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The following document contains information on Cypress products.
FUJITSU SEMICONDUCTOR
FACT SHEET
NP405-00001-6v0-E
ASSP for Power Supply Applications
6MHz Synchronous Rectification Buck-Boost
DC/DC Converter IC MB39C326
MB39C326 was designed for the RF power amplifier of the mobile device that used 1-cell Li-ion battery. It is
high-efficiency and low noise 6 MHz buck-boost DC/DC converter IC. The size of the inductor can be greatly
reduced to 2-3MHz existing product by operating by the high frequency of 6MHz. Therefore, it becomes
possible to reduce the substrate area of the power supply part by half. The range of the voltage that can be
used can be expanded by automatic switching operation of the buck-boost circuit, and a steady power supply
to the power amplifier can be supplied.
■ DESCRIPTION

High efficiency
: Up to 93%
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Input voltage range
: 2.5 V to 5.5 V

Adjustable output voltage range : 0.4 V to 5.0 V

Input current limit value
: 2 A/1A/0.5A
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Output current
: 1200mA (Buck, output at 3.3V)
: 800mA (Boost, output at 3.3V)

6MHz PWM operation allows 0.5 μH small form inductor

Less than 20 μs step response for 3G
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Automatic Transition between buck mode and boost mode
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Selectable output voltage with external resistor
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Built-in Over temperature protection circuit

Built-in Under voltage lockout protection circuit

Package
: 20pin, WL-CSP(2.15mm × 1.94 mm × 0.625mm)
■ APPLICATIONS
 Products that use 1-cell lithium batteries for the power supply
 RF power amplifier
 Cell-phone
 RF-PC card, PDA
■ PACKAGE : 20-pin plastic WL-CSP
April 2012
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Copyright©2011-2012 FUJITSU SEMICONDUCTOR LIMITED All rights reserved
MB39C326
■ PIN ASSIGNMENTS
■ BLOCK DIAGRAM
■ ORDERING INFORMATION
Part number
Packege
Remarks
MB39C326PW
20-pin plastic WL-CSP
(WLP-20P-M01)
0.4 mm-ball-pitch 2.15×1.94 mm
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The contents of this document are subject to change without notice.
NP405-00001-6v0-E
April 2012
2/2
Copyright©2011-2012 FUJITSU SEMICONDUCTOR LIMITED All rights reserved
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