sat8565r/p/f/a electronics electronics point-of-load switching regulator 4.5vdc - 6vdc input, 1.21v dc - 5.0vdc output, 3.5a (preliminary) features ? input range 4.5v to 6v ? adjustable or fixed output voltage ? up to 3.7a output current ? integrated input capacitors ? variable frequency operation (note 1) ? remote-sense operation ? internal soft start ? efficiencies up to 85% ? thermal resistance ( jc) 4 o c/w description the sat8565 is a non-isolated powerpac module designed for high reliability and fu ll military point of load applications. fully integrated, the sat8565 includes buck controller, inductor, and input/output capacitors integrated in a single package. the sat8565 operates from an input voltage of +4.5v to +6v providing step down power conversion to any output voltage from 1.21v to 5.0v. operating features include output voltage adjust, output current limit, shutdown, external synchronization and soft start. careful de sign and layout ensure excellent stability, transient response, and low noise ope ration. packaged in a compact 5 pin mo-078 package, the sat8565 is manufactured in a f acility certified to mil-prf-38534 cl ass-h and operates over the full ?55 o c to +125 o c temperature range. this produ ct is offered in a variety of screening levels. see p/n guide (last page) for all variations. absolute maximum ratings (exceeding maximum ratings may damage the device) table.1 symbol parameter value unit vin dc input voltage vin-vground 12.0 v io output current 3.7 a pd power dissipation tcase=25deg.c 25 w rthjc thermal resistance, junction to case 2.5 o c/w vshdn shutdown pin voltage 7.0 v vsync sync pin voltage 7.0 v tstg storage temperature -65 to +150 o c tj operating temperature range -55 to +125 o c tsold maximum soldering temperature, 10sec 300 o c satcon electronics 1 sat8565 preliminary web rev 1 www.satcon.com
electrical characteristics @ ta=-55deg.c to +125deg.c (unless otherwise specified) symbol parameter test conditions value units min typ max vout output voltage accuracy vin=5.0v , iout=2.0a, vo= vref 1.0 2.0 % kvi line regulation +4.5v vin +6.0v, iout = 3a .1 % kvo load regulation vin = 5v, 1a iout 3a 1.0 % vin input voltage ran ge iout=2.5a 4.5 6 v vsync sync input voltage 1.5 2.2 v isc short-circuit current limit vin=5.0v, 6.0 a ishdn shutdown source current vin=6.0v; vshdn=0, vsw=0 75 ua fsync synchronizing range 1 580 1000 khz vshdn shutdown input voltage 2,3 vin=5.0, vout < 0.5v 0.4 v typical performance characteristics output ripple vs. current vout= +2.5v 0 20 40 60 80 0123 4 output current (a) vr (mv) efficiency , vout= +2.5v 76.00% 78.00% 80.00% 82.00% 84.00% 00.511.522.53 am ps notes: 1. frequency of operation can be adjusted when using the sync input, (table 1) . this input should be grounded when not in use. 2. output inhibit guaranteed @ vshdn< 0.4v. 3. shut-down pin may be pulled up to vin (rpullup 5k ? ), when not in use. satcon electronics 2 sat8565 preliminary web rev 1
application circuits figure 1.- basic fixed regulator version 1 figure 2.- adjustable regulator version 1 vout = vref x (1+radj/2490), with vref~1.21 volts table 4.- commonly availabl e 1% resistor values fo r various output voltages v out (v) r adj ( ?) v out (v) r adj ( ?) 1.21 0 2.8 3240 1.5 590 3.0 3650 1.8 1210 3.3 4320 2.0 1620 3.5 4750 2.2 2050 3.8 5360 2.5 2670 4.0 5760 satcon electronics 3 sat8565 preliminary web rev 1
figure 3.- remote sense version 1 * ~1.5nf times the number of paralleled units if us ing electrolytic output capaci tors, 22nf times if using ceramic output capacitors. figure 4.- parallel operation satcon electronics 4 sat8565 preliminary web rev 1
package outline table 4a- pin assignments (for sat8565r/f/a units) pin no pin name pin description 1 vin input voltage 2 gnd ground 3 vout output voltage 4 shdn shutdown pin. output reset occurs when vshdn< 0.4v 5 adjust/ remote/synch adjust pin for adjustable output (sat8565a) ; remote sense for sat8565r; synch input for sat8565f table 4b- pin assignments fo r parallel configuration, (sat8565p). pin no pin name pin description 1 vin input voltage 2 fb feedback pin 3 vout output voltage 4 synch sync pin. 5 vc compensation pin ordering information: sat8565a -3 h t -adj product number current designation screening level package type output voltage r= remote sense version - 3 = 3a version t = mo-078 - 1.3 = 1.3v fixed p= parallel version h = class-h compliant (mil- prf-38534) - 1.8 = 1.8v fixed f= fixed version blank = satcon commercial screening - 2.5 = 2.5v fixed a= adjustable version em = eng. model - 3.3 = 3.3v fixed - 5.0 = 5.0v fixed -adj = adjustable version satcon electronics 5 sat8565 preliminary web rev 1
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