MAX98372
Digital Input Class D Amplifier with DHT and
Brownout Protection
High-Power Digital Class D with Brownout Protection and DHT Requires No
Programming
NDA Required. Request Full Data Sheet
Overview
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 I
2
S, 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 supported for all data formats. In TDM mode, the
device can support up to 16 channels of audio data. A unique clocking 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 temperatures. Traditional thermal protection is also available in addition to robust
overcurrent protection.
All MAX98372 control is performed using a standard 2-wire, I
2
C 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.
Key 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)
•
•
•
•
•
Applications/Uses
• Notebook Computers
• Soundbars
• Tablets
MAX98372
Digital Input Class D Amplifier with DHT and
Brownout Protection
High-Power Digital Class D with Brownout Protection and DHT Requires
No Programming
KEY SPECS
Part Number
Class Spkr.
Amp.
V
CC
(V)
min
Spkr.
Amp.
V
CC
(V)
max
18
Spkr.
Amp.
I
CC
(mA)
typ
8.4
P
OUT
into 4Ω
@ 1%
THD+N
(W)
min
13.2
P
OUT
into 4Ω
@ 10%
THD+N
(W)
min
15.8
P
OUT
into 8Ω
@ 1%
THD+N
(W)
min
15.7
P
OUT
into 8Ω
@ 10%
THD+N
(W)
min
19
SNR
PSRR Package/Pins
Spkr.
(dB)
(dB)
Amp.
Half
Pwr.
THD+N
(%)
A-
min
Weighted
0.02
110
60
WLP/30
MAX98372 NEW!
D
5.5
https://www.maximintegrated.com/en/products/analog/audio/MAX98372.html
3/8/2016
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