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MAX98358
PDM Input Class D Audio Power Amplifier
General Description
Features
● Single-Supply Operation (2.5V to 5.5V)
The MAX98358 is a digital pulse-density modulated
(PDM) input Class D power amplifier that provides Class
AB audio performance with Class D efficiency. This IC
offers five selectable gain settings (3dB, 6dB, 9dB, 12dB,
and 15dB) set by a single gain-select input (GAIN). The IC
can be configured to produce a left channel, right channel,
or (left/2 + right/2) output from the stereo input data.
● 3.2W Output Power into 4Ω at 5V
● 1.8mA Quiescent Current (V
= 3.7V)
= 1.5W)
DD
OUT
● 92% Efficiency (R = 8Ω, P
L
● 29µV
Output Noise (A = 6dB)
V
RMS
● Low 0.013% THD+N at 1kHz
The MAX98358 takes a stereo pulse density modulated
(SPDM) input signal directly into the DAC. Data on the
rising edge of PDM_CLK is considered left-channel data
while data on the falling PDM_CLK edge is right channel.
A mono sum feature is also implemented with SPDM data
input by summing the data from both rising and falling
clock edges.
● Supported PDM_CLK Rates of 1.84MHz–4.32MHz
and 5.28MHz–8.64MHz
● Supports Left, Right, or Left/2 + Right/2 Outputs
● Sophisticated Edge Rate Control Enables Filterless
Class D Outputs
● 77dB PSRR at 217Hz
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.
● Low RF Susceptibility Rejects TDMA
Noise from GSM Radios
● Extensive Click-and-Pop Reduction Circuitry
● Robust Short-Circuit and Thermal Protection
The IC is 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 is specified over the -40°C to +85°C tem-
perature range.
● Available in Space-Saving Packages:
1.345mm x 1.435mm WLP (0.4mm Pitch)
3mm x 3mm TQFN
Applications
● Notebook and Netbook Computers
Simplified Block Diagram
● Cellular Phones
● Tablets
● Portable Media Players
SHUTDOWN
AND
CHANNEL
SELECT
GAIN
CONTROL
MAX98358
Ordering Information and Functional Diagram appears at
end of data sheet.
CLASS D
OUTPUT
STAGE
DIGITAL
AUDIO
INTERFACE
PDM
INPUT
DAC
19-6786; Rev 6; 10/19