PAM8965

Description

The PAM8965 is an extremely high-efficiency Class-D stereo audio power amplifier with an integrated synchronous boost converter. The PAM8965 can drive two channels with 12W each into 4Ω speakers.

The integrated amplifier can achieve system efficiency of 92% (at VBAT = 7.4V). The device consumes exceptionally low quiescent current (10mA at VBAT = 7.4V) and very low shutdown current (0.7μA).

The integrated current-mode boost converter provides regulated power to a feature-laden Class-D stereo amplifier. These include:

Spread spectrum modulation (SSM) for EMI suppression (audio and boost), which enables the use of inexpensive ferrite bead filters.

Non-clipping power limit, which uses 41-step automatic gain control.

Thermal foldback, which reduces output power as the chip heats up.

External audio feedback pins, which allow for customization of sound by using feedback network design. Alternatively, these pins can be used for Kelvin connection to speaker terminals.

GAIN pin to program audio gain at 0.5dB steps such that external resistors are not required to adjust gain, which can result in gain error.

Out-of-audio switching for the boost converter, which minimizes audible noise coming from components on the board.

Protection features include undervoltage and overvoltage protection on VBAT, overvoltage protection on PVDD, short-circuit protection on all audio outputs, cycle-by-cycle current limit on boost converter, thermal shutdown of the entire system, DC protection for speakers, and an FLT pin that provides a fault flag.  

Feature(s)

• Operates from 2.8V to 8.5V Supply
• 2 x 12W (10% THD+N) into 4Ω Load with V_BAT = 7.4V (2SxP)
• 2 x 8W (10% THD+N) into 6Ω Load with V_BAT = 3.7V (1SxP)
• Auto Gain Control Responds to:
• Thermal Foldback
• Non-Clip Power Limit
• GAIN Pin
• Externally Adjustable Gain from 26dB to 6dB with 0.5dB Steps
• Exceptionally High Overall System Efficiency (92% @ V_BAT = 7.4V)
• Very Low I_Q = 10mA (V_BAT = 7.4V) for Boost + Stereo
• Very Low Shutdown Current = 0.7μA
• DC Protection for Speaker
• Auto-Recovery on Short-Circuit Protection & Thermal Shutdown
• External Audio Feedback Pins
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
• For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/

Application(s)

• Portable electronics
• Bluetooth speakers
• Wireless speakers
• Music instruments
• High-capacitance piezo actuator drives
• Virtual reality 3D active feedbacks
• PDAs, GPS, game machines