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MAQ5280 25ma, 120v, low i q , high psrr ldo automotive micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 ( 408 ) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com october 2008 m9999-102708-b general description the MAQ5280 is a high performance low dropout regulator, offering a very low noise output with a very wide input voltage operating range, up to 120v dc input voltage. ideal for high input voltage applications such as automotive and telecom, the MAQ5280 offers 2% initial accuracy, extremely high power supply rejection ratio (psrr > 80db) and low ground current (typically 31a). the MAQ5280 can also be put into a zero-off-mode current state, drawing a minus cule amount of current when disabled. the MAQ5280 has a very wide input voltage range, with a dc rating from ?24v to 120v. this wide input range covers the automotive load dump range and the MAQ5280 is optimized for line transient response, making it ideal for harsh environment applications. the MAQ5280 has an operating junction temperature range of ?40c to +125c and is available in an adjustable output voltage version in a lead-free (rohs compliant) 8- pin epad soic packaging. this part is also aec-q100 qualified for automotive applications. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com. features ? wide input voltage range: 4.5v to 120v dc ? very low quiescent current: 31a typical ? 25ma guaranteed output current ? adjustable output from 1.215v to 5v ? dc voltage protection down to -24v ? ability to withstand up to +120v dc at the input ? stable with ceramic output capacitors ? ultra high psrr > 80db for rf applications ? high output accuracy ? 2% initial accuracy ? 3% over temperature (?40c to +125c) ? thermal shutdown and current limit protection ? thermally efficient 8-pin epad soic package ? aec-q100 qualified applications ? automotive systems ? industrial applications ? remote keyless entry power supply ? telecom applications ? off-line power supplies ___________________________________________________________________________________________________________ typical application automotive application
micrel, inc. MAQ5280 october 2008 2 m9999-102708-b ordering information part number voltage temperature range package lead finish MAQ5280yme adj. ?40 to +125c 8-pin epad soic pb-free pin configuration 1 cbyp v out adj gnd 8 vin nc nc en 7 6 5 2 3 4 8-pin epad soic (me) pin description pin number pin name pin function 1 cbyp connect 10f capacitor. increases psrr when vin 6.5v. 2 vout regulator output pin. conne ct 2.2f for better stable operation. 3 adj connect pin 3 to external resistor divider to set vout. 4 gnd ground. 5 en enable pin. enable low turns part off, enable high turns part on. 6, 7 nc not internally connected. 8 vin supply input pin. supply (inp ut): -24v to 120v input voltage. ep ? exposed pad ? connect to ground plane trace.
micrel, inc. MAQ5280 october 2008 3 m9999-102708-b absolute maximum ratings (1) supply voltage (v in ) ..................................... ?24v to +120v enable voltage (v en )...................................... ?1v to +120v power dissipation (p d ) ........................... internally limited (3) max reflow temperature (per ipc/jedec 20c) ..... 260c storage temperature (t s ).........................?65c to +150c esd rating (4) .................................................................. 2kv operating ratings (2) supply voltage (v in )...................................... 4.5v to +120v enable voltage (v en )........................................ 0v to +120v junction temperature (t j ) ........................ ?40c to +125c junction thermal resistance epad soic-8 ( ja )............................................41c/w electrical characteristics (5) v in = 12v; v en = 2v; c out = 2.2f; c byp = 10f; i out = 100a; t j = 25c, bold values indicate ?40c to +125c, unless noted. parameter condition min typ max units variation from nominal v out ?2 +2 % output voltage accuracy variation from nominal v out , ?40c to +125c ?3 +3 % adj pin voltage 1.219 v line regulation (6) v in = 6.5v to 120v ?0.5 0.04 0.5 % load regulation (7) i out = 100a to 25ma ?0.5 0.2 0.5 % i out = 100a; v in = 4.5v; adjust pin = 0v 0 430 700 mv i out = 10ma; v in = 4.5v; adjust pin = 0v 0 800 1000 mv dropout voltage i out = 25ma; v in = 4.5v; adjust pin = 0v 0 1100 1500 mv i out = 100a 0 31 50 a ground pin current i out = 25ma 0 260 400 a v en 0.3v 0 0.02 1 a ground pin current in shutdown v en 0.3v, ?40c to +125c 0 5 a ripple rejection f = up to 1khz 80 db v out = 0v; v in = 4.5v 40 70 ma current limit v out = 0v; v in = 14.4v 70 100 ma i dd reverse battery v in = ?24v; v en = 0.3v 0.4 0.03 50 a i out reverse current v in = 0v; v out = 5v; v en = 0.3v 3 10 a adj pin current 3.3 na output voltage noise 120 v rms enable input logic low 0.3 v enable input voltage logic high 2.0 v v en 0.3v; v in = 12v 0 0.02 1 a v en 2.0v; v in = 12v 0 0.12 1 a enable input current v in = 4.5v; v en = 120v 0 0.15 10 a turn-on time c out = 2.2f; i out = 25ma 0.1 1 ms
micrel, inc. MAQ5280 october 2008 4 m9999-102708-b notes: 1. exceeding the absolute maxi mum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. the maximum allowable power dissipation of any t a (ambient temperature) is p d(max) = (t j(max) ? t a ) / ja . exceeding the maximum allowable power dissipation will result in excessive die temper ature, and the regulator will go into thermal shutdown. 4. devices are esd sensitive. handling precautions recommended. human body model, 1.5k ? in series with 100pf. 5. specification for packaged product only. 6. line regulation is a percentage of v out . 7. regulation is measured at constant junction temperature using low duty cycle pu lse testing; changes in output voltage due t o heating effects are covered by the thermal regulation specification.
micrel, inc. MAQ5280 october 2008 5 m9999-102708-b typical characteristics 0 20 40 60 80 100 120 10 100 1000 10000 100000 frequency (hz) power supply rejection ratio 1ma 100a 25ma 10ma 02 output voltage vs. input voltage 3.145 3.146 3.147 3.148 3.149 3.150 3.151 3.152 3.153 3.154 3.155 0 40 60 80 100 120 input voltage (v) v out = 3.15v c in = 0.18f c out = 2.2f load = 100a 4.990 4.992 4.994 4.996 4.998 5.000 5.002 5.004 5.006 5.008 5.010 0 5 10 15 20 25 load current (ma) output voltage vs. load current en = v byp v in = 12v v out = 5v c in = 0.18f c out = 2.2f 1.215 1.216 1.217 1.218 1.219 1.220 1.221 1.222 1.223 1.224 1.225 feedback voltage vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) load=100a load=25ma 0 50 100 150 200 250 300 0 5 10 15 20 25 output current (ma) ground current vs. output current v in = 12v v out = 5v c in = 0.18f c out = 2.2f 120c ?40c 25c 20 23 26 29 32 35 ground current vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) en = v in load = 100a v in =120v v in =12v v in =4.5v 0 0.2 0.4 0.6 0.8 1.2 1.4 0 5 10 15 20 25 output current (ma) 1.0 dropout voltage vs. output current v in = 4.5v c in = 0.18f c out = 2.2f 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 dropout voltage vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) load=100a load=10ma load=25ma 55 58 61 64 67 70 73 76 79 0 20 40 60 80 100 120 input voltage (v) v out = 3.15v c out = 2.2f current limit vs. input voltage 50 53 56 59 62 65 68 71 74 77 80 -40 -20 0 20 40 60 80 100 120 temperature (c) v in =4.5v v in =12v current limit vs. temperature 3.10 3.13 3.16 3.19 3.22 3.25 3.28 3.31 3.34 3.37 3.40 adjust pin current vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) v en = 12v 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 enable threshold vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) load = 100a
micrel, inc. MAQ5280 october 2008 6 m9999-102708-b typical characteristics (continued) 0 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0 20 40 60 80 100 120 enable voltage (v) enable current vs. enable voltage v in = 12v 0.115 0.117 0.119 0.121 0.123 0.125 0.127 0.129 0.131 0.133 0.135 enable current vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) v in =12v v in =120v 0 0.5 1.5 2.5 3.5 4.5 5.5 6.5 1.5 2.5 3.5 4.5 5.5 6.5 input voltage (v) low voltage behavior load=100a load=10ma v out = 5v c out = 2.2f 0 10 20 30 40 50 60 70 0 24487296120 input voltage (v) v in current vs. input voltage v out = 1.2v c in = 0.18f c out = 2.2f i out = 0a 0.01 0.1 1 10 output noise spectral density 100 frequency (hz) 10 1k 10k 1m 100k v in = 3.6v v out = 3.3v c out = 2.2f c byp = 0.1f load = 25ma noise(10hz to 100khz)=113v rms
micrel, inc. MAQ5280 october 2008 7 m9999-102708-b functional characteristics
micrel, inc. MAQ5280 october 2008 8 m9999-102708-b functional diagram enable en en < en en > en > vin en > gnd cbyp vout adj en > 1.22v 1.2v + bypass regulator post regulator
micrel, inc. MAQ5280 october 2008 9 m9999-102708-b functional description MAQ5280 is a high performance linear regulator which accepts wide input operating range 4.5v to 120v. this allows the use in harsh environments. the input can surge from 0v to 120v within a millisecond. the first stage bypass regulator isolates output from this input by producing an intermediate head voltage which is a input- to-post regulator. this post regulator gives the control to regulate the required output voltage. the output voltage is adjustable from 1.22v to 5v. vin pin v in pin is the supply input pin. a 0.18f or larger capacitor with proper voltage rating is recommended for filtering the input voltage variations and noise on the input voltage. this capacitor should be close to the v in and gnd pins. cbyp pin the bypass pin is the output of the bypass regulator and the input of the post regulator. by connecting a capacitor from the c byp pin-to-gnd, a greater stability and a much higher psrr is achieved. a 10f ceramic capacitor is recommended and this significantly decreases v out noise and perturbations due to line transients. when the MAQ5280 is enabled, the bypass pin voltage is regulated at 5.5v. to maintain 5.5v regulation and high psrr, the v in must be no lower than 6.5v. for v in less than 6.5v while in dropout, the psrr is reduced. en pin en pin is a logic level enable input which turns MAQ5280 on/off. drive en pin level high to turn the device on and drive en pin low to keep the device in shutdown mode. in shutdown mode the MAQ5280 draws typically 20na from the input supply. en pin can withstand 120v, allowing en always connected to input supply for always-on operation. adj pin adj pin gives the flexibility to set the output voltage to the requirement from 1.22v to 5v. use a resistor divider from output and connect to adj pin, internal reference is typically 1.219v. gnd pin this gnd pin provides the ground for all the electrical connections. MAQ5280 has exposed pad underneath the package which should be connected to ground. if this exposed pad is connected to wide ground plane it would improve the thermal performance of MAQ5280. nc pins there are two nc pins on the package which are not connected internally. vout pin the v out pin is the regulated output of the post regulator. when the MAQ5280 is enabled, v out regulates at a fixed voltage, when disabled, v out is high impedance. a 2.2f or larger ceramic capacitor must be connected to v out pin-to-ground.
micrel, inc. MAQ5280 october 2008 10 m9999-102708-b application information MAQ5280 is a linear regulator with a wide operating range of input voltage 4.5v to 120v. the input can go down to ?24v without any damage to the device. this feature gives the advantage to use in harsh environment applications such as automotive load dump and remote keyless entry as well as telecom applications. thermal protection MAQ5280 has internal thermal shutdown to protect from over dissipation and failure. when the junction temperature exceeds +160c, an internal thermal sensor signals the shutdown logic to turn off the pass transistor and allows the ic to cool. the thermal sensor turns the pass transistor on again after the junction temperature cools by 10c. this results in a cycled output during continuous thermal overload conditions. the recovery from thermal shutdown is smooth without any overshoot. for continuous operation, do not exceed the maximum junction temperature rating of +125c. current limit MAQ5280 has a current limit protection to protect it from over loads. the recovery from current limit protection is smooth without any oversh oots. the output can be shorted to gnd for an indefinite period of time without damage to the device. during a short circuit, the power dissipated across the pass transistor can quickly heat the device. when the die temperature reaches +160c, the MAQ5280 shut down and automatically restart after the die temperature cools by 10c. this results in a pulsed output operation. cbyp output when enable is low when the enable is low and the MAQ5280 is disabled, while v in voltage is present, the cbyp pin voltage is typically 4.5v, even for v in as high as 120v. the bypass regulator although maintaining the bypass voltage, requires no current from v in other than leakage current. bypass capacitor a 10f capacitor should be connected from bypass pin to ground to maintain stability of the bypass regulator. the voltage rating of the capacitor must be 8v or higher. low esr ceramic capacitors work well. although a 1f capacitor maintains good ac power supply rejection, higher capacitance values w ill enhance ac power supply rejection. psrr power supply rejection ratio is the measure of a v out signal caused by a signal on the v in pin. the ratio of v in /v out in db is psrr. the MAQ5280?s psrr from 0hz to 1khz exceeds 80db. output voltage setting for adjustable regulator, v out is programmable from 1.22v to 5.0v. a 2.2f or larger capacitor must be connected to v out pin-to-ground to maintain stability. this capacitor value can be increased without bound. the v out capacitor can have an esr of 0 ? . when v in is lower than v out , v out is not pulled low by v in . a small current, typically 4a, will sink into v out pin. the output voltage is controlled by the feedback resistors (r1 and r2) and can be calculated as follows: ? ? ? ? ? ? + ? = 1 2 1 r r v v ref out v ref = 1.219v the evaluation board is initially adjusted to 5v, but can easily be modified by removing r1 and replacing it with the value that yields the desired output voltage. ? ? ? ? ? ? ? ? ? ? = 1 2 1 ref out v v r r ensure the output voltage selected does not exceed 5v. enable pin the voltage on enable pin en of MAQ5280 could vary from ?1v to 120v. so enable pin en of MAQ5280 can be used in a different configuration as the application dictates. if the MAQ5280 needs to be always enabled then simply connect the en pin to cbyp pin, as shown in figure 1. then whenever v in has a supply voltage output is developed. input can swing from ?24v to 120v. one can also connect en pin through 100k ? resistor to input as shown in figure 2 to achieve the same result.
micrel, inc. MAQ5280 october 2008 11 m9999-102708-b figure 1. MAQ5280 en always enabled figure 2. enable connected to v in application
micrel, inc. MAQ5280 october 2008 12 m9999-102708-b bill of materials item part number manufacturer description qty. nmc-p1210x7r184k200trplpf nic (1) capacitor, 0.18f, 200v, size 1210 c1812c184k2rac kemet (2) c1 vj1812y184kxc vishay (3) capacitor, 0.18f, 200v, size 1812 1 c1608x5r1a225k tdk (4) capacitor, 2.2f,10v, x5r, size 0603 0603c225mat avx (5) capacitor, 2.2f,6.3v, x7r, size 0603 c2 grm188r60j225ke19d murata (6) capacitor, 2.2f,6.3v, x5r, size 0603 1 c1608x5r0j105k tdk (4) vj0603g105kxypw1bc vishay (3) c3 grm188r60j105ka01d murata (6) capacitor, 1f,6.3v, x5r, size 0603 1 r1 crcw060315r4fkeye3 vishay (3) resistor, 15.4k, 1%, 1/16w, size 0603 1 r2 crcw06034r87fkeye3 vishay (3) resistor, 4.8k, 1%, 1/16w, size 0603 1 u1 MAQ5280yme micrel, inc. (7) 25ma, 120v, low i q , high psrr ldo 1 notes: 1. nic: www.nic.com 2. kemet electronics: www.ketem.com 3. vishay: www.vishay.com 4. tdk: www.tdk.com 5. avx: www.avx.com 6. murata: www.murata.com 7. micrel, inc.: www.micrel.com
micrel, inc. MAQ5280 october 2008 13 m9999-102708-b pcb layout recommendations top layer bottom layer
micrel, inc. MAQ5280 october 2008 14 m9999-102708-b package information 8-pin epad soic (me) micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web http://www.micrel.com the information furnished by micrel in this data sheet is belie ved to be accurate and reliable. however, no responsibility is a ssumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authori zed for use as components in life support app liances, devices or systems where malfu nction of a product can reasonably be expected to result in pers onal injury. life support devices or system s are devices or systems that (a) are in tended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significan t injury to the user. a purchaser?s use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchaser?s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2008 micrel, incorporated.

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