View MAX15029ATBV_4617922.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

general description the max15029/max15030 low-dropout linear regula- tors operate from input voltages as low as 1.425v and deliver up to 500ma of continuous output current with a typical dropout voltage of only 40mv. the output volt- age is adjustable from 0.5v to v in and is ?% accurate over load and line variations, from -40? to +125?. the max15030 features a bias input of 3v to 5.5v from an always-on power supply. the bias input current is reduced down to less than 2? during the shutdown. these regulators use small, 1? ceramic input capaci- tors and 2.2? ceramic output capacitors to deliver 500ma output current. high bandwidth provides excel- lent transient response and limits the output voltage devi- ation to 10mv for a 100ma to 500ma load step, with only a 2.2? ceramic output capacitor, and the voltage devia- tions can be reduced further by increasing the output capacitor. these devices offer a logic-controlled shutdown input to reduce input current (i in ) consumption down to less than 5.5? in standby mode. other features include a soft-start to reduce inrush current, short-circuit protec- tion, and thermal-overload protection. the max15030 features a bias input allowing a sec- ondary supply to keep the ldo? internal circuitry alive if the voltage on in goes to 0. both devices are fully specified from -40? to +125? and are available in a 10-pin thermally enhanced tdfn package (3mm x 3mm) that includes an exposed pad for optimal power dissipation. for a 1a version of these ldos, refer to the max15027/max15028 data sheet. applications automotive (dead-man ldo) servers storage networking base stations optical modules ate features ? 1.425v to 3.6v input voltage range ? output voltage programmable from 0.5v to v in ? guaranteed maximum 150mv dropout at 500ma output current ? 2% output accuracy over load, line, and temperature ? stable with ceramic capacitors ? fast transient response ? 60? operating bias supply current ? 1.2? shutdown bias supply current ? short-circuit and thermal protection ? -40? to +125? operating temperature range ? soft-start limits inrush current ? thermally enhanced 3mm x 3mm tdfn package max15029/max15030 1.425v to 3.6v input, 500ma low-dropout regulators with bias input ________________________________________________________________ maxim integrated products 1 1 + 3 4 10 8 7 out gnd fb in in i.c. max15029 29 out in 56 ss en ep tdfn (3mm x 3mm) top view pin configurations ordering information 19-4586; rev 1; 2/11 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. pin configurations continued at end of data sheet. part temp range pin- package top mark max15029 atb+ -40c to +125c 10 tdfn-ep* +auf max15029atb/v+ -40c to + 125c 10 tdfn-ep* +axk max15030 atb+ -40c to +125c 10 tdfn-ep* +aug /v denotes an automotive qualified part. + denotes a lead(pb)-free/rohs-compliant package. for tape-and-reel orders, add a ??after the ?.? * ep = exposed pad. typical operating circuits appear at end of data sheet.
max15029/max15030 1.425v to 3.6v input, 500ma low-dropout regulators with bias input 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (circuit of figure 1; v in = 1.8v, v out = 1.2v, en = in for max15029, en = bias for max15030, i out = 100ma, t a = t j = -40? to +125?. typical values are at t a = +25?, unless otherwise noted.) (note 2) 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. in, fb, ss, i.c. to gnd..........................................-0.3v to +4.0v bias to gnd.............................................................-0.3v to +6v en to gnd ................-0.3v to the lower of (v bias + 0.3v) or +6v out to gnd ................................................-0.3v to (v in + 0.3v) output short-circuit duration.....................................continuous continuous power dissipation (t a = +70?) tdfn (derate 24.4mw/? above +70?)....................1951mw operating junction temperature range ...........-40? to +125? maximum junction temperature .....................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? package thermal characteristics (note 1) tdfn junction-to-ambient thermal resistance ( ja ) ............41?/w junction-to-case thermal resistance ( jc ) ...................9?/w parameter symbol conditions min typ max units in max15029 1.425 3.600 v bias = 3v to 5.5v 1.425 3.600 input voltage range v in max15030 bias = in 3.000 3.600 v max15029 1.275 1.325 1.375 undervoltage lockout v uvlo v in rising max15030 1.04 1.09 1.14 v undervoltage lockout hysteresis v uvlo_hyst i out = 2ma 50 mv v in = 1.425v to 3.6v, v out = 1.2v, i out = 1ma, v bias = 3.3v 160 275 410 v in = 3.6v, v out = 3.3v, i out = 100ma 180 325 560 quiescent gnd current i gnd v in = 3.3v, v out = 3.3v, i out = 500ma 170 315 470 a input supply current in shutdown i in_sd v en = 0v (t a = -40c to +85c) 0.1 5.5 a bias (max15030) input voltage range v bias 3 5.5 v undervoltage lockout v bias_uvlo v bias rising 2.3 2.5 2.7 v undervoltage lockout hysteresis i out = 2ma 110 mv quiescent input supply current i bias v en = v bias 20 60 120 a v in = 0v, v out = 0v, v bias = 3.3v 1.2 2 v in = 3.3v, v out = 0v, v bias = 3.3v 1.2 2 input supply current in shutdown i bias_sd en = gnd v in = 3.3v, v out = 0v, v bias = 5v 1.5 3 a note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four- layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial .
max15029/max15030 1.425v to 3.6v input, 500ma low-dropout regulators with bias input _______________________________________________________________________________________ 3 electrical characteristics (continued) (circuit of figure 1; v in = 1.8v, v out = 1.2v, en = in for max15029, en = bias for max15030, i out = 100ma, t a = t j = -40? to +125?. typical values are at t a = +25?, unless otherwise noted.) (note 2) note 2: all devices are production tested at t a = +25?. limits over the operating temperature range are guaranteed by design and characterization. parameter symbol conditions min typ max units out output voltage range v out 0.5 3.3 v load regulation i out = 1ma to 500ma 0.01 mv/ma line regulation v in = 1.425v to 3.6v, v out = 1.2v, i out = 1ma 4 mv dropout voltage (v in - v out ) (note 3) v do i out = 500ma, v out = 1.2v, v in = 1.5v 40 150 mv output current limit i lim v fb = 300mv 0.7 0.85 1.0 a fb threshold accuracy v fb v out = 1.125v to 3.3v, v in = (v out + 0.3v) to 3.6v, i out = 1ma to 500ma 0.489 0.499 0.509 v input current i fb v fb = 0.488v 0.1 0.2 a en/soft-start v ih 1.05 enable input threshold (max15030) v il v bias = 5v 0.4 v v ih 1.05 enable input threshold (max15029) v il v in = 1.8v 0.4 v soft-start charging current i ss 5 a soft-start reference voltage v ss 0.499 v thermal shutdown thermal shutdown threshold t j rising 165 c thermal shutdown hysteresis 15 c
bias current vs. bias voltage max15029 toc04 bias voltage (v) bias current ( a) 5 4 3 2 10 20 30 40 50 60 70 0 16 v in = 1.8v v out = 1.5v i out = 0 bias current vs. output current max15029 toc05 output current (ma) bias current ( a) 600 400 200 51 52 53 54 55 56 57 58 59 60 50 0 800 v bias = 5.5v v bias = 3.3v ground current vs. output current max15029 toc06 output current (ma) ground current (ma) 400 300 200 100 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 0 500 v bias = 3.3v max15029/max15030 1.425v to 3.6v input, 500ma low-dropout regulators with bias input 4 _______________________________________________________________________________________ typical operating characteristics (circuit of figure 1, v in = 1.8v, v out = 1.5v, i out = 500ma, t a = +25?, unless otherwise noted.) output voltage vs. input voltage max15029 toc01 input voltage (v) output voltage (v) 3.5 3.0 0.5 1.0 1.5 2.0 2.5 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 0 4.0 i out = 0 v bias = 3.3v output voltage vs. output current max15029 toc02 output current (ma) output voltage (v) 600 400 200 1.46 1.47 1.48 1.49 1.50 1.51 1.45 0 800 v bias = 3.3v input current vs. input voltage max15029 toc03 input voltage (v) input current (ma) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 0 4.0 v bias = 3.3v i out = 0 dropout voltage vs. output current max15029 toc07 output current (ma) dropout voltage (mv) 600 400 200 10 20 30 40 50 60 70 80 90 0 0 800 v out = 1.5v v bias = 3.3v feedback voltage vs. temperature max15029 toc08 temperature ( c) feedback voltage (mv) 125 100 75 50 25 0 -25 497.0 497.5 498.0 498.5 499.0 499.5 496.5 -50 150 i out = 0 i out = 500ma
typical operating characteristics (continued) (circuit of figure 1, v in = 1.8v, v out = 1.5v, i out = 500ma, t a = +25?, unless otherwise noted.) max15029/max15030 1.425v to 3.6v input, 500ma low-dropout regulators with bias input _______________________________________________________________________________________ 5 output voltage vs. temperature max15029 toc09 temperature ( c) output voltage (v) 125 100 75 50 25 0 -25 1.48 1.49 1.50 1.51 1.52 1.53 1.47 -50 150 i out = 0 i out = 500ma output voltage vs. output current max15029 toc10 output current (ma) output voltage (v) 600 400 200 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 0 800 v in = 1.2v v in = 1.8v t a = +125 c v out = 1.5v current limit vs. temperature max15029 toc11 temperature ( c) current limit (ma) 125 100 50 75 0 25 -25 770 790 810 830 850 870 890 910 930 950 750 -50 150 power-down response max15029 toc14 20ms/div 1v/div v out v in 2v/div 0 0 i out = 500ma load-transient response max15029 toc12 20 s/div 20ma/div i out v out 10mv/div ac-coupled 0 i out = 100ma to 500ma to 100ma power-up response max15029 toc13 2ms/div 1v/div v out v in 1v/div 0 0 i out = 500ma
max15029/max15030 1.425v to 3.6v input, 500ma low-dropout regulators with bias input 6 _______________________________________________________________________________________ pin description pin max15029 max15030 name function 1, 2, 3 1, 2 in regulator input. 1.425v to 3.6v voltage range. bypass to gnd with at least 1? of ceramic capacitance. in is high impedance when the ldo is shut down. 3 bias internal circuitry supply input. bias supplies the power for the internal circuitry. 3v to 5.5v voltage range. 4 4 i.c. internally connected. connect i.c. directly to gnd. 55en ldo enable. drive en high to enable the ldo or connect to in (bias for max15030) for always-on operation. drive en low to disable the ldo and place the ic in low-power shutdown mode. 66ss soft-start input. for typical operation, connect a 0.1? capacitor from ss to gnd. the soft-start timing is dependent on the value of this capacitor. see the soft-start section. 77fb feedback input. connect fb to the center of a resistor-divider connected between out and gnd to set the output voltage. see the programming the output voltage section. 8 8 gnd ground 9, 10 9, 10 out regulator output. bypass out to gnd with at least 2.2? of ceramic capacitance for 500ma load operation. ep exposed pad. connect ep to gnd and a large copper ground plane to facilitate package power dissipation. typical operating characteristics (continued) (circuit of figure 1, v in = 1.8v, v out = 1.5v, i out = 500ma, t a = +25?, unless otherwise noted.) turn-off with enable response max15029 toc16 4 s/div 1v/div v out v en 2v/div 0 0 i out = 500ma turn-on with enable response max15029 toc15 2ms/div 1v/div v out v en 2v/div 0 0 i out = 500ma
max15029/max15030 1.425v to 3.6v input, 500ma low-dropout regulators with bias input _______________________________________________________________________________________ 7 functional diagram internal supply generator bias uvlo in uvlo control logic p ref error amplifier with soft-start overtemperature protection mos driver with i limit bias in en fb ss out gnd max15030 only max15029 only ref max15029 max15030 detailed description the max15029/max15030 low-dropout linear regula- tors operate from input voltages as low as 1.425v and deliver up to 500ma of continuous output current with a maximum dropout voltage of only 150mv. the max15030 operates with an input voltage as low as 1.425v if the bias voltage (v bias ) of 3v to 5.5v is available. the power is applied at in while the control is provided through bias input. the current drawn by bias is negligible when the ldo goes into the shut- down. this feature is especially useful in automotive applications where the bias input is derived from an always-on ldo that expects to provide minimal power during the key-off condition. the pmos output stage can be driven from input volt- ages down to +1.425v without sacrificing stability or transient performance. the output voltage of all the regulators is adjustable from 0.5v to v in and is ?% accurate over load and line variations, from -40? to +125?. since these regulators have a pmos output device, supply current is not a significant function of load or input headroom.
max15029/max15030 internal p-channel pass transistor the max15029/max15030 feature a 75m (typ) p-channel mosfet pass transistor. unlike similar designs using pnp pass transistors, p-channel mosfets require no base drive, reducing quiescent current. pnp-based regulators also waste considerable current in dropout when the pass transistor saturates and uses high base-drive currents under large loads. the max15029/max15030 do not suffer from these problems and consume only 315? (typ) of quiescent current under heavy loads, as well as in dropout. short-circuit/ thermal fault protection the max15029/max15030 are fully protected from a short circuit at the output through current-limiting and thermal-overload circuitry. in the fault condition when the output is shorted to ground, the output current is limited to a maximum of 1a. under these conditions, the device quickly heats up. when the junction temper- ature reaches +165? (typ), the thermal-overload cir- cuitry turns off the output, allowing the part to cool down. when the junction temperature cools to +150? (typ), the output turns back on and reestablishes regu- lation. current limiting and thermal protection continue until the fault is removed. for continuous operation, do not exceed the absolute maximum junction-tempera- ture rating of t j = +150?. soft-start the max15029/max15030 feature a soft-start function that slowly ramps up the output voltage of the regulator based on the value of the capacitor (c ss ) connected from ss to gnd. upon power-up, c ss is charged with a 5? (typ) current source through ss. the voltage at ss is compared to the internal 0.5v reference (v ref ). the feedback voltage for regulation (v reg ) is the lower of v ss or v ref . as v ss rises, the regulation voltage (v reg ) rises at the same rate. once v ss reaches and rises above v ref , the regulation voltage then tracks the reference voltage since it is the lower of v ss and v ref . the value of c ss determines the length of the soft-start time, t ss . use the following formula to determine c ss . c ss = 10 -5 x t ss where c ss is in farads and t ss is in seconds. shutdown mode the max15029/max15030 include an enable input. to shut down the ic, drive en low. in shutdown mode, the current drawn by bias is less than 2?. this feature is extremely useful in an automotive application where the bias input is derived from an always-on ldo expecting to provide minimal dark current. for normal operation, drive en high or connect en to in for continuous on operation. during shutdown, an internal 10k resistor is connected between out and gnd. applications information programming the output voltage the max15029/max15030 feature an adjustable output voltage from 0.5v to v in using two external resistors connected as a voltage-divider to fb as shown in figure 1. the output voltage is set by the following equation: where typically v fb = 0.5v. choose r2 to be 10k . or, to optimize load-transient response for no load to full load transients, use the resistor-divider as a minimum load and choose r2 to be 500 . to simplify resistor selection: rr v v out fb 12 1 = ? ? ? ? ? ? ? vv r r out fb =+ ? ? ? ? ? ? 1 1 2 1.425v to 3.6v input, 500ma low-dropout regulators with bias input 8 _______________________________________________________________________________________ 0.1uf enable shutdown r2 r1 input 1.425v to 3.6v always-on input 3v to 5.5v output 2.2 f 1 f in bias out fb i.c. gnd en ss max15030 figure 1. max15030 typical application circuit
capacitor selection and regulator stability capacitors are required at the max15029/max15030? inputs and outputs for stable operation over the full temperature range and with load currents up to 500ma. connect a 1? capacitor between in and ground and a 2.2? capacitor with low equivalent series resistance (esr) between out and ground for 500ma output current. the input capacitor (c in ) lowers the source impedance of the input supply. if input supply source impedance is high, place a larger input capacitor close to in to pre- vent v in sagging due to load transients. smaller output capacitors can be used for output currents less than 500ma. calculate the minimum c out as follows: operating region and power dissipation the maximum power dissipation depends on the ther- mal resistance of the ic package and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. the power dissipat- ed in the device is p diss = i out (v in - v out ). the package features an exposed thermal pad on its underside. this pad lowers the thermal resistance of the package by providing a direct heat conduction path from the die to the pcb. additionally, the ground pins (gnd) perform the dual function of providing an electrical connection to system ground and channeling heat away. connect the exposed backside pad and gnd to the system ground using a large pad or ground plane and multiple vias to the ground plane layer. noise, psrr, and transient response the max15029/max15030 are designed to operate with low-dropout voltages and low quiescent currents while still maintaining good noise performance, tran- sient response, and ac rejection (see the typical operating characteristics ). when operating from noisy sources, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques. the max15029/max15030 load-transient response graphs (see the typical operating characteristic s) show two components of the output response: a dc shift from the output impedance due to the load current change, and the transient response. a typical transient overshoot for a step change in the load current from 100ma to 500ma is 10mv. use ceramic output capacitors greater than 2.2? (up to 100?) to attenuate the overshoot. layout guidelines the tdfn package has an exposed thermal pad on its underside. this pad provides a low thermal resistance path for heat transfer into the pcb. this low thermally resistive path carries a majority of the heat away from the ic. the pcb is effectively a heatsink for the ic. the exposed pad should be connected to a large ground plane for proper thermal and electrical performance. the minimum size of the ground plane is dependent upon many system variables. to create an efficient path, the exposed pad should be soldered to a thermal landing, which is connected to the ground plane by thermal vias. the thermal landing should be at least as large as the exposed pad. ci f a out out max = ? ? ? ? ? ? () . 1 025 max15029/max15030 1.425v to 3.6v input, 500ma low-dropout regulators with bias input _______________________________________________________________________________________ 9
max15029/max15030 1.425v to 3.6v input, 500ma low-dropout regulators with bias input 10 ______________________________________________________________________________________ chip information process: bicmos package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. input 1.425v to 3.6v output 0.5v to v in 2.2 f 1 f in out fb gnd en ss max15029 input 1.425v to 3.6v always-on input 3v to 5.5v output 0.5v to v in 2.2 f 1 f in bias out fb gnd en ss max15030 typical operating circuits 1 3 4 10 8 7 out gnd fb in bias i.c. max15030 29 out in 56 ss en tdfn (3mm x 3mm) + ep top view pin configurations (continued) package type package code outline no. land pattern no. 10 tdfn-ep t1033+1 21-0137 90-0003
max15029/max15030 1.425v to 3.6v input, 500ma low-dropout regulators with bias input maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 4/09 initial release 1 2/11 added the max15029 automotive qualified part to the ordering information table; added soldering information to the absolute maximum ratings section; added the package thermal characteristics section; added the land pattern no. to the package information table 1, 2, 10

▲Up To Search▲

Price & Availability of MAX15029ATBV

	To Download MAX15029ATBV Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .