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step-down dc/dc converter with voltage detector r1221n series 99.12.8 1 1 1 12 2 2 23 3 3 345 45 45 45 12345 rev. 1.11 - 1 - n n n n outline the r1221n series are pwm step-down dc/dc converter controllers embedded with a voltage detector, with low supply current by cmos process. each step-down dc/dc converter in these ics consists of an oscillator, a pwm control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, a protection circuit, a pwm/vfm alternative circuit, a chip enable circuit, and resistors for voltage detection. a low ripple, high efficiency step-down dc/dc converter can be composed of this ic with only four external components, or a power-transistor, an inductor, a diode and a capacitor. the output voltage of dc/dc converter can be supervised by the built-in voltage detector. with a pwm/vfm alternative circuit, when the load current is small, the operation turns into the vfm oscillator from pwm oscillator automatically, therefore the efficiency at small load current is improved. and the pwm/vfm alternative circuit is an option, in terms of c version and d version, the circuit is not included. if the term of maximum duty cycle keeps on a certain time, the embedded protection circuit works. there are two types of protection function. one is latch-type protection circuit, and it works to latch an external power mos with keeping it disable. to release the condition of protection, after disable this ic with a chip enable circuit, enable it again, or restart this ic with power-on. the other is reset-type protection circuit, and it works to restart the operation with soft-start and repeat this operation until maximum duty cycle condition is released. either of these protection circuits can be designated by users request. n n n n features l wide range of input voltage 2.3v to 13.2v l built-in soft-start function and two choices of protection function(latch-type or reset-type) l two choices of oscillator frequency 300khz, 500khz l high efficiency typ. 90% l standby current typ. 0a l setting output voltage stepwise setting with a step of 0.1v in the range of 1.5v to 5.0v l high accuracy output voltage 2.0% l setting detector threshold voltage stepwise setting with a step of 0.1v in the range of 1.2v to 4.5v l high accuracy detector threshold voltage 2.0% l low temperature-drift coefficient of output voltage typ. 100ppm/ c n n n n applications l power source for hand-held communication equipment, cameras, video instruments such as vcrs, camcorders. l power source for battery-powered equipment. l power source for household electrical appliances.
12345 rev. 1.11 - 2 - n block diagram osc v in ext gnd v out vref vref ce chip enable soft start protection pwm/vfm control vd out n selection guide in the r1221n series, the output voltage, the detector threshold, the oscillator frequency, the optional function, and the taping type for the ics can be selected at the users request. the selection can be made by designating the part number as shown below; r1221nxxxx-tr - - - a b c code contents a setting output voltage(v out ): stepwise setting with a step of 0.1v in the range of 1.5v to 5.0v is possible. b setting detector threshold(-v det ) stepwise setting with a step of 0.1v in the range of 1.2v to 4.5v is possible. a:3.0v c designation of oscillator frequency and optional function a:300khz, with a pwm/vfm alternative circuit, latch-type protection b:500khz, with a pwm/vfm alternative circuit, latch-type protection c:300khz, without a pwm/vfm alternative circuit, latch-type protection d:500khz, without a pwm/vfm alternative circuit, latch-type protection e:300khz, with a pwm/vfm alternative circuit, reset-type protection f:500khz, with a pwm/vfm alternative circuit, reset-type protection g:300khz, without a pwm/vfm alternative circuit, reset-type protection h:500khz, without a pwm/vfm alternative circuit, reset-type protection
12345 rev. 1.11 - 3 - n n n n pin configuration l sot-23-6w 12 3 4 6 v out gnd ce ext vd out v in (mark side) 5 n n n n pin description pin no. symbol description 1 ext external transistor drive pin (output type ; cmos) 2vd out voltage detector output pin (output type ; nch open drain ) 3v in power supply pin 4 ce chip enable pin 5 gnd ground pin 6v out pin for monitoring output voltage n n n n absolute maximum rating symbol item rating unit v in v in supply voltage 15 v v ext ext pin output voltage -0.3 ~ v in +0.3 v v ce ce pin input voltage -0.3 ~ v in +0.3 v vd out vd out pin output voltage -0.3 ~ 15 v v out v out pin input voltage -0.3 ~ v in +0.3 v i ext ext pin inductor drive output current 25 ma p d power dissipation 250 mw topt operating temperature range -40 ~ +85 c tstg storage temperature range -55 ~ +125 c
12345 rev. 1.11 - 4 - n n n n electrical characteristics l r1221n***a(c,e,g) output voltage : vo, detector threshold : v d (topt=25 c) symbol item conditions min. typ. max. note* unit v in operating input voltage 2.3 13.2 v v out step-down output voltage v in =v ce =vo+1.2v, i out =-10ma vo 0.98 vo vo 1.02 av d v out / d t step-down output voltage temperature coefficient -40 c topt 85 c 100 ppm/ c fosc oscillator frequency v in =v ce =vo+1.2v, i out =-100ma 240 300 360 a khz d f osc / d t frequency temperature coefficient -40 c topt 85 c 0.3 %/ c i dd1 supply current1 v in =13.2v,v ce =13.2v,v out =13.2v 100 160 b m a i stb standby current v in =13.2v,v ce =0v,v out =0v 0 0.5 c m a i exth ext "h" output current v in =8v,v ext =7.9v,v out =8v,v ce =8v -10 -6 d ma i extl ext "l" output current v in =8v,v ext =0.1v,v out =0v,v ce =0v 10 20 d ma i ceh ce "h" input current v in =13.2v,v ce =13.2v,v out =13.2v 0 0.5 e m a i cel ce "l" input current v in =13.2v,v ce =0v,v out =13.2v -0.5 0 e m a v ceh ce "h" input voltage v in =8v,v ce =0v ? 1.5v 0.8 1.2 f v v cel ce "l" input voltage v in =8v,v ce =1.5v ? 0v 0.3 0.8 f v maxdty oscillator maximum duty cycle 100 % vfmdty vfm duty cycle applied to b and f versions only 25 % t start delay time by soft-start function v in =vo+1.2v,v ce =0v ? vo+1.2v at 80% of rising 5 1016fms t prot delay time for protection circuit v in =vo+1.2v,v ce =vo+1.2v ? 0v 135gms i vdlk vd out output leakage current v in =v out =v ce =v dout =8v 0 0.5 i m a i vdl vd out l output current v in =v out =2.3v, v ce =0v, v dout =0.1v 0.5 1 i ma -v det detector threshold v in =6v, v ce =6v, v out =v d 1.2v ? 0v v d 0.98 v d v d 1.02 jv tv det output delay time for released voltage v in =6v, v ce =6v, v out =0v ? v d 1.2v at 80% of rising 2510jms v hys detector threshold hysteresis v in =6v, v ce =6v, v out =0v ? v d 1.2v v d 0.01 v d 0.03 v d 0.05 jmv d - v det / d t detector threshold temperature coefficient -40 c topt 85 c 100 ppm/ c note: refer to test circuits
12345 rev. 1.11 - 5 - l r1221n***b(d,f,h) output voltage : vo, detector threshold : v d (topt=25 c) symbol item conditions min. typ. max. note* unit v in operating input voltage 2.3 13.2 v v out step-down output voltage v in =v ce =vo+1.2v, i out =-10ma vo 0.98 vo vo 1.02 av d v out / d t step-down output voltage temperature coefficient -40 c topt 85 c 100 ppm/ c fosc oscillator frequency v in =v ce =vo+1.2v, i out =-100ma 400 500 600 a khz d f osc / d t frequency temperature coefficient -40 c topt 85 c 0.3 %/ c i dd1 supply current1 v in =13.2v,v ce =13.2v,v out =13.2v 140 200 b m a i stb standby current v in =13.2v,v ce =0v,v out =0v 0 0.5 c m a i exth ext "h" output current v in =8v,v ext =7.9v,v out =8v,v ce =8v -10 -6 d ma i extl ext "l" output current v in =8v,v ext =0.1v,v out =0v,v ce =0v 10 20 d ma i ceh ce "h" input current v in =13.2v,v ce =13.2v,v out =13.2v 0 0.5 e m a i cel ce "l" input current v in =13.2v,v ce =0v,v out =13.2v -0.5 0 e m a v ceh ce "h" input voltage v in =8v,v ce =0v ? 1.5v 0.8 1.2 f v v cel ce "l" input voltage v in =8v,v ce =1.5v ? 0v 0.3 0.8 f v maxdty oscillator maximum duty cycle 100 % vfmdty vfm duty cycle applied to b and f versions only 25 % t start delay time by soft-start function v in =vo+1.2v,v ce =0v ? vo+1.2v at 80% of rising 3610fms t prot delay time for protection circuit v in =vo+1.2v,v ce =vo+1.2v ? 0v 124gms i vdlk vd out output leakage current v in =v out =v ce =v dout =8v 0 0.5 i m a i vdl vd out l output current v in =v out =2.3v,v ce =0v, v dout =0.1v 0.5 1 i ma -v det detector threshold v in =6v, v ce =6v, v out =v d 1.2v ? 0v v d 0.98 v d v d 1.02 jv tv det output delay time for released voltage v in =6v, v ce =6v, v out =0v ? v d 1.2v at 80% of rising 1.5 3.5 6.0 j ms v hys detector threshold hysteresis v in =6v, v ce =6v, v out =0v ? v d 1.2v v d 0.01 v d 0.03 v d 0.05 jmv d - v det / d t detector threshold temperature coefficient -40 c topt 85 c 100 ppm/ c note: refer to test circuits
12345 rev. 1.11 - 6 - n test circuits inductor l : 27 m h(sumida electronic, cd104) diode sd : rb491d (rohm, schottky type) capacitor cl: 47 m f(tantalum type) c in : 22 m f(tantalum type) power mos pmos : hat1020r(hitachi) resistor r : 100k w c) + -- + - a) 4 3 6 5 v oscilloscope sd l c l v in 1 pmos c in 2 + - + - f) 4 3 6 5 v oscilloscope sd l c l 1 pmos v in c in 2 a 3 4 6 5 1 v in 2 3 4 6 5 1 g) oscilloscope v in v out 2 e) a 3 4 6 5 1 v in 2 a 3 4 6 5 1 d) v ext v in v out 2 a 3 4 6 5 1 h) v in v out 2 a i) v dout 3 4 6 5 1 v in 2 3 4 6 5 1 oscilloscope j) v in v out 2 r + - b) a 3 4 6 5 1 c in 2 v in
12345 rev. 1.11 - 7 - n n n n typical applications and application hints vcc reset/ cpu ext v in v out gnd vd out ce sd1 l c out c in pmos r1 ce control pmos: hat1020r (hitachi), si3443dv (siliconix) l : cd105(sumida, 27 m h) sd1 : rb491d (rohm) c out : 47 m f(tantalum type) c in :10 m f(tantalum type) r1 : 100k w when you use these ics, consider the following issues; l as shown in the block diagram, a parasitic diode is formed in each terminal, each of these diodes is not formed for load current, therefore do not use it in such a way. when you control the ce pin by another power supply, do not make its "h" level more than the voltage level of v in pin. l detector threshold hysteresis is set at 3 percent of detector threshold voltage. (min. 1 percent, max. 5 percent) l setting detector threshold voltage range depends on output voltage of dc/dc converter. release voltage from reset condition must not be more than output voltage of dc/dc converter. (detector threshold voltage 1.07 < output voltage of dc/dc converter 0.98 l when the r1221nxxxx is on stand-by mode, the output voltage of vd out is gnd level, therefore if the pull-up resistor for vd out pin is pulled up another power supply, a certain amount of current is loading through the resistor. l the operation of latch-type protection circuit is as follows; when the maximum duty cycle continues longer than the delay time for protection circuit, (refer to the electrical characteristics) the protection circuit works to shut-down the external power mos with its latching operation. therefore when an input/output voltage difference is small, the protection circuit may work even at small load current. to release the protection state, after disable this ic with a chip enable circuit, enable it again, or restart this ic with power-on. however, in the case of restarting this ic with power-on, after the power supply is turned off, if a certain amount of charge remains in c in , or some voltage is forced to v in from c in , this ic might not be restarted even after power-on. if rising transition speed of supply voltage is too slow, or the time which is required for v in voltage to reach output voltage of dc/dc converter is longer than soft-starting time plus delay time for protection circuit, protection circuit works before v in voltage reaches output voltage of dc/dc converter. to avoid this condition, make this ic disable(ce=l) first, then force v in voltage, and after v in voltage becomes equal or more than v out , make this ic enable(ce=h). l set external components as close as possible to the ic and minimize the connection between the components and the ic. in particular, a capacitor should be connected to v out pin with the minimum connection. and make sufficient grounding and reinforce supplying. a large switching current flows through the connection of power supply, an inductor and the connection of v out. if the impedance of power supply line is high, the voltage level of power supply of the ic fluctuates with the switching current. this may cause unstable operation of the ic.
12345 rev. 1.11 - 8 - l use capacitors with a capacity of 22 m f or more for v out pin, and with good high frequency characteristics such as tantalum capacitors. we recommend you to use capacitors with an allowable voltage which is at least twice as much as setting output voltage. this is because there may be a case where a spike-shaped high voltage is generated by an inductor when an external transistor is on and off. l choose an inductor that has sufficiently small d.c. resistance and large allowable current and is hard to reach magnetic saturation. and if the value of inductance of an inductor is extremely small, the i lx may exceed the absolute maximum rating at the maximum loading. use an inductor with appropriate inductance. l use a diode of a schottky type with high switching speed, and also pay attention to its current capacity. l do not use this ic under the condition at v in voltage less than minimum operating voltage. p the performance of power source circuits using these ics extremely depends upon the peripheral circuits. pay attention in the selection of the peripheral circuits. in particular, design the peripheral circuits in a way that the values such as voltage, current, and power of each component, pcb patterns and the ic do not exceed their respected rated values. n operation of step-down dc/dc converter and output current the step-down dc/dc converter charges energy in the inductor when lx transistor is on, and discharges the energy from the inductor when lx transistor is off and controls with less energy loss, so that a lower output voltage than the input voltage is obtained. the operation will be explained with reference to the following diagrams : step 1 : lxtr turns on and current il(=i1) flows, and energy is charged into cl. at this moment, il increases from ilmin(=0) to reach ilmax in proportion to the on-time period(ton) of lxtr. step 2 : when lxtr turns off, schottky diode(sd) turns on in order that l maintains il at ilmax, and current il(=i2) flows. step 3 : il decreases gradually and reaches ilmin after a time period of topen, and sd turns off, provided that in the continuous mode, next cycle starts before il becomes to 0 because toff time is not enough. in this case, il value is from this ilmin(>0). in the case of pwm control system, the output voltage is maintained by controlling the on-time period(ton), sith the oscillator frequency(fosc) being maintained constant. l discontinuous conduction mode and continuous conduction mode the maximum value(ilmax) and the minimum value(ilmin) of the current which flows through the inductor are the same as those when lxtr is on and when it is off. the difference between ilmax and ilmin, which is represented by d i ; d i =ilmax Cilmin =v out topen/l=(v in -v out ) ton/l equation 1 wherein t=1/fosc=ton+toff duty(%)=ton/t 100=ton fosc 100 topen toff sd l cl v out i out v in lx tr i1 i2 t=1/fosc toff ton ilmax ilmin topen
12345 rev. 1.11 - 9 - in equation 1, v out topen/l and (v in -v out ) ton/l are respectively show the change of the current at on, and the change of the current at off. when the output current(iout) is relatively small, topen0). the former mode is referred to as the discontinuous mode and the latter mode is referred to as continuous mode. in the continuous mode, when equation 1 is solved for ton and assumed that the solution is tonc, tonc =t v in /v out equation 2 when ton 12345 rev. 1.11 - 10 - 3. capacitor as for c in , use a capacitor with low esr(equivalent series resistance) and a capacity of at least 10 m f for stable operation. c out can reduce ripple of output voltage, therefore 47 m f to 100 m f tantalum type is recommended. 4. lx transistor pch power mos fet is required for this ic. its breakdown voltage between gate and source should be a few volt higher than input voltage. in the case of input voltage is low, to turn on mos fet completely, select a mos fet with low threshold voltage. if a large load current is necessary for your application and important, choose a mos fet with low on resistance for good efficiency. if a small load current is mainly necessary for your application, choose a mos fet with low gate capacity for good efficiency. maximum continuous drain current of mos fet should be larger than peak current, ilmax.
12345 rev. 1.11 - 11 - n typical characteristcs 1) output voltage vs. output current 3.200 3.220 3.240 3.260 3.280 3.300 3.320 3.340 3.360 3.380 3.400 1e-05 0.0001 0.001 0.01 0.1 1 output current i out (a) output voltage v out (v) 12v 8v 4.5v r1221n33ah l=27uh 1.480 1.485 1.490 1.495 1.500 1.505 1.510 1.515 1.520 1e-05 0.0001 0.001 0.01 0.1 1 output current i out (a) output voltage v out (v) 13.2v 8v 5v 2.3v r1221n15xh l=27uh 2) efficiency vs. output current r1221n33aa (vin=4.5v) 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv r1221n33aa (vin=12v) 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv r1221n33ac (vin=4.5v) 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv r1221n33ab (vin=12v) 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv
12345 rev. 1.11 - 12 - r1221n33ac (vin=4.5v) 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv r1221n33ac (vin=12v) 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv r1221n50xa (vin=6.0v) 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv r1221n50xa (vin=12v) 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv r1221n50xb (vin=6.0v) 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv r1221n50xb (vin=12v) 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv
12345 rev. 1.11 - 13 - r1221n50xc (vin=6.0v) 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv r1221n50xc (vin=12v) 0 20 40 60 80 100 0.1 1 10 100 1000 output current i out (ma) efficiency (%) cd104-27uh si3443dv 3) ripple voltage vs. output current r1221n33aa 0 20 40 60 80 100 120 140 160 180 200 1 10 100 1000 output current i out (ma) ripple voltage vrpp(mv) vin4.5v vin8v vin12v l=27uh c=47uf(ta) r1221n50xa 0 20 40 60 80 100 120 140 160 180 200 1 10 100 1000 output current i out (ma) ripple voltage vrpp(mv) vin6v vin8v vin12v l=27uh c=47uf(ta) r1221n33ab 0 20 40 60 80 100 120 140 160 180 200 1 10 100 1000 output current i out (ma) ripple voltage vrpp(mv) vin4.5v vin8v vin12v l=27uh c=47uf(ta) r1221n50xb 0 20 40 60 80 100 120 140 160 180 200 1 10 100 1000 output current i out (ma) ripple voltage vrpp(mv) vin6v vin8v vin12v l=27uh c=47uf(ta)
12345 rev. 1.11 - 14 - r1221n33ac 0 20 40 60 80 100 120 140 160 180 200 1 10 100 1000 output current i out (ma) ripple voltage vrpp(mv) vin4.5v vin8v vin12v l=27uh c=47uf(ta) r1221n50xc 0 20 40 60 80 100 120 140 160 180 200 1 10 100 1000 output current i out (ma) ripple voltage vrpp(mv) vin6v vin8v vin12v l=27uh c=47uf(ta) 4) oscillator frequency vs. input voltage r1221n15xb 0 100 200 300 400 500 600 0 5 10 15 input voltage v in (v) oscillator frequency fosc(khz) l=27uh r1221n15xa 0 100 200 300 400 500 600 0 5 10 15 input voltage v in (v) oscillator frequency fosc(khz) l=27uh 5) output voltage vs. input voltage r1221n15xb 1.47 1.48 1.49 1.50 1.51 1.52 1.53 0 5 10 15 input voltage v in (v) output voltage vout(v) l=27uh r1221n15xa 1.47 1.48 1.49 1.50 1.51 1.52 1.53 0 5 10 15 input voltage v in (v) output voltage vout(v) l=27uh
12345 rev. 1.11 - 15 - r1221n33ab 3.24 3.26 3.28 3.30 3.32 3.34 3.36 0 5 10 15 input voltage v in (v) output voltage vout(v) l=27uh r1221n33aa 3.24 3.26 3.28 3.30 3.32 3.34 3.36 0 5 10 15 input voltage v in (v) output voltage vout(v) l=27uh 6) output voltage vs. temperature r1221n33ah 3.27 3.28 3.29 3.30 3.31 -50 0 50 100 temperature topt output voltage v out (v) l=27uh r1221n15xb 1.47 1.48 1.49 1.50 1.51 -50 0 50 100 temperature topt output voltage v out (v) l=27uh 7) detector threshold vs. temperature r1221n25xa (vd=2.0v) 1.97 1.98 1.99 2.00 2.01 -50 0 50 100 temperature topt detector threshold vd out (v) v in =6v r1221n15xb (vd=1.2v) 1.18 1.19 1.20 1.21 1.22 -50 0 50 100 temperature topt detector threshold vd out (v) v in =6v ( c) ( c) ( c) ( c)
12345 rev. 1.11 - 16 - r1221n33ab (vd=3.0v) 2.94 2.96 2.98 3.00 3.02 3.04 3.06 -50 0 50 100 temperature topt detector threshold vd out (v) v in =6v 8) oscillator frequency vs. temperature r1221n33ab 400 450 500 550 600 -50 0 50 100 temperature topt oscillator frequency fosc(khz) l=27uh v in =4.5v r1221n25xa 240 260 280 300 320 340 360 -50 0 50 100 temperature topt oscillator frequency fosc(khz) l=27uh v in =3.7v 9) supply current vs. temperature r1221n33ah 90 95 100 105 110 115 120 125 130 135 -50 0 50 100 temperature topt supply current1(ua) vin15v vin13.2v vin8v r1221n33ag 50 60 70 80 90 100 -50 0 50 100 temperature topt supply current1(ua) vin15v vin13.2v vin8v ( c) ( c) ( c) ( c) ( c)
12345 rev. 1.11 - 17 - 10) soft-start time vs. temperature r1221n33ab 0 2 4 6 8 10 -50 0 50 100 temperature topt soft-start time(msec) l=27uh v in =4.5v r1221n25xa 2 4 6 8 10 12 -50 0 50 100 temperature topt soft-start time (msec) l=27uh v in =3.7v 11) delay time for latch-type protection vs. temperature r1221n33ab 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 -50 0 50 100 temperature topt delay time for latch-type protection(msec) v in =4.5v r1221n25xa 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 -50 0 50 100 temperature topt delay time for latch-type protection(msec) v in =3.7v 12) delay time for reset-type protection vs. temperature r1221n33ah 0 1 2 3 4 5 -50 0 50 100 temperature topt delay time for reset-type protection(msec) v in =4.5v r1221n33ag 0 1 2 3 4 5 -50 0 50 100 temperature topt delay time for reset-type protection(msec) v in =4.5v ( c) ( c) ( c) ( c) ( c) ( c)
12345 rev. 1.11 - 18 - 13) vd output delay time vs. temperature r1221n33ab 0 1 2 3 4 5 6 -50 0 50 100 temperature topt vd output delay time (msec) v in =8.0v r1221n25xa 0 1 2 3 4 5 6 -50 0 50 100 temperature topt vd output delay time(msec) v in =8.0v 14) exth output current vs. temperature r1221n33ab 0 2 4 6 8 10 12 14 16 -50 0 50 100 temperature topt ext"h" output current(ma) 15) ext l output current vs. temperature r1221n33ab 0 5 10 15 20 25 30 -50 0 50 100 temperature topt ext"l"output current(ma) ( c) ( c) ( c) ( c)
12345 rev. 1.11 - 19 - 16) vd out l output current vs. temperature r1221n33ad 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 -50 0 50 100 temperature topt vdlc(ma) 17) load transient response r1221n33aa 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 0 0.0005 0.001 time (sec) output voltage v out (v) output current i out (ma) 500 0.1 v in =5v l=27uh r1221n33aa 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 0 0.05 0.1 time (sec) output voltage v out (v) output current i out (ma) 500 0.1 v in =5v l=27uh r1221n33ab 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 0 0.0005 0.001 time (sec) output voltage v out (v) output current i out (ma) 500 0.1 v in =5v l=27uh r1221n33ab 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 0 0.05 0.1 time (sec) output voltage v out (v) output current i out (ma) 500 0.1 v in =5v l=27uh ( c)
12345 rev. 1.11 - 20 - r1221n33ac 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 0 0.0005 0.001 time (sec) output voltage v out (v) i out (ma) 500 0.1 v in =5v l=27uh r1221n33ac 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 0 0.05 0.1 time (sec) output voltage v out (v) output current i out (ma) 500 0.1 v in =5v l=27uh r1221n33ad 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 0 0.0005 0.001 time (sec) output voltage v out (v) out ut cu e t i out (ma) 500 0.1 v in =5v l=27uh r1221n33ad 2.6 2.7 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 3.6 0 0.05 0.1 time (sec) output voltage v out (v) output current i out (ma) 500 0.1 v in =5v l=27uh 18) turn-on waveform r1221n33aa (v in =10v,i out =0ma) -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 -0.01 0 0.01 0.02 time (sec) output voltage v out (v) l=27uh 0 10 ce volta g e(v) r1221n33aa (v in =5v,i out =0ma) -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 -0.01 0 0.01 0.02 time (sec) output voltage v out (v) l=27uh 0 5 ce volta g e(v)
12345 rev. 1.11 - 21 - r1221n33ab (v in =10v,i out =0ma) -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 -0.01 0 0.01 0.02 time (sec) output voltage v out (v) l=27uh 0 10 ce voltage(v) r1221n33ab (v in =5v,i out =0ma) -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 -0.01 0 0.01 0.02 time (sec) output voltage v out (v) l=27uh 0 5 ce voltage(v ) r1221n33aa (v in =10v,i out =100ma) -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 -0.01 0 0.01 0.02 time (sec) output voltage v out (v) l=27uh 0 10 ce volta g e(v) r1221n33aa (v in =5v,i out =100ma) -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 -0.01 0 0.01 0.02 time (sec) output voltage v out (v) l=27uh 0 5 ce voltage(v) r1221n33ab (v in =10v,i out =100ma) -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 -0.01 0 0.01 0.02 time (sec) output voltage v out (v) l=27uh 0 10 ce voltage(v) r1221n33ab (v in =5v,i out =100ma) -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 -0.01 0 0.01 0.02 time (sec) output voltage v out (v) l=27uh 0 5 ce voltage(v)

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