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| mp5410 low start-up voltage boost converter with four spdt switches mp5410 rev.1.01 www.monolithicpower.com 1 3/28/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. the future of analog ic technology description the mp5410 is a high efficiency, current mode step-up converter with four single-pole/double- throw (spdt) switches designed for low-power bias supply application. the device can boost dual-cell nicd/nimh or single-cell li+ battery to 10v output voltage. the mp5410 can start up from an input voltage as low as 1.8v. it uses a current limited variable frequency control algorithm to optimize efficiency and minimize external component size and cost. the internal low resistance n- channel mosfet switch can withstand up to 10v allowing the mp5410 to produce high output voltage with high efficiency. in addition, the mp5410 can disconnect all loads from input dc power supply. the integrated schottky diode reduces external parts to save critical board space. the mp5410 features low shutdown current allowing the part to draw less than 1a off current in shutdown mode. and it includes input under voltage and over temperature protection. the mp5410 is available in a small 16-pin qfn 3x3mm package. features ? 1.8v low voltage start-up ? 1.8v to 5.5v input range ? output disconnection ? integrated power mos & schottky diode ? variable frequency control ? <1 a shutdown current ? current mode control with internal compensation ? more than 80% efficiency at light load conditions ? tiny external components ? inrush current limiting and internal soft- start ? input uvlo ? over temperature protection ? 3x3mm qfn16 package applications ? dual-cell and three-cell nicd/nimh or single-cell li battery consumer products ? 3d glass driver ? small lcd displays bias supply ? digital still and video cameras ? handheld computers and pdas ? cell phones for mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks o f monolithic power systems, inc. typical application mp5410 sw fb l1 r1 r2 in s0 en gnd c in c out l+ battery s1 s2 s3 abcd l- r+ r- control signal iset l out r iset efficiency (%) v in (v) efficiency 50 55 60 65 70 75 80 85 90 95 100 1.6 2.6 3.6 4.6 5.6
mp5410?low start-up voltage boost converter with four spdt switches mp5410 rev.1.01 www.monolithicpower.com 2 3/28/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. ordering information part number* package top marking free air temperature (t a ) MP5410EQ qfn16 (3x3mm) abay -20 c to +85 c * for tape & reel, add suffix ?z (e.g. MP5410EQ?z); for rohs compliant packaging, add suffix ?lf (e.g. MP5410EQ?lf?z) package reference top view exposed pad connect to gnd pin 1 id l en s1 s0 iset fb s2 s3 1 2 3 4 13 14 15 16 8 7 6 5 d c b a gnd in sw out 12 11 10 9 qfn16 (3x3mm) absolute maxi mum ratings (1) sw, out, a, b, c, d..................... -0.5v to +12v all other pins ................................ -0.5v to +6.5v continuous power dissipation (t a = +25c) (2) ........................................................... 2.08w junction temperature ............................... 150 c lead temperature .................................... 260 c storage temperature ............... -65 c to +150 c recommended operating conditions (3) supply voltage v in .......................... 1.8v to 5.5v boost converter output voltage ......... v in to 10v maximum junction temp. (t j ) ............... +125 c thermal resistance (4) ja jc qfn16 (3x3mm) .................... 60 ...... 12 ... c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max)=(t j (max)- t a )/ ja . exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operation conditions. 4) measured on jesd51-7, 4-layer pcb. mp5410?low start-up voltage boost converter with four spdt switches mp5410 rev.1.01 www.monolithicpower.com 3 3/28/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. electrical characteristics v in = v en = 2.4v, v out = 10v, i out = 2ma, t a = +25 c, unless otherwise noted. parameters symbol condition min typ max units operating input voltage v in 1.8 5.5 v minimum startup voltage v st v out =0v 1.8 v quiescent current i qns i out =0, v fb =1.3v, no switching 28 50 a shutdown current i sd v en =0v 0.1 1 a in under voltage lockout v uvlo v in rising 1.58 1.7 v under voltage lockout hysteresis 100 mv step-up converter maximum on time t on 4 6 7.5 s minimum off time t off 400 550 700 ns sw on-resistance r ds on i sw = 200ma 0.65 0.8 ? sw leakage current i sw lkg v sw =12v 2 a sw current limit i sw limit r iset =300k ? 180 ma schottky diode forward voltage v fw i fw =100ma 0.4 0.5 0.6 v fixed out supply voltage v out fixed let fb pin floating, 1.8v mp5410?low start-up voltage boost converter with four spdt switches mp5410 rev.1.01 www.monolithicpower.com 5 3/28/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical performanc e characteristics v in = v en = 2.4v, v out = 10v, i out = 2ma, l = 10h/150m ? , unless otherwise noted. 0 100 200 300 400 500 600 700 800 900 0 200 400 600 800 1000 v in vs. current limit r iset vs. current limit efficiency (%) v in (v) v in (v) efficiency 50 55 60 65 70 75 80 85 90 95 100 1.6 2.6 3.6 4.6 5.6 0 50 100 150 200 250 1.6 2.6 3.6 4.6 5.6 current limit (ma) current limit (ma) mp5410?low start-up voltage boost converter with four spdt switches mp5410 rev.1.01 www.monolithicpower.com 6 3/28/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical performanc e characteristics (continued) v in = v en = 2.4v, v out = 10v, i out = 2ma, l = 10h/150m ? , unless otherwise noted. mp5410?low start-up voltage boost converter with four spdt switches mp5410 rev.1.01 www.monolithicpower.com 7 3/28/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. function block diagram figure 1?mp5410 function block diagram mp5410?low start-up voltage boost converter with four spdt switches mp5410 rev.1.01 www.monolithicpower.com 8 3/28/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. operation the mp5410 is a step-up converter with four single-pole/double-throw (spdt) switches designed for low-power bias supply application. it operates from an input voltage as low as 1.8v. the 0.65 ? internal n-channel mosfet power switch and low dropout voltage schottky diode are driven with a variable frequency, constant peak-current architecture for improved regulation and low operating current. operation can be best understood by referring to the block diagram. output disconnection the mp5410 integrates disconnect switch between in pin & l pin. the disconnect switch is composed of a nmos and a pmos in parallel. the mp5410 can disconnect all loads from input dc power supply when en pin is connected to ground. under voltage lockout an under voltage lockout function prevents device startup if the supply voltage on vbat is lower than approximately 1.5v. when in operation and the battery is being discharged, the device automatically enters the shutdown mode if the voltage on v in drops below 1.5v. system start-up when the mp5410 is enabled, the pmos of disconnect switch is turned on first, and then the system starts boosting the step-up converter with an internal soft-start and the output voltage rises up. the nmos of disconnect switch is driven by vout. it will be turned on once the output voltage reaches the threshold level. the on-resistance of nmos is smaller than that of pmos, so the pmos is shorted by noms at normal operation to reduce the conduction loss. it is recommended on the start up sequence that the enable signal comes after input voltage established. soft-start and inrush current limiting are provided during start-up as well as normal mode operation. soft-start the mp5410 provides soft-start by charging an internal capacitor with a very weak current source. the voltage on this capacitor, in turn, slowly ramps the peak inductor current limit from zero to the setting value. the mp5410 limits this inrush current by increasing the current limit in two steps, starting from i lim /4 for 256 switching cycles to i lim /2 for the next 256 cycles, and then full current limit. the soft-start time varies greatly with load current; output voltage and input voltage. variable frequency constant-peak-current operation when the power mosfet is turned on the inductor current increases until the current limit is reached. the power mosfet is then turned off for a setting minimum off time. at the end of this minimum of time transition if the feedback pin is still lower than the 1.23v internal reference the power mosfet will again be turned on, otherwise the mp5410 waits until the voltage drops below the threshold before turning on the mosfet again. this process allows for optimal use of the inductor, while minimizing the output ripple and size of the output capacitor and maintaining low operating current. integrated schottky diode the high switching frequency demands a high- speed rectification for optimum efficiency the mp5410 integrates a low voltage-drop schottky diode to reduce external parts to save critical board space. four spdt switches the mp5410 includes four spdt analog switches. s0~s1 control the switches respectively. if the chip is enabled, a logic low input switches the relative channel output to gnd and a logic high input switches it to out. mp5410?low start-up voltage boost converter with four spdt switches mp5410 rev.1.01 www.monolithicpower.com 9 3/28/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. table 1?switching selection control logic en control input switch output s0 s1 s2 s3 a b c d l x x x x open open open open h l l l l gnd gnd gnd gnd h h l l l out gnd gnd gnd h l h l l gnd out gnd gnd h h h l l out out gnd gnd h l l h l gnd gnd out gnd h h l h l out gnd out gnd h l h h l gnd out out gnd h h h h l out out out gnd h l l l h gnd gnd gnd out h h l l h out gnd gnd out h l h l h gnd out gnd out h h h l h out out gnd out h l l h h gnd gnd out out h h l h h out gnd out out h l h h h gnd out out out h h h h h out out out out h: high level l: low level x: don?t care mp5410?low start-up voltage boost converter with four spdt switches mp5410 rev.1.01 www.monolithicpower.com 10 3/28/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. application information components referenced below apply to typical application circuit on page 11. setting the sw current limit the resistor on iset pin is used to set the sw current limit. the relationship of the sw current limit vs. the iset resistor is showed as the curve in page 5. for constant-peak-current operation, when the power mosfet is turned on the inductor current increases until the current limit is reached. since the response delay, the actual sw peak current value exceeds the setting current limit a little. under the higher input voltage and with the lower inductor, the actual sw peak current is higher due to the faster sw current di/dt. under same condition, a lower current limit allows lower sw current and higher switching frequency, while a higher current limit allows higher sw current and lower switching frequency. setting the output voltage mp5410 features internal resistive voltage divider, so floating the fb pin to achieve fixed about 10v output. connect to an external resistive voltage divider from the output to fb to set the boost converter output voltage. set the output voltage by selecting the resistive voltage divider ratio by the equation: out fb r1 r2 vv r2 + = where, v out is the output voltage, v fb = 1.23v. for r1=178k ? and r2 = 24.9k ? , then v out = 10v. selecting the inductor a inductor with a dc current rating of at least 40% higher than the maximum input current is recommended for most applications at wide input range. for highest efficiency, the inductor?s dc resistance should be as small as possible. selecting the input capacitor the input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. the input capacitor impedance at the switching frequency should be less than the input source impedance to prevent high frequency switching current from passing through the input. ceramic capacitors with x5r or x7r dielectrics are highly recommended because of their low esr and small temperature coefficients. for most applications, a 4.7 f or 10 f capacitor is sufficient. selecting the output capacitor the output capacitor keeps the output voltage ripple small and ensures feedback loop stability. the output capacitor impedance should be low at the switching frequency. ceramic capacitors with x7r dielectrics are recommended for their low esr characteristics. for most applications, a less than 10 f ceramic capacitor is sufficient. layout considerations careful attention must be paid to the pcb board layout and components placement. proper layout of the high frequency switching path is critical to prevent noise and electromagnetic interference problems. the loop of mp5410 sw to gnd pin, sw to out pin, and output capacitor is flowing with high frequency pulse current. it must be as short as possible. the in pin is the power supply input for the internal mosfet switch gate driver and the internal control circuitry. it must be locally bypassed. see the mp5410 demo board layout for reference. mp5410?low start-up voltage boost converter with four spdt switches mp5410 rev.1.01 www.monolithicpower.com 11 3/28/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical application circuit figure 2?battery powered, v out =10v, 3d glass driver mp5410?low start-up voltage boost converter with four spdt switches notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp5410 rev. 1.01 www.monolithicpower.com 12 3/28/2011 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. package information qfn16 (3x3mm) side view top view 1 16 13 12 9 85 4 bottom view 2.90 3.10 1.50 1.80 2.90 3.10 1.50 1.80 0.50 bsc 0.18 0.30 0.80 1.00 0.00 0.05 0.20 ref pin 1 id marking 1.70 0.50 0.25 recommended land pattern 2.90 note: 1) all dimensions are in millimeters . 2) exposed paddle size does not include mold flash . 3) lead coplanarity shall be 0.10 millimeter max. 4) drawing conforms to jedec mo-220, variation veed-4. 5) drawing is not to scale. pin 1 id see detail a pin 1 id option a 0.30x45 o typ. pin 1 id option b r0.20 typ. detail a pin 1 id index area 0.70 0.30 0.50 |
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