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mp1601 1a, synchronous, step-down converter with 11a quiescent current in sot563 mp1601 rev. 1.0 www.monolithicpower.com 1 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. the future of analog ic technology description the mp1601 is a monolithic, step-down, switch- mode converter with built-in, internal power mosfets. it can achieve 1a of continuous output current from a 2.3v-to-5.5v input voltage range with excellent load and line regulation. the output voltage can be regulated as low as 0.6v. the constant-on-time control scheme provides a fast transient response and eases loop stabilization. fault protections include cycle-by- cycle current limiting and thermal shutdown. the mp1601 is available in an ultra-small sot563 package and requires a minimal number of readily available, standard, external components. the mp1601 is ideal for a wide range of applications including high-performance dsps, wireless power, portable and mobile devices, and other low-power systems. features ? low quiescent current: 11 a ? 2.2mhz switching frequency ? en for power sequencing ? power good only for fixed output version ? wide 2.3v-to-5.5v operating input range ? output adjustable from 0.6v ? up to 1a of output current ? 160m ? and 120m ? internal power mosfet switches ? output discharging ? short-circuit protection (scp) with hiccup mode ? stable with low esr output ceramic capacitors ? 100% duty cycle ? available in a sot563 package applications ? wireless/networking cards ? portable and mobile devices ? battery-powered devices ? low-voltage i/o system power a ll mps parts are lead-free, halogen-free, and adhere to the rohs directive. for mps green status, please visit the mps website unde r quality assurance. ?mps? and ?the fu ture of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application mp1601 gnd fb vin c1 10 f en vin 5v vout 1.2v/1a sw c2 10 f r1 200k ? r2 200k ? en out l1 1 h
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 2 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. ordering information part number* package top marking v out range MP1601GTF sot563 see below adjustable MP1601GTF-12** see below fixed 1.2v MP1601GTF-15** see below fixed 1.5v MP1601GTF-18** see below fixed 1.8v MP1601GTF-25** see below fixed 2.5v MP1601GTF-33** see below fixed 3.3v * for tape & reel, add suffix ?z (e.g. MP1601GTF?z) ** contact factory for fixed output options. top marking (MP1601GTF) arb: product code of MP1601GTF y: year code lll: lot number top marking (MP1601GTF-12) auu: product code of MP1601GTF-12 y: year code lll: lot number top marking (MP1601GTF-15) aun: product code of MP1601GTF-15 y: year code lll: lot number
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 3 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. top marking (MP1601GTF-18) aup: product code of MP1601GTF-18 y: year code lll: lot number top marking (MP1601GTF-25) auq: product code of MP1601GTF-25 y: year code lll: lot number top marking (MP1601GTF-33) aur: product code of MP1601GTF-33 y: year code lll: lot number
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 4 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package reference top view top view fb gnd vin sw en out 1 2 34 5 6 pg gnd vin sw en out 1 2 34 5 6 MP1601GTF MP1601GTF-12 MP1601GTF-15 MP1601GTF-18 MP1601GTF-25 MP1601GTF-33 sot563 absolute maxi mum ratings (1) supply voltage (v in ) ....................................... 6v v sw ................................ -0.6v (-5v for <10ns) to 6v (8v for <10ns or 10v for <3ns) all other pins ..................................... -0.3v to 6v junction temperature ................................ 150c lead temperature ..................................... 260c continuous power dissipation (t a = +25c) (2) ???.?.. .................................................... 1w storage temperature ................ -65c to +150c recommended operating conditions (3) supply voltage (v in ) ........................ 2.3v to 5.5v operating junction temp. (t j ). .. -40c to +125c thermal resistance (4) ja jc sot563???????.......130??60.?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 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. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 5 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical characteristics v in = 3.6v, t j = -40c to +125c. typical value is tested at t j = +25c. the limit over temperature is guaranteed by characterization, unless otherwise noted. parameter symbol condition min typ max units feedback voltage (MP1601GTF only) v fb 2.3v v in 5.5v, t j = 25c 594 600 606 mv t j = -40c to +125c 588 612 fixed output voltage (7) only for MP1601GTF-12, i out =10ma, t j =+25 ? c 1.188 1.2 1.212 v only for MP1601GTF-12, i out =10ma, t j =-40c to +125c 1.176 1.2 1.224 v only for MP1601GTF-15, i out =10ma, t j =+25 ? c 1.485 1.5 1.515 v only for MP1601GTF-15, i out =10ma, t j =-40c to +125c 1.470 1.5 1.530 v only for MP1601GTF-18, i out =10ma, t j =+25 ? c 1.782 1.8 1.818 v only for MP1601GTF-18, i out =10ma, t j =-40c to +125c 1.764 1.8 1.836 v only for MP1601GTF-25, i out =10ma, t j =+25 ? c 2.475 2.5 2.525 v only for MP1601GTF-25, i out =10ma, t j =-40c to +125c 2.450 2.5 2.550 v only for MP1601GTF-33, i out =10ma, t j =+25 ? c 3.267 3.3 3.333 v only for MP1601GTF-33, i out =10ma, t j =-40c to +125c 3.234 3.3 3.366 v feedback current (MP1601GTF only) i fb v fb = 0.63v 50 100 na p-fet switch on resistance r dson p 160 m ? n-fet switch on resistance r dson n 120 m ? switch leakage current v en = 0v, v in = 6v, v sw = 0v and 6v, t j = 25c 0 1 a p-fet peak current limit sourcing 1.8 2.4 a n-fet valley current limit sourcing, valley current limit 1.5 a zcd 0 ma on time (MP1601GTF only) t on v in = 5v, v out = 1.2v 110 ns v in = 3.6v, v out = 1.2v 150
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 6 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical characteristics v in = 3.6v, t j = -40c to +125c. typical value is tested at t j = +25c. the limit over temperature is guaranteed by characterization, unless otherwise noted. parameter symbol condition min typ max units switching frequency f s v in = 5v, v out = 1.2v, i out = 500ma, t j = 25c (5) 1760 2200 2640 khz v in = 5v, v out = 1.2v, i out = 500ma, t j = -40c to +125c (5) 1650 2200 2750 khz minimum off time t min-off 60 ns minimum on time (5) t min-on 60 ns soft-start time t ss-on v out rise from 10% to 90% 0.5 ms under-voltage lockout threshold rising 2 2.25 v under-voltage lockout threshold hysteresis 150 mv en input logic low voltage 0.4 v en input logic high voltage 1.2 v output discharge resistor r dis v en = 0v, v out = 1.2v 1 k ? en input current v en = 2v 1.2 a v en = 0v 0 a supply current (shutdown) v en = 0v, t j = 25c 0 1 a supply current (quiescent) v en = 2v, v fb = 0.63v, v in = 3.6v, 5v, t j = 25c 11 13 a power good leakage current (MP1601GTF-xx only) i pg 50 100 na power good upper trip threshold (MP1601GTF-xx only) vo with respect to the regulation 90 % power good lower trip threshold (MP1601GTF-xx only) 85 % power good delay (MP1601GTF-xx only) 70 s power good sink current capability (MP1601GTF-xx only) sink 1ma 400 mv thermal shutdown (6) 160 c thermal hysteresis (6) 30 c notes: 5) guaranteed by characterization. 6) guaranteed by design. 7) without sleep mode.
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 7 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performance characteristics v in = 5v, v out = 1.2v, l = 1.0h, t a = +25c, unless otherwise noted. 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 50 55 60 65 70 75 80 85 90 95 100 0.001 0.01 0.1 1 line regulation ( ) -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 output current (a) 0 0.2 0.4 0.6 0.8 1 output current (a) output current (a) load regulation ( ) input voltage (v) load regulation vs. output current v out =3.3v v out =3.3v v out =2.5v v out =1.2v v out =1.2v v out =1.8v i out =0.15a i out =0.5a i out =1a line regulation vs. input voltage case temperature rise vs. output current case t emperature ris efficiency vs. output current 50 55 60 65 70 75 80 85 90 95 100 0.001 0.01 0.1 1 output current (a) efficiency vs. output current v in =3.3v v out =1.2v v out =2.5v v out =1.8v 1 1.5 2 2.5 3 current limit (a) -0.2 0 0.2 0.4 0.6 0.8 1 shutdown current ( a) 0 2 4 6 8 10 12 14 16 18 20 23456 23456 input voltage (v) quiescent current vs. input voltage 2345 6 input voltage (v) 23456 input voltage (v) shutdown current vs. input voltage v en =0v current limit vs. v in 0 2 4 6 8 10 12 v in =3.3v v in =5v
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 8 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performance characteristics (continued) v in = 5v, v out = 1.2v, l = 1.0h, t a = +25c, unless otherwise noted.
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 9 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performance characteristics (continued) v in = 5v, v out = 1.2v, l = 1.0h, t a = +25c, unless otherwise noted. v out /ac 50mv/div. v out /ac 100mv/div. v in 5v/div. i l 500ma/div. steady state without load steady state with 1a load v out 1v/div. v in 5v/div. v sw 5v/div. i l 1a/div. v out 1v/div. v in 5v/div. v sw 5v/div. i l 1a/div. v out 1v/div. v in 5v/div. v sw 5v/div. i l 1a/div. v in power up without load v in shut down without load v in power up with 1a load v in 5v/div. v sw 2v/div. i l 0.2a/div. v out /ac 20mv/div. v in 5v/div. v sw 2v/div. i l 0.2a/div. v out /ac 50mv/div. v in 5v/div. v sw 2v/div. i l 1a/div. steady state v in =3.6v, v out =3.3v, i out =0.05a, aam steady state v in =3.6v, v out =3.3v, i out =1a, aam steady state v in =3.6v, v out =3.3v, i out =0.25a, aam v sw 2v/div. v out /ac 10mv/div. v in 5v/div. i l 1a/div. v sw 2v/div. steady state v in =3.6v, v out =3.3v, i out =0a v out /ac 100mv/div. v in 5v/div. i l 0.2a/div. v sw 5v/div.
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 10 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performance characteristics (continued) v in = 5v, v out = 1.2v, l = 1.0h, t a = +25c, unless otherwise noted.
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 11 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performance characteristics (continued) v in = 5v, v out = 1.2v, l = 1.0h, t a = +25c, unless otherwise noted.
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 12 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. pin functions pin # name description 1 fb/pg MP1601GTF: feedback. a n external resistor divider from the output to gnd tapped to fb sets the output voltage. MP1601GTF-xx: power good indicator. the output of pg is an open-drain output. keep pg pulls up voltage is not more than vin. 2 gnd power ground. 3 vin supply voltage. the mp1601 operates on a +2.3v to +5.5v unregulated input. a decoupling capacitor is needed to prevent large voltage spikes from appearing at input. 4 sw output switching node. sw is the drain of the internal high-side p-channel mosfet. connect the inductor to sw to complete the converter. 5 en on/off control. 6 out output voltage power rail and input sense. connect the load to out. an output capacitor is needed to decrease the output voltage ripple.
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 13 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. block diagram figure 1: functional block diagram note: option 1) fb is only for the MP1601GTF option 2) pg is only for the MP1601GTF-xx
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 14 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. operation the mp1601 uses constant-on-time control with an input voltage feed-forward to stabilize the switching frequency over the full input range. it achieves 1a of continuous output current from a 2.3v-to-5.5v input voltage range with excellent load and line regulation. the output voltage can be regulated as low as 0.6v. constant-on-time control compared to fixed-frequency pwm control, constant-on-time control offers a simpler control loop and a faster transient response. by using an input voltage feed-forward, the mp1601 maintains a nearly constant switching frequency across the input and output voltage ranges. the switching pulse on time can be estimated with equation (1): out on in v t0.454s v ?? ? (1) to prevent inductor current runaway during the load transient, the mp1601 uses a fixed minimum off time of 60ns. sleep mode operation the mp1601 uses sleep mode to achieve high efficiency at extremely light loads. in sleep mode, most of the circuit blocks are turned off, except the error amplifier and the pwm comparator. therefore, the operating current is reduced to a minimal value (see figure 2). figure 2: operation blocks in sleep mode when the load becomes lighter, the output voltage ripple is bigger and drives the error amplifier output (eao) lower. when the eao hits an internal low threshold, it clamps at that level, and the mp1601 enters sleep mode. during sleep mode, the valley of the fb voltage is regulated to the internal reference voltage, making the average output voltage slightly higher than the output voltage at dcm or ccm. the on-time pulse in sleep mode is around 40% larger than that in dcm or ccm. figure 3 shows the average fb voltage relationship with the internal reference at sleep mode. figure 3: fb average voltage at sleep mode when the mp1601 is in sleep mode, the average output voltage is higher than the internal reference voltage. the eao is kept low and clamped in sleep mode. when the loading increases, the pwm switching period decreases to keep the output voltage regulated, and the output voltage ripple decreases as well. once the eao is higher than the internal low threshold, the mp1601 exits sleep mode and enters dcm or ccm, depending on the load. in dcm or ccm, the eao regulates the average output voltage to the internal reference (see figure 4). figure 4: dcm control there is always a loading hysteresis when entering and exiting sleep mode due to the error amplifier clamping response time. aam operation at light-load operation the mp1601 uses an advanced asynchronous modulation (aam) power-save mode with a zero-current cross detection (zcd) circuit for light loads. the mp1601 uses aam power-save mode in light loads (see figure 5). the aam current (i aam ) is set internally. the sw on pulse time is decided by an on-time generator and aam comparator. at light-load condition, the sw on the pulse time is stretched. the aam comparator pulse is longer than the on-time generator. the mode of operation is below in figure 6.
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 15 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. hs_ driver vref vfb cot generator en iaam il_ sense r sq fbcomp aamcomp figure 5: simplified aam control logic figure 6: aam comparator control t on the aam comparator pulse is shorter than the on-time generator. the mode of operation is shown below in figure 7. this usually occurs when using a very small inductance. figure 7: on-time control (t on ) besides the upper on-time method, the aam circuit has another 150ns aam blank time in sleep mode. if the on-timer is less than 150ns, the high-side mosfet may turn off after the on-time generator pulse without aam control. the on-time pulse at sleep mode is around 40% larger than that in dcm or ccm. in this condition, i l may not reach the aam threshold (see figure 8). figure 8: aam blank time in sleep mode figure 9 shows the aam threshold decreasing and t on increasing gradually. for ccm state, i out requires more than half of the aam threshold. figure 9: aam threshold decreases with t on increasing the mp1601 uses zcd to detect if the inductor current begins reversing. when the inductor current reaches the zcd threshold, the low-side switch is turned off. aam mode and the zcd circuit together cause the mp1601 to work in dcm in light load continuously, even if v out is close to v in . enable (en) when the input voltage is greater than the under-voltage lockout (uvlo) threshold (typically 2v), the mp1601 can be enabled by pulling en higher than 1.2v. floating en or pulling it down to ground disables the mp1601. there is an internal 1m ? resistor from en to ground. when the device is disabled, the mp1601 goes into output discharge mode automatically. its internal discharge mosfet provides a resistive discharge path for the output capacitor. soft start (ss) the mp1601 has a built-in soft start that ramps up the output voltage at a controlled slew rate to avoid overshooting at start-up. the soft start time is about 0.5ms, typically.
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 16 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. power good indictor (only for the MP1601GTF-xx) the mp1601 has an open drain and requires an external pull-up resistor between 100k ? ~500k ? for the power good indicator. (note: keep pg pulls up voltage is not more than vin). when v fb is within -10% of regulation voltage, v pg is pulled up to v in by the external resistor. if v fb exceeds the -10% window, the internal mosfet pulls pg to ground. the mosfet has a maximum r ds(on) of less than 400 ? . current limit the mp1601 has a 2.4a high-side switch current limit, typically. when the high-side switch reaches its current limit, the mp1601 remains in hiccup mode until the current drops. this prevents the inductor current from continuing to rise and damaging components. short circuit and recovery the mp1601 enters short-circuit protection mode when it reaches the current limit and attempts to recover with hiccup mode. in this process, the mp1601 disables the output power stage, discharges the soft-start capacitor, and then attempts to soft start again automatically. if the short-circuit condition remains after the soft- start ends, the mp1601 repeats this cycle until the short-circuit disappears and the output rises back to regulation level.
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 17 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. application information setting the output voltage (only for MP1601GTF) the external resistor divider sets the output voltage (see the typical application circuit on figure 12 ). select the feedback resistor (r1), typically between 40k ? to 200k ? , to reduce the vout leakage current. there is no strict requirement on the feedback resistor. r1 > 10k ? is reasonable for most applications. calculate r2 with equation (2): out r1 r2 v 1 0.6 ? ? (2) figure 10 shows the feedback circuit. figure 10: feedback network table 1 lists the recommended resistor values for common output voltages. table 1: resistor values for common output voltages v out (v) r1 (k ? ) r2 (k ? ) 1.0 200 (1%) 300 (1%) 1.2 200 (1%) 200 (1%) 1.8 200 (1%) 100 (1%) 2.5 200 (1%) 63.2 (1%) 3.3 200 (1%) 44.2 (1%) selecting the inductor most applications work best with a 0.47h-to- 2.2h inductor. select an inductor with a dc resistance below 50m ? to optimize efficiency. a high-frequency switch mode power supply with a magnetic device has a strong, electronic, magnetic inference for the system. any un- shielded power inductor should be avoided. metal alloy or multiplayer chip power inductors are ideal shielded inductors for the application of the emi as they can decrease the influence effectively. table 2 lists some recommended inductors. table 2: suggested inductor list manufacturer p/n inductance ( h ) manufacturer pife25201b-1r0ms 1.0 cyntec co. ltd 1239as-h-1r0m 1.0 tokyo 74438322010 1.0 wurth for most designs, the inductance value can be calculated with equation (3): out in out 1 in l osc v(vv) l vif ?? ? ?? ? (3) where ? i l is the inductor ripple current. choose the inductor current to be approximately 30% of the maximum load current. the maximum inductor peak current can be calculated with equation (4): l l(max) load i ii 2 ? ?? (4) selecting the input capacitor the input current to the step-down converter is discontinuous and therefore requires a capacitor to supply ac current to the step-down converter while maintaining the dc input voltage. for best performance, use low esr capacitors. ceramic capacitors with x5r or x7r dielectrics are highly recommended because of their low esr and small temperature coefficients. for most applications, a 10f capacitor is sufficient. higher output voltages may require a 22 f capacitor to increase system stability. the input capacitor requires an adequate ripple current rating because it absorbs the input switching current. estimate the rms current in the input capacitor with equation (5): out out c1 load in in vv ii 1 vv ?? ?? ? ?? ?? ?? ?? ? (5) the worst case occurs at v in = 2v out , shown in equation (6): load c1 i i 2 ? (6) for simplification, choose an input capacitor with an rms current rating greater than half of the maximum load current.
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 18 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. the input capacitor can be electrolytic, tantalum, or ceramic. when using electrolytic or tantalum capacitors, add a small, high-quality ceramic 0.1 f capacitor as close to the ic as possible. when using ceramic capacitors, ensure that they have enough capacitance to provide a sufficient charge to prevent excessive voltage ripple at the input. the input voltage ripple caused by capacitance can be estimated with equation (7): load out out in in sin iv v v1 fc1v v ?? ?? ? ?? ?? ? ?? (7) selecting the output capacitor the output capacitor (c2) stabilizes the dc output voltage. ceramic capacitors are recommended. for best results, use low esr capacitors to limit the output voltage ripple. the output voltage ripple can be estimated with equation (8): out out out esr s1 in s vv 1 v1r fl v 8fc2 ?? ?? ?? ?? ? ? ?? ?? ??? ?? ?? (8) where l 1 is the inductor value and r esr is the equivalent series resistance (esr) value of the output capacitor. when using ceramic capacitors, the capacitance dominates the impedance at the switching frequency and causes most of the output voltage ripple. for simplification, the output voltage ripple can be estimated with equation (9): out out out 2 s1 in vv ? v1 8f l c2 v ?? ??? ?? ??? ?? (9) for tantalum or electrolytic capacitors, the esr dominates the impedance at the switching frequency. for simplification, the output ripple can be approximated with equation (10): out out out esr in s1 vv ? v1r fl v ?? ???? ?? ? ?? (10) the characteristics of the output capacitor also affect the stability of the regulation system. pcb layout guidelines efficient pcb layout is critical for stable operation. for the high-frequency switching converter, a poor layout design can result in poor line or load regulation and stability issues. for best results, refer to figure 11 and follow the guidelines below. 1. place the high-current paths (gnd, in, and sw) very close to the device with short, direct, and wide traces. 2. place the input capacitor as close to in and gnd as possible. 3. place the external feedback resistors next to fb. 4. keep the switching node sw short and away from the feedback network. 5. keep the v out sense line as short as possible or keep it away from the power inductor. figure 11: two ends of the input decoupling capacitor close to pin 2 and pin 3
mp1601 ? 1a, synchronous, step-down converter with 11a i q mp1601 rev. 1.0 www.monolithicpower.com 19 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical application circuits figure 12: typical application circuit for the MP1601GTF note: v in < 3.3v may need more input capacitors figure 13: typical application circuit for the MP1601GTF-xx note: 1) v in < 3.3v may need more input capacitor 2) v in > v out for application
mp1601 ? 1a, synchronous, step-down converter with 11a i q 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. mp1601 rev. 1.0 www.monolithicpower.com 20 3/24/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package information sot563

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