Analog Devices MAX98380 Manual

MAX98380

General Description

The MAX98380 is a small, mono Class-D audio amplifier
featuring an integrated capacitive boost converter. The
device implements a tripler charge pump-based boost
converter that efficiently delivers up to 4.85W at 1%
THD+N into an 8Ω load. The capacitive boost replaces
the large and expensive inductor required for an inductive
boost with smaller, lower-profile capacitors that reduce the
total PCB solution.
Additionally, as the power-supply voltage varies due to de-
clining battery life, an on-chip limiter (DHT) automatically
optimizes the headroom available to the Class-D amplifier
to maintain consistent distortion and listening levels.
Thermal-foldback protection ensures robust behavior
when the thermal limits of the device are reached. When
enabled, it automatically reduces the output power when
the temperature exceeds a user-specified threshold. This
allows for uninterrupted music playback even at high am-
bient temperatures. Traditional thermal protection is also
available in addition to robust overcurrent protection.
The device provides a PCM interface for audio data and
2
a standard I C interface for control data communication.
The PCM interface supports audio playback using I
left-justified, and TDM audio data formats. A unique clock-
ing structure eliminates the need for an external master
clock for PCM communication. This reduces EMI and pos-
sible board coupling issues in addition to reducing the size
and pin count.
Active emissions-limiting and edge-rate limiting circuitry
greatly reduce EMI. A filterless spread-spectrum modula-
tion scheme eliminates the need for output filtering found
in traditional Class-D devices and reduces the component
count of the solution.
The IC is available in a 0.35mm pitch 24-bump wafer-level
package (WLP). It is specified over the extended, -40°C to
+85°C temperature range.

Applications

● Smartphones
● Smart Speakers
● IoT Devices
● Tablets
SMBus is a trademark of Intel Corp.
Ordering Information
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Benefits and Features

● Integrated Capacitive Boost Converter—No Bulky
Inductors
● 3.6W Output Power into 6Ω at V
● 10mW Total Quiescent Power
● 3ms Turn-On Time
● 80% Efficiency (1.0W into R
● 19.8μV Speaker Mode Output Noise
RMS
● 16.5μV Receiver Mode Output Noise
RMS
● Low 0.005% THD+N at 1kHz
● No MCLK Required
● Sample Rates of 8kHz to 192kHz
● Supports Left, Right, or (Left/2 + Right/2) Output in I
and Left-Justified Modes
● Sophisticated Edge Rate Control Enables Filterless
Class-D Outputs
● Low RF Susceptibility Rejects TDMA Noise from GSM
Radios
● Class-D Switching Frequency Trimmed to 10% for
Better EMI Planning
● Extensive Click-and-Pop Reduction Circuitry
● Dynamic Headroom Tracking (DHT)
● Robust Short-Circuit and Thermal Protection
2
S, ● Available in Space-Saving Package: 1.468mm x
2.138mm, 24-Bump WLP (0.35mm Pitch)
EVALUATION KIT AVAILABLE
= 3.7V
BAT
= 8Ω, V = 3.7V)
L BAT
2
S
19-101484; Rev 0; 5/22