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  MP2209 16v, 2a, 600khz synchronous step-down converter MP2209 rev. 1.01 www.monolithicpower.com 1 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the MP2209 is an internally compensated 600khz fixed frequency pwm synchronous step-down regulator. with a 3v to 6v bias supply, MP2209 operates from a 3v to 16v input and generates an adjustable output voltage from 0.8v to 0.9xv in at up to 2a load current. the MP2209 integrates a 80m ? high-side switch and a 80m ? synchronous rectifier for high efficiency without an external schottky diode. with peak current mode control and internal compensation, it can be stabilized with ceramic capacitors and small inductors. fault condition protection includes short-circuit protection, cycle-by-cycle current limiting and thermal shutdown. the MP2209 is available in small 3mmx4mm 14-lead qfn packages. features ? 2a output current ? input supply range: 3v to 16v ? 80m ? internal power mosfet switches ? stable with ceramic output capacitors ? high efficiency ? 600khz fixed switching frequency ? adjustable output from 0.8v to 0.9xv in ? frequency synchronization ? power good pin ? thermal shutdown ? cycle-by-cycle current limiting ? short circuit protection ? 3mmx4mm 14-lead qfn package applications ? p/asic/dsp/fpga core and i/o supplies ? printers and lcd tvs ? network and telecom equipment ? point of load regulators all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application MP2209 bs in fb sw 14 4, 11 13 8 7 1, 3, 12 5, 10 en/sync vcc pok ss agnd/pgnd v out 1.8v / 2a v in 3v to 16v v cc 3v to 6v 9 2 c6 10nf efficiency vs. load current 75 80 85 90 95 100 efficiency (%) 0 0.5 1.0 1.5 2.0 load current (a)
MP2209 ? 16v, 2a, 600khz synchronous step-down converter MP2209 rev. 1.01 www.monolithicpower.com 2 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. ordering information part number* package top marking free air temperature (t a ) MP2209dl qfn14 (3mm x 4mm) 2209 ?40 c to +85 c * for tape & reel, add suffix ?z (eg. MP2209dl?z). for rohs compliant packaging, add suffix ?lf (eg. MP2209dl?lf?z) package reference 14 13 12 11 10 9 8 1 2 3 4 5 6 7 absolute maxi mum ratings (1) in to gnd ..................................... - 0.3v to +18v sw to gnd ........................... - 0.3v to v in + 0.3v .............................-2.5v to v in + 2.5v for < 50ns fb, en/sync, vcc to gnd........... - 0.3v to +6.5v bs to sw ..................................... - 0.3v to +6.5v continuous power dissipation (t a = +25c) (2) ??????????????????....2.6w junction temperature ...............................150c lead temperature ....................................260c storage temperature............... - 65c to +150c recommended operating conditions (3) supply voltage v in ..............................3v to 16v bias voltage v cc ...................................3v to 6v output voltage v out ..................0.8v to 0.9 x v in operating junct. temp (t j )...... - 40c to +125c en/sync voltage.................. no more than v cc thermal resistance (4) ja jc qfn14 (3mm x 4mm) .............48 ...... 11 ... 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 operating conditions. 4) measured on jesd51-7, 4-layer pcb.
MP2209 ? 16v, 2a, 600khz synchronous step-down converter MP2209 rev. 1.01 www.monolithicpower.com 3 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics (5) v in = 12v, v cc = v en = 3.6v, t a = +25 c, unless otherwise noted. parameters condition min typ max units v cc supply current v en = v cc v fb = 0.85v 750 a v cc shutdown current v en = 0v, v in = 12v , v cc = 6v 1 a v cc undervoltage lockout threshold rising edge 2.8 2.95 v v cc undervoltage lockout hysteresis 200 mv in under voltage lockout threshold rising edge 2.85 2.95 v in under voltage lockout hysteresis 300 mv t a = +25c 0.781 0.794 0.807 v regulated fb voltage ?40c t a +85c 0.770 0.818 v fb input current v fb = 0.85v ?50 50 na en high threshold ?40c t a +85c 1.6 v en low threshold ?40c t a +85c 0.4 v soft-start charging current 5 a high-side switch on-resistance i sw = 300ma 80 m ? low-side switch on-resistance i sw = ?300ma 80 m ? sw leakage current v en = 0v; v in = 12v v sw = 0v or 12v ?10 10 a bs under voltage lockout threshold 2 v high-side switch current limit sourcing 4 a low-side switch current limit sinking 2 a oscillator frequency 450 600 750 khz synch frequency 0.5 2 mhz minimum on time 50 ns maximum duty cycle 90 % thermal shutdown threshold hysteresis = 20c 150 c note: 5) production test at +25c. specificat ions over the temperature range are guaranteed by design and characterization.
MP2209 ? 16v, 2a, 600khz synchronous step-down converter MP2209 rev. 1.01 www.monolithicpower.com 4 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions pin # name description 1, 3, 12 pgnd, agnd, exposed pad ground. connect these pins with larger copper areas to the negative terminals of the input and output capacitors. connect exposed pad to gnd plane for proper thermal performance. 2 ss soft-start input. place a capacitor from ss to agnd. the ss pin sources 5 a. as the ss voltage rises, the feedback threshold volt age increases to limit the inrush current during start-up. do not leave this pin open. 4, 11 sw switch node connection to the inductor. these pins connect to the internal high and low- side power mosfet switches. all sw pins must be connected together externally. 5, 10 in input supply. this supplies po wer to the high side switch. a decoupling capacitor to ground is required close to this pin to reduce switching spikes. 6 n/c no connect. 7 bs bootstrap. a capacitor between this pin and sw provides a floating supply for the high- side gate driver. 8 vcc bias supply. this supplies power to both the internal control circuit and the gate drivers. a decoupling capacitor to ground is required close to this pin. 9 pok power okay pin. open drain power g ood output. ?high? input indicates v out is within 10% window, ?low? output indicates v out is out of 10% window. 13 en/sync enable and frequency synchronization input pin. forcing this pin below 0.4v shuts down the part. forcing this pin above 1.6v tu rns on the part. applying a 500khz to 2mhz clock signal to this pin synchronizes the inte rnal oscillator frequency to the external source. 14 fb feedback. this is the input to the error amplif ier. an external resistive divider connected between the output and gnd is compared to the internal 0.8v reference to set the regulation voltage. don?t apply a voltage more than v cc to this pin.
MP2209 ? 16v, 2a, 600khz synchronous step-down converter MP2209 rev. 1.01 www.monolithicpower.com 5 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics v cc = 5v, v out = 1.8v, t a = +25oc, unless otherwise noted. v in =5v,i o =0a switching waveform v in =12v,i o =0a enable start-up v in =12v,i o =2a enable start-up v in =12v,i o =0a switching waveform v o /ac 10mv/div. i l 500ma/div. v sw 2v/div. v en 5v/div. v sw 10v/div. i l 2a/div. v o 1v/div. v en 5v/div. v sw 10v/div. i l 2a/div. v o 1v/div. v o /ac 10mv/div. 500ma/div. v sw 5v/div. v in =12v,i o =0a enable shut-down enable shut-down v in =12v,i o =2a v en 5v/div. v sw 10v/div. i l 1a/div. v o 1v/div. v en 5v/div. v sw 10v/div. i l 2a/div. v o 1v/div. 400ms/div.
MP2209 ? 16v, 2a, 600khz synchronous step-down converter MP2209 rev. 1.01 www.monolithicpower.com 6 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics v cc = 5v, v out = 1.8v, t a = +25oc, unless otherwise noted. ( continued ) v in =12v short circuit protection v in =12v short circuit recovery v out 1v/div. v sw 10v/div. v out 1v/div. v sw 10v/div. 200ns/div load transient 1a-2a step resistive load v out 100mv/div. steady state operation steady state operation 10ms/div. 2ms/div. 400ns/div 400ns/div half load full load out 10mv/div. v v v out 10mv/div. sw 5v/div. v sw 5v/div. i inductor 1a/div. i inductor 2a/div. i inductor 2a/div. i inductor 1a/div. i inductor 1a/div.
MP2209 ? 16v, 2a, 600khz synchronous step-down converter MP2209 rev. 1.01 www.monolithicpower.com 7 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. functional block diagram -- + + -- + logic slope compensation and peak current limit pwm current comparator en comp slope clk en exclk osc en/sync logic uvlo uvlo 0.8v 0.5pf 1.2 meg 17pf in in bs sw sw gnd gnd fb en/sync ss vcc -- + -- + 0.72v 0.88v pok figure 1?functional block diagram
MP2209 ? 16v, 2a, 600khz synchronous step-down converter MP2209 rev. 1.01 www.monolithicpower.com 8 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. operation pwm control the MP2209 is a constant frequency peak- current-mode control pwm switching regulator. refer to the functional block diagram. the high side n-channel dmos power switch turns on at the beginning of each clock cycle. the current in the inductor increases until the pwm current comparator trips to turn off the high side dmos switch. the peak inductor current at which the current comparator shuts off the high side power switch is controlled by the comp voltage at the output of feedback error amplifier. the transconductance from the comp voltage to the output current is set at 11.25a/v. this current-mode control greatly simplifies the feedback compensation design by approximating the switching converter as a single-pole system. only type ii compensation network is needed, which is integrated into the MP2209. the loop bandwidth is adjusted by changing the upper resistor value of the resistor divider at the fb pin. the internal compensation in the MP2209 simplifies the compensation design, minimizes external component counts, and keeps the flexibility of external compensation for optimal stability and transient response. enable and frequency synchronization (en/sync pin) this is a dual function input pin. forcing this pin below 0.4v for longer than 4us shuts down the part; forcing this pin above 1.6v for longer than 4 s turns on the part. applying a 0.5mhz to 2mhz clock signal to this pin also synchronizes the internal oscillator frequency to the external clock. when the external clock is used, the part turns on after detecting the first few clocks regardless of duty cycles. if any on or off period of the clock is longer than 4 s, the signal will be intercepted as an enable input and disables the synchronization. for automatic start up, connect this pin to v cc with a pull-up resistor; don?t apply a voltage more than v cc to this pin. soft-start and output pre-bias startup the soft start time can be adjusted by connecting a capacitor from this pin to ground. when the soft-start period starts, an internal 5 a current source begins charging the external capacitor. during soft-start, the voltage on the soft-start capacitor is connected to the non-inverting input of the error amplifier. the soft-start period lasts until the voltage on the soft-start capacitor exceeds the reference voltage of 0.8v. at this point the reference voltage takes over at the no inverting error amplifier input. the soft-start time can be calculated as follows: 0.8v c (nf) ss t(ms)= ss 5 a if the output of the MP2209 is pre-biased to a certain voltage during startup, the ic will disable the switching of both high-side and low-side switches until the voltage on the internal soft-start capacitor exceeds the sensed output voltage at the fb pin. over current protection the MP2209 offers cycle-to-cycle current limiting for both high-side and low-side switches. the high-side current limit is relatively constant regardless of duty cycles. when the output is shorted to ground, causing the output voltage to drop below 50% of its nominal output, the ic is shut down momentarily and begins discharging the soft start capacitor. it will restart with a full soft-start when the soft-start capacitor is fully discharged. this hiccup process is repeated until the fault is removed. power good output (pok pin) the MP2209 includes an open-drain power good output that indicates whether the regulator output is within 10% of its nominal output. when the output voltage moves outside this range, the pok output is pulled to ground. there is a 30 s deglitch time when pok output change its state. connect this pin to v cc through a pull-up resistor to get a proper power good output.
MP2209 ? 16v, 2a, 600khz synchronous step-down converter MP2209 rev. 1.01 www.monolithicpower.com 9 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. bootstrap (bst pin) the gate driver for the high-side n-channel dmos power switch is supplied by a bootstrap capacitor connected between the bs and sw pins. when the low-side switch is on, the capacitor is charged through an internal boost diode. when the high-side switch is off and the high-side switch turns on, the voltage on the bootstrap capacitor is boosted above the input voltage and the internal bootstrap diode prevents the capacitor from discharging. input uvlo both vcc and in pins have input uvlo detection. until both vcc and in voltage exceed under voltage lockout threshold, the parts remain in shutdown condition. there are also under voltage lockout hysesteres at both vcc and in pins.
MP2209 ? 16v, 2a, 600khz synchronous step-down converter MP2209 rev. 1.01 www.monolithicpower.com 10 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. application information setting the output voltage the external resistor divider sets the output voltage (see figure 1). the feedback resistor r1 also sets the feedback loop bandwidth with the internal compensation network (see figure 1). the relation between r1 and feedback loop bandwidth ( f c ) , output capacitance ( c o ) is as follows: 6 co 1.24 10 r1(k ) f(khz) c(uf) = the recommended feedback loop bandwidth (f c ) is no higher than 1/10 th of switching frequency of MP2209. in the case of ceramic capacitor as c o , it?s usually set to be in the range of 30khz and 50khz for optimal transient performance and good phase margin. if electrolytic capacitor is used, the recommended loop bandwidth is no higher than 1/4 th of the esr zero frequency ( f esr ). f esr is given by: esr esr o 1 f 2r c = for example, choose f c =50khz with ceramic capacitor, c o =47uf, r1 is estimated to be 523k ? . r2 is then given by: out r1 r2 v 1 0.8v = ? table 1?resistor selection vs. output voltage setting vout (v) r1 (k ? ) r2 (k ? ) l ( h) cout (ceramic) 1.2 499 1000 1 h-4.7 h 47 f 1.5 499 562 1 h-4.7 h 47 f 1.8 499 402 1 h-4.7 h 47 f 3.3 499 158 1 h-4.7 h 47 f 5 499 95.3 1 h-4.7 h 47 f table 2?suggested surface mount inductors manufacturer part number inductance ( h) max dcr (m ? ) current rating (a) dimensions l x w x h (mm3) toko fda1055-3r3m 3.3 7.3 11.7 10.8x11.6x5.5 wurth electronics 744314330 3.3 9.6 8 7x6.9x5 tdk ulf100457-3r3n6r9 3.3 11.6 7.5 10x9.7x4.5 selecting the inductor a 1 h to 4.7 h inductor with dc current rating at least 25% higher than the maximum load current is recommended for most applications. for best efficiency, the inductor dc resistance shall be <10m ? . see table 2 for recommended inductors and manufacturers. for most designs, the inductance value can be derived from the following equation: out in out in l osc vx(v v) l vxixf ? = where i l is inductor ripple current. choose inductor ripple current approximately 30% of the maximum load current, 2a. the maximum inductor peak current is l l(max) load i ii 2 =+ under light load conditions, larger inductance is recommended for improved efficiency input capacitor selection the input capacitor reduces the surge current drawn from the input and switching noise from the device. the input capacitor impedance at the switching frequency shall be less than input source impedance to prevent high frequency switching current passing to 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 47 f capacitor is sufficient.
MP2209 ? 16v, 2a, 600khz synchronous step-down converter MP2209 rev. 1.01 www.monolithicpower.com 11 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. output capacitor selection the output capacitor keeps output voltage ripple small and ensures regulation loop stable. the output capacitor impedance shall be low at the switching frequency. ceramic capacitors with x5r or x7r dielectrics are recommended. if electrolytic capacitor is used, pay attention to output ripple voltage, extra heating, and the selection of feedback resistor r1 (refer to ?output voltage setting? section) due to large esr of electrolytic capacitor. pcb layout guide pcb layout is very important to achieve stable operation. it is highly recommended to duplicate evb layout for optimum performance. if change is necessary, please follow the guidelines as follows. here, the typical application circuit is taken as an example to illustrate the layout rules should be followed. 1) for MP2209, a pcb layout with >=4 layers is recommended. 2) the high current paths (gnd, in and sw) should be placed very close to the device with short, direct and wide traces. 3) two input ceramic capacitors (2 x (10 f~22 f)) are strongly recommended to be placed on both sides of the MP2209dl package and keep them as close as possible to the ?in? and ?gnd? pins. 4) a rc (see the typical application circuit, r4=10 ? , c4=1 f ceramic capacitor) low pass filter is recommended for vcc supply. c4 must be placed as close as possible to ?vcc? pin and ?gnd? pin. 5) the external feedback resistors shall be placed next to the fb pin. keep the fb trace as short as possible. 6) keep the switching node sw short and away from the feedback network. top layer inner layer-1 inner layer-2 bottom layer figure 2 D pcb layout (four layers)
MP2209 ? 16v, 2a, 600khz synchronous step-down converter 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. MP2209 rev. 1.01 www.monolithicpower.com 12 7/11/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information 3mm x 4mm qfn14 side view top view 1 14 8 7 bottom view 2.90 3.10 1.60 1.80 3.90 4.10 3.20 3.40 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 do es not include mold flash. 3) lead coplanarity sha ll be 0.10 millimeter max. 4) jedec reference is mo-229, variation vged-3. 5) drawing is not to scale. pin 1 id see detail a 3.30 0.70 pin 1 id option b r0.20 typ. pin 1 id option a 0.30x45 o typ. detail a 0.30 0.50 pin 1 id index area


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