microsemi analog mixed signal group one enterprise , aliso viejo, ca. 92656 , 949 - 380 - 6100 , fax: 949 - 215 - 4996 product brief LX7167 ? 2 a step - down converter copyright ? 2010 rev. 2.4 11 / 3 / 2011 description high efficiency, ultra fast transient response regulator for mobile technology and system - on - chip (soc) processor application s LX7167 ? is a step - down pwm s witching regulator ic with integrated high side p - ch annel and low side n - channel mos fets. the ic operates using a proprietary hysteretic control topology with a full load operating frequency of 3mh z allowing small output filter components while maintaining excellent dynamic load response. the operational input voltage range of the lx7 167 is from 3v to 5.5v. the power save mode (psm) automatically transitions between pwm and psm mode depending on the load current. this allows the converters efficiency to remain high when load cur rent drops. a power good function indicate s the status of the ic (output voltage level compared to the power good threshold). in shutdown mode, current consumption is reduced to less than 1ua and the output capacitor is discharged. the LX7167 includes over current and short circuit protection. a cycle - by - c ycle current limit followed by a h iccup mode operation reduces the overall power dissipation of the internal mosfets and protects the ic during output shorts . the converter also incorporates thermal protection and internal digital soft start timing . k ey features benefits operational input supply voltage range: 3v - 5.5v ideal for 3.3v and 5v applications patented h ysteretic c ontrol t echnology increases speed providing ultra fast transient response ? eliminates loop error amplifier and compensation netw ork delay ? m inimizes filter components ? immediate response to load and line variation load current from 0 to 2a fast dynamic response supports demanding mobile computing requirements increased speed and reduced device bias currents ? eliminates bias capacito rs to support small footprint solutions essential in mobile applications ? maximizes efficiency with minimal power loss under all current levels and light load conditions ? increases battery life integrated pmos and nmos in a 2 x 2 mm package high integration minimizes pcb space and supports low profile package requirement designs applications ? mobile computing, notebook, netbook, ebook , tablets ? mobile communication , smart phone ? system - on - chip (soc) processor designs ? high performance hdd ? video cards ? poe p owered devices www.datasheet.co.kr datasheet pdf - http://www..net/
microsemi analog mixed signal group one enterprise , aliso viejo, ca. 92656 , 949 - 380 - 6100 , fax: 949 - 215 - 4996 2 a step - down converter LX7167 copyright ? 2010 rev. 2.4 11 / 3 / 2011 additional features ? pwm s witching at a c onstant 3 mhz ? automatic reduction of switching frequency to i mprove l ight l oad e fficiency ? input u nder v oltage and o ver v oltage p rotection ? dedicated enable control ? power good f unction ? internal soft - s tart ? cycle - by - cycle over current protection ? hiccup mode p rotects a gainst s hort c ircuit f aults ? 8l mlpd (2 x 2 mm) p ackage ? rohs compliant for pb free t y p i c a l a p p l i c a t i o n d y n a m i c l o a d r e s p o n s e a n d e f f i c i e ncy the LX7167 complements a complete family of high efficiency regulators for mobile products. see www.microsemi.com for a complete line of solutions. ? lx7 165: 5a step - down converter, (20 wclsp, 0.4mm pitch) ? lx7169: 3a step - down converter, (12l mlpd, 3.0 x 3.5 mm) a d d i t i o n a l i n f o r m a t i on ordering information t a ( ? c) l d 8l mlpd ( 2 x 2 mm) ? j a = 75 ? c/w rohs compliant / pb - free j unction to a mbient t hermal r esistance - 1 0 ? c to +85 ? c lx716 7 c ld junction temperature calculation: t j =t a + (p d x ? j a ) . the ? j a numbers are guidelines for the thermal performance of the device/pc - board system. the above assumes no ambient airflow. ? j a number above is with 4 - layer pc board. ava ilable in tape & reel. append the letters tr to the part number. contacts for more details and sample requests please contact your local area sales manager or field application engineer. more information can be found at www.microsemi.com or at (949) 380 - 6100 . dynamic transi ent response 0.5a to 1.5a ( 2* 22f, 0.68h) LX7167, 1.21v efficiency vs. output current (a) 1.5a 0.5a 1.7a/s 1.0a/s 2*(22f, x5r) LX7167 2* 76.8 k 150 k 0.68h 10 fb sw lx7157 gnd pvin vin=4.5~5.5v vout en vcc vout 1uf 3*(10uf,x5r) pgood pgood 0.47uh 100k 0.01uf 22uf x5r r1 33k 1% r2 66.5k 1% mode www.datasheet.co.kr datasheet pdf - http://www..net/
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