19-2387; Rev 3; 11/05
1.4W and 1W, Ultra-Small, Audio Power
Amplifiers with Shutdown
The MAX4364/MAX4365 are bridged audio power
amplifiers intended for portable audio devices with
internal speakers. The MAX4364 is capable of delivering 1.4W from a single 5V supply and 500mW from a
single 3V supply into an 8Ω load. The MAX4365 is
capable of delivering 1W from a single 5V supply and
450mW from a single 3V supply into an 8Ω load. The
MAX4364/MAX4365 feature 0.04% THD+N at 1kHz,
68dB PSRR at 217Hz, and only 10nA of supply current
in shutdown mode.
The MAX4364/MAX4365 bridged outputs eliminate the
need for output-coupling capacitors, minimizing external component count. The MAX4364/MAX4365 also
include internal DC bias generation, clickless operation,
short-circuit and thermal-overload protection. Both
devices are unity-gain stable, with the gain set by two
external resistors.
The MAX4364 is available in a small 8-pin SO package.
The MAX4365 is available in tiny 8-pin TDFN (3mm ✕
3mm ✕ 0.8mm) and µMAX® packages.
Features
♦ 1.4W into 8Ω Load (MAX4364)
♦ 1W into 8Ω Load (MAX4365)
♦ 0.04% THD+N at 1kHz
♦ 68dB PSRR at 217Hz
♦ 2.7V to 5.5V Single-Supply Operation
♦ 5mA Supply Current
♦ Low-Power, 10nA Shutdown Mode
♦ Pin Compatible with the LM4861/LM4862/LM4864
(MAX4364)
♦ Clickless Power-Up and Shutdown
♦ Thermal-Overload and Short-Circuit Protection
♦ Available in TDFN, µMAX, and SO Packages
Ordering Information
PART
Two-Way Radios
-40°C to +85°C
8 SO
-40°C to +85°C
8 µMAX
MAX4365ETA
PDAs
PIN-PACKAGE
MAX4365EUA
Cellular Phones
TEMP RANGE
MAX4364ESA
Applications
-40°C to +85°C
8 TDFN-EP*
TOP
MARK
—
—
ACD
*EP = Exposed paddle.
General-Purpose Audio
Pin Configurations appear at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Application Circuit/Functional Diagram
VCC
6
VCC
50kΩ
CLICKLESS/POPLESS
SHUTDOWN CONTROL
SHDN 1
2 BIAS
OUT- 8
CBIAS
50kΩ
3 IN+
CIN
AUDIO
INPUT
10kΩ
10kΩ
OUT+ 5
RIN
4 IN-
MAX4364
GND
7
RF
________________________________________________________________ Maxim Integrated Products
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.
1
MAX4364/MAX4365
General Description