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motorola semiconductor technical data this document contains certain information on a new product. specifications and information herein are subject to change without notice. ? motorola, inc. 2003 33997 simplified application diagram document order number: mc33997/d rev 3.0, 03/2003 33997 advance information switching power supply with linear regulators the 33997 is a medium-power, multi-out put power supply integrated circuit that is capable of operating over a wide input voltage range, from 6.0 v up to 26.5 v with 40 v transient capability. it incorporates a sensorless current mode control step-down switching controlle r regulating directly to 5.0 v. the 3.3 v linear regulator uses an external pass transistor to reduce the 33997 power dissipation. the 33997 also provid es a 3.3 v linear standby regulator and two 5.0 v sensor supply outputs protected by internal low-resistance ldmos transistors. there are two separate enable pins for the main and sensor supply outputs and standard supervisory functions such as resets with power-up reset delay. the 33997 provides proper power supply sequencing for advanced microprocessor architectures such as the motorola mpc5xx and 683xx microprocessor families. features ? operating voltage range 6.0 v up to 26.5 v (40 v transient) ? step-down switching regulator output v ddh = 5.0 v @ 1400 ma (total) ? linear regulator with external pass transistor v ddl = 3.3 v @ 400 ma ? low-power standby linear regulator v kam = 3.3 v @ 10 ma ? two 5.0 v @ 200 ma (typical) sensor supplies v ref protected against short-to-battery and short-to-ground with retry capability ? undervoltage shutdown on the v ddl , v ddh outputs with retry capability ? reset signals ? power-up delay ? enable pins for main supplies (en) and sensor supplies (snsen) ? power sequencing for advanced microprocessor architectures ? soic-24wb package ordering information device temperature range (t a ) package mc33997dw/r2 -40c to 125c 24 soicw dw suffix 24-lead soicw case 751e power supply integrated circuit f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
33997 motorola analog integrated circuit device data 2 figure 1. 33997 simplified block diagram snsen v pw r ka_v pw r gnd 33997 en v sw v dd h drvl fbl pwrok v kam vkamok v bg v ref1 v ref2 i-lim ramp osc soft start lo gic & latch pwrok vkamok por 3.3v linear regulator driver 3.3v standby reg. bandgap voltage reference charge pump v ref1 reg. v ref2 reg. v bg v bg c res v sum fbkb en able control enb sn senb 5.0 v 5.0 v 3.3 v 5.0 v 3.3 v snsenb snsenb enb enb enb retry retry drive f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
motorola analog integrated circuit device data 33997 3 pin function description pin pin name description 1 vkamok keep-alive output monitoring. this pin is an "open-drain" output that will be us ed with a discrete pull-up resistor to v kam . when the supply voltage to the 33997 is di sconnected or lost, the vkamok signal goes low. 2 ka_v pwr keep alive power supply pin. this supply pin is used in modules that have both direct battery connections and ignition switch activated connections. 3 c res reservoir capacitor. this pin is tied to an external "reservoir capacitor" for the internal charge pump. 4 v pwr power supply pin. main power input to the ic. this pin is directly connected to the switching regulator power mosfet. in automotive applications this pin must be protected against reverse bat tery conditions by an external diode. 5?8 gnd ground of the integrated circuit. 9 v sw internal p-channel power mosfet drain. v sw is the "switching node" of the voltage buck converter. this pin is connected to the v pwr pin by an integrated p-channel mosfet. 10 pwrok power ok reset pin. this pin is an "open-drain" output that will be used with a di screte pull-up resistor to v kam , v ddh , or v ddl . when either v ddh or v ddl output voltage goes out of the r egulation limits this pin is pulled down. 11 fbkb step-down switching regulator f eedback pin. the fbkb pin is the v ddh feedback signal for the switching regulator. 12 v sum error amplifier "summing node". the v sum pin is connected to the inverting input of the error amplifier. this node is also the "common" point of th e integrated feedback resistor divider. 13 drvl drive for v ddl (3.3 v) regulator. the drvl pin drives the ba se of an external npn pass transistor for the v ddl linear post regulator. the collector of t he vddl pass transistor is connected to v ddh . an example of a suitable pass transistor is bcp68. 14 fbl feedback for v ddl (3.3 v) regulator. the fbl pin is the voltage feedback sense signal from the v ddl (3.3 v) linear post regulator. 15 v ddh v ddh is an input supply pin providing power for the buffered sensor supplies and the drive circuitry for the 3.3 v linear power regulator. the v ddh pin is supplied from the switching r egulator output, capable of providing 5.0 v @ 1400 ma total output current. 16 v ref2 sensor supply #2 output. the v ref2 pin is sensor supply output #2. 17?20 gnd ground of the integrated circuit. 21 v ref1 sensor supply #1 output. the v ref1 pin is sensor supply output #1. v kam gnd gnd gnd gnd v ref2 v ddh fbl drvl en snsen v ref1 vkamok gnd gnd gnd gnd v sw pwrok v sum ka_v pwr c res v pwr fbkb 5 6 7 8 9 10 11 12 2 3 4 24 20 19 18 17 16 15 13 23 22 21 14 1 f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
33997 motorola analog integrated circuit device data 4 22 snsen sensor supply enable input. the snsen pin is an input, which enables the v ref1 and v ref2 supplies. it allows the control module hardware/softw are to shut down the sensor supplies. 23 en enable input. the en pin is an input, which enables the main switching regulator and all other functions. when this pin is low, the power supply is in a low quiescent state. 24 v kam keep-alive (standby) 3.3 v regulator output. this is a 3.3 v low quiescent, low dropout regulator for keep alive memory. pin function desc ription (continued) pin pin name description f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
motorola analog integrated circuit device data 33997 5 maximum ratings all voltages are with respect to ground unless otherwise noted. rating symbol value unit main supply voltage v pwr -0.3 to 45 v keep-alive supply voltage ka_v pwr -0.3 to 45 v switching node v sw -0.5 to 45 v 5.0 v input power v ddh -0.3 to 6.0 v sensor supply v ref1 v ref2 -0.3 to 18 -0.3 to 18 v keep-alive supply voltage v kam -0.3 to 6.0 v maximum voltage at logic i/o pins en snsen pwrok vkamok -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 -0.3 to 6.0 v charge pump reservoir capacitor voltage c res -0.3 to 18 v error amplifier summing node v sum -0.3 to 6.0 v switching regulator output feedback fbkb -0.3 to 6.0 v v ddl base drive drvl -0.3 to 6.0 v v ddl feedback fbl -0.3 to 6.0 v esd voltage human body model (all pins) (note 1) machine model (all pins) (note 2) v esd1 v esd2 500 100 v power dissipation (t a = 25 c) (note 3) p d 800 mw thermal resistance, junction to ambient (note 4), (note 5) r j-a 60 c/w thermal resistance, junction to board (note 6) r j-b 20 c/w operational package temperature [a mbient temperature] (note 7) t a -40 to 125 c operational junction temperature t j -40 to 150 c storage temperature t stg -55 to 150 c lead soldering temperature (note 8) t s 260 c notes 1. esd1 testing is performed in accordance with the human body model (c zap =100 pf, r zap =1500 ? ). 2. esd2 testing is performed in ac cordance with the machine model (c zap =200 pf, r zap =0 ? ) 3. maximum power dissipation at indicated junction temperature. 4. junction temperature is a function of on-chip power dissipation, package thermal re sistance, mounting site (board) temperatur e, ambient temperature, air flow, power dissipation of other components on the board, and board thermal resistance. 5. per semi g38-87 and jedec jesd51-2 with the single layer board horizontal. 6. thermal resistance between the die and the printed circuit board per jedec jesd51-8. board temperature is measured on the top surface of the board near the package. 7. the limiting factor is junction temperat ure, taking into account the power dissipat ion, thermal resistance, and heat sinking. 8. lead soldering temperature limit is for 10 seconds maximum durat ion. not designed for immersi on soldering. exceeding these li mits may cause malfunction or permanent damage to the device. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
33997 motorola analog integrated circuit device data 6 static electrical characteristics characteristics noted under conditions 9.0 v v pwr 16 v, -40 c t j = t a 125 c, using the typical application circuit (see figure 8 ) unless otherwise noted. typical values noted reflect the approximate parameter mean at t a = 25 c under nominal conditions unless otherwise noted. characteristic symbol min typ max unit general supply voltage range normal operating voltage range (note 9) extended operating voltage range (note 9) v pwr(n) v pwr(e) 6.0 18 ? ? 18 26.5 v maximum transient voltage - load dump (note 10) v pwr(ld) ? ? 40 v v pwr supply current en = 5.0 v, v pwr = 14 v, no loads i vpwr 25 ? 150 ma v pwr quiescent supply current en = 0 v, v pwr = 12 v i q_vpwr 5.0 ? 15 a ka_v pwr supply current, en = 5.0 v, ka_v pwr = 14 v, no load on v kam i kavpwr 0.5 ? 3.0 ma ka_v pwr quiescent supply current en = 0 v, ka_v pwr = 12 v i q_kavpwr 50 ? 350 a buck regulator v ddh buck converter output voltage i vddh = 200 ma to 1.4 a, v pwr = ka_v pwr = 14 v v ddh 4.9 ? 5.1 v buck converter output voltage i vddh = 1.4 a, v pwr = ka_v pwr = 6.0 v v ddh 4.9 ? 5.1 v v ddh line regulation v pwr = ka_v pwr = 10 v to 14 v, i vddh = 200 ma regln vddh -20 ? 30 mv v ddh load regulation v pwr = ka_v pwr = 14 v, i vddh = 200 ma to 1.4 a v pwr = ka_v pwr = 6.0 v, i vddh = 200 ma to 1.4 a regld vddh -20 -20 ? ? 20 20 mv v ddh active discharge resistance v pwr = ka_v pwr = 14 v, en = 0 v, i vddh = 10 ma r hdisch 1.0 ? 15 ? p-channel mosfet drain-source breakdown voltage?not tested (note 11) bv dss 45 ? ? v drain-source current limit?not tested (note 11) isc sw1 ? -7.0 ? a notes 9. v ddh is fully functional when the 33997 is operat ing at higher battery voltages, but these parameters are not tested. the test cond ition as are: a) v ddh must be between 4.9 v and 5.1 v (200 ma to 1.4 a) for v pwr = 14 v to 18 v. b) v ddh must be between 4.8 v and 5.5 v (200 ma to 1.4 a) for v pwr = 18 v to 26.5 v. 10. part can survive, but no parameters are guaranteed. 11. guaranteed by design but not production tested. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
motorola analog integrated circuit device data 33997 7 static electri cal characteristics (continued) characteristics noted under conditions 9.0 v v pwr 16 v, -40 c t j = t a 125 c, using the typical application circuit (see figure 8 ) unless otherwise noted. typical values noted reflect the approximate parameter mean at t a = 25 c under nominal conditions unless otherwise noted. characteristic symbol min typ max unit linear regulator v ddl v ddl output voltage v pwr = ka_v pwr = 14 v, i vddl = 200 ma v ddl 3.15 ? 3.45 v v ddl line regulation v ddh = 4.8 v to 5.2 v, i vddl = 400 ma regln vddl -70 ? 70 mv v ddl load regulation v pwr = ka_v pwr = 14 v, i vddl = 10 ma to 400 ma regld vddl -70 ? 70 mv drvl output current v pwr = ka_v pwr = 14 v, vdrvl = 1.0 v i drvl 5.0 11 25 ma v ddl active discharge resistance v pwr = ka_v pwr = 14 v, en = 0 v, i fbl = 10 ma r ldisch 1.0 ? 10 ? v ddh to v ddl active clamp resistance v pwr = ka_v pwr = 14 v, en = 0 v, i vddh = 50 ma, v fbkb = 0 v r clamp 0.6 ? 10 ? v ddl output capacitor capacitance (note 12) c vddl ? 68 ? f v ddl output capacitor esr (note 12) esr vddl ? 0.125 ? ? keep-alive (standby) regulator v kam v kam output voltage i vkam = 5.0 ma, vpwr = ka_v pwr = 18 v, en = 5.0 v v kam 3.0 ? 3.6 v v kam output voltage, en = 0 v (standby mode) v pwr = ka_v pwr = 26 v, i vkam = 0.5 ma v pwr = ka_v pwr = 18 v, i vkam = 5.0 ma v pwr = ka_v pwr = 5.0 v, i vkam = 10.0 ma v pwr = 0 v, ka_v pwr = 3.5 v, i vkam = 5.0 ma v kam 3.0 3.0 3.0 2.0 ? ? ? ? 3.6 3.6 3.6 3.5 v v kam line regulation, en = 0 v (standby mode) v pwr = ka_v pwr = 5.0 v to 18 v, i vkam = 2.0 ma regln vkam -20 ? 20 mv v kam load regulation, en = 0 v (standby mode) v pwr = ka_v pwr = 14 v, i vkam = 1.0 ma to 10 ma regld vkam 0 ? 100 mv differential voltage v kam - v ddl en = 5.0 v, i vkam = 5.0 ma, v pwr = ka_v pwr = 14 v, i vddl = 200 ma reg vkam -20 ? 20 mv v kam output capacitor capacitance (note 12) c vkam ? 4.7 ? f v kam output capacitor esr (note 12) esr vkam ? 1.4 ? ? notes 12. recommended value. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
33997 motorola analog integrated circuit device data 8 characteristic symbol min typ max unit sensor supplies v ref1 , v ref2 v ref on-resistance, t a = -40c i vref = 200 ma, i vddh = 200 ma, v pwr = ka_v pwr = 14 v, en = 5.0 v r ds(on) ? ? 280 m ? v ref on-resistance, t a = +25c i vref = 200 ma, i vddh = 200 ma, v pwr = ka_v pwr = 14 v, en = 5.0 v r ds(on) ? ? 350 m ? v ref on-resistance, t a = +125c i vref = 200 ma, i vddh = 200 ma, v pwr = ka_v pwr = 14 v, en = 5.0 v r ds(on) ? ? 455 m ? v ref short-to-battery detect current v pwr = ka_v pwr = 14 v, en = 5.0 v, snsen = 5.0 v i sc_bat 500 ? 900 ma v ref short-to-ground detect current v pwr = ka_v pwr = 14 v, en = 5.0 v, snsen = 5.0 v i sc_gnd 500 ? 900 ma maximum output capacitance (total) (note 13) c vref 33 ? 39 nf supervisory circuits pwrok undervoltage threshold on v ddl , fbl ramps down v pwr = ka_v pwr = 14 v, i vddh = 200 ma v fbl(thl) 2.6 ? 3.1 v pwrok undervoltage threshold on v ddh v pwr = ka_v pwr = 14 v, i vddh = 200 ma v ddh(thl) 4.5 ? 4.8 v v ddh overvoltage threshold v pwr = ka_v pwr = 10 v, i vddh = 200 ma v ddh(thh) 5.12 ? 5.7 v pwrok open drain on-resistance v pwr = ka_v pwr = 14 v, en = 5 v, i pwrok = 5.0 ma r ds(on) ? ? 200 ? vkamok threshold, v pwr = ka_v pwr = 14 v, i vddh = 200 ma v kam(thl) 0.9 ? 1.9 v vkamok threshold on v pwr , v pwr ramps up ka_v pwr = 14 v, i vddh = 200 ma v pwrok(th) 4.0 ? 5.0 v vkamok open drain on-resistance v pwr = ka_v pwr = 14 v, en = 0 v, i vkamok = 10 ma r ds(on) 50 ? 200 ? enable input voltage threshold (pin en) v ih 1.0 ? 2.0 v enable pull-down current (pin en), en = 1.0 v v ddh to v il(min) i pd 500 ? 1200 na sensor enable input voltage threshold (pin snsen) v ih 1.0 ? 2.0 v sensor enable pull-down current (pin snsen) snsen = 1.0 v v ddh to v il(min) i pd 500 ? 1200 na notes 13. recommended value. static electrical charact eristics (continued) characteristics noted under conditions 9.0 v v pwr 16 v, -40 c t j = t a 125 c, using the typical application circuit (see figure 8 ) unless otherwise noted. typical values noted reflect the approximate parameter mean at t a = 25 c under nominal conditions unless otherwise noted. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
motorola analog integrated circuit device data 33997 9 characteristic symbol min typ max unit charge pump c res charge pump voltage v pwr = ka_v pwr = 14 v, i vddh = 200 ma, i cp = 0 a v pwr = ka_v pwr = 14 v, i vddh = 200 ma, i cp = 10 a v cres 12 12 ? ? 15 15 v static electrical charac teristics (continued) characteristics noted under conditions 9.0 v v pwr 16 v, -40 c t j = t a 125 c, using the typical application circuit (see figure 8 ) unless otherwise noted. typical values noted reflect the approximate parameter mean at t a = 25 c under nominal conditions unless otherwise noted. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
33997 motorola analog integrated circuit device data 10 dynamic electrical characteristics characteristics noted under conditions 9.0 v v pwr 16 v, -40 c t j = t a 125 c using the typical application circuit (see figure 8 ) unless otherwise noted. typical values noted reflect the approximate parameter mean at t a = 25 c under nominal conditions unless otherwise noted. characteristic symbol min typ max unit buck regulator v ddh switching frequency (note 14) f sw ? 750 ? khz soft start duration (see figure 2 ) v pwr = ka_v pwr = 6.0 v t ss 5.0 ? 15 ms charge pump c res charge pump current ramp-up time v pwr = ka_v pwr = 14 v, c res = 22 nf, v cp = 1.0 v to 11 v t cres 1.0 ? 20 ms charge pump ramp-up time v pwr = ka_v pwr = 7.0 v, c res = 22 nf, v cp = 7.0 v to 10 v t cres 1.0 ? 10 ms sensor supplies v ref1 , v ref2 v ref overcurrent detection time (see figure 3 ) v ref load r l = 5.0 ? to gnd, v ddh = 5.1 v, v pwr = ka_v pwr = 10 v, en = 5.0 v, snsen = 5.0 v t det 0.5 ? 2.0 s v ref retry timer delay (see figure 3 ) v ref load r l = 5.0 ? to gnd, v ddh = 5.1 v, v pwr = ka_v pwr = 10 v, en = 5.0 v, snsen = 5.0 v t ret 5.0 ? 20 ms supervisory circuits pwrok delay time (power-on reset) (see figure 4 ) t d(pwrok) 5.0 ? 15 ms vkamok delay time (see figure 5 ) t d(vkamok) 10 ? 30 ms v ddh power-up delay time (see figure 6 ) t d(vpwr) 1.0 ? 10 ms fault-off timer delay time (see figure 7 ) t fault 1.0 ? 10 ms notes 14. guaranteed by design but not production tested. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
motorola analog integrated circuit device data 33997 11 timing diagrams figure 2. soft-start time figure 3. v ref retry timer figure 4. pwrok delay timer (power-on reset) 4.8v t ss 0 5.0 0 0 6.0 k a _ v p w r v d d h ( v ) e n ( v ) 5.0 v p w r ( v ) time ( v ) 2.5v 0 5.0 0 0 14 k a _ v p w r v r e f ( v ) e n ( v ) 5.0 v p w r ( v ) 0 3.3 p w r o k ( v ) ??v time 2.0v t ret s n s e n t det 2.0v 4.0v 0 5.0 0 0 14 k a _ v p w r v d d h ( v ) e n ( v ) 5.0 v p w r ( v ) ( v ) t d(pwrok) 0 3.3 p w r o k ( v ) 4.6v time f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
33997 motorola analog integrated circuit device data 12 timing diagrams (continued) figure 5. vkamok delay time figure 6. v ddh power-up delay time figure 7. fault-off timer delay time t d(vkamok) 0 5.0 0 0 0 6.0 k a _ v p w r ( v ) v pwr =0v v k a m o k ( v ) v k a m ( v ) 3.3 e n ( v ) time 1.25v 3.3 2.0v t d(vpwr) 0 5.0 0 0 0 18 k a _ v p w r v d d h ( v ) v p w r ( v ) 18 e n ( v ) 5.0 ( v ) time 0 5.0 0 0 14 k a _ v p w r v d d h ( v ) e n ( v ) 5.0 v p w r ( v ) t fault 0 3.3 p w r o k ( v ) 4.8v 0 3.3 v d d l time 1.0v t fault 4.8v 1.0v ( v ) f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
motorola analog integrated circuit device data 33997 13 system/application information introduction the 33997 multi-output power su pply integrated circuit is capable of operating from 6.0 v up to 26.5 v with 40 v transient capability. it incorporates a step-down switching controller regulating directly to 5.0 v. the 3.3 v linear regulator uses an external pass transistor, thus re ducing the power dissipation of the integrated circuit. the 33997 also provides a 3.3 v linear standby regulator and two 5.0 v sensor supply outputs protected by internal low-resistance ldmos transistors against short-to-battery and short-to-ground. functional pin description switching regulator v ddh the switching regulator is a high-frequency (750 khz), conventional buck converter wit h integrated high-side p- channel power mosfet. its output voltage is regulated to provide 5.0 v with 2% accuracy and it is intended to directly power the digital and analog circui ts of the electronic control module (ecm). the switching regulator output is rated for 1400 ma total output current. this current can be used by the linear regulator v ddl and sensor supplies v ref1 and v ref2 . the 33997 switching controller utilizes "sensorless current mode control" to achieve good line rejection and stabilize the feedback loop. a soft-start feat ure is incorporated into the 33997. when the device is enabled, the switching regulator output voltage v ddh ramps up to about half of full scale and then takes 16 steps up to the nominal regulation voltage level (5.0 v nominal). 3.3 v linear regulator v ddl the 3.3 v linear post-regulator is powered from the 5.0 v switching regulator output (v ddh ). a discrete pass transistor is used to the power path for the v ddl regulator. this arrangement minimizes the power dissipation off the controller ic. the fbl pin is the feedback input of the regulator control loop and the drvl pin the external npn pass transistor base drive. power up, power down , and fault management are coordinated with the 5.0 v switching regulator. sensor supplies v ref1 and v ref2 the sensor supplies are im plemented using a protected switch to the main 5.0 v (s witching regulator) output. the 33997 integrated circuit provides two low-resistance ldmos power mosfets connected to the switching regulator output (v ddh ). these switches have short-to-battery and short-to- ground protection integrated into the ic. when a severe fault conditions is detected, the affe cted sensor outpu t is turned off and the sensor retry timer starts to time out. after the retry timer expires, the sensor supply tries to power up again. sensor supplies v ref can be disabled by pulling the sensor enable snsen pin low (see figure 7 for the v ref retry timer operation). notes: severe fault conditions on the v ref1 and v ref2 outputs, like hard shorts to either ground or battery, may disrupt the operation of the main regulator v ddh . shorts to battery above 17 v are considered ?doubl e faults? and neither one of the v ref outputs is protected against such conditions. depending on the v ddh capacitor value and its esr value, the severity of the short may disrupt the v ddh operation. keep-alive (standby) regulator v kam the keep-alive regulator v kam (keep-alive memory) is intended to provide power for ?key off? functions such as nonvolatile sram, ?keyoff" timers and controls, keyswitch monitor circuits, and perhaps a can/scp monitor and wake- up function. it may also power other low-current circuits required during a ?keyoff? conditi on. the regulated voltage is nominally 3.3 v. a severe fault condition on the v kam output is signaled by pulling the vkamok signal low. v kam keep-alive operation (standby, power-down mode) when the en pin is pulled low, the power supply is forced into a low-current standby mode. in order to reduce current drawn by the v pwr and ka_v pwr pins, all power supply functions are disabled except for the v kam and enable (en) pins. the latter pin is monitored for the "wake-up" signal. the switching transistor gate is actively disabled and the v ddl and v ddh pins are actively pulled low. power-up delay timers two power-up delay timers are integrated into the control section of the integrated circui t. one timer monitors the input voltage at the v pwr input pin (see figure 3 ), and the other monitors the input voltage at the ka_v pwr input pin . in both cases, sufficient supply volt age must be present long enough for the timers to ?time out? before the switching regulator can be enabled. fault-off timer if the v ddl output voltage does not reach its valid range at the end of soft-start period, or if the v ddh or v ddl output voltage gets below its pwrok threshold level, the fault-off timer shuts the switching regulat or off until the timer ?times out? and the switching regulator retries to power up again (see figure 7 for fault-off timer operation details). f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
33997 motorola analog integrated circuit device data 14 power-on reset timer this timer starts to time out at the end of the soft-start period if the v ddh and v ddl outputs are in the va lid regulation range. if the timer ?times out?, then the open-drain pwrok signal is released, indicating that ?power is on?. supervisory circuits pwrok and vkamok the 33997 has two voltage monitoring open-drain outputs, the pwrok and the vkamok pins. pwrok is "active high". this output is pulled low when either of the regulator outputs (v ddh or v ddl ) are below their regulation windows. if both regulator outputs are above their respective lower thresholds, and the power-on reset timer has ex pired, the output driver is turned off and this pin is at high-impedance state (see figure 6 ). the vkamok signal indicates a severe fault condition on the keep-alive regulator output v kam . the v kam output voltage is compared to the internal bandgap reference voltage. when the v kam falls below the bandgap reference voltage level, the vkamok signal is pulled low. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
motorola analog integrated circuit device data 33997 15 applications figure 8. 33997 application circuit schematic diagram table 1. recommended components designator value / rating description / part no. manufacturer (note 16) cf1 10 f/50 v aluminum electrolytic/uub1h100mnr nichicon cf2, c2 1.0 f/50 v ceramic x7r/c1812c105k5ractr kemet c1 100 f/50 v aluminum electr olytic/uuh1v101mnr nichicon c3 (note 15) 68 f/10 v tantalum/t494d686m010as kemet c6 68 f/10 v tantalum/t494d686m010as kemet c7 4.7 f/10 v tantalum/t494a475m010as kemet c4, c5 100 nf/16 v ceramic x7r any manufacturer c8 (optional) 390 pf/50 v ce ramic x7r any manufacturer c9 22 nf/25 v ceramic x7r any manufacturer notes 15. it is possible to use ceramic capacitors in the switcher output, e.g. c3 = 2 x 22 f/6.3 v x7r ceramic. in this case the comp ensation resistor has to be changed to rc1 = 200 ? to stabilize the switching regulator operation. 16. motorola does not assume liability, endorse, or warrant components from external manufacturers t hat are referenced in circui t drawings or tables. while motorola offers component recommendations in this c onfiguration, it is the customer?s responsibility to validate their application. note the v ddh total output current is 1.4 a. this includes the current used by the linear regulator v ddl and buffered outputs v ref1 and v ref2 . snsen v pw r ka _v pwr gnd 33997 en vs w v ddh drvl fb l pw rok v kam vkamok v bg v ref1 v ref2 i-lim ramp osc soft start logic & latc h pwrok vkamok por 3. 3v linear regulator driver 3.3v standby reg. bandgap voltage reference ch arge pump v ref 1 reg. v ref 2 reg. v bg v bg c res v sum fbkb enable control en b snsenb snse nb sn senb enb enb enb retry retry drive c9 22nf cs1 33nf lf1 10uh c2 1.0uf 100uf c1 cf 2 1.0uf 10 uf cf1 cs2 33nf c6 68uf 100nf c5 c4 100nf 68uf c3 l1 15uh c7 4.7uf r1 10k r2 10k q1 rc1 3.6k cc1 2. 2nf d1 dp1 dp2 9 11 12 15 13 14 24 1 10 5-8 17-20 22 2 3 3 16 21 2 4 v ddl =3.3v @400ma v kam =3.3 v @10m a v ddh =5.0v @ 1400ma total c8 390pf r3 2.2r optional snubber f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
33997 motorola analog integrated circuit device data 16 cs1, cs2 33 nf/25 v ceramic x7r any manufacturer cc1 2.2 nf/16 v ceramic x7r any manufacturer r1, r2 10 k ? resistor 0805, 5% any manufacturer r3 (optional) 2.2 ? resistor 0805, 5% any manufacturer rc1 3.6 k ? resistor 0805, 5% any manufacturer lf1 10 h cdrh127-100m or slf10145-100m2r5 sumida tdk l1 15 h cdrh127-150mc or slf10145-150m2r2 sumida tdk q1 1.0 a/20 v bipolar transistor/bcp68t1 on semiconductor d1 2.0 a/50 v schottky diode/ss25 general semiconductor dp1 3.0 a/200 v diode/murs320 on semiconductor dp2 27 v transient voltage suppressor/sm5a27 general semiconductor notes 17. motorola does not assume liability, endorse, or warrant components from external manufacturers t hat are referenced in circui t drawings or tables. while motorola offers component recommendations in this c onfiguration, it is the customer?s responsibility to validate their application. designator value / rating description / part no. manufacturer (note 16) (note 17) f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
motorola analog integrated circuit device data 33997 17 package dimensions notes: 1. dimensioning and to lerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimensions a and b do not include mold protrusion. 4. maximum mold protrusion 0.15 (0.006) per side. 5. dimension d does not include dambar protrusion. allowable dambar protrusion shall be 0.13 (0.005) total in excess of d dimension at maximum material condition. -a- -b- p 12x d 24x 12 13 24 1 m 0.010 (0.25) b m s a m 0.010 (0.25) b s t -t- g 22x seating plane k c r x 45 m f j dim min max min max inches millimeters a 15.25 15.54 0.601 0.612 b 7.40 7.60 0.292 0.299 c 2.35 2.65 0.093 0.104 d 0.35 0.49 0.014 0.019 f 0.41 0.90 0.016 0.035 g 1.27 bsc 0.050 bsc j 0.23 0.32 0.009 0.013 k 0.13 0.29 0.005 0.011 m 0 8 0 8 p 10.05 10.55 0.395 0.415 r 0.25 0.75 0.010 0.029 dw suffix 24-lead soic wide body plastic package case 751e-04 issue e f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
33997 motorola analog integrated circuit device data 18 notes f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
motorola analog integrated circuit device data 33997 19 notes f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
information in this document is provided solely to enable system and software implem enters to use motorola products. there are no express or implied copyright licenses granted hereunder to desig n or fabricate any integrated circuits or integrated circuits based on the informa tion in this document. motorola reserves the right to make changes without further noti ce to any products herein. motorola makes no warranty, represen tation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. ?typical? parameters which may be provided in motorola data sheets and/or s pecifications can and do vary in different applications and actual performance may var y over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. motorola does not convey any license under its patent rights nor the rights of others. motorola pro ducts are not designed, intended, or authorized for use as compon ents in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in whic h the failure of the motorola product could create a situation where personal injury or death may occur. should buyer purchase or use motorola products for any such unintended or unauthorized application, buyer shall indemnify and hold motorola and its officers, employees, subsidiaries, affiliates, and di stributors harmless against all claims, costs, damages, and expenses , and reasonable attorney fees arising out of, directly or indirectly, any claim of persona l injury or death associated with such unintended or unauthorized use, even if such claim a lleges that motorola was negligent regarding the design or manufa cture of the part. motorola and the stylized m logo are registered in the us patent and trademark office. all other product or service names are t he property of their respective owners. ? motorola, inc. 2003 how to reach us: usa/europe/locations not listed: japan: motorola japan ltd.; sps, technical information center motorola literature distribution 3-20-1 minami-azabu. minato-ku, tokyo 106-8573, japan p.o. box 5405, denver, colorado 80217 81-3-3440-3569 1-800-521-6274 or 480-768-2130 asia/pacific: motorola semiconductors h. k. ltd.; silicon harbour centre 2 dai king street, tai po industrial estate, tai po, n.t., hong kong 852-26668334 home page: http://motorola.com/semiconductors mc33997/d f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .

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