MAX4230, MAX4231, MAX4232, MAX

The MAX4230–MAX4234 single/dual/quad, high-outputdrive
CMOS op amps feature 200mA of peak output
current, rail-to-rail input, and output capability from a
single 2.7V to 5.5V supply. These amplifiers exhibit a
high slew rate of 10V/μs and a gain-bandwidth product
(GBWP) of 10MHz. The MAX4230–MAX4234 can drive
typical headset levels (32Ω), as well as bias an RF
power amplifier (PA) in wireless handset applications.
The MAX4230 comes in a tiny 5-pin SC70 package and
the MAX4231, single with shutdown, is offered in the
6-pin SC70 package and a 1.5mm x 1.0mm x 0.5mm
ultra-thin μDFN package. The dual op-amp MAX4233 is
offered in the space-saving 10-bump chip-scale package
(UCSP™), providing the smallest footprint area for
a dual op amp with shutdown.
These op amps are designed to be part of the PA control
circuitry, biasing RF PAs in wireless headsets. The
MAX4231/MAX4233 offer a SHDN feature that drives
the output low. This ensures that the RF PA is fully disabled
when needed, preventing unconverted signals to
the RF antenna.
The MAX4230 family offers low offsets, wide bandwidth,
and high-output drive in a tiny 2.1mm x 2.0mm spacesaving
SC70 package. These parts are offered over the
automotive temperature range (-40°C to +125°C).
Applications
RF PA Biasing Controls in Handset Applications
Portable/Battery-Powered Audio Applications
Portable Headphone Speaker Drivers (32Ω)
Audio Hands-Free Car Phones (Kits)
Laptop/Notebook Computers/TFT Panels
Sound Ports/Cards
Set-Top Boxes
Digital-to-Analog Converter Buffers
Transformer/Line Drivers
Motor Drivers

MAX4230–MAX4234系列单/双/四、高输出驱动CMOS运放具有200mA的峰值输出电流，可满摆幅输入、输出，工作于2.7V至5.5V单电源。这些放大器的转换速率高达10V/µs，增益带宽积(GBWP)为10MHz。MAX4230–MAX4234既能驱动典型的头戴式耳机(32Ω)，也可以在无线手机中用来偏置RF功率放大器(PA)。

MAX4230采用5引脚SC70封装，具有关断模式的单运放MAX4231为6引脚SC70封装。双运放MAX4233提供节省空间的10焊球晶片级封装(UCSP™)封装，是目前占位面积最小的、具有关断模式的双运放。

这些运放专为PA控制电路而设计，用于无线手机中RF PA的偏置。MAX4231/MAX4233具有一种/SHDN，可驱动至低电平。这样可以在必要的时候完全关闭RF PA，防止无用信号进到RF天线中。

MAX4230系列具有低失调、宽频带和高输出驱动等特性，而封装仅为细小的2.1mm x 2.0mm SC70。这些器件满足汽车级工作温度范围(-40°C至+125°C)。