Datasheet > LM3248TMXNOPB

LM3248TMXNOPB

更新时间： 2024-11-12 12:05:59

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德州仪器 - TI		转换器
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31页	1334K
描述
LM3248 2.7 MHz, 2.5A Adjustable Boost-Buck DC/DC Converter

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LM3248TMXNOPB 数据手册

LM3248

www.ti.com

SNVSA01A –JULY 2013–REVISED SEPTEMBER 2013

LM3248 2.7 MHz, 2.5A Adjustable Boost-Buck DC/DC Converter

with Boost and Active Current Assist and Analog Bypass (ACB)

Check for Samples: LM3248

FEATURES

DESCRIPTION

The LM3248 is a PWM/PFM Boost-Buck DC/DC

•

Output Voltage V_OUTAdjustable from 0.4V to

4.0V (typ.)

converter that provides efficient utilization of battery

power over a wide voltage range. The device

architecture is suitable for advanced RF front-end

systems that demand dynamic voltage and current to

support converged power amplifier architectures

operating in 2G/3G/4G and 3GPP/LTE modes. For

example, the LM3248 is designed to produce higher

output voltages while maintaining PFM mode as

required by some new reduced-power CMOS PAs.

The extremely fast Boost-Buck function reduces RF

PA overhead power dissipation, extending battery talk

time. The device will operate at input voltage V_IN

range of 2.7V to 5.5V and an adjustable output

voltage V_OUTrange of 0.4V to 4.0V at a maximum

current load of 2.5A.

•

Input Voltage Range V_INfrom 2.7V to 5.5V

Boost-Buck and Buck (Boost-Bypass)

Operating Modes with Seamless Transition

•

2.5A Load Current Capability

High Conversion Efficiency (> 90% typ.)

High-Efficiency PFM/PWM Modes with

Seamless Transition

•

Very Fast Transient Response: 10 µs

ACB Reduces Inductor Size Requirements

Dither to aid RX Band Noise Compliance

APPLICATIONS

The LM3248 is available in a 30-bump, lead-free thin

DSBGA package.

•

Multi-mode 2G/3G/4G and 3GPP/LTE Smart-

phones and Tablets

•

Hand-Held Radios

RF Mobile Devices

Typical Application Diagram

1 ꢀF Low ESL

1.0 ꢀH

10 ꢀF

VBATT

2.7V to 5.5V

SW_

BOOST

OUT_

BOOST

PVIN_

BUCK

VDD1_

BUCK

VDD2_

BUCK

FB_

BUCK

PVIN_

BOOST

ACB

SW_

BUCK

10 ꢀF

1.5 ꢀH

10 ꢀF

ACB

BYPASS

VCC_PA

BUCK

BOOST

VDD_

BOOST

1 nF

VCON

CONTROL

BOOST_

GATE

SGND_

BUCK

SGND_

BOOST

MODE

ENABLE

DGND

1.8V Logic

Apps

Processor

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.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...31

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