Datasheet > AS1339

AS1339

更新时间： 2024-02-11 11:00:27

品牌	Logo	应用领域
艾迈斯 - AMSCO		/
页数	文件大小	规格书
25页	4034K
描述
650mA RF Step-Down DC-DC for PA, with two LDOs

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AS1339 技术参数

生命周期：	Active	Reach Compliance Code：	unknown
风险等级：	5.75	Is Samacsys：	N
Base Number Matches：	1

AS1339 数据手册

Datasheet

AS1339

650mA RF Step-Down DC-DC for PA, with two LDOs

1 General Description

2 Key Features

ꢀ

Fixed Switching Frequency: 2MHz

PA Step-Down Converter

Low Dropout Voltage

The AS1339 is a high-frequency step-down converter

optimized for dynamically powering the power amplifier

(PA) in WCDMA or NCDMA handsets. The device uses

a 110mΩ typical bypass FET to power the PA directly

from the battery during high-power transmission. The IC

integrates two 10mA low-noise, low-dropout regulators

(LDOs) for PA biasing.

Low Output-Voltage Ripple

Dynamic Output Voltage Control (0.8V to 3.75V)

30µs Settling Time for 0.8V to 3.4V Output Voltage

Change

With a switching frequency of 2MHz, the device allows

optimization for smallest solution size or highest

efficiency. The AS1339 supports fast switching using

small ceramic 10μF input and 4.7µF output capacitors to

maintain low ripple voltage.

ꢀ

650mA Output Drive Capability

Two 10mA Low-Noise LDOs

Low Shutdown Current

The AS1339 uses an analog input driven by an external

DAC to control the output voltage linearly for continuous

PA power adjustment. The gain from REFIN to OUT is

2.5V/V. At high-duty cycle, the device automatically

switches to a bypass mode, connecting the input to the

output through a low-impedance MOSFET. The LDOs

are designed for low-noise operation, wherein each LDO

in the device is individually enabled through its own logic

control interface. The device is available in a 16-pin

WLP (2x2mm) package.

Supply Voltage Range: 2.7V to 5.5V

Thermal Shutdown

16-pin WLP (2x2mm) package

3 Applications

The AS1339 is ideal for WCDMA/NCDMA cellular

handsets, Wireless PDAs, and Smartphones.

Figure 1. Typical Operating Circuit

0.8V to 3.75V

IN1A

IN1B

2.7V to 5.5V

PAA

PAB

10µF

2.2µH

4.7µF

PGND

Analog Control

REFIN

PA_EN

AS1339

PA ON/OFF

LDO1 ON/OFF

LDO2 ON/OFF

EN1

EN2

2.85V

LDO1

LDO2

0.1µF

2.7V to 5.5V

TEST

2.85V

IN2

0.1µF

1µF

AGND

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