1 www.semtech.com sc1301a/b 2a high speed low-side mosfet driver in sot-23 power management revision: may 30, 2007 description features applications typical application circuit the sc1301a/b is a cost effective single-channel high- speed mosfet driver. the driver is capable of driving a 1000pf load in 20ns rise/fall time and has a 60ns propa- gation delay time from input transition to the gate of the power mosfet. the high current driving capability (2a peak) allows fast switching up to 1mhz. the sc1301a is noninverting and the sc1301b is inverting. an undervoltage lockout circuit is included to guarantee that the driver output is low when vcc is less than or equal to 4.1v (typ) at supply ramp up. an internal tem- perature sensor shuts down the driver in the event of overtemperature. the 5-pin sot-23 package uses mini- mum space. ? +4.5v to +16.5v operation ? fast rise and fall times (20ns typical with 1000pf load ) ? 2a peak drive current ? enable/disable control ? ttl-compatible input ? inverting or noninverting versions ? undervoltage lockout ? low supply current ? -40c to 85c ambient temperature operating range ? over temperature protection ? esd protection ? sot-23-5 package. also available in lead-free, fully weee and rohs compliant. ? switch-mode power supplies ? battery powered applications ? solenoid and motor drives sc1301a 3 1 4 2 5 vcc in out gnd en vload input 10uf load 0.1uf +12v
2 ? 2007 semtech corp. www.semtech.com sc1301a/b preliminary power management absolute maximum ratings unless otherwise specified: t a = 25c, v cc = 12v, v in = 5v, v en = 5v r e t e m a r a pl o b m y ss n o i t i d n o cn i mp y tx a ms t i n u t n e r r u c y l p p u s t n e r r u c t n e c s e i u qi q v n i a 1 0 3 1 c s r o f v 0 =0 . 30 . 4a m v n i b 1 0 3 1 c s r o f v 5 =0 . 30 . 4 t u o k c o l e g a t l o v - r e d n u e g a t l o v d l o h s e r h tv c c 9 . 31 . 44 . 4v e l b a n e e g a t l o v e l b a n ev n e v < 0 n e c c v <0 . 2v e g a t l o v e l b a s i dv n e v < 0 n e c c v <8 . 0v t u p t u o o t y a l e dt n e _ d h g i h o t w o l m o r f n e0 6s n t u p t u o o t y a l e dt s i d _ d w o l o t h g i h m o r f n e0 4s n t n e r r u c t u p n i e l b a n ei n e v < 0 n e c c v <52 1a t u p n i e g a t l o v t u p n i l e v e l h g i hv h i v < 0 n i c c v <0 . 2v e g a t l o v t u p n i l e v e l w o lv l i v < 0 n i c c v <8 . 0v t n e r r u c t u p n ii n i v < 0 n i c c v <52 1a r e t e m a r a pl o b m y sx a ms t i n u e g a t l o v y l p p u sc c v0 2 o t 3 . 0 -v e g a t l o v y l p p u s g n i t a r e p oc c v5 . 6 1 o t 3 . 0 -v e g a t l o v t u p n iv n i c c v o t 3 . 0 -v e g a t l o v e l b a n ev n e c c v o t 3 . 0 -v n o i t a p i s s i d r e w o p s u o u n i t n o cd pd e t i m i l y l l a n r e t n iw t n e i b m a o t n o i t c n u j e c n a t s i s e r l a m r e h t 0 6 2w / c e g n a r e r u t a r e p m e t g n i t a r e p ot a 5 8 + o t 0 4 -c e g n a r e r u t a r e p m e t e g a r o t st g t s 0 5 1 + o t 5 6 -c c e s 0 1 ) g n i r e d l o s ( e r u t a r e p m e t d a e lt d a e l 0 6 2c ) l e d o m y d o b n a m u h ( g n i t a r d s ed s e3v k dc electrical characteristics exceeding the specifications below may result in permanent damage to the device, or device malfunction. operation outside of th e parameters specified in the electrical characteristics section is not implied.
3 ? 2007 semtech corp. www.semtech.com sc1301a/b power management timing diagrams r e t e m a r a pl o b m y ss n o i t i d n o cn i mp y tx a ms t i n u e m i t e s i rt r m a r g a i d g n i m i t e e s0 2s n e m i t l l a ft f m a r g a i d g n i m i t e e s0 2s n e m i t y a l e d n o i t a g a p o r pt 1 d m a r g a i d g n i m i t e e s0 6s n e m i t y a l e d n o i t a g a p o r pt 2 d m a r g a i d g n i m i t e e s0 6s n ac electrical characteristics unless otherwise specified: t a = 25c, v cc = 12v , v en = 5v, c l = 1000pf r e t e m a r a pl o b m y ss n o i t i d n o cn i mp y tx a ms t i n u t u p t u o t n e r r u c k a e p t u p t u oi e c r u o s _ k p v t u o t , v 5 . 0 = w p , s 0 1 < e s l u p e l g n i s 2a i k n i s _ k p v t u o t , v 5 . 0 - c c v = w p , s 0 1 < e s l u p e l g n i s 2a n w o d t u h s l a m r e h t t n i o p p i r t e r u t a r e p m e t r e v ot t o _ j 0 5 1c dc electrical characteristics (cont.) unless otherwise specified: t a = 25c, v cc = 12v , v in = 5v, v en = 5v 90% 10% 90% 10% 90% 10% 10% 90% 10% 90% t r t f t f t r t d1 t d2 input non-inverted output sc1301a inverted output sc1301b 0v 5v
4 ? 2007 semtech corp. www.semtech.com sc1301a/b preliminary power management pin descriptions pin configuration ordering information # n i pe m a n n i pn o i t c n u f n i p 1n i. r e v i r d e h t o t l a n g i s t u p n i e l b i t a p m o c - l t t . d n g e h t o t t u o e h t s e c r o f w o l c i g o l . c c v e h t o t t u o e h t s e c r o f h g i h c i g o l : a 1 0 3 1 c s . c c v e h t o t t u o e h t s e c r o f w o l c i g o l . d n g e h t o t t u o e h t s e c r o f h g i h c i g o l : b 1 0 3 1 c s 2d n g. d n u o r g 3c c v . w o l d l e h s i t u p t u o e h t , o l v u g n i r u d . y l p p u s v 5 . 6 1 + o t v 5 . 4 + : y l p p u s 4t u o. t e f s o m g n i h c t i w s e h t r o f e v i r d e t a g t u p t u o 5n e e h t , n e p o t f e l n e h w . w o l s i t u p t u o e h t , w o l n e v i r d s i n e e h t n e h w . l o r t n o c e l b a s i d / e l b a n e . w o l s i t u p t u o r e b m u n t r a pk r a m p o te g a k c a p ) 1 ( r t k s i a 1 0 3 1 c s a 0 j a5 - 3 2 - t o s t r t k s i a 1 0 3 1 c s ) 2 ( r t k s i b 1 0 3 1 c s b 0 j a5 - 3 2 - t o s t r t k s i b 1 0 3 1 c s ) 2 ( notes: (1) only available in tape and reel packaging. a reel contains 3000 devices. (2) lead-free product. this product is fully weee and rohs compliant. top view (sot-23-5l) ttl input driver bias ttl input in en gnd sc1301a bias pre vcc out bandgap sc1301b gnd in ttl input bias ttl input en bias pre bandgap driver out vcc block diagrams
5 ? 2007 semtech corp. www.semtech.com sc1301a/b power management applications information the sc1301a/b is a high speed, high peak current mosfet driver. it is designed to drive power mosfets with ultra-low rise/fall time and propagation delays. as the switching frequency of pwm controllers is increased to reduce power converters volume and cost, fast rise and fall times are necessary to minimize switching losses. while discrete solutions can achieve reasonable drive capability, implementing delay and other housekeeping functions necessary for safe operation can become cumbersome and costly. the sc1031a/b presents a total solution for the high-speed, high power density applications. a wide input supply range of 4.5v - 16.5v allows operation in battery powered applications as well as distributed power systems. supply bypass and layout a 4.7f to 10f tantalum bypass capacitor with low esr (equivalent series resistance) and an additional 0.1f ceramic capacitor in parallel are recommended to con- trol switching and supply transients. low esr (equiva- lent series resistance) metalized film capacitors may also be used. as with any high speed, high current circuit, proper layout is critical in achieving optimum performance of the sc1301a/b. attention should be paid to the proper placement of the driver, the switching mosfet and the bypass capacitors. the driver should be placed as close as possible to elimi- nate the possibility of oscillation caused by trace induc- tance and the mosfet gate capacitance. a resistor in the range of 10 ? could be used in series with the gate drive to damp the ringing if the drive output path is not short enough. the bypass capacitors should be also placed closely between vcc and gnd of the driver. a schottky diode may be connected between the ground and the output pin to avoid latch-up in some applica- tions. drive capability and power dissipation the sc1301a/b is able to deliver 2a peak current typi- cally for driving a capacitive load, such as a mosfet. this high peak current will charge the input capacitance of the device to turn on quickly. a similar amount of cur- rent is needed to discharge the capacitance to ground to turn the device off. using the sc1301a/b for fast switching actions, such as turning on or turning off the capacitive load will signifi- cantly reduce the device switching loss for high frequency applications. accordingly, the thermal stress and reliabil- ity of the device can be improved. due to the non-linear characteristics of the input capaci- tance of a device, the test load for the sc1301a/b is a capacitor. thus, the power from the bias power supply can be calculated based on this setup. the energy, which is required to charge the capacitor for turning on pro- cess, is calculated by: 2 on v c 2 1 e ? ? = where, c is the load capacitance and v is the voltage applied to the driver. during the turning off process, the same amount of en- ergy will be dissipated in the resistive elements in the gate drive. therefore, the energy for one switching ac- tion (one turning on and one turning off) will be as follows: 2 total v c e ? = the power dissipation due to the gate driving switching is calculated by: 2 gate v c f p ? ? = where, f is switching frequency for a given application. below is an example to calculate the power dissipation for the given application. with v cc = 12v, c = 1nf and f = 200khz, the power loss for the gate switching actions will be as: ()()() mw 29 12 nf 1 khz 200 p 2 gate = ? ? = the power supply current will be: ma 4 . 2 v 12 mw 29 v p i cc gate = = =
6 ? 2007 semtech corp. www.semtech.com sc1301a/b preliminary power management thermal information the lifetime and performance of a driver is basically de- termined by the drive power requirements of the load, the thermal characteristics of the driver package and its cooling method. the driver?s junction temperature must be kept within the rated limit at all times. the application system has to effectively remove the heat generated in the driver in order for proper functions and performance. if the junction temperature reaches 150 o c, the internal protection circuit will be triggered to shut down the gate driver. as shown in the power derating table, the sc1301a/b has a power limit of 385mw when the ambient tempera- ture is less than 25 o c. as the ambient temperature reaches 85 o c, the allowed maximum power dissipation for the driver will be 154mw. when the ambient tem- perature is somewhere between 25 o c and 85 o c, the power dissipation for the driver should be derated ac- cording to the table. for each degree increasing of the ambient temperature, 3.85mw decreasing should be applied to the driver power dissipation. possible cooling methods may include using big pads, natural air-cooling by a careful layout and forced air-cooling if necessary. applications information (cont.) e l b a t g n i t a r e d r e w o p t a c 5 2 = 7 ? 2007 semtech corp. www.semtech.com sc1301a/b power management typical characteristics supply current vs vcc 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 3.5 5.5 7.5 9.5 11.5 13.5 15.5 vcc (v) supply current (ua) en = i np ut = vcc ta = 25c en = i np ut = 0v en = v cc, i np ut = 0v en = 0v , i np ut = vcc supply current vs temperature 2000 2500 3000 3500 4000 4500 5000 5500 -40 -20 0 20 40 60 80 100 120 temperature (c) supply current (ua) vcc = 12v en = i np ut = 0v en = 0v , i np ut = vcc en = vcc, i np ut = 0v en = i np ut = vcc uvlo vs temperature 3.850 3.900 3.950 4.000 4.050 4.100 4.150 4.200 4.250 4.300 -40 -20 0 20 40 60 80 100 120 temperature (c) uvlo (v) enable threshold voltage vs temperature 1.00 1.10 1.20 1.30 1.40 1.50 1.60 1.70 1.80 -40 -20 0 20 40 60 80 100 120 te mpe rature (c) enable threshold voltage (v) vcc = 12v, vin = 5v en a b le d disabled input threshold voltage vs temperature 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.20 2.40 -40 -20 0 20 40 60 80 100 120 te mpe rature (c) input threshold voltage (v) high vcc = 12v, ven = 5v low enable input current vs vcc 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 4.5 6.5 8.5 10.5 12.5 14.5 16.5 vcc (v) enable input current (ua) in pu t = v c c in pu t = 0 v
8 ? 2007 semtech corp. www.semtech.com sc1301a/b preliminary power management typical characteristics (cont.) enable input current vs temperature 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 -40 -20 0 20 40 60 80 100 120 temperature (c) enable input current (ua) vcc = 12v in pu t = v c c in pu t = 0 v input current vs vcc 0 1 2 3 4 5 6 7 8 4.5 6.5 8.5 10.5 12.5 14.5 16.5 vcc (v) input current (ua) en = v c c en = 0 v t a = 25c input current vs temperature 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 -40 -20 0 20 40 60 80 100 120 temperature (c) input current (ua) vcc = 12v en = v c c en = 0 v
9 ? 2007 semtech corp. www.semtech.com sc1301a/b power management outline drawing - sot-23-5 semtech corporation power management products division 200 flynn road, camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804 contact information .110 bsc .037 bsc detail aaa c seating plane c ccc c 2x n/2 tips 2x e/2 5 see detail a1 a a2 bxn d a .008 12 n e1 e d .060 .114 .063 .118 .010 - 5 a 0.20 1.60 3.00 2.80 bsc 0.95 bsc .069 1.50 2.90 .020 0.25 1.75 0.50 - ei l (l1) c 01 0.25 plane gage h 2.80 .110 bbb c a-b d a b e 0 .008 - .004 .012 .003 (.024) .018 - .035 .000 .035 - - .045 0.10 0.20 10 0 - 10 1.15 (0.60) 0.45 .024 .009 0.30 0.08 .057 .051 .006 0.00 .90 0.90 0.22 0.60 - 0.15 1.45 1.30 - - 1.90 bsc .075 bsc dimensions "e1" and "d" do not include mold flash, protrusions datums and to be determined at datum plane or gate burrs. controlling dimensions are in millimeters (angles in degrees). notes: 1. 3. 2. -a- -b- -h- dimensions inches l1 aaa bbb ccc 01 n dim e e1 l e e1 c d a a2 b a1 min nom millimeters nom max min max side view land pattern - sot-23-5 dimensions inches y z dim g p x c millimeters p (c) z y g .043 .141 .055 (.098) .037 .024 1.40 (2.50) 0.95 0.60 1.10 3.60 x dimensions inches y z dim g p x c millimeters this land pattern is for reference purposes only. consult your manufacturing group to ensure your company's manufacturing guidelines are met. notes: 1.
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