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系列單/雙/四、高輸出驅(qū)動(dòng)CMOS運(yùn)放具有200mA的峰值輸出電流，可滿擺幅輸入、輸出，工作于2.7V至5.5V單電源。這些放大器的轉(zhuǎn)換速率高達(dá)10V/μs，增益帶寬積(GBWP)為10MHz。MAX4230–MAX4234既能驅(qū)動(dòng)典型的頭戴式耳機(jī)(32Ω)，也可以在無線手機(jī)中用來偏置RF功率放大器(PA)。

MAX4230采用5引腳SC70封裝，具有關(guān)斷模式的單運(yùn)放MAX4231為6引腳SC70封裝。雙運(yùn)放MAX4233提供節(jié)省空間的10焊球晶片級封裝(UCSP?)封裝，是目前占位面積最小的、具有關(guān)斷模式的雙運(yùn)放。

這些運(yùn)放專為PA控制電路而設(shè)計(jì)，用于無線手機(jī)中RF PA的偏置。MAX4231/MAX4233具有一種/SHDN，可驅(qū)動(dòng)至低電平。這樣可以在必要的時(shí)候完全關(guān)閉RF PA，防止無用信號(hào)進(jìn)到RF天線中。

MAX4230系列具有低失調(diào)、寬頻帶和高輸出驅(qū)動(dòng)等特性，而封裝僅為細(xì)小的2.1mm x 2.0mm SC70。這些器件滿足汽車級工作溫度范圍(-40°C至+125°C)。