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tps2421-1 tps2421-2 www.ti.com slus907d ? january 2009 ? revised august 2010 3-v to 20-v integrated fet hot swap check for samples: tps2421-1 , tps2421-2 1 features description 2 ? integrated pass mosfet ? 3.3-v to 20-v bus operation the tps2421 provides highly integrated hot swap power management and superior protection in ? programmable fault current applications where the load is powered by voltages ? current limit proportionally larger than fault between 3.0 v and 20 v. these devices are very current effective in systems where a voltage bus must be ? programmable fault timer protected to prevent shorts from interrupting or damaging the unit. the tps2421 is an easy to use ? internal mosfet power limiting devices in an 8-pin powerpad ? so-8 package. ? latch-off on fault (-1) and retry (-2) versions the tps2421 has multiple programmable protection ? so-8 powerpad ? package features. load protection is accomplished by a ? ? 40 c to 125 c junction temperature range non-current limiting fault threshold, a hard current ? ul listed - file number e169910 limit, and a fault timer. the current dual thresholds allow the system to draw short high current pulses, while the fault timer is running, without causing a applications voltage droop at the load. an example of this is a disk ? raid arrays drive startup. this technique is ideal for loads that ? telecommunications experience brief high demand, but benefit from ? plug-in circuit boards protection levels in-line with their average current draw. ? disk drive hotswap mosfet protection is provided by power limit circuitry which protects the internal mosfet against soa related failures. the tps2421 is available in latch-off on fault (-1) and retry on fault (-2). figure 1. typical application note (a) required only in systems with lead and/or load inductance. 1 please be aware that an important notice concerning availability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 powerpad is a trademark of texas instruments. production data information is current as of publication date. copyright ? 2009 ? 2010, texas instruments incorporated products conform to specifications per the terms of the texas instruments standard warranty. production processing does not necessarily include testing of all parameters. ct vout vin en flt pg iset gnd r set (a) c out (a) (a) c vin c ct optional: to system monitor 3 7 2 4 5 6 1 8 3 v to 20 v in out
tps2421-1 tps2421-2 slus907d ? january 2009 ? revised august 2010 www.ti.com product information (1) device feature package marking tps2421-1 latchoff 2421-1 dda (so8 powerpad ? ) tps2421-2 auto-retry 2421-2 (1) for the most current package and ordering information, see the package option addendum at the end of this document, or visit the device product folder on www.ti.com . absolute maximum ratings over operating free-air temperature range (unless otherwise noted) (1) (2) value unit v in , v out input voltage range ? 0.3 to 25 flt, pg voltage range ? 0.3 to 20 v i set , c t voltage 1.75 i max maximum continuous output current 9 a flt, pg output sink current 10 ma en input voltage range ? 0.3 to 6 v ct, (3) iset (3) voltage range -0.3 to 3 esd rating, hbm 2.5 kv esd rating, cdm 400 v t j operating junction temperature range internally limited c t stg storage temperature range ? 65 to 150 (1) 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. (2) all voltage values are with respect to gnd. (3) do not apply voltage to these pins. dissipation ratings (1) package q ja q ja q ja low k, c/w high k, c/w best (2) , c/w dda 190 (3) 45 (4) 45 (1) tested per jedec jesd51, natural convection. the definitions of high-k and low-k are per jesd 51-7 and jesd 51-3. (2) the best case thermal resistance is obtained using the recommendations per slma002a (2 signal ? 2 plane with the pad connected to the plane). (3) low-k (2 signal ? no plane, 3 in. by 3 in. board, 0.062 in. thick, 1 oz. copper) test board with the pad soldered, and an additional 0.12 in.2 of top-side copper added to the pad. (4) high-k is a (2 signal ? 2 plane) test board with the pad soldered. recommended operating conditions min nom max unit v in , v out input voltage range 3 20 en voltage range 0 5 v flt, pg voltage range 0 20 i out continuous output current 0 6 a flt, pg output sink current 0 1 ma c ct 100 10 pf/ m f junction temperature ? 40 125 c 2 submit documentation feedback copyright ? 2009 ? 2010, texas instruments incorporated product folder link(s): tps2421-1 tps2421-2
tps2421-1 tps2421-2 www.ti.com slus907d ? january 2009 ? revised august 2010 electrical characteristics unless otherwise noted: 3 v v in 18 v, en = 0 v, pg = flt = open, r out = open, c load = 0, r set = 49.9 k ? , ? 40 c t j 125 c parameter test conditions min typ max unit vin uvlo vin rising 2.6 2.85 2.9 v hysteresis 150 mv bias current en = 2.4v 25 100 m a en = 0v 3.9 5 ma vin, vout r vin-vout , i vout < i rmax or r on 33 50 m ? i vout < (i set 1.25), 1 a i vout 4.5 a power limit tps242x v in : 12 v, c out = 1000 m f en: 3 v 0 v 3 5 7.5 v reverse diode v out > v in , en = 5 v, i in = ? 1 a 0.77 1.0 voltage iset i vout , i ct : sinking sourcing, pulsed test r rset = 200 k ? 0.80 1.2 0 c t j 85 c r rset = 100 k ? 1.80 2.2 fault current i set r rset = 49.9 k ? 3.60 4.40 a threshold r rset = 200 k ? 0.75 1.25 -40 c t j 125 c r rset = 100 k ? 1.75 2.25 r rset = 49.9 k ? 3.60 4.40 r rset = 200 k ? 1.1 1.8 2.6 i lim / ratio i lim / i flt r rset = 100 k ? 1.1 1.5 2.1 i flt ? r rset = 49.9 k ? 1.1 1.4 1.6 r rset = 200 k ? 1.1 1.8 2.4 i lim current limit i vout rising, v vin-vout = 0.3 v, pulsed test r rset = 100 k ? 2.3 3.0 3.7 r rset = 49.9 k ? 4.6 5.5 6.3 ct i ct sourcing, v ct = 1 v, in current limit 29 35 41 charge/discharge m a current i ct sinking, v ct = 1 v, drive ct to 1 v, measure current 1.0 1.4 1.8 v ct rising 1.3 1.4 1.5 threshold voltage v v ct falling, drive ct to 1 v, measure current 0.1 0.16 0.3 on/off fault duty v vout = 0 v 2.8% 3.7% 4.6% cycle copyright ? 2009 ? 2010, texas instruments incorporated submit documentation feedback 3 product folder link(s): tps2421-1 tps2421-2
tps2421-1 tps2421-2 slus907d ? january 2009 ? revised august 2010 www.ti.com electrical characteristics (continued) unless otherwise noted: 3 v v in 18 v, en = 0 v, pg = flt = open, r out = open, c load = 0, r set = 49.9 k ? , ? 40 c t j 125 c parameter test conditions min typ max unit en v en falling 0.8 1.0 1.5 v threshold voltage hysteresis 20 150 250 mv ven = 2.4 v ? 2.0 0 0.5 input bias current m a ven = 0.2 v ? 3.0 1 0.5 turn on propagation v in = 3.3 v, i load = 1 a, v en : 2.4 v 0.2 v, 350 500 delay v out : rising 90% v in m s turn off propagation v in = 3.3 v, i load = 1 a, v en : 0.2 v 2.4 v, 30 50 delay v out : 10% v in flt low level output v ol v ct = 1.8 v, i flt = 1 ma 0.2 0.4 v voltage leakage current v flt = 18 v 1 m a pg v (vin-vout) falling 0.4 0.5 0.75 pg threshold hysteresis 0.1 0.25 0.4 v low level output v ol i pg = 1 ma 0.2 0.4 voltage leakage current v pg = 18 v 1 m a thermal shutdown thermal shutdown junction temperature rising 160 c hysteresis 10 4 submit documentation feedback copyright ? 2009 ? 2010, texas instruments incorporated product folder link(s): tps2421-1 tps2421-2
tps2421-1 tps2421-2 www.ti.com slus907d ? january 2009 ? revised august 2010 block diagram pinout diagram copyright ? 2009 ? 2010, texas instruments incorporated submit documentation feedback 5 product folder link(s): tps2421-1 tps2421-2 en vin gnd iset vout pg ct tps2421-x 1 2 3 flt 4 5 6 7 8 vout 7 thermal shutdown 3 vin 1.0v 5 iset + i(d)detector + 4 gnd i out 1 flt v in -500mv + v out 6 ct 0.8r 0.2r r i out ______ 200 k w 1.35 v 34 m a 1.25 m a ct charge + 200 mv + 2 en + 1.5v internal rail + 2.7 / 2.6 pwrg pwrg s q q r 33 m a + flt latch -1 retry -2 factory set vin 8 pg 10 m a q pump + constant power engine s + - v(ds) detector lca fast trip 1.6 x i lim +
tps2421-1 tps2421-2 slus907d ? january 2009 ? revised august 2010 www.ti.com table 1. terminal functions function pin no. description flt 1 fault low indicated the fault time has expired and the fet is switched off en 2 device is enabled when this pin is pulled low vin 3 power in and control supply voltage gnd 4 gnd iset 5 a resistor to ground sets the fault current, the current limit is 125% of the fault current. tps2421 only ct 6 a capacitor to ground sets the fault time vout 7 output to the load pg 8 power good low represents the output voltage is within 300 mv of the input voltage pin description ct: connect a capacitor form ct to gnd to set the fault time. the fault timer starts when the fault current threshold is exceeded, charging the capacitor with 36 m a from gnd towards an upper threshold of 1.4 v. if the capacitor reaches the upper threshold, the internal pass mosfet is turned off. the mosfet will stay off until en is cycled if a latching version is used. if an auto-retry version is used, the capacitor will discharge at 5 m a to 0.2 v and then re-enable the pass mosfet. when the device is disabled, ct is pulled to gnd through a 100-k ? resistor. the timer period must be chosen long enough to allow the external load capacitance to charge. the fault timer period is selected using equation 1 where t fault is the minimum timer period in seconds and c ct is in farads. (1) this equation does not account for component tolerances. in autoretry versions, the second and subsequent retry timer periods will be approximately 85% as long as the first retry period. in autoretry versions, the fault timer discharges the capacitor for a nominal t sd in seconds with c ct in farads per equation 2 . (2) the nominal ratio of on to off times represents about a 3% duty cycle when a hard fault is present on the output of an autoretry version part. flt: open-drain output that pulls low on any condition that causes the output to open. these conditions are either an overload with a fault time-out, or a thermal shutdown. flt becomes operational before uv, when v in is greater than 1 v. gnd: this is the most negative voltage in the circuit and is used as reference for all voltage measurements unless otherwise specified. iset: a resistor from this pin to gnd sets both the fault current (i fault ) and current limit (i max ) levels. the current limit is internally set at 125% of the fault current. the fault timer function on c t starts charging c t if i vin exceeds the programmed fault current. if this current continues long enough for v ct to reach its upper trip threshold, the output is turned off. if i vin falls below the fault current threshold before c t reaches its upper threshold, c t is discharged and normal operation continues. the internal mosfet actively limits current if i vin reaches the current limit set point. the fault timer operation is the same in this mode as described previously. the fault current value is programmed as follows; (3) 6 submit documentation feedback copyright ? 2009 ? 2010, texas instruments incorporated product folder link(s): tps2421-1 tps2421-2 3 38 9 10 fault ct t c . = 6 1 0 10 sd ct t . c = fault iflt i k r w = 200
tps2421-1 tps2421-2 www.ti.com slus907d ? january 2009 ? revised august 2010 en: when this pin is pulled low, the device is enabled. the input threshold is hysteretic, allowing the user to program a startup delay with an external rc circuit. en is pulled to v in by a 10-m ? resistor, pulled to gnd by 16.8 m ? and is clamped to ground by a 7-v zener diode. because high impedance pullup/down resistors are used to reduce current draw, any external fet controlling this pin should be low leakage. if en is tied to gnd at startup and v in does not ramp quickly the tps2421 may momentarily turn off then on during startup. this can happen if a capacitive load momentarily pulls down the input voltage below the uv threshold. if necessary, this can be avoided by delaying en assertion until v in is fully up. v in : input voltage to the tps2421. the recommended operating voltage range is 3 v to 20 v. all vin pins should be connected together and to the power source. v out : output connection for the tps2421. when switched on the output voltage will be approximately: (4) all v out pins should be connected together and to the load. pg: active low, open drain output, power good indicates that there is no fault condition and the output voltage is within 0.5 v of the input voltage. pg becomes operational before uv, whenever v in is greater than 1 v. copyright ? 2009 ? 2010, texas instruments incorporated submit documentation feedback 7 product folder link(s): tps2421-1 tps2421-2 0 04 out in out v v . i = -
tps2421-1 tps2421-2 slus907d ? january 2009 ? revised august 2010 www.ti.com typical characteristics figure 2. figure 3. figure 4. figure 5. 8 submit documentation feedback copyright ? 2009 ? 2010, texas instruments incorporated product folder link(s): tps2421-1 tps2421-2 10 12 16 18 22 24 i supply C supply current C ma supply current vs junction temperature 2014 t j C junction temperature C c sleep mode C 50 0 100 150 50 1.30 1.35 1.50 v thresh C fault timer threshold voltage -C v fault timer threshold voltage vs junction temperature 1.451.40 t j C junction temperature C c C 50 0 100 150 50 C 50 100 3.0 3.5 5.0 6.5 7.5 8.0 p limit C power limit level C w power limit vs junction temperature 0 50 150 4.0 5.5 7.0 t j C junction temperature C c 4.5 6.0 i load = 1 a C 50 0 50 150 fault current vs junction temperature 100 i fault C fault current C a 1.80 2.00 2.10 2.201.90 1.85 2.50 2.151.95 r flt = 100 kw t j C junction temperature C c
tps2421-1 tps2421-2 www.ti.com slus907d ? january 2009 ? revised august 2010 typical characteristics (continued) figure 6. 12-v startup into 15 ? , 700 m f load figure 7. 12-v, 140 m f added to 8 ? load figure 8. 12-v faulted startup into 4 ? load figure 9. 12-v soft overload, 3 a to 4.2 a, power limit not tripped copyright ? 2009 ? 2010, texas instruments incorporated submit documentation feedback 9 product folder link(s): tps2421-1 tps2421-2 r set = 49.9 k w temp capacitive overload, power limit tripped 12-v load at 1.5 a, then 140 m f added to load iload vout vct pg r set = 49.9 k w 12 v startup into 15 w , 700 m f load iload vout pg en 12-v failed startup in 4 w, 0 m f load vout vin flt en soft overload, power limit not tripped, 12-v load stepped from 3 a to 4.2 a, c load = 700 m f, r set = 49.9 k w iload vout vct pg
tps2421-1 tps2421-2 slus907d ? january 2009 ? revised august 2010 www.ti.com typical characteristics (continued) figure 10. 12-v firm overload, 3 a to 5.4 a, power limit figure 11. 12-v hard overload, 3.6-a load then short tripped figure 12. power dissipation during 12-v startup into 60 figure 13. power dissipation during 12-v startup into 15 ? , 800 m f ? , 140 m f 10 submit documentation feedback copyright ? 2009 ? 2010, texas instruments incorporated product folder link(s): tps2421-1 tps2421-2 r set = 49.9 k w 12-v p lim during startup into 60 w , 800 m f p dissipation internal fet iload vout 12-v load at 3.6 a, then short applied to output, r set = 49.9 k w iload vout vct pg overload, power limit tripped, 12-v load stepped from 3 a to 5.4 a, c load = 700 m f, r set = 49.9 k w iload vout vct pg r set = 49.9 k w 12-v p lim during startup into overload, ct = 0.1 m f p dissipation internal fet iload vout ct r flt = 100 k
tps2421-1 tps2421-2 www.ti.com slus907d ? january 2009 ? revised august 2010 typical characteristics (continued) figure 14. 3-v startup into 1- ? load figure 15. 3-v firm overload, load stepped from 3.8 a to 5.5 a figure 16. 3-v hard overload, load stepped from 3.8 a to figure 17. 3-v output shorted while under 3.5-a load 7.1 a copyright ? 2009 ? 2010, texas instruments incorporated submit documentation feedback 11 product folder link(s): tps2421-1 tps2421-2 3.3 v overload step from 3.8 a to 7.1 a, r set = 49.9 k w iload vout vct pg r set = 49.9 k w 3 v startup into 3.2 a load iload vout pg en 3.3 v overload shorted while under 3.5 a load, r set = 49.9 k w iload vout vct flt 3.3 v overload step from 3.8 a to 5.5 a, r set = 49.9 k w iload vout vct pg
tps2421-1 tps2421-2 slus907d ? january 2009 ? revised august 2010 www.ti.com typical characteristics (continued) figure 18. 3 v, 1600 m f added to 3.5-a load figure 19. 3-v retry startup into 1 ? , 2200- m f load figure 20. startup into a short circuit output 12 submit documentation feedback copyright ? 2009 ? 2010, texas instruments incorporated product folder link(s): tps2421-1 tps2421-2 3.3 v attempting startup into 1 w, 2200 m f load, retry mode - ct = 0.1 m f r set = 49.9 k w iload vout vct en 3.3 v, 1600 m f added while under 3.5 a load, r set = 49.9 k w iload vout vct pg
tps2421-1 tps2421-2 www.ti.com slus907d ? january 2009 ? revised august 2010 application information maximum load at startup the power limiting function of the tps2421 provides very effective protection for the internal fet. expectedly, there is a supply voltage dependent maximum load which the device will be able to power up. loads above this level may cause the device to shut off current before startup is complete. neglecting any load capacitance, the maximum load ( minimum load resistance ) is calculated using the equation; (5) adding load capacitance may reduce the maximum load which can be present at start up. if en is tied to gnd at startup and v in does not ramp quickly the tps2421 may momentarily turn off then on during startup. this can happen if a capacitive load momentarily pulls down the input voltage below the uv threshold. if necessary, this can be avoided by delaying en assertion until v in is fully up. transient protection the need for transient protection in conjunction with hot-swap controllers should always be considered. when the tps2421 interrupts current flow, input inductance generates a positive voltage spike on the input and output inductance generates a negative voltage spike on the output. such transients can easily exceed twice the supply voltage if steps are not taken to address the issue. typical methods for addressing transients include; ? minimizing lead length/inductance into and out of the device ? voltage suppressors (tvs) on the input to absorb inductive spikes ? shottky diode across the output to absorb negative spikes ? a combination of ceramic and electrolytic capacitors on the input and output to absorb energy ? use pcb gnd planes the following equation estimates the magnitude of these voltage spikes: where ? v nom is the nominal supply voltage ? i load is the load current ? c is the capacitance present at the input or output of the tps2421 ? l equals the effective inductance seen looking into the source or the load (6) calculating the inductance due to a straight length of wire is shown in equation 7 . where ? l is the length of the wire ? d is diameter of the wire (7) some applications may require the addition of a tvs to prevent transients from exceeding the absolute ratings if sufficient capacitance cannot be included. copyright ? 2009 ? 2010, texas instruments incorporated submit documentation feedback 13 product folder link(s): tps2421-1 tps2421-2 ( ) straightwire 4 l l 0.2 l ln 0.75 nh d ? ? ? - ? ? ( ) nom load spike absolute l v v i c = + 2 in min v r 12 =
tps2421-1 tps2421-2 slus907d ? january 2009 ? revised august 2010 www.ti.com operation when load current exceeds the user programmed fault limit (i set ) during normal operation the fault timer starts. if load current drops below the i set threshold before the fault timer expires, normal operation continues. if load current stays above the i set threshold the fault timer expires and a fault is declared. when a fault is declared a device operating in latch mode turns off and can be restarted by cycling power or toggling the en signal. a device operating in retry mode attempts to turn on at a 3% duty cycle until the fault is cleared. when the i max limit is reached during a fault the device goes into current limit and the fault timer keeps running. i max is automatically set to 1.25 times i set . startup when power is first applied to a load with discharged capacitors there is a large inrush current. the inrush is controlled by the tps2421 by initially entering the power limit mode and turning on the fault timer. see figure 13 . as the charge builds on the capacitor, the current increases to i max . when the capacitor is fully charged, current output is set by the dc load value, the fault timer is turned off. the fet is then fully enhanced and the power good signal is true. in order to start properly, the fault timer must be set to exceed the capacitor charge time. when the load has a resistive component as well as capacitive, the fault time needs to be increased because current to the resistive load is unavailable to charge the capacitor. the startup time for some selected loading is given in table 2 . table 2 data was taken with i set equal to 4 a. lower current settings of tps2421 do not have a great influence on the start up timer because of operation at power limit. load capacitance and dc resistance was selected for a measured start time. the start time is measured from the assertion of the en pin to the assertion of the pg pin. table 2. start time for input voltage and output loading (1) load capacitance dc load input voltage (v) start time (ms) ( m f) resistance ( ? ) open 2.5 220 5 2.7 12 2.6 5 open 4 1000 5 4 12 4 open 4.4 220 5 no start 12 7 12 open 14 1000 5 no start 12 23 (1) i set = 4 a some combinations of loading and current limit settings exceed the 5-w power limit of the internal mosfet. the output voltage will not turn on regardless of the fault time setting. one way to work with the physical limits that create this problem is to allow the power manager to charge only the capacitive component of the load and use the pg signal to turn on the resistive component. this is common usage in dc-to-dc converters and other electrical equipment with power good inputs. 14 submit documentation feedback copyright ? 2009 ? 2010, texas instruments incorporated product folder link(s): tps2421-1 tps2421-2
tps2421-1 tps2421-2 www.ti.com slus907d ? january 2009 ? revised august 2010 start up into a short the controller attempts to power on into a short for the duration of the timer. figure 20 shows a small current resulting from power limiting the internal mosfet. this happens only once for the latch off part, tps2421-1. for the retry part, tps2421-2, figure 19 shows this cycle repeating at an interval based on the c t time. shutdown modes hard overload - fast trip when a hard overload causes the load current to exceed ~1.6 i set the tps2421 immediately shuts off current to the load without waiting for the fault timer to expire. after such a shutoff the tps2421 enters into startup mode and attempts to apply power to the load. if the hard overload is caused by a current transient, then a normal startup can be expected with a low probability of disruption to the load, assuming there is sufficient load capacitance to hold up the load during the fractions of a millisecond that make up the fast trip/restart cycle. if the hard overload is caused by a real, continuous failure then the tps2421 goes into current limit during the attempt at restart. the timer starts and eventually runs out, shutting off current to the load. see the fast trip figure 17 . when the hard overload occurs the current is turned off, the pg pin becomes false, and the flt pin stays false. the flt pin becomes true only when the fault timer times out. overcurrent shutdown overcurrent shutdown occurs when the output current exceeds i set for the duration of the fault timer. figure 9 shows a step rise in output current which exceeds the i flt threshold but not the i max threshold. the increased current is on for the duration of the timer. at conclusion of the timer, the output is turned off. layout support components locate all tps2421 support components, r set , c t , etc. or any input or output voltage clamps, close to their connection pin. connect the other end of the component to the inner layer gnd without trace length. powerpad ? when properly mounted the powerpad package provides significantly greater cooling ability than an ordinary package. to operate at rated power the power pad must be soldered directly to the pc board gnd plane directly under the device. the powerpad is at gnd potential and can be connected using multiple vias to inner layer gnd. other planes, such as the bottom side of the circuit board can be used to increase heat sinking in higher current applications. refer to technical briefs: powerpad ? thermally enhanced package (ti literature number slma002 ) and powerpad ? made easy (ti literature number slma004 ) for more information on using this powerpadtm package.these documents are available at www.ti.com (search by keyword). copyright ? 2009 ? 2010, texas instruments incorporated submit documentation feedback 15 product folder link(s): tps2421-1 tps2421-2
tps2421-1 tps2421-2 slus907d ? january 2009 ? revised august 2010 www.ti.com design example this tps2421 design supports 12 v to operate a hot plugged disk drive. the 12 v specification for a disk drive is approximately 1-a operating current and 2-a typical spin-up. selecting a 2.5 a setting for i set would allow some margin for the operating current and satisfy the start current requirements. calculate r iflt using equation equation 8 or select it using table 3 . (8) because i set satisfies the spin up current, the timer can be set for the additional loading of charging the capacitor. estimate approximately 20 ms. use either equation 9 or table 3 to estimate the capacitance. (9) to alter parameters i iax , i fault , i imon or c ct use the formulas in the pin description section or use table 3 . figure 21. 12-v, 2.5-a steady state current, 3.125-a max currrent note d1, d2, and c1 are required only in systems with significant feed and/or load inductance. table 3. typical design examples i set (a) r iset (k ? ) c ct ( m f) t fault (ms) t sd (ms) i load(max) (a) 1 200 0.022 0.86 22 1 1.5 133 0.047 1.83 47 1.5 2 100 0.1 3.89 100 2 2.5 80.6 0.22 8.56 220 2.5 3 65.5 0.47 18.28 470 3 3.5 56.2 0.68 26.45 680 3.5 4 49.9 1 38.9 1000 4 16 submit documentation feedback copyright ? 2009 ? 2010, texas instruments incorporated product folder link(s): tps2421-1 tps2421-2 15 vd1 smaj15a 1 2 3 4 8 7 6 5 flt en vin gnd pg vout ct iset 9 pwpd tps2421 r210 k w c1 0.1 m f riset80.6 k w ct560 nf d2mbr130lsft1 gnd 12vin gnd 12vout r110 k w 1 3 6 fault ct 3 3 t 10 c 20 0.514 10 38.9 10 38.9 10 - - = = = ( ) iflt fault 200k 200,000 r 80 k i 2.5 w = = w
tps2421-1 tps2421-2 www.ti.com slus907d ? january 2009 ? revised august 2010 revision history changes from revision a (march 2009) to revision b page ? changed marking .............................................................................................................................................................. 2 ? added for the most current package and ordering information, see the package option addendum at the end of this document, or visit the device product folder on www.ti.com. ......................................................................................... 2 changes from revision b (june 2010) to revision c page ? changed t sd (ms) column .................................................................................................................................................. 16 changes from revision c (july 2010) to revision d page ? added ul listed - file number e169910 ............................................................................................................................. 1 copyright ? 2009 ? 2010, texas instruments incorporated submit documentation feedback 17 product folder link(s): tps2421-1 tps2421-2
package option addendum www.ti.com 28-aug-2010 addendum-page 1 packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ ball finish msl peak temp (3) samples (requires login) tps2421-1dda active so powerpad dda 8 75 green (rohs & no sb/br) cu nipdau level-1-260c-unlim purchase samples tps2421-1ddar active so powerpad dda 8 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim request free samples tps2421-2dda active so powerpad dda 8 75 green (rohs & no sb/br) cu nipdau level-1-260c-unlim purchase samples TPS2421-2DDAR active so powerpad dda 8 2500 green (rohs & no sb/br) cu nipdau level-1-260c-unlim request free samples (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) eco plan - the planned eco-friendly classification: pb-free (rohs), pb-free (rohs exempt), or green (rohs & no sb/br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. tbd: the pb-free/green conversion plan has not been defined. pb-free (rohs): ti's terms "lead-free" or "pb-free" mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, ti pb-free products are suitable for use in specified lead-free processes. pb-free (rohs exempt): this component has a rohs exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. the component is otherwise considered pb-free (rohs compatible) as defined above. green (rohs & no sb/br): ti defines "green" to mean pb-free (rohs compatible), and free of bromine (br) and antimony (sb) based flame retardants (br or sb do not exceed 0.1% by weight in homogeneous material) (3) msl, peak temp. -- the moisture sensitivity level rating according to the jedec industry standard classifications, and peak solder temperature. important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis.
tape and reel information *all dimensions are nominal device package type package drawing pins spq reel diameter (mm) reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p1 (mm) w (mm) pin1 quadrant tps2421-1ddar so power pad dda 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 q1 TPS2421-2DDAR so power pad dda 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 q1 package materials information www.ti.com 27-aug-2010 pack materials-page 1
*all dimensions are nominal device package type package drawing pins spq length (mm) width (mm) height (mm) tps2421-1ddar so powerpad dda 8 2500 358.0 335.0 35.0 TPS2421-2DDAR so powerpad dda 8 2500 358.0 335.0 35.0 package materials information www.ti.com 27-aug-2010 pack materials-page 2

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