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R5212D series step-down dc/dc converter with vr and reset no.ea-128-0510 1 outline the R5212D is cmos-based pwm step-down dc/dc converter combined with a voltage regulator (vr) and a voltage detector (vd), with low supply current. each of these ics consists of an oscillator, a pwm cont rol circuit, a voltage reference unit, an error amplifier, a soft-start circuit, a current limit circuit, a phase compensat ion circuit, a resistor net for voltage detect circuit, an output driver transistor, and so on. a low ripple, hi gh efficiency step-down dc/dc converter can be easily composed of this ic with some external co mponents, or an inductor, a diode, and capacitors. the oscillator frequency is 1.2mhz, therefore small induc tor and capacitor can be used with this ic. further, this ic equips the under voltage lockout function (uvlo) . if the input voltage becomes equal or less than 2.35v (typ.), the output of dc/dc converter turns off. howeve r, in the a/b version, embedded voltage regulator and detector continue to operate. in the c/d version, ld o output also turns off and only the voltage detector is working. the voltage regulator consists of a voltage reference unit, a resistor net for voltage detect circuit, an error amplifier, an output driver transistor, and so on. the input source voltage of the built-in voltage regulator is v in pin (a/b version) or v out1 pin, the output of dc/dc converter (c/d version). the built-in voltage detector supervises the input voltage and the output is n-channel open drain. power-on reset delay time is also included and interna lly set typically at 12ms (a/c version) or 50ms(b/d version). features ? range of input vo ltage ............................. 3. 0v~5.5v ? built-in soft-start function (typ. 1ms) and built-in power-on reset delay (typ. 12ms or 50ms) ? maximum output current........................... 500ma (dc/dc), 200ma (vr) ? accuracy output volt age .......................... 2.0% ( dc/dc and voltage regulator output) ? accuracy of volt age detector .................... 2.5% ? output voltage (vr)(a/b ve rsion) ............ stepwise setti ng with a step of 0.1v in the range of 2.0v to 3.6v (c/d version) ............ st epwise setting with a step of 0.1v in the range of 1.2v to 3.0v ? output voltage (dc/dc) (a/b version) ..... stepwise setting wi th a step of 0.1v in the range of 1.2v to 3.6v (c/d version) ..... stepwise setting with a step of 0.1v in the range of 2.5v to 3.6v ? output voltage (vd) .................................. stepwis e setting with a step of 0.1v in the range of 3.0v to 4.5v ? package .................................................... hson -6 (t = 0.9mm) applications ? power source for hand-held communication equipment, cd or dvd drives. ? power source for battery-powered equipment.
R5212D 2 block diagrams r5212xxxa/b 6 v in l x gnd v out1 1 4 3 v dout 5 v out2 2 current limit osc soft start u.v.l.o. delay circuit current limit vref vref vref output control logic R5212Dxxxc/d v in l x gnd v out1 5 v out2 v dout current limit & feedback osc vref u.v.l.o. vref vref current limit delay circuit 2 3 1 6 4 output control logic soft start
R5212D 3 selection guide in the R5212D series, the output voltage combination for the ics can be selected at the user?s re-quest. the selection can be made with designating the part number as shown below; R5212Dxxx x-tr part number a b c code contents a output voltage combination code number b designation of optional function a: vr input pin = v in pin, vd delay = 12ms b: vr input pin = v in pin, vd delay = 50ms c: vr input pin = dc/dc output, vd delay = typ. 12ms d: vr input pin = dc/dc output, vd delay = typ. 50ms c designation of taping type: re fer to taping specification.
R5212D 4 pin configuration hson-6 top view bottom view 654 123 45 6 32 1 pin descriptions pin no symbol pin description 1 l x switching pin (p-channel open-drain output type) 2 gnd ground pin 3 v dout output pin of voltage detector (n-channel open-drain out-put type) 4 v out1 dc/dc converter step-down output monitoring pin 5 v out2 output pin of voltage regulator 6 v in voltage supply pin ? tab in the parts have gnd level. (they are connected to the reverse side of this ic.) do not connect to other wires or land patterns. absolute maximum ratings (gnd = 0v) symbol item rating unit v in v in pin voltage 6.5 v v lx lx pin voltage ? 0.3 ~ v in + 0.3 v v out1 v out1 pin voltage ? 0.3 ~ v in + 0.3 v v out2 v out2 pin voltage ? 0.3 ~ v in + 0.3 v v dout v dout pin voltage ? 0.3 ~ 6.5 v i lx lx pin output current 800 ma i out2 v out2 pin output current 400 ma p d power dissipation (on board) ? 1 900 mw topt operating temperature range ? 40 ~ + 85 c tstg storage temperature range ? 55 ~ + 125 c ? 1 ) for power dissipation please refer to package information to be described.
R5212D 5 electrical characteristics ? R5212Dxxxa topt = 25 c symbol item conditions min. typ. max. unit v in operating input voltage 3.0 5.5 v i dd supply current v in = 5.0v, v out1 = 0v 400 800 a v uvlo2 uvlo release voltage 2.35 2.50 2.65 v v uvlohys uvlo detector threshold voltage hysteresis 0.05 0.15 0.25 v ? dc/dc part topt = 25 c symbol item conditions min. typ. max. unit v out1 dc/dc output voltage v in = 5.0v, at no load open loop v out1 0.98 v out1 1.02 v ? v out1 / ? topt dc/dc output voltage temperature coefficient 40 c < = < = c 100 ppm / c fosc oscillator frequency v in = 5.0v 960 1200 1440 khz r lx lx on resistance v in = 5.0v, i lx = 100ma 0.4 0.8 ? i lxleak lx leakage current v in = v out1 = 5.5v, v lx = 0v 0.01 5.00 a i lxlim lx current limit v in = 5.0v 600 800 ma maxduty maximum duty cycle 100 % tstart soft-start time v in = 5.0v 0.35 1.00 3.00 ms ? vr part topt = 25 c symbol item conditions min. typ. max. unit v out2 vr output voltage v in = 5.0v, i out2 = 10ma v out2 0.98 v out2 1.02 v i out2 maximum output current of vr v in = 5.0v 200 ma v reg2 vr load regulation v in ? v out2 = 0v 1ma < = < = = 100ma 0.2 0.3 v i lim2 short current limit v out2 = 0v 50 ma ? v out2 / ? topt vr output voltage temperature coefficient 40 c < = < = c 100 ppm / c ? vd part topt = 25 c symbol item conditions min. typ. max. unit ? v det vd detector threshold ? v det 0.975 ? v det 1.025 v ?? v det / ? topt vd detector threshold temperature coefficient 40 c < = < = c 100 ppm / c v hys hysteresis range ? v det 0.05 v t plh vd output delay time for release v in = v dout =? v det 0.9 to 5.0 3 12 30 ms i doutl v dout ?l? output current v in = 2.0v, i out = 0.1v 2 7 20 ma
R5212D 6 ? R5212Dxxxb topt = 25 c symbol item conditions min. typ. max. unit v in operating input voltage 3.0 5.5 v i dd supply current v in = 5.0v, v out1 = 0v 400 800 a v uvlo2 uvlo release voltage 2.35 2.50 2.65 v v uvlohys uvlo detector threshold voltage hysteresis 0.05 0.15 0.25 v ? dc/dc part topt = 25 c symbol item conditions min. typ. max. unit v out1 dc/dc output voltage v in = 5.0v, at no load open loop v out1 0.98 v out1 1.02 v ? v out1 / ? topt dc/dc output voltage temperature coefficient 40 c < = < = c 100 ppm / c fosc oscillator frequency v in = 5.0v 960 1200 1440 khz r lx lx on resistance v in = 5.0v, i lx = 100ma 0.4 0.8 ? i lxleak lx leakage current v in = v out1 = 5.5v, v lx = 0v 0.01 5.00 a i lxlim lx current limit v in = 5.0v 600 850 ma maxduty maximum duty cycle 100 % tstart soft-start time v in = 5.0v 0.35 1.00 3.00 ms ? vr part topt = 25 c symbol item conditions min. typ. max. unit v out2 vr output voltage v in = 5.0v, i out2 = 10ma v out2 0.98 v out2 1.02 v i out2 maximum output current of vr v in = 5.0v 200 ma v reg2 vr load regulation v in ? v out2 = 0v 1ma < = < = = 100ma 0.2 0.3 v i lim2 short current limit v out2 = 0v 50 ma ? v out2 / ? topt vr output voltage temperature coefficient 40 c < = < = c 100 ppm / c ? vd part topt = 25 c symbol item conditions min. typ. max. unit ? v det vd detector threshold ? v det 0.975 ? v det 1.025 v ?? v det / ? topt vd detector threshold temperature coefficient 40 c < = < = c 100 ppm / c v hys hysteresis range ? v det 0.05 v t plh vd output delay time for release v in = v dout =? v det 0.9 to 5.0 3 12 30 ms i doutl v dout ?l? output current v in = 2.0v, v dout = 0.1v 2 7 20 ma
R5212D 7 ? R5212Dxxxc topt = 25 c symbol item conditions min. typ. max. unit v in operating input voltage 3.0 5.5 v i dd supply current v in = 5.0v, v out1 = 0v 400 800 a v uvlo2 uvlo release voltage 2.35 2.50 2.65 v v uvlohys uvlo detector threshold voltage hysteresis 0.05 0.15 0.25 v ? dc/dc part topt = 25 c symbol item conditions min. typ. max. unit v out1 dc/dc output voltage v in = 5.0v, at no load open loop v out1 0.98 v out1 1.02 v ? v out1 / ? topt dc/dc output voltage temperature coefficient 40 c < = < = c 100 ppm / c fosc oscillator frequency v in = 5.0v 960 1200 1440 khz r lx lx on resistance v in = 5.0v, i lx = 100ma 0.4 0.8 ? i lxleak lx leakage current v in = v out1 = 5.5v, v lx = 0v 0.01 5.00 a i lxlim lx current limit v in = 5.0v 600 850 ma maxduty maximum duty cycle 100 % tstart soft-start time v in = 5.0v 0.35 1.00 3.00 ms ? vr part topt = 25 c symbol item conditions min. typ. max. unit v out2 vr output voltage v out1 = 3.3v i out2 = 10ma v out2 0.98 v out2 1.02 v i out2 maximum output current of vr v in = 5.0v 200 ma v reg2 vr load regulation v in ? v out2 = 0v 1ma < = < = = 100ma 0.2 0.3 v i lim2 short current limit v out2 = 0v 50 ma ? v out2 / ? topt vr output voltage temperature coefficient 40 c < = < = c 100 ppm / c ? vd part topt = 25 c symbol item conditions min. typ. max. unit ? v det vd detector threshold ? v det 0.975 ? v det 1.025 v ?? v det / ? topt vd detector threshold temperature coefficient 40 c < = < = c 100 ppm / c v hys hysteresis range ? v det 0.05 v t plh vd output delay time for release v in = v dout =? v det 0.9 to 5.0 3 12 30 ms i doutl v dout ?l? output current v in = 2.0v, v dout = 0.1v 2 7 20 ma
R5212D 8 ? R5212Dxxxd topt = 25 c symbol item conditions min. typ. max. unit v in operating input voltage 3.0 5.5 v i dd supply current v in = 5.0v, v out1 = 0v 400 800 a v uvlo2 uvlo release voltage 2.35 2.50 2.65 v v uvlohys uvlo detector threshold voltage hysteresis 0.05 0.15 0.25 v ? dc/dc part topt = 25 c symbol item conditions min. typ. max. unit v out1 dc/dc output voltage v in = 5.0v, at no load open loop v out1 0.98 v out1 1.02 v ? v out1 / ? topt dc/dc output voltage temperature coefficient 40 c < = < = c 100 ppm / c fosc oscillator frequency v in = 5.0v 960 1200 1440 khz r lx lx on resistance v in = 5.0v, i lx = 100ma 0.4 0.8 ? i lxleak lx leakage current v in = v out1 = 5.5v, v lx = 0v 0.01 5.00 a i lxlim lx current limit v in = 5.0v 600 850 ma maxduty maximum duty cycle 100 % tstart soft-start time v in = 5.0v 0.35 1.00 3.00 ms ? vr part topt = 25 c symbol item conditions min. typ. max. unit v out2 vr output voltage v out1 = 3.3v i out2 = 10ma v out2 0.98 v out2 1.02 v i out2 maximum output current of vr v in = 5.0v, v out1 = 3.3v 200 ma v reg2 vr load regulation v in ? v out2 = 0v 1ma < = < = = 100ma 0.2 0.3 v i lim2 short current limit v out2 = 0v 50 ma ? v out2 / ? topt vr output voltage temperature coefficient 40 c < = < = c 100 ppm / c ? vd part topt = 25 c symbol item conditions min. typ. max. unit ? v det vd detector threshold ? v det 0.975 ? v det 1.025 v ?? v det / ? topt vd detector threshold temperature coefficient 40 c < = < = c 100 ppm / c v hys hysteresis range ? v det 0.05 v t plh vd output delay time for release v in = v dout =? v det 0.9 to 5.0 10 50 120 ms i doutl v dout ?l? output current v in = 2.0v, v dout = 0.1v 2 7 20 ma
R5212D 9 typical application and application hints R5212Dxxxx v out2 v dout v out1 v in gnd l x v out2 v dout v out1 d 1 l 1 c 2 c 1 r 1 c 3 examples of components symbol item (v out1 < = 1.6v) 4.7 h lqh43c series murata 4.7 h vlp5610 series tdk (v out1 > 1.6v) 6.8 h lqh43c series murata l 1 6.8 h vlp5610 series tdk d 1 rb491d(rohm) or ep05q03 (nihon inter) r 1 50k ? c 1 10 f ceramic capacitor c 2 10 f ceramic capacitor c 3 2.2 f ceramic capacitor
R5212D 10 when you use these ics, cons ider the following issues; 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 between v in and gnd with the minimum connection. make sufficient grounding, and reinforce supplying. a lar ge switching current may flow through the connection of power supply, an inductor and the connection of v out1 . if the impedance of the connection of power supply or ground is high, the voltage level of power supply of the ic fluctuates with the switching current. this may cause unstable operation of the ic. use a capacitor with a capacity of 10 f or more for v in and gnd, and with low esr ce ramic type. in terms of v out1 , use a ceramic capacitor with a capacity of 10 f or more. for v out2 pin, use a ceramic capacitor with a capacitance of 2.2 f or around. choose an inductor that has a small d.c. resistance and large allowable current and which is hard to reach magnetic saturation. if the value of inductance of an inductor is extremely small, the il x , which flows through lx transistor and an inductor, may exceed the absol ute maximum rating at the maximum loading. use an inductor with appropriate inductance. use a diode of a schottky type with high switching speed, and also pay attention to its current capacity. if the spike noise of lx pin is too large, make snub ci rcuit (such as serial connection of cr) between lx and gnd, then the noise will be reduced. the time constant of the cr depends on the actu al pcb, so evaluate it on the actual pcb. if the load current of the voltage regulat or is small, because of the switch ing noise of dc/dc converter, the output voltage of v out2 may be large. to avoid this, use the voltage r egulator with a load current at least 0.5ma. in terms of ldo, the difference between the set out put voltage and input voltage should be 0.5v or more, the performance of power source circuits using t hese 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 eac h component, pcb patterns and the ic do not exceed their respected rated values.
R5212D 11 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 transi stor 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: v in lx tr sd v out i out i2 l cl i1 ilmax il ilxmin topen ton t=1/fosc toff step 1 : lx tr. 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 l x tr. step 2 : when lx tr. turns off, schottky diode (sd) turn s 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 becom es 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), with the oscillator frequency (fosc) being maintained constant.
R5212D 12 ? discontinuous conduction mode and continuous conduction mode the maximum value (ilmax) and the minimum value (ilmin ) current which flow through the inductor is the same as those when lx tr. turns on and when it turns off. the difference between ilmax and il min, which is represented by ? i; ? i = ilmax ? ilmin = v out topen/l = (v in ? v out ) ton/l ........................................................e quation 1 where, t = 1/fosc = ton + toff duty (%) = ton/t 100 = ton fosc 100 topen < = toff in equation a, v out topen/l and (v in ? v out ) ton/l are respectively shown t he change of the current at on, and the change of the current at off. when the output current (i out ) is relatively small, topen < toff as illu strated in the above diagram. in this case, the energy is charged in the inductor during the time peri od of ton and is discharged in its entirely during the time period of toff, therefore ilmin becomes to zero (ilmin = 0). when i out is gradually increased, eventually, topen becomes to toff (topen = toff), and when i out is further increased, ilmin becomes larger than zero (ilmin>0). 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 out /v in .............................................................................................................equat ion 2 when ton R5212D 13 timing chart ? R5212Dxxxa/b (-v det +v hys ) -v det v uvlo2 v uvlo1 v in voltage v out1 voltage v dout voltage v out2 voltage l x voltage soft-start time vd delay for release vd delay for release
R5212D 14 ? R5212Dxxxc/d v in voltage v uvlo2 v out1 voltage soft-start time vd delay for release v dout voltage v uvlo1 -v det (-v det +v hys ) vd delay for release l x voltage v out2 voltage the timing chart which is shown in the previous page describes the relation of supply voltage changes with time and each output of dc/dc converter, voltage detector, and voltage regulator. (1) dc/dc converter when the power turns on and in the case of rising the v in voltage, while the v in voltage is at uvlo release level (v uvlo2 ) or less, the operation of the dc/dc converter stops and does not make switching, therefore v out1 voltage does not rise. when the v in voltage becomes uvlo release level or more, the dc/dc converter starts soft-start operation, and start switching, then v out1 will rise. after the soft-start time, if v in voltage becomes set v out1 level or more, v out1 will be settled at v out1 set output voltage. if v in voltage becomes uvlo detector threshold level (v uvlo1 ) or less, the dc/dc converter stop s switching then lx transistor in the ic turns off. (2) voltage detector if the v in voltage is at vd detector threshold level or less, the n-channel transistor of v dout pin turns on and outputs ?l? to v dout pin. then, when the v in voltage becomes vd detector threshold level + its hysteresis range ( ? v det + v hys ) or more, after vd delay for release (t plh ) passing, the n-channel transistor inside the ic turns off, v dout pin voltage reaches to the pull-up voltage. besides, the release circuit for vd starts from when v in voltage reaches ( ? v det + v hys ).
R5212D 15 (3)voltage regulator ? R5212Dxxxa/b the voltage regulator always operates even if uvlo function would work. therefore, v out2 voltage is nearly equal to v in voltage. actual value depends on the load current. when the v in voltage becomes set v out2 voltage or more, v out2 voltage will be the set output voltage. the short cu rrent limit can operate after soft-start time. ? R5212Dxxxc/d v out1 voltage is the input voltage for the built-in ldo, when the v out1 voltage is equal or less than v out2 set voltage, v out2 voltage is depending on the load current for v out2 , however almost same as v out1 voltage. when the v out1 voltage is equal or more than set v out2 voltage, v out2 voltage becomes the set output voltage. short current limit works after soft-start operation. test circuits v in v out1 gnd a v in l x v out1 gnd oscilloscope supply current uvlo detector threshold/ released voltage v in l x v out1 gnd a v in l x v out1 gnd v lx leakage current lx on resistance v in l x v out1 gnd oscilloscope v in l x v out1 gnd oscilloscope v out2 lx current limit v out1 output voltage
R5212D 16 v in l x v out1 v out1 gnd oscilloscope oscilloscope oscillator frequency, soft-start time v in l x v out1 i out2 gnd v out2 v v in l x v out1 gnd oscilloscope v dout v out2 output voltage, load regulation, dropout v dout detector threshold, hysteresis range, voltage, current limit, short current limit vd output delay time for release v in v out1 gnd vd out a v dout ?l? output current
R5212D 17 typical characteristics 1) dc/dc output voltage vs. output current (topt = 25 c) R5212D011a R5212D014c 0 200 400 300 500 100 output current i out1 (ma) dc/dc output voltage v out1 (v) 1.58 1.59 1.63 1.62 1.61 1.60 v in =4.0v v in =5.0v v in =5.5v 0 200 400 300 500 100 output current i out1 (ma) dc/dc output voltage v out1 (v) 3.24 3.28 3.26 3.36 3.34 3.32 3.30 v in =4.0v v in =5.0v v in =5.5v 2) efficiency vs. output current (topt = 25 c) r5211d011a r5211d014c 0.1 10 100 1000 1 output current i out1 (ma) efficiency ( % ) 0 60 50 40 30 20 10 90 80 70 v in =4.0v v in =5.0v v in =5.5v v out1 =1.6v 0.1 10 100 1000 1 output current i out1 (ma) efficiency ( % ) 0 60 50 40 30 20 10 100 90 80 70 v in =4.0v v in =5.0v v in =5.5v v out1 =3.3v 3) vr output voltage vs. output current (topt = 25 c) R5212D011a R5212D011a 0 100 150 200 50 output current i out2 (ma) vr output voltage v out2 (v) 2.55 2.61 2.59 2.57 2.65 2.63 v in =5v 0 200 400 300 500 100 output current i out2 (ma) vr output voltage v out2 (v) 0 2.0 1.5 1.0 0.5 3.0 2.5 v in =5v
R5212D 18 R5212D011a 0 200 400 300 500 100 output current i out2 (ma) vr output voltage v out2 (v) 0 2.0 1.5 1.0 0.5 3.0 2.5 v in =5v -40 c 25 c 85 c 4) dc/dc output voltage vs. temperature 5) vr output voltage vs. temperature R5212D011a R5212D011a -50 50 100 0 temperature topt( c) dc/dc output voltage v out1 (v) 1.50 1.60 1.55 1.70 1.65 v in =5v openloop -50 50 100 0 temperature topt( c) vr output voltage v out 2 (v) 2.50 v in =5v i out2 =10ma 2.55 2.60 2.65 2.70 6) vd detector threshold vs. temperature 7) vd released delay time vs. temperature R5212D011a R5212D -50 50 100 0 temperature topt( c) vd detector threshold - v det (v) 4.00 4.30 4.25 4.20 4.15 4.10 4.05 4.40 4.35 v in =5v -50 50 100 0 temperature topt( c) vd released delay timet plh (ms) 0 5 10 15 20 30 25 50 45 40 35 a/c version b/d version
R5212D 19 8) soft-start time vs. temperature 9)frequency vs. temperature R5212D011a R5212D011a -50 50 100 0 temperature topt( c) soft-start time tstart(ms) 0.0 1.0 0.5 2.0 1.5 v in =5v -50 50 100 0 temperature topt( c) frequency f osc (khz) 1050 1250 1200 1150 1100 1350 1300 v in =5v 10) supply current vs. temperature 11) on resistance vs. temperature R5212D011a R5212D011a -50 50 100 0 temperature topt( c) supply current i dd ( a) 300 360 340 320 400 380 v in =5v -50 50 100 0 temperature topt( c) on resistance r lx ( ? ) 0.0 0.6 0.4 0.2 1.0 0.8 v in =5v 12) uvlo released voltage vs. temperature 13) lx current limit vs. temperature R5212D011a R5212D011a -50 50 100 0 temperature topt( c) uvlo released voltage v uvlo2 (v) 2.30 2.60 2.50 2.40 2.70 -50 50 100 0 temperature topt( c) l x current limit i lxlim (ma) 500 800 700 600 1000 900 v in =5v
R5212D 20 14) soft-start output waveform (topt = 25 c) R5212D011a -0.5 0.5 1.5 12 0 time (ms) dc/dc,vr output voltage v out1 , v out2 (v) 0 6 4 2 10 8 2 0 6 4 v in =5v input voltage v in (v) v out1 v out2 v in 15) vd released delay waveform (topt = 25 c) R5212D011a -10 -5 5 25 20 15 10 30 0 time (ms) v d out detector output voltage v d out (v) 0 10 5 15 5 0 10 input voltage v in (v) v dout v in 16) dc/dc load transient response 1 (topt = 25 c) R5212D011a -20 80 60 40 20 100 0 time ( s) dc/dc output voltage v out1 (v) 1.2 1.6 1.5 1.4 1.3 1.7 0 800 600 400 200 1000 dc/dc output current i out1 (ma) l=4.7 h, c1=c2=10 f, v in =5v v out1 i out1 :10ma 200ma
R5212D 21 R5212D014c -20 80 60 40 20 100 0 time ( s) dc/dc output voltage v out1 (v) 2.9 3.3 3.2 3.1 3.0 3.4 0 800 600 400 200 1000 dc/dc output current i out1 (ma) l=10 h, c1=c2=10 f, v in =5v v out1 i out1 :10ma 200ma R5212D011a -100 300 400 200 100 0 time ( s) dc/dc output voltage v out1 (v) 1.3 1.7 1.6 1.5 1.4 1.8 0 800 600 400 200 1000 dc/dc output current i out1 (ma) l=4.7 h, c1=c2=10 f, v in =5v v out1 i out1 :200ma 10ma R5212D014c -100 400 600 700 300 200 100 800 0 time ( s) dc/dc output voltage v out1 (v) 3.0 3.4 3.3 3.2 3.1 3.5 0 800 600 400 200 1000 dc/dc output current i out1 (ma) l=10 h, c1=c2=10 f v in =5v v out1 i out1 :200ma 10ma
R5212D 22 17) vr load transient response (topt = 25 c) R5212D011a -4 468 2 010 -2 time ( s) vr output voltage v out2 (v) 2.54 2.61 2.59 2.57 2.55 2.63 2.60 2.58 2.56 2.62 0 700 800 500 600 400 300 200 100 900 vr output current i out2 (ma) c1=c2=10 f, c3=2.2 f v in =5v i out2 :10ma 150ma 18) dc/dc, vr ripple waveform (c = 10 f, v in = 5v, i out1 = 280ma, i out2 = 150ma, topt = 25 c ) R5212D011a -0.5 1 1.5 0.5 02 time ( s) dc/dc ripple waveform v out1 (mv) -100 10 -20 -30 -40 -50 -60 -70 -80 -90 30 -10 0 20 -30 80 50 40 30 20 10 0 -10 -20 100 60 70 90 vr ripple waveform v out2 (mv) l=4.7 h, v out1 =1.6v, v out2 =2.6v vr dc/dc R5212D014c -0.5 1 1.5 0.5 02 time ( s) dc/dc ripple waveform v out1 (mv) -100 30 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 50 10 20 40 -50 80 50 40 30 20 10 0 -10 -40 -30 -20 100 60 70 90 vr ripple waveform v out2 (mv) l=10 h, v out1 =3.3v, v out2 =2.5v vr dc/dc
R5212D 23 19) dc/dc output voltage vs. input voltage (topt = 25 c) R5212D011a R5212D014c 3 3.5 4.5 5 4 5.5 input voltage v in (v) output voltage v out1 (v) 1.58 1.59 1.60 1.61 1.62 i out1 =10ma 3.5 4.5 5 4 5.5 input voltage v in (v) output voltage v out1 (v) 3.27 3.28 3.29 3.30 3.31 i out1 =10ma 20) vr output voltage vs. input voltage (topt = 25 c) R5212D011a 3 4.5 5 4 3.5 5.5 input voltage v in (v) output voltage v out2 (v) 2.55 2.65 2.63 2.61 2.59 2.57 i out2 =10ma
package information pe-hson-6-0510 ? hson-6 unit: mm package dimensions 3.0 0.2 0.9max. 2.8 0.2 0.3 0.1 2.9 0.2 0.15 0.05 6 4 1 3 0.1 0.1 0.95 m 0.5typ (1.5) (0.15) (0.2) (0.2) (1.6) (0.65) attention: tabs or tab suspension leads in the parts have v dd or gnd level.(they are connected to the reverse side of this ic.) refer to pin descriptions. do not connect to other wires or land patterns. bottom view taping specification 2.0max. 0.2 0.1 4.0 0.1 2.0 0.05 4.0 0.1 3.3 3.2 8.0 0.3 1.75 0.1 3.5 0.05 ? 1.5 +0.1 0 ? 1.1 0.1 tr user direction of feed taping reel dimensions (1reel=3000pcs) 11.4 1.0 9.0 0.3 21 0.8 2 0.5 13 0.2 180 60 0 ? 1.5 +1 0
package information pe-hson-6-0510 power dissipation (hson-6) this specification is at mounted on board. power dissipation (p d ) depends on conditions of mounting on board. this specification is based on the measurement at the condition below: measurement conditions standard land pattern environment mounting on board (wind velocity=0m/s) board material glass cloth epoxy plactic (double sided) board dimensions 40mm 40mm 1.6mm copper ratio top side : approx. 50% , back side : approx. 50% through-hole 0.5mm 44pcs measurement result (topt=25 c,tjmax=125 c) standard land pattern free air power dissipation 900mw 400mw thermal resistance ja = (125 ? 25 c)/0.9w = 111 c/w 250 c/w 0 50 100 25 75 85 125 150 ambient temperature ( c) 0 500 300 700 900 1100 400 200 100 600 800 1000 1200 power dissipation p d (mw) on board free air 40 40 power dissipation measurement board pattern ic mount area unit : mm recommended land pattern 0.95 0.65 1.15 1.7 0.35 1.6 (unit: mm)
mark information me-R5212D-0510 R5212D series mark specification ? hson-6 1 2 3 4 5 6 1 to 4 : product code (refer to pa rt number vs. product code) 5 , 6 : lot number ? part number vs. product code product code part number 1 2 3 4 R5212D011a d 1 1 a R5212D014c d 1 4 c R5212D017a d 1 7 a R5212D016b d 1 6 b

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