njm2360 a - 1 - ver.2007-06-08 high precision dc/dc converter control ic general description package outline the njm2360a is a control circuit containing the primary functions required for dc to dc convertor. this device consist of high prec ision reference, comparator controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. this ic was specifically designed to be incorporated in step-up, step-down and inverting applicati ons with a minimum number of external components. this ic is designed to be 5% output voltage by using precision 1% resistance on external detected resistance. features ? precision reference 1.25v 2% ? output switch current 1.5a (max) ? operating voltage 2.5v* to 40v ? internal over cu rrent limit circuit ? supply voltage v + 2.5v* to 40v ? output voltage v or 1.25v to 40v ? oscillator frequency f osc 100hz to 100khz ? package outline dip8, dmp8 *ta =25c. at low temperature, the minimum voltage is 3.0v. pin configuration block diagram NJM2360AD njm2360am NJM2360AD njm2360am
njm2360a - 2 - ver.2007-06-08 absolute maximum ratings (t a = 25oc) parameter symbol ratings unit supply voltage v + 40 v comparator input voltage range v ir -0.3 to 40 v power dissipation p d (dip8) 875 (dmp8) 750 (note1) mw mw switch current i sw 1.5 a operating temperature range t opr -40 to + 85 oc storage temperature range t stg -40 to +150 oc (note 1) at on pc board electrical characteristics dc characteristics (v + = 5v, t a = 25oc) parameter symbol test condition min. typ. max. unit operating current i cc 5v v + 40v, ct = 0.001f s 1 = v + , inv in > v th , e s = gnd - 2.4 3.5 ma oscillator charge current i chg 5v v + 40v 20 35 50 a discharge current i dischg 5v v + 40v 150 200 250 a voltage swing v osc - 0.5 - v p-p discharge to charge current ratio i dischg /i chg s i = v + - 6 - - peak current sense voltage v ipk(sense) i chg = i dischg 250 300 350 mv output switch (note 2) saturation voltage 1 v ce(sat) 1 darlington connection (c s = c d ) i sw = 1.0a - 1.0 1.3 v saturation voltage 2 v ce(sat) 2 i sw = 1.0a, i c (driver) = 50ma (forced =20) - 0.5 0.7 v dc current gain h fe i sw = 1.0a, v ce = 5.0v 35 120 - - collector off-state current i c(off) v ce = 40v - 10 - na comparator threshold voltage v th 1.225 1.250 1.275 v input bias current i ib v in = ov - 40 400 na note 2 : output switch tests are performed under pu lsed conditions to mini mize power dissipation. [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.
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