752 mw 611 mw recommended operating conditions min max unit in p ut voltage v i(in) 2.7 5.5 v inp u t v oltage v i(en ) 0 5.5 v tps2020 0 0.2 tps2021 0 0.6 continuous output current, i o tps2022 0 1 a tps2023 0 1.5 tps2024 0 2 operating virtual junction temperature, t j 40 125 c
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 5 post office box 655303 ? dallas, texas 75265 electrical characteristics over recommended operating junction temperature range, v i(in) = 5.5 v, i o = rated current, en = 0 v (unless otherwise noted) power switch parameter test conditions 2 min typ max unit v i(in) = 5 v, t j = 25 c, i o = 1.8 a 33 36 v i(in) = 5 v, t j = 85 c, i o = 1.8 a 38 46 v i(in) = 5 v, t j = 125 c, i o = 1.8 a 44 50 v i(in) = 3.3 v, t j = 25 c, i o = 1.8 a 37 41 v i(in) = 3.3 v, t j = 85 c, i o = 1.8 a 43 52 r ds(on) static drain-source on-state resistance v i(in) = 3.3 v, t j = 125 c, i o = 1.8 a 51 61 m w r ds( on ) static drain - source on - state resistance v i(in) = 5 v, t j = 25 c, i o = 0.18 a 30 34 m w v i(in) = 5 v, t j = 85 c, i o = 0.18 a 35 41 v i(in) = 5 v, t j = 125 c, i o = 0.18 a 39 47 v i(in) = 3.3 v, t j = 25 c, i o = 0.18 a 33 37 v i(in) = 3.3 v, t j = 85 c, i o = 0.18 a 39 46 v i(in) = 3.3 v, t j = 125 c, i o = 0.18 a 44 56 t rise time out p ut v i(in) = 5.5 v, c l = 1 m f, t j = 25 c, r l = 10 w 6.1 ms t r rise time , o u tp u t v i(in) = 2.7 v, c l = 1 m f, t j = 25 c, r l = 10 w 8.6 ms t f fall time out p ut v i(in) = 5.5 v, c l = 1 m f, t j = 25 c, r l = 10 w 3.4 ms t f fall time , o u tp u t v i(in) = 2.7 v, c l = 1 m f, t j = 25 c, r l = 10 w 3 ms 2 pulse-testing techniques maintain junction temperature close to ambient temperature; thermal effects must be taken into account separately. enable input ( en ) parameter test conditions min typ max unit v ih high-level input voltage 2.7 v v i(in) 5.5 v 2 v v il low-level in p ut voltage 4.5 v v i(in) 5.5 v 0.8 v v il low - level in ut voltage 2.7 v v i(in) 4.5 v 0.5 v i i input current en = 0 v or en = v i(in) 0.5 0.5 m a t on turnon time c l = 100 m f, r l = 10 w 20 ms t off turnoff time c l = 100 m f, r l = 10 w 40 ms current limit parameter test conditions 2 min typ max unit tps2020 0.22 0.3 0.4 t j = 25 c, v i = 5.5 v, tps2021 0.66 0.9 1.1 i os short-circuit output current t j = 25 c , v i = 5 . 5 v , out connected to gnd, tps2022 1.1 1.5 1.8 a device enable into short circuit tps2023 1.65 2.2 2.7 tps2024 2.2 3 3.8 2 pulse-testing techniques maintain junction temperature close to ambient temperature; thermal effects must be taken into account separately.
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 6 post office box 655303 ? dallas, texas 75265 electrical characteristics over recommended operating junction temperature range, v i(in) = 5.5 v, i o = rated current, en = 0 v (unless otherwise noted) (continued) supply current parameter test conditions min typ max unit su pp ly current low level out p ut no load on out t j = 25 c 0.3 1 m a s u ppl y c u rrent , lo w- le v el o u tp u t no load on out en = v i(in) 40 c t j 125 c 10 m a su pp ly current high level out p ut no load on out en 0v t j = 25 c 58 75 m a s u ppl y c u rrent , high - le v el o u tp u t no load on out en = 0 v 40 c t j 125 c 75 100 m a leakage current out connected to ground en = v i(in) 40 c t j 125 c 10 m a undervoltage lockout parameter test conditions min typ max unit low-level input voltage 2 2.5 v hysteresis t j = 25 c 100 mv overcurrent (oc ) parameter test conditions min typ max unit output low voltage i o = 10 ma, v ol(oc ) 0.4 v off-state current 2 v o = 5 v, v o = 3.3 v 1 m a 2 specified by design, not production tested.
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 7 post office box 655303 ? dallas, texas 75265 parameter measurement information rl cl out t r t f 90% 90% 10% 10% 50% 50% 90% 10% v o(out) v i(en) v o(out) voltage waveforms test circuit t on t off figure 1. test circuit and voltage waveforms table of timing diagrams figure turnon delay and rise time 2 turnoff delay and fall time 3 turnon delay and rise time with 1- m f load 4 turnoff delay and rise time with 1- m f load 5 device enabled into short 6 tps2020, tps2021, tps2022, tps2023, and tps2024, ramped load on enabled device 7, 8, 9, 10, 11 tps2024, inrush current 12 7.9- w load connected to an enabled tps2020 device 13 3.7- w load connected to an enabled tps2020 device 14 3.7- w load connected to an enabled tps2021 device 15 2.6- w load connected to an enabled tps2021 device 16 2.6- w load connected to an enabled tps2022 device 17 1.2- w load connected to an enabled tps2022 device 18 1.2- w load connected to an enabled tps2023 device 19 0.9- w load connected to an enabled tps2023 device 20 0.9- w load connected to an enabled tps2024 device 21 0.5- w load connected to an enabled tps2024 device 22
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 8 post office box 655303 ? dallas, texas 75265 parameter measurement information figure 2. turnon delay and rise time 2 468101214161820 t time ms 0 v in = 5 v r l = 27 w t a = 25 c v o(out) (2 v/div) v i(en) v o(out) v i(en) (5 v/div) figure 3. turnoff delay and fall time 2 4 6 8 10 12 14 16 18 20 t time ms v i(en) (5 v/div) 0 v i(in) = 5 v r l = 27 w t a = 25 c v o(out) (2 v/div) v i(en) v o(out) figure 4. turnon delay and rise time with 1- m f load 2 4 6 81012141618 20 t time ms v i(en) (5 v/div) 0 v i(in) = 5 v c l = 1 m f r l = 27 w t a = 25 c v o(out) (2 v/div) v i(en) v o(out) figure 5. turnoff delay and fall time with 1- m f load 2 468101214161820 t time ms v i(en) (5 v/div) 0 v i(in) = 5 v c l = 1 m f r l = 27 w t a = 25 c v o(out) (2 v/div) v i(en) v o(out)
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 9 post office box 655303 ? dallas, texas 75265 parameter measurement information figure 6. device enabled into short 1 2345678910 t time ms v i(en) (5 v/div) 0 i o(out) (1 a/div) v i(en) i o(out) v i(in) = 5 v t a = 25 c tps2024 tps2023 tps2022 tps2021 tps2020 figure 7. tps2020, ramped load on enabled device 20 40 60 80 100 120 140 160 180 200 t time ms v o(oc) (5 v/div) 0 i o(out) (500 ma/div) v o(oc) i o(out) v i(in) = 5 v t a = 25 c figure 8. tps2021, ramped load on enabled device 20 40 60 80 100 120 140 160 180 200 t time ms v o(oc) (5 v/div) 0 i o(out) (1 a/div) v o(oc) i o(out) v i(in) = 5 v t a = 25 c figure 9. tps2022, ramped load on enabled device 20 40 60 80 100 120 140 160 180 200 t time ms v o(oc) (5 v/div) 0 i o(out) (1 a/div) v o(oc) i o(out) v i(in) = 5 v t a = 25 c
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 10 post office box 655303 ? dallas, texas 75265 parameter measurement information figure 10. tps2023, ramped load on enabled device 20 40 60 80 100 120 140 160 180 200 t time ms v o(oc) (5 v/div) 0 i o(out) (1 a/div) v o(oc) i o(out) v i(in) = 5 v t a = 25 c figure 11. tps2024, ramped load on enabled device 20 40 60 80 100 120 140 160 180 200 t time ms v o(oc) (5 v/div) 0 i o(out) (1 a/div) v o(oc) i o(out) v i(in) = 5 v t a = 25 c figure 12. tps2024, inrush current 12 3 45 67 8 910 t time ms 0 i i(in) (500 ma/div) v i(en) i i(in) r l = 10 w t a = 25 c v i(en) (5 v/div) 470 m f 47 m f 150 m f figure 13. 7.9- w load connected to an enabled tps2020 device 200 400 600 800 1000 1200 1400 1600 1800 200 0 t time m s v o(oc) (5 v/div) 0 i o(out) (200 ma/div) v o(oc) i o(out) v i(in) = 5 v r l = 7.9 w t a = 25 c
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 11 post office box 655303 ? dallas, texas 75265 parameter measurement information figure 14. 3.7- w load connected to an enabled tps2020 device 50 100 150 200 250 300 350 400 450 500 t time m s v o(oc) (5 v/div) 0 i o(out) (500 ma/div) v o(oc) i o(out) v i(in) = 5 v r l = 3.7 w t a = 25 c figure 15. 3.7- w load connected to an enabled tps2021 device 200 400 600 800 1000 1200 1400 1600 1800 2000 t time m s v o(oc) (5 v/div) 0 i o(out) (1 a/div) v o(oc) i o(out) v i(in) = 5 v r l = 3.7 w t a = 25 c figure 16. 2.6- w load connected to an enabled tps2021 device 50 100 150 200 250 300 350 400 450 500 t time m s v o(oc) (5 v/div) 0 i o(out) (1 a/div) v o(oc) i o(out) v i(in) = 5 v r l = 2.6 w t a = 25 c figure 17. 2.6- w load connected to an enabled tps2022 device 200 400 600 800 1000 1200 1400 1600 1800 2000 t time m s v o(oc) (5 v/div) 0 i o(out) (1 a/div) v o(oc) i o(out) v i(in) = 5 v r l = 2.6 w t a = 25 c
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 12 post office box 655303 ? dallas, texas 75265 parameter measurement information figure 18. 1.2- w load connected to an enabled tps2022 device 100 200 300 400 500 600 700 800 900 1000 t time m s v o(oc) (5 v/div) 0 i o(out) (1 a/div) v o(oc) i o(out) v i(in) = 5 v r l = 1.2 w t a = 25 c figure 19. 1.2- w load connected to an enabled tps2023 device 100 200 300 400 500 600 700 800 900 1000 t time m s v o(oc) (5 v/div) 0 i o(out) (2 a/div) v o(oc) i o(out) v i(in) = 5 v r l = 1.2 w t a = 25 c figure 20. 0.9- w load connected to an enabled tps2023 device 100 200 300 400 500 600 700 800 900 1000 t time m s v o(oc) (5 v/div) 0 i o(out) (2 a/div) v o(oc) i o(out) v i(in) = 5 v r l = 0.9 w t a = 25 c figure 21. 0.9- w load connected to an enabled tps2024 device 100 200 300 400 500 600 700 800 900 1000 t time m s v o(oc) (5 v/div) 0 i o(out) (5 a/div) v o(oc) i o(out) v i(in) = 5 v r l = 0.9 w t a = 25 c
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 13 post office box 655303 ? dallas, texas 75265 parameter measurement information figure 22. 0.5- w load connected to an enabled tps2024 device 50 100 150 200 250 300 350 400 450 500 t time m s v o(oc) (5 v/div) 0 i o(out) (5 a/div) v o(oc) i o(out) v i(in) = 5 v r l = 0.5 w t a = 25 c typical characteristics table of graphs figure t d(on) turnon delay time vs output voltage 23 t d(off) turnoff delay time vs input voltage 24 t r rise time vs load current 25 t f fall time vs load current 26 supply current (enabled) vs junction temperature 27 supply current (disabled) vs junction temperature 28 supply current (enabled) vs input voltage 29 supply current (disabled) vs input voltage 30 i os short circuit current limit vs input voltage 31 i os short - circ u it c u rrent limit vs junction temperature 32 vs input voltage 33 r ds( ) static drain source on state resistance vs junction temperature 34 r ds(on) static drain - so u rce on - state resistance vs input voltage 35 vs junction temperature 36 v i input voltage undervoltage lockout 37
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 14 post office box 655303 ? dallas, texas 75265 typical characteristics figure 23 4.5 4 3.5 2.5 3 3.5 4 4.5 turn-on delay time ms 5 5.5 turnon delay time vs output voltage 7.5 5 5.5 6 v i input voltage v t d(on) 6 6.5 7 t a = 25 c c l = 1 m f figure 24 17 16.5 16 2.5 3 3.5 4 4.5 17.5 turnoff delay time vs input voltage 18 5 5.5 6 v i input voltage v turn-off delay time ms t d(off) t a = 25 c c l = 1 m f figure 25 5.5 5 0 0.5 1 rise time ms 6 rise time vs load current 6.5 1.5 2 i l load current a t r t a = 25 c c l = 1 m f figure 26 3.25 2.75 2.5 0 0.5 fall time ms 3.5 fall time vs load current 1 1.5 2 3 i l load current a t f t a = 25 c c l = 1 m f
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 15 post office box 655303 ? dallas, texas 75265 typical characteristics figure 27 55 45 35 50 25 0 25 50 65 supply current (enabled) vs junction temperature 75 75 100 150 t j junction temperature c supply current (enabled) a m 125 v i(in) = 3.3 v v i(in) = 4 v v i(in) = 5 v v i(in) = 5.5 v v i(in) = 2.7 v figure 28 1 0 1 50 25 0 25 50 4 supply current (disabled) vs junction temperature 5 75 100 150 t j junction temperature c supply current (disabled) a m 125 3 2 v i(in) = 4 v v i(in) = 2.7 v v i(in) = 5 v v i(in) = 5.5 v v i(in) = 3.3 v figure 29 55 45 35 2.5 3 3.5 4 4.5 65 supply current (enabled) vs input voltage 75 5 5.5 6 v i input voltage v supply current (enabled) a m t j = 125 c t j = 85 c t j = 25 c t j = 0 c t j = 40 c figure 30 1 0 1 2.5 3 3.5 4 4.5 4 supply current (disabled) vs input voltage 5 5 5.5 6 v i input voltage v supply current (disabled) a m 3 2 t j = 85 c t j = 0 c t j = 40 c t j = 125 c t j = 25 c
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 16 post office box 655303 ? dallas, texas 75265 typical characteristics short-circuit current limit vs input voltage figure 31 1.5 0.5 0 23 4 2.5 3.5 56 v i input voltage v short-circuit current limit a i os 1 2 3 tps2023 tps2022 tps2021 tps2020 tps2024 t a = 25 c figure 32 short-circuit current limit vs junction temperature 1.5 0.5 0 50 25 0 2.5 3.5 25 100 t j junction temperature c short-circuit current limit a i os 1 2 3 tps2023 tps2022 tps2021 tps2020 tps2024 50 75 figure 33 static drain-source on-state resistance vs input voltage 20 2.5 3 3.5 40 60 46 v i input voltage v 30 50 4.5 5 w r ds(on) static drain-source on-state resistance m 5.5 t j = 25 c t j = 125 c t j = 40 c i o = 0.18 a figure 34 static drain-source on-state resistance vs junction temperature 20 50 25 0 40 60 25 150 t j junction temperature c 30 50 v i = 2.7 v 50 75 100 125 v i = 3.3 v v i = 5.5 v i o = 0.18 a w r ds(on) static drain-source on-state resistance m
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 17 post office box 655303 ? dallas, texas 75265 typical characteristics static drain-source on-state resistance vs input voltage 20 3 3.5 40 60 46 v i input voltage v 30 50 4.5 5 5.5 t j = 25 c t j = 125 c figure 35 i o = 1.8 a t j = 40 c w r ds(on) static drain-source on-state resistance m figure 36 static drain-source on-state resistance vs junction temperature 20 50 25 0 40 60 25 150 t j junction temperature c 30 50 v i = 3.3 v 50 75 100 125 v i = 4 v v i = 5.5 v i o = 1.8 a w r ds(on) static drain-source on-state resistance m figure 37 2 50 0 50 100 2.4 undervoltage lockout 2.5 150 t j temperature c 2.3 2.2 start threshold stop threshold 2.1 v i input voltage v
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 18 post office box 655303 ? dallas, texas 75265 application information in oc en gnd 0.1 m f 2,3 5 4 6,7,8 0.1 m f 22 m f load 1 out tps2024 power supply 2.7 v to 5.5 v 10 k w figure 38. typical application power-supply considerations a 0.01- m f to 0.1- m f ceramic bypass capacitor between in and gnd, close to the device, is recommended. placing a high-value electrolytic capacitor on the output and input pins is recommended when the output load is heavy. this precaution reduces power supply transients that may cause ringing on the input. additionally, bypassing the output with a 0.01- m f to 0.1- m f ceramic capacitor improves the immunity of the device to short-circuit transients. overcurrent a sense fet checks for overcurrent conditions. unlike current-sense resistors, sense fets do not increase the series resistance of the current path. when an overcurrent condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. complete shutdown occurs only if the fault is present long enough to activate thermal limiting. three possible overload conditions can occur. in the first condition, the output has been shorted before the device is enabled or before v i(in) has been applied (see figure 6). the tps202x senses the short and immediately switches into a constant-current output. in the second condition, the excessive load occurs while the device is enabled. at the instant the excessive load occurs, very high currents may flow for a short time before the current-limit circuit can react (see figures 1322). after the current-limit circuit has tripped (reached the overcurrent trip threshhold) the device switches into constant-current mode. in the third condition, the load has been gradually increased beyond the recommended operating current. the current is permitted to rise until the current-limit threshold is reached or until the thermal limit of the device is exceeded (see figures 711). the tps202x is capable of delivering current up to the current-limit threshold without damaging the device. once the threshold has been reached, the device switches into its constant-current mode. oc response the oc open-drain output is asserted (active low) when an overcurrent or overtemperature condition is encountered. the output will remain asserted until the overcurrent or overtemperature condition is removed. connecting a heavy capacitive load to an enabled device can cause momentary false overcurrent reporting from the inrush current flowing through the device, charging the downstream capacitor. an rc filter can be connected to the oc pin to reduce false overcurrent reporting. using low-esr electrolytic capacitors on the output lowers the inrush current flow through the device during hot-plug events by providing a low impedance energy source, thereby reducing erroneous overcurrent reporting.
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 19 post office box 655303 ? dallas, texas 75265 application information gnd in in en out oc out out tps202x gnd in in en out oc out out tps202x r pullup v+ r filter r pullup c filter v+ figure 39. typical circuit for oc pin and rc filter for damping inrush oc responses power dissipation and junction temperature the low on-resistance on the n-channel mosfet allows small surface-mount packages, such as soic, to pass large currents. the thermal resistances of these packages are high compared to those of power packages; it is good design practice to check power dissipation and junction temperature. the first step is to find r ds(on) at the input voltage and operating temperature. as an initial estimate, use the highest operating ambient temperature of interest and read r ds(on) from figures 3336. next, calculate the power dissipation using: p d r ds ( on ) i 2 finally, calculate the junction temperature: t j p d r ja t a where: t a = ambient temperature c r q ja = thermal resistance soic = 172 c/w, pdip = 106 c/w compare the calculated junction temperature with the initial estimate. if they do not agree within a few degrees, repeat the calculation, using the calculated value as the new estimate. two or three iterations are generally sufficient to get an acceptable answer. thermal protection thermal protection prevents damage to the ic when heavy-overload or short-circuit faults are present for extended periods of time. the faults force the tps202x into constant current mode, which causes the voltage across the high-side switch to increase; under short-circuit conditions, the voltage across the switch is equal to the input voltage. the increased dissipation causes the junction temperature to rise to high levels. the protection circuit senses the junction temperature of the switch and shuts it off. hysteresis is built into the thermal sense circuit, and after the device has cooled approximately 20 degrees, the switch turns back on. the switch continues to cycle in this manner until the load fault or input power is removed. undervoltage lockout (uvlo) an undervoltage lockout ensures that the power switch is in the off state at powerup. whenever the input voltage falls below approximately 2 v, the power switch will be quickly turned off. this facilitates the design of hot-insertion systems where it is not possible to turn off the power switch before input power is removed. the uvlo will also keep the switch from being turned on until the power supply has reached at least 2 v, even if the switch is enabled. upon reinsertion, the power switch will be turned on, with a controlled rise time to reduce emi and voltage overshoots.
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 20 post office box 655303 ? dallas, texas 75265 application information generic hot-plug applications (see figure 40) in many applications it may be necessary to remove modules or pc boards while the main unit is still operating. these are considered hot-plug applications. such implementations require the control of current surges seen by the main power supply and the card being inserted. the most effective way to control these surges is to limit and slowly ramp the current and voltage being applied to the card, similar to the way in which a power supply normally turns on. because of the controlled rise times and fall times of the tps202x series, these devices can be used to provide a softer start-up to devices being hot-plugged into a powered system. the uvlo feature of the tps202x also ensures the switch will be off after the card has been removed, and the switch will be off during the next insertion. the uvlo feature guarantees a soft start with a controlled rise time for every insertion of the card or module. power supply block of circuitry tps2024 gnd in in en out out out oc 0.1 m f 1000 m f optimum 2.7 v to 5.5 v pc board overcurrent response figure 40. typical hot-plug implementation by placing the tps202x between the v cc input and the rest of the circuitry, the input power will reach this device first after insertion. the typical rise time of the switch is approximately 9 ms, providing a slow voltage ramp at the output of the device. this implementation controls system surge currents and provides a hot-plugging mechanism for any device.
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 21 post office box 655303 ? dallas, texas 75265 mechanical data d (r-pdso-g**) plastic small-outline package 14 pin shown 4040047 / d 10/96 0.228 (5,80) 0.244 (6,20) 0.069 (1,75) max 0.010 (0,25) 0.004 (0,10) 1 14 0.014 (0,35) 0.020 (0,51) a 0.157 (4,00) 0.150 (3,81) 7 8 0.044 (1,12) 0.016 (0,40) seating plane 0.010 (0,25) pins ** 0.008 (0,20) nom a min a max dim gage plane 0.189 (4,80) (5,00) 0.197 8 (8,55) (8,75) 0.337 14 0.344 (9,80) 16 0.394 (10,00) 0.386 0.004 (0,10) m 0.010 (0,25) 0.050 (1,27) 0 8 notes: a. all linear dimensions are in inches (millimeters). b. this drawing is subject to change without notice. c. body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15). d. falls within jedec ms-012
tps2020, tps2021, tps2022, tps2023, tps2024 power-distribution switches slvs175a december 1998 revised november 1999 22 post office box 655303 ? dallas, texas 75265 mechanical data p (r-pdip-t8) plastic dual-in-line package 4040082 / b 03/95 0.310 (7,87) 0.290 (7,37) 0.010 (0,25) nom 0.400 (10,60) 0.355 (9,02) 5 8 4 1 0.020 (0,51) min 0.070 (1,78) max 0.240 (6,10) 0.260 (6,60) 0.200 (5,08) max 0.125 (3,18) min 0.015 (0,38) 0.021 (0,53) seating plane m 0.010 (0,25) 0.100 (2,54) 0 15 notes: a. all linear dimensions are in inches (millimeters). b. this drawing is subject to change without notice. c. falls within jedec ms-001
important notice texas instruments and its subsidiaries (ti) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. ti warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ti's standard warranty. testing and other quality control techniques are utilized to the extent ti deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage (acritical applicationso). ti semiconductor products are not designed, authorized, or warranted to be suitable for use in life-support devices or systems or other critical applications. inclusion of ti products in such applications is understood to be fully at the customer's risk. in order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. ti assumes no liability for applications assistance or customer product design. ti does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ti covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. ti's publication of information regarding any third party's products or services does not constitute ti's approval, warranty or endorsement thereof. copyright ? 1999, texas instruments incorporated

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