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ltc1154 1 1154fb typical application features applications description high side micropower mosfet driver the ltc ? 1154 single high side gate driver allows using low cost n-channel fets for high side switching applications. an internal charge pump boosts the gate drive voltage above the positive rail, fully enhancing an n-channel mos switch with no external components. micropower operation, with 8a standby current and 85a operating current, allows use in virtually all systems with maximum ef? ciency. included on chip is programmable overcurrent sensing. a time delay can be added to prevent false triggering on high inrush current loads. an active high shutdown input is also provided and interfaces directly to a standard ptc thermistor for thermal shutdown. an open-drain output is provided to report switch status to the p . an active low enable input is provided to control multiple switches in banks. the ltc1154 is available in both 8-pin dip and 8-pin soic packages. ultralow voltage drop high side switch with short-circuit protection n fully enhances n-channel power mosfets n 8a i q standby current n 85a i q on current n no external charge pump capacitors n 4.5v to 18v supply range n short-circuit protection n thermal shutdown via ptc thermistor n status output indicates shutdown n available in 8-pin soic and pdip packages n laptop computer power switching n scsi termination power switching n cellular telephone power management n battery charging and management n high side industrial and automotive switching n stepper motor and dc motor control standby supply current irlr024 0.036* ltc1154 ? ta01 5v load p 5v 200k** 0.1f** 2.7a max 51k in en status gnd v s ds g sd ltc1154 all components shown are surface mount. ims026 international manufacturing service, inc. (401) 683-9700 not required if load is resistive or inductive. * ** supply voltage (v) 0 0 supply current (a) 5 15 20 25 50 35 515 ltc1153 ? ta02 10 40 45 30 10 20 v in = 0v t j = 25c l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners.
ltc1154 2 1154fb absolute maximum ratings supply voltage ..........................................................22v input voltage .......................(v s + 0.3v) to (gnd C 0.3v) enable input voltage ...........(v s + 0.3v) to (gnd C 0.3v) gate voltage .........................(v s + 24v) to (gnd C 0.3v) status output voltage ...............................................15v current (any pin) ...................................................50ma (note 1) 1 2 3 4 8 7 6 5 top view v s drain sense gate shutdown n8 package 8-lead pla s ti c dip in enable status gnd t jmax = 100c, ja = 130c/w 1 2 3 4 8 7 6 5 top view v s drain sense gate shutdown s8 package 8-lead plastic soic in enable status gnd t jmax = 100c, ja = 150c/w pin configuration order information lead free finish tape and reel part marking package description temperature range ltc1154cn8#pbf ltc1154cn8#trpbf 8-lead plastic dip 0c to 70c ltc1154cs8#pbf ltc1154cs8#trpbf 1154 8-lead plastic sioc 0c to 70c ltc1154hs8#pbf ltc1154hs8#trpbf 1154h 8-lead plastic sioc C40c to 150c lead based finish tape and reel part marking package description temperature range ltc1154cn8 ltc1154cn8#tr 8-lead plastic dip 0c to 70c ltc1154cs8 ltc1154cs8#tr 1154 8-lead plastic sioc 0c to 70c ltc1154hs8 ltc1154hs8#tr 1154h 8-lead plastic sioc C40c to 150c consult ltc marketing for parts speci? ed with wider operating temperature ranges. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel speci? cations, go to: http://www.linear.com/tapeandreel/ operating temperature ltc1154c ................................................ 0c to 70c ltc1154h .......................................... C40c to 150c storage temperature range ....................C65c to 150c lead temperature (soldering, 10 sec.) ................. 300c electrical characteristics symbol parameter conditions min typ max units v s supply voltage l 4.5 18 v i q quiescent current off v s = 5v, v in = 0v 8 20 a quiescent current on v s = 5v, v in = 5v 85 120 a quiescent current on v s = 12v, v in = 5v 180 400 a v inh input high voltage l 2v the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. v s = 4.5v to 18v, t a = 25c, v en = 0v, v sd = 0v unless otherwise noted.
ltc1154 3 1154fb electrical characteristics 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. symbol parameter conditions min typ max units v inl input low voltage l 0.8 v i in input current 0v < v in < v s l 1 a c in input capacitance 5pf v enh enable input high voltage l 3.5 2.6 v v enl enable input low voltage l 1 0.6 v i en enable input current 0v < v in < v s l 1 a v sdh shutdown input high voltage l 2v v sdl shutdown input low voltage l 0.8 v i sd shutdown input current 0v < v in < v s l 1 a v sen drain sense threshold voltage l 80 75 100 100 120 125 mv mv i sen drain sense input current 0v < v sen < v s l 0.1 a v gate C v s gate voltage above supply v s = 5v v s = 6v v s = 12v l l l 6 7.5 15 7 8.3 18 9 15 25 v v v v stat status output low voltage i stat = 400a l 0.05 0.4 v i stat status output leakage current v stat = 12v l 1a t on turn-on time v s = 5v, c gate = 1000pf time for v gate > v s + 2v time for v gate > v s + 5v 30 100 110 450 300 1000 s s v s = 12v, c gate = 1000pf time for v gate > v s + 5v time for v gate > v s + 10v 20 50 80 160 200 500 s s t off turn-off time v s = 5v, c gate = 1000pf, time for v gate < 1v 10 36 60 s v s = 12v, c gate = 1000pf, time for v gate < 1v 10 28 60 s t sc short-circuit turn-off time v s = 5v, c gate = 1000pf, time for v gate < 1v 5 25 40 s v s = 12v, c gate = 1000pf, time for v gate < 1v 5 23 40 s t sd shutdown turn-off time v s = 5v, c gate = 1000pf, time for v gate < 1v 17 40 s v s = 12v, c gate = 1000pf, time for v gate < 1v 13 35 s the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. v s = 4.5v to 18v, t a = 25c, v en = 0v, v sd = 0v unless otherwise noted.
ltc1154 4 1154fb typical performance characteristics standby supply current supply current on high side gate voltage input threshold voltage drain sense threshold voltage low side gate voltage turn-on time turn-off time short-circuit turn-off delay time supply voltage (v) 0 0 supply current (a) 5 15 20 25 50 35 515 ltc1154 ? tpc01 10 40 45 30 10 20 v in = 0v t a = 25c supply voltage (v) 0 0 supply current (a) 100 300 400 500 1000 700 5 10 ltc1154 ? tpc02 200 800 900 600 15 20 t a = 25c supply voltage (v) 0 0 v gate C v s (v) 6 10 12 14 24 18 5 10 ltc1154 ? tpc03 8 20 22 16 15 20 supply voltage (v) 0 0.4 input threshold voltage (v) 0.6 1.0 1.2 1.4 2.4 1.8 510 ltc1154 ? tpc04 0.8 2.0 2.2 1.6 15 20 v on v off supply voltage (v) 0 50 drain sense threshold voltage (mv) 60 80 90 100 150 120 510 -5$t51$ 70 130 140 110 15 20 supply voltage (v) 0 v gate (v) 15 21 27 8 ltc1154 ? tpc06 9 3 0 246 10 18 24 30 12 6 supply voltage (v) 0 0 turn-on time (s) 100 300 400 500 1000 700 5 10 ltc1153 ? tpc07 200 800 900 600 15 20 v gs = 5v v gs = 2v c gate = 1000pf supply voltage (v) 0 0 turn-off time (s) 5 15 20 25 50 35 515 ltc1154 ? tpc08 10 40 45 30 10 20 c gate = 1000pf time for v gate < 1v supply voltage (v) 0 0 turn-off time (s) 5 15 20 25 50 35 515 ltc1154 ? tpc09 10 40 45 30 10 20 c gate = 1000pf time for v gate < 1v v sen = v s C 1v no external delay
ltc1154 5 1154fb typical performance characteristics standby supply current supply current on input on threshold voltage shutdown threshold voltage enable threshold voltage gate drive current pin functions input and shutdown pins the ltc1154 input pin is active high and activates all of the protection and charge pump circuitry when switched on. the shutdown pin is designed to immediately disable the switch if a secondary fault condition (over temperature, etc.) is detected. the ltc1154 logic and shutdown inputs are high impedance cmos gates with esd protection diodes to ground and supply and therefore should not be forced beyond the power supply rails. the shutdown pin should be connected to ground when not in use. enable input pin the enable input can be used to enable a number of ltc1154 high side switches in banks or to provide a sec- ondary means of control. it can also act as an inverting input. the enable input is a high impedance cmos gate with esd clamp diodes to ground and supply and therefore should not be forced beyond the power supply rails. this pin should be grounded when not in use. temperature (c) C50 0 supply current (a) 5 15 20 25 50 35 0 50 75 ltc1154 ? tpc10 10 40 45 30 C25 25 100 125 v s = 18v v s = 5v v in = 0v v en = 0v temperature (c) C50 0 supply current (a) 100 300 400 500 1000 700 05075 ltc1154 ? tpc11 200 800 900 600 C25 25 100 125 v s = 12v v s = 5v v in = 5v v en = 0v temperature (c) C50 0.4 input threshold voltage (v) 0.6 1.0 1.2 1.4 2.4 1.8 05075 ltc1154 ? tpc12 0.8 2.0 2.2 1.6 C25 25 100 125 v s = 18v v s = 5v temperature (c) C50 0.4 shutdown threshold voltage (v) 0.6 1.0 1.2 1.4 2.4 1.8 05075 ltc1154 ? tpc13 0.8 2.0 2.2 1.6 C25 25 100 125 v s = 18v v s = 5v temperature (c) C50 0 0.5 1.5 2.0 2.5 5.0 3.5 05075 ltc1154 ? tpc14 1.0 4.0 4.5 3.0 C25 25 100 125 v s = 12v disable enable enable threshold voltage (v) gate voltage above supply (v) 1 gate drive current (a) 10 100 1000 0 8 12 16 0.1 4 20 ltc1154 ? tpc15 v s = 18v t a = 25c v s = 12v v s = 5v
ltc1154 6 1154fb block diagram pin functions gate drive pin the gate drive pin is either driven to ground when the switch is turned off or driven above the supply rail when the switch is turned on. this pin is a relatively high impedance when driven above the rail (the equivalent of a few hundred k). care should be taken to minimize any loading of this pin by parasitic resistance to ground or supply. supply pin the supply pin of the ltc1154 serves two vital purposes. the ? rst is obvious: it powers the input, gate drive, regula- tion and protection circuitry. the second purpose is less obvious: it provides a kelvin connection to the top of the drain sense resistor for the internal 100mv reference. the ltc1154 is designed to be continuously powered so that the gate of the mosfet is actively driven at all times. if it is necessary to remove power from the supply pin and then re-apply it, the input pin (or enable pin) should be cycled a few milliseconds after the power is re-applied to reset the input latch and protection circuitry. also, the input and enable pins should be isolated with 10k resistors to limit the current ? owing through the esd protection diodes to the supply pin. the supply pin of the ltc1154 should never be forced below ground as this may result in permanent damage to the device. a 300 resistor should be inserted in series with the ground pin if negative supply voltage transients are anticipated. drain sense pin the drain sense pin is compared against the supply pin voltage. if the voltage at this pin is more than 100mv below the supply pin, the input latch will be reset and the mosfet gate will be quickly discharged. cycle the input, or enable input, to reset the short-circuit latch and turn the mosfet back on. this pin is also a high impedance cmos gate with esd protection and therefore should not be forced beyond the power supply rails. to defeat the overcurrent protection, short the drain sense to supply. some loads, such as large supply capacitors, lamps, or motors require high inrush currents. an rc time delay can be added between the sense resistor and the drain sense pin to ensure that the drain sense circuitry does not false-trigger during start-up. this time constant can be set from a few microseconds to many seconds. however, very long delays may put the mosfet in risk of being destroyed by a short-circuit condition. (see applications information section). status pin the status pin is an open-drain output which is driven low whenever a fault condition is detected. a 51k pull-up resistor should be connected between this output and a logic supply. the status pins of multiple ltc1154s can be ord together if independent fault sensing is not required. no connection is required to this pin when not in use. gate charge and discharge control logic shutdown ttl-to-cmos converter oscillator and charge pump fast/slow gate charge logic fault detection and status output driver 100mv reference analog section input latch r s gate shutdown drain sense one shot ttl-to-cmos converter voltage regulators analog digital gnd low standby current regulator input status v s 10s delay ltc1154 ? bd01 enable comp
ltc1154 7 1154fb truth table operation the truth table demonstrates how the ltc1154 receives inputs and returns status information to the p . the enable and input signal from the p controls the switch in its normal operating mode, where the rise and fall time of the gate drive are controlled to limit emi and rfi emissions. the shutdown and overcurrent detection cir- cuitry however, switch the gate off at a much higher rate to limit the exposure of the mosfet switch and the load to dangerous conditions. the status pin remains high as long as the switch is operating normally, and is driven low only when a fault condition is detected. note that the shutdown pin is edge-sensitive and latches the output off even if the shutdown pin returns to a low state. in x l h h h en h x l l l sd x x l l gate l l h l l status h h h l l switch off switch off switch on switch latched off (over current) switch latched off (shutdown) inputs outputs switch condition l = logic low h = logic high x = irrelevant = edge triggered the ltc1154 is a single micropower mosfet driver with built-in protection, status feedback and gate charge pump. the ltc1154 consists of the following functional blocks: ttl and cmos compatible inputs the ltc1154 input and shutdown input have been designed to accommodate a wide range of logic families. both in- put thresholds are set at about 1.3v with approximately 100mv of hysteresis. a low standby current voltage regulator provides continu- ous bias for the ttl-to-cmos converter. the ttl-to-cmos converter output enables the rest of the circuitry. in this way the power consumption is kept to a minimum in the standby mode. enable input the enable input is cmos compatible and inhibits the input signal whenever it is held logic high. this input should be grounded when not in use. internal voltage regulation the output of the ttl-to-cmos converter drives two regulated supplies which power the low voltage cmos logic and analog blocks. the regulator outputs are isolated from each other so that the noise generated by the charge pump logic is not coupled into the 100mv reference or the analog comparator. gate charge pump gate drive for the mosfet switch is produced by an adap- tive charge pump circuit which generates a gate voltage substantially higher than the power supply voltage. the charge pump capacitors are included on chip and there- fore no external components are required to generate the gate drive. drain current sense the ltc1154 is con? gured to sense the current ? owing into the drain of the power mosfet in a high side ap- plication. an internal 100mv reference is compared to the drop across a sense resistor (typically 0.002 to 0.10) in series with the drain lead. if the drop across this resistor exceeds the internal 100mv threshold, the input latch is reset and the gate is quickly discharged via a large n-channel transistor. controlled gate rise and fall times when the input is switched on and off, the gate is charged by the internal charge pump and discharged in a controlled
ltc1154 8 1154fb applications information figure 1. protecting resistive loads manner. the charge and discharge rates have been set to minimize rfi and emi emissions in normal operation. if a short-circuit or current overload condition is encoun- tered, the gate is discharged very quickly (typically a few microseconds) by a large n-channel transistor. operation status output driver the status circuitry continuously monitors the fault de- tection logic. this open-drain output is driven low when the gate of the mosfet is driven low by the protection circuitry. the status circuitry is reset along with the input latch when the input, or enable input, is cycled. mosfet and load protection the ltc1154 protects the power mosfet switch by remov- ing drive from the gate as soon as an overcurrent condition is detected. resistive and inductive loads can be protected with no external time delay in series with the drain sense pin. lamp loads, however, require that the overcurrent protection be delayed long enough to start the lamp but short enough to ensure the safety of the mosfet. resistive loads loads that are primarily resistive should be protected with as short a delay as possible to minimize the amount of time that the mosfet is subjected to an overload condition. the drain sense circuitry has a built-in delay of approximately 10s to eliminate false triggering by power supply or load transient conditions. this delay is suf? cient to mask short load current transients and the starting of a small capacitor (<1f) in parallel with the load. the drain sense pin can therefore be connected directly to the drain current sense resistor as shown in figure 1. inductive loads loads that are primarily inductive, such as relays, solenoids and stepper motor windings should be protected with as short a delay as possible to minimize the amount of time that the mosfet is subjected to an overload condition. the built-in 10s delay will ensure that the overcurrent protection is not false-triggered by a supply or load transient. no external delay components are required as shown in figure 2. large inductive loads (>0.1mh) may require diodes con- nected directly across the inductor to safely divert the stored energy to ground. many inductive loads have these diodes included. if not, a diode of the proper current rating should be connected across the load, as shown in figure 2, to safely divert the stored energy. figure 2. protecting inductive loads + 100f irfz24 15v r load 12 12v c load 1f 0.036 ltc1154 ? f01 in en status gnd v s ds g sd ltc1154 in en status gnd v s ds g sd ltc1154 + 100f irfz24 15v 12v, 1a solenoid 12v 1n5400 0.036 ltc1154 ? f02
ltc1154 9 1154fb capacitive loads large capacitive loads, such as complex electrical systems with large bypass capacitors, should be powered using the circuit shown in figure 3. the gate drive to the power mosfet is passed through an rc delay network, r1 and c1, which greatly reduces the turn-on ramp rate of the switch. and since the mosfet source voltage follows the gate voltage, the load is powered smoothly and slowly from ground. this dramatically reduces the start-up current ? owing into the supply capacitor(s) which, in turn, reduces supply transients and allows for slower activation of sensi- tive electrical loads. (diode, d1, provides a direct path for the ltc1154 protection circuitry to quickly discharge the gate in the event of an overcurrent condition). applications information lamp loads the inrush current created by a lamp during turn-on can be 10 to 20 times greater than the rated operating current. the circuit shown in figure 4 shifts the current limit threshold up by a factor of 11:1 (to 30a) for 100ms when the bulb is ? rst turned on. the current limit then drops down to 2.7a after the inrush current has subsided. the rc network, r d and c d , in series with the drain sense input should be set to trip based on the expected character- istics of the load after start-up. with this circuit, it is possible to power a large capacitive load and still react quickly to an overcurrent condition. the ramp rate at the output of the switch as it lifts off ground is approximately: dv/dt = (v gate C v th )/(r1 ? c1) and therefore the current ? owing into the capacitor during start-up is approximately: i start-up = c load ? dv/dt using the values shown in figure 3, the start-up current is less than 100ma and does not false-trigger the drain sense circuitry which is set at 2.7a with a 1ms delay. figure 3. powering large capacitive loads in en status gnd v s ds g sd ltc1154 + 470f mtp3055e 15v 12v 0.036 ltc1154 ? f03 c d 0.01f r d 100k r1 100k r2 100k d1 1n4148 c1 0.33f + c load 100f out in en status gnd v s ds g sd ltc1154 + 470f mtp3055el 9.1v 12v 0.036 ltc1154 ? f04 10k 1m 0.1f vn2222ll 100k 12v/1a bulb figure 4. lamp driver with delayed protection selecting r d and c d figure 5 is a graph of normalized overcurrent shutdown time versus normalized mosfet current. this graph is used to select the two delay components, r d and c d , which make up a simple rc delay between the drain sense resistor and the drain sense input. figure 5. overcurrent shutdown time vs mosfet current mosfet current (1 = set current) 1 0.01 overcurrent shutdown time (1 = rc) 10 10 100 ltc1154 ? f05 1 0.1
ltc1154 10 1154fb applications information the y axis of the graph is normalized to one rc time constant. the x axis is normalized to the current. (the set current is de? ned as the current required to develop 100mv across the drain sense resistor). note that the shutdown time is shorter for increasing levels of mosfet current. this ensures that the total energy dissipated by the mosfet is always within the bounds established by the manufacturer for safe operation. (see mosfet data sheet for further information). using a speed-up diode to reduce the amount of time that the power mosfet is in a short-circuit condition, bypass the delay resistor with a small signal diode as shown in figure 6. the diode will engage when the drop across the drain sense resistor exceeds about 0.7v, providing a direct path to the sense pin and dramatically reducing the amount of time the mosfet is in an overload condition. the drain sense resistor value is selected to limit the maximum dc current to 2.8a. the diode conducts when the drain current exceeds 20a and reduces the turn-off time to 15s. reverse battery protection the ltc1154 can be protected against reverse battery conditions by connecting a resistor in series with the ground lead as shown in figure 7. the resistor limits the supply current to less than 50ma with C12v applied. figure 6. using a speed-up diode in en status gnd v s ds g sd ltc1154 + 100f irf530 15v 12v 0.036 ltc1154 ? f06 0.01f 100k 1n4148 load since the ltc1154 draws very little current while in normal operation, the drop across the ground resistor is minimal. the 5v p (or control logic) is protected by the 10k resis- tors in series with the input and status pins. current limited power supplies the ltc1154 requires at least 3.5v at the supply pin to ensure proper operation. it is therefore necessary that the supply to the ltc1154 be held higher than 3.5v at all times, even when the output of the switch is short circuited to ground. the output voltage of a current limited regulator may drop very quickly during short-circuit and pull the supply pin of the ltc1154 below 3.5v before the shutdown circuitry has had time to respond and remove drive from the gate of the power mosfet. a supply ? lter should be figure 7. reverse battery protection figure 8. supply filter for current limited supplies in en status gnd v s ds g sd ltc1154 mtp12n06 15v 12v 0.05 ltc1154 ? f07 load 10k 300 5v p or control logic + 10f 10k 10k 120k 5v 10k in en status gnd v s ds g sd ltc1154 0.1 irlr024 short- circuit 0.1f 100k ltc1154 ? f08 *20 + 47f* + 10f 1n4148 *supply filter components + 100f 5v/2a regulator >7v
ltc1154 11 1154fb typical applications applications information added as shown in figure 8 which holds the supply pin of the ltc1154 high long enough for the overcurrent shutdown circuitry to respond and fully discharge the gate. five volt linear regulators with small output capacitors are the most dif? cult to protect as they can switch from a voltage mode to a current limited mode very quickly. the large output capacitors on many switching regulators may be able to hold the supply pin of the ltc1154 above 3.5v suf? ciently long that this extra ? ltering is not required. because the ltc1154 is micropower in both the standby and on state, the voltage drop across the supply ? lter is less than 2mv, and does not signi? cantly alter the accuracy of the 100mv drain sense threshold voltage. in en status ? gnd v s ds g sd ltc1154 + 100f irlz24 6v ltc1154 ? ta03 6v load 5v *rl3006-50-100-25-pt0 keystone 30k ptc thermistor (100c)* p or control logic in en status ? gnd v s ds g sd ltc1154 irlz24 5v ltc1154 ? ta04 6v load 5v p or control logic 1f** + 100f 10k 1n4148* 2n2907 10k optional if supply voltage less than 6v. capacitor charged to supply voltage. shutdown occurs when supply voltage drops by 0.6v. * ** + in en status ? gnd v s ds g sd ltc1154 + 10f irld024 4.75v to 5.25v ltc1154 ? ta05 5v load 5v switch is shutdown when v s > 5.7v p or control logic 100 5.6v in en status ? gnd v s ds g sd ltc1154 mtp12n06 24v to 28v ltc1154 ? ta06 24v to 28v load 5v * keystone rl2006-100-100-30-pt. mount on mosfet or load heat sink p or control logic 10f + 100f 3k 18v ptc thermistor (100c)* 200k + high side driver with thermal shutdown high side driver with overvoltage shutdown high side driver with undervoltage shutdown 24v to 28v high side switch with thermal shutdown ? a 51k pullup resistor should be connected between status output and 5v logic supply.
ltc1154 12 1154fb typical applications 24v to 28v switch with bootstrapped supply high side relay driver with overcurrent protection and status feedback 4-cell-to-5v extremely low voltage drop regulator with overcurrent shutdown, status feedback, ramped turn-on and 8a standby current in en status ? gnd v s ds g sd ltc1154 mtp15n06e 24v to 28v ltc1154 ? ta07 24v to 28v load 5v * keystone rl2006-100-100-30-pt. mount on mosfet or load heat sink. i q(off) = 60ma, i q(on) = 1ma. p or control logic 10f + 100f 100k 18v ptc thermistor (100c)* 200k + 6.2k 1n4148 in en status ? gnd v s ds g sd ltc1154 mtd3055e 12v ltc1154 ? ta08 5v coil current limited to 350ma. contact current limited to 5a. p or control logic + 100f 0.02 0.01f 1n4148 10k 2 to 12v load 15v 1n4001 in en status ? gnd v s ds g sd ltc1154 ltc1154 ? ta09 1n4148 100k 100k 0.22f + 100f 4-cell battery pack 200pf 10k 8 lt1431 7 3 4 1 56 0.036 irlr024 5v/2a + 470f esr < 0.5 5v p or control logic ? a 51k pullup resistor should be connected between status output and 5v logic supply.
ltc1154 13 1154fb typical applications bank controlled high side switches with global thermal and overvoltage shutdown in en status gnd v s ds g sd ltc1154 in en status gnd v s ds g sd ltc1154 in en status gnd v s ds g sd ltc1154 in en status gnd v s ds g sd ltc1154 15v irlr024 15v irlr024 15v irlr024 15v irlr024 ptc thermistor (100c)* 15v 120k + 470f 12v 100 output 1 output 2 output 3 output 4 p or control logic 51k 5v ltc1154 ? ta10 *keystone rl2006-100-100-30-pt. mount on common heat sink.
ltc1154 14 1154fb 12v step-up regulator with ultralow standby current, overcurrent protection and status feedback 12v step-up regulator with 1a overcurrent protection, switch status feedback and ramped output typical applications in en status gnd v s ds g sd ltc1154 5v ltc1154 ? ta11 51k 0.22f + 470f 47f on/off status + 10k 1n4148 irlz24 1n4148 100k 100k 0.1f 12v/1a 20 150f + v in v sw fb gnd v c lt1070 1k 1f 13 5 4 2 50h 10.72k 1% 1.24k 1% 1n5820 + 330f 0.02 in en status gnd v s ds g sd ltc1154 5v ltc1154 ? ta12 0.1f on/off status 1n4148 100k 100k 0.22f + 330f 0.1 + v in v sw fb gnd v c lt1070 1k 1f 13 5 4 2 50h 10.72k 1% 1.24k 1% 1n5820 10k 1n4148 irf530 12v/1a 47f 12v + 150f 51k
ltc1154 15 1154fb package description n8 1002 .065 (1.651) typ .045 ?.065 (1.143 ?1.651) .130 .005 (3.302 0.127) .020 (0.508) min .018 .003 (0.457 0.076) .120 (3.048) min 12 3 4 87 6 5 .255 .015* (6.477 0.381) .400* (10.160) max .008 ?.015 (0.203 ?0.381) .300 ?.325 (7.620 ?8.255) .325 +.035 ?015 +0.889 0.381 8.255 () note: 1. dimensions are inches millimeters *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .010 inch (0.254mm) .100 (2.54) bsc n8 package 8-lead pdip (narrow .300 inch) (reference ltc dwg # 05-08-1510)
ltc1154 16 1154fb .016 ?.050 (0.406 ?1.270) .010 ?.020 (0.254 ?0.508) 45 0 ?8 typ .008 ?.010 (0.203 ?0.254) so8 0303 .053 ?.069 (1.346 ?1.752) .014 ?.019 (0.355 ?0.483) typ .004 ?.010 (0.101 ?0.254) .050 (1.270) bsc 1 2 3 4 .150 ?.157 (3.810 ?3.988) note 3 8 7 6 5 .189 ?.197 (4.801 ?5.004) note 3 .228 ?.244 (5.791 ?6.197) .245 min .160 .005 recommended solder pad layout .045 .005 .050 bsc .030 .005 typ inches (millimeters) note: 1. dimensions in 2. drawing not to scale 3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm) s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610) package description
ltc1154 17 1154fb information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. revision history rev date description page number b 4/11 updated graph tpc05 updated scsi termination typical application updated related parts 4 18 18 (revision history begins at rev b)
ltc1154 18 1154fb linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 1992 lt 0411 rev b ? printed in usa related parts typical applications part number description comments ltc4440/ltc4440-5 high speed, high voltage high side gate driver up to 80v supply voltage, 8v v cc 15v, 2.4a peak pull-up/1.5 peak pull-down ltc4441/ltc4441-1 n-channel mosfet gate driver up to 25v supply voltage, 5v v cc 25v, 6a peak output current lt1910 protected high side gate driver up to 48v supply voltage, short circuit protected ltc4446 high voltage synchronous n-channel mosfet driver without shoot thru protection up to 100v supply voltage, 7.2v v cc 13.5v, 3a peak pull-up/0.55 peak pull-down ltc4444/ltc4444-5 high voltage synchronous n-channel mosfet driver with shoot thru protection up to 100v supply voltage, 4.5v/7.2v v cc 13.5v, 3a peak pull-up/ 0.55 peak pull-down ltc4442/ltc4449 high speed synchronous n-channel mosfet driver up to 38v supply voltage, 4.5v/6v v cc 9.5v, 3.2a peak pull-up/ 4.5a peak pull-down auto-reset high side switch with overcurrent and overcurrent temperature shutdown scsi termination power switch with 1a overcurrent shutdown, auto-reset and load soft-start in en status gnd v s ds g sd ltc1154 mtp12n06 12v ltc1154 ? ta13 12v load 18v ptc thermistor (100c)* 200k 0.036 + 100f 1m r t 1m** + c t 100f** vn2222ll on/off keystone rl2006-100-100-30-pt. auto-reset period 800ms with components shown * ** 5v -5$t5" 0.1f + 100f 47f on/off + 10k 1n4148 mtd3055el 1n4148 100k 100k 0.22f 1n5817 + 10f 7" 20 in en 45"564 gnd v s ds g sd ltc1154 1m vn2222ll + 1f 1m 0.1

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