MPGC01-C123 6a, 21v, 600khz step-down converter with synchronous gate driver mps confidential proprietary information ? yec use only MPGC01-C123 rev. 0.9 www.monolithicpower.com 1 1/16/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. the future of analog ic technology description the MPGC01-C123 is a monolithic step-down switch mode converter with a built-in high-side power mosfet and a gate driver for low-side external mosfet. it achieves 6a continuous output current over a wide input supply range with excellent load and line regulation. current mode operation provides fast transient response and eases loop stabilization. fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. the MPGC01-C123 requires a minimum number of readily available standard external components and is available in an 8-pin soic package with exposed pad. features ? wide 5v to 21v operating input range ? 6a output current ? 45m ? internal power mosfet switch ? synchronous gate driver delivers up to 95% efficiency ? fixed 600khz frequency ? cycle-by-cycle over current protection ? thermal shutdown ? output adjustable from 0.8v to 15v ? stable with low esr output ceramic capacitors ? available in a thermally enhanced 8-pin soic package applications ? graphics cards ? distributed power systems ? ddr memory ? pre-regulator for linear regulators ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application MPGC01-C123 sw bg fb gnd bst in vcc en v out 1.8v/6a c4 0.1uf v in 5v-21v off on c1 22uf 25v c3 1uf 16v l1 4.7uh c2 100uf 6.3v efficiency vs output current 100 95 90 85 80 75 70 65 60 55 50 efficiency (%) 12 45 36 output current (a) v in =12v v in =20v v out =3.3v www.datasheet.co.kr datasheet pdf - http://www..net/
MPGC01-C123 ? 6a, 21v, 600khz step-dow n with synchronous gate driver mps confidential proprietary information ? yec use only MPGC01-C123 rev. 0.9 www.monolithicpower.com 2 1/16/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. package reference sw bst vcc bg in en fb gnd 1 2 3 4 8 7 6 5 top view exposed pad on backside part number* package temperature mpgc01dn ? c123 soic8n -40 c to +85 c * for tape & reel, add suffix ?z (e.g. mpgc01dn?c123?z) for rohs compliant packaging, add suffix ?lf (e.g. mpgc01dn?c123?lf?z) absolute maxi mum ratings (1) supply voltage v in ....................................... 23v v sw ....................................... ?0.3v to v in + 0.3v v bs ....................................................... v sw + 6v all other pins................................. ?0.3v to +6v junction temperature...............................150 c lead temperature ....................................260 c storage temperature ..............?65 c to +150 c recommended operating conditions (2) supply voltage v in .............................. 5v to 21v output voltage v out ........................ 0.8v to 15v operating temperature ..............-40 c to +85 c thermal resistance (3) ja jc soic8n .................................. 50 ...... 10... c/w notes: 1) exceeding these ratings may damage the device. 2) the device is not guaranteed to function outside of its operating conditions. 3) measured on approximately 1? square of 1 oz copper. electrical characteristics v in = 12v, t a = +25 c, unless otherwise noted. parameters symbol condition min typ max units feedback voltage v fb 5v v in 21v 0.790 0.810 0.830 v feedback current i fb v fb = 0.8v 10 na switch on resistance (4) r ds(on) 45 m
switch leakage v en = 0v, v sw = 0v 0 50 a current limit (4) 7.5 a oscillator frequency f sw v fb = 0.6v 480 600 khz fold-back frequency v fb = 0v 150 khz maximum duty cycle v fb = 0.6v 90 % minimum on time t on v fb = 1v 100 ns under voltage lockout threshold rising 3.70 4.05 4.60 v under voltage lockout threshold hysteresis 440 mv en input low voltage 0.4 v en input high voltage 1.2 v v en = 2v 2 en input current v en = 0v 0 a supply current (shutdown) v en = 0v 0 a supply current (quiescent) v en = 2v, v fb = 1v 1.5 ma thermal shutdown 150 c gate driver sink impedance r sink 1
gate driver source impedance r source 4
gate drive current sense trip threshold 20 mv note: 4) guaranteed by design. www.datasheet.co.kr datasheet pdf - http://www..net/
MPGC01-C123 ? 6a, 21v, 600khz step-dow n with synchronous gate driver mps confidential proprietary information ? yec use only MPGC01-C123 rev. 0.9 www.monolithicpower.com 3 1/16/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. pin functions pin # name description 1 sw switch output. 2 bst bootstrap. this capacitor is needed to dr ive the power switch?s gate above the supply voltage. it is connected between sw and bs pins to form a floating supply across the power switch driver. a 0.1 f capacitor is recommended for use. 3 vcc bg driver bias supply. decouple with a 1 f ceramic capacitor. 4 bg gate driver output. connect th is pin to the synchronous mosfet. 5 gnd ground. this pin is the voltage reference for the regulated output voltage. for this reason care must be taken in its layout. this node should be placed outside of the d1 to c1 ground path to prevent switching current spikes from inducing voltage noise into the part. 6 fb feedback. an external resistor divider from the output to gnd, tapped to the fb pin sets the output voltage. to prevent current limit run away during a short circuit fault condition the frequency foldback comparator lowers the oscillator frequency when the fb voltage is below 250mv. 7 en on/off control. 8 in supply voltage. the MPGC01-C123 operates from a +5v to +21v unregulated input. c1 is needed to prevent large voltage spikes from appearing at the input. www.datasheet.co.kr datasheet pdf - http://www..net/
MPGC01-C123 ? 6a, 21v, 600khz step-dow n with synchronous gate driver mps confidential proprietary information ? yec use only MPGC01-C123 rev. 0.9 www.monolithicpower.com 4 1/16/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics v in = 12v, v out = 2.5v, l = 2.2h, t a = +25oc, unless otherwise noted. v out 2v/div. v sw 2v/div. i l 5a/div. i l 5a/div. hiccup with outupt short circuit 1ms/div. startup through enable no load v out 2v/div. v en 5v/div. v en 5v/div. v sw 5v/div. i l 5a/div. input ripple voltage i out = 5a output ripple voltage i out = 5a load transient response i out = 1a to 4a step @ 1a/ s 1ms/div. startup through enable i out = 5a (resistive load) v sw 10v/div. v out 2v/div. i l 5a/div. 1ms/div. power up no load v in 5v/div. v out 2v/div. v sw 5v/div. v in,ac 100mv/div. v sw 5v/div. v out, ac 20mv/div. i l 5a/div. v sw 5v/div. v out,ac 100mv/div. i out 5a/div. close loop bode plot efficiency vs output current v out = 3.3v 100 95 90 85 80 75 70 65 60 55 50 efficiency (%) 1 0245 36 output current (a) v in =12v v in =20v 100 80 60 40 20 0 -20 -40 -60 -80 -100 100 80 60 40 20 0 -20 -40 -60 -80 -100 1k 10k 100k magnitude (db) phase (degree) magitude phase www.datasheet.co.kr datasheet pdf - http://www..net/
MPGC01-C123 ? 6a, 21v, 600khz step-dow n with synchronous gate driver mps confidential proprietary information ? yec use only MPGC01-C123 rev. 0.9 www.monolithicpower.com 5 1/16/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics v in = 12v, v out = 2.5v, l = 2.2h, t a = +25oc, unless otherwise noted. enabled supply current vs input voltage 1100 1050 1000 950 900 0 5 10 15 20 25 input voltage (v) 55 50 45 40 35 30 case temperature ( o c) 12 34 6 5 output current (a) 100 10 1 0.1 output voltage (v) 0 5 10 15 20 25 input voltage (v) 1.001 1.000 0.999 0.998 0.997 0.996 0.995 normalized output voltage 0123 5 7 9 46810 load current (a) case temperature vs output current operating range disabled supply current vs input voltage 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 5 10 15 20 25 input voltage (v) v cc regulator line regulation (i cc = 10ma) 4.9 4.7 4.5 4.3 4.1 3.9 3.7 3.5 v cc (v) 45 4.5 5.5 6 6.5 7 input voltage (v) v in =12v v in =20v load regulation 1.002 1.001 1.000 0.999 0.998 0.997 0.996 0.995 normalized output voltage 579 13 19 11 15 17 21 input voltage (v) i load =6a line regulation v o_max spec 1mhz 1.4mhz 600khz v fb_min d max limit www.datasheet.co.kr datasheet pdf - http://www..net/
MPGC01-C123 ? 6a, 21v, 600khz step-dow n with synchronous gate driver mps confidential proprietary information ? yec use only MPGC01-C123 rev. 0.9 www.monolithicpower.com 6 1/16/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. operation in en/sync fb sw vcc bg gnd bst regulator oscillator 600khz driver current sense amplifier error amplifier comp current limit comparator pwm comparator driver d regulator reference -- + -- + -- + s r r q q -- + 54pf 1pf v cc v cc figure 1?functional block diagram the MPGC01-C123 is a fixed frequency, synchronous, step-down switching regulator with an integrated high-side power mosfet and a gate driver for a low-side external mosfet. it achieves 6a continuous output current over a wide input supply range with excellent load and line regulation. it provides a single highly efficient solution with current mode control for fast loop response and easy compensation. the MPGC01-C123 operates in a fixed frequency, peak current control mode to regulate the output voltage. a pwm cycle is initiated by the internal clock. the integrated high-side power mosfet is turned on and 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, in 90% of one pwm period, the current in the power mosfet does not reach the comp set current value, the power mosfet will be forced to turn off. error amplifier the error amplifier compares the fb pin voltage with the internal 0.8v reference (ref) and outputs a current proportional to the difference between the two. this output current is then used to charge or discharge the internal compensation network to form the comp voltage, which is used to control the power mosfet current. the optimized internal compensation network minimizes the external component counts and simplifies the control loop design. internal regulator most of the internal circuitries are powered from the 5v internal regulator. this regulator takes the vin input and operates in the full vin range. when vin is greater than 5.0v, the output of the regulator is in full regulation. when vin is lower than 5.0v, the output decreases. since this internal regulator provides the bias current for the bottom gate driver that requires significant amount of current depending upon the external mosfet selection, a 1uf ceramic capacitor for decoupling purpose is required. enable/synch control www.datasheet.co.kr datasheet pdf - http://www..net/
MPGC01-C123 ? 6a, 21v, 600khz step-dow n with synchronous gate driver mps confidential proprietary information ? yec use only MPGC01-C123 rev. 0.9 www.monolithicpower.com 7 1/16/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. the MPGC01-C123 has a dedicated enable/synch control pin (en/sync). by pulling it high or low, the ic can be enabled and disabled by en. tie en to vin for automatic start up. to disable the part, en must be pulled low for at least 5 s. the MPGC01-C123 can be synchronized to external clock range from 300khz up to 1.4mhz through the en/sync pin. the internal clock rising edge is synchronized to the external clock rising edge. under-voltage lockout (uvlo) under-voltage lockout (uvlo) is implemented to protect the chip from operating at insufficient supply voltage. the MPGC01-C123 uvlo comparator monitors the output voltage of the internal regulator, vcc. the uvlo rising threshold is about 4.0v while its falling threshold is a consistent 3.2v. internal soft-start the soft-start is implemented to prevent the converter output voltage from overshooting during startup. when the chip starts, the internal circuitry generates a soft-start voltage (ss) ramping up from 0v to 1.2v. when it is lower than the internal reference (ref), ss overrides ref so the error amplifier uses ss as the reference. when ss is higher than ref, ref regains control. over-current-protection and hiccup the MPGC01-C123 has cycle-by-cycle over current limit when the inductor current peak value exceeds the set current limit threshold. meanwhile, output voltage starts to drop until fb is below the under-voltage(uv) threshold, typically 30% below the reference. once a uv is triggered, the MPGC01-C123 enters hiccup mode to periodically restart the part. this protection mode is especially useful when the output is dead-short to ground. the average short circuit current is greatly reduced to alleviate the thermal issue and to protect the regulator. the MPGC01-C123 exits the hiccup mode once the over current condition is removed. thermal shutdown thermal shutdown is implemented to prevent the chip from operating at exceedingly high temperatures. when the silicon die temperature is higher than 150 c, it shuts down the whole chip. when the temperature is lower than its lower threshold, typically 140 c, the chip is enabled again. floating driver and bootstrap charging the floating power mosfet driver is powered by an external bootstrap capacitor. this floating driver has its own uvlo protection. this uvlo?s rising threshold is 2.2v with a hysteresis of 150mv. the bootstrap capacitor voltage is regulated internally (figure 2). even at no load condition, as long as v in is 3v higher than v out , c4 will have enough voltage provided by v in through d1, m1, c4, l1 and c2. if (v in -v sw ) is more than 5v, u2 will regulate m1 to maintain a 5v bst voltage across c4. -- + -- + v in 5v u2 d1 m1 bst sw c4 c2 l1 v out figure 2 ? internal bootstrap charging circuit startup and shutdown if both vin and en are higher than their appropriate thresholds, the chip starts. the reference block starts first, generating stable reference voltage and currents, and then the internal regulator is enabled. the regulator provides stable supply for the remaining circuitries. three events can shut down the chip: en low, vin low and thermal shutdown. in the shutdown procedure, the signaling path is first blocked to avoid any fault triggering. the comp voltage and the internal supply rail are then pulled down. the floating driver is not subject to this shutdown command. www.datasheet.co.kr datasheet pdf - http://www..net/
MPGC01-C123 ? 6a, 21v, 600khz step-dow n with synchronous gate driver mps confidential proprietary information ? yec use only MPGC01-C123 rev. 0.9 www.monolithicpower.com 8 1/16/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. application information the schematic on the front page shows a typical mp8666 application. the ic can provide up to 6a output current at a nominal output voltage of 3.3v. for proper thermal performance, the exposed pad of the device must be soldered down to the printed circuit board. setting the output voltage the external resistor divider is used to set the output voltage (see the schematic on front page). the feedback resistor r1 also sets the feedback loop bandwidth with the internal compensation capacitor (see figure 1). choose r1 to be around 40.2k ? for optimal transient response. r2 is then given by: 1 v 8 . 0 v 1 r 2 r out ? = table 1?resistor selection for common output voltages v out (v) r1 (k ? ) r2 (k ? ) 1.8 40.2 (1%) 32.4 (1%) 2.5 40.2 (1%) 19.1 (1%) 3.3 40.2 (1%) 13 (1%) 5 40.2 (1%) 7.68 (1%) selecting the inductor a 1 h to 10 h inductor with a dc current rating of at least 25% percent higher than the maximum load current is recommended for most applications. for highest efficiency, the inductor dc resistance should be less than 15m ? . for most designs, the inductance value can be derived from the following equation. osc l in out in out f i v ) v v ( v l ? ? = where ? i l is the inductor ripple current. choose inductor current to be approximately 30% of the maximum load current, 8a. the maximum inductor peak current is: 2 i i i l load ) max ( l ? + = under light load conditions below 100ma, larger inductance is recommended for improved efficiency. synchronous mosfet the external synchronous mosfet is used to supply current to the inductor when the internal high-side switch is off. it significantly reduces the power loss when compared against a schottky rectifier. table 2 lists example synchronous mosfets and manufacturers. table 2?synchronous mosfet selection guide part no. manufacture fds6670as fairchild irf7821 international rectifier a04474 alpha & omega semiconductor selecting the input capacitor the input capacitor (c1) reduces the surge current drawn from the input 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 to the input. ceramic capacitors with x5r or x7r dielectrics are highly recommended because of their low esr and small temperature coefficients. for 8a output applications, a 22 f capacitor is sufficient. selecting the output capacitor the output capacitor (c2) keeps output voltage small and ensures regulation loop stability. the output capacitor impedance should be low at the switching frequency. ceramic capacitors with x5r or x7r dielectrics are recommended. pc board layout the high current paths (gnd, in and sw) should be placed very close to the device with short, direct and wide traces. the input capacitor needs to be as close as possible to the in and gnd pins. the external feedback resistors should be placed next to the fb pin. keep the switching node sw short and away from the feedback network. keep the en trace away from the feedback network, and also an isolation with ground trace between the en and fb pins (highly recommended). www.datasheet.co.kr datasheet pdf - http://www..net/
MPGC01-C123 ? 6a, 21v, 600khz step-dow n with synchronous gate driver mps confidential proprietary information ? yec use only MPGC01-C123 rev. 0.9 www.monolithicpower.com 9 1/16/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. external bootstrap diode it is recommended that an external bootstrap diode be added when the system has a 5v fixed input or the power supply generates a 5v output. this helps improve the efficiency of the regulator. the bootstrap diode can be a low cost one such as in4148 or bat54. MPGC01-C123 sw bst 10nf 5v figure 3?external bootstrap diode this diode is also recommended for high duty cycle operation (when in out v v >65%) and high output voltage (v out >12v) applications. www.datasheet.co.kr datasheet pdf - http://www..net/
MPGC01-C123 ? 6a, 21v, 600khz step-dow n with synchronous gate driver mps confidential proprietary information ? yec use only 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. MPGC01-C123 rev. 0.9 www.monolithicpower.com 10 1/16/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. package information soic8n (exposed pad) see detail "a" 0.0075(0.19) 0.0098(0.25) 0.050(1.27) bsc 0.013(0.33) 0.020(0.51) seating plane 0.000(0.00) 0.006(0.15) 0.051(1.30) 0.067(1.70) top view front view side view bottom view note: 1) control dimension is in inches. dimension in bracket is in millimeters. 2) package length does not include mold flash, protrusions or gate burrs. 3) package width does not include interlead flash or protrusions. 4) lead coplanarity (bottom of leads after forming) shall be 0.004" inches max. 5) drawing conforms to jedec ms-012, variation ba. 6) drawing is not to scale. 0.089(2.26) 0.101(2.56) 0.124(3.15) 0.136(3.45) recommended land pattern 0.213(5.40) 0.063(1.60) 0.050(1.27) 0.024(0.61) 0.103(2.62) 0.138(3.51) 0.150(3.80) 0.157(4.00) pin 1 id 0.189(4.80) 0.197(5.00) 0.228(5.80) 0.244(6.20) 14 85 0.016(0.41) 0.050(1.27) 0 o -8 o detail "a" 0.010(0.25) 0.020(0.50) x 45 o 0.010(0.25) bsc gauge plane www.datasheet.co.kr datasheet pdf - http://www..net/
|
