Diodes Incorporated PAM8904JPR

Overview

PAM8904JPR from Diodes Incorporated is a piezo sounder driver IC with integrated 1x/2x/3x charge pump boost converter, delivering up to 18VPP output from a 3V supply and supporting 15nF capacitive load. It operates across 1.8–5.5V input, features automatic standby/wake-up control, and is packaged in a 12-pin U-QFN3030-12 (Type A) for compact alarm clock and security device designs.

For engineers reviewing the PAM8904JPR datasheet, PAM8904JPR pinout, PAM8904JPR application, or PAM8904JPR equivalent, this page provides verified technical context, real-world timing behavior (tON = 270–350µs), differential/single-ended output configuration, thermal shutdown, and overcurrent protection - all critical for low-power audible alert system design.

Technical Context

The PAM8904JPR implements a fixed-frequency 1.0MHz charge pump with selectable 1x/2x/3x voltage multiplication, enabling VOUT generation of 2.8–9V depending on mode and input voltage. Its dual-output architecture (VO1/VO2) supports both differential drive (7.9mA max operating current in 3x mode) and single-ended configurations.

Control logic interprets EN1/EN2 states to select operating mode or force shutdown, while DIN accepts 4kHz rectangular pulses to trigger output activation after tON delay (270–350µs). Built-in short-circuit protection limits output current to 40mA without latching, and thermal shutdown activates at TJ = +150°C with automatic recovery.

Key Specifications

Pinout & Package

Package: 12-pin U-QFN3030-12 (Type A), 3.0mm × 3.0mm × 0.6mm, exposed thermal pad, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar piezo sounder driver applications.

Compared with DRV8662 and BD7301KV, the PAM8904JPR uniquely combines integrated 3x charge pump, 18VPP output, ≤1µA shutdown, and 12-pin U-QFN3030-12 packaging - making it optimal for compact, long-life, high-SPL piezo alert systems.

Availability

PAM8904JPR is available at Aetrix Electronics and suitable for healthcare alarms, home appliance alerts, security system sirens, and alarm clock tones requiring stable component supply and consistent parametric performance across production batches.

Supply support for PAM8904JPR 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 high-reliability power management, signal integrity, and audio solutions for industrial and consumer markets.

The PAM8904 belongs to Diodes' piezo driver product line, engineered specifically for low-power, high-voltage-swing audible alert generation in space- and battery-constrained applications.

FAQ

What is the maximum piezo capacitance the PAM8904JPR can drive reliably?

The PAM8904JPR is specified to drive up to 15nF capacitive load, as confirmed in its Electrical Characteristics table under "Operating Current" test conditions. This value corresponds to typical ceramic piezo sounders used in alarm clocks and security devices. Exceeding 15nF may degrade tON response time and reduce peak output voltage due to increased charge demand on the internal charge pump.

Can the PAM8904JPR operate from a 1.8V supply in 3x mode?

No - the datasheet explicitly restricts 3x mode to VIN ≤ 4.5V to prevent VOUT from exceeding its 13.5V absolute maximum rating. At 1.8V input, only 1x (2.8–3V VOUT) and 2x (5.2–6V VOUT) modes are valid. Attempting 3x mode at 1.8V yields ~5.4V VOUT, which is electrically safe but violates the intended use case and is not characterized in electrical specs.

How does the automatic shutdown/wake-up feature work without external control?

The PAM8904JPR monitors the DIN pin continuously. After detecting a high-to-low transition, it waits 42ms (tOFF) before entering ≤1µA shutdown. A subsequent rising edge on DIN wakes it immediately, initiating the charge pump and output drive after tON delay (270–350µs). No external timer or MCU intervention is needed - the logic is fully self-contained within the IC.

Is the U-QFN3030-12 (Type A) package thermally enhanced compared to the U-QFN2020-12 (Type UX)?

Yes - the U-QFN3030-12 (Type A) has θJA = 35°C/W, while the smaller U-QFN2020-12 (Type UX) has θJA = 68°C/W. This 94% higher thermal resistance means the UX variant heats up significantly faster under identical load. For continuous 3x-mode operation driving 15nF, the Type A package enables higher duty cycles and longer burst durations before triggering thermal shutdown at +150°C.