LM3280

BYP

SVIN

LDO3

FB

C3

1 éF

ENBUCK

ENLDO1

ENLDO2

ENLDO3

VCON

SGND

LDO2

LDO1

SW

BYPOUT

C2

4.7 éF

L1

2.2 éH

C5

1 éF

C6

1 éF

C7

1 éF

PA

BAND2

PA

BAND3

PA

BAND1

VIN :

2.7V to 5.5V

PGND

PVIN

C1

10 éF

VOUT :

0.8V to 3.6V

VLDO1 : 2.85V

VLDO2 :2.85V

VLDO3 : 2.85V

VCON :

0.267V to 1.200V

VOUT = 3 x VCON

DAC

PA VCC

ON/OFF

ON/OFF

ON/OFF

éPC

ON/OFF

VRE

F

VRE

F

VRE

F

LM3280

www.ti.com

SNOSAU4B – OCTOBER 2006 – REVISED FEBRUARY 2013

LM3280 Adjustable Step-Down DC-DC Converter and 3 LDOs for RF Power Management

Check for Samples: LM3280

1

FEATURES

DESCRIPTION

The LM3280 is a multi-functional Power Management

2

•

2MHz (typ.) PWM Switching Frequency

Unit, optimized for low-power handheld applications

•

Operates from a Single Li-Ion Cell (2.7V to

such as Cellular Phones.

5.5V)

The LM3280 incorporates three low-dropout LDO

•

Adjustable Output Voltage (0.8V to 3.6V) DC-

voltage regulators and one step down PWM DC-DC

DC

converter with an internal Bypass FET. The step

•

High-Efficiency Synchronous Buck Converter

down converter's output voltage can be set using an

•

300mA Maximum Load Capability (PWM Mode)

PA at various power levels. The LDO operates a

•

500mA Maximum Load Capability (Bypass

nominal output voltage of 2.85V and maximum load

mode)

current capability of 20mA for a reference voltage

•

PWM, Forced and Automatic Bypass Mode

required by linear RF power amplifiers. The LM3280

additionally features a separate enable pin for each

•

3 Low-Dropout and Fast Transient Response

output.

LDOs

•

16-pin DSBGA Package

The LM3280 is available in a 16-pin lead free DSBGA

package.

•

Current Overload Protection

•

Thermal Overload Protection

APPLICATIONS

•

Cellular Phones

•

Hand-Held Radios

•

Battery Powered RF Devices

Typical Application

Figure 1. LM3280 Typical Application

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.