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f an2001/fan2002 rev. 1.0.2 1 www.fairchildsemi.com april 2005 ?005 fairchild semiconductor corporation f an2001/fan2002 1a high-ef?iency step-down dc-dc converter f an2001/fan2002 1a high-ef?iency step-down dc-dc converter features 96% ef?iency, synchronous operation adjustable output voltage options from 0.8v to v in 2.5v to 5.5v input voltage range up to 1a output current fixed frequency 1.3mhz pwm operation high ef?iency power save mode 100% duty cycle low dropout operation soft start output over-voltage protection dynamic output voltage positioning 25 a quiescent current thermal shutdown and short circuit protection pb-free 3x3mm 6-lead mlp package applications pock et pcs, pdas cell phones battery-powered portable devices digital cameras hard disk drives set-top-boxes p oint-of-load power notebook computers communications equipment description designed for use in battery-powered applications, the FAN2001/ f an2002 is a high-ef?iency, low-noise synchronous pwm cur- rent mode and pulse skip (power save) mode dc-dc con- ve r ter. it can provide up to 1a of output current over a wide input r ange from 2.5v to 5.5v. the output voltage can be externally adjusted over a wide range of 0.8v to 5.5v by means of an e xternal voltage divider. at moderate and light loads, pulse skipping modulation is used. dynamic voltage positioning is applied, and the output voltage is shifted 0.8% above nominal value for increased headroom dur- ing load transients. at higher loads the system automatically s witches over to current mode pwm control, operating at 1.3 mhz. a current mode control loop with fast transient response ensures excellent line and load regulation. to achieve high ef? ciency and ensure long battery life, the quiescent current is reduced to 25? in power save mode, and the supply current drops below 1? in shut-down mode. the FAN2001/fan2002 is av ailable in a 3x3mm 6-lead mlp package. t ypical application figure 1. typical application 1 2 3 6 5 4 fb pgnd sw pv in v in en p1 (a gnd) l1 r2 r1 v out 2 x 10 f 3.3 h 10 f 10k ? 5k ? 1.2v (1a) fan2002 2 x 10 f 10 f v out en sw c in c out 1.2v (1a) 1 2 3 6 5 4 fb pgnd v in nc p1 (a gnd) 3.3 h r1 10k ? 5k ? r2 FAN2001
2 www.fairchildsemi.com f an2001/fan2002 rev. 1.0.2 f an2001/fan2002 1a high-ef?iency step-down dc-dc converter pin assignment figure 2. pin assignment pin description FAN2001 (3x3mm 6-lead mlp) fan2002 (3x3mm 6-lead mlp) pin no. pin name pin description p1 agnd analog ground. p1 must be soldered to the pcb ground. 1v in supply voltage input. 2 pgnd power ground. this pin is connected to the internal mosfet switches. this pin must be e xternally connected to agnd. 3e n enable input. logic high enables the chip and logic low disables the chip, reducing the supply current to less than 1?. do not ?at this pin. 4 fb feedback input. adjustable voltage option, connect this pin to the resistor divider. 5n c no connection pin. 6s w switching node. this pin is connected to the internal mosfet switches. pin no. pin name pin description p1 agnd analog ground. p1 must be soldered to the pcb ground. 1f b feedback input. adjustable voltage option, connect this pin to the resistor divider. 2 pgnd power ground. this pin is connected to the internal mosfet switches. this pin must be exter- nally connected to agnd. 3s w switching node. this pin is connected to the internal mosfet switches. 4 pv in supply voltage input. this pin is connected to the internal mosfet switches. 5v in supply voltage input. 6e n enable input. logic high enables the chip and logic low disables the chip, reducing the supply current to less than 1?. do not ?at this pin. v in pgnd en fb sw nc 1 2 3 6 5 4 p1 (agnd) fb pgnd sw pv in en v in 1 2 3 6 5 4 p1 (agnd) top view 3x3mm 6-lead mlp FAN2001 fan2002
3 www.fairchildsemi.com f an2001/fan2002 rev. 1.0.2 f an2001/fan2002 1a high-ef?iency step-down dc-dc converter absolute maximum ratings (note1) recommended operating conditions notes: 1. stresses above those listed under ?bsolute maximum ratings?may cause permanent damage to the device. this is a stress rati ng only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. absolute maximum ratings apply indivi dually only, not in combination. unless otherwise specified, all other voltages are referenced to agnd. 2. junction to ambient thermal resistance, ja , is a strong function of pcb material, board thickness, thickness and number of copper planes, number of via used, diameter of via used, available copper surface, and attached heat sink characteristics. 3. using mil std. 883e, method 3015.7(human body model) and eia/jesd22c101-a (charge device model). 4. refer to the applications section for further details. par ameter min max unit v in , pv in -0.3 7 v v oltage on any other pin -0.3 v in v lead soldering temperature (10 seconds) 260 ? j unction temperature 150 ? storage temperature -65 150 ? thermal resistance-junction to tab ( jc ) , 3x3mm 6-lead mlp (note 2) 8 ?/w electrostatic discharge protection (esd) level (note 3) hbm 4 kv cdm 1 pa rameter min typ max unit supply voltage range 2.5 5.5 v output voltage range, adjustable version 0.8 v in v output current 1a inductor (note 4) 3.3 h input capacitor (note 4) 10 ? output capacitor (note 4) 2 x 10 ? operating ambient temperature range -40 +85 ? operating junction temperature range -40 +125 ?
4 www.fairchildsemi.com f an2001/fan2002 rev. 1.0.2 f an2001/fan2002 1a high-ef?iency step-down dc-dc converter electrical characteristics notes: 5. refer to the application section for further details. 6. for output voltages 1.2v a 40 f output capacitor value is required to achieve a maximum output accuracy of 3% while operating in power save mode (pfm mode). v in = v out + 0.6v(min. 2.5v) to 5.5v, i out = 350ma, v out =1.2v, en = v in , t a = -40? to +85?, unless otherwise noted. typical values are at t a = 25?. symbol parameter conditions min. typ. max. units v in input voltage 0 ma i out 600 ma 2.5 5.5 v 0 ma i out 1000 ma 2.7 5.5 v i q quiescent current i out = 0ma, device is not switching 20 35 a i out = 0ma, device is s witching (note 5) r2 =10k ? 50 a r2 =100k ? 25 a shutdown supply current en = gnd 0.1 1 a undervoltage lockout threshold v in rising 1.9 2.1 2.3 v hysteresis 150 mv v enh enable high input voltage 1.3 v v enl enable low input voltage 0.4 v i en en input bias current en = v in or gnd 0.01 0.1 a r ds-on pmos on resistance v in = v gs = 5.5v 250 350 m ? v in = v gs = 2.5v 300 400 nmos on resistance v in = v gs = 5.5v 200 300 m ? v in = v gs = 2.5v 250 350 i lim p-channel current limit 2.5v < v in < 5.5v 1300 1500 2000 ma oscillator frequency 1000 1300 1500 khz i lkg_(n) n-channel leakage current v ds = 5.5v 0.1 1 a i lkg_(p) p-channel leakage current v ds = 5.5v 0.1 1 a line regulation i out 10 ma 0.16 %/v load regulation 350 ma i out 1000 ma 0.15 % vref reference voltage 0.8 v output dc voltage accuracy (note 6) 0 ma i out 1000 ma -3 +3 % over-temperature protection pwm mode only 350 ma i out 1000 ma rising t emperature 150 ? hysteresis 20 ? start-up time i out = 1000 ma, c out = 20 ? 800 ?
5 www.fairchildsemi.com f an2001/fan2002 rev. 1.0.2 f an2001/fan2002 1a high-ef?iency step-down dc-dc converter t ypical performance characteristics t a = 25?, c in = 10?, c out = 20?, l = 3.3?, r 2 = 10k ? , unless otherwise noted. 110100 1000 60 65 70 75 80 85 90 95 100 v in = 5v v out = 3.3v v in = 3.6v v out = 1.2v v in = 3.6v v out = 3v 0.1 1 10 100 1000 35 40 45 50 55 60 65 70 75 80 85 90 95 100 v in = 5.5v v out = 3. 3v v in = 3.9v 0.1 1 10 100 1000 30 40 50 60 70 80 90 100 load current (ma) load current (ma) load current (ma) load current (ma) efficiency (%) efficiency (%) efficiency (%) efficiency vs. load current efficiency vs. load current efficiency vs. load current v out = 1.2v v in = 5.5v v in = 3. 6v v in = 2.5v 02 00 400 600 800 1000 1.192 1.194 1.196 1.198 1.200 1.202 1.204 1.206 1.208 1.210 1.212 1.214 output voltage (v) quiescent current ( a) oscillator frequency (khz) v in = 5v output voltage vs. load current 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 10 20 30 40 50 60 70 80 input voltage (v) r 2 = 100k ? r 2 = 10k ? quiescent current vs. input voltage -40 -20 0 20 40 60 80 100 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 temperature ( c) frequency vs. temperature v in = 2.5v v in = 3.6v v in = 5.5v v out = 1. 2v r 2 = 100k ? r 2 = 100k ?
6 www.fairchildsemi.com f an2001/fan2002 rev. 1.0.2 f an2001/fan2002 1a high-ef?iency step-down dc-dc converter t ypical performance characteristics (contd.) t a = 25?, c in = 10?, c out = 20?, l = 3.3?, r 2 = 10k ? , unless otherwise noted. pwm mode power save mode time (1 s/div) sw node (2v/div) volt age inductor (200ma/div) current output (5mv/div) volt age time (5 s/div) sw node (2v/div) volt age output (20mv/div) volt age inductor (200ma/div) current time (10 s/div) load transient response output (50mv/div) voltage inductor (500ma/div) current 6 00ma 100ma load transient response time (10 s/div) output (50mv/ div) volt age inductor (500ma/div) current voltag e at enable pin 600ma 100ma v out = 1.2v st art-up response output ( 500mv/div) voltage inductor (200ma/div) current time (100 s/div) (5v/div) load current step load current step st art-up response time (200 s/div) output (500mv/div) volt age inductor (500ma/div) current voltag e at enable pin (5v/div) v out = 1.2v v out = 1.2v i out = 10ma v out = 1.2v i out = 1000ma
7 www.fairchildsemi.com f an2001/fan2002 rev. 1.0.2 f an2001/fan2002 1a high-ef?iency step-down dc-dc converter block diagram figure 3. block diagram detailed operation description the FAN2001/fan2002 is a step-down converter operating in a current-mode pfm/pwm architecture with a typical switching frequency of 1.3mhz. at moderate to heavy loads, the converter operates in pulse-width-modulation (pwm) mode. at light loads the converter enters a power-save mode (pfm pulse skipping) to keep the ef?iency high. pwm mode in pwm mode, the device operates at a ?ed frequency of 1.3mhz. at the beginning of each clock cycle, the p-channel transistor is turned on. the inductor current ramps up and is monitored via an internal circuit. the p-channel switch is turned off when the sensed current causes the pwm comparator to trip when the output voltage is in regulation or when the inductor current reaches the current limit (set internally to typically 1500ma). after a minimum dead time the n-channel transistor is turned on and the inductor current ramps down. as the clock cycle is completed, the n-channel switch is turned off and the next clock cycle starts. pfm (power save) mode as the load current decreases and the inductor current reaches negative value, the converter enters pulse-frequency-modula- tion (pfm) mode. the transition point for the pfm mode is given by the equation : the typical output current when the device enters pfm mode is 150ma for input voltage of 3.6v and output voltage of 1.2v. in pfm mode the device operates with a variable frequency and constant peak current, thus reducing the quiescent current to minimum. consequently, the high ef?iency is maintained at light loads. as soon as the output voltage falls below a thresh- old, set at 0.8% above the nominal value, the p-channel transis- tor is turned on and the inductor current ramps up. the p- channel switch turns off and the n-channel turns on as the peak inductor current is reached (typical 450ma). the n-channel transistor is turned off before the inductor cur- rent becomes negative. at this time the p-channel is switched on again starting the next pulse. the converter continues these pulses until the high threshold (typical 1.6% above nominal v alue) is reached. a higher output voltage in pfm mode gives additional headroom for the voltage drop during a load transient from light to full load. the voltage overshoot during this load transient is also minimized due to active regulation during turn on of the n-channel recti?r switch. the device stays in sleep mode until the output voltage falls below the low threshold. the f an2001/fan2002 enters the pwm mode as soon as the out- put voltage can no longer be regulated in pfm with constant peak current. 100% duty cycle operation as the input voltage approaches the output voltage and the duty cycle exceeds the typical 95%, the converter turns the p-chan- nel transistor continuously on. in this mode the output voltage is equal to the input voltage minus the voltage drop across the p- channel transistor: v out = v in ?i load (r dson + r l ), where r dson = p-channel switch on resistance i load = output current r l = inductor dc resistance fb error amp neg. limit comp pfm comp logic control over voltage comp under-voltage lockout mosfet driver osc slope compensation ref fb ref is is current sense neg. limit sense digital soft start is gnd sw v in en gnd 0.8v comp i out v out 1v out v in ? () 2lf ------------------------------------------ =
8 www.fairchildsemi.com f an2001/fan2002 rev. 1.0.2 f an2001/fan2002 1a high-ef?iency step-down dc-dc converter uvlo and soft start the reference and the circuit remain reset until the v in crosses its uvlo threshold. the FAN2001/fan2002 has an internal soft-start circuit that limits the in-rush current during start-up. this prevents possible v oltage drops of the input voltage and eliminates the output volt- age overshoot. the soft-start is implemented as a digital circuit increasing the switch current in four steps to the p-channel cur- rent limit (1500ma). typical start-up time for a 20? output capacitor and a load current of 1000ma is 800?. short circuit protection the switch peak current is limited cycle-by-cycle to a typical v alue of 1500ma. in the event of an output voltage short circuit, the device operates with a frequency of 400khz and minimum duty cycle, therefore the average input current is typically 200ma. thermal shutdown when the die temperature exceeds 150?, a reset occurs and will remain in effect until the die cools to 130?, at that time the circuit will be allowed to restart. applications information setting the output voltage the internal reference is 0.8v (typical). the output voltage is divided by a resistor divider, r1 and r2 to the fb pin. the out- put voltage is given by: where r 1 + r 2 < 800k ? . according to this equation, and assuming desired output volt- age of 1.5096v, and given r2 = 10k ? , the calculated value of r1 is 8.87k ? . if quiescent current is a key design parameter a higher value feedback resistor can be used (e.g. r2 = 100k ? ) and a small bypass capacitor of 10pf is required in parallel with the upper resistor as shown in figure 4. figure 4. setting the output voltage inductor selection the inductor parameters directly related to the devices perfor- mances are saturation current and dc resistance. the FAN2001/ f an2002 operates with a typical inductor value of 3.3?. the lower the dc resistance, the higher the ef?iency. for saturation current, the inductor should be rated higher than the maximum load current plus half of the inductor ripple current. this is calculated as follows: where: ? i l = inductor ripple current f = switching frequency l = inductor value some recommended inductors are suggested in the table below: ta bl e 1: recommended inductors capacitors selection f or best performances, a low esr input capacitor is required. a ceramic capacitor of at least 10?, placed as close to the v in and agnd pins of the device is recommended. the output capacitor determines the output ripple and the transient response. ta bl e 2: recommended capacitors pcb layout recommendations the recommended pcb layout is shown in figures 5 and 6. the inherently high peak currents and switching frequency of power supplies require a careful pcb layout design. figure 5. recommended pcb layout (FAN2001) v out v ref 1 r 1 r 2 ------ - + ?? ?? = c f 2 x 10 f 10 f v out en sw c in c out 1.2v (1a) 1 2 3 6 5 4 fb pgnd v in nc p1 (agnd) 3.3 h r1 100k ? 50k ? r2 inductor value vendor part number 3.3? panasonic ell6pm3r3n 3.3? murata lqs66c3r3m04 capacitor v alue vendor part number 10? taiyo yuden jmk212bj106mg jmk316bj106kl tdk c2012x5roj106k c3216x5roj106m murata grm32er61c106k ? i l v out 1v out v in ? () lf ----------------------------------------- =
9 www.fairchildsemi.com f an2001/fan2002 rev. 1.0.2 f an2001/fan2002 1a high-ef?iency step-down dc-dc converter figure 6. recommended pcb layout (fan2002) therefore, use wide traces for high current paths and place the input capacitor, the inductor, and the output capacitor as close as possible to the integrated circuit terminals. in order to mini- mize voltage stress to the device resulting from ever present s witching spikes, use an input bypass capacitor with low esr. note that the peak amplitude of the switching spikes depends upon the load current; the higher the load current, the higher the s witching spikes. the resistor divider that sets the output volt- age should be routed away from the inductor to avoid rf cou- pling. the ground plane at the bottom side of the pcb acts as an electromagnetic shield to reduce emi. f or more board layout recommendations download the applica- tion note ?cb grounding system and FAN2001/fan2011 high p erformance dc-dc converters (an-42036).
10 www.fairchildsemi.com f an2001/fan2002 rev. 1.0.2 f an2001/fan2002 1a high-ef?iency step-down dc-dc converter mechanical dimensions 3x3mm 6-lead mlp ordering information product number output voltage package type order code f an2001 adjustable 3x3mm 6-lead mlp FAN2001mpx f an2002 adjustable 3x3mm 6-lead mlp fan2002mpx
11 www.fairchildsemi.com f an2001/fan2002 rev. 1.0.2 f an2001/fan2002 1a high-ef?iency step-down dc-dc converter disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. trademarks the following are registered and unregistered trademarks fairchild semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. life support policy f airchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. product status definitions definition of terms datasheet identification product status definition advance information preliminary no identification needed obsolete this datasheet contains the design specifications for product development. specifications may change in any manner without notice. this datasheet contains preliminary data, and supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. this datasheet contains final specifications. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. this datasheet contains specifications on a product that has been discontinued by fairchild semiconductor. the datasheet is printed for reference information only. formative or in design first production full production not in production intellimax? isoplanar? littlefet? microcoupler? microfet? micropak? microwire? msx? msxpro? ocx? ocxpro? optologic ? optoplanar? p acman? f ast ? f astr? fps? frfet? globaloptoisolator? gto? hisec? i 2 c? i-lo ? implieddisconnect? rev. i15 acex? activearray? bottomless? coolfet? crossvolt ? dome? ecospark? e 2 cmos? ensigna? f act? f act quiet series? pop? power247? poweredge? powersaver? powertrench ? qfet ? qs? qt optoelectronics? quiet series? rapidconfigure? rapidconnect? serdes? silent switcher ? smart start? spm? s tealth? superfet? supersot?-3 supersot?-6 supersot?-8 syncfet? tinylogic ? tinyopto? trutranslation? uhc? ultrafet ? unifet? vcx? across the board. around the world.? the power franchise ? programmable active droop?
www. onsemi.com 1 on semiconductor and are trademarks of semiconductor components industries, llc dba on semiconductor or its subsidiaries i n the united states and/or other countries. on semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property . a listing of on semiconductor?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent ? marking.pdf . on semiconductor reserves the right to make changes without further notice to any products herein. on semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does o n semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. buyer is responsible for its products and applications using on semiconductor products, including compliance with all laws, reg ulations and safety requirements or standards, regardless of any support or applications information provided by on semiconductor. ?typical? parameters which may be provided in on semiconductor data sheets and/or specifications can and do vary in dif ferent applications and actual performance may vary over time. all operating parameters, including ?typic als? must be validated for each customer application by customer?s technical experts. on semiconductor does not convey any license under its patent rights nor the right s of others. on semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any fda class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. should buyer purchase or use on semicondu ctor products for any such unintended or unauthorized application, buyer shall indemnify and hold on semiconductor and its officers, employees, subsidiaries, affiliates, and distrib utors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that on semiconductor was negligent regarding the design or manufacture of the part. on semiconductor is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5817 ? 1050 www.onsemi.com literature fulfillment : literature distribution center for on semiconductor 19521 e. 32nd pkwy, aurora, colorado 80011 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative ? semiconductor components industries, llc

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