Diodes Incorporated PAM8620TR

Overview

PAM8620TR from Diodes Incorporated is a 20W per channel stereo Class-D audio power amplifier in W-QFN5050-32 package, delivering 0.2% THD+N at 1 kHz into 4Ω/8Ω loads, >90% efficiency at 12V/24V supply (8–26V), and integrated power-limiting with non-clip operation for flat-panel TVs and multimedia speaker systems.

For engineers reviewing the PAM8620TR datasheet, PAM8620TR pinout, PAM8620TR application, or PAM8620TR equivalent, key selection considerations include differential input architecture, dual-channel H-bridge output topology, thermal shutdown at +160°C, bootstrap capacitor requirements (220nF min), and PL-pin programmable power limiting for speaker protection.

Technical Context

The PAM8620TR implements a fully differential input stage with 32 dB fixed gain and internal 2.5 V bias (V2P5) for optimal common-mode range, paired with two independent Class-D half-bridge outputs per channel using nMOS-only H-bridges requiring external bootstrap capacitors (BSLP/BSLN, BSRP/BSRN).

It integrates analog supply regulation (AVDD = 5 V), power supply ripple rejection (−65 dB PSRR), overtemperature shutdown (+160°C trip, +50°C hysteresis), short-circuit latched protection, and a dedicated PL pin enabling adjustable peak output voltage limiting via external resistor-to-ground to prevent speaker damage during transients.

Key Specifications

Pinout & Package

Package: W-QFN5050-32 (5.0 mm × 5.0 mm, 0.75 mm height, exposed thermal pad). Requires soldered thermal pad connection to PCB ground plane for ΘJC = 5.0°C/W thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo Class-D audio amplifier applications.

Compared with TAS5756M and MAX9744, the PAM8620TR uniquely combines analog-differential inputs, programmable non-clip power limiting, >90% efficiency in QFN packaging, and integrated 5V AVDD - making it optimal for space- and thermal-constrained consumer audio with analog sources.

Availability

PAM8620TR is available at Aetrix Electronics and suitable for flat-panel displays, multimedia speaker systems, and DVD/Blu-ray players requiring stable component supply, consistent parametric performance across production lots, and long-term lifecycle support.

Supply support for PAM8620TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs, with manufacturing certified to IATF 16949 and product definitions aligned to AEC-Q standards.

The PAM8620TR belongs to Diodes' Class-D audio amplifier product line, engineered specifically for high-efficiency, low-EMI stereo playback in space-constrained consumer electronics - emphasizing thermal robustness, speaker protection, and minimal external component count.

FAQ

What is the minimum recommended capacitor value for the V2P5 pin?

A minimum 0.47 µF ceramic capacitor is required on the V2P5 pin to ensure proper startup timing and high-frequency noise filtering for the internal 2.5 V bias generator. This value stabilizes the preamplifier common-mode operating point and prevents audible pop during power-up. Larger values (e.g., 1 µF) further reduce noise but extend startup time slightly.

How does the PL (Power Limit) pin function in practice?

The PL pin accepts a DC voltage (0.6–1.7 V) set by a resistor-to-ground to define maximum peak output voltage. When output demand exceeds this limit, the amplifier automatically reduces gain to prevent clipping while maintaining audio fidelity. For example, a 100 kΩ resistor yields ~1.0 V at PL and limits output to ~8.2 W into 8Ω at 24V - ideal for protecting 10W-rated tweeters.

Can the PAM8620TR drive 4Ω and 8Ω speakers simultaneously on the same device?

Yes - the PAM8620TR is rated for 20W × 2 into both 4Ω and 8Ω loads continuously at 12–24V supply. Its dual independent H-bridge architecture allows left/right channels to drive mismatched impedances (e.g., 4Ω woofer + 8Ω tweeter) without crosstalk or thermal imbalance, provided each channel's PVCC/PGND pair is properly decoupled.

What thermal design practices are mandatory for reliable operation?

The exposed thermal pad (Pin 33) must be soldered to a minimum 100 mm² copper pour connected to system ground. Without this, junction-to-ambient thermal resistance rises from 16.1°C/W to >40°C/W, risking thermal shutdown above 5W/channel. Use ≥4 thermal vias (0.3 mm diameter) under the pad and avoid covering the pad with solder mask.