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mic5325 low v in /v out 400ma uldo? with ultra-low iq uldo is a trademark of micrel, inc 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 general description the mic5325 is a high-performance, cap, low-dropout regulator, offering ultra-low operating current while maintaining very fast transient response. the mic5325 can source up to 400ma of output current and allows a low input supply voltage source to increase system efficiency. ideal for battery operated applications; the mic5325 offers high accuracy, extremely low dropout voltage, and low ground current at all load conditions. the mic5325 can also be put into a zero-off-mode current state, drawing virtually no current when disabled. the mic5325 is available in fixed-output voltages in the 6-pin 2mm x 2mm thin mlf ? leadless package. data sheets and support documentation can be found on micrel?s web site at www.micrel.com . features ? wide-input voltage range: 1.7v to 5.5v ? stable with 1f ceramic output capacitor ? ultra-low-dropout voltage uldo? 110mv @ 400ma ? 2% voltage accuracy over temperature ? bias supply voltage range: 2.5v to 5.5v ? adjustable output voltage range: 0.8v to 2.0v ? ultra-low ground current 35a typical ? 400ma maximum output current per ldo ? very fast transient response ? thermal-shutdown and cu rrent-limit protection ? tiny 6-pin 2mm x 2mm thin mlf ? package applications ? low-power handheld devices ? portable electronics ? gps receivers ? post regulator ___________________________________________________________________________________________________________ typical application august 2010 m9999-080510-b
micrel, inc. mic5325 august 2010 2 m9999-080510-b ordering information part number marking code output voltage temperature range package lead finish mic5325-1.2ymt qg4 1.2v ?40c to +125c 6-pin 2mm x 2mm thin mlf ? pb-free mic5325-1.5ymt qgf 1.5v ?40c to +125c 6-pin 2mm x 2mm thin mlf ? pb-free mic5325-1.8ymt qgg 1.8v ?40c to +125c 6-pin 2mm x 2mm thin mlf ? pb-free mic5325-3.6ymt qgv 3.6v ?40c to +125c 6-pin 2mm x 2mm thin mlf ? pb-free notes: 1. other voltages available. contact micrel for details. 2. contact marketing for adj version availability. 3. = pin 1 identifier. pin configuration 1vbias gnd in 6en byp/adj out 5 4 2 3 6-pin 2mm x 2mm thin mlf ? (mt) pin description pin number pin name pin function 1 vbias bias input voltage. 2 gnd ground 3 in power input for ldo. 4 out output of regulator. 5 byp/adj bypass: connect a capacitor to ground to reduce noise and reduce ripple rejection. adjust: feedback input from external resistor divider. 6 en enable input: active high input. logic hig h = on; logic low = off. do not leave floating.
micrel, inc. mic5325 august 2010 3 m9999-080510-b absolute maximum ratings (1) supply voltage (v in ) ............................................ 0v to v bias bias voltage (v bias ) ................................................ 0v to 6v enable voltage (v en )........................................... 0v to v bias power dissipation (p d ) ........................... internally limited (3) lead temperature (solde ring, 10 s ec.).................... 260c junction temperature (t j ) ........................?40c to +125c storage temperature (t s ) .........................?65c to +150c esd rating (4) .................................................................. 2kv operating ratings (2) supply voltage (v in )......................................... 1.7v to v bias bias voltage (v bias ).......................................... 2.5v to 5.5v enable voltage (v en )........................................... 0v to v bias junction temperature (t j ) ........................ ?40c to +125c junction thermal resistance 2x2 thin mlf-6 ( ja ) .........................................90c/w electrical characteristics (5) v bias = 3.6v; v in = v out + 1v; c out = 1f; i out = 100a; t j = 25c, bold values indicate ?40c to +125c, unless noted. parameter condition min. typ. max. units output voltage accuracy variation from nominal v out ?2.0 +2.0 % reference voltage adj pin voltage 0.7595 0.775 0.790 5 v v bias line regulation v bias = 3.6v to 5.5v; v in = v out + 1v 0.03 0.6 % v in line regulation v bias = 3.6v to 5.5v; v in = v out + 1v to 5.5v 0.02 0.6 % load regulation i out = 100a to 400ma 0.3 2 % v in dropout voltage i out = 400ma 110 250 mv ground pin current i out = 100a to 400ma; v in = v en ; v bias = 5.5v 35 55 a ground pin current in shutdown v en ? 0.2v 0.01 1 a ripple rejection f = up to 1khz; c out = 1f; no c byp f = up to 1khz; c out = 1f; c byp = 10nf f = 1khz ? 20khz; c out = 1 f; c byp = 10nf 50 60 65 40 db db db current limit v out = 0v 450 680 ma output voltage noise c out = 1f; c byp = 10nf; 10hz to 100khz 30 v rms enable inputs (en) logic low 0.2 v enable input voltage logic high 1.2 v v il ? 0.2v 0.01 a enable input current v ih ? 1v 0.02 a turn-on time c out = 1f; c byp = 10nf 150 500 s 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. human body model, 1.5k in series with 100pf. 5. specification for packaged product only.
micrel, inc. mic5325 august 2010 4 m9999-080510-b typical characteristics 0 -20 -40 -60 -80 -100 -120 power supply rejection ratio (v in ) 1 frequency (khz) 0.1 10 100 1,000 v in = v out +1v v out = 1.2v c out = 1f c byp = 0.01f 100ma 50ma 100a 100a (no byp) 300ma 400ma 0 -20 -40 -60 -80 -100 -120 power supply rejection ratio (v bias ) 1 frequency (khz) 0.1 10 100 1,000 v in = v out +1v v out = 1.2v c out = 1f c byp = 0.01f 100a 100a (no byp) 400ma 0 1 2 3 4 5 6 7 8 9 10 1.5 2 2.5 3 3.5 4 4.5 5 5.5 vin (v) ground current (v in ) vs. v in v bias = 5.5v v out = 1.8v c out = 1f c byp = 0.01f 0 1 2 3 4 5 6 7 8 9 10 ground current (v in ) vs. output current v in = 2.8v v out = 1.8v c out = 1f c byp = 0.01f 0 50 100 150 200 250 300 350 400 output current (ma) 0 2 4 6 8 10 12 14 16 18 ground current (v bias ) vs. output current v bias = 3.6v v in = 2.8v v out = 1.8v c out = 1f c byp = 0.01f 0 50 100 150 200 250 300 350 400 output current (ma) 10 12 14 16 18 20 22 24 26 28 30 ground current (total) vs. output current 0 50 100 150 200 250 300 350 400 output current (ma) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 vin (v) output voltage vs. v in v bias = 5.5v v out = 1.8v c out = 1f 400ma 100a 0 20 60 80 100 120 140 dropout voltage vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) 40 400ma 200ma 100ma 0 20 40 60 80 100 120 140 dropout voltage vs. output current v bias = 3.6v v in = 2.8v c out = 1f c byp = 0.01f c bais = 1f c in = 1f 0 50 100 150 200 250 300 350 400 output current (ma) 0 2 4 6 8 10 12 14 16 18 20 ground current (v in ) vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) v bias = 3.6v v in = 2.8v v out = 1.8v 400ma 100a 600 625 650 675 700 725 750 775 800 825 850 875 900 1.5 2 2.5 3 3.5 4 4.5 5 5.5 vin (v) current limit vs. v in v bias = 5.5v v out = 1.8v c out = 1f c in = 1f 1.6 1.65 1.7 1.75 1.8 output voltage vs. output current v bias = 3.6v v in = 2.8v c out = 1f c byp = 0.01f c in = 1f 0 50 100 150 200 250 300 350 400 output current (ma)
micrel, inc. mic5325 august 2010 5 m9999-080510-b typical characteristics (continued) 1.10 1.15 1.20 1.25 1.30 output voltage vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) v in = 2.2v v bias = 3.6v v out = 1.2v c out = 1f i out = 100a 0.700 0.725 0.750 0.800 0.825 0.850 0.875 0.900 reference voltage vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) v in = 2.2v v bias = 3.6v v out = 1.2v c out = 1f i out = 100a 0.775 0 2 4 6 8 10 12 14 16 18 20 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 enable voltage (v) bias current vs. enable voltage v bias = 3.6v v in = 2.8v v out = 1.8v c in = 1f c out = 1f c byp = 0.01f 400ma 100a 0.01 0.1 1 10 output noise spectral density 10 1k 10k 100k frequency (hz) 100 1m v in = 4.5v v out = 1.8v c out = 1f c byp = 0.01f noise (10hz to 1mhz) = 59v rms
micrel, inc. mic5325 august 2010 6 m9999-080510-b functional characteristics
micrel, inc. mic5325 august 2010 7 m9999-080510-b functional diagram vbias vin en gnd vout byp ldo current limit quick start reference thermal limit
micrel, inc. mic5325 august 2010 8 m9999-080510-b application information the mic5325 is a high performance, low-dropout linear regulator designed for low current applications requiring fast transient response. t he mic5325 utilizes two input supplies, significantly reducing dropout voltage, perfect for low-voltage, dc-to-dc conver sion. the mic5325 requires a minimum of external components. the mic5325 regulator is fully 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 the mic5325. bypassing on the bias pin is recommended to improve performance of the regulator during line and load transients. 1f ceramic capacitor from v bias -to-ground helps reduce high frequency noise from being injected into the control circuitry from the bias rail and is good design practice. input supply voltage v in provides the supply to power the ldo. the minimum input voltage is 1.7v, allowing conversion from low voltage supplies. output capacitor the mic5325 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 recom- mended because of their temperature performance. x7r- type capacitors change capacit ance by 15% over their operating 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 equivalent operating temperature range. input capacitor the mic5325 is a high-performance, high bandwidth device. therefore, it r equires a well-bypassed input supply for optimal performance. a 1f capacitor is required from the input-to-gr ound 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. bypass capacitor a capacitor can be placed fr om the noise bypass pin-to- ground to reduce output voltage noise. the capacitor bypasses the internal reference. 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 bypass capacitance. a unique, quick-start circuit allows the mic5325 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. minimum load current the mic5325, unlike most other regulators, does not require a minimum load to maintain output voltage regulation. enable/shutdown the mic5325 comes with a single active-high enable pin that allows the regulator to be disabled. 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 state on the output. thermal considerations the mic5325 is designed to provide 400ma of continuous current in a very small package. maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. given that the input voltage is 1.8v , the output voltage is 1.2v and the output current = 400ma. the actual power dissipation of the regulator circuit can be determined using the equation: p d = (v in ? v out1 ) i out + v in i gnd because this device is cmos and the ground current is typically <100a over the load range, the power dissipation contributed by t he ground current is < 1% and can be ignored for this calculation. p d = (1.8v ? 1.2v) 400ma p d = 0.18w 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) tt p t j(max) = 125c, the maximum junction temperature of the die ja thermal resistance = 90c/w.
micrel, inc. mic5325 august 2010 9 m9999-080510-b u1 mic5325-ymt vbias byp/adj vout gnd vin c1 1f/6.3v c2 1f/6.3v en vbias vin vout c3 0.01f/6.3v c4 1f/6.3v j1 v bias j2 gnd j3 vin j6 en j4 vo j5 gnd r3 10k bill of materials item part number manufacturer description qty. c1, c2, c4 vj0603g105kxycw1bc vishay (1) capacitor, 1f, 6.3v, size 0603 3 c3 vj0603y103kxqcw1bc murata (2) capacitor, 0.01f, 10v, size 0603 1 r3 crcw060310k0fkea vishay dale (1) resistor, 10k, 1%, 1/16w, size 0603 1 u1 mic5325-xxymt micrel, inc. (3) 400ma uldo? with ultra-low iq 1 notes: 1. vishay: www.vishay.com . 2. murata: www.murata.com . 3. micrel, inc.: www.micrel.com .
micrel, inc. mic5325 august 2010 10 m9999-080510-b pcb layout recommendations top layer bottom layer
micrel, inc. mic5325 august 2010 11 m9999-080510-b package information 6-pin 2mm x 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 app liances, devices or systems where malfu nction of a product 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 impla 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. can nt ? 2007 micrel, incorporated.

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