Diodes Incorporated PAM8902AZER

Overview

PAM8902AZER from Diodes Incorporated is a mono Class-D audio amplifier with integrated 1.5MHz boost converter, designed specifically for driving piezoelectric and ceramic speakers. It delivers 30VPP (10.6VRMS) output from a 3.6V supply, supports selectable gain (18/22/26dB), features anti-saturation clipping prevention, and operates within 2.7–5.5V input range. Used in portable audio devices requiring high-voltage speaker drive with minimal external components.

For engineers reviewing the PAM8902AZER datasheet, PAM8902AZER pinout, PAM8902AZER application, or PAM8902AZER equivalent, key selection criteria include its 17.5V boost output capability, differential input architecture, thermal/UVLO/OVP protection, and CSP-16 package compatibility with space-constrained handheld designs.

Technical Context

The PAM8902AZER integrates a fixed-frequency 1.5MHz boost converter with programmable output (8V/12V/17.5V) and a fully differential Class-D amplifier stage switching at 225–475kHz. Its anti-saturation function dynamically reduces gain in 0.25dB steps upon PWM duty-cycle detection to prevent clipping.

It employs dual ground domains (PGND1 for boost, PGND2 for Class-D), separate analog/digital supplies (AVDD/PVCC), and supports three precision gain settings via GSET pin configuration - all while maintaining 90dB SNR and 0.3% THD+N at 5VRMS output.

Key Specifications

Pinout & Package

Package: 1.95mm × 1.95mm, 16-bump CSP (Chip Scale Package) - optimized for ultra-thin mobile form factors with minimal PCB footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mono Class-D piezo driver applications.

Compared with TAS5707RTWR and PAM8904AYCR, the PAM8902AZER uniquely combines on-chip 17.5V boost, 30VPP output, and anti-saturation in a 1.95mm² CSP - making it optimal for cost-sensitive, space-constrained portable audio where external power conversion must be avoided.

Availability

PAM8902AZER is available at Aetrix Electronics and suitable for wireless handsets, portable DVD players, and electronic dictionaries requiring stable component supply with guaranteed long-term sourcing.

Supply support for PAM8902AZER 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 manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and audio solutions for consumer and industrial markets.

The PAM8902A belongs to Diodes' Piezo/Ceramic Speaker Driver product line - engineered to replace mechanical buzzers and electromagnetic speakers with high-efficiency, low-profile solid-state audio actuation.

FAQ

What is the minimum recommended input capacitance for PAM8902AZER?

The input capacitor (CI) forms a high-pass filter with the amplifier's input impedance (RI). For flat bass response down to 150Hz with RI ≈ 150kΩ, CI should be ≥10nF. A low-leakage ceramic or tantalum capacitor is required to avoid DC offset that reduces headroom - polarized types must orient the positive terminal toward the amplifier input.

Can the external Schottky diode be omitted in PAM8902AZER designs?

Yes - only under strict conditions: VSET set to Low or Floating, output capacitance CL < 1µF, signal frequency < 4kHz, or haptic use (50–500Hz). In all other cases - especially at 17.5V boost and full-bandwidth audio - the external Schottky diode is mandatory to maintain efficiency and prevent internal diode thermal failure.

How does the anti-saturation function affect audio latency?

The anti-saturation circuit introduces no fixed latency; gain adjustment occurs only during sustained overdrive. Attack time is 100µs per 0.25dB step, and release is 186ms per step - meaning transient peaks pass unaltered, while prolonged clipping triggers gradual gain reduction without interrupting signal continuity or introducing audible pumping artifacts.

Is PAM8902AZER pin-compatible with PAM8902AKER (QFN-16)?

No - although both share identical pin functions and electrical behavior, the CSP-16 (PAM8902AZER) and QFN-16 (PAM8902AKER) packages have different bump/pad layouts and thermal characteristics. The CSP version has θJA = 90–220°C/W versus QFN's 37°C/W, requiring distinct PCB thermal relief design and reflow profile validation.