MB39C326 Datasheet, PDF (1/2 Pages) Fujitsu Component Limited. – 6MHz Synchronous Buck Boost DC/DC Converter

FS fact sheet
MB39C326
6MHz Synchronous Buck Boost DC/DC Converter
Description0
The Fujitsu MB39C326 6MHz Synchronous Buck Boost DC/DC
Converter is designed to power the radio frequency power am-
plifiers (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 efficient 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 efficiency. 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 amplifier.
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 field-effect transistor (FET), over-temperature
protection, and an input-under-voltage lockout. The MB39C326
is available in a 20-pin, 0.4mm-ball-pitch, 2.15mmx1.94mm
WL-CSP (wafer-level chip size) package.
Application0
• 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
5-6V DC
AC adapter
Charger
Li-ion
1 cell
mobile phone
Power
management
for system
Power supply for PA
Buck/Boost
Vout
DC-DC
converter
Cntl_Vout
MB39C326
Application Diagram
BaseBand
RF
PA