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| EP5368QI 600ma synchronous buck regulator with integrated inductor 3mm x 3mm x 1.1mm package april 2008 rohs compliant halogen free featuring integrated inductor technology product highlights ? integrated inductor ? 3mm x 3mm x 1.1 mm qfn package ? only two low cost mlcc caps required ? 4 mhz switching frequency ? high efficiency, up to 94% ? up to 700ma continuous output current ? wide 2.4v to 5.5v input range ? v out range 0.603v to v in ? 0.4v ? 100% duty cycle capable ? less than 1 a standby current ? low v out ripple for rf compatibility ? short circuit and over current protection ? uvlo and thermal protection ? stable over entire operating range ? rohs compliant; msl 3 260c reflow typical application circuit v in v sense v in v s1 v s2 v s0 EP5368QI 22 f 0805 4.7 f 0603 v out v out gnd enable v fb voltage select figure 1. typical application circuit. product overview the EP5368QI is a synchronous buck converter with integrated inductor, pwm controller, mosfets, and compensation providing the smallest possible solution size. the EP5368QI requires only two small mlcc capacitors to make a complete solution. integration of the induc tor greatly simplifies design, contains noise, reduces part count, and reduces solution footpr int. low output ripple ensures compatibilit y with rf systems. the EP5368QI operates at a switching frequency of 4 mhz, enabling this unprecedented level of integration and small external components. type iii voltage mode control is used to provide high noise immunity and wide control loop bandwidth. the device is stable over all input and output voltages . it can source 600ma of current over the industrial temperature range and up to 700ma over the commercial temperature range. the small footprint makes this part ideal for space constrained por table applications. shutdown current of <1ua extends battery life output voltage level is programmed via a 3-pin vid selector providing seven pre-programmed output voltages along with an option for external resistor divider. applications ? noise sensitive rf applications ? area constrained applications ? smart phones and pdas ? portable gaming devices ? personal media players ? advanced mobile processors, dsp, io, memory, video, multimedia engines
april 2008 EP5368QI ? enpirion 2008 all rights reserved, e&oe 2 www.enpirion.com pin description figure 2. EP5368QI package pin-out. nc (pins 1,3,9,15,16): t hese pins should not be electrically connected to each other or to any external signal, vo ltage, or ground. one or more of these pins may be connected internally. pgnd : (pin 2): power ground. v fb (pin 4): feed back pin for external divider option. when using the external divider option (vs0=vs1=vs2= high) connect this pin to the center of the external divider. set the divider such that v fb = 0.6v. the ?ground? side of the external divider should be connected to agnd. v sense (pin 5): sense pin for preset output voltages. when using preset voltages connect this to v load or as close to v load as possible to ensure the best regulation. when using external divider, connect this pin to v out. agnd : (pin 6):analog ground. this is the quiet ground for the internal control circuitry v out (pin 7,8): regulated output voltage. vs0,vs1,vs2 (pin 10, 11, 12): output voltage select. vs2=pin10 vs1=pin11, vs0=pin12. selects one of seven pr eset output voltages or choose external divider by connecting pins to logic high or low. logic low is defined as v low 0.4v. logic hi gh is defined as v high 1.4v. any level between these two values is indeterminate. (refer to section on output voltage select for more detail). enable (pin 13): output enable. enable = logic high, disable = logic low. logic low is defined as v low 0.4v. logic high is defined as v high 1.4v. any level between these two values is indeterminate. v in (pin 14): input voltage pin. supplies power to the ic. vin can rang e from 2.4v to 5.5v. april 2008 EP5368QI ? enpirion 2008 all rights reserved, e&oe 3 www.enpirion.com functional block diagram voltage select dac switch vref (+) (-) error amp v sense v fb v out vs0 vs1 vs2 package boundry p-drive n-drive uvlo thermal limit current limit soft start sawtooth generator (+) (-) pwm comp v in enable gnd logic compensation network nc(sw) figure 3. functional block diagram. april 2008 EP5368QI ? enpirion 2008 all rights reserved, e&oe 4 www.enpirion.com absolute maximum ratings caution: absolute maximum ratings are stre ss ratings only. functional operation beyond recommended operating conditions is not implied. stress beyond absolute maximum ratings may cause permanent damage to the device. exposure to absolute maximum rated conditions for extended periods may affect device reliability. parameter symbol min max units input supply voltage v in -0.3 7.0 v voltages on: enable, v sense , v s0 -v s2 -0.3 v in + 0.3 v voltage on: v fb -0.3 2.7 v storage temperature range t stg -65 150 c reflow temp, 10 sec, msl3 jedec j-std-020c 260 c esd rating (based on human body model) 2000 v recommended operating conditions parameter symbol min max units input voltage range v in 2.4 5.5 v operating ambient temperature t a -40 +85 c operating junction temperature t j -40 +125 c thermal characteristics parameter symbol typ units thermal resistance: junction to ambient (0 lfm) ja 100 c/w thermal overload trip point t j-tp +150 c thermal overload trip point hysteresis 15 c electrical characteristics note: t a = -40c to +85c unless otherwise noted. typical values are at t a = 25c, v in = 3.6v. c in = 4.7 f 0603 mlcc, c out = 22uf 0805 mlcc. parameter symbol test conditions min typ max units operating input voltage v in 2.4 5.5 v output voltage (presets) (vs pins must not be left floating) v o vs2 vs1 vs0 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 v out 3.3 2.5 1.8 1.5 1.25 1.2 0.8 ext. v output voltage (external divider) v o 0.6 v in -0.4 v dynamic voltage slew rate v slew 1.5 mv/ s continuous output current i out v in = 5v, 0.603v april 2008 EP5368QI ? enpirion 2008 all rights reserved, e&oe 6 www.enpirion.com startup, v in = 3.6v, v out = 1.5v, load = 500ma shutdown, v in = 3.6v, v out = 1.5v, load = 500ma voltage ripple, v in = 3.3v, v out = 1.8v, load = 0ma voltage ripple, v in = 3.3v, v out = 1.8v, load = 600ma c out = 1x 22uf 0805, 2.0mv/div. c out = 1x 22uf 0805, 2.0mv/div. voltage ripple, v in = 3.3v, v out = 1.8v, load = 0ma voltage ripple, v in = 3.3v, v out = 1.8v, load = 600ma c out = 2x 10uf 0805, 2.0mv/div. c out = 2x 10uf 0805, 2.0mv/div. detailed description april 2008 EP5368QI ? enpirion 2008 all rights reserved, e&oe 7 www.enpirion.com functional overview the EP5368QI is a complete dcdc converter solution requiring only two low cost mlcc capacitors. mosfet switches, pwm controller, gate-drive, compensation, and inductor are integrated into the tiny 3mm x 3mm x 1.1mm package to provide the smallest footprint possible wh ile maintaining high efficiency, low ripple, and high performance. the converter uses voltage mode control to provide the simplest implementation and high noise immunity. the device operates at a 4mhz switching frequen cy. the high switching frequency allows for a wide control loop bandwidth providing ex cellent transient performance. the high switching frequency further enables the use of very small components making possible this unprecedented level of integration. enpirion?s proprietary power mosfet technology provides very low switching loss at frequencies of 4 mhz and higher, allowing for the use of very small internal components, and high performance. int egration of the magnetics virtually eliminates t he design/layout issues normally associated wit h switch-mode dcdc converters. all of this enables much easier and faster incorporation into various applications to m eet demanding emi requirements. output voltage is chosen from seven preset values via a three pi n vid voltage select scheme. an external divider option enables the selection of any voltage in v in to 0.6v range. this reduces the number of components that must be qualified and reduces inventory burden. the vid pins can be toggled on the fly to implement glitch free dynamic voltage scaling. protection features in clude under-voltage lock- out (uvlo), over-current protection (ocp), short circuit protection, and thermal overload protection. integrated inductor enpirion has introduc ed the world?s first product family featuring integrated inductors. the EP5368QI utilizes a proprietary low loss integrated inductor. t he use of an internal inductor localizes the noises associated with the output loop currents. the inherent shielding and compact construction of the integrated inductor reduces the radiated noise that couples into the traces of the circuit board. further, the package layo ut is optimized to reduce the electrical path length for the ac ripple currents that are a major source of radiated emissions from dcdc converters. the integrated inductor significantly reduces parasitic effects that can harm loop stability, and makes layout very simple. stable over wide range of operating conditions the EP5368QI utilizes an internal type iii compensation network and is designed to provide a high degree of stability over a wide range of operating conditi ons. the device operates over the entire input and output voltage range with no exte rnal modifications required. the very high switching frequency allows for a very wide control loop bandwidth. soft start internal soft start circuits limit in-rush current when the device starts up from a power down condition or when the ?enable? pin is asserted ?high?. digital control circuitry limits the v out ramp rate to levels that are safe for the power mosfets and the integrated inductor. the soft start ramp rate is nominally 1.5v/ms. april 2008 EP5368QI ? enpirion 2008 all rights reserved, e&oe 8 www.enpirion.com over current/short circuit protection the current limit function is achieved by sensing the current flowing through a sense p- mosfet which is compared to a reference current. when this leve l is exceeded the p- fet is turned off and the n-fet is turned on, pulling v out low. this condition is maintained for a period of 1ms and then a normal soft start is initiated. if the ov er current condition still persists, this cycle will repeat in a ?hiccup? mode. under voltage lockout during initial power up an under voltage lockout circuit will hold-off the switching circuitry until the in put voltage reaches a sufficient level to insure proper operation. if the voltage drops below the uvlo threshold the lockout circuitry will again disable the switching. hysteresis is included to prevent chattering between states. enable the enable pin provides a means to shut down the converter or enable normal operation. a logic low wil l disable the converter and cause it to shut down. a logic high will enable the converter into normal operation. in shutdown mode, the devic e quiescent current will be less than 1 ua. note: this pin must not be left floating. thermal shutdown when excessive power is dissipated in the chip, the junction temperature rises. once the junction temperature exceeds the thermal shutdown temperature t he thermal shutdown circuit turns off the co nverter output voltage thus allowing the device to cool. when the junction temperature decreases by 15c , the device will go through the normal startup process. application information output voltage select to provide the highest degree of flexibility in choosing output voltage, the EP5368QI uses a 3 pin vid, or voltage id , output voltage select arrangement. this allows the designer to choose one of seven preset voltages, or to use an external voltage divider. internally, the output of the vid multiplexer sets the value for the voltage reference dac, which in turn is connected to the non-inverting input of the error amplifier. this a llows the use of a single feedback divider with constant loop gain and optimum compensation, independent of the output voltage selected. table 1 shows the vari ous vs0-vs2 pin logic states and the associ ated output voltage levels. a logic ?1? in dicates a connection to v in or to a ?high? logic voltage level. a logic ?0? indicates a connection to ground or to a ?low? logic voltage level. these pins can be either hardwired to v in or gnd or alternatively can be driven by standard logic levels. logic low is defined as v low 0.4v. logic high is defined as v high 1.4v. any level between these two values is indeterminate. these pins must not be left floating. vs2 vs1 vs0 v out 0 0 0 3.3v 0 0 1 2.5v 0 1 0 1.8v 0 1 1 1.5v 1 0 0 1.25v 1 0 1 1.2v 1 1 0 0.8v 1 1 1 user selectable table 1. vid voltage select settings. april 2008 EP5368QI ? enpirion 2008 all rights reserved, e&oe 9 www.enpirion.com external voltage divider as described above, the external voltage divider option is chosen by connecting the vs0, vs1, and vs2 pins to vin or logic ?high?. the EP5368QI uses a separate feedback pin, v fb , when using the external divider. vsense must be connected to v out as indicated in figure 4. v in v sense v in v s1 v s2 v s0 EP5368QI 22 f 0805 4.7uf 0603 v out v out gnd enable ra rb v fb figure 4. external divider application circuit. the output voltage is sele cted by the following formula: () rb ra out v v + = 1 603 . 0 r a must be chosen as 200k ? to maintain loop gain. then r b is given as: ? ? = 603 . 0 10 206 . 1 5 out b v x r v out can be programmed ov er the range of 0.603v to v in -0.4v. dynamically adjustable output the EP5368QI is designed to allow for dynamic switching be tween the predefined vid voltage levels the inter-voltage slew rate is optimized to prevent excess undershoot or overshoot as the out put voltage levels transition. the slew rate is identical to the soft- start slew rate of 1.5v/ms. dynamic transitioning between internal vid settings and the external divider is not allowed. input and output capacitors the input capacitance requi rement is 4.7uf 0603 mlcc. the input capacitor must be a x5r/x7r mlcc. y5v or equivalent dielectric formulations lose capacitance with frequency, bias, and with temperature, and are not suitable for switch-mode dc-dc converter input filter applications. the output capacitance requirement is approximately 20uf. enpirion recommends a single 22uf 0805 mlcc. ripple performance can be improved by using 2 x 10uf 0805 mlc capacitors. the output capacitor mu st be a x5r/x7r or equivalent mlcc. y5v or equivalent dielectric formulations lose capacitance with frequency, bias, and temperature and are not suitable for switch-mode dc-dc converter output filter applications. please consult enpirion applications support for other capacitor case size combinations. operation at 700ma output current operation at 700ma is supported by using the application circuit shown in figure 5. the modification in the compensation is to ensure stability over the entire set of input and output voltage conditions. v in v sense v in v s1 v s2 v s0 EP5368QI 22 f 0805 4.7uf 0603 v out v out gnd enable ra rb v fb c a figure 5. applications circuit for operation at 700ma. april 2008 EP5368QI ? enpirion 2008 all rights reserved, e&oe 10 www.enpirion.com for 700ma operation, use the following component values: r a = 249k ? . ca = 15pf 0402 mlcc capacitor. then r b is given as: ? ? = 603 . 0 10 501 . 1 5 out b v x r v out can be programmed ov er the range of 0.603v to v in -0.4v. stability cannot be assur ed if these guidelines are not followed. recommended pcb footprint april 2008 EP5368QI ? enpirion 2008 all rights reserved, e&oe 11 www.enpirion.com package dimensions april 2008 EP5368QI ? enpirion 2008 all rights reserved, e&oe 12 www.enpirion.com contact information enpirion, inc. 685 us route 202/206 suite 305 bridgewater, nj 08807 phone: +1 908-575-7550 fax: +1 908-575-0775 enpirion reserves the right to make changes in circuit design and/or specif ications at any time without notice. information fur nished by enpirion is believed to be accurate and reliable. enpirion assumes no responsib ility for its use or for infringement of patents or other th ird party rights, which may result from its use. enpirion products are not authorized for us e in nuclear control systems, as critical components in life su pport systems or equipment used in hazardous environment without the ex press written authority from enpirion. |
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