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mic5315 low voltage dual 300ma ldo with voltage select mlf and micr oleadframe are registered trademarks of amkor technology, inc. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 ( 408 ) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com july 2008 m9999-070208-a general description the mic5315 is a high performance, dual low input voltage, low dropout regulator with voltage select. major features include two 300ma ldos, input voltage down to 1.7v, ultra low drop out of 85mv at full load, and voltage select. each ldo has its own low voltage input for system flexibility. the low input voltages and low drop out operation provides high efficien cy by reducing the input to output voltage step which mi nimizes the regulator power loss. voltage select is incorporated into the second output, which reduces the output voltage to a lower level to further save power while in stand-by mode. ideal for battery operated applic ations; the mic5315 offers 1% accuracy and low ground curr ent to increase light load efficiency. the mic5315 can also be put into a zero-off- mode current state, drawing virtually no current when disabled. the mic5315 is available in fixed output voltages in the 10-pin 2mm x 2mm thin mlf ? leadless package. data sheets and support doc umentation can be found on micrel?s web site at: www.micrel.com. features ? 300ma output current for each ldo ? dual low voltage regulator inputs: 1.7v to 5.5v ? low output voltage range: 0.8v to 2.0v ? ultra-low dropout voltage of 85mv @ 300ma ? voltage select function ? stable with 1f ceramic output capacitors ? very fast transient response ? thermal shutdown and current limit protection ? tiny 10-pin 2mm x 2mm thin mlf ? package applications ? mobile phones ? gps and navigation devices ? portable media players ? digital still an d video cameras ? pdas ? portable electronics ___________________________________________________________________________________________________________ typical application vbat cbias 1f vin1 cbyp vin2 en2 vbias en1 vout2 vout1 mic5315-xxyymt gnd 10nf 1f 1f cin 1f mic23031-1.8ymt dc-to-dc converter vi/o vcore1 vcore2 processor /vsc2
micrel, inc. mic5315 july 2008 2 m9999-070208-a ordering information part number manufacturing part number marking (1) vout1 (2) vout2 (2) junction temp. range package (3) mic5315-1.5/1.2/1.0ymt mic5315-f4cymt f4c 1.5v 1.2v/1.0v ?40c to +125c 10-pin 2mm x 2mm thin mlf ? mic5315-1.5/1.3/1.0ymt mic5315-f5cymt f5c 1.5v 1.3v/1.0v ?40c to +125c 10-pin 2mm x 2mm thin mlf ? mic5315-1.8/1.6/1.1ymt mic5315-gw3ymt gw3 1.8v 1.6v/1.1v ?40c to +125c 10-pin 2mm x 2mm thin mlf ? mic5315-1.8/1.8/1.0ymt mic5315-ggcym t ggc 1.8v 1.8v/1.0v ?40c to +125c 10-pin 2mm x 2mm thin mlf ? notes: 1. pin 1 identifier = . 2. for other voltage option, cont act micrel marketing for details 3. mlf ? is a green rohs compliant package. lead fini sh is nipdau. mold compound is halogen free. pin configuration en2 gnd 5 1 vin1 vin2 v bias en1 10 vout1 vout2 /vsc2 cbyp 9 8 7 2 3 4 6 10-pin 2mm 2mm thin mlf ? (mt) pin description pin number pin name pin function 1 vin1 voltage input for ldo1. 2 vin2 voltage input for ldo2. 3 vbias bias input voltage. 4 en1 enable input for ldo1. ac tive high input. logic high = on; logic low = off; do not leave floating. 5 en2 enable input for ldo2. ac tive high input. logic high = on; logic low = off; do not leave floating. 6 gnd ground. 7 cbyp bypass: connect a capacitor to groun d to improve output noise and psrr. 8 /vsc2 voltage select input for ldo2. active low input. logic high = full output voltage; logic low = low output vo ltage. do not leave floating. 9 vout2 output of regulator 2. 10 vout1 output of regulator 1.
micrel, inc. mic5315 july 2008 3 m9999-070208-a absolute maximum ratings (1) main input voltage (v in1 , v in2 )..........................0v to v bias bias supply voltage (v bias )...............................0v to +6v enable input voltage (v en1 , v en2 ) ....................0v to v bias voltage select input voltage (v /vsc2 ) ...............0v to v bias power dissipation ...............................in ternally limited (3) lead temperature (solde ring, 3sec .) ......................260c storage temperature (t s ) ..................... ?65c to +150c esd rating (4) ...............................................................2kv operating ratings (2) supply voltage (v in1 , v in2 )...........................+1.7v to v bias bias supply voltage (v bias ) ........................ 2.5v to +5.5v enable input voltage (v en1 , v en2 ) ................... 0v to v bias voltage select input voltage (v /vsc2 )............... 0v to v bias junction temperature (t j ) .....................?40c to +125c junction thermal resistance 2mm x 2mm thin mlf-10 ( ja ).............................80c/w electrical characteristics (4) v bias = 3.6v; v in1 = v in2 = v out (highest of two regulators) + 1v; c bias =c out = 1.0f, c byp =0.01f, i out = 100a; t j = 25oc, bold values indicate ?40oc to + 125oc; unless noted. parameter condition min typ max units variation from nominal v out1 & v out2 ?1.0 +1.0 % output voltage accuracy variation from nominal v out1 & v out2 ? 2.0 +2.0 % v out2 , v /vsc2 = logic low -3.0 +3.0 % select mode output voltage accuracy v out2 , v /vsc2 = logic low -4.0 +4.0 % v in line regulation v in = v out +1v to 5.5v, v bias = 5.5v 0.02 0.3 %/v v bias line regulation v bias = 3.6v to 5.5v, v in = v out +1v 0.02 0.3 %/v load regulation i out = 100a to 300ma 0.4 1.0 % dropout voltage i out = 150ma i out = 300ma 40 85 100 200 mv mv ground pin current v in1 ,v in2 v en1 = high; v en2 = low; i out1 = 100a to 300ma v en1 = low; v en2 = high; i out2 = 100a to 300ma 7 7 12 12 a a ground pin current v bias i out1 = i out2 = 100a to 300ma 30 46 a ground pin current in shutdown v en 0.2v 0.01 1.0 a v in ripple rejection f = 1khz; c out = 1.0f; c byp = 0.01f f = 20khz; c out = 1.0f; c byp = 0.01f 65 40 db db current limit v out = 0v 350 550 ma output voltage noise c out =1f, c byp =0.01f, 10hz to 100khz 30 v rms enable logic low 0.2 v enable input voltage logic high 1.2 v v il 0.2v 0.02 1 a enable input current v ih 1.2v 0.2 1 a turn-on time c out = 1f; c byp = 0.01f 150 300 s
micrel, inc. mic5315 july 2008 4 m9999-070208-a notes: 1. exceeding the absolute maximum 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 temperatur e, and the regulator will go into thermal shutdown. 4. devices are esd sensitive. handling pr ecautions recommended. human body model, 1.5k ? in series with 100pf. 5. specification for packaged product only.
micrel, inc. mic5315 july 2008 5 m9999-070208-a typical characteristics 0 power supply rejection ratio (v in ) 100 frequency (hz) 10 1k 10k 1m 300ma 150ma 100k v in = v out +1v v out = 1.8v c out = 1f c byp = 10nf 0 power supply rejection ratio (v bias ) 100 frequency (hz) 10 1k 10k 1m v in = v out +1v v out = 1.8v c out = 1f c byp = 10nf 300ma 150ma 100k 10 11 12 13 14 15 16 ground current (v in ) vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) v in = v out +1v v bias = 3.6v v out1 = 1.5v v out2 = 1.2v c out = 1f c byp = 10nf i out1 = i out2 = 300ma 0 50 100 150 200 250 300 output current (ma) 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 ground current (v in ) vs. output current v in = v out +1v v bias = 3.6v v out1 = 1.5v v out2 = 1.2v c out = 1f c byp = 10nf 24 25 26 27 28 29 30 0 50 100 150 200 250 300 output current (ma) ground current (v bias ) vs. output current v in = v out +1v v bias = 3.6v v out1 = 1.5v v out2 = 1.2v c out = 1f c byp = 10nf 12 13 14 15 16 1.5 2.5 3.5 4.5 5.5 input voltage (v) 2.0 3.0 4.0 5.0 ground current (v in ) vs. input voltage v bias = 3.6v v out1 = 1.5v v out2 = 1.2v c out = 1f c byp = 10nf 300ma 10ma 0 20 40 60 80 100 120 dropout voltage vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) v out = 1.5v c out = 1f 300ma 10ma 150ma 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0 50 100 150 200 250 300 load current (ma) dropout voltage vs. load current v bias = 3.6v v out = 1.8v c out = 1f 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 output voltage vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) v in = v out +1v v bias = 3.6v en = v in v out = 1.5v c out = 1f 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 0 50 100 150 200 250 300 output current (ma) output voltage vs. output current v in = v out +1v v bias = 3.6v v out = 1.5v c out = 1f 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 input voltage (v) output voltage vs. input voltage v bias = 5.5v i out = 10ma c out1 = 1f c out2 = 1f 1.8v 1.1v 450 470 490 510 530 550 570 590 610 630 650 1.5 2 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) current limit vs. input voltage v bias = 5.5v v out = 1.5v c out = 1f
micrel, inc. mic5315 july 2008 6 m9999-070208-a typical characteristics (continued) 0.001 0.01 0.1 1 output noise spectral density 100 frequency (hz) 10 1k 10k 1m 100k c out = 1f c byp = 10nf
micrel, inc. mic5315 july 2008 7 m9999-070208-a functional characteristics
micrel, inc. mic5315 july 2008 8 m9999-070208-a functional diagram en1 vin1 vbias gnd vout1 vout2 ldo1 thermal limit quick start reference current limit en2 vin2 ldo2 cbyp /vsc2 mic5315 block diagram
micrel, inc. mic5315 july 2008 9 m9999-070208-a application information the mic5315 is a high performance, dual low input voltage, ultra-low dropout regulator designed for low applications requiring very fast transient response. the mic5315 utilizes tw o input supplies (v in and v bias ), significantly reducing the dropout voltage. the mic5315 regulator is fu lly protected from damage due to fault conditions, offeri ng linear current limiting and thermal shutdown. bias supply voltage v bias , requiring relatively light current, provides power to the control portion of th e mic5315. bypassing on the bias pin is recommended to improve performance of the regulator during line and load transients. a 1f ceramic capacitor from v bias -to-ground is recommended to help reduce the high frequency noise from being injected into the control circuitry. input supply voltage v in1 and v in2 , provide the supply to power the ldos independently. the minimum input voltage is 1.7v allowing conversion from low voltage supplies. the low input voltage provides high efficiency by reducing the input to output voltage step which minimizes the regulator power loss. input capacitor the mic5315 is a high-performance, high bandwidth device. therefore, it requ ires a well-bypassed input supply for optimal performance. a 1f capacitor is required from the input-to-g round to provide stability. low-esr ceramic capacitors provide optimal performance at a minimum of space. additional high- frequency capacitors, such as small-valued npo dielectric-type capacitors, help filter out high-frequency noise and are good practice in any rf-based circuit. x5r or x7r dielectrics are recommended for the input capacitor. y5v dielectrics lose most of their capacitance over temperature and are therefore, not recommended. output capacitor the mic5315 requires an output capacitor of 1f or greater to maintain stability. the design is optimized for use with low-esr ceramic chip capacitors. high esr capacitors may cause high frequency oscillation. the output capacitor can be incr eased, but performance has been optimized for a 1f ceramic output capacitor and does not improve significantly with larger capacitance. x7r/x5r dielectric-type ceramic capacitors are recommended because of their temperature performance. x7r-type capacitors change capacitance by 15% over their operat ing temperature range and are the most stable type of ceramic capacitors. z5u and y5v dielectric capacitors change value by as much as 50% and 60%, respectively, over their operating temperature ranges. to use a ceramic chip capacitor with y5v dielectric, the value must be much higher than an x7r ceramic capacitor to ensure the same minimum capacitance over the equiva lent operating temperature range. bypass capacitor a capacitor can be placed from the bypass pin-to-ground to reduce the output voltage noise. the capacitor bypasses the internal referenc e. a 0.01f capacitor is recommended for applications that require low-noise outputs. the bypass capacitor can be increased, further reducing noise and improving psrr. turn-on time increases slightly with respect to the bypass capacitance. a unique, quick-start circuit allows the mic5315 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. no-load stability unlike many other voltage regulators, the mic5315 will remain stable and in regulation with no load. this is especially important in cmos ram keep-alive applications. enable/shutdown the mic5315 is provided with dual active-high enable pins that allow each regulator to be disabled independently. forcing the enable pin low disables the regulator and sends it into a ?zero? off-mode-current state. in this state, current consumed by the regulator goes nearly to zero. forcing the enable pin high enables the output voltage. the active-high enable pin uses cmos technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate stat e on the output. voltage select the mic5315 incorporates voltage select technology to set ldo2?s voltage output to a preset lower level. the /vsc2 pin is an active low input. a logic high signal sets v out2 to the full output voltage; while a logic low signal sets v out2 to the lower output voltage. thermal considerations the mic5315 is designed to provide 300ma of continuous current for both outputs in a very small package. maximum ambient operating temperature can be calculated based upon the output current and the voltage drop across the part. given that the input voltage is 1.8v, the output voltage is 1.5v for v out1 , 1.0v for v out2 and the output current = 300ma for each output. the actual power dissipation of the regulator circuit can be determined using the equation: p d = (v in ? v out1 ) i out1 + (v in ? v out2 ) i out2 + v bias i gnd because this device is cmos and the ground current is
micrel, inc. mic5315 july 2008 10 m9999-070208-a typically <100a over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. p d = (1.8v ? 1.5v) 300ma + (1.8v ? 1.0v) 300ma p d = 0.33w to determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation: ? ? ? ? ? ? ? ? ? = ja a j(max) d(max) t t p t j(max) = 125c, the maximum junction temperature of the die. the junction-to-ambi ent thermal resistance for the minimum footprint, is ja = 80c/w. substituting p d for p d(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. the maximum power dissipation must not be exceeded for proper operation. for example, when operating the mic5315-f5cymt at an input voltage of 1.8v and 300ma, loads at each output with a minimum footprint layout, the maximum ambient operating temperature t a can be determined as follows: 0.33w = (125c ? t a )/(80c/w) t a = 98.6c for a full discussion of heat sinking and thermal effects on voltage regulators, refer to the ?regulator thermals? section of micrel?s designing with low-dropout voltage regulators handbook. this information can be found on micrel's website at: http://www.micrel.com/_pdf/other/ldobk_ds.pdf
micrel, inc. mic5315 july 2008 11 m9999-070208-a mic5315 typical a pplication circuit j1 vin c3 10nf vin1 1 /vsc2 8 vin2 2 en2 6 vbias 3 en1 5 vout2 9 vout1 10 u 1 mic5315-xxyymt gnd 4 j3 v bias j4 en1 j5 en2 j2 gnd c5 1f c4 1f j7 vo1 j8 vo2 j9 gnd cbyp 7 c2 1f c1 1f vin j10 vsc bill of materials item part number manufacturer description qty c1, c2, c4, c5 c1608x5r1a105k tdk (1) capacitor, 1f ceramic, 10v, x5r, size 0603 4 c3 vj0603y103kxacw1bc vishay (2) capacitor, 0.01f, 50v, x7r, size 0603 1 u1 mic5315-xxyymt micrel (3) low voltage dual 300ma ldo with v scale 1 notes: 1. tdk: www.tdk.com 2. vishay: www.vishay.com 3. micrel, inc.: www.micrel.com
micrel, inc. mic5315 july 2008 12 m9999-070208-a pcb layout recommendations top layer bottom layer
micrel, inc. mic5315 july 2008 13 m9999-070208-a package information 10-pin 2mm 2mm thin mlf ? (mt) 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 appl iances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. life suppo rt devices or systems 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 products for use in life support appliances, 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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