MAX4411 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown

19-2618; Rev 1; 4/03
80mW, Fixed-Gain, DirectDrive, Stereo
Headphone Amplifier with Shutdown
General Description
The MAX4411 fixed-gain, stereo headphone amplifier is
designed for portable equipment where board space is
at a premium. The MAX4411 uses a unique, patented
DirectDrive architecture to produce a ground-refer-
enced output from a single supply, eliminating the need
for large DC-blocking capacitors, saving cost, board
space, and component height. Additionally, the gain of
the amplifier is set internally (-1.5V/V, MAX4411 and
-2V/V, MAX4411B), further reducing component count.
The MAX4411 delivers up to 80mW per channel into a
16Ω load and has low 0.003% THD+N. An 86dB at
217Hz power-supply rejection ratio (PSRR) allows this
device to operate from noisy digital supplies without an
additional linear regulator. The MAX4411 includes ±8kV
ESD protection on the headphone outputs. Com-
prehensive click-and-pop circuitry suppresses audible
clicks and pops on startup and shutdown. Independent
left/right, low-power shutdown controls make it possible
to optimize power savings in mixed-mode, mono/stereo
applications.
The MAX4411 operates from a single 1.8V to 3.6V supply,
consumes only 5mA of supply current, has short-circuit
and thermal-overload protection, and is specified over the
extended -40°C to +85°C temperature range. The
MAX4411 is available in a tiny (2mm ✕ 2mm ✕ 0.6mm),
16-bump chip-scale package (UCSP™) and a 20-pin thin
QFN package (4mm ✕ 4mm ✕ 0.8mm).
Applications
Notebook PCs
Cellular Phones
PDAs
MP3 Players
Smart Phones
Portable Audio Equipment
UCSP is a trademark of Maxim Integrated Products, Inc.
Features
o No Bulky DC-Blocking Capacitors Required
o Fixed -1.5V/V Gain Eliminates External Feedback
Network
MAX4411: -1.5V/V
MAX4411B: -2V/V
o Ground-Referenced Outputs Eliminate DC-Bias
Voltages on Headphone Ground Pin
o No Degradation of Low-Frequency Response Due
to Output Capacitors
o 80mW per Channel into 16Ω
o Low 0.003% THD+N
o High PSRR (86dB at 217Hz)
o Integrated Click-and-Pop Suppression
o 1.8V to 3.6V Single-Supply Operation
o Low Quiescent Current (5mA)
o Independent Left/Right, Low-Power
Shutdown Controls
o Short-Circuit and Thermal-Overload Protection
o ±8kV ESD-Protected Amplifier Outputs
o Available in Space-Saving Packages
16-Bump UCSP (2mm ✕ 2mm ✕ 0.6mm)
20-Pin Thin QFN (4mm ✕ 4mm ✕ 0.8mm)
Ordering Information
PART
MAX4411EBE-T
MAX4411ETP
MAX4411BEBE-T
MAX4411BETP
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN/BUMP-
PACKAGE
16 UCSP-16
20 Thin QFN
16 UCSP-16
20 Thin QFN
GAIN
(V/V)
-1.5
-1.5
-2
-2
Functional Diagram
LEFT
AUDIO
INPUT
DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS
SHDNL
SHDNR
MAX4411
RIGHT
AUDIO
INPUT
FIXED GAIN ELIMINATES
EXTERNAL RESISTOR
NETWORK
Pin Configurations and Typical Application Circuit appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.