rev. page date rev. page date description: dc switching regulator, non-isolated 1 of 4 04/2008 20050 sw 112 th ave. tualatin, oregon 97062 p h o n e phone 503.612.2300 f a x fax 503.612.2382 part number: v78xx-1000 series features efficiency up to 95% no need for heatsinks wide input range short circuit protection thermal shutdown low ripple and noise pin compatible to lm78xx series non-isolated model input voltage output output efficiency number range voltage current vin_min vin_max v7803-1000 4.75~28 vdc 3.3 vdc 1000 ma 90% 83% v7805-1000 6.5~32 vdc 5 vdc 1000 ma 93% 88% v7806-1000 8~32 vdc 6.5 vdc 1000 ma 94% 90% v7809-1000 11~32 vdc 9 vdc 1000 ma 95% 92% v7812-1000 15~32 vdc 12 vdc 1000 ma 95% 94% output specifications item conditions min. typ. max. unit output voltage accuracy at 100% load 2 3 % line regulation vin = min. to max. at full load 0.2 0.4 % load regulation 10% to 100% full load 0.4 0.6 % output ripple 20 mhz bandwidth, output w/ 10 f cap 20 35 mvp-p short circuit protection continuous, auto recovery upon removal of short short circuit input power load impedance is 0.1 0.5 1.2 w output current limit subject to over-temp shutdown 2000 ma switching frequency fixed switching frequency topology 280 330 450 khz dynamic load stability 100%<->10% load 100 mv quiescent current vin_min to vin_max at no load 5 7 ma thermal shutdown internal ic junction 150 c temperature coefficient -40c ~ 85c ambient 0.02 %/c max load capacitance 2000 f general specifications item conditions min. typ. max. unit operating temperature range see derating curve -40 85 c operating case temperature -40 100 c storage temperature range -55 125 c cooling free air convection solderability 1.5 mm from case for 10 seconds 300 c storage humidity range relative humidity, non-condensing 10 95 % case material plastic (ul94-v0) case thermal impedance 50 c/w mtbf at 25c per mil-hdbk-217f 2,000,000 hours package weight 3.7 grams description the v78xx series of switching regulators are designed to replace 78xx linear regulators, with the objective of drop-in replacement without the need for a heatsink, because the v78xx series features high efficiency under all line conditions. built-in short-circuit and over-temperature protections ensure very rugged operations. additionally, low ripple and noise performance make the parts useful in a wide range of applications.
rev. page date description: dc switching regulator, non-isolated 2 of 4 04/2008 20050 sw 112 th ave. tualatin, oregon 97062 p h o n e phone 503.612.2300 f a x fax 503.612.2382 part number: v78xx-1000 series mechanical drawings 3+vout 2 1 gnd +vin 0.100 (2 plcs) 2.54 3.21 0.126 (3 plcs) 2.15 0.085 5.08 0.200 2 13 0.020 4.10 (3 plcs) 0.453 11.50 17.50 0.689 (typ) 0.50 0.50 0.020 (3 plcs) 8.90 0.350 0.30 0.012 (3 plcs) pin assignments recommended pcb layout pattern units: mm(inches) pin tolerances: 0.10(0.004) general tolerances: 0.25(0.01) 123 2.54 [0.100] top view 1.00 +0.15/-0 [0.040 +0.006/-0] 2.54 [0.100] 1 23 thermal derating curve operating temp.( ) c temperature derating graph
rev. page date description: dc switching regulator, non-isolated 3 of 4 04/2008 20050 sw 112 th ave. tualatin, oregon 97062 p h o n e phone 503.612.2300 f a x fax 503.612.2382 part number: v78xx-1000 series typical application circuit v78xx-1000 1 2 3 c2 100 f/25v 22 f/50v c1 gnd vin vout input capacitor (c1): a low esr capacitor is recommended to keep the noise at the converter to a minimum. ceramic capacitors are preferred but tantalum or low esr electrolytic capacitors may also suffice. place c1 as close as possible to pins 1 & 2. output capacitor (c2): a 100 f/25v electrolytic capacitor is recommended. not for parallel operation this converter is not designed for parallel operation with another to increase output power. test circuit + +vin gnd +vout 0v dc power source - current meter voltage meter cin dc/dc converter cout twisted 30cm, 18awg a b c01 c02 aaa bb b + - + current meter voltage meter electronic load 20mhz oscilloscope 1. cin = 10 f / 50v for 500ma and 22 f / 50v for 1a, cout = 100 f / 16v. 2. c01 = 10 f / 50v electrolytic, c02 = 0.1 f / 50v ceramic. 3. all points labeled a refer to one junction. 4. all points labeled b refer to one junction. 5. use a short ground loop for probing. do not use a wired ground clip. for efficiency & ripple graphs (page4)
rev. page date description: dc switching regulator, non-isolated 4 of 4 04/2008 20050 sw 112 th ave. tualatin, oregon 97062 p h o n e phone 503.612.2300 f a x fax 503.612.2382 part number: v78xx-1000 series efficiency and ripple efficiency vs vin(full load) 60 70 80 90 100 4.758 121620242832vin(v) 4.75 8 12 16 20 24 28 32 vin (v) 75 80 85 90 95 100 40 80 200 400 600 800 1000 1200 0 5 10 15 20 25 30 35 40 45 50 40 80 200 400 600 800 1000 1200 40 50 60 70 80 90 100 40 80 200 400 600 800 1000 1200 0 5 10 15 20 25 30 35 40 45 50 40 80 200 400 600 800 1000 1200 v7803-1000 v7805-1000 v7812-1000 v7803-1000 v7805-1000 v7812-1000 v7803-1000 v7805-1000 v7812-1000 v7803-1000 v7805-1000 v7812-1000 v7803-1000 v7805-1000 v7812-1000 v7803-1000 v7805-1000 v7812-1000 efficiency (%) ripple (mvpp) 0 10 20 30 40 50 ripple vs. vin ( full load) efficiency output ripple ripple (mvpp) efficiency (%) efficiency (%) efficiency vs. load (vin=vin_min) output current(ma) ripple vs. load (vin=vin_min) output current (ma) efficiency vs. load (vin=vin_max) output current (ma) ripple vs. load (vin=24v) output current (ma)
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