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TLF4277 low drop out linear voltage regulator integrated current monitor data sheet, rev. 1.0, may 2009 automotive power
data sheet 2 rev. 1.0, 2009-05-07 TLF4277 table of contents 1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.2 pin definitions and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 general product characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.2 functional range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.3 thermal resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.1 description voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.2 electrical characteristics vo ltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.3 application information for the setting the variable output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.4 typical performance characteristics voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 6 current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.1 electrical characteristics current consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6.2 typical performance graphs current cons umption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 7 current and protection monitor functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1 functional description current and protection monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1.1 linear current monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7.1.2 adjustable output current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.1.3 overvoltage detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.1.4 thermal shutdown detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.2 electrical characteristics current and protection monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8 enable function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8.1 description enable function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8.2 electrical characteristics enable functi on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 9 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 9.1 measurement circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 10 package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 11 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table of contents
pg-ssop14 ep type package marking TLF4277el pg-ssop14 ep TLF4277 data sheet 3 rev. 1.0, 2009-05-07 low drop out linear voltage regulator integrated current monitor TLF4277 1overview features ? integrated current monitor ? adjustable current limitation ? adjustable output voltage ? overvoltage detection ? output current up to 200 ma ? very low current consumption ? very low dropout voltage ? wide input voltage range up to 40 v ? reverse polarity protection ? short circuit protected ? overtemperature shutdown ? automotive temperature range -40 c t j 150 c ? green product (rohs and weee compliant) ? aec qualified description the TLF4277 is the ideal companion ic to supply active an tennas for car infotainment applications. the adjustable output voltage makes the TLF4277 capable of supplying the majority of standard active antennas such as: ?fm/am ?dab ?xm ? sirius the TLF4277 is a monolithic integrated low drop out volt age regulator capable of supplying loads up to 200 ma. for an input voltage up to 40 v the TLF4277 provides an ad justable output voltage in a range from 5 v up to 12 v. the integrated current monitor function is a unique feature that provides diagnosis and system protection functionality. fault conditions such as overtemperature and output overvoltag e are monitored and indicated at the current sense output. the maximum output current limit of the device is adjustable to provide additional protection to the connected load. via the enable function the ic can be disabled to lower the power consumption. the pg-ssop14 ep package provides an enhanced thermal pe rformance within a so8 body size.
TLF4277 block diagram data sheet 4 rev. 1.0, 2009-05-07 2 block diagram figure 1 block and simplified applicati on diagram TLF4277 (package pg-ssop14 ep) bandgap reference gnd q i b lockdiagram .vsd c q v bat regulated output voltage adj r cs 1 current monitor internal supply r shunt protection circuits cso c so c i load e.g. antenna amplifier r so TLF4277 cs1 en cs2
data sheet 5 rev. 1.0, 2009-05-07 TLF4277 pin configuration 3 pin configuration 3.1 pin assignment figure 2 pin configuration (top view) 3.2 pin definitions and functions pin symbol function 1cs2 current sense in 2 current monitor and power stage input 3cs1 current sense in 1 current monitor input 5i ic supply place a capacitor from i (pin 5) to g nd close to the ic for compensating line influences. 7cso current sense out current monitor and status output 8en enable high signal enables the regulator; low signal disables the regulator; connect to i, if the enable function is not needed 10 gnd ground connect pin to pcb and heat sink area 12 adj voltage adjust connect an external voltage divider to configure the output voltage 14 q regulator output connect a capacitor between q (pin 8) and gnd close to the ic pins, respecting the values given for its capacitance c q and esr in the table chapter 4.2 pad heat sink connect to pcb heat sink area and gnd 2,4,6 nc not connected internally not connected; connect to pcb gnd 9,11,13 nc not connected internally not connected; connect to pcb gnd 4 (1 1& *1' 1& $'- 1& &6 &62 1& , 1& &6 1& 7/)b3,1&21),*b662369*
TLF4277 general product characteristics data sheet 6 rev. 1.0, 2009-05-07 4 general product characteristics 4.1 absolute maximum ratings note: integrated protection functions are designed to prevent ic destruction under fault conditions described in the data sheet. fault conditions are considered as ?outside? normal operating range. protection functions are not designed for continuous repetitive operation. note: stresses above the ones listed her may cause perm anent damage to the device. exposure to absolute maximum rating conditions for extended periods may affect device reliability. absolute maximum ratings 1) t j = -40 c to +150 c; all voltages with respect to ground, positive current flowing into pin (unless otherwise specified) 1) not subject to production test, specified by design. pos. parameter symbol limit values unit conditions min. max. voltage ratings 4.1.1 ic supply i v i -42 45 v ? 4.1.2 enable input en v en -42 45 v ? 4.1.3 voltage adjust input adj v adj -0.3 10 v ? 4.1.4 regulator output q v q -1 40 v ? 4.1.5 current monitor input cs1 v cs1 -42 45 v ? 4.1.6 current monitor input cs2 v cs2 -42 45 v ? 4.1.7 current monitor out cso v cso -0.3 5 v ? temperatures 4.1.8 junction temperature t j -40 150 c? 4.1.9 storage temperature t stg -55 150 c? esd susceptibility 4.1.10 esd resistivity to gnd v esd -2 2 kv hbm 2) 2) esd susceptibility, hbm accord ing to aec-q-100-002-jesd22-a114 4.1.11 esd resistivity v esd -1 1 kv cdm 3) 3) esd susceptibility, charged device model ?cdm? esda stm5.3.1
data sheet 7 rev. 1.0, 2009-05-07 TLF4277 general product characteristics 4.2 functional range note: within the functional range the ic operates as de scribed in the circuit description. the electrical characteristics are specifi ed within the conditions given in the re lated electrical ch aracteristics table. 4.3 thermal resistance pos. parameter symbol limit values unit conditions min. max. 4.2.1 input voltage v i 540v? 4.2.2 input voltage power stage v cs2 vq + 0.5 40 v v q = v cs2 - v dr 4.2.3 differential input voltage v shunt 00.5v v shunt = v cs1 - v cs2 4.2.4 output voltage range v q 512v? 4.2.5 reference resistor r cs1 100 1000 ? 4.2.6 current sens e output resistor r cso 1k 5k ? 4.2.7 current sense output capacitor c cso 14.7f? 4.2.8 junction temperature t j -40 150 c? 4.2.9 output capacitor requirements c q 10 ? f ? 1) 1) the minimum output capacitance requ irement is applicable for a worst case capacitance tolerance of 30% 4.2.10 esr cq ?3 ? 2) 2) relevant esr value at f = 10 khz pos. parameter symbol limit values unit conditions min. typ. max. 4.3.1 junction to case... 1) r thjc ? ? 10 k/w measured to the exposed pad 4.3.2 junction to ambient 1) 1) not subject to production test, specified by design r thja ? 150 ? k/w footprint only 2) 2) specified r thja value is according to jedec jesd 51-3 at natural convection on fr4 1s0p board; the product (chip+package) was simulated on a 76.2 114.3 1.5 mm 3 board with 1 copper layer (1 x 70m cu). 4.3.3 ? 64 ? k/w 300 mm 2 pcb heat sink area 2) 4.3.4 ? 55 ? k/w 600 mm 2 pcb heat sink area 2) 4.3.5 ? 50 ? k/w 2s2p pcb 3) 3) specified r thja value is according to jedec jesd51-2,-5,-7 at natural convection on fr4 2s2p board; the product (chip+package) was simulated on a 76.2 x 114.3 x 1.5 mm3 bo ard with 2 inner copper layers (2 x 70m cu, 2 x 35m cu). where applicable a thermal via array under the ex posed pad contacted the first inner copper layer.
TLF4277 voltage regulator data sheet 8 rev. 1.0, 2009-05-07 5 voltage regulator 5.1 description voltage regulator the output voltage v q is controlled by comparing the feedback voltage ( v adj ) to an internal reference voltage and driving a pnp pass transistor acco rdingly. the control loop stability depends on the output capacitor c q , the output capacitor esr, the load current and the chip temperature. to ensure stable operation, the output capacitor?s capacitance and its equivalent series re sistor esr requirements given in the table 4.2 ?functional range? on page 7 have to be maintained. for stability details please refer to the typi cal performance graph ?output capacitor series resistivity esr cq ? on page 11 . in addition the output capacitor may need to be sized larger to buffer load transients. an input capacitor c i is not needed for the control loop stability, but recommended to bu ffer line influences. connect the capacitors close to the ic terminals. in general a buffered supply voltage is recommended for the device. for details see chapter 9 . protection circuitry prevents the ic as well as the applic ation from destruction in case of catastrophic events. the integrated safeguards consist of outpu t current limitation, reverse polarity protection as well as thermal shutdown in case of overtemperature. in order to avoid excessive power dissipation that coul d never be handled by the pass element and the package, an integrated safe operation monitor lowers t he maximum output current input voltages above v bat =22v. the thermal shutdown circuit prevents the ic from i mmediate destruction under fault conditions (e.g. output continuously short-circuited) by switching off the power stage. after the chip has cooled down, the regulator restarts. this leads to an oscillatory behavior of the output volt age until the fault is re moved. however, junction temperatures above 150 c are outside the maximum ratings and theref ore significantly reduce the ic lifetime. the TLF4277 allows a negative supply vo ltage. however, several small currents are flowin g into the ic increasing its junction temperature. this reverse current has to be considered for the thermal design, respecting that the thermal protection circuit is not operati ng during reverse polarity condition. figure 3 block diagram volt age regulator circuit bandgap reference gnd q cs2 blockdiagram_voltageregulator.vsd saturation control current limitation temperature shutdown c q load regulated output voltage i q i cs2 adj r 1 r 2
data sheet 9 rev. 1.0, 2009-05-07 TLF4277 voltage regulator 5.2 electrical character istics voltage regulator electrical characteristics: voltage regulator v bat = 13.5 v, t j = -40 c to +150 c, all voltages with respect to ground, direction of currents as shown in figure 7 ?measuring circuit? on page 19 (unless otherwise specified) pos. parameter symbol limit values unit conditions min. typ. max. 5.2.1 reference voltage v ref,int ?1.22?v 1) ? 1) parameter not subject to produ ction test; specified by design. 5.2.2 output voltage tolerance 2) 2) referring to the device tolerance only, the tolerance of the resistor divider can cause additional deviation. v q -2 ? 2 % 1 ma i q 200 ma; 9 v v bat 16 v 5.2.3 -2 ? 2 % 1 ma i q 150 ma; 6 v v bat 16 v 5.2.4 -2 ? 2 % 1 ma i q 100 ma; 16 v v bat 32 v 3) 3) see typical performance graph for details. 5.2.5 -2 ? 2 % 1 ma i q 10 ma; 32 v v bat 45 v 3) 5.2.6 load regulation steady-state d v q,load -30 -5 ? mv i q = 1 ma to 150 ma; v bat = 6 v v q = 5 v 5.2.7 line regulation steady-state d v q,line ?520mv v bat = 6 v to 32 v; i q = 5 ma v q = 5 v 5.2.8 power supply ripple rejection 1) psrr 60 65 ? db f ripple = 100 hz; v ripple = 1 vpp 5.2.9 dropout voltage v dr = v cs2 - v q v dr ? 120 250 mv i q = 50 ma 4) 4) measured when the output voltage v q has dropped 100 mv from its nominal value. 5.2.10 ? 250 500 mv i q = 150 ma 4) 5.2.11 output cu rrent limitation i q,max 300 ? 600 ma 0 v v q 0.95 * v q,nom ; cso pin connected to gnd 5.2.12 reverse current i q -2 -1 ? ma v bat = v cs2 = 0 v; v q = 5 v 5.2.13 reverse current at negative input voltage i bat -10 -6 ? ma v bat = -16 v; v q = 0 v 5.2.14 overtemperature shutdown threshold t j,sd 151 ? 200 c t j increasing 1) 5.2.15 overtemperature shutdown threshold hysteresis t j,hy ?25?k t j decreasing 1)
TLF4277 voltage regulator data sheet 10 rev. 1.0, 2009-05-07 5.3 application information for the setting the variabl e output voltage the output voltage of the TLF4277 can be adjusted between 5 v and 12 v by an external output voltage divider, closing the control loop to the voltage adjust pin adj. the voltage at pin adj is compared to the internal referenc e of typical 1.22 v in an erro r amplifier. it controls the output voltage. figure 4 application detail external components at output for variable voltage regulator the output voltage is calculated according to equation (1) : v q = ( r 1 + r 2 )/ r 2 x v ref,int , neglecting i adj (1) v ref,int is typically 1.22 v. to avoid errors caused by leakage current i adj , we recommend to choose the resistor value for r 2 < 27 k . the accuracy of the resistors for the exte rnal voltage divider can lead to a hig her tolerance of the output voltage.to achieve a reasonable accura cy resistors with a tolerance of 1% or lower are recommended for the feedback divider. bandgap reference gnd q b d_v oltageregulator _a djust.vsd saturation control current limitation c q i q adj r 1 r 2
data sheet 11 rev. 1.0, 2009-05-07 TLF4277 voltage regulator 5.4 typical performance characteristics voltage regulator reference voltage v ref,int vs. junction temperature t j dropout voltage v dr vs. output current i q output capacitor series resistivity esr cq vs. output current i q power supply ripple rejection psrr vref_tj.vsd t j [c] v ref,int [v] 1.20 1.21 1.22 1.23 -40 0 40 80 120 150 vdr-tj.vsd i q = 150 ma 300 200 v dr [mv ] 100 150 50 t j [ c ] 120 0 -40 40 80 150 i q = 50 ma esr-iq.vsd stable region unstable region 0 50 100 150 200 0,1 0,01 1 100 10 c q = 10 f t j = -40 ..150 c v i = 6..28 v i q [m a] esr(c q )[ ? ] psrr.vsd 0,01 0,1 1 10 f [k h z] psrr [db] 100 70 50 30 10 t j t j = 25 c t j = -40 c i q = 10 ma c q = 10 f ceramic v i = 13.5 v v ripple = 0.5 vpp = 150 c 100
TLF4277 current consumption data sheet 12 rev. 1.0, 2009-05-07 6 current consumption 6.1 electrical characteris tics current consumption electrical characteristics: current consumption v bat = 13.5 v, t j = -40 c to +150 c, all voltages with respect to ground; direction of currents as shown in figure 7 ?measuring circuit? on page 19 (unless otherwise specified) pos. parameter symbol limit values unit conditions min. typ. max. 6.1.1 current consumption i q,on ? 150 200 a i q 200 a; t j 25 c; v en = 5 v; i q = i i + i cs2 - i q 6.1.2 ? 175 250 a i q 200 a; t j 85 c; v en = 5 v; i q = i i + i cs2 - i q 6.1.3 ? 1.2 2.6 ma i q = 50 ma v en = 5 v; i q = i i + i cs2 - i q 6.1.4 ? 3.5 6 ma i q = 100 ma v en = 5 v; i q = i i + i cs2 - i q 6.1.5 ? 5 10 ma i q = 150 ma v en = 5 v; i q = i i + i cs2 - i q 6.1.6 current consumption i q,off ??3 a t j 25 c v en = 0.8 v i q = i i + i cs2 - i q 6.1.7 ? ? 5 a t j 85 c; v en = 0.8 v i q = i i + i cs2 - i q
data sheet 13 rev. 1.0, 2009-05-07 TLF4277 current consumption 6.2 typical performance gr aphs current consumption current consumption i q,off vs. junction temperature t j current consumption i q,on vs. output current i q current consumption i q,on vs. junction temperature t j iq,off-tj.vsd t j [ c ] 60 -20 -40 20 40 100 080 3,0 2,0 i q [a ] 1,0 1,5 0,5 v bat = 13.5 v v en = 0 .8 v iq-iq.vsd i q [m a] 40 0 80 120 160 4,5 2,0 i q [ma ] 1,0 1,5 0,5 2,5 3,0 t= 85c t= 25c v bat = 13.5 v v en = 5 v iq-tj(iq200a).vsd t j [c ] -40 40 080120150 300 250 i q [a ] 100 150 50 v bat = 13 .5 v v en = 5 v i q = 200 a
TLF4277 current and protection monitor functions data sheet 14 rev. 1.0, 2009-05-07 7 current and protection monitor functions 7.1 functional description curre nt and protection monitors the TLF4277 provides a set of advanc ed monitor functionality. the current flowing into the power stage can be monitored at the cso output. in addition the current limitati on can be adjusted via external resistors. events of the implemented protection functions are reported throug h dedicated voltage levels at the cso output. this information can be processed by an external c for system analysis and failure identification. the monitored events are over-current, overvolt age, and temperature shutdown. figure 5 block diagram current and protection monitor to reduce possible effects from the supply voltage v bat additional filtering in of the supply voltage is recommended. a combination of a 100 nf capacitor and an a dditional buffer capacitor of 10 f or higher should be placed as close a possible to th e ic terminal, which are connected to v bat . figure 6 shows the output level at the cso pi n versus the operation or fault cond ition. the graph is valid for the following set up of external components: r shunt = 1 r cs1 = 100 c cso = 2.2 f r cso = 1.5 k gnd c urrent _ monitor .vsd v bat r cs1 current monitor r shunt cso c cso r cso cs1 cs2 buffer ov- detection tsd-detection oc-detection m onitor circuits i cs2 i cs 1 i cso to power stage
data sheet 15 rev. 1.0, 2009-05-07 TLF4277 current and protection monitor functions figure 6 output levels and functionality of the cso output 1) 7.1.1 linear current monitor inside the linear current monitor area the current driven ou t of the cso pin is proportional to the voltage which is measured between pin cs1 and cs2. the level of the current i cso can be adjusted according to equation (2) : adjustment i cso (2) adjustment of the voltage level for v cso (3) 1) the graph is just an example and only valid for an certain configuration of the external components short circuit to v bat 3.1 v typical 163 170 i cs2 [ma] v cso [v] linear current sense band up to 2.45 v 0 3,2 3,0 2,95 2,65 2,45 thermal shut down 2.80 v typical current limitation and sc to gnd 2.55 v typical i cso v cs1 v cs2 ? r cs1 ----------------- -------------- i cs2 r shunt r cs1 ------------------- - == v cso v cs1 v cs2 ? () r cso r cs1 --------------------- ------------------ ---------------- -v shunt r cso r cs1 ------------- ==
TLF4277 current and protection monitor functions data sheet 16 rev. 1.0, 2009-05-07 7.1.2 adjustable output current limitation the TLF4277 has an adjustable current limitation for the cu rrent flowing into the power stage (pin cs2). if the level of the voltage drop across the sense resisto r r shunt is higher than the desired linear monitor range the output current of the tl f4277 will be limited. setting of the adjustab le current limitation (4) a voltage level as defined in table 7.2.6 on page 17 will be applied at the cso pin. to achieve a current limitation of 170ma the following configuration can be used: r shunt = 1 r cs1 = 100 r cso = 1.5k 7.1.3 overvoltage detection to detect a possible short circuit of the output to a higher supply rail the TLF4277 has an overvoltage detection implemented. an overvo ltage will be detected, if the vo ltage level at the adj pin is 20% higher than the internal reference voltage v ref,int defined in table 5.2.1 on page 9 . under this condition the cso pin will be driven through an internal voltage buffer with a voltage level as defined in table 7.2.7 on page 17 . 7.1.4 thermal shut down detection if the junction temperature will ex ceed the limits defined in the table 5.2.14 on page 9 the TLF4277 will disable the output voltage. in this case a voltage level as defined in table 7.2.8 on page 17 will be applied at the cso pin. i cs2,lim 2.55v r cs1 r shunt r cso --------------------- ----------------- - = i cs2,lim 2.55v 100 1 1.5k ---------------- ------------------ - 170ma ==
data sheet 17 rev. 1.0, 2009-05-07 TLF4277 current and protection monitor functions 7.2 electrical characteristics cu rrent and protection monitor electrical characteristic s: current monitor function v bat = 13.5 v, t j = -40 c to +150 c, all voltages with respect to ground, direction of currents as shown in figure 7 ?measuring circuit? on page 19 (unless otherwise specified) pos. parameter symbol limit values unit conditions min. typ. max. linear current monitor 7.2.1 current sense output current i cso ( v shunt = 10 mv) i cso 0.08 0.1 0.12 ma t j =25c r shunt = 1 r cs1 = 100 r cso = 1.5 k 1) 1) referring to the device tolerance only, the tolerance of the external components can cause additional deviation 7.2.2 ( v shunt = 50 mv) 0.47 0.5 0.53 ma 7.2.3 ( v shunt = 100 mv) 0.97 1 1.03 ma 7.2.4 ( v shunt = 150 mv) 1.45 1.5 1.55 ma adjustable current limitation 7.2.5 adjustable current limit i cs2,lim 162 170 187 ma r shunt = 1 r cs1 = 100 r cso = 1.5 k v q < 0,95 * v q,nom 1) 7.2.6 cso voltage level current limitation v cso,cur_lim 2.45 2.55 2.65 v output level overvoltage detected 7.2.7 cso voltage level overvoltage detected v cso,ov 3.0 3.1 3.2 v v adj > 1.2 * v ref,nom 1) output level overtemperature detected 7.2.8 cso voltage level overtemperature detected 2) 2) specified by design; not subject to production test v cso,tsd 2.65 2.8 2.95 v 150 c < t j < 180 c
TLF4277 enable function data sheet 18 rev. 1.0, 2009-05-07 8 enable function 8.1 description enable function the TLF4277 can be turned on or turned off via the en input. with voltage levels higher than v en,high applied to the en input the device will be complete ly turned on. a volt age level lower than v en,low sets the device to low quiescent current mode. in this condition the device is turned off and is not functional. the enable input has an build in hysteresis to avoid toggling between on/off state, if signals with slow slope are applied to the input. 8.2 electrical character istics enable function electrical characteristics: enable function v bat = 13.5 v, t j = -40 c to +150 c, all voltages with respect to ground, direction of currents as shown in figure 7 ?measuring circuit? on page 19 (unless otherwise specified) pos. parameter symbol limit values unit conditions min. typ. max. 8.2.1 enable low signal valid v en,low ??0.8v? 8.2.2 enable high signal valid v en,high 2??v v q settled 8.2.3 enable threshold hysteresis v en,hyst 50??mv? 8.2.4 enable input current i en ??2a v en = 5 v 8.2.5 enable internal pull-down resistor r en 34.56m ?
data sheet 19 rev. 1.0, 2009-05-07 TLF4277 application information 9 application information 9.1 measurement circuit figure 7 measuring circuit measurement set up: r shunt = 1 r cs1 = 100 c cso = 2.2 f r cso = 1.5 k r 1 = 38 k r 2 = 12 k c q = 10 f gnd q i measuring _circuit. vsd c q adj r cs1 current monitor internal supply r shunt cso c so c i r so TLF4277 cs1 en cs2 r l r 1 r 2 v adj i q v cso v en i en i i i cso v q i cs1 i cs2 v shunt v bat i bat i adj monitor circuits
TLF4277 package outlines data sheet 20 rev. 1.0, 2009-05-07 10 package outlines figure 8 pg-ssop14 ep green product (rohs compliant) to meet the world-wide customer requirements for environmentally friendly products and to be compliant with government regulations the device is available as a green product. green products are rohs-compliant (i.e pb-free finish on leads and suitable for pb-free soldering according to ipc/jedec j-std-020). pg-ssop-14-1,-2,-3-po v02 1 7 14 8 14 17 8 14x 0.25 ?.05 2) m 0.15 d c a-b 0.65 c stand off 0 ... 0.1 (1.45) 1.7 max. 0.08 c a b 4.9 ?.1 1) a-b c 0.1 2x 1) does not include plastic or metal protrusion of 0.15 max. per side 2) does not include dambar protrusion bottom view ?.2 3 ?.2 2.65 0.2 ?.2 d 6 m d 8x 0.64 ?.25 3.9 ?.1 1) 0.35 x 45? 0.1 cd +0.06 0.19 8 ? max. index marking exposed diepad for further information on infineon packages, please visit our website: http://www.infineon.com/packages . dimensions in mm
data sheet 21 rev. 1.0, 2009-05-07 TLF4277 revision history 11 revision history revision date changes 1.0 2009-05-07 data sheet
edition 2009-05-07 published by infineon technologies ag 81726 munich, germany ? 2009 infineon technologies ag all rights reserved. legal disclaimer the information given in this docu ment shall in no event be regarded as a guarantee of conditions or characteristics. with respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, infine on technologies hereby disclaims any and all warranties and liabilities of any kind, including witho ut limitation, warranties of non-infrin gement of intellectua l property rights of any third party. information for further information on technology, delivery terms and conditions and prices, please contact the nearest infineon technologies office ( www.infineon.com ). warnings due to technical requirements, components may contain dangerous substances. for information on the types in question, please contact the nearest infineon technologies office. infineon technologies compon ents may be used in life-su pport devices or systems only with the express written approval of infineon technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system or to affect the safe ty or effectiveness of that de vice or system. life support devices or systems are intended to be implanted in the hu man body or to support an d/or maintain and sustain and/or protect human life. if they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

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