LXDC55KAAA-205 micro dc-dc converter 1 april 2013 1. features ? small footprint buck converter for up to 3a output current application ? low emi noise using an inductor-embedded ferrite substrate ? input voltage range : 2.7 to 5.5v ? user adjustable output voltage : 0.8 to 3.6v ? pwm/pfm mode ? powergood function ? over current protection, over temperature protection 2. mechanical details unit:mm mark dimension mark dimension l 5.0 +/- 0.2 e 1.1 w 5.7 +/- 0.2 f 0.6 t 2.1 max g 0.35 a 0.25 h 0.6 b 0.7 i 0.35 c 0.4 j 1.0 d 0.8
LXDC55KAAA-205 micro dc-dc converter 2 april 2013 pin configuration pin no. symbol i/o description 1 en input on/off control pin h: enable, l: disable 4,5 vin input power supply voltage input pin 6,12 gnd - gnd pin 7,8 vout output regulated voltage output pin 10 pg output power good output pin h: normal operation 11 fb input external resistor connection pin for output voltage setting 2,3,9,13,14 nc - no connection this pin can be connected to any other pins
LXDC55KAAA-205 micro dc-dc converter 3 april 2013 3. electrical specification 3-1 absolute maximum ratings parameter symbol rating unit maximum input voltage vin 6 v maximum en pin voltage ven 6 v maximum fb pin voltage vfb 6 v maximum pg pin voltage vpg vin v operating temperature t op -40 to +85 o c storage temperature t sto -40 to +85 o c 3-2 electrical characteristics (ta=25 ) parameter symbol condition min. typ. max. unit input voltage vin 2.7 5.5 v output voltage range vout 0.8 3.6 v uvlo uvlo vin falling 2.1 2.2 2.3 v hysteresis 200 mv output voltage accuracy vacc pwm mode -2.5 +2.5 % load current range iout 0 3000 ma over current protection ocp auto-recovery 3000 5500 ma ripple voltage vrpl vin=5v, rfb=576ohm, (vout=3.3v) iout=1500ma, bw=100mhz 20 mv efficiency eff vin=5v, rfb=576ohm, (vout=3.3v) iout=1500ma, bw=100mhz t.b.d. 93 % en control voltage venh on ; enable 1.0 vin v venl off ; disable 0 0.4 v power good threshold pgthh output voltage rising 95 % pgthl output voltage falling 90 % power good sink current ipg 1 ma external output capacitor(*1) cout 22 150 uf ? (*1) external capacitors (cout>22uf) shall be placed near the module in order to proper operation. ? the above characteristics are tested using the application circuit on section 4.
LXDC55KAAA-205 micro dc-dc converter 4 april 2013 3-3 output current thermal derating (vin=5.0v) 0 0.5 1 1.5 2 2.5 3 3.5 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 i o [ a ] ta[ ] thermal derating vo=0.8v vo=1.2v vo=1.8v vo=3.3v, 3.6v note: this thermal derating data is measured on murata evaluation board and reference only. the temperature of the module depends on pcb design and peripheral components. please keep the module temperature under 105 o c on your board.
LXDC55KAAA-205 micro dc-dc converter 5 april 2013 4. application circuit cin : grm21bb30j106 (10uf/6.3v mlcc) cout : grm21bb30j226 (22uf/6.3v mlcc) 5. reference land pattern unit (mm) mark dimension b 0.7 c 0.4 d 0.8 e 1.1 f 0.6 *reference purpose only c (5) (8)(7) (10)(9) (6) (12) (11) (1)(2) (14) (13) (3)(4) bdbb c c c e f e e f b
LXDC55KAAA-205 micro dc-dc converter 6 april 2013 6 . output voltage adjustment output voltage can be adjusted by using a resistor (rfb) between fb pin and gnd pin. rfb = 5.44/(vout-0.8v) C 1.6 [kohm] rfb example vout(v) rfb(kohm) vout(v) rfb(kohm) 0.8 open 2.5 1.6 1.2 12 3.0 0.872 1.5 6.17 3.3 0.576 1.8 3.84 3.6 0.342
LXDC55KAAA-205 micro dc-dc converter 7 april 2013 enab le sw vin vin_s gnd vout_s vout gnd_s gnd gnd_s power good 7. typical electric performance (reference purpose only) (ta=25 ) micro dcdc converter evaluation board (p2lx1568f) measurement setup * evaluation board initial output voltage setting : 3.3v ( resistor : 560 + 16 ) a v load v a v output voltage adjustment resistor
LXDC55KAAA-205 micro dc-dc converter 8 april 2013 efficency vin=5.0v, output ripple-noise vin=5.0v, bw : 100mhz
LXDC55KAAA-205 micro dc-dc converter 9 april 2013 load regulation vin=5.0v, vout=0.8v vin=5.0v, vout=1.2v vin=5.0v, vout=1.8v vin=5.0v, vout=2.5v vin=5.0v, vout=3.3v note: 1. this datasheet's specifications are subject to change or our products in it may be discontinued without advance notice. please check with our sales representatives or product engineers before ordering. 2. this datasheet has only typical specifications because there is no space for detailed specifications. therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
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