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general description the MAX5033 easy-to-use, high-efficiency, high-voltage, step-down dc-dc converter operates from an input volt- age up to 76v and consumes only 350? quiescent cur- rent at no load. this pulse-width modulated (pwm) converter operates at a fixed 125khz switching frequen- cy at heavy loads, and automatically switches to pulse- skipping mode to provide low quiescent current and high efficiency at light loads. the MAX5033 includes internal frequency compensation simplifying circuit implementation. the device uses an internal low-on- resistance, high-voltage, dmos transistor to obtain high efficiency and reduce overall system cost. this device includes undervoltage lockout, cycle-by-cycle current limit, hiccup-mode output short-circuit protection, and thermal shutdown. the MAX5033 delivers up to 500ma output current. external shutdown is included, featuring 10? (typ) shutdown current. the MAX5033a/b/c versions have fixed output voltages of 3.3v, 5v, and 12v, respectively, while the MAX5033d features an adjustable output volt- age, from 1.25v to 13.2v. the MAX5033 is available in space-saving 8-pin so and 8-pin plastic dip packages and operates over the industrial (0? to +85?) temperature range. applications consumer electronics industrial distributed power features wide 7.5v to 76v input voltage range fixed (3.3v, 5v, 12v) and adjustable (1.25v to 13.2v) voltage versions 500ma output current efficiency up to 94% internal 0.4 ? high-side dmos fet 350a quiescent current at no load, 10a shutdown current internal frequency compensation fixed 125khz switching frequency thermal shutdown and short-circuit current limit 8-pin so and pdip packages MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter ________________________________________________________________ maxim integrated products 1 ordering information 19-2979; rev 0; 10/03 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part temp range pin- package output voltage (v) MAX5033ausa 0 c to +85 c 8 so MAX5033aupa 0 c to +85 c 8 pdip 3.3 MAX5033busa 0 c to +85 c 8 so MAX5033bupa 0 c to +85 c 8 pdip 5.0 MAX5033cusa 0 c to +85 c 8 so MAX5033cupa 0 c to +85 c 8 pdip 12 MAX5033dusa 0 c to +85 c 8 so MAX5033dupa 0 c to +85 c 8 pdip adj 1 2 3 4 bst vd sgnd fb 8 7 6 5 lx v in gnd on/off MAX5033 so/pdip pin configuration MAX5033 gnd bst lx v in sgnd fb d1 50sq100 vd 220 h v out 5v, 0.5a v in 7.5v to 76v 47 f 0.1 f 0.1 f 33 f on off r1 r2 on/off typical operating circuit
MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (voltages referenced to gnd, unless otherwise specified.) v in ........................................................................-0.3v to + 80v sgnd ....................................................................-0.3v to +0.3v lx.................................................................-0.8v to (v in + 0.3v) bst ...............................................................-0.3v to (v in + 10v) bst (transient < 100ns) ................................-0.3v to (v in + 15v) bst to lx................................................................-0.3v to +10v bst to lx (transient < 100ns) ................................-0.3v to +15v on/ off ........................................................-0.3v to (v in + 0.3v) vd...........................................................................-0.3v to +12v fb MAX5033a/MAX5033b/MAX5033c ...................-0.3v to +15v MAX5033d .........................................................-0.3v to +12v v out short-circuit duration...........................................indefinite vd short-circuit duration ..............................................indefinite continuous power dissipation (t a = +70 c) 8-pin pdip (derate 9.1mw/ c above +70 c)...............727mw 8-pin so (derate 5.9mw/ c above +70 c)..................471mw operating temperature range MAX5033_u_ _ ...................................................0 c to +85 c storage temperature range .............................-65 c to +150 c junction temperature ......................................................+150 c lead temperature (soldering, 10s) .................................+300 c electrical characteristics (v in = +12v, v on/ off = +12v, i out = 0, t a = 0 c to +85 c, unless otherwise noted. typical values are at t a = +25 c. see the typical application circuit .) parameter symbol conditions min typ max units MAX5033a 7.5 76.0 MAX5033b 7.5 76.0 MAX5033c 15 76 input voltage range v in MAX5033d 7.5 76.0 v undervoltage lockout uvlo 5.2 v MAX5033a, v in = 7.5v to 76v, i out = 20ma to 500ma 3.185 3.3 3.415 MAX5033b, v in = 7.5v to 76v, i out = 20ma to 500ma 4.85 5.0 5.15 output voltage v out MAX5033c, v in = 15v to 76v, i out = 20ma to 500ma 11.64 12 12.36 v feedback voltage v fb v in = 7.5v to 76v, MAX5033d 1.192 1.221 1.250 v v in = 12v, i load = 500ma, MAX5033a 86 v in = 12v, i load = 500ma, MAX5033b 90 v in = 24v, i load = 500ma, MAX5033c 94 efficiency v in = 12v, v out = 5v, i load = 500ma, MAX5033d 90 % v fb = 3.5v, v in = 7.5v to 76v, MAX5033a 350 460 v fb = 5.5v, v in = 7.5v to 76v, MAX5033b 350 460 v fb = 13v, v in = 15v to 76v, MAX5033c 350 460 quiescent supply current i q v fb = 1.3v, MAX5033d 350 460 a shutdown current i shdn v on/ off = 0v, v in = 7.5v to 76v 10 45 a peak switch current limit i lim (note 1) 0.95 1.5 2.0 a switch leakage current i ol v in = 76v, v on/ off = 0v, v lx = 0v 1 a
MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter _______________________________________________________________________________________ 3 electrical characteristics (continued) (v in = +12v, v on/ off = +12v, i out = 0, t a = 0 c to +85 c, unless otherwise noted. typical values are at t a = +25 c. see the typical application circuit .) parameter symbol conditions min typ max units switch on-resistance r ds ( on ) i switch = 500ma 0.4 0.80 ? pfm threshold i pfm minimum switch current in any cycle 35 65 90 ma fb input bias current i b MAX5033d -12 +0.01 +12 na on/ off control input on/ off input-voltage threshold v on/ off rising trip point 1.53 1.69 1.85 v on/ off input-voltage hysteresis v hyst 100 mv on/ off input current i on/ off v on/ off = 0v to v in 10 150 na oscillator oscillator frequency f osc 109 125 135 khz maximum duty cycle d max MAX5033d 95 % voltage regulator regulator output voltage vd v in = 8.5v to 76v, i l = 0ma 6.9 7.8 8.8 v dropout voltage 7.5v v in 8.5v, i l = 1ma 2.0 v load regulation ? vd/ ? i vd 0 to 5ma 150 mv/ma package thermal characteristics so package (jedec 51) 170 thermal resistance (junction to ambient) ja dip package (jedec 51) 110 c/w thermal shutdown thermal-shutdown junction temperature t sh +160 c thermal-shutdown hysteresis t hyst 20 c note 1: switch current at which the current-limit is activated.
typical operating characteristics (v in = 12v, v on/ off = 12v, t a = 0 c to +85 c, unless otherwise noted. typical values are at t a = +25 c. see the typical application circuit , if applicable.) MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter 4 _______________________________________________________________________________________ output voltage vs. temperature (MAX5033cusa, v out = 12v) MAX5033 toc01 temperature ( c) v out (v) 11.9 12.0 12.1 12.2 12.3 12.4 11.8 75 50 25 0 100 i out = 0.1a i out = 0.5a output voltage vs. temperature (MAX5033busa, v out = 5v) MAX5033 toc02 temperature ( c) v out (v) 4.95 5.00 5.05 5.10 4.90 i out = 0.1a i out = 0.5a 75 50 25 0 100 line regulation (MAX5033cusa, v out = 12v) MAX5033 toc03 input voltage (v) v out (v) 50 60 70 40 30 20 11.9 12.0 12.1 12.2 12.3 12.4 11.8 10 80 i out = 0a i out = 0.5a line regulation (MAX5033busa, v out = 5v) MAX5033 toc04 input voltage (v) v out (v) 46 56 66 36 26 16 4.95 5.00 5.05 5.10 4.90 676 i out = 0a i out = 0.5a load regulation (MAX5033cusa, v out = 12v) MAX5033 toc05 i load (ma) v out (v) 400 300 200 100 11.9 12.0 12.1 12.2 12.3 12.4 11.8 0 500 v in = 24v v in = 76v load regulation (MAX5033busa, v out = 5v) MAX5033 toc06 i load (ma) v out (v) 400 300 200 100 4.95 5.00 5.05 5.10 4.90 0 500 v in = 7.5v, 24v v in = 76v efficiency vs. load current (MAX5033busa, v out = 5v) MAX5033 toc07 load current (ma) efficiency (%) 400 300 200 100 30 50 40 20 10 70 60 100 90 80 0 0 500 v in = 7.5v v in = 12v v in = 24v v in = 48v v in = 76v efficiency vs. load current (MAX5033cusa, v out = 12v) MAX5033 toc08 load current (ma) efficiency (%) 400 300 200 100 30 50 40 20 10 70 60 100 90 80 0 0 500 v in = 15v v in = 24v v in = 48v v in = 76v output current limit vs. temperature MAX5033 toc09 temperature ( c) output current limit (a) 0.8 1.1 1.4 1.7 2.0 0.5 MAX5033busa v out = 5v 5% drop in v out 75 50 25 0 100
typical operating characteristics (continued) (v in = 12v, v on/ off = 12v, t a = 0 c to +85 c, unless otherwise noted. typical values are at t a = +25 c. see the typical application circuit , if applicable.) MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter _______________________________________________________________________________________ 5 output current limit vs. input voltage MAX5033 toc10 input voltage (v) output current limit (a) 66 56 46 36 26 16 0.8 1.1 1.4 1.7 2.0 0.5 676 MAX5033busa v out = 5v 5% drop in v out quiescent supply current vs. temperature MAX5033 toc11 temperature ( c) quiescent supply current ( a) 240 280 320 360 400 200 75 50 25 0 100 quiescent supply current vs. input voltage MAX5033 toc12 input voltage (v) quiescent supply current ( a) 56 66 46 36 26 16 230 260 290 320 350 200 676 shutdown current vs. temperature MAX5033 toc13 temperature ( c) shutdown current ( a) 4 8 12 16 20 0 75 50 25 0 100 shutdown current vs. input voltage MAX5033 toc14 input voltage (v) shutdown current ( a) 56 46 36 26 16 5 10 15 20 25 0 676 66 output voltage vs. input voltage MAX5033 toc15 v in (v) v out (v) 12 9 6 3 3 6 9 12 15 0 015 MAX5033cusa v out = 12v v on/off = v in i out = 0.3a i out = 0.5a MAX5033busa load-transient response MAX5033 toc16 400 s/div b a a: v out , 200mv/div, ac-coupled b: i out , 500ma/div, 100ma to 500ma v out = 5v MAX5033busa load-transient response MAX5033 toc17 400 s/div b a a: v out , 100mv/div, ac-coupled b: i out , 200ma/div, 100ma to 250ma v out = 5v MAX5033busa load-transient response MAX5033 toc18 400 s/div b a a: v out , 100mv/div, ac-coupled b: i out , 500ma/div, 250ma to 500ma v out = 5v
typical operating characteristics (continued) (v in = 12v, v on/ off = 12v, t a = 0 c to +85 c, unless otherwise noted. typical values are at t a = +25 c. see the typical application circuit , if applicable.) MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter 6 _______________________________________________________________________________________ MAX5033busa lx waveforms MAX5033 toc19 4 s/div b 0 a a: switch voltage (lx pin) 20v/div, v in = 48v b: inductor current, 200ma/div, (i out = 500ma) MAX5033busa lx waveforms MAX5033 toc20 4 s/div b 0 a 0 a: switch voltage, 20v/div, v in = 48v b: inductor current, 100ma/div (i out = 30ma) MAX5033busa lx waveforms MAX5033 toc21 4 s/div b a a: switch voltage (lx pin), 20v/div, v in = 48v b: inductor current, 100ma/div (i out = 0) 0 0 MAX5033busa startup waveform (i o = 0) MAX5033 toc22 1ms/div b a a: v on/off , 2v/div b: v out , 2v/div MAX5033busa startup waveform (i o = 0.5a) MAX5033 toc23 1ms/div b a a: v on/off , 2v/div b: v out , 2v/div peak switch current vs. input voltage MAX5033 toc24 input voltage (v) peak switch current (a) 56 66 46 36 26 16 0.8 1.1 1.4 1.7 2.0 0.5 676 MAX5033busa v out = 5v 5% drop in v out
MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter _______________________________________________________________________________________ 7 pin description pin name function 1 bst boost capacitor connection. connect a 0.1f ceramic capacitor from bst to lx. 2 vd internal regulator output. bypass vd to gnd with a 0.1f ceramic capacitor. 3 sgnd internal connection. sgnd must be connected to gnd. 4fb output sense feedback connection. for fixed output voltage (MAX5033a, MAX5033b, MAX5033c), connect fb to v out . for adjustable output voltage (MAX5033d), use an external resistive voltage-divider to set v out . v fb regulating set point is 1.22v. 5 on/ off shutdown control input. pull on/ off low to put the device in shutdown mode. drive on/ off high for normal operation. 6 gnd ground 7v in input voltage. bypass v in to gnd with a low-esr capacitor as close to the device as possible. 8 lx source connection of internal high-side switch enable lx bst v in on/off v ref regulator (for driver) regulator (for analog) osc ramp high-side current sense i ref-pfm i ref-lim cpfm 1.69v cilim fb x1 v ref eamp control logic cpwm vd gnd r h r l clk sgnd MAX5033 type 3 compensation thermal shutdown ramp simplified block diagram
MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter 8 _______________________________________________________________________________________ detailed description the MAX5033 step-down dc-dc converter operates from a 7.5v to 76v input voltage range. a unique volt- age-mode control scheme with voltage feedforward and an internal switching dmos fet provides high effi- ciency over a wide input voltage range. this pulse- width modulated converter operates at a fixed 125khz switching frequency. the device also features automat- ic pulse-skipping mode to provide low quiescent cur- rent and high efficiency at light loads. under no load, the MAX5033 consumes only 350a, and in shutdown mode, consumes only 10a. the MAX5033 also fea- tures undervoltage lockout, hiccup-mode output short- circuit protection, and thermal shutdown. shutdown mode drive on/ off to ground to shut down the MAX5033. shutdown forces the internal power mosfet off, turns off all internal circuitry, and reduces the v in supply cur- rent to 10a (typ). the on/ off rising threshold is 1.69v (typ). before any operation begins, the voltage at on/ off must exceed 1.69v (typ). the on/ off input has 100mv hysteresis. undervoltage lockout (uvlo) use the on/ off function to program the uvlo thresh- old at the input. connect a resistive voltage-divider from v in to gnd with the center node to on/ off as shown in figure 1. calculate the threshold value by using the following formula: the minimum recommended v uvlo(th) is 6.5v, 7.5v, and 13v for the output voltages of 3.3v, 5v, and 12v, respectively. the recommended value for r2 is less than 1m ? . if the external uvlo threshold-setting divider is not used, an internal undervoltage lockout feature monitors the supply voltage at v in and allows operation to start when v in rises above 5.2v (typ). this feature can be used only when v in rise time is faster than 2ms. for slower v in rise time, use the resistive-divider at on/ off . boost high-side gate drive (bst) connect a flying bootstrap capacitor between lx and bst to provide the gate-drive voltage to the high-side n-channel dmos switch. the capacitor is alternately charged from the internally regulated output-voltage vd and placed across the high-side dmos driver. use a 0.1f, 16v ceramic capacitor located as close to the device as possible. on startup, an internal low-side switch connects lx to ground and charges the bst capacitor to vd. once the bst capacitor is charged, the internal low-side switch is turned off and the bst capacitor voltage provides the necessary enhancement voltage to turn on the high-side switch. thermal overload protection the MAX5033 features integrated thermal-overload protection. thermal-overload protection limits total power dissipation in the device, and protects the device in the event of a fault condition. when the die temperature exceeds +160 c, an internal thermal sen- sor signals the shutdown logic, turning off the internal power mosfet and allowing the ic to cool. the ther- mal sensor turns the internal power mosfet back on after the ic s die temperature cools down to +140 c, resulting in a pulsed output under continuous thermal- overload conditions. applications information setting the output voltage the MAX5033a/b/c have preset output voltages of 3.3v, 5.0v, and 12v, respectively. connect fb to the preset output voltage (see the typical operating circuit ). the MAX5033d offers an adjustable output voltage. set the output voltage with a resistive voltage-divider con- nected from the circuit s output to ground (figure 1). connect the center node of the divider to fb. choose r4 less than 15k ? , then calculate r3 as follows: r v r out 3 122 122 4 = ? (.) . v r r v uvlo th () . =+ ? ? ? ? ? ? 1 1 2 185 MAX5033d gnd bst lx v in sgnd fb d1 50sq100 vd 220 h v out 5v, 0.5a v in 7.5v to 76v 47 f 0.1 f 0.1 f c out 33 f r1 r2 r3 41.2k ? r4 13.3k ? on/off figure 1. adjustable output voltage
MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter _______________________________________________________________________________________ 9 the MAX5033 features internal compensation for opti- mum closed-loop bandwidth and phase margin. with the preset compensation, it is strongly advised to sense the output immediately after the primary lc. inductor selection the choice of an inductor is guided by the voltage dif- ference between v in and v out , the required output current, and the operating frequency of the circuit. use an inductor with a minimum value given by: where: d = v out /v in , i outmax is the maximum output current required, and f sw is the operating frequency of 125khz. use an inductor with a maximum saturation current rating equal to at least twice the peak output current of the circuit. use inductors with low dc resis- tance for higher efficiency. selecting a rectifier the MAX5033 requires an external schottky rectifier as a freewheeling diode. connect this rectifier close to the device using short leads and short pc board traces. choose a rectifier with a continuous current rating greater than the highest expected output current. use a rectifier with a voltage rating greater than the maximum expected input voltage, v in . use a low forward-voltage schottky rectifier for proper operation and high efficien- cy. avoid higher than necessary reverse-voltage schottky rectifiers that have higher forward-voltage drops. use a schottky rectifier with forward-voltage drop (v fb ) less than 0.45v at +25 c and maximum load current to avoid forward biasing of the internal body diode (lx to ground). internal body-diode con- duction may cause excessive junction temperature rise and thermal shutdown. use table 1 to choose the proper rectifier at different input voltages and output current. input bypass capacitor the discontinuous input current waveform of the buck converter causes large ripple currents in the input capacitor. the switching frequency, peak inductor cur- rent, and the allowable peak-to-peak voltage ripple that reflects back to the source dictate the capacitance requirement. the MAX5033 high switching frequency allows the use of smaller value input capacitors. the input ripple is comprised of ? v q (caused by the capacitor discharge) and ? v esr (caused by the esr of the capacitor). use low-esr aluminum electrolytic capacitors with high ripple-current capability at the input. assuming that the contribution from the esr and capaci- tor discharge is equal to 90% and 10%, respectively, cal- culate the input capacitance and the esr required for a specified ripple using the following equations: i out is the maximum output current of the converter and f sw is the oscillator switching frequency (125khz). for example, at v in = 48v and v out = 3.3v, the esr and input capacitance are calculated for the input peak-to- peak ripple of 100mv or less, yielding an esr and capacitance value of 130m ? and 27f, respectively. low-esr, ceramic, multilayer chip capacitors are recom- mended for size-optimized application. for ceramic capacitors, assume the contribution from esr and capac- itor discharge is equal to 10% and 90%, respectively. the input capacitor must handle the rms ripple current without significant rise in temperature. the maximum capacitor rms current occurs at about 50% duty cycle. () () esr v i i c idd vf where i vv v vf l d v v in esr out l in out qsw l in out out in sw out in = + ? ? ? ? ? ? = ? = ? = ? ? ? ? 2 1 l vv d if in out outmax sw = ? () . 02 v in (v) diode part number manufacturer 15mq040n ir b240a diodes, inc. b240 central semiconductor 7.5 to 36 mbrs240, mbrs1540 on semiconductor 30bq060 ir b360a diodes, inc. cmsh3-60 central semiconductor 7.5 to 56 mbrd360, mbr3060 on semiconductor 50sq100, 50sq80 ir 7.5 to 76 mbrm5100 diodes, inc. table 1. diode selection
MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter 10 ______________________________________________________________________________________ ensure that the ripple specification of the input capaci- tor exceeds the worst-case capacitor rms ripple cur- rent. use the following equations to calculate the input capacitor rms current: i prms is the input switch rms current, i avgin is the input average current, and is the converter efficiency. the esr of aluminum electrolytic capacitors increases significantly at cold temperatures. use a 1f or greater value ceramic capacitor in parallel with the aluminum electrolytic input capacitor, especially for input voltages below 8v. output filter capacitor the worst-case peak-to-peak and rms capacitor ripple current, allowable peak-to-peak output ripple voltage, and the maximum deviation of the output voltage dur- ing load steps determine the capacitance and the esr requirements for the output capacitors. the output capacitance and its esr form a zero, which improves the closed-loop stability of the buck regulator. choose the output capacitor so the esr zero frequency (f z ) occurs between 20khz to 40khz. use the following equation to verify the value of f z . capacitors with 100m ? to 250m ? esr are recommended to ensure the closed- loop stability while keeping the output ripple low. the output ripple is comprised of ? v oq (caused by the capacitor discharge) and ? v oesr (caused by the esr of the capacitor). use low-esr tantalum or aluminum electrolytic capacitors at the output. assuming that the contribution from the esr and capacitor discharge equal 80% and 20%, respectively, calculate the output capacitance and the esr required for a specified rip- ple using the following equations: the MAX5033 has an internal soft-start time (t ss ) of 400s. it is important to keep the output rise time at startup below t ss to avoid output overshoot. the output rise time is directly proportional to the output capacitor. use 68f or lower capacitance at the output to control the overshoot below 5%. in a dynamic load application, the allowable deviation of the output voltage during the fast-transient load dic- tates the output capacitance value and the esr. the output capacitors supply the step load current until the controller responds with a greater duty cycle. the response time (t response ) depends on the closed- loop bandwidth of the converter. the resistive drop across the capacitor esr and capacitor discharge cause a voltage droop during a step load. use a com- bination of low-esr tantalum and ceramic capacitors for better transient load and ripple/noise performance. keep the maximum output voltage deviation above the tolerable limits of the electronics being powered. assuming a 50% contribution from the output capaci- tance discharge and the esr drop, use the following equations to calculate the required esr and capaci- tance value: where i step is the load step and t response is the response time of the controller. controller response time is approximately one-third of the reciprocal of the closed-loop unity-gain bandwidth, 20khz (typ). pc board layout considerations proper pc board layout is essential. minimize ground noise by connecting the anode of the schottky rectifier, the input bypass-capacitor ground lead, and the output filter-capacitor ground lead to a single point (star- c it v out step response oq = ? esr v i out oesr step = ? c i vf out l oq sw ? ? 22 . esr v i out oesr l = ? ? f c esr z out out = 1 2 iiiii d i vi v ii i ii i and d v v prms pk dc pk dc avgin out out in pk out l dc out l out in =++ () ? ? ? ? = =+ = ? = 22 3 22 , ?? iii where crms prms avgin =? 22
ground configuration). a ground plane is required. minimize lead lengths to reduce stray capacitance, trace resistance, and radiated noise. in particular, place the schottky rectifier diode right next to the device. also, place bst and vd bypass capacitors very close to the device. use the pc board copper plane connecting to v in and lx for heat sinking. MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter ______________________________________________________________________________________ 11 MAX5033 gnd bst lx v in sgnd fb d1 vd l1 v out v in c in 0.1 f 0.1 f c out r1 r2 on/off figure 2. fixed output voltages v in (v) v out (v) i out (a) external components 7.5 to 76 3.3 0.5 c in = 47f, panasonic, eevfk2a470q c out = 47f, vishay sprague, 594d476x_016c2t c bst = 0.1f, 0805 r1 = 1m ? 1%, 0805 r2 = 384k ? 1%, 0805 d1 = 50sq100, ir l1 = 150h, coilcraft inc., do5022p-154 7.5 to 76 5 0.5 c in = 47f, panasonic, eevfk2a470q c out = 33f, vishay sprague, 594d336x_016c2t c bst = 0.1f, 0805 r1 = 1m ? 1%, 0805 r2 = 384k ? 1%, 0805 d1 = 50sq100, ir l1 = 220h, coilcraft inc., do5022p-224 15 to 76 12 0.5 c in = 47f, panasonic, eevfk2a470q c out = 15f, vishay sprague, 594d156x_025c2t c bst = 0.1f, 0805 r1 = 1m ? 1%, 0805 r2 = 384k ? 1%, 0805 d1 = 50sq100, ir l1 = 330h, coilcraft inc., do5022p-334 table 2. typical external components selection (circuit of figure 2) application circuits
MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter 12 ______________________________________________________________________________________ v in (v) v out (v) i out (a) external components 3.3 0.5 c in = 100f, panasonic, eevfk1e101p c out = 47f, vishay sprague, 594d476x_016c2t c bst = 0.1f, 0805 r1 = 1m ? 1%, 0805 r2 = 274k ? 1%, 0805 d1 = b220/a, diodes inc. l1 = 150h, coilcraft inc., do5022p-154 9 to 14 5 0.5 c in = 100f, panasonic, eevfk1e101p c out = 33f, vishay sprague, 594d336x_016c2t c bst = 0.1f, 0805 r1 = 1m ? 1%, 0805 r2 = 274k ? 1%, 0805 d1 = b220/a, diodes inc. l1 = 220h, coilcraft inc., do5022p-224 3.3 0.5 c in = 100f, panasonic, eevfk1h101p c out = 47f, vishay sprague, 594d476x_016c2t c bst = 0.1f, 0805 r1 = 1m ? 1%, 0805 r2 = 130k ? 1%, 0805 d1 = b240/a, diodes inc. l1 = 150h, coilcraft inc., do5022p-154 5 0.5 c in = 100f, panasonic, eevfk1h101p c out = 33f, vishay sprague, 594d336x_016c2t c bst = 0.1f, 0805 r1 = 1m ? 1%, 0805 r2 = 130k ? 1%, 0805 d1 = b240/a, diodes inc. l1 = 220h, coilcraft inc., do5022p-224 18 to 36 12 0.5 c in = 100f, panasonic, eevfk1h101p c out = 15f, vishay sprague, 594d156x_025c2t c bst = 0.1f, 0805 r1 = 1m ? 1%, 0805 r2 = 130k ? 1%, 0805 d1 = b240/a, diodes inc. l1 = 330h, coilcraft inc., do5022p-334 table 2. typical external components selection (circuit of figure 2) (continued)
MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter ______________________________________________________________________________________ 13 supplier phone fax website avx 843-946-0238 843-626-3123 www.avxcorp.com coilcraft 847-639-6400 847-639-1469 www.coilcraft.com diodes incorporated 805-446-4800 805-446-4850 www.diodes.com nichicon 858-824-1515 858-824-1525 www.nichicon.com panasonic 714-373-7366 714-737-7323 www.panasonic.com sanyo 619-661-6835 619-661-1055 www.sanyo.com tdk 847-803-6100 847-390-4405 www.component.tdk.com vishay 402-563-6866 402-563-6296 www.vishay.com table 3. component suppliers MAX5033 c in 47 f c out 33 f l1 220 h fb v out 5v at 0.5a bst lx sgnd 0.1 f 0.1 f gnd v in 12v v in ptc* rt ct d1 b240 vd *locate ptc as close to heat-dissipating components as possible. on/off figure 3. load temperature monitoring with on/ off (requires accurate v in )
MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter 14 ______________________________________________________________________________________ MAX5033b c in 47 f c out 68 f l1 220 h fb v out 5v at 0.5a bst lx sgnd 0.1 f 0.1 f gnd v in 7.5v to 36v v in r1 rt ct d1 b240 vd on/off MAX5033a c' in 68 f c' out 68 f l1' 150 h fb v' out 3.3v at 0.5a bst lx sgnd 0.1 f 0.1 f gnd v in r1* rt' ct' d1' b240 vd on/off figure 4. dual-sequenced dc-dc converters (startup delay determined by r1/r1? ct/ct?and rt/rt? chip information transistor count: 4344 process: bicmos
MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter ______________________________________________________________________________________ 15 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) soicn .eps package outline, .150" soic 1 1 21-0041 b rev. document control no. approval proprietary information title: top view front view max 0.010 0.069 0.019 0.157 0.010 inches 0.150 0.007 e c dim 0.014 0.004 b a1 min 0.053 a 0.19 3.80 4.00 0.25 millimeters 0.10 0.35 1.35 min 0.49 0.25 max 1.75 0.050 0.016 l 0.40 1.27 0.394 0.386 d d mindim d inches max 9.80 10.00 millimeters min max 16 ac 0.337 0.344 ab 8.75 8.55 14 0.189 0.197 aa 5.004.80 8 n ms012 n side view h 0.2440.228 5.80 6.20 e 0.050 bsc 1.27 bsc c h e e b a1 a d 0-8 l 1 variations:
package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) MAX5033 500ma, 76v, high-efficiency, maxpower step-down dc-dc converter maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2003 maxim integrated products printed usa is a registered trademark of maxim integrated products. pdipn.eps

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