ver.2010/09/03 1 NJW4140 switching regulator ic for boost converter ? features z operating voltage range 3v to 35v z drive nch mosfet (ciss=3,000pf, gate voltage 5v max.) z oscillation frequency 50khz to 1mhz z pwm control z external synchronous function z over current protection z built-in osc enable function z package outline dmp8, vsp8 ? block diagram ? package outline NJW4140m (dmp8) NJW4140r (vsp8) 2.9 4.0 1.2mm 1v in- v + pwm comparator error amp gnd enable control out vre f fb ct v ipk osc enable on/off si 5v reg. driver en osc u . d . please note that this device is still under the development and therefore the specifications are subject to change. bcd process series
ver.2010/09/03 2 en="h": on en="l": off v off_osc v en v on synchronized operation mode 6 5 1 2 3 8 7 4 in- fb ct si v+ en out gnd sbd 1 r sense1 v in c in c out power mos1 c fb r fb r 2 r 1 c t c nf r nf l 1 6 5 1 2 3 8 7 4 in- fb ct si v+ en out gnd sbd 2 r sense2 power mos2 l 2 on/off v out r en sw ch.1 ch.2 en="h": on en="l": off v off_osc v en v on synchronized operation mode 6 5 1 2 3 8 7 4 in- fb ct si v+ en out gnd 6 5 1 2 3 8 7 4 in- fb ct si v+ en out gnd sbd 1 r sense1 v in c in c out power mos1 c fb r fb r 2 r 1 c t c nf r nf l 1 6 5 1 2 3 8 7 4 in- fb ct si v+ en out gnd 6 5 1 2 3 8 7 4 in- fb ct si v+ en out gnd sbd 2 r sense2 power mos2 l 2 on/off v out r en sw ch.1 ch.2 en v in v out v + fb in- gnd l out c out c in sbd NJW4140 c nf r nf r2 r1 c fb r fb 5 6 7 8 ct 1 2 3 4 si c t r sense power mos fet NJW4140 typical application NJW4140 can realize non- isolated/isolated circuit l miniaturization is possible by the acceleration of o scillation frequency mlcc is corresponding please note that this device is still under the development and therefore the specifications are subject to change. multiple uses are possible by synchronous operation.
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