FUJITSU MICROELECTRONICS
DATA SHEET
DS04-27261-5E
ASSP for Power Management Applications of
Ultra Mobile PC
6ch DC/DC Converter IC
for LPIA Platform VR
MB39C308
■ DESCRIPTION
The MB39C308 is a 6ch DC/DC buck converter LSI, which integrates all of necessary power supplies for UltraMobile PC powered by 2-cell Li-ion battery. And the MB39C308 uses current mode topology with N-channel
synchronous rectification to realize high conversion efficiency.
The MB39C308 is the Power Management IC supporting the LPIA(Low Power Intel Architecture) which Intel
Corporation proposes as the low power consumption platform for UMPC.
The CH1 and CH2 are flexible to adopt the output current capability by selection of external FETs and easy to
optimize efficiency. The CH3, CH4, CH5 and CH6 integrate the switching FETs capable of high current for downsizing the power supply solution.
The MB39C308 uses Fujitsu’s LDMOS process technology and supplies all power without dispersing power from
a lithium-ion battery.
■ FEATURES
•
•
•
•
•
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Input voltage range
: 5.5 V to 12.6 V
Topology
: Current Mode
Integrated FET Driver for external MOSFETs : CH1, CH2
Integrated Switching MOSFETs
: CH3, CH4, CH5, CH6
Fixed Preset Output Voltage
: CH1, CH2, CH5
Selectable Preset Output Voltage
: CH3, CH4, CH6
Output
voltage
Output
current
Remarks
CH1
5V
2 A*
⎯
CH2
3.3 V
4.5 A*
⎯
CH3
1.8 V/1.5 V
Max : 2.7 A
CH4
0.9 V/0.75 V
Max : 1.5 A
CH5
1.5 V
Max : 2.5 A
CH6
1.1 V/1.05 V
Max : 3.5 A
Channel
DDR2/DDR3 are selectable.
⎯
Two values are selectable.
* : It is the reference value at the typical EVB.
(Continued)
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2009.2
