e -52 n selection guide part type package features operation mode switching related additional function xc6372a sot-89-3 ? switching transistor incorporated standard type. ? pfm operation during light loads. built-in transistor "lx"lead xc6372b sot-89-3 ? external switching transistor standard type. ? adding external transistor can improve the output capability up to several hundred ma. external transitor "ext"lead xc6372c sot-89-5 ? stand-by (ce) function added version to the xc6372a ? stand-by current: 0.5 a max. built-in transitor "lx"lead xc6372d sot-89-5 ------------ ------------ chip enable(ce) chip enable(ce) ? stand-by (ce) function added version to the xc6372b ? stand-by current: 0.5 a max. external transitor "ext"lead xc6372e sot-89-5 ? individual power supply and set-up voltage sensing leads are available built-in transitor "lx"lead separated "v dd "and"v out "leads xc6372f pwm/pfm pwm/pfm pwm/pfm pwm/pfm pwm/pfm pwm/pfm sot-89-5 ? individual power supply and set-up voltage sensing leads are available. external transitor "ext"lead separated "v dd "and"v out "leads xc6372 series dual mode [pwm/pfm] step-up dc/dc converters u cmos low power consumption u operating voltage: 0.9v~10.0v u output voltage range: 2.0v~7.0v u output voltage accuracy: 2.5% u selectable oscillator frequency: (50khz, 100khz, 180khz) n applications l cellular phones, pagers l palmtops l cameras, video recorders l portable equipment n features operating (start-up) voltage range: 0.9v~10v output voltage range: 2.0v~7.0v in 0.1v increments highly accurate: set-up voltage 2.5% oscillator frequency: 50khz, 100khz, 180khz ( 15%) selectable maximum output currents (tr built-in): typ.100ma at v in =3.0,v out =5.0v....note(1) highly efficient (tr built-in): typ.85% at v in =3.0v, v out =5.0v.....note(1) both switching transistor built-in and external tr types are available. five-lead packaged units offer either chip enable or independent v out pin option. phase compensation and slow startup circuits included. small package: sot-89 mini-power mold (3-pin, 5-pin) note(1): performance depends on external components and pcb layout. n general description the xc6372 series, unlike the conventional pwm controlled converters, are a group of step-up dc/dc converters that automatically change their operation modes into pfm modes while loads are light, such as when the duty ratios are less than 10%. when loads are light, as in the stand-by mode, the xc6372 changes to pfm control so as to decrease oscillator frequencies, resulting in reduced supply current. therefore, the xc6372 is suitable for use with portable equipment that requires the pwm controlled performance of low ripple and high output current, and a supply current that varies between low and high. built-in proprietary phase compensation and slow start-up circuits ensure excellent transient response and improved performance. output voltage can be selected from 2.0v to 7.0v in 0.1v increments (accuracy: 2.5%). oscillator frequency is also selectable from three frequencies; 50, 100, and 180khz (accuracy: 15%). every built-in switching transistor type enables a step-up circuit to be configured using only three external components; a coil, a diode, and a capacitor. external transistor versions are available to accommodate high output current applications. sot-89 small package. hp010199 215
e -53 xc6372 series dual mode [pwm/pfm] step-up dc/dc converters 54 123 123 sot-89 (top view) sot-89-5 (top view) n pin configuration n pin assignment (xc6372a, c6372b) (xc6372c, c6372d) (xc6372e, c6372f) pin number xc6372a xc6372b pin name function 11v ss ground 22v out output voltage monitor / ic internal power supply 3 lx switch 3 ext external switch transistor drive pin number xc6372c xc6372d pin name function 55v ss ground 22v out output voltage monitor / ic internal power supply 4 lx switch 4 ext external switch transistor drive 3 3 ce chip enable 1 1 nc no connection pin number xc6372e xc6372f pin name function 55v ss ground 22v dd ic internal power supply 4 lx switch 4 ext external switch transistor drive 33v out output voltage monitor 1 1 nc no connection 216
e -54 n absolute maximum ratings n block diagram xc6372a~xc6372d xc6372e and xc6372f 1. built-in transistor type units use the lx pin. external transistor type units use the ext pin. 2. the ce pin is only used with the xc6372c and xc6372d. note: 1. the v dd pin is only used with the xc6372e and xc6372f . 2. built-in transistor type units use the lx pin. external transistor type units use the ext pin. note: (v out pin serves also as v dd .) ta=25 : parameter v out input voltage lx pin voltage lx pin current ext pin voltage ext pin current ce input voltage v dd input voltage continuous total power dissipation operating ambient temperature storage temperature symbol v out v lx i lx v ext i ext v ce v dd p d t opr t stg ratings 12 12 400 v ss 0.3~v out +0.3 50 12 12 500 30~+80 40~+125 units v v ma v ma v v mw : : v out v dd v dd ext v ss l x vl x limiter slow start vref phase comp buffer pwm/pfm control osc 50/100/180khz v out ext v ss l x vl x limiter slow start vref phase comp buffer pwm/pfm control osc 50/100/180khz v dd ce chip enable 217
e -55 xc6372 series n electrical characteristics dual mode [pwm/pfm] step-up dc/dc converters xc6372a501pr ta=25 : v out =5.0v,f osc =100kh z xc6372b501pr ta=25 : v out =5.0v,f osc =100kh z measuring conditions: unless otherwise specified,v in =v out 5 0.6, i out =50ma. see typical application circuits, fig.1. parameter output voltage maximum input voltage operation start-up voltage oscillation start-up voltage no load input current supply current 1 (note2) supply current 2 l x switch-on resistance l x leakage current oscillator frequency(note 3) maximum duty ratio pfm duty ratio(note 4) efficiency slow-start time parameter output voltage maximum input voltage operation start-up voltage oscillation start-up voltage v out v in v st1 v st2 i dd 1 i dd 2 rexth rextl fosc maxdty pfmdty effi tss supply current 1 (note1) supply current 2 ext "high" on resistance ext "low" on resistance oscillator frequency (note 2) maximum duty ratio pfm duty ratio (note 3) efficiency slow-start time l x limit voltage symbol v out v in v st1 v st2 i in i dd 1 i dd 2 rswon i lxl fosc maxdty pfmdty effi tss symbol vlxlmt conditions external components connected. i out =1ma. no external components. apply voltage to v out . v in =v out 5 0.8, i out =0ma(note1) lx:10k pull-up to 5v. same as v st 2 . apply output voltage 5 0.95 to vout. same as v st 2 . apply output voltage 5 1.1 to vout. same as i dd 1. vlx=0.4v. no external components. vout=vlx=10v. conditions same as i dd 1. measuring of l x waveform. same as i dd 1. measuring of l x waveform. same as i dd 1. measuring of l x waveform. same as i dd 1. apply output voltage to lx. external components connected. i out =1ma. no external components. apply voltage to vout. same as v st 2 . apply output voltage 5 0.95 to vout. same as v st 2 . apply output voltage 5 1.1 to vout. same as i dd 1. v ext = 0.4v. same as i dd 1. v ext =0.4v. same as i dd 1. measuring of ext waveform. same as i dd 1. measuring of ext waveform. same as i dd 1. measuring of ext waveform. min 4.875 10 85 80 10 4.0 0.7 typ 5.000 12.8 80.2 8.2 1.4 100 87 17 85 10.0 max 5.125 0.90 0.80 25.7 133.8 16.5 2.4 1.0 115 92 25 20.0 1.3 units v v v v a a a a khz % % % ms min typ max units 4.875 5.000 5.125 v 10 v 0.90 v 0.80 v 40.0 66.8 a 8.2 16.5 a 37.5 62.5 30 50 85 100 115 khz 80 87 92 % 10 17 25 % 85 % 4.0 10.0 20.0 ms v 1. the schottky diode (sd) must be type ma735, with reverse current (i r )<1.0 a at reverse voltage (v r )=10.0v 2. "supply current 1" is the supply current while the oscillator is continuously oscillating. in actual operation the oscillato r periodically operates which results in less average power consumption. the current actually provided by an external v in source is represented by "no-load input current(i in )". 3. when pwm operates. 4. when pfm operates. note: measuring conditions: unless otherwise specified,v in =v out 5 0.6, i out =50ma. see typical application circuits, fig.2. 1. "supply current 1" is the supply current while the oscillator is continuously oscillating. in actual operation the oscillato r periodically operates which results in less average power consumption. 2. when pwm operates. 3. when pfm operates. note: voltage required to produce fosc 5 2. 218
e - 56 n electrical characteristics xc6372c501pr ta=25 : v out =5.0v,f osc =100kh z measuring conditions: unless otherwise specified, connect ce to v out , v in =v out 5 0.6, i out =50ma. see typical application circuits, fig.3. parameter output voltage maximum input voltage operation start-up voltage oscillation start-up voltage no load input current supply current 1 (note2) supply current 2 lx switch-on resistance lx leakage current oscillator frequency(note 3) maximum duty ratio pfm duty ratio(note 4) stand-by current ce"high" voltage ce"low" voltage ce"high" current ce"low" current i stb v ceh v cel i ceh i cel same as i dd 1. same as i dd 1. same as i dd 1. same as i dd 1.v ce =v out 5 0.95 same as i dd 1.v ce =0v. 0.75 0.5 0.20 0.25 0.25 a v v a a efficiency slow-start time l x limit voltage v out v in v st1 v st2 i in i dd 1 i dd 2 rswon i lxl fosc maxdty pfmdty external components connected. i out =1ma. no external components. apply voltage to vout. v in =v out 5 0.8, i out =0ma(note1) lx: 10k pull-up to 5v. same as v st 2 . apply output voltage 5 0.95 to v out . same as v st 2 . apply output voltage 5 1.1 to v out . same as i dd 1. vl x =0.4v. no external components. v out =vl x =10v. same as i dd 1. measuring of lx waveform. same as i dd 1. measuring of lx waveform. same as i dd 1. measuring of lx waveform. 4.875 10 85 80 5.000 12.8 80.2 8.2 1.4 100 87 10 17 5.125 0.90 0.80 25.7 133.8 16.5 2.4 1.0 115 92 25 v v v v a a a a khz % % symbol conditions min typ max units effi tss vl x lmt same as i dd 1. apply output voltage to lx. voltage required to produce fosc 5 2. 4.0 0.7 85 10.0 20.0 1.3 % ms v 1. the schottky diode (sd) must be type ma735, with reverse current (ir) < 1.0 a at reverse voltage (vr) =10.0v 2. "supply current 1" is the supply current while the oscillator is continuously oscillating. in actual operation the oscillato r periodically operates which results in less average power comsumption. the current actually provided by an external v in source is represented by "no-load input current (i in )". 3. when pwm operates. 4. when pfm operates. note : 219
e -57 xc6372 series n electrical characteristics dual mode [pwm/pfm] step-up dc/dc converters xc6372d501pr ta=25 : v out =5.0v,f osc =100kh z parameter output voltage maximum input voltage operation start-up voltage oscillation start-up voltage supply current 1 (note1) supply current 2 symbol v out v in v st1 v st2 i dd 1 i dd 2 same as v st2. apply output voltage 5 1.1 to v out . ext"high" on resistance rexth same as i dd 1. vext= 0.4v ext"low" on resistance oscillator frequency (note2) rextl fosc same as i dd 1. vext=0.4v maximum duty ratio maxdty same as i dd 1. measuring of ext waveform. pfm duty ratio (note3) pfmdty same as i dd 1. measuring of ext waveform. stand-by current i stb same as i dd 1. measuring of ext waveform. ce"high" voltage v ceh v cel same as i dd 1. ce"low" voltage i ceh same as i dd 1. ce"high" current i cel same as i dd 1. ce"low" current effi same as i dd 1.v ce =v out 5 0.95. efficiency tss same as i dd 1.v ce =0v. slow-start time conditions external components connected. i out =1ma. no external components. apply voltage to v out . same as v st2. apply output voltage 5 0.95 to v out . min 4.875 10 typ 5.000 max 5.125 0.90 units v 0.80 a 66.8 a 37.5 8.2 40.0 16.5 30 62.5 85 100 50 khz 80 87 115 % 10 17 92 % 25 0.5 a 0.75 v v 0.20 a 0.25 a 0.25 % 85 ms v 4.0 10.0 20.0 v v measuring conditions: unless otherwise specified, connect ce to v out , v in =v out 5 0.6, i out =50ma see typical application circuits,fig.4. 1. "supply current 1" is the current while the oscillator is continuously oscillating. in an actual operation the oscillator pe riodically operates which results in less average power consumption. 2. when pwm operates. 3. when pfm operates. note : 220
e -58 n electrical characteristics XC6372F501PR ta=25 : v out =5.0v,f osc =100kh z parameter output voltage maximum input voltage operation start-up voltage oscillation start-up voltage v out v in v st 1 v st 2 i dd 1 i dd 2 rexth rextl fosc maxdty pfmdty effi tss supply current 1(note1) supply current 2 ext "high" on resistance ext "low" on resistance oscillator frequency(note2) maximum duty ratio pfm duty ratio(note3) efficiency slow-start time symbol conditions external components connected. i out =1ma. no external components. apply voltage to v out . same as v st 2 . apply output voltage 5 0.95 to v out . same as v st 2 . apply output voltage 5 1.1 to v out . same as i dd 1. v ext =v out 0.4v same as i dd 1. v ext =0.4v same as i dd 1. measuring of ext waveform. same as i dd 1. measuring of ext waveform. same as i dd 1. measuring of ext waveform. min typ max units 48.75 5.000 5.125 v 10 v 0.90 v 0.80 v 40.0 66.8 a 8.2 16.5 a 37.5 62.5 30 50 85 100 115 khz 80 87 92 % 10 17 25 % 85 % 4.0 10.0 20.0 ms xc6372e501pr ta=25 : v out =5.0v,f osc =100kh z parameter output voltage maximum input voltage operation start-up voltage oscillation start-up voltage no load input voltage supply current 1(note2) supply current 2 lx switch-on resistance lx leakage current oscillator frequency(note 3) maximum duty ratio pfm duty ratio(note 4) efficiency slow-start time lx limit voltage symbol v out v in v st1 v st2 i in i dd 1 i dd 2 rswon i lxl fosc maxdty pfmdty effi tss vl x lmt conditions external components connected, i out =1ma. no external components. apply voltage to v out. v in =v out 5 0.8,i out =0ma(note1) same as v st 2. apply output voltage 5 0.95 to v out . same as v st 2. apply output voltage 5 1.1 to v out . same as i dd 1. v out =v lx =0.4v. no external components. v out =v lx =10v. same as i dd 1. measuring of lx waveform. same as i dd 1. measuring of lx waveform. same as i dd 1. measuring of lx waveform. same as i dd 1 apply output voltage to lx. voltage required to produce fosc 5 2. min 48.75 10 85 80 10 4.0 0.7 typ 5.000 12.8 80.2 8.2 1.4 100 87 17 85 10.0 max 5.125 0.90 0.80 25.7 133.8 16.5 2.4 1.0 115 92 25 20.0 1.3 units v v v v a a a a khz % % % ms v measuring conditions: unless otherwise specified, connect v dd to v out . v in =v out 5 0.6, i out =50ma. see typical application circuits,fig.5. 1. the schottky diode (sd) must be type ma735, with reverse current (ir)<1.0 a at reverse voltage (vr)=10.0v 2. "supply current 1" is the supply current while the oscillator is continuously oscillating. in actual operation the oscillato r periodically operates which results in less average power consumption. the current actually provided by external v in source is represented by "no-load input current (i in )". 3. when pwm operates. 4. when pfm operates. h when the v dd and v out pins are independently used, the voltage range at the v dd pin should be 2.2v to 10v. the ic operates from v dd =0.8v. however, output voltage and oscillator frequency are properly stabilized when v dd =2.2v or higher. note: measuring conditions: unless otherwise specified,connect v dd to v out, v in =v out 5 0.6, i out =50ma. see typical application circuits,fig.6. 1. "supply current 1" is the supply current while the oscillator is continuously oscillating. in an actual operation the oscill ator periodically operates which results in less average power consumption. 2. when pwm operates. 3. when pfm operates. h when the v dd and v out pins are independently used, the voltage range at the v dd pin should be 2.2v to 10v. the ic operates from v dd =0.8v. however, output voltage and oscillator frequency are properly stabilized when v dd =2.2v or higher. note: 221
l: 100 h (sumida, cd-54) sd: ma735 (schottky diode; matsushita) c l : 16v 47 f (tantalum capacitor, nichicon, f93) l: 47 h (sumida, cd-54) sd: ma735 (schottky diode; matsushita) c l : 16v 47 f (tantalum capacitor, nichicon, f93) r b : 1k , c b :3300pf (fosc=100khz) tr: 2sc3279, 2sd1628g [fig-1] xc6372a application [fig-2] xc6372b application l: 100 h (sumida, cd-54) sd: ma735 (schottky diode; matsushita) c l : 16v 47 f (tantalum capacitor, nichicon, f93) l: 47 h (sumida, cd-54) sd: ma735 (schottky diode; matsushita) c l : 16v 47 f(tantalum capacitor, nichicon, f93) r b : 1k , c b :3300pf (fosc=100khz) tr: 2sc3279, 2sd1628g [fig-3] xc6372c application [fig-4] xc6372d application e -59 xc6372 series dual mode [pwm/pfm] step-up dc/dc converters 2 1 3 n typical application circuits v out cl gnd sot-89 (top view) vin sd l + 2 1 c b t r r b 3 v out cl sot-89 (top view) vin sd l + 2 3 1 45 v out ce cl (top view) sot-89-5 vin sd l + c b t r r b cl vin sd l + 2 3 1 45 v out ce cl (top view) sot-89-5 + gnd gnd gnd 222
e -60 v out cl vin sd gnd l + c b t r r b v out vin l vdd 2 3 1 45 (top view) sot-89-5 cl sd gnd + vdd 2 3 1 45 (top view) sot-89-5 l: 100 h (sumida, cd-54) sd: ma735 (schottky diode; matsushita) c l : 16v 47 f (tantalum capacitor, nichicon, f93) l: 47 h (sumida, cd-54) sd: ma735 (schottky diode; matsushita) c l : 16v 47 f (tantalum capacitor, nichicon, f93) r: 1k , c b :3300pf (fosc=100khz) tr: 2sc3279, 2sd1628g [fig-5] xc6372e application [fig-6] xc6372f application 223
e -61 xc6372 series dual mode [pwm/pfm] step-up dc/dc converters 3.1 2.5 0 40 80 120 160 200 2.7 2.9 xc6372a301 200 0 1.0 1.2 1.4 1.6 1.8 2.0 50 100 150 xc6372a301 100 0 0 40 80 120 160 200 20 40 80 60 xc6372a301 100 0 0 40 80 120 160 200 10 40 80 60 xc6372a301 v in =1.0v 1.5v 2.0v v in =1.0v 1.5v 2.0v v in =1.0v 1.5v 2.0v l=100 h,c=47 f(tantalum) l=100 h,c=47 f(tantalum) l=100 h,c=47 f(tantalum) l=100 h,c=47 f(tantalum) (1)output voltage vs. output current (3)no laod input curent vs. input voltage (4)ripple voltage vs. output current (2)efficiency vs. output current output current:i out (ma) output voltage:v out (v ) output current:i out (ma) efficiency(% ) input voltage:v in (v ) intput current:i in ( a) output current:i out (ma) ripple voltage:vr(mvp-p ) 224
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