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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 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
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6MHz Synchronous Buck Boost DC/DC Converter - … · The Fujitsu MB39C326 6MHz Synchronous Buck Boost DC/DC ... Compared to conventional DC/DC converters that have switch- ... GSM…

Jul 14, 2018

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Page 1: 6MHz Synchronous Buck Boost DC/DC Converter - … · The Fujitsu MB39C326 6MHz Synchronous Buck Boost DC/DC ... Compared to conventional DC/DC converters that have switch- ... GSM…

MB39C3266MHz Synchronous Buck Boost DC/DC Converter

Description0The Fujitsu MB39C326 6MHz Synchronous Buck Boost DC/DC Converter is designed to power the radio frequency power am-plifi ers (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 effi cient 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 effi ciency. 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 amplifi er.

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 fi eld-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

FS fact sheet

AC adapterCharger

BaseBand

Vout

Power supply for PA

RF PA

Buck/BoostDC-DC

converterPowermanagement

for system

mobile phone

Cntl_Vout

5-6V DC

Li-ion1 cell

MB39C326 Application Diagram

Page 2: 6MHz Synchronous Buck Boost DC/DC Converter - … · The Fujitsu MB39C326 6MHz Synchronous Buck Boost DC/DC ... Compared to conventional DC/DC converters that have switch- ... GSM…

Advantages of the MB39C3260

6MHz switching frequency allows for a smaller inductor and reduced board spaceCompared 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 effi ciencyWhen 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 suffi cient 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-fi cient power to continue operation. This extends battery life by more effi ciently using the remaining charge in the battery.

High-effi ciency power supplyThe 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/1A/0.5A (Selectable)

• Quiescent current: 50µA

• 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

SWOUT SWIN

SW1

SW2

CurrentSense

DeviceControl

Gate CONTROLLER

Over TempProtection Oscillator

BGRUVLO Err Amp

SW3

SW4 VOUT

D GND

A GND

VSEL

VSELSW

FB R1

VDD

CIN

VCC

EN

XPSILIMSEL

R2R3

L1

0.5µH

Cout

10µF (1608)

3.1V up to 4.8VVbatt

MB39C326 Block Diagram

FUJITSU SEMICONDUCTOR AMERICA, INC.Corporate Headquarters1250 E. Arques Avenue, M/S 333, Sunnyvale, CA 94085-5401Tel: (800) 866-8608 Fax: (408) 737-5999E-mail: [email protected] | 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-21396-08/2011

8

GN

D

3G LTE: 2.2uF (1608)GSM: SuperCapacitor

Vout

VOUVIN

Vin

R2

L L

R1

Cin

CO

UT

GN

D

GN

D

CO

UT

CIN

CO

UT

R2

R1

GN

D

MB39C3266MHZ

0.5µHSize:2x2mm

2.2µHSize:4x4mm

Conventional2MHZ

area

GN

D