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october 2011 doc id 022313 rev 1 1/16 16 L6370Q 2.5 a single high-side smart power switch features 2.5 a output current 9.5 v to 35 v supply voltage range internal current limiting thermal shutdown open ground protection internal negative voltage clamping to v s - 50 v for fast demagnetization differential inputs wit h large common mode range and threshold hysteresis undervoltage lockout with hysteresis open load detection two diagnostic outputs output status led driver non dissipative short circuit protection protection against and surge transient (iec61000-4-5) immunity against burst transient (iec61000-4- 4) esd protection (human body model 2kv) applications programmable logic control industrial pc peripheral input/output numerical control machines drivers for all type of loads (resistive, capacitive, inductive load) description the l6370 is a monolithic intelligent power switch in multipower-bcd technology, for driving inductive or resistive loads. an internal clamping diode enables the fast demagnetization of inductive loads. diagnostic for cpu feedback and extensive use of electrical protections make this device extremely rugged and specially suitable for industrial automation applications. type v demag rdson iout vs L6370Q vs-50 v 0.1 2.5 a 50 v qfn-48 (7 x 7 mm) table 1. device summary part number package packaging L6370Q vfqfpn 7x7x1 4 8 l tube L6370Qtr tape and reel www.st.com
contents L6370Q 2/16 doc id 022313 rev 1 contents 1 block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 ac operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 diagnostic truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 input section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 diagnostic logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.4 short circuit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.5 overtemperature protection (ovt) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.6 undervoltage protection (uv) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.7 demagnetization of inductive loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
L6370Q block diagram and pin description doc id 022313 rev 1 3/16 1 block diagram and pin description figure 1. block diagram figure 2. pin connection (top view) under voltage charge pump driver non dissipative short circuit current limitation open load detection outstatus diagnostic thermal protection osc + - 1.4v input in+ in- on-delay output status 3ma diag2 diag1 out v s d95in208d rsc 287387 287387 287387 1& 1& 9v 1& 9v 9v 9v 21'(/$< 1& 1& 1& 1& 1& 1& 1& ,1 ,1 ',$* ',$* 1& 1& 1& 1& 1& 1& 1& 1& 1& 1& *1' 28767$786 1& 1& 1& 1& 1& 1& 1& 1& 1& 1& 56& 1& 1& 287387
block diagram and pin description L6370Q 4/16 doc id 022313 rev 1 1.1 pin description table 2. pin description pin n name description 1 output high side output with built-in current limitation 2 output high side output with built-in current limitation 3 nc not connected 4 on-delay programmable on time interval duration during short circuit operation 5v s supply voltage input, the value of the supply voltage is monitored to detect under voltage condition 6v s supply voltage input, the value of the supply voltage is monitored to detect under voltage condition 7v s supply voltage input, the value of the supply voltage is monitored to detect under voltage condition 8 v s supply voltage input, the value of the supply voltage is monitored to detect under voltage condition 9 nc not connected 10 output high side output with built-in current limitation 11 output high side output with built-in current limitation 12 nc not connected 13 nc not connected 14 nc not connected 15 nc not connected 16 nc not connected 17 nc not connected 1 8 nc not connected 19 nc not connected 20 nc not connected 21 nc not connected 22 rsc current limitation setting. 23 nc not connected 24 nc not connected 25 nc not connected 26 nc not connected 27 nc not connected 2 8 diag1 diagnostic 1 output. this open drain reports the ic working conditions. (see diagnostic truth table 6. )
L6370Q block diagram and pin description doc id 022313 rev 1 5/16 29 diag2 diagnostic 2 output. this open drain reports the ic working conditions. (see diagnostic truth table 6. ) 30 nc not connected 31 nc not connected 32 nc not connected 33 in+ comparator inverting input 34 in- comparator non inverting input 35 nc not connected 36 nc not connected 37 nc not connected 3 8 outstatus this current source output is capable of driving a led to signal the status of the output pi n. the pin is active (source current) when the output pin is considered high 39 nc not connected 40 nc not connected 41 gnd ground 42 nc not connected 43 nc not connected 44 nc not connected 45 nc not connected 46 nc not connected 47 nc not connected 4 8 nc not connected table 2. pin description (continued) pin n name description
electrical specifications L6370Q 6/16 doc id 022313 rev 1 2 electrical specifications 2.1 absolute maximum ratings 2.2 thermal data table 3. absolute maximum ratings symbol parameter value unit vs supply voltage (tw<10ms) 50 v vs-vo supply to output differential voltage. see also vcl internally limited v vod externally forced voltage -0.3 to 7 v iod externally forced current 1 ma vin input voltage -10 to vs+10 v vi differential input voltage 43 v iin input current 20 ma iout output current. see also isc internally limited a ei energy inductive load t j = 8 5c 1 j p tot power dissipation. se also thermal characteristics internally limited w top operating temperature range -25 to + 8 5c t stg storage temperature -55 to 150 c table 4. thermal data symbol description value unit r thjc thermal resistance junction to case max. 4 c/w r thja thermal resistance junction to ambient (1) 1. mounted on a 2-side + vias pcb with a ground dissipating area on the bottom side. max. 50
L6370Q electrical specifications doc id 022313 rev 1 7/16 2.3 electrical characteristics (v s = 24 v; t j = ?25 to +125c, unless otherwise specified) table 5. electrical characteristics symbol parameter test condition min. typ. max. unit v smin supply voltage for valid diagnostics i diag > 0.5ma; v dg1 = 1.5v 4 35 v v s supply voltage (operative) 9.5 24 35 v i q quiescent current i out = i os = 0 v il v ih 0. 8 3 1.4 4 ma v sth1 undervoltage threshold 1 (see figure 4 ), t amb = 0 to + 8 5c 8 .599.5v v sth2 undervoltage threshold 2 88 .5 9 v v sth3 supply voltage hysteresis 300 500 700 mv i sc short circuit current v s = 9.5 to 35v; r l = 2 5k < r sc < 30k 15/r sc (k )a 0< r sc < 5k 2.6 3.2 4 a v don output voltage drop i out = 2.0a, t j = 25c t j = 125c 200 320 2 8 0 440 mv i out = 2.5a, t j = 25c t j = 125c 250 400 350 550 mv i oslk output leakage current v i = v il ; v o = 0v 500 a v ol low state out voltage v i = v il ; r l = 0. 8 1.5 v v cl internal voltage clamp (v s - v o ) i o = 1a single pulsed: t p = 300 s 4 8 53 5 8 v i old open load detection current v i = vi h ; t amb = 0 to + 8 5 c 1 3 6 ma v id common mode input voltage range (operative) v s = 1 8 to 35v - 7 15 v i ib input bias current v i = -7 to 15v; -in = 0v -2 50 250 a v ith input threshold voltage v +in > v -in 0. 8 1.4 2 v v iths input threshold hysteresis voltage v +in > v -in 50 400 mv r id diff. input resistance 0 < +in < +16v; -in = 0v -7 < +in < 0v; -in = 0v 400 150 k i ilk input offset current v +in = v -in +ii 0v < vi < 5.5v -ii -20 -75 -25 +20 a -in = gnd +ii 0v < v+in <5.5v -ii -250 +10 -125 +50 +in = gnd +ii 0v < v-in <5.5v -ii -100 -50 -30 -15
electrical specifications L6370Q 8 /16 doc id 022313 rev 1 note: v il 0.8v, v ih 2v @ (v+in > v-in) 2.4 ac operation v oth1 output status threshold 1 voltage (see figure 3 ) 4.555.5v v oth2 output status threshold 2 voltage 44.55.0v v ohys output status threshold hysteresis 300 500 700 mv i osd output status source current v out > v oth1 ; v os = 2.5v 2 4 ma v osd active output status driver drop voltage v s - v os ; i os = 2ma t amb = 0 to + 8 5c 1.5 3 v i oslk output status driver leakage current v out < v oth2 ; v os = 0v v s = 9.5 to 35v 25 a v dgl diagnostic drop voltage d1 / d2 = l; idiag= 0.5ma d1 / d2 = l; idiag= 3ma 40 250 mv i dglk diagnostic leakage current d1 / d2 = h; 0 < vdg < v s v s = 9.5 to 35v 5 a source drain ndmos diode v fsd forward on voltage @ i fsd = 2.5a 1 1.5 v i fp forward peak current t = 10ms; d = 20% 6 a t rr reverse recovery time i f = 2.5a di/dt = 25a/ s 200 ns t fr forward recovery time 100 ns thermal characteristics lim junction temp. protect. 135 150 c th thermal hysteresis 20 c table 6. ac operation symbol parameter test co ndition min. typ. max. unit t r - t f rise or fall time v s = 24v; r i = 70 ; r l to ground 20 s t d delay time 5 s dv/dt slew rate (rise and fall edge) 0.7 1 1.5 v/ s t on on time during short circuit condition 50pf < c don < 2nf 1.2 8 s/pf t off of time during short circuit condition 64 t on f max maximum operating frequency 25 khz table 5. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
L6370Q circuit description doc id 022313 rev 1 9/16 3 circuit description figure 3. output status hysteresis figure 4. undervoltage comparator hysteresis figure 5. switching waveforms v out d95in211a v oth1 v ohy s v oth2 v s d95in212 v s th1 v s th 3 v s th2 50% 50% t d t d t 90% 90% 10% 10% t f t r t v in v out d94in127a 50% 50%
circuit description L6370Q 10/16 doc id 022313 rev 1 3.1 diagnostic truth table 3.2 input section the input section is an high impedance differen tial stage with high common and differential mode range. there?s built-in offset of +1.4 v (typical value) and an hysteresis of 400 mv (maximum value), to ensure high noise immunity. 3.3 diagnostic logic the operating conditions of the device are permanently monitored and the following occurrences are signalled via the diag1/diag2 open-drain output pins: short circuit versus ground. a current limiting circuit fixes at i sc = 3.2 a (typical value) the maximum current that can be sourced from the output pin (for more details see short circuit operation section). short circuit versus vs. under voltage (uv) over temperature (ovt) open load, if the output current is less than 3 ma (typical value). output dmos open according to the diagnostic truth ta bl e 7 . table 7. diagnostic truth table diagnostic conditions input output diag1 diag2 normal operation l h l h h h h h open load condition (i o < i old ) l h l h h l h h short to v s l h h h l l h h short circuit to ground (i o = i sc ) (1) (pin on-delay grounded) 1. a cold lamp filament, or a capacitive load may activate the current limiting circuit of the ips, when the ips is initially turned on. h l x l h h h h output dmos open l h l l h l h h overtemperature l h l l h h l l supply undervoltage (v s < v sth2 ) l h l l l l l l
L6370Q circuit description doc id 022313 rev 1 11/16 3.4 short circuit operation in order to minimize the power dissipation when the output is shorted to grounded, an innovative, non dissipative short circuit prot ection (patent pending) is implemented, avoiding, thus the intervention of the thermal protection in most cases. whenever the output is shorted to ground, or, generally speaking, an overcurrent is sinked by the load, the output devices is driven in linear mode, sourcing the isc current (typically 3.2 a) for a time interval (ton) defined by means of the external con capacitor connected between the ondelay pin and gnd. whether the short circuit crease within the ton interval the diag2 output status is not affected, acting as a programmable diagnostic delay. this function allow the device to drive a capacitive load or a filament lamp (that exhibits a very low resistance during the initial heading phase) without the intervention of the diagnostic. if the short circuit lasts for the whole t on interval, the output dmos is switched off and the diag2 goes low, for a time interval t off lasting 64 times t on . at the end of the t off interval if the short circuit condition is still present, the output dmos is turned on (and the diag2 goes high - see figure 7 ) for another t on interval and the sequence starts again, or, whether not, the normal condition operation is resumed. the t on interval can be set to lasts between 64 ms and 2.56 ms for a c on capacitor value ranging between 50 pf and 2 nf to have: t on ( s) = 1.2 8 c on (pf) if the on-delay pin is grounded the non dissipat ive short circuit protection is disabled, and the isc current is delivered until the overtemperature protection shuts the device off. the behaviour of the diag2 output is, in this situation, showed in the diagnostic truth ta bl e 7 . 3.5 overtemperatur e protection (ovt) if the chip temperature exceeds qlim (measured in a central position in the chip) the chip deactivates itself. the following actions are taken: all the output stage is switched off; the signal diag2 is activated (active low). normal operation is resumed as soon as (typically after some seconds) the chip temperature monitored goes back below lim - h . the different thresholds with hysteretic behavior assure that no intermittent conditions can be generated. 3.6 undervoltage protection (uv) the supply voltage is expected to range from 9.5 v to 35 v, even if its reference value is considered to be 24 v. in this range the device operates correctly. below 9.5 v the overall system has to be considered not reliable. protection will thus shut off the output whenever the supply voltage falls below the mask fixed by the v sth1 (9 v typ.) and v sth2 ( 8 .5 v typ.).
circuit description L6370Q 12/16 doc id 022313 rev 1 the hysteresis (see figure 4 ) ensures a non intermittent behav ior at low supply voltage with a superimposed ripple. the under voltage status is signalled via the diag1 and diag2 outputs (see the diagnostic truth ta bl e 7 ). 3.7 demagnetization of inductive loads an internal zener diode, limiting the voltage across the power mos to between 50 and 60 v (v cl ), provides safe and fast demagnetization of inductive loads without external clamping devices. the maximum energy that can be absor bed from an inductive load is specified as 1j (at t j = 8 5c) (see ta bl e 3 ). figure 6. l6370 short circuit operation waveforms figure 7. inductive load equivalent circuit 50v l +v s i s v s rl i o output d95in215a
L6370Q package mechanical data doc id 022313 rev 1 13/16 4 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack? packages, depending on their level of environmental compliance. ecopack? specifications, grade definitions and product status are available at: www.st.com . ecopack? is an st trademark. table 8. vfqfpn48 (7 x 7 x 1.0 mm) package mechanical data dim. (mm) min. typ. max. a 0. 8 0 0.90 1.00 a1 0.02 0.05 a2 0.65 1.00 a3 0.25 b 0.1 8 0.23 0.30 d 6. 8 5 7.00 7.15 d2 4.95 5.10 5.25 e 6. 8 5 7.00 7.15 e2 4.95 5.10 5.25 e 0.45 0.50 0.55 l 0.30 0.40 0.50 ddd 0.0 8
package mechanical data L6370Q 14/16 doc id 022313 rev 1 figure 8. vfqfpn48 (7 x 7 x 1.0 mm) package mechanical drawing
L6370Q revision history doc id 022313 rev 1 15/16 5 revision history table 9. document revision history date revision changes 04-oct-2011 1 initial release.
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