PAM8965 12W STEREO CLASS-D AUDIO AMPLIFIER WITH SYNCHRONOUS BOOST, SSM AND EXTERNAL AUDIO FEEDBACK Description Pin Assignments The PAM8965 is an extremely high-efficiency Class-D stereo audio (Top View) power amplifier with an integrated synchronous boost converter. The PAM8965 can drive two channels with 12W each into 4 speakers. The integrated amplifier can achieve system efficiency of 92% (at V = 7.4V). The device consumes exceptionally low quiescent BAT 40 39 38 37 36 35 34 33 32 31 current (10mA at VBAT = 7.4V) and very low shutdown current 1 30 FLT VBAT1 (0.7A). 2 29 EN VBAT2 3 28 The integrated current-mode boost converter provides regulated RINP PVDD power to a feature-laden Class-D stereo amplifier. These include: 4 27 RINN PVDD 5 26 LINN BST Spread spectrum modulation (SSM) for EMI suppression (audio and 6 PAM8965 25 LINP SW boost), which enables the use of inexpensive ferrite bead filters. 7 24 SSM SW YYWWXX Non-clipping power limit, which uses 41-step automatic gain control. 23 8 VDD PGND 9 22 Thermal foldback, which reduces output power as the chip heats up. GND PGND 10 21 GND GAIN External audio feedback pins, which allow for customization of sound 11 12 13 14 15 16 17 18 19 20 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. W-QFN5050-40 (Type US) Out-of-audio switching for the boost converter, which minimizes audible noise coming from components on the board. Protection features include under-voltage and over-voltage protection on VBAT, over-voltage 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. Applications Features Portable electronics Operates from 2.8V to 8.5V Supply Bluetooth speakers 2 12W (10% THD+N) into 4 Load with V = 7.4V (2SxP) BAT Wireless speakers 2 8W (10% THD+N) into 6 Load with V = 3.7V (1SxP) BAT Music instruments Auto Gain Control Responds to: High-capacitance piezo actuator drives Thermal Foldback Virtual reality 3D active feedbacks Non-Clip Power Limit PDAs, GPS, game machines 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 = 10mA (V = 7.4V) for Boost + Stereo Q BAT Very Low Shutdown Current = 0.7A 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. PVDD BST SW VBAT2 VBAT1 PAM8965 Typical Applications Circuit 2.8V to 8.5V + FLT RFBP ON EN OFF RBSTP ROUTP RINP ROUTN Right Input RBSTN RINN PAM8965 RFBN LINP Left Input LINN LFBP ON LBSTP OFF SSM LOUTP PLIM PLIM LOUTN GAIN GAIN LBSTN VDD VDD LFBN GND PGND Pin Descriptions Pin Number Pin Name I/O/P Description 1 FLT O Fault flag. Open-drain output to signal system faults (VBAT UVLO or OVLO, OTP, DC input, audio SCP) 2 EN I Chip enable. High = ON, Low = OFF. Do not float this pin. 3 RINP I Right channel audio input Positive 4 RINN I Right channel audio input Negative 5 LINN I Left channel audio input Negative 6 LINP I Left channel audio input Positive 7 SSM I Spread spectrum modulation. High = ON, Low = OFF. Do not float this pin. 8 VDD O Internal 5V LDO 9, 10 GND Analog signal ground 11 PLIM I Non-clip power limit setting. PLIM = VDD disables power limit. Do not float this pin. 12, 20 PGND Power ground for left channel 13 LFBP I Left channel feedback Positive. Short to LOUTP. Kelvin connect to speaker for higher performance. 14 LOUTP O Left channel audio output Positive 15 LBSTP P Left channel boot-strap supply for high-side Positive 16 LPVDD P Left channel power supply for Class-D H-bridge 17 LBSTN P Left channel boot-strap supply for high-side Negative 18 LOUTN O Left channel audio output Negative 19 LFBN I Left channel feedback Negative. Short to LOUTN. Kelvin connect to speaker for higher performance. Audio channel gain setting. Do not float this pin. 4.5V or above = 26dB (maximum gain setting). 21 GAIN I Then every 100mV is 0.5dB step, e.g., 4.4V = 25.5dB, 4.3V = 25dB, etc. 0.5V or below = 6dB (minimum gain setting) 22, 23 PGND Power ground for boost converter 24, 25 SW O Boost converters switching node 26 BST P Boost converters boot-strap supply 27, 28 PVDD O Boost converters output. Connect this to pin 16 and pin 35. 29 VBAT2 P Battery supply input for boost converter. See Application Information for decoupling requirement. 30 VBAT1 P Battery supply input for system. See Application Information for decoupling requirement. 31, 39 PGND Power ground for right channel 32 RFBN I Right channel feedback Negative. Short to ROUTN. Kelvin connect to speaker for higher performance. 33 ROUTN O Right channel audio output Negative 34 RBSTN P Right channel boot-strap supply for high-side Negative 35 RPVDD P Right channel power supply for Class-D H-bridge 36 RBSTP P Right channel boot-strap supply for high-side Positive 37 ROUTP O Right channel audio output Positive 38 RFBP I Right channel feedback Positive. Short to ROUTP. Kelvin connect to speaker for higher performance. 40 GND Connect to system ground 2 of 25 February 2022 PAM8965 Diodes Incorporated www.diodes.com Document number: DS42707 Rev. 3 - 2 +