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MAX98357A/
MAX98357B
Tiny, Low-Cost, PCM Class D Amplifier with
Class AB Performance
General Description
Features
The MAX98357A/MAX98357B is an easy-to-use, low-cost,
digital pulse-code modulation (PCM) input Class D ampli-
fier that provides industry-leading Class AB audio perfor-
mance with Class D efficiency. The digital audio interface
automatically recognizes up to 35 different PCM and TDM
● Single-Supply Operation (2.5V to 5.5V)
● 3.2W Output Power into 4Ω at 5V
● 2.4mA Quiescent Current
● 92% Efficiency (R = 8Ω, P
= 1W)
OUT
Output Noise (A = 15dB)
V
L
2
● 22.8μV
clocking schemes which eliminates the need for I C pro-
RMS
gramming. Operation is further simplified by eliminating
the need for an external MCLK signal that is typically used
for PCM communication. Simply supply power, LRCLK,
BCLK, and digital audio to generate audio! Furthermore,
a novel pinout allows customers to use the cost-effective
WLP package with no need for expensive vias (refer
to Application Note 6643: Optimize Cost, Size, and
Performance with MAX98357 WLP for more information).
● Low 0.013% THD+N at 1kHz
● No MCLK Required
● Sample Rates of 8kHz to 96kHz
● Supports Left, Right, or (Left/2 + Right/2) Output
● Sophisticated Edge Rate Control Enables
Filterless Class D Outputs
● 77dB PSRR at 1kHz
The digital audio interface is highly flexible with the
● Low RF Susceptibility Rejects TDMA
2
MAX98357A supporting I S data and the MAX98357B
Noise from GSM Radios
supporting left-justified data. Both ICs support 8 channel
time division multiplexed (TDM) data. The digital audio
interface accepts specified sample rates between 8kHz
and 96kHz for all supported data formats. The ICs can
be configured to produce a left channel, right channel, or
(left/2 + right/2) output from the stereo input data. The ICs
● Extensive Click-and-Pop Reduction Circuitry
● Robust Short-Circuit and Thermal Protection
● Available in Space-Saving Packages:
1.345mm x 1.435mm WLP (0.4mm Pitch)
and 3mm x 3mm TQFN
2
operate using 16/24/32-bit data for I S and left-justified
● Solution Size with Single Bypass Capacitor is
modes as well as 16-bit or 32-bit data using TDM mode.
The ICs eliminate the need for the external MCLK signal
that is typically used for PCM communication. This reduc-
es EMI and possible board coupling issues in addition to
reducing the size and pin count of the ICs.
4.32mm2
Applications
● Single Li-ion Cell/5V Devices
● Smart Speakers
● Notebook Computers
● IoT Devices
● Gaming Devices (Audio and Haptics)
● Smartphones
The ICs also feature a very high wideband jitter toler-
ance (12ns typ) on BCLK and LRCLK to provide robust
operation.
Active emissions-limiting, edge-rate limiting, and over-
shoot control circuitry greatly reduce EMI. A filterless
spread-spectrum modulation scheme eliminates the need
for output filtering found in traditional Class D devices and
reduces the component count of the solution.
● Tablets
● Cameras
Simplified Block Diagram
The ICs are available in 9-pin WLP (1.345mm x 1.435mm
x 0.64mm) and 16-pin TQFN (3mm x 3mm x 0.75mm)
packages and are specified over the -40°C to +85°C tem-
perature range.
SHUTDOWN
AND
CHANNEL
SELECT
GAIN
CONTROL
MAX98357A
MAX98357B
Ordering Information appears at end of data sheet.
Functional Diagram appears at end of data sheet.
CLASS D
OUTPUT
STAGE
DIGITAL
AUDIO
INTERFACE
PCM
INPUT
DAC
19-6779; Rev 13; 7/19
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