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r1232d series pwm step-down dc/dc converter with synchronous rectifier no.ea-129-0606 1 outline the r1232d series are cmos-based pwm step-down dc /dc converters with synchronous rectifier, low supply current. as an output capacitor, a 10 f or more ceramic capacitor can be used with the r1232d. each of these ics consists of an oscillator, a pwm cont rol circuit, a voltage reference unit, an error amplifier, a soft-start circuit, protection circuits, a protection agai nst miss operation under low voltage (uvlo), a chip enable circuit, a synchronous rectifier, nch. driver transistor, and so on. a low ri pple, high efficiency step-down dc/dc converter can be easily composed of this ic with only a few kinds of external components, or an inductor and capacitors. (as for r1232d001x type, divider resistors are also necessary.) in terms of the output voltage, it is fixed internally in the r1232dxx1x types. while in the r1232d001x types, the output voltage is adjustable with external divider resistors. as protection circuits, current limit circuit which limits peak current of l x at each clock cycle, and latch type protection circuit exist. the latch protec tion works if the term of the over-current condition keeps on a certain time. latch-type protection circuit works to latch an internal driv er 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 or make the supply voltage at uvlo detector threshold level or lower than uvlo. features ? two choices of oscillator frequency ............................ 1mhz, 2.25mhz (small inductors can be used. 4.7 h for 1mhz/2.2 h for 2.25mhz) ? built-in driver on resi stance ....................................... p-channel 0.2 ? (at v in = 5.0v) ? built-in soft-start func tion............................................. typ. 1.0ms (fosc = 1mhz type) ? output voltage .............................................................. 0.9v to 3.3v (xx1x type) 0.8v to v in (001x type) ? high accuracy ou tput voltage ...................................... 2.0% ? built-in current limit circuit .......................................... typ. 1.4a ? package ........................................................................ son-8 (t = 0.9mm) applications ? power source for portable equipment such as pda, dsc, notebook pc. ? power source for hdd
r1232d 2 block diagrams r1232dxx1a/b 2 v in l x pgnd v out ce output contorol 3 current limit 1 qr s oscillator test circuit test ?l? or gnd fixed 6 slope compensation phase compensation 5 soft start uvlo 4 ?h? active v dd 7 a gnd error a mplifer pw m comparator 8 vref chip enable r1232d001c/d 2 v in l x pgnd v fb ce output contorol 3 current limit 1 qr s oscillator test circuit test ?l? or gnd fixed 6 slope compensation phase compensation 5 soft start uvlo chip enable 4 ?h? active v dd 7 a gnd error a mplifer pw m comparator 8 vref
r1232d 3 selection guide in the r1232d series, the output voltage, the osc illator frequency, and the taping 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; r1232dxx 1x-xx -x part number a b c d e code contents a setting output voltage(v out ): stepwise setting with a step of 0.1v in the range of 0.9v to 3.3v is possible for fixed output version."00" is for output voltage adjustable version (0.8v as the feedback voltage.) b 1: fixed c designation of optional function a: 1mhz, fixed output voltage b: 2.25mhz, fixed output voltage c: 1mhz, adjustable output voltage d: 2.25mhz, adjustable output voltage d designation of taping type; (refer to taping specification)"tr" is prescribed as a standard. e designation of composition of pin plating -f : lead free plating
r1232d 4 pin configuration son-8 8 7 6 5 1 2 3 4 5678 4321 ? ? ? bottom view top view pin descriptions pin no symbol pin description 1 pgnd ground pin 2 v in voltage supply pin 3 v dd voltage supply pin 4 ce chip enable pin (active with "h") 5 v out /v fb output/feedback pin 6 test test pin (forced to the "l" or gnd level.) 7 agnd ground pin 8 l x l x switching pin (cmos output) ? 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 symbol item rating unit v in v in supply voltage 6.5 v v dd v dd pin voltage 6.5 v v lx l x pin voltage ? 0.3 to v in + 0.3 v v ce ce pin input voltage ? 0.3 to v in + 0.3 v v test test pin input voltage ? 0.3 to v in + 0.3 v v fb v fb pin input voltage ? 0.3 to v in + 0.3 v i lx l x pin output current 1.5 v p d power dissipation (son-8)* 1 480 mw topt operating temperature range ? 40 to 85 c tstg storage temperature range ? 55 to 125 c ? 1) for the power dissipation, refer to the package information on the website.
r1232d 5 electrical characteristics ? r1232dxxxa/c topt = 25 c symbol item conditions min. typ. max. unit v in operating input voltage 2.6 5.5 v v out step-down output voltage v in = v ce = 5.0v, i out = 10ma 0.980 1.020 v v fb feedback voltage v in = v ce = 5.0v, i out = 10ma 0.784 0.800 0.816 v ? v out / ? topt step-down output voltage temperature coefficient ? 40c < = < = 150 ppm/ c fosc oscillator frequency v in = v ce = v set +1.5v 0.75 1.00 1.25 mhz i dd supply current v in = v ce = 5.5v, v out = 5.5v 70 140 190 a istandby standby current v ce = v out = 0v, v in = 5.5v 0.0 5.0 a i lxleak l x leakage current v in = 5.5v,v ce = 0v v lx = 0v/5.5v ? 5.0 0.0 5.0 a r onp on resistance of pch transistor v in = 5.0v, i lx = 200ma 0.20 0.35 ? r onn on resistance of nch transistor v in = 5.0v, i lx = 200ma 0.20 0.35 ? maxduty oscillator maximum duty cycle 100 % tstart soft-start time v in = v ce = 5.0v, at no load 0.5 1.0 1.4 ms tprot protection delay time v in = v ce = 5.0v 0.1 2.0 10.0 ms i lx limit lx current limit v in = v ce = 5.0v 1.0 1.4 a v uvlo1 uvlo detector threshold v in = v ce =2.6 v-> 1.5v 2.10 2.25 2.40 v v uvlo2 uvlo released voltage v in = v ce = 1.5v-> 2.6v 2.20 v uvlo1 + 0.10 2.50 v i ce ce input current v in = 5.5v, v ce = 5.5v/0v ? 0.1 0.0 0.1 a i vout v out leakage current v in = 5.5v, v ce =0v, v out = 5.5v/0v ? 0.1 0.0 0.1 a v ceh ce "h" input voltage v in = 5.5v 1.5 v v cel ce "l" input voltage v in = 3.0v 0.3 v v testl test pin "l" input voltage v in = 3.0v 0.3 v
r1232d 6 ? r1232dxxxb/d topt = 25 c symbol item conditions min. typ. max. unit v in operating input voltage 2.6 5.5 v v out step-down output voltage v in = v ce = 5.0v,i out = 10ma 0.980 1.020 v v fb feedback voltage v in = v ce = 5.0v,i out = 10ma 0.784 0.800 0.816 v ? v out / ? topt step-down output voltage temperature coefficient ? 40c < = < = 150 ppm/ c fosc oscillator frequency v in = v ce = v set +1.5v 1.91 2.25 2.58 mhz i dd supply current v in = v ce = 5.5v, v out = 5.5v 170 240 310 a istandby standby current v ce = v out = 0v, v in = 5.5v 0.0 5.0 a i lxleak l x leakage current v in = 5.5v, v ce = 0v, v lx = 0v/5.5v ? 5.0 0.0 5.0 a r onp on resistance of pch transistor v in = 5.0v, i lx = 200ma 0.20 0.35 ? r onn on resistance of nch transistor v in = 5.0v, i lx = 200ma 0.20 0.35 ? maxduty oscillator maximum duty cycle 100 % tstart soft-start time v in = v ce = 5.0v, at no load 0.15 0.4 0.7 ms tprot protection delay time v in = v ce = 5.0v 0.1 2.0 10.0 ms i lx limit l x current limit v in = v ce = 5.0v 1.0 1.4 a v uvlo1 uvlo detector threshold v in = v ce = 2.6v -> 1.5v 2.10 2.25 2.40 v v uvlo2 uvlo released voltage v in = v ce = 1.5v -> 2.6v 2.20 v uvlo1 + 0.10 2.50 v i ce ce input current v in = 5.5v, v ce = 5.5v/0v ? 0.1 0.0 0.1 a i vout v out leakage current v in = 5.5v, v ce = 0v, v out = 5.5v/0v ? 0.1 0.0 0.1 a v ceh ce "h" input voltage v in = 5.5v 1.5 v v cel ce "l" input voltage v in = 3.0v 0.3 v v testl test "l" input voltage v in = 3.0v 0.3 v
r1232d 7 test circuit pgnd v in v dd ce v fb test agnd l x a test circuit for input current and leakage current pgnd v in v dd ce v fb test agnd l x a pgnd v in v dd ce v fb test agnd l x v test circuit for supply current and standby current test circuit for on resistance of l x pgnd v in v dd ce v fb test agnd l x oscilloscope input voltage, output voltage, frequency, lx current limit, protection delay time, uvlo voltage test circuit pgnd v in v dd ce v fb test agnd l x oscilloscope soft start time test circuit the bypass capacitor between power supply and gnd is a ceramic capacitor 10 f.
r1232d 8 typical application and technical notes ? fixed output voltage type pgnd v in v dd ce v fb test agnd l x l v out c in c out load ? adjustable output type pgnd v in v dd ce v fb test agnd l x l v out c in c out cb r1 r2 load c in 10 f c2012jb0j106mt (tdk), 10 f cm21b106m06ab (kyocera) c out 10 f c2012jb0j106mt (tdk), 10 f cm21b106m06ab (kyocera) l 4.7 h/2.7 h vlp5610-4r7mr90, vlp5610-2r7m1r0 (tdk) *2.2 h is also suitable for b version. in terms of setting r1, r2, cb, refer to the technical notes.
r1232d 9 when you use these ics, consider the following issues; ? input the same voltage into power supply pins, v in and v dd . set the same level as agnd and pgnd. ? when you control the ce pin by anot her power supply, do not make its "h" level more than the voltage level of v in / v dd pin. ? set external components such as an inductor, c in , c out as close as possible to the ic, in particular, minimize the wiring to v in pin and pgnd pin. ? at stand by mode, (ce = "l"), the l x output is hi-z, or both p-channel transistor and n-channel transistor of l x pin turn off. ? in terms of the protection circui ts, current limit for the peak current of each cycle of lx, and the latch protection circuit, which works if the over-limit current flows continuously for a certain time exist. to release the protection, once make this ic into be standby mode with chip enable pin, or make the supply voltage be down to uvlo threshold level or less. ? reinforce the v in , pgnd, and v out lines sufficiently. large switching current may flow in these lines. if the impedance of v in and pgnd lines is too large, the internal volt age level in this ic may shift caused by the switching current, and the operation might be unstable. ? connect the test pin to the "l" or gnd level. 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 eac h component, pcb patterns and the ic do not exceed their respected rated values.
r1232d 10 operation of step-down dc/dc converter and output current the step-down dc/dc converter charges energy in the inductor when l x transistor is on, and discharges the energy from the inductor when l x 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: i out lx t r l sd v in i1 v out cl i2 step 1: p-channel tr. turns on and current il ( = i1) flows, and energy is charged into c l . at this moment, il increases from ilmin ( = 0) to reach ilmax in proportion to the on-time period (ton) of p-channel tr. step 2: when p-channel tr. turns off, synchronous rectifier n- channel tr. turns on in order that l maintains il at ilmax, and current il ( = i2) flows. step 3: il ( = i2) decreases gradually and reaches il = ilmin = 0 after a time period of topen, and n-channel tr. turns off. provided that in the continuous mode, nex t cycle starts before il becomes to 0 because toff time is not enough. in this case, il value increases 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 (f osc) being maintained constant. ? continuous conduction mode the maximum value (ilmax) and the minimum value (ilmin) of the current flowing through the inductor are the same as those when p-channel tr. turns on and off. the difference between ilmax and ilmin, 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 1, 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. even if the output current (i out ) is, topen < toff as illustrat ed in the above diagram is not realized with this ic. at least, topen is equal toff (topen = toff), and when i out is further increased, ilmin becomes larger than zero (ilmin>0). the mode is referred to as the continuous mode.
r1232d 11 in the continuous mode, when equation 1 is solv ed for ton and assumed that the solution is tonc tonc = t v out /v in ............................................................................................................. equat ion 2 when the ton = tonc, the mode is the continuous mode. output current and selection of external components when p-channel tr. of l x is on: (wherein, ripple current p- p value is described as i rp , on resistance of p-channel tr. and n-channel tr. of l x are respectively described as r onp and r onn , and the dc resistor of the inductor is described as r l .) v in = v out + (r onp + r l ) i out + l i rp /ton .............................................................................. e quation 3 when p-channel tr. of l x is "off"(n-channel tr. is "on"): l i rp /toff = v f + v out + r onn i out ....................................................................................... equat ion 4 put equation 4 to equation 3 and solve for on duty of p-channel transistor, don = ton/(toff + ton), d on = (v out ? r onn i out + r l i out )/(v in + r onn i out ? r onp i out ) ........................................... equat ion 5 ripple current is as follows; i rp = (v in ? v out ? r onp i out ? r l i out ) d on /fosc/l .............................................................. e quation 6 wherein, peak current that flows through l, and l x tr. is as follows; ilmax = i out + i rp /2 .......................................................................................................... equat ion 7 consider ilmax, condition of input and ou tput and select external components. the above explanation is directed to the calcul ation in an ideal case in continuous mode.
r1232d 12 how to adjust output voltage and about phase compensation as for adjustable output type, feedback pin (v fb ) voltage is controlled to maintain 0.8v. output voltage, v out is as following equation; v out r1 + r2 = v fb :r2 v out = v fb (r1 + r2)/r2 thus, with changing the value of r1 and r2, out put voltage can be set in the specified range. in the dc/dc converter, with the load current and external components such as l and c, phase might be behind 180 degree. in this case, the phase margin of the system will be less and stability will be worse. to prevent this, phase margin should be secured with proceeding the phase. a pole is formed with external components l and c out . out lc 1/2 ~ fpole a zero (signal back to zero) is formed with r1 and cb. ? fzero ~ 1/(2p r1 cb) first, choose the appropriate value of r1, r2 and cb. set r1 + r2 value 100k ? or less. for example, if l = 4.7 h, c out = 10 f, the cut off frequency of the pole is approximately 23khz. to make the cut off frequency of the zero by r1, r2, and cb be higher than 23khz, set r1 = 33k ? and cb = 100pf.if v out is set at 2.0v, r2 = 22k ? is appropriate.
r1232d 13 external components 1.inductor select an inductor that peak current does not exceed ilmax. if larger current than allowable current flows, magnetic saturation occurs and makes transform efficiency be worse. supposed that the load current is at the same, the smaller value of l is used, the larger the ripple current is. provided that the allowable current is large in that ca se and dc current is small, therefore, for large output current, efficiency is better than using an induct or with a large value of l and vice versa. 2.capacitor as for c in , use a capacitor with low esr (equivalent series resistance) ceramic type of a capacity at least 10 f for stable operation. c out can reduce ripple of the output voltage, therefore as much as 10 f ceramic type is recommended. timing chart intemal opertional a mplifier output ce pin voltage output short intemal oscillator waveform lx pin output soft-start time stable delay time of protection latched output short intemal soft-start set voltage the timing chart as shown above describes the waveforms starting from the ic is enabled with ce and latched with protection. during the soft-start time, until the level is rising up to the internal soft-start set voltage, the duty cycle of l x is gradually wider and wider to prevent the over-s hoot of the voltage. during the term, the output of amplifier is "h". after the output voltage reaches the se t output voltage, they are balanced well. herein, if the output pin would be short circuit, the output of amplif ier would become "h" again, and the condition would continue for 2.0ms (typ.), latch circ uit would work and the output of l x would be latched with "off". (output = "high-z") if the output short is released before the latch circuit wo rks (within 2ms after output shorted), the output of amplifier is balanced in the stable state again. once the ic is latched, to release the protection, inpu t "l" with ce pin, or make the supply voltage at uvlo level or less.
r1232d 14 typical characteristics 1) output voltage vs. output current (c in = 10 f, c out = 10 f) R1232D121A r1232d331a 1.100 1.150 1.300 1.250 1.200 1 10 100 1000 output current i out (ma) output voltage v out (v) v in =5.0v 3.200 3.250 3.400 3.350 3.300 1 10 100 1000 output current i out (ma) output voltage v out (v) v in =5.0v r1232d121b r1232d331b 1.100 1.150 1.300 1.250 1.200 1 10 100 1000 output current i out (ma) output voltage v out (v) v in =5.0v 3.200 3.250 3.400 3.350 3.300 1 10 100 1000 output current i out (ma) output voltage v out (v) v in =5.0v 2) efficiency vs. output current (c in = 10 f, c out = 10 f) R1232D121A r1232d331a 0 20 100 80 50 30 90 70 60 10 40 1 10 100 1000 output current i out (ma) v in =3.3v, 5.0v (v in =5.0v) (v in =3.3v) efficiency(%) 0 20 100 80 50 30 90 70 60 10 40 1 10 100 1000 output current i out (ma) v in =5.0v efficiency(%) r1232d121b r1232d331b
r1232d 15 0 20 100 80 50 30 90 70 60 10 40 1 10 100 1000 output current i out (ma) v in =3.3v, 5.0v (v in =5.0v) (v in =3.3v) efficiency(%) 0 20 100 80 50 30 90 70 60 10 40 1 10 100 1000 output current i out (ma) efficiency(%) v in =5.0v 3) output waveform R1232D121A r1232d331a -0.04 -0.03 0.04 0.02 0.01 -0.01 -0.02 0.03 0 time t(ns) output ripple voltage(v) v in =5.0v, i out =600ma -3 -1 1 -2 2 03 -0.04 -0.03 0.04 0.02 0.01 -0.01 -0.02 0.03 0 time t(ns) output ripple voltage(v) v in =5.0v, i out =600ma -3 -1 1 -2 2 03 r1232d121b r1232d331b -0.06 -0.04 0.06 0.04 0 -0.02 0.02 time t(ns) output ripple voltage(v) v in =5.0v, i out =600ma -1.5 -0.5 0.5 -1.0 1.0 0 1.5 -0.04 -0.03 0.04 0.02 0.01 -0.01 -0.02 0.03 0 time t(ns) output ripple voltage(v) v in =5.0v, i out =600ma -1.5 -0.5 0.5 -1.0 1.0 0 1.5
r1232d 16 4) load transient response R1232D121A R1232D121A 0.8 0.4 0.2 0.6 0 -0.3 -0.1 -0.2 0.5 0.3 0.1 0.4 0.2 0 output current i out (a) output voltage output current 10ma 600ma v in =5.0v output voltage v out (v) -50 0 100 200 50 150 time t ( s) 0.8 0.4 0.2 0.6 0 0.2 0.1 0 0.8 0.6 0.4 0.7 0.5 0.3 output current i out (a) output voltage output current 600ma 10ma v in =5.0v -0.1 time t ( s) output voltage v out (v) -50 0 100 200 50 150 r1232d121b r1232d121b 0.8 0.4 0.2 0.6 0 -0.3 -0.1 -0.2 0.5 0.3 0.1 0.4 0.2 0 output current i out (a) output voltage output current 10ma 600ma v in =5.0v output voltage v out (v) -50 0 100 200 50 150 time t ( s) 0.8 0.4 0.2 0.6 0 0.2 0.1 0 0.8 0.6 0.4 0.7 0.5 0.3 output current i out (a) output voltage v out (v) output voltage output current 600ma 10ma v in =5.0v -0.1 -50 0 100 200 50 150 time t ( s) 5) output voltage vs. input voltage R1232D121A r1232d331a 1.18 1.19 1.22 1.21 1.20 2.5 4.0 5.0 5.5 3.0 3.5 4.5 6.0 input voltage v in (v) output voltage v out (v) i out =600ma 3.28 3.29 3.32 3.31 3.30 3.0 4.0 5.0 5.5 3.5 4.5 6.0 input voltage v in (v) output voltage v out (v) i out =600ma 6) oscillator frequency vs. input voltage R1232D121A r1232d121b
r1232d 17 0.90 0.95 1.10 1.05 1.00 2.5 4.0 5.0 5.5 3.0 3.5 4.5 6.0 input voltage v in (v) frequency fosc(mhz) i out =600ma 2.0 2.1 2.4 2.3 2.2 2.5 4.0 5.0 5.5 3.0 3.5 4.5 6.0 input voltage v in (v) frequency fosc(mhz) i out =600ma 7) lx transistor on resistance vs. input voltage switching tr. pch on resistance synchronous rectifier tr. nch on resistance 0.09 0.10 0.14 0.13 0.12 0.11 2.5 4.0 5.0 5.5 3.0 3.5 4.5 6.0 input voltage v in (v) on resistance( ? ) i out =200ma 0.09 0.10 0.14 0.13 0.12 0.11 2.5 4.0 5.0 5.5 3.0 3.5 4.5 6.0 input voltage v in (v) on resistance( ? ) i out =200ma 8) turn-on speed by ce pin R1232D121A R1232D121A il 200ma/div ce 5v/div v out 1v/div 200 s/div v in =5.0v, l=4.7 h rload=0 ? il 200ma/div ce 5v/div v out 1v/div 200 s/div v in =5.0v, l=4.7 h rload=12 ? r1232d331b r1232d331b
r1232d 18 il 200ma/div ce 5v/div v out 1v/div 100 s/div v in =5.0v, l=2.7 h rload=0 ? il 200ma/div ce 5v/div v out 1v/div 100 s/div v in =5.0v, l=2.7 h rload=33 ? 9) output voltage vs. temperature R1232D121A r1232d331a 1.14 1.16 1.24 1.22 1.20 1.18 -40 35 -15 10 60 85 temperature topt( c) output voltage v out (v) v in =5.0v 3.20 3.25 3.40 3.35 3.30 -40 35 -15 10 60 85 temperature topt( c) output voltage v out (v) v in =5.0v 10) oscillator frequency vs. temperature R1232D121A r1232d331b 0.70 0.80 1.30 1.20 1.10 1.00 0.90 -40 35 -15 10 60 85 temperature topt( c) frequency f ocs (mhz) v in =5.0v 2.00 2.10 2.50 2.40 2.30 2.20 -40 35 -15 10 60 85 temperature topt( c) frequency f ocs (mhz) v in =5.0v
r1232d 19 11) supply current vs. temperature R1232D121A r1232d331b 110 115 130 125 120 -40 35 -15 10 60 85 temperature topt( c) v in =5.0v supply current i dd1 ( a) 210 215 230 225 220 -40 35 -15 10 60 85 temperature topt( c) supply current i dd1 ( a) v in =5.0v 12) soft-start time vs. temperature R1232D121A r1232d331b 500 1300 900 1100 700 -40 35 -15 10 60 85 temperature topt( c) v in =5.0v, rload=0 ? soft-start time tstart (ms) 300 600 500 550 400 450 350 -40 35 -15 10 60 85 temperature topt( c) v in =5.0v, rload=0 ? soft-start time tstart (ms) 13) uvlo voltage vs. temperature R1232D121A R1232D121A 2.10 2.20 2.40 2.30 -40 35 -15 10 60 85 temperature topt( c) uvlo detector voltage uvlo01(v) 2.20 2.30 2.50 2.40 -40 35 -15 10 60 85 temperature topt( c) uvlo released voltage uvlo02(v)
r1232d 20 14) ce input voltage vs. temperature R1232D121A R1232D121A 0.5 1.0 0.8 1.5 1.3 -40 35 -15 10 60 85 temperature topt( c) ce input voltage "h" v ceh (v) v in =5.0v, ce=h threshold 0.5 1.0 0.8 1.5 1.3 -40 35 -15 10 60 85 temperature topt( c) ce input voltage "l" v cel (v) v in =5.0v, ce=l threshold 15) test input voltage vs. temperature R1232D121A 0.5 1.0 0.8 1.5 1.3 -40 35 -15 10 60 85 temperature topt( c) test input voltage v testl (v) v in =5.0v 16) lx transistor on resistance vs. temperature driver tr. pch on resistance rectifier tr.nch on resistance 0.00 pch. lx transistor on resistance r onp ( ? ) 0.20 0.10 0.30 -40 35 -15 10 60 85 temperature topt( c) v in =5.0v 0.00 nch. lx transistor on resistance r onn ( ? ) 0.20 0.10 0.30 -40 35 -15 10 60 85 temperature topt( c) v in =5.0v
r1232d 21 17) current limit vs. temperature R1232D121A r1232d331b -1.80 lx current limit i lx limit(a) -1.30 -1.05 -1.55 -0.80 -40 35 -15 10 60 85 temperature topt( c) v in =5.0v -1.80 lx current limit i lx limit(a) -1.30 -1.05 -1.55 -0.80 -40 35 -15 10 60 85 temperature topt( c) v in =5.0v 18) protection delay time vs. temperatures R1232D121A r1232d331b 0.0 protection delay time tprot(ms) 5.0 7.5 2.5 10.0 -40 35 -15 10 60 85 temperature topt( c) v in =5.0v 0.0 protection delay time tprot(ms) 3.0 5.0 2.0 4.0 1.0 6.0 -40 35 -15 10 60 85 temperature topt( c) v in =5.0v
package information pe-son-8-0510 ? son-8 unit: mm package dimensions 0.2 0.1 0.2 0.1 0.13 0.05 0.15 ? 0.15 + 0.1 0.15 ? 0.15 + 0.1 0.23 0.1 2.9 0.2 0.3 0.1 2.8 0.2 0.13 0.05 3.0 0.2 0.475typ 0.9max. 85 14 0.1 0.65 0.1 m attention : 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 discription. do not connect to other wires or land patterns. bottom view taping specification ? 1.1 0.1 2.0 0.05 4.0 0.1 0.2 0.1 1.5 +0.1 0 3.3 4.0 0.1 2.0max. tr user direction of feed 3.5 0.05 8.0 0.3 1.75 0.1 3.2 taping reel dimensions (1reel=3000pcs) 11.4 1.0 9.0 0.3 21 0.8 2 0.5 ? 60 0 ? 180 ? 1.5 +1 0 13 0.2 ?
package information pe-son-8-0510 power dissipation (son-8) 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 480mw 300mw thermal resistance ja = (125 ? 25 c)/0.48w = 208 c/w 333 c/w 0 50 100 25 75 85 125 150 ambient temperature ( c) 0 200 100 300 400 480 500 600 power dissipation p d (mw) on board free air 40 40 power dissipation measurement board pattern ic mount area (unit : mm) recommended land pattern 0.65 0.65 1.15 0.35 (unit: mm)
mark information me-r1232d-0510 r1232d series mark specification ? son-8 r 1 2 3 4 5 6 1 to 4 : product code (refer to part number vs. product code) 5 , 6 : lot number ? part number vs. product code product code product code product code part number 1 2 3 4 part number 1 2 3 4 part number 1 2 3 4 r1232d091a k 0 9 a r1232d091b k 0 9 b r1232d001c k 0 1 c r1232d101a k 1 0 a r1232d101b k 1 0 b r1232d001d k 0 1 d r1232d111a k 1 1 a r1232d111b k 1 1 b R1232D121A k 1 2 a r1232d121b k 1 2 b r1232d131a k 1 3 a r1232d131b k 1 3 b r1232d141a k 1 4 a r1232d141b k 1 4 b r1232d151a k 1 5 a r1232d151b k 1 5 b r1232d161a k 1 6 a r1232d161b k 1 6 b r1232d171a k 1 7 a r1232d171b k 1 7 b r1232d181a k 1 8 a r1232d181b k 1 8 b r1232d191a k 1 9 a r1232d191b k 1 9 b r1232d201a k 2 0 a r1232d201b k 2 0 b r1232d211a k 2 1 a r1232d211b k 2 1 b r1232d221a k 2 2 a r1232d221b k 2 2 b r1232d231a k 2 3 a r1232d231b k 2 3 b r1232d241a k 2 4 a r1232d241b k 2 4 b r1232d251a k 2 5 a r1232d251b k 2 5 b r1232d261a k 2 6 a r1232d261b k 2 6 b r1232d271a k 2 7 a r1232d271b k 2 7 b r1232d281a k 2 8 a r1232d281b k 2 8 b r1232d291a k 2 9 a r1232d291b k 2 9 b r1232d301a k 3 0 a r1232d301b k 3 0 b r1232d311a k 3 1 a r1232d311b k 3 1 b r1232d321a k 3 2 a r1232d321b k 3 2 b r1232d331a k 3 3 a r1232d331b k 3 3 b

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