SM625/sm626/sm627 4/90 rev 1.1 2/94 l in f in ity microelectronics inc. copyright ? 1994 11861 western avenue garden grove, ca 92841 1 (714) 898-8121 fax: (714) 893-2570 features equivalent to the unitrode pic 625, 626, 627 15a current capability designed and characterized for switching regulator applications such as buck, boost, and buck-boost type cost saving design reduces size, improves efficiency, reduces noise and rfi high operating frequency (to > 100khz) results in smaller inductor-capacitor filter and improved power supply response time high operating efficiency at 7a typical performance - rise and fall time < 300ns efficiency > 85% electrically isolated, 4-pin, to-66 hermetic case high reliability features available with high reliability processing description the SM625/626/627 series of power output stages are espe- cially designed to be driven with standard pwm integrated circuits to form an efficient switching power supply. the SM625, sm626 and sm627 are optimized for non-isolated buck and buck-boost application. the hybrid circuit construction utilizes thick film resistors on a beryllia substrate for maximum thermal conductivity and resultant low thermal impedance. all of the active elements in the hybrid are fully passivated. functional diagram SM625/sm626/sm627 switching regulator power output stages
SM625/sm626/sm627 4/90 rev 1.1 2/94 l in f in ity microelectronics inc. copyright ? 1994 11861 western avenue garden grove, ca 92841 2 (714) 898-8121 fax: (714) 893-2570 absolute maximum ratings (note 1) 150 c -65 c to 150 c 300 c operating junction temperature hermetic (r package) .................................................. storage temperature range ............................. lead temperature (soldering, 10 seconds) .................... 4.0 c/w 4.0 c/w 60.0 c/w thermal resistance power switch, q j - c ................................................... commutating diode .................................................. case to ambient, q c - a ............................................ note 1. exceeding these ratings could cause damage to the device. r package: thermal resistance- junction to case , q jc .................. 4.0c/w thermal resistance- junction to ambient , q ja .............. 40c/w thermal data note a. junction temperature calculation: t j = t a + (p d x q ja ). note b. the above numbers for q jc are maximums for the limiting thermal resistance of the package in a standard mount- ing configuration. the q ja numbers are meant to be guidelines for the thermal performance of the device/pc- board system. all of the above assume no ambient airflow. SM625 sm626 sm627 input voltage, v 4 - 2 ......................................... 60v 80v 100v output voltage, v 1 - 2 ...................................... 60v 80v 100v drive input reverse voltage, v 3 - 4 ................. 5v 5v 5v output current, i 1 .......................................... 15a 15a 15a drive current, i 3 ............................................. -0.4a -0.4a -0.4a recommended operating conditions (note 2) operating ambient temperature range sm6xxr ....................................................... 0 c to 70 c sm6xxhrr ........................................... -55 c to 125 c note 2. range over which the device is functional. electrical characteristics (unless otherwise specified, these specifications apply for the operating ambient temperature of t a = 25 c. low duty cycle pulse testing tech- niques are used which maintains junction and case temperatures equal to the ambient temperature.) i 4 = 7a(-7a), i 3 = -30ma (30ma) i 4 = 15a(-15a), i 3 = -30ma (30ma) i 4 = 7a(-7a) i 4 = 15a(-15a) v 4 = rated input voltage v 4 = rated input voltage, t a = 125 c v 1 = rated output voltage v 1 = rated output voltage, t a = 125 c on-state voltage (note 3) diode forward voltage (note 3) off-state current diode reverse current v v v v m a m a m a m a test conditions parameter units note 3. pulse test: duration = 300 m s, duty cycle 2%. SM625 sm626 sm627 input voltage, v 4 - 2 ......................................... 50v 70v 90v output voltage, v 1 - 2 ...................................... 50v 70v 90v drive input reverse voltage, v 3 - 4 ................. 4v 4v 4v output current, i 1 .......................................... 13a 13a 13a drive current, i 3 ............................................. -0.3a -0.3a -0.3a 1.5 3.5 1.25 1.75 10 10 sg625/626/627 min. typ. max. 1.0 2.5 0.85 0.95 0.1 10 1.0 500
SM625/sm626/sm627 4/90 rev 1.1 2/94 l in f in ity microelectronics inc. copyright ? 1994 11861 western avenue garden grove, ca 92841 3 (714) 898-8121 fax: (714) 893-2570 current delay time current rise time voltage rise time voltage storage time voltage fall time current fall time efficiency (note 5) test conditions parameter units electrical specifications (continued) note 4. in switching an inductive load, the current will lead the voltage on turn-on and lag the voltage on turn-off (see figure 2). therefore, voltage delay time (t dv ) @ t di + t ri and current storage time (t si ) @ t sv + t fv . note 5. the efficiency is a measure of internal power losses and is equal to output power divided by input power. the switching speed circuit of figure 1, in which the efficiency measured, is represenative of typical operating conditions for the sm600 series switching regulators . dynamic characteristics (see figures 1 & 2) (notes 4 & 5) ac test circuit and switching time waveforms (note 6) figure 1 - SM625/626/627 switching speed circuit figure 2 - SM625/626/627 switching waveforms SM625 sm626 sm627 ns ns ns ns ns ns % 60 150 60 175 300 35 65 40 700 70 175 85 sg625/626/627 min. typ. max. figure 4 - negative output down/up (buck-boost) converter figure 3 - step down (buck) converter application circuits sm62x sm62x
SM625/sm626/sm627 4/90 rev 1.1 2/94 l in f in ity microelectronics inc. copyright ? 1994 11861 western avenue garden grove, ca 92841 4 (714) 898-8121 fax: (714) 893-2570 note 1. all packages are viewed from the top. 2. case is electrically isolated. 3. contact factory for additional screening available. 4-pin to-66 metal can r - package ambient temperature range SM625r 0 c to 70 c SM625hrr -55 c to 125 c sm626r 0 c to 70 c sm626hrr -55 c to 125 c sm627r 0 c to 70 c sm627hrr -55 c to 125 c part no. package connection diagram positive output positive input drive common 1 23 4 connection diagrams & ordering information (see note below)
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