AU3138SATSSOP28P
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10W, 3.5V to 14.4V, Inductor Free, Stereo Class-D Speaker Amplifier
Product details
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Parameters
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Characteristics
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Package
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Description
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Input Type: Analog Input
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Architecture: Closed-loop Class D
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Number of Channels: Stereo 2 Channels
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Operating Voltage Range: 4.5V to 14.5V
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Output Power: 2 × 10W
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THD + N
0.03%
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Control Interface: GPIO
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Operating Temperature Range (°C): -40 to 85
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Output Power
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− 2 × 11W @12V, 6Ω, THD+N = 1%
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− 2 × 15.5W @12V, 4Ω, THD+N = 1%
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− 1 × 21W @12V, 4Ω, THD+N = 1%
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− THD+N < 0.04% @12V, 6Ω, 1W, 1kHz
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Supply Voltage Range
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For TV applications (AU3138M/AU3138P): 8V to 14.5V
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For audio applications (AU3138S/AU3138T): 3.5V to 14.5V
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Low Rdson: 140mΩ
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Variable Gain
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− 20dB and 26dB (AU3138M/AU3138S)
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− 32dB and 36dB (AU3138P/AU3138T)
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Low Quiescent Power Consumption
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Idle current in 1SPW mode is 16mA (at 12V)
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Efficiency > 90%
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Supports No-Inductor Solution
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Output uses ferrite bead
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When operating in inductor-less mode, it can pass the EMC standards EN55013 and EN55022
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Standard
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No external heatsink required
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Flexible Audio Solution
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Single-ended or differential analog inputs
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Integrated Protection and Automatic Recovery
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Pin-to-pin, pin-to-ground, and pin-to-power short-circuit protection
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Thermal protection, undervoltage protection, and overvoltage protection
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Power Limiter and DC Speaker Protection
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Package
TSSOP28PP
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TSSOP28: 9.7mm × 4.4mm
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The AU3138 is a 10W per channel, high-efficiency, low idle current Class D stereo audio amplifier. It can drive stereo speakers with a load as low as 3.2Ω. In 1SPW mode, it consumes only 16mA (at 12V) of idle current, thereby extending audio playback time and improving performance for Bluetooth speakers, battery-powered devices, and other power-sensitive applications. The AU3138 features advanced EMI suppression with spread-spectrum control, which allows the use of inexpensive ferrite bead filters while meeting EMC requirements to reduce system costs. For TV applications, the undervoltage protection threshold of the AU3138M/AU3138P is set at 7.5V, which effectively prevents pop noise during power loss. For audio applications with battery power or low supply voltage, the AU3138S/AU3138T supports a minimum operating voltage of 3.5V. To further simplify the design, the AU3138 integrates essential protection functions, including undervoltage, overvoltage, power limiting, short-circuit, overtemperature, and DC speaker protection. All these protections come with automatic recovery functionality.
