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mic2215 triple high psrr, low noise cap ldo mlf and micro leadframe 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 january 2007 1 m9999-011207 general description the mic2215 is a high performance, triple ldo voltage regulator, with each regulator capable of providing 250ma continuous output current. ideal for battery operated applic ations, the mic2215 offers 1% initial accuracy, extremely low dropout voltage (100mv @ 150ma), and low ground current at light load (typically 110a per regulator). equipped with a noise bypass pin and featuring very high power supply ripple rejection (psrr) of up to 80db, the mic2215 provides the lowest noise and highest efficiency solution for rf applications in portable electronics such as cellular phones and wireless lan applications. equipped with ttl logic-compatible enable pins, each of the regulators in the mic2215 can be put into a zero current off mode where the supply current is much less than 1a when all the regulators are disabled. the mic2215 is a cap design, which enables a stable output with small ceramic output capacitors, reducing both cost and required board space fo r output bypassing. the mic2215 is available in the miniature 16-pin, (4mm4mm) mlf ? package. data sheets and support doc umentation can be found on micrel?s web site at www.micrel.com. features ? input voltage range: +2.25v to +5.5v ? 70db psrr ? stable with ceramic output capacitor ? high output accuracy: ? 1.0% initial accuracy ? 2.0% over temperature ? low dropout voltage of 100mv@150ma ? low quiescent current:110a per regulator ? fast turn-on time:30s ? zero off-mode current ? thermal shutdown protection ? current-limit protection ? tiny 16-pin (4mm 4mm) mlf ? package applications ? cellular phones ? pcs and peripherals ? wireless lan cards ? pdas ? gps ___________________________________________________________________________________________________________ typical application vin1 vin2 vin3 vout3 en1 en2 en3 c out = 1f ceramic c in = 1f ceramic cbyp vout1 vout2 gnd mic2215-xxx_ml off on off on off on rx chain tx chain synth/tcxo/vco
micrel, inc. mic2215 january 2007 2 m9999-011207 ordering information part number part number standard pb-free voltage (1) (v o 1/v o 2/v o 3) junction temp. range package MIC2215-MMMBML mic2215-mmmyml 2.8v/2.8v/2. 8v ?40 to +125c 16-pin 4mm x 4mm mlf ? mic2215-pmmbml mic2215-pmmyml 3.0v/2.8v/ 2.8v ?40 to +125c 16-pin 4mm x 4mm mlf ? mic2215-ppgbml mic2215-ppgyml 3.0v/3.0v/1. 8v ?40 to +125c 16-pin 4mm x 4mm mlf ? mic2215-ppmbml mic2215-ppmym l 3.0v/3.0v/2.8v ?40 to +125c 16-pin 4mm x 4mm mlf ? mic2215-pppbml mic2215-pppyml 3.0v/3.0v/3. 0v ?40 to +125c 16-pin 4mm x 4mm mlf ? mic2215-aaabml mic2215-aaayml adj./adj./adj. ?40 to +125c 16-pin 4mm x 4mm mlf ? note: for other voltage options, contact micrel for details. voltage code adj. a 1.5 f 1.6 w 1.8 g 1.85 d 1.9 y 2.0 h 2.1 e 2.5 j 2.6 k 2.65 i 2.7 l 2.8 m 2.85 n 2.9 o 3.0 p 3.1 q 3.2 r 3.3 s 3.4 t 3.5 u 3.6 v table 1. voltage codes
micrel, inc. mic2215 january 2007 3 m9999-011207 pin configuration out1 vin1 vin2 out2 vin3 gnd gnd byp out3 out3 nc out1 en3 en2 en1 out2 out1 vin1 vin2 out2 vin3 gnd gnd byp out3 adj3 adj1 out1 en3 en2 en1 a dj2 mic2215-xxx_ml (ml) (fixed) mic2215-aaa_ml (ml) (adjustable) pin description pin number pin name pin function 1 vout1 output voltage of regulator 1 ( 250ma). connect externally to pin 16. 2 vin1 supply input of regulator 1 (highes t input voltage required for common circuitry). 3 vin2 supply input of regulator 2. 4 vout2 output voltage of regulator 2 (250ma). for fixed output device, connect pins 4 and 5 externally. vout2 (fixed) output voltage of regulator 2 (250ma). for fixed output device, connect pins 4 and 5 externally. 5 adj2 (adj.) adjust input. feedback input for regulator 2. 6 en1 enable input to regulator 1. enables regulator 1 output. active high input. high = on, low = off. 7 en2 enable input to regulator 2. enables regulator 2 output. active high input. high = on, low = off. 8 en3 enable input to regulator 3. enables regulator 3 output. active high input. high = on, low = off. 9 cbyp reference bypass: connect external 0.01f to gnd to reduce output noise. may be left open. 10 gnd ground. 11 gnd ground. 12 vin3 supply input of regulator 3. 13 vout3 output voltage of regulator 3 (250ma). for fixed output device, connect pins 13 and 14 externally. vout3 (fixed) output voltage of regulator 3 (250ma). for fixed output device, connect pins 13 and 14 externally. 14 adj3 (adj.) adjust input. feedback input for regulator 3. nc (fixed) no connect. not internally connected. 15 adj1 (adj.) adjust input. feedback input for regulator 1. 16 vout1 output voltage of regulator 1 (250ma). connect externally to pin 1. exposed pad gnd ground.
micrel, inc. mic2215 january 2007 4 m9999-011207 absolute maximum ratings (1) supply voltage (v in ) ............................................... 0v to 7v enable voltage (v en ).............................................. 0v to 7v power dissipation (p d ) ........................... internally limited (3) junction temperature (t j ) ........................?40c to +125c storage temperature (t s ) .........................?65c to +150c lead temperature (solde ring, 5 se c.) ........................ 260c esd rating (4) operating ratings (2) supply voltage (v in1 ) ........................................................ 2.25v to 5.5v (v in2 , v in3 ) ..................................................2.25v to v in1 enable voltage (v en ).............................................0v to v in1 junction temperature (t j ) ........................ ?40c to +125c package thermal resistance 4x4 mlf-16 ( ja ) ...............................................45c/w electrical characteristics (5) v in1 = v in2 = v in3 = v out (highest nominal) +1.0v; c out = 1.0f, i out = 100a; t j = 25c, bold values indicate ?40c to + 125c; unless noted. parameter condition min typ max units output voltage accuracy ?1 ?2 +1 +2 % % output voltage temp. coefficient 40 ppm/c line regulation v in = v out +1v to 5.5v 0.015 0.3 %/v load regulation i out = 100a to 250ma 0.3 0.5 % i out = 100a 2 mv i out = 50ma 32 mv i out = 100ma 63 mv i out = 150ma 100 150 mv dropout voltage i out = 250ma 170 275 mv i out1 = i out2 = i out3 = 100a 280 400 a i out1 = 100a; i out2 /i out3 = off 110 150 a ground current i out1 = i out2 = i out3 = 250ma 420 550 a quiescent current v en1 = v en2 = v en3 = 0v 0.2 1 a v in = v out +1.0v; i out = 150ma, f = 0.1khz to 1khz, c byp = 0.1f 70 db v in = v out +0.4v; i out = 150ma, f = 0.1khz to 1khz, c byp = 0.1f 60 db ripple rejection v in = v out +0.2v, i out = 150ma, f = 0.1khz to 1khz, c byp = 0.1f 45 db current limit v out = 0v (all regulators) 350 700 ma output voltage noise c byp = 0.1f, f = 10hz to 100khz 30 v rms turn-on time c byp = 0.01f 30 100 s enable input logic low (regulator shutdown) 0.4 v enable input voltage logic high (regulator enabled) 1.5 v v il < 0.4v (regulator shutdown) 1.0 a enable input current v ih > 1.5v (regulator enabled) 0.01 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 temper ature, and the regulator will go into thermal shutdown. 4. devices are esd sensitive. handling precautions recommended. 5. specification for packaged product only.
micrel, inc. mic2215 january 2007 5 m9999-011207 typical characteristics ta = +25c, unless otherwise noted
micrel, inc. mic2215 january 2007 6 m9999-011207 typical characteristics (cont.)
micrel, inc. mic2215 january 2007 7 m9999-011207 typical characteristics (cont.)
micrel, inc. mic2215 january 2007 8 m9999-011207 functional diagram vin1 current limit en1 error amp vin2 current limit en2 error amp vin3 current limit en3 error amp quick- start v ref gnd vout1 vout2 vout3 byp thermal limit adj1 adj2 adj3 vin1 current limit en1 error amp vin2 current limit en2 error amp vin3 current limit en3 error amp quick- start v ref gnd vout1 vout2 vout3 byp thermal limit mic2215 block diagram (adjustable) mic2215 block diagram (fixed) functional description the mic2215 is a triple, low noise cmos ldo. designed specifically for noise-critical applications in handheld or battery-powered devices, the mic2215 comes equipped with a noise reduction feature to filter the output noise via an external capacitor. other features of the mic2215 include a se parate logic compatible enable pin for each channel, current limit, thermal shutdown, and ultra-fast transient response, all within a small mlf ? package. the mic2215 is specifically designed to work with low- esr ceramic capacitors, reducing the amount of board space necessary for power applications, which is critical in hand-held wireless devices.
micrel, inc. mic2215 january 2007 9 m9999-011207 application information enable/shutdown the mic2215 comes with three active-high enable pins that allow control of each individual regulator to be either disabled or enabled. forcing the enable pin low disables the respective regulator and sends it into a ?zero? off- mode-current state. in this state, current consumed by the individual regulator goes nearly to zero. this is true for both regulators 2 and 3. regulator 1?s input supply pin is also used to power the internal reference. when any regulator; either 1, 2, or 3 is enabled, an additional 20a for the reference will be drawn through v in1 . all three must be disabled to enter the ?zero? current-off- mode-state. forcing the enable pin high enables each respective output voltage. this part is cmos and none of the enable pins can be le ft floating; a floating enable pin may cause an indeterminate state on the output. input capacitor the mic2215 is a high performance, high bandwidth device. therefore, it requ ires a well-bypassed input supply for optimal performance. a small 0.1f capacitor placed close to the input is recommended to aid in noise performance. low-esr ceramic capacitors provide opti- mal performance at a mini-m um of space. additional high-frequency capacitors such as small valued npo dielectric type capacitors help to filter out high frequency noise and are good practice in any rf-based circuit. output capacitor the mic2215 require s an output capacitor for stability. the design requires 1f or greater on the output to maintain stability. the design is optimized for use with low-esr ceramic chip capacitors. x7r/x5r dielectric- type ceramic capacitors are recommended because of their temperature perform ance. x7r-type capacitors change capacitance by 15% over their operating temp- erature range and are the mo st 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 equivalent operating temperature range. bypass pin a capacitor can be placed from the noise bypass pin to ground to reduce output voltage noise. the capacitor bypasses the internal reference. there is one single internal reference shared by each output, therefore the bypassing affects each regul ator. a 0.1f 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 bypass capacitance. internal reference the internal band gap, or reference, is powered from the v in1 input. due to some of the input noise (psrr) contributions being imposed on the band gap, it is important to make v in1 as clean as possible with good bypassing close to the input. multiple input supplies the mic2215 can be used with multiple input supplies when desired. the only requirement, aside from maintaining the voltages within the operating ranges, is that v in1 always remains the highest voltage potential. no-load stability the mic2215 will remain stable and in regulation with no load, unlike many other vo ltage regulators. this is especially important in cmos ram keep-alive app- lications. thermal considerations the mic2215 is designed to provide up to 250ma of current per channel in a very small package. maximum power dissipation can be calc ulated based on the output current and the voltage drop across the part. to determine the maximum power dissipation of the package, use the junction-to- ambient thermal resistance of the device and the fo llowing basic equation: p d(max) = (t j(max) ? t a ) ja t j(max) is the maximum junction temperature of the die, 125c, and t a is the ambient operating temperature. ja is layout dependent; table 2 shows examples of the junction-to-ambient thermal re sistance for the mic2215. package ja recommended minimum footprint 16-pin 4mm x 4mm mlf ? 43c/w table 2. mlf ? thermal resistance the actual power dissipation of the regulator circuit can be determined using the equation: p dtotal = p dldo1 + p dldo2 + p dldo3 p dldo1 = (v in1 ? v out1 ) i out1 p dldo2 = (v in2 ? v out2 ) i out2 p dldo3 = (v in3 ? v out3 ) i out3 substituting p d (max) for p d and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. for example, when operating the mic2215 at 60c with a minimum footprint layout, the maximum load currents can be calculated as follows: p d (max) = (125c ? 60c)/43 c/w p d (max) = 1.511w
micrel, inc. mic2215 january 2007 10 m9999-011207 the junction-to-ambient thermal resistance for the minimum footprint is 43c/w, from table 2. the maximum power dissipation must not be exceeded for proper operation. using a lithium-ion battery as the supply voltage, 2.8v/250ma for channel 1, 3v/100ma for channel 2 and 2.8v/50ma for channel 3, maximum power can be calculated as follows: p dldo1 = (v in1 ? v out1 ) i out1 p dldo1 = (4.2v ? 2.8v) 250ma p dldo1 = 350mw p dldo2 = (v in2 ? v out2 ) i out2 p dldo2 = (4.2v ? 3.0v) 100ma p dldo2 = 120mw p dldo3 = (v in3 ? v out3 ) i out3 p dldo3 = (4.2v ? 2.8v) 50ma p dldo3 = 70mw p dtotal = p dldo1 + p dldo2 + p dldo3 p dtotal = 350mw + 120mw + 70mw p dtotal = 540mw the calculation shows that we are well below the maximum allowable power dissipation of 1.511w for a 60c ambient temperature. after the maximum power dissipation has been calculated, it is always a good idea to calculate the maximum ambient temperature for a 125c junction temperature. calculating maximum ambient temperature as follows: t a(max) = t j(max) ? (p d x ja ) t a(max) =125c ? (540mw x 43c/w) t a(max) = 101c for more information, please refer to the designing with low-dropout voltage regulators handbook. adjustable regulator application adjustable regulators use the ratio of two resistors to multiply the reference voltage to produce the desired output voltage. the mic 2215 can be adjusted from 1.25v to (5.5v?max v dropout ) by using two external resistors (figure 1). the resistors set the output voltage based on the following equation: ? ? ? ? ? ? + = r2 r1 1 v v ref out v ref = 1.25v out1 adj1 mic2215-aaa_m l r1 r2 figure 1. adjustable output
micrel, inc. mic2215 january 2007 11 m9999-011207 package information 16-pin (4mm x 4mm) mlf ? (ml) 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 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 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. ? 2004 micrel, incorporated.

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