33702 microprocessor power supply (3.0 a) the 33702 is a monolithic ic providing an efficient means of obtaining power for the motorola power quicc i and ii microprocessor families and other advanced microprocessors. the ic incorporates a high-performance synchronous switching regulator. the regulator is capable of delivering 3.0 a to power the microprocessor's core and linear circuitry to control an external low-drop fet for powering the micro- processor's i/o operations. both regulator output voltages are independently adjustable. a boost converter allows high-accuracy output voltages to be developed from source operating voltages as low as 2.8 v. seven 1.0% output voltage margining steps are provided to facilitate easy system development. simplified application diagram other circuits 33702 2.8 to 6.0 v v ddh (i/os) v ddl (core) mpc82xx poreset 3.0 a 1.0 a v in1 ldrv ldo lfb cs rt v bd reset sw pgnd inv v in2 v bst clksyn clksel freq en1 gnd boot sda scl v out lcmp en2 addr v ddi 0.8 to 5.0 v (adjustable) 0.8 to 5.0 v (adjustable) v ldo v out analog products mc33702 fact sheet applications ? power management of advanced microprocessor based systems telecom and network cards wireless modems adsl line cards cable modems li-ion cell equipment portable equipment power management switching 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 . . .
features i 2 c with address register selection for programming control programmable internal watchdog and power-on reset to ensure mcu performance integrity synchronous buck converter with cycle-by-cycle pwm current mode control for enhanced output voltage accuracy boost converter for enhanced low-voltage performance adjustable switching regulator output voltage via external resistor divider external rc programmed reset power-up delay timer additional devices available for comparison in analog selector guide sg1002/d customer benefits high-performance power source supporting advanced microprocessors high-efficiency step-down switching regulator reduced pc board space resulting in enhanced application reliability and lower costs self-contained watchdog with power-on reset predictable up/down power sequencing to ensure cpu integrity flexible application protection and programmable performance features voltage margining for easy system development performance typical values operating voltage 2.8 v to 6.0 v output voltages: sw (adjustable) 0.8 to 5.0 v @ 3.0 a ldo (adjustable) 0.8 to 5.0 v @ 1.0 a voltage margining 7 steps 1.0% buck converter line & load reg. 1.0% current limit 4.5 a pwm freq. (adjustable) 200 to 400 khz operating temp -40c t a 105c 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 . . .
33702 internal block diagram v in1 v bst v bd v in v ddi internal supply boost control bandgap voltage reference en1 en2 rt addr sda scl reset power sequencing voltage margining watchdog timer reset control por timer buck control logic buck hs and ls driver thermal limit i 2 c interface switcher oscillator 300 khz slope comp uvlo linear regulator control i lim + - + - + - v bst v ref v ref v ref v ref v bst v bst v bst v ddi v ddi v ddi v ddi v ddi v ddi ldrv cs ldo lfb lcmp boot sw v in2 pgnd inv v out pgnd freq clksyn clksel (4) (2) (2) (2) 8.0 v 0.8 v reset power enable syscon i 2 c control syscon softst power down current limit pwm comp error amp v ldo v out to reset control v out power seq power seq i 2 c control q1 q2 shut auto protection detect limiting down recovery input under voltage output over voltage output under voltage over current/sc over temperature 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 . . .
questions do you need an accurate power management ic to power an advanced micro- processor? do you have little pc board space available for power management? are you looking for an easy-to-design power management ic with protection and operating features that can be performance programmed? ordering ship motorola information package method part number 32 soicw rail **33702dwb t/r **33702dwbr2 data sheet order number mc33702/d contact sales for evaluation kit availability **prefix index: pc = eng samples; xc = in qual; mc = production mc33702fs/d rev. 1 motorola and the stylized m logo are registered in the u.s. patent and trademark office. all other product or service names are the property of their respective owners. motorola, inc. is an equal opportunity affirmative action employer ? motorola, inc. 2003 how to reach us: usa/europe/locations not listed: motorola literature distribution; p.o. box 5405, denver, colorado 80217 1-800-521-6274 or 480-768-2130 japan: motorola japan ltd.; sps, technical information center, 3?20?1, minami?azabu. minato?ku, tokyo 106?8573 japan 81?3?3440?3569 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 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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