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no. ea-075-0012 pwm step-up dc/dc converter r1210n1 series application manual
pwm step-up dc/dc converter r1210n1 series 1 outline the r1210n 1 series are pwm step-up dc/dc converter, with high accuracy, low supply current by cmos process. each of the r1210n 1 series consists of an oscillator, a pwm circuit, a reference voltage unit, an error amplifier, phase compensation circuit, resistors for voltage detection, a chip enable circuit. further, includes a controller against drastic load transient, a control transistor with low on-resistance, ?l x switch?, and a protection circuit for l x switch and an output voltage detector. r1210n 1a series contain further a circuit for changeover oscillator frequency each. a low ripple, high efficiency step-up dc/dc converter can be composed of this ic with only three external compo- nents, or an inductor, a diode and a capacitor. the r1210n series can detect drastic change of output voltage with a circuit controller. the load transient re- sponse is improved compared with current model, furthermore the r1210n 1a series have another function, that is, when the load current is small, oscillator frequency is decreased by a circuit for switching oscillator frequency from typ. 100khz to 35khz, therefore, supply current is reduced. the built-in chip enable circuit can make the standby mode with ultra low quiescent current. since the package for these ics is small sot-23-5, high density mounting of the ics on board is possible. features ? external components ................................................................. only an inductor, a diode, and a capacitor ? standby current ......................................................................... typ. 0a ? low temperature-drift coefficient of output voltage.............. typ. 100ppm/c ? output voltage............................................................................. stepwise setting with a step of 0.1v in the range of 2.2v to 6.0v ( 1c/d) 2.2v to 3.5v ( 1a) ? two choices of basic oscillator frequency................................ 100khz ( 1a/c), 180khz ( 1d) ? small package .............................................................................. sot-23-5 (mini-mold) ? high efficiency ............................................................................ typ. 88% (v in =set output voltage 0.6 [v], i out =10ma) ? low ripple, low noise ? built-in a driver transistor with low on-resistance ? start-up voltage........................................................................... max. 0.9v ? basic frequency change-over circuit (only for 1a type)....... from typ. 100khz to 35khz
r1210n1 2 applications ? power source for battery-powered equipment. ? power source for portable communication appliances, cameras, vcrs ? power source for appliances of which require higher voltage than battery voltage. block diagram chip enable v lx limiter phase comp. pwm controller buffer osc fosc control vref circuit 5 2 4 v out gnd 1 ce l x selection guide in the r1210n series, the output voltage, the oscillator frequency, the optional function, and the taping type for the ics can be selected at the user?s request. the selection can be made by designating the part number as shown below ; r1210n 1 - abc code contents a setting output voltage (v out ) : stepwise setting with a step of 0.1v in the range of 2.2v to 6.0v (for 1c/d version) or 2.2v to 3.5v (for 1a version) is possible. b designation of oscillator frequency a : 100khz with a frequency change-over circuit c : 100khz without a frequency change-over circuit d : 180khz without a frequency change-over circuit c designation of taping type; ex. :tr, tl (refer to taping specification) ?tr? is prescribed as a standard.
r1210n1 3 pin configuration sot-23-5 5 4 l x gnd (mark side) 12 3 ce v out nc pin description pin no. symbol description 1ce chip enable pin 2v out pin for monitoring output voltage 3 nc no connection 4 gnd ground pin 5l x switching pin (nch open drain) absolute maximum ratings symbol item rating unit v out v out pin output voltage 9.0 v v lx l x pin output voltage 9.0 v v ce ce pin input voltage 9.0 v i lx l x pin output current 400 ma p d power dissipation 250 mw topt operating temperature range -40 +85 c ts t g s t o r a g e te m p e r a t u r e r a n g e - 5 5 +125 c
r1210n1 4 electrical characteristics ? r1210n 1 (topt=25c) symbol item conditions min. typ. max. unit v out output voltage v in =v set 0.6, i out =1ma 0.975 1.025 v v in maximum input voltage 8 v ? v out / ? topt step-up output voltage temperature coefficient -40c to p t 85c 100 ppm/c vstart start-up voltage v in =0v 2v v out :1.8k ? pull-down 0.9 v ? vstart/ ? topt start-up voltage temperature coefficient -40c to p t 85c -3.2 mv/c 0.7 v ( 1a/c) vhold hold-on voltage v in =2v 0v, i out =1ma 0.9 v ( 1d) 30 55 a ( 1a/c) 2.2v v set 2.5v v out =v set 0.96 50 80 a ( 1d) 35 60 a ( 1a/c) 2.6v v set 3.0v v out =v set 0.96 60 90 a ( 1d) 40 70 a ( 1a/c) 3.1v v set 3.5v v out =v set 0.96 70 100 a ( 1d) 45 80 a ( 1c) 3.6v v set 4.0v v out =v set 0.96 80 110 a ( 1d) 50 90 a ( 1c) i dd1 supply current1 4.1v v set 4.5v v out =v set 0.96 90 120 a ( 1d)
r1210n1 5 symbol item conditions min. typ. max. unit 70 100 a ( 1c) 4.6v v set 5.0v v out =v set 0.96 100 130 a ( 1d) 80 110 a ( 1c) 5.1v v set 5.5v v out =v set 0.96 110 150 a ( 1d) 90 120 a ( 1c) i dd1 supply current1 5.6v v set 6.0v v out =v set 0.96 130 170 a ( 1d) 10 17 a ( 1a/c) i dd2 supply current2 v out =v ce =v set +0.5v 15 24 a ( 1d) istandby standby current v out =6v, v ce =0v 0.5 a i lxleak l x leakage current v out =v lx =8v 0.5 a 80 100 120 khz ( 1a/c) fosc maximum oscillator frequency v out =v ce =v set 0.96 144 180 216 khz ( 1d) 0.5 khz/c ( 1a/c) ? fosc/ ? topt oscillator frequency temperature coefficient -40c to p t 85c 0.6 khz/c ( 1d) maxdty oscillator maximum duty cycle v out =v ce =v set 0.96, (v lx ?l? side) 70 85 97 % v lxlim v lx limit voltage v out =v ce =v set 0.96, (v lx ?l? side) 0.4 0.6 0.8 v v ceh ce ?h? input voltage v out =v set 0.96 0.9 v v cel ce ?l? input voltage v out =v set 0.96 0.3 v i ceh ce ?h? input current v out =v ce =6.5v -0.1 0 0.1 a i cel ce ?l? input current v in =6.5v, v ce =0v -0.1 0 0.1 a
r1210n1 6 symbol item conditions min. typ. max. unit 2.2v v set 2.4v v lx =0.4v 70 ma 2.5v v set 2.9v v lx =0.4v 85 ma 3.0v v set 3.4v v lx =0.4v 100 ma 3.5v v set 3.9v v lx =0.4v 120 ma 4.0v v set 4.4v v lx =0.4v 140 ma 4.5v v set 4.9v v lx =0.4v 150 ma 5.0v v set 5.4v v lx =0.4v 170 ma i lx l x switching current 5.5v v set 6.0v v lx =0.4v 190 ma fosc2 change-over frequency v in =v set 0.6, i out =0.5ma (only for 1a) 10 35 70 khz *note: v set means setting output voltage.
r1210n1 7 test circuits a sd v out ce l x gnd c l v in l v e v out ce l x gnd c l oscilloscope b v out ce l x gnd a f v out ce l x gnd c l oscilloscope c v out ce l x gnd a g v out ce l x gnd oscilloscope d v out ce l x gnd a h v out ce l x gnd a l: 100h cd54 (sumida electric co, ltd) sd: ma721 (matsushita electronics corporation, schottky type) cl: 22f 2 (tantalum type)
r1210n1 8 typical characteristics 1) output voltage vs. output current r1210n301c r1210n301d 3.1 3.2 3.0 2.9 2.8 output current i out (ma) 050 v in :0.9v v in :1.5v v in :2.0v v in :2.5v 150 250 200 300 100 output voltage v out (v) 3.1 3.2 3.0 2.9 2.8 output current i out (ma) 050 v in :0.9v v in :1.5v v in :2.0v v in :2.5v 150 250 200 300 100 output voltage v out (v) r1210n501c r1210n501d 5.2 5.4 5.0 4.8 4.6 4.4 output current i out (ma) 050 v in :1.5v v in :2.0v v in :3.0v v in :4.0v 150 250 200 300 100 output voltage v out (v) 5.2 5.4 5.0 4.8 4.6 4.4 output current i out (ma) 050 v in :1.5v v in :2.0v v in :3.0v v in :4.0v 150 250 200 300 100 output voltage v out (v) 2) efficiency vs. output current r1210n301c r1210n301d 80 100 60 40 20 0 output current i out (ma) 050 v in :0.9v v in :1.5v v in :2.0v v in :2.5v 150 250 200 300 100 efficiency (%) 80 100 60 40 20 0 output current i out (ma) 050 v in :0.9v v in :1.5v v in :2.0v v in :2.5v 150 250 200 300 100 efficiency (%)
r1210n1 9 r1210n501c r1210n501d 80 100 60 40 20 0 output current i out (ma) 050 v in :1.5v v in :2.0v v in :3.0v v in :4.0v 150 250 200 300 100 efficiency (%) 80 100 60 40 20 0 output current i out (ma) 050 v in :1.5v v in :2.0v v in :3.0v v in :4.0v 150 250 200 300 100 efficiency (%) 3) r1210n 1a/c efficiency r1210n301 output current i out (ma) 0.01 100 90 80 70 60 50 40 30 20 10 0 0.10 1.00 10.00 100.00 efficiency (%) r1210n301a r1210n301c v in :1.5v 4) ripple voltage vs. output current r1210n301c r1210n301d 120 140 100 80 60 40 20 0 output current i out (ma) 0 v in :1.5(v) v in :2.0(v) v in :0.9(v) 100 150 50 ripple voltage vripple (mv) esr:0.33 ? 120 140 100 80 60 40 20 0 output current i out (ma) 0 v in :1.5(v) v in :2.0(v) v in :0.9(v) 100 150 50 ripple voltage vripple (mv) esr:0.33 ?
r1210n1 10 r1210n501c r1210n501d 120 140 100 80 60 40 20 0 output current i out (ma) 050 v in :1.5(v) v in :2.0(v) v in :0.9(v) 150 250 200 300 100 ripple voltage vripple (mv) esr:0.33 ? 120 140 100 80 60 40 20 0 output current i out (ma) 050 v in :1.5(v) v in :2.0(v) v in :0.9(v) 150 250 200 300 100 ripple voltage vripple (mv) esr:0.33 ? 5) start-up voltage/hold-on voltage vs. output current (topt=25c) r1210n301c r1210n301d 1.6 2.0 1.2 0.8 0.4 0.0 output current i out (ma) 05 vhold vstart 15 25 20 30 10 start-up/hold-on voltage vstart/vhold (v) 1.6 2.0 1.2 0.8 0.4 0.0 output current i out (ma) 05 vhold vstart 15 25 20 30 10 start-up/hold-on voltage vstart/vhold (v) r1210n501c r1210n501d 1.6 2.0 1.2 0.8 0.4 0.0 output current i out (ma) 05 vhold vstart 15 25 20 30 10 start-up/hold-on voltage vstart/vhold (v) 1.6 2.0 1.2 0.8 0.4 0.0 output current i out (ma) 05 vhold vstart 15 25 20 30 10 start-up/hold-on voltage vstart/vhold (v)
r1210n1 11 6) output voltage vs. temperature r1210n301c r1210n301d 3.05 3.10 3.00 2.95 2.90 temperature topt ( c) -50 -25 i out :10(ma) i out :30(ma) i out :0(ma) 25 75 50 100 0 output voltage v out (v) 3.05 3.10 3.00 2.95 2.90 temperature topt ( c) -50 -25 i out :10(ma) i out :30(ma) i out :0(ma) 25 75 50 100 0 output voltage v out (v) r1210n501c r1210n501d 5.05 5.15 5.10 5.00 4.95 4.85 4.90 temperature topt ( c) -50 -25 i out :10(ma) i out :30(ma) i out :0(ma) 25 75 50 100 0 output voltage v out (v) 5.05 5.15 5.10 5.00 4.95 4.85 4.90 temperature topt ( c) -50 -25 i out :10(ma) i out :30(ma) i out :0(ma) 25 75 50 100 0 output voltage v out (v) 7) supply current 1 vs. temperature r1210n301a r1210n301d 80 100 60 40 20 0 temperature topt ( c) -50 -25 25 75 50 100 0 supply current i ss1 ( a) 80 100 60 40 20 0 temperature topt ( c) -50 -25 25 75 50 100 0 supply current i ss1 ( a)
r1210n1 12 r1210n501c r1210n501d 85 120 100 60 40 0 20 temperature topt ( c) -50 -25 25 75 50 100 0 supply current i ss1 ( a) 85 120 100 60 40 0 20 temperature topt ( c) -50 -25 25 75 50 100 0 supply current i ss1 ( a) 8) supply current2 vs. temperature r1210n301a r1210n221d 20 25 15 10 5 0 temperature topt ( c) -50 -25 25 75 50 100 0 supply current i ss2 ( a) 20 25 15 10 5 0 temperature topt ( c) -50 -25 25 75 50 100 0 supply current i ss2 ( a) r1210n501c r1210n601d 20 25 15 10 5 0 temperature topt ( c) -50 -25 25 75 50 100 0 supply current i ss2 ( a) 20 25 15 10 5 0 temperature topt ( c) -50 -25 25 75 50 100 0 supply current i ss2 ( a)
r1210n1 13 9) standby current vs. temperature r1210n221a r1210n221d 0.6 1.0 0.8 0.4 0.2 -0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 standby current istandby ( a) 0.6 1.0 0.8 0.4 0.2 -0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 standby current istandby ( a) r1210n601c r1210n601d 0.6 1.0 0.8 0.4 0.2 -0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 standby current istandby ( a) 0.6 1.0 0.8 0.4 0.2 -0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 standby current istandby ( a) 10) oscillator frequency vs. temperature r1210n221a r1210n221d 200 300 250 150 100 0 50 temperature topt ( c) -50 -25 25 75 50 100 0 oscillator frequency fosc (khz) 200 300 250 150 100 0 50 temperature topt ( c) -50 -25 25 75 50 100 0 oscillator frequency fosc (khz)
r1210n1 14 r1210n601c r1210n601d 200 300 250 150 100 0 50 temperature topt ( c) -50 -25 25 75 50 100 0 oscillator frequency fosc (khz) 200 300 250 150 100 0 50 temperature topt ( c) -50 -25 25 75 50 100 0 oscillator frequency fosc (khz) 11) maximum duty cycle vs. temperature r1210n221a r1210n221d 80 100 90 70 60 40 50 temperature topt ( c) -50 -25 25 75 50 100 0 maximum duty cycle (%) 80 100 90 70 60 40 50 temperature topt ( c) -50 -25 25 75 50 100 0 maximum duty cycle (%) r1210n601c r1210n601d 80 100 90 70 60 40 50 temperature topt ( c) -50 -25 25 75 50 100 0 maximum duty (%) 80 100 90 70 60 40 50 temperature topt ( c) -50 -25 25 75 50 100 0 maximum duty (%)
r1210n1 15 12) l x switching current vs. temperature r1210n301a r1210n501c 400 500 300 200 100 0 temperature topt ( c) -50 -25 25 75 50 100 0 l x switching current i_l x switch (ma) 400 500 300 200 100 0 temperature topt ( c) -50 -25 25 75 50 100 0 l x switching current i_l x switch (ma) r1210n221d r1210n601d 400 500 300 200 100 0 temperature topt ( c) -50 -25 25 75 50 100 0 l x switching current i_l x switch (ma) 400 500 300 200 100 0 temperature topt ( c) -50 -25 25 75 50 100 0 l x switching current i_l x switch (ma) 13) l x leakage current vs. temperature r1210n221a r1210n221d 0.6 1.0 0.8 0.4 0.2 -0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 l x leakage current i lx _leak ( a) 0.6 1.0 0.8 0.4 0.2 -0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 l x leakage current i lx _leak ( a)
r1210n1 16 r1210n601c r1210n601d 0.6 1.0 0.8 0.4 0.2 -0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 l x leakage current i lx _leak ( a) 0.6 1.0 0.8 0.4 0.2 -0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 l x leakage current i lx _leak ( a) 14) v lx voltage limit vs. temperature r1210n301a r1210n221d 0.8 1.0 0.6 0.4 0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 l x voltage limit v lxlim (v) 0.8 1.0 0.6 0.4 0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 l x voltage limit v lxlim (v) r1210n501c r1210n601d 0.8 1.0 0.6 0.4 0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 l x voltage limit v lxlim (v) 0.8 1.0 0.6 0.4 0.2 0.0 temperature topt ( c) -50 -25 25 75 50 100 0 l x voltage limit v lxlim (v)
r1210n1 17 15) ce h input voltage vs. temperature r1210n221a r1210n601c 0.7 0.9 0.8 0.6 0.5 0.3 0.4 temperature topt ( c) -50 -25 25 75 50 100 0 ce"h" input voltage v_ce"h" (v) 0.7 0.9 0.8 0.6 0.5 0.3 0.4 temperature topt ( c) -50 -25 25 75 50 100 0 ce"h" input voltage v_ce"h" (v) 16) ce l input voltage vs. temperature r1210n221a r1210n601c 0.7 0.9 0.8 0.6 0.5 0.3 0.4 temperature topt ( c) -50 -25 25 75 50 100 0 ce"l" input voltage v_ce"l" (v) 0.7 0.9 0.8 0.6 0.5 0.3 0.4 temperature topt ( c) -50 -25 25 75 50 100 0 ce"l" input voltage v_ce"l" (v)

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