MAX98372 Datasheet, PDF (1/91 Pages) Maxim Integrated Products – Digital Input Class D Amplifier with DHT and Brownout Protection

MAX98372
EVALUATION KIT AVAILABLE
Digital Input Class D Amplifier
with DHT and Brownout Protection
General Description
The MAX98372 is a high-efficiency, mono Class D audio
amplifier featuring dynamic headroom tracking (DHT)
and brownout protection. DHT automatically optimizes
the headroom available to the Class D amplifier as the
power supply voltage varies, due to sudden transients
and declining battery life to maintain a consistent listening
experience. A wide 5.5V to 18V supply range allows the
device to reach 19W into an 8Ω load.
The MAX98372’s flexible digital audio interface (DAI)
supports I²S, left-justified, and TDM formats. The digital
audio interface accepts 32kHz, 44.1kHz, 48kHz, 88.2kHz,
and 96kHz sample rates with 16-/24-/32-bit data sup-
ported for all data formats. In TDM mode, the device can
support up to 16 channels of audio data. A unique clock-
ing structure eliminates the need for an external MCLK
signal that is typically needed for PCM communication.
This reduces pin count and simplifies board layout.
Active emissions limiting with edge rate control minimizes
EMI and eliminates the need for output filtering found in
traditional Class D devices.
An 8-bit PVDD supply voltage ADC enables the dynamic
headroom tracking circuit. DHT optimizes audio program
peak behavior as the supply voltage varies and provides
flexible user-defined parameters.
Thermal foldback protection ensures robust behavior
when the thermal limits of the device are exercised. The
circuit can be enabled to automatically reduce the output
power above a user specified temperature. This allows for
uninterrupted music playback even at high ambient tem-
peratures. Traditional thermal protection is also available
in addition to robust overcurrent protection.
All MAX98372 control is performed using a standard
2-wire, I²C interface. One of sixteen slave addresses can
be selected through two, four-level address pins. The IC
is available in a 0.4mm pitch, 30-bump WLP package. It is
specified over the extended, -40°C to +85°C temperature
range.
Applications
●● Tablets
●● Notebook Computers
●● Soundbars
Benefits and Features
●● Wide Supply Range (5.5V to 18V)
●● Dynamic Headroom Tracking Maintains a Consistent
Listening Experience
●● Integrated Thermal Foldback Allows Robust
Operation in a WLP Package
●● Remote Output Sensing Allows Up to 20dB THD+N
Improvement When Ferrites Are Used
●● Class D Edge Rate Control Enables Filterless
Operation
●● 110dB A-Weighted Dynamic Range
●● Output Power at 1% THD+N:
• 15.7W into 8Ω, V_PVDD = 17V
• 13.2W into 4Ω, V_PVDD = 12V
●● Output Power at 10% THD+N
• 19W into 8Ω, V_PVDD = 17V
• 15.8W into 4Ω, V_PVDD = 12V
●● Speaker Amplifier Efficiency
• 91% at 10W into 8Ω, V_PVDD = 12V
• 81% at 15W into 4Ω, V_PVDD = 12V
●● ALC Provides Battery Brownout Protection
●● Extensive Click-and-Pop Suppression
●● Space Saving, 30-Bump WLP Package
(2.2mm x 2.8mm x 0.6mm, 0.4mm Pitch)
Simplified Block Diagram
DVDD
PVDD
MAX98372
I²C
DHT
THERMAL
FOLDBACK
ALC
D
V
O
DAC
L
P
G CLASS D
A
Ordering Information appears at end of data sheet.
19-7734; Rev 1; 1/16