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

10µF (1608) VDD
CIN
3.1V up to 4.8V
Vbatt
VCC
EN
ILIMSEL
XPS
SWOUT
SW1
0.5µH
L1
SWIN
SW4
Current
Sense
SW2 SW3
VOUT
3G LTE: 2.2uF (1608)
GSM: SuperCapacitor
Cout
D GND
MB39C326
6MHZ
R2
Vin
Vout
Device
Control
Over Temp
Protection
Gate CONTROLLER
BGR
UVLO
Err Amp
Oscillator
A GND
FB
R1
R3 R2
VSELSW
L
0.5µH
Size:2x2mm
VSEL
MB39C326 Block Diagram
area
VIN
Conventional
2MHZ
R2
VOU
L
2.2µH
Size:4x4mm
Advantages of the MB39C3260
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 efficiency
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 sufficient 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-
ficient power to continue operation. This extends battery life by
more efficiently using the remaining charge in the battery.
High-efficiency 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 Features0
• 6MHz PWM operation, allowing for a 0.5µH 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 –400 ~ +850
FUJITSU SEMICONDUCTOR AMERICA, INC.
Corporate Headquarters
1250 E. Arques Avenue, M/S 333, Sunnyvale, CA 94085-5401
Tel: [phone] Fax: [phone]
E-mail: [e-mail] | Website: http://us.fujitsu.com/semi
8
­_©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