Analog Devices MAX98388 Manual

Digital Input Class-D Amplifier with
IV Feedback and Brownout Protection
General Description
The MAX98388/MAX98389 is a small, cost-effective
mono digital input amplifier with integrated IV feedback.
The device operates over a wide supply voltage range
from 2.3V to 10V. With this supply range, both versions
support single-cell, two-cell,
regulated/boosted portable applications. MAX98388 is
optimized for up to 5.5V applications (single-cell), while
MAX98389 is optimized for 5V to 10V cases (two-cell).
The Class-D playback amplifier pairs Class-AB level
audio performance with the efficiency needed to extend
battery life in portable applications. Active emissions-
limiting (AEL) and edge-rate limiting circuitry combined
with a spread-spectrum modulation (SSM) scheme
reduces EMI and eliminates the need for the output
filtering required for traditional Class-D amplifiers.
The device provides a precision output current sense
channel and an output voltage feedback channel. The
data collected by these channels can be transmitted on
the audio data output and enables algorithms such as
audio enhancement, bass boosting, speaker protection,
and haptic functions to be run on the host audio DSP.
The device includes a programmable threshold playback
channel ALC that provides brownout protection for
batteries in portable systems, and robust thermal and
overcurrent protection to prevent device damage.
The device provides a PCM interface for audio playback
and IV feedback data and pairs this with a standard I
interface for device control and status readback. The
PCM interface supports common audio data formats
2
such as I S, left justified, and TDM timing. A unique
clocking structure eliminates the need for an external
high-frequency reference clock. In addition to reducing
device size and pin count, eliminating this clock saves
interface power while reducing the risk of EMI from high-
speed switching and potential board coupling issues.
The package connections are designed to only require
edge routing, allowing the use of the cost-effective
wafer-level package (WLP) with no requirement for
expensive bump vias. The device is available in a 0.4mm
pitch 16-bump WLP package and is specified over the
extended -40°C to +85°C temperature range.
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Benefits and Features
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Applications
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Ordering Information
MAX98388/MAX98389
Wide Amplifier Supply Range (2.3V to 10V)
• Supports Both Single-Cell and Two-Cell Cases
High-Performance Class-D Amplifier
• Up to 111dB Dynamic Range (A-Weighted)
• 10μV Output Noise (Single-Cell Mode)
RMS
• 14.5μV Output Noise (Two-Cell Mode)
RMS
High Output Power (THD+N ≤ 1%)
• 1.32W Output Power into 4Ω (V
• 2.4W Output Power into 4Ω (V
• 5.15W Output Power into 4Ω (V
• 9.1W Output Power into 4Ω (V
High Amplifier Efficiency (Playback Only Power)
• 76% Efficiency at 0.1W into 4Ω (V
• 85.5% Efficiency at 1W into 4Ω (V
• 90% Efficiency at 1W into 8Ω (V
Peak THD+N Better than -83dB at 1kHz
Low Total Quiescent Power
• 9.3mW (V = 3.7V, IV Feedback Disabled)
PVDD
• 13.9mW (V = 3.7V, IV Feedback Enabled)
PVDD
• 16.1mW (V = 5V, IV Feedback Enabled)
PVDD
• 22.5mW (V = 7.4V, IV Feedback Enabled)
PVDD
Low < 5µW Software Shutdown Power
1ms Turn-On Time (f = 48kHz, Ramp Disabled)
S
Five Sample Playback Delay (f
No External Reference Clock Required
Playback Sample Rates from 8kHz to 96kHz
Trimmed Class-D Switching Frequency for EMI Planning
Extensive Click-and-Pop Reduction Circuitry
Programmable ALC for Brownout Protection
Robust Short-Circuit and Thermal Protection
Available in Space-Saving Package:
2
• 2.93mm , 16-pin WLP (0.4mm Pitch)
AR/VR Wearables
LRA Haptic Drive
Smart Watches and IoT Devices
Gaming Devices
Notebooks and Tablets
appears at end of data sheet.
= 3.7V)
PVDD
= 5V)
PVDD
= 7.4V)
PVDD
= 10V)
PVDD
= 5V)
PVDD
= 5V)
PVDD
= 5V)
PVDD
< 50kHz, f = 1kHz)
S IN
19-101683; Rev 0; 3/23