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MP2229 high efficiency 21v, 6a synchronous step-down c onverter with external sync, low-power mode, and external soft-start MP2229 rev. 1.0 www.monolithicpower.com 1 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. the future of analog ic technology description the MP2229 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with internal power mosfets. it offers a compact solution to achieve a 6a continuous output current over a wide input-supply range with excellent load and line regulation. the MP2229 has synchronous-mode operation for higher efficiency over the output current load range. current-mode operation provides fast transient response and eases loop stabilization. full protection features include over-current protection (ocp) and thermal shutdown (tsd). the MP2229 requires a minimal number of readily available, standard, external components and is available in a space-saving 3mm x 3mm 14-pin qfn package. features ? wide 4.5v to 21v operating input range ? 6a output current ? low 40m /18m r ds(on) of internal power mosfets ? programmable switching frequency ? frequency sync from 300khz to 2mhz external clock ? low-power mode selectable by an external signal ? external soft-start ? pre-bias start-up ? ocp with hiccup mode ? thermal shutdown ? output adjustable from 0.6v ? available in a qfn-14 (3mmx3mm) package applications ? dsl modems ? cable modems ? set -top boxes ? telecom ? distributed power systems all mps parts are lead-free, halogen-free, and adhere to the rohs directive. fo r mps green status, please visit the m ps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks o f monolithic power systems, inc. typical application 40 45 50 55 60 65 70 75 80 85 90 95 100 0.01 0.1 1 10
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 2 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. ordering information part number package top marking MP2229gq* qfn-14 (3mm3mm) see below * for tape & reel, add suffix ?z (eg. MP2229gq?z); top marking agq: product code of MP2229gq; y: year code; lll: lot number; package reference qfn-14 (3mmx3mm) ?
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 3 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. absolute maxi mum ratings (1) v in ..................................................-0.3v to 24v v sw ...................................................................... -0.3v (-5v for <10ns) to 24v (28v for <10ns) v bst ................................................... v sw + 5.5v all other pins ............................ -0.3v to 5.5v (2) continuous power dissipation (t a = +25c) (3) ................................................................... 2.1w junction temperature ...............................150c lead temperature ....................................260c storage temperature?????-65c to 150c recommended operating conditions (4) supply voltage v in ...........................4.5v to 21v output voltage v out ................0.6v to v in x d max operating junction temp. (t j ) -40c to +125c thermal resistance (5) ja jc qfn-14 (3mmx3mm) .......... 60 ...... 12... c/w notes: 1) exceeding these ratings may damage the device. 2) please refer to the ?enable control? section on page 12 fo r the absolute maximum rating of en. 3) 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 powe r dissipation produces an excessive die temperature, causing the regulator to go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 4) the device is not guaranteed to function outside of its operating conditions. 5) measured on jesd51-7, 4-layer pcb.
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 4 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. electrical characteristics v in =12v, t j =-40c to +125c (6) , typical value is tested at t j =+25c, unless otherwise noted. parameters symbol condition min typ max units supply current (shutdown) i s v en = 0v,t j =25c 8.5 12 a supply current (quiescent) i q v en = 2v, v fb = 0.7v 400 500 a hs switch-on resistance hs rds-on v bst-sw =5v 40 m ? ls switch-on resistance ls rds-on v cc =5v 18 m ? switch leakage sw lkg v en = 0v, v sw = 0v or 12v, t j =25c 1 a current limit (7) i limit duty=40% 7.5 10.5 a r set =30k 380 500 610 khz r set =51k 200 300 380 khz oscillator frequency f sw r set =6.7k 1400 1800 2100 khz maximum duty cycle d max v fb = 500mv 90 95 % minimum on time (8) t on 50 ns sync frequency range f sync 0.3 2 mhz foldback frequency f fold v fb = 100mv 0.5 f sw t j = 25c 594 600 606 mv feedback voltage v fb t j =-40c to +125c 591 600 609 mv feedback current i fb v fb = 650mv 50 na en falling threshold v en-falling 0.98 1.2 1.34 v en rising threshold v en-rising 1.28 1.46 1.65 v en pull-up current i en 1 2.3 3.6 a v in under-voltage lockout threshold rising inuv vth 3.85 4.1 4.35 v v in under-voltage lockout threshold hysteresis inuv hys 600 mv vcc regulator v cc 5 v vcc load regulation i cc =5ma 1 % soft-start current i ss 7 10 13 a thermal shutdown (8) t sd 150 c thermal shutdown hysteresis (8) t sd-hys 30 c note: 6) not tested in production. guaranteed by over-temperature correlation. 7) guaranteed by engineering sample characterization. 8) guaranteed by design.
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 5 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. pin functions package pin # name description 1, 12, 13, 14 gnd ground. connect gnd pins with larger coppe r areas to the negative terminals of the input and output capacitors. 2, 11 sw switch output. use wide pc b traces to make the connection. 3, exposed pad in supply voltage input. the MP2229 operates from a 4.5v to 21v input rail. requires a low esr and a low-inductance capacitor to decouple the input rail. place the input capacitor very close to in and connect it with wide pcb traces and multiple vias. 4 en enable. en high enables the MP2229. en sources 2.3 a. float en to enable the MP2229 automatically. 5 lpm low-power mode input. an active-high signal enables low-power mode operation. connect lpm to gnd to disable the converter and make the converter operate constantly in ccm. 6 fb feedback. connect to the tap of an external resistor divider from the output to gnd to set the output voltage. 7 ss soft-start. connect an external capacitor to program the soft-start time for the switch- mode regulator. 8 freq/ sync switching frequency program input. connect a resistor from freq/sync to gnd to set the switching frequency. also, freq/ sync serves as a frequency-synchronous clock input. 9 vcc internal bias supply. internal 5v ldo output. decouple with 0.1f capacitor. the decouple capacitor must be close enough to vcc to increase noise immunity. 10 bst bootstrap. requires a capacitor connect ed between sw and bst to form a floating supply across the high-side switch driver. a 10 ? resistor placed between sw and the bst cap is recommended strongly to reduce the sw spike voltage.
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 6 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performanc e characteristics performance waveforms are captured from the evaluation board discussed in the design example section. v in = 12v, v out = 1v, l = 1h, f s =500khz, t a = +25c, unless otherwise noted. 50 55 60 65 70 75 80 85 90 95 100 0123456 60 65 70 75 80 85 90 95 100 0.01 0.1 1 10 -0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2 0.01 0.1 1 10 60 65 70 75 80 85 90 95 100 0.01 0.1 1 10 60 65 70 75 80 85 90 95 100 0.01 0.1 1 10 0123456 -0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2 load regulation (%) 0123456 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2 50 55 60 65 70 75 80 85 90 95 100 0.01 0.1 1 10 0123456 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 7 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performanc e characteristics (continued) performance waveforms are captured from the evaluation board discussed in the design example section. v in = 12v, v out = 1v, l = 1h, f s =500khz, t a = +25c, unless otherwise noted.
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 8 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performanc e characteristics (continued) performance waveforms are captured from the evaluation board discussed in the design example section. v in = 12v, v out = 1v, l = 1h, f s =500khz, t a = +25c, unless otherwise noted.
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 9 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performanc e characteristics (continued) performance waveforms are captured from the evaluation board discussed in the design example section. v in = 12v, v out = 1v, l = 1h, f s =500khz, t a = +25c, unless otherwise noted.
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 10 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical performanc e characteristics (continued) performance waveforms are captured from the evaluation board discussed in the design example section. v in = 12v, v out = 1v, l = 1h, f s =500khz, t a = +25c, unless otherwise noted. v sw 10v/div. v en 5v/div. v out 500mv/div. 100s/div. shutdown through enable i out = 6a 10ms/div. short-circuit entry i out = 6a v out /ac 100mv/div. v sw 10v/div. v out 500mv/div. v in 10v/div. 10ms/div. short-circuit recovery i out = 6a 4m s/div. short-circuit steady state i l 10a/div. i l 5a/div. v sw 10v/div. v out 500mv/div. v in 10v/div. i l 10a/div. v sw 10v/div. v out 500mv/div. v in 10v/div. i l 10a/div. i l 2a/div. 100s/div. load transient i out = 3a to 6a
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 11 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. functional block diagram figure 1. functional block diagram
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 12 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. operation the MP2229 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with internal power mosfets. it offers a compact solution to achieve a 6a continuous output current over a wide input-supply range with excellent load and line regulation. when MP2229 works in fixed-frequency peak current-mode control to regulate the output voltage, the internal clock initiates the pwm cycle and turns on the integrated high-side power mosfet (hs-fet). the hs-fet remains on until its current reaches the value set by the comp voltage. when the power switch is off, it remains off until the next clock cycle starts. if the current in the power mosfet does not reach the value set by the comp value within 95% of one pwm period, then the hs-fet is forced off. error amplifier (ea) the error amplifier compares the fb voltage against the internal 0.6v reference (v ref ) and outputs a current proportional to the difference between the two. this output current charges or discharges the internal compensation network to form the comp voltage, which controls the power mosfet current. the optimized internal compensation network minimizes the external component count and simplifies control loop design. internal regulator the 5v internal regulator powers most of the internal circuitries. the regulator takes the v in and operates in the full v in range. when v in exceeds 5v, the output of the regulator is in full regulation. if v in is less than 5v, the output decreases with v in . the part requires a 0.1f ceramic decoupling capacitor. enable control (en) the MP2229 has a dedicated enable control pin (en). pull en high, or float, to enable the ic; pull en low to disable the ic. the en voltage is clamped to around 5.6v by an internal zener diode (see figure 2). a pull- up resistor is not needed to pull up the en voltage. if en is connected to a voltage source higher than 5v, a resistor is needed from the voltage source to en in order to limit the en input current to less than 100a. this helps prevent damage to the internal zener diode. for example, connecting 12v to en through a pull-up resistor, r pullup (12v ? 5.6v)/100a = 64k ? . connecting en directly to a voltage source without a pull-up resistor requires limiting the amplitude of the voltage source to below 5v to prevent damage to the internal zener diode. figure 2. zener diode between en and gnd setting the frequency and synchronizing connect a resistor from freq/sync to ground to set the switching frequency. the value of the frequency can be calculated approximately from: s freq 16000 f(khz) r(k)2.3 = + the frequency vs. r freq is shown in figure 3. figure 3. switching frequency vs r freq also, the MP2229 can be synchronized to an external clock with a range from 300khz to 2mhz through freq/sync. the
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 13 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. internal clock rising edge is synchronized to the external clock rising edge. low-power mode (lpm) the MP2229 has a low-power mode for light load. under a heavy-load condition, v comp is higher than v lpm . when the clock goes high, the hs-fet turns on and remains on until v ilsense reaches the value set by the comp voltage. the internal clock re-sets every time v comp is higher than v lpm . under a light-load condition, the value of v comp becomes low. when v comp is less than v lpm, and v fb is less than v ref , v comp ramps up until it exceeds v lpm . during this time, the internal clock is blocked. thus, the MP2229 skips pulses for pulse frequency modulation (pfm) mode, achieving the light-load power save (see figure 4). figure 4. simplified lpm control logic to enable low-power mode, connect lpm to vcc or to a voltage divider from vcc. when the external v lpm is higher than 1.2v, the MP2229 takes the internal v lpm . to disable low- power mode, connect lpm to ground, and the converter operates constantly in fixed frequency ccm. under-voltage lockout (uvlo) under-voltage lockout (uvlo) protects the chip from operating at an insufficient supply voltage. the MP2229 uvlo comparator monitors the output voltage of the internal regulator (vcc). the uvlo rising threshold is 4.1v while its falling threshold is 3.5v. external soft-start (ss) connect a capacitor from ss to ground to adjust the soft-start time. when the soft-start begins, an internal 10 a current source charges the external capacitor. the soft-start capacitor connects to the non-inverting input of the error amplifier. the soft-start period lasts until the voltage on the soft-start capacitor exceeds the 0.6v reference. at this point, the reference voltage takes over at the non- inverting error-amplifier input. the soft-start time can be calculated as follows: ss ss 0.6v c (nf) t(ms) 10 a = pre-bias start-up the MP2229 has been designed for a monotonic start-up into pre-biased loads. if the output is pre-biased to a certain voltage during start-up, the bst voltage is charged by v in . if bst voltage exceeds its rising threshold voltage, then the soft-start capacitor is charged. when the soft-start capacitor voltage exceeds the sensed output voltage at fb, the part starts to operate normally. over-current protection (ocp) the MP2229 has a cycle-by-cycle over-current limit, which limits the inductor current in case of an output over load or short circuit. if the over load or short circuit lasts for an extended period, the fb voltage can drop below the under- voltage (uv) threshold (40% of the reference, typically). once a uv is triggered, the MP2229 enters hiccup mode to re-start the part periodically. this protection mode is useful when the output is dead-shorted to ground. the average short-circuit current is reduced greatly to alleviate thermal issues and protect the regulator. the MP2229 exits hiccup mode once the over-current condition is removed. thermal shutdown (tsd) thermal shutdown prevents the chip from operating at exceedingly high temperatures. when the die temperature reaches 150c, it shuts down the whole chip. when the temperature falls below its lower threshold (120c, typically), the chip is enabled again. floating driver and bootstrap charging an external bootstrap capacitor powers the floating power mosfet driver. this floating driver has its own uvlo protection. the uvlo?s rising threshold is 2.03v with a hysteresis of 200mv. the bootstrap capacitor voltage is regulated internally by v in through d1, m1, r5, c5, l1, and c2 (see figure 5). if (v in - v sw ) exceeds 5v, u1 regulates m1 to maintain a 5v bst voltage across c5. a 10 o resistor
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 14 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. placed between sw and the bst capacitor is recommended strongly to reduce the sw spike voltage and noise. figure 5. internal bootstrap charging circuit start-up and shutdown if both v in and en exceed their respective thresholds, the chip is enabled. the reference block starts up first, generating a stable reference voltage, and then the internal regulator is enabled. the regulator provides a stable supply for the remaining circuitries. three events can shut down the chip: en low, v in low, and thermal shutdown. in shutdown, the signaling path is blocked first to avoid any fault triggering. the comp voltage and the internal supply rail are then pulled down.
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 15 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. application information component selection setting the output voltage the external resistor divider sets the output voltage (see ?typical application? on page 1). choose r1 around 20k ? , then r2 is: out r1 r2 v 1 0.6v = ? the t-type network is recommended highly (see figure 6). figure 6. t-type network table 1 lists the recommended t-type resistor values for common output voltages. table1. resistor selection for common output voltages (9) v out (v) r1 (k ? ) r2 (k ? ) rt (k ? ) 1.0 20 30 68 1.2 20 20 68 1.5 20 13.7 51 1.8 20 10 51 2.5 20 6.34 33 3.3 20 4.42 24 5 20 2.7 16 notes: 9) the recommended parameters are based on a 500khz switching frequency. a different input voltage, output inductors, and output capacitors may affect the recommended values of r1, r2, and rt. for additional component parameters, please refer to the ?typical application circuits? on pages 19-21. selecting the inductor for most applications, use a 1h to 10h inductor with a dc current rating at least 25% percent higher than the maximum load current. select an inductor with a dc resistance less than 15m ? for best efficiency. use the following equation to derive the inductor value for most designs: out in out 1 in l osc v(vv) l vif ? = where, i l is the inductor-ripple current. choose the inductor-ripple current to be approximately 30% of the maximum load current. the maximum inductor peak current is: 2 i ii l load )max(l += under light-load conditions (below 100ma), use a larger inductor for improved efficiency. setting the switching frequency an external resistor (r freq ) from freq/sync to gnd sets the MP2229 oscillating frequency. the value of r freq can be calculated approximately using the formula below: freq s 16000 r(k) -2.3 f(khz) = setting the lpm voltage the lpm voltage is used to set the transition point from lpm to ccm. choose a transition point that provides the best combination of efficiency, stability, ripple, and transient. if the lpm voltage is set lower than the recommended value (see figure 8), then stability and ripple improves but efficiency during lpm mode and transient degrades. likewise, if the lpm voltage is set higher, then the efficiency during lpm and transient improves, but stability and ripple degrades. calculate the optimal balance point of the lpm voltage for good efficiency, stability, and ripple. the lpm voltage comes from the tap of a resistor divider from v cc (5v) to gnd (see figure 7. figure 7. lpm network
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 16 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. generally, choose r6 to be around 100k ? , then r7 is: lpm cc lpm vr6 r7 vv = ? refer to figure 8 when setting the lpm voltage. 0.2 0.24 0.28 0.32 0.36 0.4 0246810 figure 8. recommended lpm selection for common output voltages (v in =12v, f s =500khz) selecting the input capacitor the input current to the step-down converter is discontinuous, and therefore requires a capacitor to supply the ac current while maintaining the dc input voltage. use low esr capacitors for the best performance. ceramic capacitors with x5r or x7r dielectrics are recommended highly because of their low esr and small temperature coefficients. for most applications, a 22f and a 10f capacitor are sufficient. since the input capacitor (c1) absorbs the input-switching current, it requires an adequate ripple-current rating. the rms current in the input capacitor can be estimated by: ? ? ? ? ? ? ? ? ? = in out in out load 1c v v 1 v v ii the worst-case condition occurs at v in = 2v out , where: load c1 i i 2 = for simplification, choose an input capacitor with a rms current rating greater than half of the maximum load current. the input capacitor can be electrolytic, tantalum, or ceramic. when using electrolytic or tantalum capacitors, place a small, high-quality ceramic capacitor (e.g. 0.1 f) as close to the ic as possible. when using ceramic capacitors, make sure that they have enough capacitance to provide sufficient charge in order to prevent excessive voltage ripple at the input. the input- voltage ripple caused by the capacitance can be estimated by: load out out in in si n iv v v1 fc1v v ?? = ? ?? ?? selecting the output capacitor the device requires an output capacitor (c2) to maintain the dc output voltage. use ceramic, tantalum, or low esr electrolytic capacitors. use low esr capacitors to limit the output- voltage ripple. estimate the output-voltage ripple with: out out out esr s1 in s vv 1 v1r fl v 8fc2 ?? ?? = ? + ?? ?? ?? ?? where l 1 is the inductor value and r esr is the equivalent series resistance (esr) value of the output capacitor. for ceramic capacitors, the impedance at the switching frequency is dominated by the capacitance. the output-voltage ripple is caused mainly by the capacitance. for simplification, the output-voltage ripple can be estimated by: out out out 2 in s1 vv v1 v 8f l c2 ?? = ? ?? ?? for tantalum or electrolytic capacitors, the esr dominates the impedance at the switching frequency. for simplification, the output ripple can be approximated to: out out out esr in s1 vv v1r fl v ?? =? ?? ?? the characteristics of the output capacitor affect the stability of the regulatory system. the MP2229 can be optimized for a wide range of capacitance and esr values.
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 17 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. external bootstrap diode bst voltage may become insufficient at particular specs (see conditions below). in these cases an external bootstrap diode can enhance the efficiency of the regulator at heavy load and avoid bst voltage insufficiency during pfm operation at light load. insufficient bst voltage is more likely to happen at either of the following conditions: z v in is below 5v z v out is 5v or 3.3v; and the duty cycle is large: d= in out v v >65% in these cases (if insufficient bst voltage occurs), the output-ripple voltage may become extremely high during a light-load condition. add an external bst diode from vcc to bst (see figure 9). figure 9. optional bootstrap diode the recommended external bst diode is in4148, and the bst capacitor is 0.1f to 1 f. pcb layout guidelines (10) efficient pcb layout is critical to achieve stable operation. for best results, please refer to figure 10 and follow the guidelines below: 1) keep the connection of input ground and gnd as short and wide as possible. 2) keep the connection of the input capacitor and in as short and wide as possible. 3) ensure all feedback connections are short and direct. place the feedback resistors and compensation components as close to the chip as possible. 4) route sw away from sensitive analog areas (such as fb). to improve performance, use a 4-layer board. figure 10 shows the top and bottom layer of the pcb (inner 1 and inner 2 are all gnd). notes: 10) the recommended layout is based on the figure 11 ?typical application circuit? on page19. top layer gnd vout vcc bottom layer figure 10. recommended pcb layout
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 18 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. design example table 2 below is a design example following the application guidelines for the specifications: table 2. design example v in 12v v out 1v i out 6a f s 500khz the detailed application schematics are shown in figure 11. the typical performance and circuit waveforms have been shown in the ?typical performance characteristics? section. for additional device applications, please refer to the related evaluation board datasheets.
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 19 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. typical application circuits (11) figure 11. v in =12v, f s =500khz, v out =1v,i out =6a figure 12. v in =12v, f s =500khz, v out =1.2v, i out =6a
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 20 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. figure 13. v in =12v, f s =500khz, v out =1.8v, i out =6a figure 14. v in =12v, f s = 500khz, v out =2.5v, i out =6a
MP2229 ? 21v, 6a synchronou s step-down converter MP2229 rev. 1.0 www.monolithicpower.com 21 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. figure 15. v in =12v, f s =500khz, v out =3.3v, i out =6a figure 16. v in =12v, f s =500khz, v out =5v, i out =6a notes: 11) for v out =3.3v application, when v in is lower than 5v and i out >5a, an additional input capacitor may be needed to reduce the input- voltage ripple for better stability. for v out =5v application, when v in is lower than 7v and i out >5a, an additional input capacitor may be needed to reduce the input-voltage ripple for better stability.
MP2229 ? 21v, 6a synchronou s step-down converter mps confidential and proprietary information? internal use only notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP2229 rev. 1.0 www.monolithicpower.com 22 2/12/2015 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2015 mps. all rights reserved. package information qfn-14 (3mmx3mm) 0 1) all dimensions are in millimeters. 2) exposed paddle size does not include mold flash. 3) lead coplanarity shall be 0.10 millimeters max. 4) jedec reference is mo-220. 5) drawing is not to scale. typ.

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