MB39C326 6mhz synchronous buck boost dc/dc converter description 0 the fujitsu MB39C326 6mhz synchronous buck boost dc/dc converter is designed to power the radio frequency power am - plifers (rfpas) in mobile handsets or other mobile devices that use a single-cell li-ion battery. the dc/dc converter switches at a higher frequency (6mhz) than conventional converters on the market. the higher switching frequency is more effcient and permits the use of a smaller inductor, reducing the overall board space of the power management circuits by as much as half. the buck-boost functionality of the fujitsu MB39C326 helps prolong battery life and effciency. by switching automatically between a buck operation (stepping down the voltage) when the battery is fully charged and a boost operation (stepping up the voltage) as the battery is discharged, the MB39C326 maxi - mizes the overall operating voltage from the lithium battery while providing a stable power supply to the power amplifer. the result is a more consistent voltage level and a device that can operate for longer on a single charge. the fujitsu MB39C326 provides up to 800ma of output current over an input voltage range of 2.5v to 4.8v. the device features a built-in internal feld-effect transistor (fet), over-temperature protection, and an input-under-voltage lockout. the MB39C326 is available in a 20-pin, 0.4mm-ball-pitch, 2.15mm x 1.94mm wl-csp (wafer-level chip size) package. application 0 ? radio frequency power amplifiers (rfpas) powered by a single-cell li-ion battery ? mobile phones ? pdas and handheld mobile devices ? pc cards and usb dongles with rf transceivers ? medical handheld devices fs fact sheet ac adapter charger baseband vout power supply for pa rf pa buck/boost dc-dc converter power management for system mobile phone cntl_vout 5-6v dc li-ion 1 cell MB39C326 application diagram
advantages of the MB39C326 0 6mhz switching frequency allows for a smaller inductor and reduced board space compared to conventional dc/dc converters that have switch - ing frequencies between 2 to 3mhz or lower, the fujitsu 6mhz synchronous buck boost dc/dc converter allows for a smaller size inductor, reducing the overall surface area occupied by the power supply by as much as half. this is critical for mobile devices where space is at a premium. automatic buck-boost operations prolong li-ion battery life and effciency when a li-ion battery is fully charged, it starts with a high operating voltage. as the battery is discharged, its operating voltage declines to the point where the battery can no longer provide suffcient voltage to power its host device, even if some charge remains. the fujitsu MB39C326 6mhz synchronous buck boost dc/dc converter can extend the usable life of a battery by boosting (stepping up) the output voltage level to provide suf - fcient power to continue operation. this extends battery life by more effciently using the remaining charge in the battery. high-effciency power supply the MB39C326 features a new, high-efficiency controller de - signed using a low-gate charge-process technology that reduces switching loss and power consumption. in combination with the buck-boost function, the controller greatly enhances the overall efficiency of the dc/dc converter. key features 0 ? 6mhz pwm operation, allowing for a 0.5h small form inductor ? automatic transition between buck mode and boost mode ? built-in internal field-effect transistor (fet) ? input voltage range: 2.5v to 4.8v ? adjustable output voltage range: 0.4v to 4.5v ? input current limit: 2a ? output current of 800ma ? over-temperature protection ? input under-voltage lock out ? package: 20pin 0.4mm-ball-pitch 2.15mm 1.94mm wl-csp (wafer-level chip-size package) ? operating temperature range of C40 0 ~ +85 0 swout swin sw1 sw2 current sense device control gate controller over temp protection oscillator bgr uvlo err amp sw3 sw4 vout d gnd a gnd vsel vselsw fb r1 vdd c in vcc en xps ilimsel r2 r3 l1 0.5h cout 10f (1608) 3.1v up to 4.8v vbatt MB39C326 block diagram fujitsu semiconductor america, inc. corporate headquarters 1250 e. arques avenue, m/s 333, sunnyvale, ca 94085-5401 tel: (800) 866-8608 fax: (408) 737-5999 e-mail: fsa_inquiry@us.fujitsu.com | website: http://us.fujitsu.com/semi ? 2011 fujitsu semiconductor america, inc. all company and product names are trademarks or registered trademarks of their respective owners. specifications subject to change without notice. printed in the u.s.a. pmic-fs-21396-03/2011 8 gnd 3g lte: 2.2uf (1608) gsm: supercapacitor v out v ou v in v in r2 l l r1 c in c out gnd gnd c out c in c out r2 r1 gnd MB39C326 6mh z 0.5h size:2x2mm 2.2h size:4x4mm conventional 2mh z area gnd
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