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| ltc2950-1/ltc2950-2 1 295012fd en 2v/div pb 10ms/div 2950 ta01b pushbutton on/off controller the ltc ? 2950 is a micropower, wide input voltage range, pushbutton on/off controller. the part contains a pushbut - ton input with independently programmable on and off debounce times that control the toggling of an open drain enable output. the part also contains a simple micropro- cessor interface to allow for proper system housekeeping prior to power down. under system fault conditions, an internal kill timer ensures proper power down. the ltc2950 operates over a wide 2.7v to 26.4v input voltage range to accommodate a wide variety of input power supplies. very low quiescent current (6a typical) makes the ltc2950 ideally suited for battery powered applications. two versions of the part are available to ac - commodate either positive or negative enable polarities. the parts are available in either 8-lead 3mm 2mm dfn or thinsot packages. l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks and thinsot and powerpath are trademarks of linear technology corporation. all other trademarks are the property of their respective owners. n portable instrumentation meters n blade servers n portable customer service pda n desktop and notebook computers n adjustable pushbutton on/off timers n low supply current: 6a n wide operating voltage range: 2.7v to 26.4v n en output (ltc2950-1) allows dc/dc converter control n en output (l tc2950-2) allows circuit breaker control n simple interface allows graceful p shut down n high input voltage pb pin with internal pull up resistor n 10kv esd hbm on pb input n accurate 0.6v threshold on kill comparator input n 8-pin 3mm 2mm dfn and thinsot? packages v in shdn** v in v out en int kill int kill ltc2950-1 ont offt dc/dc buck p/c 2.7v to 26.4v *optional **shdn internally pulled up by dc/dc r1 10k 2950 ta01 c ont * 0.033f c offt * 0.033f pb gnd v in typical a pplica t ion turn on debounce descrip t ion fea t ures a pplica t ions
ltc2950-1/ltc2950-2 2 295012fd supply voltage (v in ) .................................. C0 .3v to 33v input voltages pb ............................................................. C 6v to 33v ont ...................................................... C 0.3v to 2.7v offt ..................................................... C 0.3v to 2.7v kill ......................................................... C 0.3v to 7v output voltages int ......................................................... C0 .3v to 10v en/ en .................................................... C 0.3v to 10v operating temperature range ltc2950c-1 ............................................. 0 c to 70c ltc2950c-2 ............................................. 0 c to 70c ltc2950i-1 .......................................... C 40c to 85c ltc2950i-2 .......................................... C 40c to 85c storage temperature range dfn package ..................................... C 65c to 125c tsot-23 ............................................. C 65c to 150c lead temperature (soldering, 10 sec) ................... 3 00c top view ddb8 package 8-lead (3mm 2mm) plastic dfn 5 6 7 8 9 4 3 2 1gnd ont pb v in int en/en offt kill t jmax = 125c, ja = 165c/w exposed pad (pin 9) pcb gnd connection optional v in 1 pb 2 ont 3 gnd 4 8 kill 7 offt 6 en/en 5 int top view ts8 package 8-lead plastic tsot-23 t jmax = 125c, ja = 140c/w lead free finish tape and reel (mini) tape and reel part marking* package description temperature range ltc2950cddb-1#trmpbf ltc2950cddb-1#trpbf lbkp 8-lead plastic dfn 0c to 70c ltc2950cddb-2#trmpbf ltc2950cddb-2#trpbf lbng 8-lead plastic dfn 0c to 70c ltc2950iddb-1#trmpbf ltc2950iddb-1#trpbf lbkp 8-lead plastic dfn C40c to 85c ltc2950iddb-2#trmpbf ltc2950iddb-2#trpbf lbng 8-lead plastic dfn C40c to 85c ltc2950cts8-1#trmpbf ltc2950cts8-1#trpbf ltbkn 8-lead plastic tsot-23 0c to 70c ltc2950cts8-2#trmpbf ltc2950cts8-2#trpbf ltbnf 8-lead plastic tsot-23 0c to 70c ltc2950its8-1#trmpbf ltc2950its8-1#trpbf ltbkn 8-lead plastic tsot-23 C40c to 85c ltc2950its8-2#trmpbf ltc2950its8-2#trpbf ltbnf 8-lead plastic tsot-23 C40c to 85c trm = 500 pieces. *temperature grades are identified by a label on the shipping container. consult ltc marketing for parts specified with wider operating temperature ranges. consult ltc marketing for information on lead based finish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ p in c on f igura t ion a bsolu t e maxi m u m r a t ings (note 1) o r d er i n f or m a t ion ltc2950-1/ltc2950-2 3 295012fd symbol parameter conditions min typ max units v in supply voltage range steady state operation l 2.7 26.4 v i in v in supply current system power on, v in = 2.7v to 24v l 6 12 a v uvl v in undervoltage lockout v in falling l 2.2 2.3 2.4 v v uvl(hyst) v in undervoltage lockout hysteresis 50 300 600 mv pushbutton, enable (pb, en/en) v pb(min, max) pb voltage range single-ended l C1 26.4 v i pb pb input current 2.5v < v pb < 26.4v v pb = 1v v pb = 0.6v l l l C1 C3 C6 C9 1 C12 C 15 a a a v pb (vth) pb input threshold pb falling l 0.6 0.8 1 v v pb(voc) pb open circuit voltage i pb = C 1a 1 1.6 2 v t en/en, lock out en/en lock out time (note 5) enable released enable asserted l 200 256 325 ms i en/en(lkg) en/en leakage current v en/ en = 1v, sink current off l 0.1 a v en/en(vol) en/en voltage output low i en/ en = 3ma l 0.11 0.4 v debounce timing pins (ont, offt) i ont, offt(pu) ont/offt pull up current v ont, offt = 0v l C2.4 C3 C3.6 a i ont, offt(pd) ont/offt pull down current v ont, offt = 1.3v l 2.4 3 3.6 a t db, on internal turn on debounce time ont pin float, pb falling enable asserted l 26 32 41 ms t ont additional adjustable turn on time c ont = 1500pf l 9 11.5 13.5 ms t db, off internal turn off debounce time offt pin float, pb falling int falling l 26 32 41 ms t offt additional adjustable turn off time c offt = 1500pf l 9 11.5 13.5 ms p handshake pins (int, kill) i int(lkg) int leakage current v int = 3v l 1 a v int(vol) int output voltage low i int = 3ma l 0.11 0.4 v v kill(th) kill input threshold voltage kill falling l 0.57 0.6 0.63 v v kill(hyst) kill input threshold hysteresis 10 30 50 mv i kill(lkg) kill leakage current v kill = 0.6v 0.1 a t kill (pw) kill minimum pulse width l 30 s t kill(pd) kill propagation delay kill falling enable released l 30 s t kill, on blank kill turn on blanking (note 3) kill = low, enable asserted enable released l 400 512 650 ms t kill, off delay kill turn off delay (note 4) kill = high, int asserted enable released l 800 1024 1300 ms note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: all currents into pins are positive; all voltages are referenced to gnd unless otherwise noted. note 3: the kill turn on blanking timer period is the waiting period immediately after the enable output is asserted. this blanking time allows sufficient time for the dc/dc converter and the p to perform power up tasks. the kill and pb inputs are ignored during this period. if kill remains low at the end of this time period, the enable output is released, thus turning off system power. this time delay does not include t db, on or t ont . note 4: the kill turn off delay is the maximum delay from the initiation of a shutdown sequence (int falling), to the release of the enable output. if the kill input switches low at any time during this period, enable is released, thus turning off system power. this time is internally fixed at 1024ms. this time delay does not include t db, off or t offt . note 5: the enable lock out time is designed to allow an application to properly power down such that the next power up sequence starts from a consistent powered down configuration. pb is ignored during this lock out time. this time delay does not include t db, on or t ont . e lec t rical c harac t eris t ics the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c. v in = 2.7v to 26.4v, unless otherwise noted. (note 2) ltc2950-1/ltc2950-2 4 295012fd temperature (c) ?50 i vin (a) 10 8 6 4 2 0 ?25 0 25 50 2950 g01 75 100 v in = 26.4v v in = 3.3v v in = 2.7v 0 5 10 15 20 25 30 v in (v) i vin (a) 10 8 6 4 2 0 2950 g02 t a = 25c 2950 g03 v in (v) 0 0 t db, on (ms) 10 20 30 40 50 5 10 15 20 25 30 t a = 25c supply current vs temperature supply current vs supply voltage internal default turn on debounce time (t db, on ) vs v in 1 t db, on + t ont (ms) 100 1000 1000 2950 g04 10 10 100 10000 t a = 25c v in = 3.3v ont external capacitor (nf) temperature (c) ?50 ?25 0 25 50 75 100 ont pull-down current (a) 2950 g05 ?3.4 ?3.2 ?3.0 ?2.8 ?2.6 v in = 26.4v v in = 2.7v v in (v) 0 t db, off (ms) 5 10 15 20 2950 g06 25 30 50 40 30 20 10 0 t a = 25c 2950 g07 1 t db, off + t offt (ms) 100 1000 1000 10 10 100 10000 t a = 25c v in = 3.3v offt external capacitor (nf) 2950 g08 temperature (c) ?50 ?25 0 25 50 75 100 offt pull-down current (a) ?3.4 ?3.2 ?3.0 ?2.8 ?2.6 v in = 26.4v v in = 2.7v pb current (a) 2950 g09 ?10 0 10 20 30 ?5 5 15 25 ?250 ?200 ?150 ?100 ?50 0 pb voltage (v) t a = 25c v in = 3.3v turn on debounce time (t db, on + t ont ) vs ont external capacitor ont pull-down current vs temperature internal default turn off debounce time (t db, off ) vs v in turn off debounce time (t db, off + t offt ) vs offt external capacitor offt pull-down current vs temperature current vs pb voltage typical p er f or m ance c harac t eris t ics ltc2950-1/ltc2950-2 5 295012fd 2950 g10 0 0 50 100 150 200 250 300 5 10 15 20 v in = 3.3v t a = 25c pb voltage (mv) external pb resistance to ground (k ) t a = ?45c t a = 100c en/en current load (ma) 0 en/en voltage (mv) 500 400 300 200 100 0 8 2950 g11 2 4 6 10 t a = 25c v in = 3.3v v in (v) 0 en (v) 4 2950 g12 1 2 3 t a = 25c 100k pull-up from en to v in 1.0 0.8 0.6 0.4 0.2 0 en (v) 2950 g13 v in (v) 0 4 1 2 3 4 3 2 1 0 t a = 25c 100k pull-up from en to v in en (ltc2950-1) voltage vs v in en (ltc2950-2) voltage vs v in pb voltage vs external pb resistance to ground en/en v ol vs current load typical p er f or m ance c harac t eris t ics ltc2950-1/ltc2950-2 6 295012fd v in (pin 1/pin 4): power supply input: 2.7v to 26.4v. pb (pin 2/pin 3): pushbutton input. connecting pb to ground through a momentary switch provides on/off control via the en/en pin. an internal 100k pull-up resis- tor connects to an internal 1.9v bias voltage. the rugged pb input can be pulled up to 26.4v externally without consuming extra current. ont (pin 3/pin 2): additional adjustable turn on time input. placing an external capacitor to ground determines the additional time (beyond the internal default 32ms) the pb pin must be held low before the enable output is asserted. floating this pin results in a default turn on debounce time of 32ms. gnd (pin 4/pin 1): device ground. int (pin 5/pin 8): open drain interrupt output. after a pushbutton turn-off event is detected, the ltc2950 inter - rupts the system (p) by bringing the int pin low. once the system finishes its power down and housekeeping tasks, it sets kill low, which in turn releases the enable output. if at the end of the power down timer (1024ms) kill is still high, the enable output is released immediately. int may optionally be tied to kill to release the enable output immediately after the turn-off event has been detected (int = low). en (ltc2950-1, pin 6/pin 7): open drain enable output. this pin is intended to enable system power. en is asserted high after a valid pb turn on event. en is released low if: a) kill is not driven high (by p) within 512ms of the initial valid pb power turn-on event, b) kill is driven low dur - ing normal operation, c) a second valid pb event (power turn-off) is detected. this pin can connect directly to a dc/dc converter shutdown pin that provides an internal pull-up. otherwise a pull-up resistor to an external supply is required. the operating range for this pin is 0v to 10v. en (ltc2950-2, pin 6/pin 7): open drain enable output. this pin is intended to enable system power. en is asserted low after a valid pb turn-on event. en releases high if: a) kill is not driven high (by p) within 512ms of the initial valid pb power turn-on event, b) kill is driven low dur - ing normal operation, c) a second valid pb event (power turn-off) is detected. this pin can connect directly to a dc/dc converter shutdown pin that provides an internal pull-up. otherwise a pull-up resistor to an external supply is required. the operating range of this pin is 0v to 10v. offt (pin 7/pin 6): additional adjustable turn off time input. a capacitor to ground determines the additional time (beyond the internal default 32ms) that the pb pin must be held low before initiating a power down sequence (int falling). floating this pin results in a default turn off time of 32ms. kill (pin 8/pin 5): kill input. forcing kill low releases the enable output. during system turn on, this pin is blanked by a 512ms internal timer to allow the system to pull kill high. this pin has an accurate 0.6v threshold and can be used as a voltage monitor input. if unused, connect to a low voltage output supply (see figure 6). exposed pad (pin 9): exposed pad may be left open or connected to device ground. (tsot-23/dfn) p in func t ions ltc2950-1/ltc2950-2 7 295012fd kill en/en t kill(pw) t kill(pd) 2950 td01 logic oscillator oscillator debounce 2.4v 2.4v 100k pb gnd v in 2.7v to 26.4v en/en kill int ont offt 0.8v 0.6v 2950 bd regulator 10s filter b lock diagra m ti m ing diagra m s ltc2950-1/ltc2950-2 8 295012fd power on timing power off timing, kill > 0.6v t db, on t ont pb 16 cycles pb & kill ignored en (ltc2950-1) en (ltc2950-2) t kill, on blank 2950 td02 t db, off t offt pb int offt pb ignored t kill, off delay 2950 td03 16 cycles en (ltc2950-1) en (ltc2950-2) t i m ing diagra ms ltc2950-1/ltc2950-2 9 295012fd description the ltc2950 is a low power (6a), wide input voltage range (2.7v to 26.4v), pushbutton on/off controller that can interface to a p and a power supply. the turn-on and turn-off debounce times are extendable using optional external capacitors. a simple interface ( int output, kill input) allows a system to power on and power off in a controlled manner. turn on when power is first applied to the ltc2950, the part ini - tializes the output pins. any dc/dc converters connected to the en/en pin will therefore be held off. to assert the enable output, pb must be held low for a minimum of 32ms (t db, on ). the ltc2950 provides additional turn on debounce time via an optional capacitor connected to the ont pin (t ont ). the following equation describes the ad- ditional time that pb must be held low before asserting the enable output. c ont is the ont external capacitor: c ont = 1.56e-4 [f/ms] ? (t ont C 1ms) once the enable output is asserted, any dc/dc converters connected to this pin are turned on. the kill input from the p is ignored during a succeeding 512ms blanking time (t kill , on blank). this blanking time represents the maximum time required to power up the dc/dc converter and the p. if kill is not brought high during this 512ms time window, the enable output is released. the assumption is that 512ms is sufficient time for the system to power up. turn off to initiate a power off sequence, pb must be held low for a minimum of 32ms (t db, off ). additional turn off debounce time may be added via an optional capacitor connected to the offt pin (t offt ). the following equation describes the additional time that pb must be held low to initiate a power off sequence. c offt is the offt external capacitor: c offt = 1.56e-4 [f/ms] ? (t offt C 1ms) once pb has been validly pressed, int is switched low. this alerts the p to perform its power down and housekeeping tasks. the power down time given to the p is 1024ms. note that the kill input can be pulled low (thereby releasing the enable output) at any time after t kill , on blank period. simplified power on/off sequence figure 1 shows a simplified ltc2950-1 power on and power off sequence. a high to low transition on pb (t 1 ) initiates the power on sequence. this diagram does not show any bounce on pb. in order to assert the enable output, the pb pin must stay low continuously (pb high resets timers) for a time controlled by the default 32ms and the external ont capacitor (t 2 Ct 1 ). once en goes high (t 2 ), an internal 512ms blanking timer is started. this blanking timer is designed to give sufficient time for the dc/dc converter to reach its final voltage, and to allow the p enough time to perform power on tasks. the kill pin must be pulled high within 512ms of the en pin going high. failure to do so results in the en pin going low 512ms after it went high. (en = low, see figure 2). note that the ltc2950 does not sample kill and pb until after the 512ms internal timer has expired. the reason pb is ignored is to ensure that the system is not forced off while powering on. once the 512ms timer expires (t 4 ), the release of the pb pin is then debounced with an internal 32ms timer. the system has now properly powered on and the ltc2950 monitors pb and kill (for a turnoff command) while consuming only 6a of supply current. a high to low transition on pb (t 5 ) initiates the power off sequence. pb must stay low continuously (pb high resets debounce timer) for a period controlled by the default 32ms and the external offt capacitor (t 6 Ct 5 ). at the completion of the offt timing (t 6 ), an interrupt (int) is set, signifying that en will be switched low in 1024ms. once a system has finished performing its power down operations, it can set kill low (t 7 ) and thus immediately set en low), terminating the internal 1024ms timer. the release of the pb pin is then debounced with an internal 32ms timer. the system is now in its reset state: where the ltc2950 is in low power mode (6a). pb is monitored for a high to low transition. a pplica t ions i n f or m a t ion ltc2950-1/ltc2950-2 10 295012fd figure 1. simplified power on/off sequence for ltc2950-1 figure 2. aborted power on sequence for ltc2950-1 t abort pb kill power on timing en 512ms internal timer t db, on + t ont power turned off 2950 f02 p failed to set kill high t 1 t 2 t db, on t ont t 3 t 4 t 5 t 6 t 7 pb ont offt en kill int pb & kill ignored pb ignored 2950 f01 t kill, on blank t db, off t offt ltc2950-1/ltc2950-2 12 295012fd the following equations describe the turn on and turn off times. c ont and c offt are the external programming capacitors: t bd,on + t ont = 32ms + 1ms + (6.7x10 6 ) ? c ont t bd,off + t offt = 32ms + 1ms + (6.7x10 6 ) ? c offt high voltage pins the v in and pb pins can operate at voltages up to 26.4v. pb can, additionally, operate below ground (C6v) without latching up the device. pb has an esd hbm rating of 10kv. if the pushbutton switch connected to pb exhibits high leakage current, then an external pull-up resistor to v in is recommended. furthermore, if the pushbutton switch is physically located far from the ltc2950 pb pin, parasitic capacitances may couple onto the high impedance pb input. additionally, parasitic series inductance may cause unpredictable ringing at the pb pin. placing a 5k resistor from the pb pin to the pushbutton switch would mitigate parasitic inductance problems. placing a 0.1f capacitor on the pb pin would lessen the impact of parasitic capaci- tive coupling. voltage monitoring with kill input the kill pin can be used as a voltage monitor. figure 5 shows an application where the kill pin has a dual function. it is driven by a low leakage open drain output of the p. it is also connected to a resistor divider that monitors battery voltage (v in ). when the battery voltage falls below the set value, the voltage at the kill pin falls below 0.6v and the en pin is quickly pulled low. note that the resistor values should be as large as possible, but small enough to keep leakage currents from tripping the 0.6v kill comparator. the dc/dc converter shown has an internal pull-up current on its shdn pin. a pull-up resistor on en is thus not needed. operation without p figure 6 shows how to connect the kill pin when there is no circuitry available to drive it. the minimum pulse width detected is 30s. if there are glitches on the resistor pull-up voltage that are wider than 30s and transition figure 5. input voltage monitoring with kill input figure 6. no p application pb v in shdn** v in v out en int kill int kill (open drain) ltc2950-1 gnd ont offt lt1767-3.3 p 9v r1 10k 3.3v 2950 f05 c4 0.1f r3 806k 1% r2 100k 1% 5.4v threshold v in c ont * 0.033f c offt * 0.033f *optional **shdn internally pulled up by the lt1767-3.3 v in shdn** v in v out lt1767-3.3 9v 3.3v r1 100k c3* 0.01f 2950 f06 + c4 0.1f pb en int kill ltc2950-1 gnd ont offt v in c ont * 0.033f c offt * 0.033f *optional **shdn internally pulled up by the lt1767-3.3 a pplica t ions i n f or m a t ion typical a pplica t ions ltc2950-1/ltc2950-2 13 295012fd below 0.6v, then an appropriate bypass capacitor should be connected to the kill pin. powerpath? switching the en open drain output of the ltc2950-2 is designed to switch on/off an external power pfet. this allows a user to connect/disconnect a power supply (or battery) to its load by toggling the pb pin. figure 7 shows the ltc2950-2 controlling a two cell li-ion battery application. the int and kill pins are connected to the output of the pfet through a resistor divider. the kill pin serves as a voltage monitor. when v out drops below 6v, the en pin is open circuited 30s later. v out r1 909k 1% r4 100k 1% c3* 0.1f 2950 f07 c4 0.1f ceramic *optional open drain output v th = 0.6v input r5 100k m1 + 4.2v single cell li-ion battery + 4.2v single cell li-ion battery optional glitch filter capacitor v out ,trip point = 6v pb en int kill ltc2950-2 gnd ont offt v in c ont * 0.033f c offt * 0.033f pb v in ltc2950-1 gnd ont r6 5k 2950 f08 trace capacitance parasitics c5 0.1f details omitted for clarity trace inductance noise en int kill offt v in figure 7. powerpath control with 6v undervoltage detect figure 8. noisy pb trace pb pin in a noisy environment the rugged pb pin is designed to operate in noisy envi- ronments. transients below ground (>C6v) and above v in (<30v) will not damage the rugged pb pin. additionally, the pb pin can withstand esd hbm strikes up to 10kv. in order to keep external noise from coupling inside the ltc2950, place an r-c network close to the pb pin. a 5k resistor and a 0.1f capacitor should suffice for most noisy applications (see figure 8). external pull-up resistor on pb an internal pull-up resistor on the pb pin makes an ex- ternal pull-up resistor unnecessary. leakage current on typical a pplica t ions ltc2950-1/ltc2950-2 14 295012fd the pb board trace, however, will affect the open circuit voltage on the pb pin. if the leakage is too large (>2a), the pb voltage may fall close to the threshold window. to mitigate the effect of the board leakage, a 10k resistor to v in is recommended (see figure 9). pb v in ltc2950-1/ ltc2950-2 gnd external board leakage current 100k 2.4v r7 10k 2950 f09 >2a pins omitted for clarity if external parasitic board leakage >2a, use external pull-up resistor v in figure 9. external pull-up resistor on pb pin reverse battery protection to protect the ltc2950 from a reverse battery connection, place a 1k resistor in series with the v in pin (see figure 10). typical a pplica t ions ltc2950-1/ltc2950-2 15 295012fd p ackage descrip t ion ddb package 8-lead plastic dfn (3mm 2mm) (reference ltc dwg # 05-08-1702 rev b) 2.00 0.10 (2 sides) note: 1. drawing conforms to version (wecd-1) in jedec package outline m0-229 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package 0.40 0.10 bottom view?exposed pad 0.56 0.05 (2 sides) 0.75 0.05 r = 0.115 typ r = 0.05 typ 2.15 0.05 (2 sides) 3.00 0.10 (2 sides) 1 4 8 5 pin 1 bar top mark (see note 6) 0.200 ref 0 ? 0.05 (ddb8) dfn 0905 rev b 0.25 0.05 2.20 0.05 (2 sides) recommended solder pad pitch and dimensions 0.61 0.05 (2 sides) 1.15 0.05 0.70 0.05 2.55 0.05 package outline 0.25 0.05 0.50 bsc pin 1 r = 0.20 or 0.25 45 chamfer 0.50 bsc ltc2950-1/ltc2950-2 16 295012fd p ackage descrip t ion 1.50 ? 1.75 (note 4) 2.80 bsc 0.22 ? 0.36 8 plcs (note 3) datum ?a? 0.09 ? 0.20 (note 3) ts8 tsot-23 0710 rev a 2.90 bsc (note 4) 0.65 bsc 1.95 bsc 0.80 ? 0.90 1.00 max 0.01 ? 0.10 0.20 bsc 0.30 ? 0.50 ref pin one id note: 1. dimensions are in millimeters 2. drawing not to scale 3. dimensions are inclusive of plating 4. dimensions are exclusive of mold flash and metal burr 5. mold flash shall not exceed 0.254mm 6. jedec package reference is mo-193 3.85 max 0.40 max 0.65 ref recommended solder pad layout per ipc calculator 1.4 min 2.62 ref 1.22 ref ts8 package 8-lead plastic tsot-23 (reference ltc dwg # 05-08-1637 rev a) ltc2950-1/ltc2950-2 17 295012fd information furnished by linear technology corporation is believed to be accurate and reliable. how- ever, no responsibility is assumed for its use. linear technology corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. r evision h is t ory rev date description page number d 02/11 revised typical application. revised absolute maximum ratings and pin configuration. updated electrical characteristics revised en and en pin descriptions in pin functions. updated block diagram revised figures 5 and 6. updated related parts. 1 2 3 6 7 12 18 (revision history begins at rev d) ltc2950-1/ltc2950-2 18 295012fd linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com linear technology corporation 2008 lt 0211 rev d ? printed in usa v in shdn v out int kill lt1761-1.8 r1 10k r8 1k r5 910k 2950 f10 c4 0.1f + p 1.8v 9v battery pb en int kill ltc2950-1 gnd ont offt c ont * 0.033f v in c offt * 0.033f *optional figure 10. reverse battery protection typical a pplica t ion r ela t e d p ar t s part number description comments ltc2900 programmable quad supply monitor adjustable reset, 10-lead msop and 3mm w 3mm dfn packages ltc2904/ltc2905 pin-programmable dual supply monitors adjustable reset and tolerance, 8-lead sot-23 and 3mm w 2mm dfn packages ltc4411 2.6a low loss ideal diode in thinsot no external mosfet, automatic switching between dc sources ltc4412hv powerpath controller in thinsot efficient diode-oring, automatic switching between dc sources, 3v to 36v ltc4055 usb power controller and li-ion charger automatic switchover, charges 1-cell li-ion batteries ltc2951 micropower pushbutton on/off controller adjustable power-off timer ltc2952 pushbutton powerpath controller with supervisor automatic low loss switchover between dc sources ltc2953 pushbutton on/off controller with voltage monitoring high voltage pushbutton controller with 200ms voltage reset monitor ltc2954 pushbutton on/off controller with p interrupt allow controlled software system shutdown |
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