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document number: 10131 for technical questions, contact function pak @vishay.com for marketing questions, contact function pak .marketing@vishay.com www.vishay.com revision: 21-jan-05 39 fx5545g108 vishay the smallest and low profile 0.9v to 4.5v*, 4a with 570w/in 3 power density efficiency up to 95% dc/dc buck converter features ? fully integrated dc/dc converter ? high efficiency over large load range ? 100% duty cycle ? power density - more than 570w/inch 3 ? 1a shutdown current ? 2.5v to 6v input range (1li+ and 3-cell nicd or nimh cells) ? 0.9v to 4.5v* output voltage ? programmable pwm/psm controls ? low output ripple ? bga construction ? temperature range: - 40c to + 85c ? no external components required ? output power 15w ? maximum current 4a ? low profile * note: for higher output voltage please consult factory at functionpak@vishay.com the dc/dc converter is a programmable topology synchronized buck converter for today?s continuous changing portable electronic market. the dc/dc converter provides flexibility of utilizing various battery configurations and chemistries such as nicd, nimh, or li+ with an input voltage range of 2.5v to 6v. an additional flexibility is provided with topology programmability to power multiple loads such as power amplifiers, microcontrollers, or baseband logic ic?s. for ultra-high efficiency, converters are designed to operate in synchronous rectified pwm mode under full load while transforming into externally controlled pulse-skipping mode (psm ) under light load. the dc/dc converter is available in 20-ports bga package. in order to satisfy the stringent ambient temperature requirements, the dc/dc converter is designed to handle the industrial temperature range of - 40c to + 85c. application ? cordless phones, pda?s and others ? supply voltage source for low-voltage chip sets ? point of load (pol) applications such as drivers for fpga?s, microprocessors, dsp?s amplifiers, etc. ? portable computers ? battery back-up supplies ? cameras ordering information fx 5545 g108 function size circuit identifier output voltage - example: 3.3v should be written as 3v3 as the v indicates the decimal point, or adj for adjustable version - self selectable output voltage. packaging - b1 = 10pcs in bulk; b5 = 50pcs in bulk; t1 = 13? reel; t2 = 7? reel. for lead (pb)-free solder please add e2 suffix.
www.vishay.com for technical questions, contact function pak @vishay.com for marketing questions, contact function pak .marketing@vishay.com document number: 10131 40 revision: 21-jan-05 fx5545g108 vishay dimensions in inches [millimeters] l 0.58 0.01 [14.7 0.25] w 0.48 0.01 [12.2 0.25] a 0.1 0.01 [2.54 0.25] b 0.09 0.01 [2.29 0.25] c 0.09 0.01 [2.27 0.25] t 0.126 max [3.2 max] ball diameter 0.03 0.001 [0.762 0.025] note: * pin description application note is available at www.vishay.com/doc?10119 for adjustable version please refer to self selectable output voltage application note which is available at www.vishay.com/doc?10116 note: ** if not used must be connected to vin. bottom side

pin configuration* pin connection 1, 2 sd 3, 7 sync** 4, 8 n/c 5, 9 vin 6, 10 pwm/psm 11, 12 n/c 13, 17 gnd 14, 18 vout 15, 19 n/c 16, 20 gnd recommended pad pattern in inches [millimeters] adf 0.1 0.01 [2.54 0.25] 0.03 0.001 [0.8 0.02] 0.02 0.001 [0.5 0.02] tape and reel see tape and reel information - type b
document number: 10131 for technical questions, contact functionpak @vishay.com for marketing questions, contact functionpak .marketing@vishay.com www.vishay.com revision: 21-jan-05 41 fx5545g108 vishay *note: w d = power dissipated standard electrical specifications parameter unit condition min typ max input voltage range v dc 2.5 6 quiescent current a psm mode 200 soft start time ms t ss 6 sd, pwm/psm, sync logic high v v h 2.4 logic low v v l 0.8 normal mode a i dd 750 psm mode a i dd 250 shutdown mode a i dd 1 shutdown time ms t ss 5.5 insulation test voltage v ac 60hz 60sec 750 resistance ? v iso = 500 v dc 1 x 10 11 leakage current na v iso = 500 v dc 5 output power w 15 voltage v dc 0.9 to 4.5 voltage tolerance % at 25 c ambient temperature - 3 +3 temp. coefficient %/c 0.03 ripple and noise mvpp dc to 20 mhz 65 general package weight gr. 1.4 oscillator frequency khz 400 sync range f sync /f osc 1.2 1.5 temperature operation c - 40 + 85 storage c - 55 + 125 operating junction temp. c t j 150 thermal impedance c/w d * ja 82
www.vishay.com for technical questions, contact function pak @vishay.com for marketing questions, contact function pak .marketing@vishay.com document number: 10131 42 revision: 21-jan-05 fx5545g108 vishay rise time fall time rise time (pwm mode): vin = 6v; vout = 3.3v; lout = 4a fall time (pwm mode): vin = 6v; vout = 3.3v; lout = 4a fall time (pwm mode): vin = 6v; vout = 3.3v; lout = 1a fall time (pwm mode): vin = 6v; vout = 3.3v; lout = 1a rise time (pwm mode): vin = 4v; vout = 3.3v; lout = 4a fall time (pwm mode): vin = 4v; vout = 3.3v; lout = 4a rise time (pwm mode): vin = 4v; vout = 3.3v; lout = 1a fall time (pwm mode): vin = 4v; vout = 3.3v; lout = 1a
document number: 10131 for technical questions, contact function pak @vishay.com for marketing questions, contact function pak .marketing@vishay.com www.vishay.com revision: 21-jan-05 43 fx5545g108 vishay vout vs. lout* vin = 4v vout vs. vin*

vout vs lout* vin = 4v ? temp vs. lout* above 25c ambient temperature vin = 6.0v; vout = 1.2v vout vs. vin* efficiency vs. lout* vout = 1.2v

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"##$$%& pwm mode ? temp vs. lout* above 25c ambient temperature vin = 6.0v; vout = 3.3v efficiency vs. lout* vout = 3.3v 30 40 50 60 0 10 20 0.5 13 0 3.5 1.5 2 2.5 70 44.5 100 80 90 lout (a) ? temp ( c)

"##$$%&

*note: measurements were taken with power supply: zup 20-40 fr om nemic lambda; electronic load: 6063b from agilent; multimeter: fluke 45 from fluke and 34401 digital multimeter from agilent; scope: infiniium 54815a from agilent.
www.vishay.com for technical questions, contact function pak @vishay.com for marketing questions, contact function pak .marketing@vishay.com document number: 10131 44 revision: 21-jan-05 fx5545g108 vishay vout vs. lout* vin = 4v vout vs. vin*

' "##$$%&

*note: measurements were taken with power supply: zup 20-40 from nemic lambda; electronic load: 6063b from agilent; multimeter: fluke 45 from fluke and 34401 digital multimeter from agilent; scope: infiniium 54815a from agilent. efficiency vs. lout* vin = 4.0v; vout = 3.3v psm mode

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