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step-up dc/dc controller r1211x series 2001.8.30 rev. 1.10 - 1 - outline the r1211x series are cmos-based pwm step-up dc/dc converter controllers with low supply current. each of the r1211x series consists of an oscillator, a pwm control circuit, a reference voltage unit, an error amplifier, a reference current unit, a protection circuit, and an under voltage lockout (uvlo) circuit. a low ripple, high efficiency step-up dc/dc converter can be composed of this ic with some external components, or an inductor, a diode, a power mosfet, divider resisters, and capacitors. phase compensation has been made internally in the r1211x002b/d series, while phase compensation can be made externally as for r1211x002a/c series. b/d version has stand-by mode. max duty cycle is internally fixed typically at 90%. soft start function is built-in, and soft-starting time is set typically at 9ms(a/b, 700khz version) or 10.5ms(c/d, 300khz version). as for the protection circuit, after the soft-starting time, if the maximum duty cycle is continued for a certain period, the r1211x series latch the external driver with its off state, or latch-type protection circuit works. the delay time for latch the state can be set with an external capacitor. to release the protection circuit, restart with power-on (voltage supplier is equal or less than uvlo detector threshold level), or once after making the circuit be stand-by with chip enable pin and enable the circuit again. features standby current ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? typ. 0a (for b/d version) input voltage range ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 2.5v to 6.0v built-in latch-type protection function (output delay time can be set with an external capacitor) two options of basic oscillator frequency ? ? 300khz, 700khz max duty cycle ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? typ. 90% high reference voltage accuracy ? ? ? ? ? ? ? 1.5% u.v.l.o. threshold level ? ? ? ? ? ? ? ? ? ? ? ? ? typ. 2.2v (hysteresis typ. 0.13v) small package ? ? ? ? ? sot-23-6w or thin (package height max. 0.85mm) son-6 (under development) applications constant voltage power source for portable equipment. constant voltage power source for lcd and ccd.
rev. 1.10 - 2 - block diagrams version a v in ext osc vref latch dtc delay uvlo gnd v fb ampout version b v in ext osc vref latch dtc delay uvlo gnd v fb chip enable ce
rev. 1.10 - 3 - selection guide in the r1211x series, the oscillator frequency, the optional function, and the package type for the ics can be selected at the user?s request. the selection can be made with designating the part number as shown below; r1211x002x-tr a b code contents a designation of package type: d: son-6 n: sot23-6w b designation of optional function a : 700khz, with ampout pin (external phase compensation type) b : 700 khz, with ce pin (internal phase compensation type, with stand-by) c : 300khz, with ampout pin (external phase compensation type) d : 300khz, with ce pin (internal phase compensation type, with stand-by) pin configurations son-6 sot-23-6w vfb delay ampout/ce gnd ext v in vfb delay ampout/ce gnd ext v in (mark side) 12 3 65 4 (mark side) 1 2 3 6 5 4
rev. 1.10 - 4 - pin descriptions pin no. symbol description son6 sot23-6w 1 1 delay pin for external capacitor (for setting output delay of protection) 2 5 gnd ground pin 3 6 ext external fet drive pin (cmos output) 44v in power supply pin 53v fb feedback pin for monitoring output voltage 6 2 ampout or ce amplifier output pin(a/c version) or chip enable pin(b/d version, active at ?h?) absolute maximum ratings symbol item rating unit v in v in pin voltage 6.5 v v ext ext pin output voltage -0.3 v in +0.3 v v dly delay pin voltage -0.3 v in +0.3 v v amp ampout pin voltage -0.3 v in +0.3 v v ce ce pin input voltage -0.3 v in +0.3 v v fb vfb pin voltage -0.3 v in +0.3 v i amp ampout pin current 10 ma i ext ext pin inductor drive output current 50 ma p d power dissipation 250 mw topt operating temperature range -40 +85 c tstg storage temperature range -55 +125 c
rev. 1.10 - 5 - electrical characteristics r1211x002a (topt=25 c) symbol item conditions min. typ. max. unit v in operating input voltage 2.5 6.0 v v fb v fb voltage tolerance v in =3.3v 0.985 1.000 1.015 v ? v fb / ? t v fb voltage temperature coefficient -40 c topt 85 c 150 ppm/ c i fb v fb input current v in =6v, v fb =0v or 6v -0.1 0.1 a f osc oscillator frequency v in =3.3v, v dly =v fb =0v 595 700 805 khz ? f osc / ? t oscillator frequency temperature coefficient -40 c topt 85 c 1.4 khz/ c i dd1 supply current 1 v in =6v, v dly =v fb =0v, ext at no load 600 900 a maxdty maximum duty cycle v in =3.3v, ext ?h? side 82 90 94 % r exth ext ?h? on resistance v in =3.3v, i ext =-20ma 5 10 ? r extl ext ?l? on resistance v in =3.3v, i ext =20ma 3 6 ? i dly1 delay pin charge current v in =3.3v, v dly =v fb =0v 2.5 5.0 7.5 a i dly2 delay pin discharge current v in =v fb =2.5v, v dly =0.1v 2.5 5.5 9.0 ma v dly delay pin detector threshold v in =3.3v, v fb =0v, v dly =0v 2v 0.95 1.00 1.05 v t start soft-start time v in =3.3v at 90% of rising edge 4.5 9.0 13.5 ms v uvlo1 uvlo detector threshold v in =3.3v 0v, v dly =v fb =0v 2.1 2.2 2.3 v v uvlo2 uvlo detector hysteresis v in =0v 3.3v, v dly =v fb =0v 0.08 0.13 0.18 v i amp1 amp ?h? output current v in =3.3v, v amp =1v, v fb =0.9v 0.45 0.90 1.50 ma i amp2 amp ?l? output current v in =3.3v, v amp =1v, v fb =1.1v 30 60 90 a
rev. 1.10 - 6 - r1211x002b (topt=25 c) symbol item conditions min. typ. max. unit v in operating input voltage 2.5 6.0 v v fb v fb voltage tolerance v in =3.3v 0.985 1.000 1.015 v ? v fb / ? t v fb voltage temperature coefficient -40 c topt 85 c 150 ppm/ c i fb v fb input current v in =6v, v fb =0v or 6v -0.1 0.1 a f osc oscillator frequency v in =3.3v, v dly =v fb =0v 595 700 805 khz ? f osc / ? t oscillator frequency temperature coefficient -40 c topt 85 c 1.4 khz/ c i dd1 supply current 1 v in =6v, v dly =v fb =0v, ext at no load 600 900 a maxdty maximum duty cycle v in =3.3v, ext ?h? side 82 90 94 % r exth ext ?h? on resistance v in =3.3v, i ext =-20ma 5 10 ? r extl ext ?l? on resistance v in =3.3v, i ext =20ma 3 6 ? i dly1 delay pin charge current v in =3.3v, v dly =v fb =0v 2.5 5.0 7.5 a i dly2 delay pin discharge current v in =v fb =2.5v, v dly =0.1v 2.5 5.5 9.0 ma v dly delay pin detector threshold v in =3.3v, v fb =0v, v dly =0v 2v 0.95 1.00 1.05 v t start soft-start time v in =3.3v 4.5 9.0 13.5 ms v uvlo1 uvlo detector threshold v in =3.3v 0v, v dly =v fb =0v 2.1 2.2 2.3 v v uvlo2 uvlo detector hysteresis v in =0v 3.3v, v dly =v fb =0v 0.08 0.13 0.18 v i stb standby current v in =6v, v ce =0v 0 1 a i ceh ce ?h? input current v in =6v, v ce =6v -0.5 0.5 a i cel ce ?l? input current v in =6v, v ce =0v -0.5 0.5 a v ceh ce ?h? input voltage v in =6v, v ce =0v 6v 1.5 v v cel ce ?l? input voltage v in =2.5v, v ce =2v 0v 0.3 v
rev. 1.10 - 7 - r1211x002c (topt=25 c) symbol item conditions min. typ. max. unit v in operating input voltage 2.5 6.0 v v fb v fb voltage tolerance v in =3.3v 0.985 1.000 1.015 v ? v fb / ? t v fb voltage temperature coefficient -40 c topt 85 c 150 ppm/ c i fb v fb input current v in =6v, v fb =0v or 6v -0.1 0.1 a f osc oscillator frequency v in =3.3v, v dly =v fb =0v 240 300 360 khz ? f osc / ? t oscillator frequency temperature coefficient -40 c topt 85 c 0.6 khz/ c i dd1 supply current 1 v in =6v, v dly =v fb =0v, ext at no load 300 500 a maxdty maximum duty cycle v in =3.3v, ext ?h? side 82 90 94 % r exth ext ?h? on resistance v in =3.3v, i ext =-20ma 5 10 ? r extl ext ?l? on resistance v in =3.3v, i ext =20ma 3 6 ? i dly1 delay pin charge current v in =3.3v, v dly =v fb =0v 2.0 4.5 7.0 a i dly2 delay pin discharge current v in =v fb =2.5v, v dly =0.1v 2.5 5.5 9.0 ma v dly delay pin detector threshold v in =3.3v, v fb =0v, v dly =0v 2v 0.95 1.00 1.05 v t start soft-start time v in =3.3v 5.0 10.5 16.0 ms v uvlo1 uvlo detector threshold v in =3.3v 0v, v dly =v fb =0v 2.1 2.2 2.3 v v uvlo2 uvlo detector hysteresis v in =0v 3.3v, v dly =v fb =0v 0.08 0.13 0.18 v i amp1 amp ?h? output current v in =3.3v, v amp =1v, v fb =0.9v 0.45 0.90 1.50 ma i amp2 amp ?l? output current v in =3.3v, v amp =1v, v fb =1.1v 25 50 75 a
rev. 1.10 - 8 - r1211x002d symbol item conditions min. typ. max. unit v in operating input voltage 2.5 6.0 v v fb v fb voltage tolerance v in =3.3v 0.985 1.000 1.015 v ? v fb / ? t v fb voltage temperature coefficient -40 c topt 85 c 150 ppm/ c i fb v fb input current v in =6v, v fb =0v or 6v -0.1 0.1 a f osc oscillator frequency v in =3.3v, v dly =v fb =0v 240 300 360 khz ? f osc / ? t oscillator frequency temperature coefficient -40 c topt 85 c 0.6 khz/ c i dd1 supply current 1 v in =6v, v dly =v fb =0v, ext at no load 300 500 a maxdty maximum duty cycle v in =3.3v, ext ?h? side 82 90 94 % r exth ext ?h? on resistance v in =3.3v, i ext =-20ma 5 10 ? r extl ext ?l? on resistance v in =3.3v, i ext =20ma 3 6 ? i dly1 delay pin charge current v in =3.3v, v dly =v fb =0v 2.0 4.5 7.0 a i dly2 delay pin discharge current v in =v fb =2.5v, v dly =0.1v 2.5 5.5 9.0 ma v dly delay pin detector threshold v in =3.3v, v fb =0v, v dly =0v 2v 0.95 1.00 1.05 v t start soft-start time v in =3.3v 5.0 10.5 16.0 ms v uvlo1 uvlo detector threshold v in =3.3v 0v, v dly =v fb =0v 2.1 2.2 2.3 v v uvlo2 uvlo detector hysteresis v in =0v 3.3v, v dly =v fb =0v 0.08 0.13 0.18 v i stb standby current v in =6v, v ce =0v 0 1 a i ceh ce ?h? input current v in =6v, v ce =6v -0.5 0.5 a i cel ce ?l? input current v in =6v, v ce =0v -0.5 0.5 a v ceh ce ?h? input voltage v in =6v, v ce =0v 6v 1.5 v v cel ce ?l? input voltage v in =2.5v, v ce =2v 0v 0.3 v
rev. 1.10 - 9 - typical applications and technical notes c3 inductor diode nmos v in ext delay vfb gnd ampout c1 c2 c4 r1 r2 r3 c5 r4 nmos: irf7601 (international rectifier) inductor : ldr655312t-100 10 h (tdk) for r1211x002a : ldr655312t-220 22 h (tdk) for r1211x002c diode: crs02 (toshiba) c1: 4.7 f (ceramic) r1: output voltage setting resistor 1 c2: 0.22 f (ceramic) r2: output voltage setting resistor 2 c3: 10 f (ceramic) r3: 30k ? c4: 680pf(ceramic) r4: 30k ? c5: 2200pf(ceramic) inductor diode nmos vin ext delay vfb gnd ce c1 c2 c3 c4 r1 r2 r3 ce control nmos: irf7601 (international rectifier) inductor: ldr655312t-100 10 h (tdk) for r1211x002b ldr655312t-220 22 h (tdk) for r1211x002d diode: crs02 (toshiba) c1: 4.7 f (ceramic) r1: setting output voltage resistor1 c2: 0.22 f (ceramic) r2: setting output voltage resistor2 c3: 10 f (ceramic) r3 : 30k ? c4: 680pf(ceramic) [note] these example circuits may be applied to the output voltage requirement is 15v or less. if the output voltage requirement is 15v or more, ratings of nmos and diode as shown above is over the limit, therefore, choose other external components.
rev. 1.10 - 10 - use a 1 f or more capacitance value of bypass capacitor between v in pin and gnd, c1 as shown in the typical applications above. in terms of the capacitor for setting delay time of the latch protection, c2 as shown in typical applications of the previous page, connect between delay pin and gnd pin of the ic with the minimum wiring distance. connect a 1 f or more value of capacitor between v out and gnd, c3 as shown in typical applications of the previous page. (recommended value is from 10 f to 22 f.) if the operation of the composed dc/dc converter may be unstable, use a tantalum type capacitor instead of ceramic type. connect a capacitor between v out and the dividing point, c4 as shown in typical applications of the previous page. the capacitance value of c4 depends on divider resistors for output voltage setting. typical value is between 100pf and 1000pf. output voltage can be set with divider resistors for voltage setting, r1 and r2 as shown in typical applications of the previous page. refer to the next formula. output voltage = v fb (r1+r2)/r2 r1+r2=100k ? is recommended range of resistances. the operation of latch protection circuit is as follows: when the ic detects maximum duty cycle, charge to an external capacitor, c2 of delay pin starts. and maximum duty cycle continues and the voltage of delay pin reaches delay voltage detector threshold, v dly , outputs ?l? to ext pin and turns off the external power mosfet. to release the latch protection operation, make the ic be standby mode with ce pin and make it active in terms of b/d version. otherwise, restart with power on. the delay time of latch protection can be calculated with c2, v dly , and delay pin charge current, i dly1 , as in the next formula. t=c2 v dly /i dly1 once after the maximum duty is detected and released before delay time, charge to the capacitor is halt and delay pin outputs ?l?. as for r1211x002a/c version, the values and positioning of c4, c5, r3, and r4 shown in the above diagram are just an example combination. these are for making phase compensation. if the spike noise of v out may be large, the spike noise may be picked into v fb pin and make the operation unstable. in this case, a resistor r3, shown in typical applications of the previous page. the recommended resistance value of r3 is in the range from 10k ? to 50k ? . then, noise level will be decreased. as for r1211x002b/d version, ext pin outputs gnd level at standby mode. select the power mosfet, the diode, and the inductor within ratings (voltage, current, power) of this ic. choose the power mosfet with low threshold voltage depending on input voltage to be able to turn on the fet completely. choose the diode with low v f such as shottky type, and with low reverse current i r, and with fast switching speed. when an external transistor is switching, spike voltage may be generated caused by an inductor, therefore recommended voltage tolerance of capacitor connected to v out is three times of setting voltage or more. ? the performance of power circuit with using this ic depends on external components. choose the most suitable components for your application.
rev. 1.10 - 11 - output current and selection of external components inductor diode c l lx tr v in v out i out ilxmax ilxmin ton toff t=1/fosc tf il discontinuous mode t ilxmax ilxmin ton toff t=1/fosc t il iconst continuous mode gnd i1 i2 there are two modes, or discontinuous mode and continuous mode for the pwm step-up switching regulator depending on the continuous characteristic of inductor current. during on time of the transistor, when the voltage added on to the inductor is described as v in , the current is v in t/l. therefore, the electric power, p on , which is supplied with input side, can be described as in next formula. t on p on = v in 2 t/l dt formula 1 0 with the step-up circuit, electric power is supplied from power source also during off time. in this case, input current is described as (v out -v in ) t/l, therefore electric power, p off is described as in next formula. tf p off = v in (v out -v in ) t/l dt formula 2 0 in this formula, tf means the time of which the energy saved in the inductance is being emitted. thus average electric power, p av is described as in the next formula. t on tf p av =1/(ton+toff) { v in 2 t/l dt + v in (v out -v in ) t/l dt} formula 3 0 0 in pwm control, when tf=toff is true, the inductor current becomes continuos, then the operation of switching regulator becomes continuous mode. in the continuous mode, the deviation of the current is equal between on time and off time. v in ton/l=(v out -v in ) toff/l formula 4 further, the electric power, p av is equal to output electric power, v out i out , thus, i out = f osc v in 2 t on 2 /{2 l (v out -v in )}=v in 2 t on /(2 l v out )formula 5 when i out becomes more than formula 5, the current flows through the inductor, then the mode becomes
rev. 1.10 - 12 - continuous. the continuous current through the inductor is described as iconst, then, i out = f osc v in 2 t on 2 /(2 l (v out -v in ))+v in iconst/v out formula 6 in this moment, the peak current, ilxmax flowing through the inductor and the driver tr. is described as follows: ilxmax = iconst +v in ton/l formula 7 with the formula 4,6, and ilxmax is, ilxmax = v out /v in i out +v in ton/(2 l) formula 8 therefore, peak current is more than i out . considering the value of ilxmax, the condition of input and output, and external components should be selected. in the formula 7, peak current ilxmax at discontinuous mode can be calculated. put iconst=0 in the formula. the explanation above is based on the ideal calculation, and the loss caused by lx switch and external components is not included. the actual maximum output current is between 50% and 80% of the calculation. especially, when the ilx is large, or v in is low, the loss of v in is generated with the on resistance of the switch. as for v out, vf (as much as 0.3v) of the diode should be considered. timing chart r1211x002a/r1211x002c ext v out ss vref pwm comparator op amp v fb a mpout dtc r1 r2 ext r1211x002b/r1211x002d ext v out ss vref pwm comparator op amp v fb a mpout dtc r1 r2 ext soft-start operation is starting from power-on as follows: (step1) the voltage level of ss is rising gradually by constant current circuit of the ic and a capacitor. v ref level which is input to op amp is also gradually rising. v out is rising up to input voltage level just after the power-on, therefore, v fb voltage is rising up to the setting voltage with input voltage and the ration of r1 and r2. ampout is at ?l?, and switching does not start. (step2)
rev. 1.10 - 13 - when the voltage level of ss becomes the setting voltage with the ration of r1 and r2 or more, switching operation starts. v ref level gradually increases together with ss level. v out is also rising with balancing v ref and v fb . duty cycle depends on the lowest level among ampout, ss, and dtc of the 4 input terminals in the pwm comparator. (step3) when ss reaches 1v, soft-start operation finishes. v ref becomes constant voltage (=1v). then the switching operation becomes normal mode. v in v out ss , vref v fb ss v fb ,vref a mpout step1 step2 dtc a mpout the operation of latch protection circuit is as follows: when ampout becomes ?h? and the ic detects maximum duty cycle, charge to an external capacitor, c2 of delay pin starts. and maximum duty cycle continues and the voltage of delay pin reaches delay voltage detector threshold, v dly , outputs ?l? to ext pin and turns off the external power mosfet. to release the latch protection operation, make the ic be standby mode with ce pin and make it active in terms of r1211x002b/d version. otherwise, make supply voltage down to uvlo detector threshold or lower, and make it rise up to the normal input voltage. during the soft-start time, if the duty cycle may be the maximum, protection circuit does not work and delay pin is fixed at gnd level. the delay time of latch protection can be calculated with c2, v dly , and delay pin charge current, i dly1 , as in the next formula. t=c2 v dly /i dly1 once after the maximum duty is detected and released before delay time, charge to the capacitor is halt and delay pin outputs ?l?. v dly a mpout normal maxduty operation latched dtc a mpout delay output short ext
rev. 1.10 - 14 - test circuits r1211x002a/r1211x002c *oscillator frequency, maximum duty cycle, v fb voltage test *consumption current test 3.3v v in ext v f b gnd delay os os os osc c c cillosc illosc illosc illosco o o ope pe pe pe 6v a v in v f b gnd delay *ext ?h? on resistance *ext ?l? on resistance 3.3v v in ext v fb gnd 150 ? os os os osc c c cillosc illosc illosc illosc o o o o pe pe pe pe delay 3.3v 150 ? v v in ext v fb delay gnd *delay pin charge current *delay pin discharge current v in v fb delay gnd 3.3v a 2.5v 0.1v v in v fb delay gnd a
rev. 1.10 - 15 - *delay pin detector threshold voltage test *amp ?h? output current/?l? output current test 3.3v v in ext v fb delay gnd os os os osc c c cillosc illosc illosc illosc o o o o pe pe pe pe 3.3v v in ampout v fb delay gnd a 1v *uvlo detector threshold/hysteresis range test v in ext v fb delay gnd os os os osc c c cillosc illosc illosc illosc o o o ope pe pe pe *soft-start time test rout v in ext ampout v fb gnd delay coil diode c1 r1 r2 c2 nmos c3 r3 r4 c4 c5 v out os os os osc c c cillosc illosc illosc illoscope ope ope ope inductor (l) : 22 h (tdk ldr655312t-220) diode (sd) : crs02 (toshiba) capacitors c1: 680pf(ceramic), c2: 22 f (tantalum)+2.2 f (ceramic), c3: 68 f (tantalum)+2.2 f (ceramic), c4: 2200pf(ceramic), c5: 22 f(tantalum) nmos transistor : irf7601 (international rectifier) resistors : r1: 90k ? , r2:10k ? , r3:30k ? , r4:30k ? , rout:1k ? /330 ?
rev. 1.10 - 16 - r1211x002b/r1211x002d *oscillator frequency, maximum duty cycle, v fb voltage test *consumption current test 3.3v os os os osc c c cillosc illosc illosc illoscope ope ope ope v in ext ce v fb gnd delay 6v a v in ce v fb gnd delay *ext ?h? on resistance *ext ?l? on resistance 3.3v v in ext ce v fb gnd delay 150 ? os os os osc c c cillosc illosc illosc illoscope ope ope ope 3.3v 150 ? v v in ext ce v fb gnd delay *delay pin charge current *delay pin discharge current 3.3v v in ce v fb gnd delay a 2.5v 0.1v v in ce v fb gnd delay a
rev. 1.10 - 17 - *delay pin detector threshold voltage test *standby current test 3.3v v in ext ce v fb gnd delay os os os osc c c cillosc illosc illosc illoscope ope ope ope 6v a v in ce v fb gnd delay *uvlo detector threshold/hysteresis range test * ce ?l? input current/?h? input current test v in ext ce v fb gnd delay os os os osc c c cillosc illosc illosc illoscope ope ope ope a v in ce v fb gnd delay 0v/6v *ce ?l? input voltage/?h? input voltage test v in ext ce v fb gnd delay os os os osc c c cillosc illosc illosc illosco o o ope pe pe pe *soft-start time test rout v in ext ce v fb gnd delay coil c1 r1 r2 c2 nmos c3 r3 c5 0v/3.3v os os os osc c c cillosc illosc illosc illosco o o ope pe pe pe v out
rev. 1.10 - 18 - inductor (l) : 22 h (tdk ldr655312t-220) diode (sd) : crs02 (toshiba) capacitors c1: 680pf(ceramic), c2: 22 f (tantalum)+2.2 f (ceramic), c3: 68 f (tantalum)+2.2 f (ceramic), c5: 22 f (tantalum) nmos transistor : irf7601 (international rectifier) resistors : r1: 90k ? , r2: 10k ? , r3: 30k ? typical characteristics 1) output voltage vs. output current 4.9 5 5.1 1 10 100 1000 output current i out [ma] output voltage v out [v] v in =2.5v v in =3.3v r1211x002a l=10uh v out =5v 9.8 10 10.2 1 10 100 1000 output current i out [ma] output voltage v out [v] r1211x002a l=10uh vout=10v v in =2.5v v in =3.3v v in =5.0v 14.7 15 15.3 1 10 100 1000 output current i out [ma] output voltage v out [v] r1211x002a l=10uh v out =15v v in =2.5v v in =3.3v v in =5.0v 4.9 5 5.1 1 10 100 1000 output current i out [ma] output voltage v out [v] r1211x002b l=10uh v out =5v v in =2.5v v in =3.3v 9.8 10 10.2 1 10 100 1000 output current i out [ ma] output voltage v out [v] r1211x002b l=10uh v out =10v v in =2.5v v in =3.3v v in =5.0v 14.7 15 15.3 1 10 100 1000 output current i out [ma] output voltage v out [v] r1211x002b l=10uh v out =15v v in =2.5v v in =3.3v v in =5.0v
rev. 1.10 - 19 - 4.9 5 5.1 1 10 100 1000 output current i out [ma] output voltage v out [v] vin=2.5v vin=3.3v r1211x002c l=22uh v out =5v 9.8 10 10.2 1 10 100 1000 output current i out [ma] output voltage v out [v] vin=2.5v vin=3.3v vin=5.0v r1211x002c l=22uh v out =10v 14.7 15 15.3 1 10 100 1000 output current i out [ma] output voltage v out [v] vin=2.5v vin=3.3v vin=5.0v r1211x002c l=22uh v out =15v 4.9 5 5.1 1 10 100 1000 output current i out [ma] output voltage v out [v] r1211x002d l=22uh v out =5v v in =2.5v v in =3.3v 9.8 10 10.2 1 10 100 1000 output current i out [ma] output voltage v out [v] r1211x002d l=22uh v out =10v v in =2.5v v in =3.3v v in =5.0v 14.7 15 15.3 1 10 100 1000 output current i out [ma] output voltage v out [v] v in =2.5v v in =3.3v v in =5.0v r1211x002d l=22uh v out =15v
rev. 1.10 - 20 - 2) efficiency vs. output current 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] r1211x002a l=10uh v out =5v v in =2.5v v in =3.3v 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] v in =2.5v v in =3.3v v in =5.0v r1211x002a l=10uh v out =10v 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] r1211x002a l=10uh v out =15v v in =2.5v v in =3.3v v in =5.0v 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] r1211x002b l=10uh v out =5v v in =2.5v v in =3.3v 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] r1211x002b l=10uh v out =10v v in =2.5v v in =3.3v v in =5.0v 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] r1211x002b l=10uh v out =15v v in =2.5v v in =3.3v v in =5.0v
rev. 1.10 - 21 - 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] vin=2.5v vin=3.3v r1211x002c l=22uh v out =5v 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] vin=2.5v vin=3.3v vin=5.0v r1211x002c l=22uh v out =10v 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] vin=2.5v vin=3.3v vin=5.0v r1211x002c l=22uh v out =15v 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] r1211x002d l=22uh v out =5v v in =2.5v v in =3.3v 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] r1211x002d l=22uh v out =10v v in =2.5v v in =3.3v v in =5.0v 0 20 40 60 80 100 1 10 100 1000 output current i out [ma] efficiency [% ] v in =2.5v v in =3.3v v in =5.0v r1211x002d l=22uh v out =15v
rev. 1.10 - 22 - 3) v fb voltage vs. input voltage (topt =25 c) 985 990 995 1000 1005 1010 1015 23456 input voltage v in [v] vfb voltage [mv] r1211x002x 4) oscillator frequency vs. input voltage (topt=25 c) 500 600 700 800 900 23456 input voltage v in [v] oscillator frequency [khz] r1211x002a/b 200 250 300 350 400 23456 input voltage v in [v] oscillator frequency[khz] r1211x002c/d 5) supply current vs. input voltage (topt=25 c) 0 100 200 300 400 500 600 23456 input voltage v in [v] supply current [ua] r1211x002a 0 100 200 300 400 500 600 23456 input voltage v in [v] supply current [ua] r1211x002b
rev. 1.10 - 23 - 0 100 200 300 400 23456 input voltage v in [v] supply current [ua] r1211x002c 0 100 200 300 400 23456 input voltage v in [v] supply current [ua] r1211x002d 6) maximum duty cycle vs. input voltage (topt=25 c) 80 82 84 86 88 90 92 94 96 23456 input voltage v in [v] maximum duty cycle [%] r1211x002a/b 80 82 84 86 88 90 92 94 96 23456 input voltage v in [v] maximum duty cycle [%] r1211x002c/d 7) v fb voltage vs. temperature 985 990 995 1000 1005 1010 1015 -50 -25 0 25 50 75 100 temperature topt vfb voltage [mv] r1211x002x v in =3.3v ( c)
rev. 1.10 - 24 - 8) oscillator frequency vs. temperature 500 600 700 800 900 -50 -25 0 25 50 75 100 temperature topt oscillator frequency[khz] r1211x002a/b v in =3.3v 200 250 300 350 400 -50 -25 0 25 50 75 100 temperature topt oscillator frequency [khz] r1211x002c/d v in =3.3v 9) supply current vs. temperature 0 100 200 300 400 500 600 -50 -25 0 25 50 75 100 temperature topt supply current[ua] r1211x002a v in =3.3v 0 100 200 300 400 500 600 -50 -25 0 25 50 75 100 temperature topt supply current [ua] r1211x002b v in =3.3v 0 100 200 300 400 -50 -25 0 25 50 75 100 temperature topt supply current [ua] r1211x002c v in =3.3v 0 100 200 300 400 -50 -25 0 25 50 75 100 temperature topt supply current [ua] r1211x002d v in =3.3v ( c) ( c) ( c) ( c) ( c) ( c) ( c)
rev. 1.10 - 25 - 10) maximum duty cycle vs. temperature 80 82 84 86 88 90 92 94 96 -50 -25 0 25 50 75 100 temperature topt maximum duty cycle [%] r1211x002a/b v in =3.3v 80 82 84 86 88 90 92 94 96 -50 -25 0 25 50 75 100 temperature topt maximum duty cycle [%] r1211x002c/d v in =3.3v 11) ext?h? output current vs. temperature 2 3 4 5 6 7 8 -50 -25 0 25 50 75 100 temperature topt ext"h"on resistance [ohm] r1211x002x v in =3.3v 12) ext?l? output current vs. temperature 1 2 3 4 5 -50 -25 0 25 50 75 100 temperature topt ext"l"on resistance [ohm] r1211x002x v in =3.3v ( c) ( c) ( c) ( c)
rev. 1.10 - 26 - 13) soft-start time vs. temperature 6 8 10 12 14 16 -50 -25 0 25 50 75 100 temperature topt soft-start time [ms] r1211x002a/b v in =3.3v 6 8 10 12 14 16 -50 -25 0 25 50 75 100 temperature topt soft-start time [ms] r1211x002c/d v in =3.3v 14) uvlo detector threshold vs. temperature 2100 2150 2200 2250 2300 -50 -25 0 25 50 75 100 temperature topt uvlo detector threshold [mv] r1211x002x v in =3.3v 15) amp ?h? output current vs. temperature 400 600 800 1000 1200 1400 1600 -50 -25 0 25 50 75 100 temperature topt amp"h" output current [ua] r1211x002a/c v in =3.3v ( c) ( c) ( c) ( c)
rev. 1.10 - 27 - 16) amp ?l? output current vs. temperature 20 30 40 50 60 70 80 -50 -25 0 25 50 75 100 temperature topt amp"l" output current [ua] r1211x002a v in =3.3v 20 30 40 50 60 70 80 -50 -25 0 25 50 75 100 temperature topt amp"l" output current [ua] r1211x002c v in =3.3v 17) delay pin charge current vs. temperature 2 3 4 5 6 7 -50 -25 0 25 50 75 100 temperature topt delay pin charge current [ua] r1211x002a/b v in =3.3v 2 3 4 5 6 7 -50 -25 0 25 50 75 100 temperature topt delay pin charge current [ua] r1211x002c/d v in =3.3v 18) delay pin detector threshold vs. temperature 960 980 1000 1020 1040 -50 -25 0 25 50 75 100 temperature topt delay pin detector threshold [mv] r1211x002x v in =3.3v ( c) ( c) ( c) ( c) ( c)
rev. 1.10 - 28 - 19) delay pin discharge current vs. temperature 0 2 4 6 8 10 -50 -25 0 25 50 75 100 temperature topt delay pin discharge current [ua] r1211x002x v in =2.5v 20) ce ?l? input voltage vs. temperature 600 700 800 900 1000 1100 1200 -50 -25 0 25 50 75 100 temperature topt ce"l" input voltage [mv] r1211x002b/d v in =2.5v 21) ce ?h? input voltage vs. temperature 600 700 800 900 1000 1100 1200 -50 -25 0 25 50 75 100 temperature topt ce"h" input voltage [mv] r1211x002b/d v in =6.0v ( c) ( c) ( c)
rev. 1.10 - 29 - 22) standby current vs. temperature -0.2 0 0.2 0.4 0.6 0.8 1 -50 -25 0 25 50 75 100 temperature topt standby current [ua] r1211x002b/d v in =6.0v 23) load transient response ( c) 4.4 5.0 5.6 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] r1211x002a l=10uh v in =3.3v , c3=22uf v out =5v , i out =1-100ma v out i out 8.8 10.0 11.2 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] r1211x002a l=10uh v in =3.3v , c3=22uf v out =10v , i out =1-100ma v out i out 13.2 15.0 16.8 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] r1211x002a l=10uh v in =3.3v , c3=22uf v out =15v , i out =1-50ma v out i out
rev. 1.10 - 30 - 4.4 5.0 5.6 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] l=10uh v in =3.3v , c3=22uf v out =5v , i out =1-100ma r1211x002b v out i out 8.8 10.0 11.2 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] l=10uh v in =3.3v , c3=22uf v out =10v , i out =1-100ma r1211x002b v out i out 13.2 15.0 16.8 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] l=10uh v in =3.3v , c3=22uf v out =15v , i out =1-50ma r1211x002b v out i out 4.4 5.0 5.6 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] l=22uh v in =3.3v , c3=22uf v out =5v , i out =1-100ma r1211x002c v out i out
rev. 1.10 - 31 - 4.4 5.0 5.6 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] l=22uh v in =3.3v , c3=22uf v out =5v , i out =1-100ma r1211x002d v out i out 8.8 10.0 11.2 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] l=22uh v in =3.3v , c3=22uf v out =10v , i out =1-100ma r1211x002d v out i out 8.8 10.0 11.2 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] l=22uh v in =3.3v , c3=22uf v out =10v , i out =1-100ma r1211x002c v out i out 13.2 15.0 16.8 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] l=22uh v in =3.3v , c3=22uf v out =15v , i out =1-50ma r1211x002c v out i out
rev. 1.10 - 32 - 24) power-on response 0 2 4 6 8 10 12 14 16 0 5 10 15 20 25 time [5ms/div] output voltage [v] r1211x002a l=10uh v in =3.3v , i out =10ma (a)v out =5v (b)v out =10v (c)v out =15v v in 0 2 4 6 8 10 12 14 16 0 5 10 15 20 25 time [5ms/div] output voltage [v ] r1211x002b l=10uh v in =3.3v , i out =10ma (a)v out =5v (b)v out =10v (c)v out =15v v in 0 2 4 6 8 10 12 14 16 0 5 10 15 20 25 time [5ms/div] output voltage [v ] r1211x002c l=22uh v in =3.3v , i out =10ma (a)v out =5v (b)v out =10v (c)v out =15v v in 0 2 4 6 8 10 12 14 16 0 5 10 15 20 25 time [5ms/div] output voltage [v] r1211x002d l=22uh v in =3.3v , i out =10ma (a)v out =5v (b)v out =10v (c)v out =15v v in 13.2 15.0 16.8 time [5ms/div] output voltage v out [v] 0 100 200 300 output current i out [ma] l=22uh v in =3.3v , c3=22uf v out =15v , i out =1-50ma r1211x002d v out i out
rev. 1.10 - 33 - 25) turn-on speed with ce pin 0 2 4 6 8 10 12 14 16 0 5 10 15 20 25 time [5ms/div] output voltage [v ] r1211x002b l=10uh v in =3.3v , i out =10ma (a)v out =5v (b)v out =10v (c)v out =15v ce 0 2 4 6 8 10 12 14 16 0 5 10 15 20 25 time [5ms/div] output voltage [v] r1211x002d l=22uh v in =3.3v , i out =10ma (a)v out =5v (b)v out =10v (c)v out =15v ce

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