Diodes Incorporated PAM8904EGPR

Overview

PAM8904EGPR 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 47nF capacitive load. It operates across 1.5–5.5V input, features automatic standby/wake-up control, and is used in alarm clocks, security devices, and healthcare systems.

For engineers reviewing the PAM8904EGPR datasheet, PAM8904EGPR pinout, PAM8904EGPR application, or PAM8904EGPR equivalent, key selection criteria include its 3x boost capability (up to 13.5V), differential/single-ended output configuration, thermal/overcurrent/UVLO protection, and W-QFN2020-12 (Type US) package compatibility with space-constrained audio alert designs.

Technical Context

The PAM8904EGPR implements a fixed-frequency (70–130kHz) charge pump architecture with selectable 1x/2x/3x voltage multiplication via EN1/EN2 logic inputs. Its dual-output stage (VO1/VO2) supports both differential and single-ended piezo drive modes, enabling flexible acoustic output tuning without external H-bridge components.

Control logic integrates automatic shutdown after 42ms of DIN inactivity and restarts on valid signal detection, while internal short-circuit protection limits output current to 49mA without latching. Thermal shutdown activates at 150°C junction temperature and recovers autonomously upon cooling.

Key Specifications

Pinout & Package

Package: W-QFN2020-12 (Type US), 2.0mm × 2.0mm × 0.75mm body, 0.4mm pitch, matte tin-plated leads, 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 TPS61085 and BD7122FVM, the PAM8904EGPR uniquely integrates boost conversion, signal conditioning, and protected output drive in one W-QFN2020-12 package-reducing total solution size by 65% and eliminating six external components typically needed in discrete implementations.

Availability

PAM8904EGPR is available at Aetrix Electronics and suitable for alarm clocks, security devices, healthcare systems, and home appliances requiring stable component supply and long-term production continuity.

Supply support for PAM8904EGPR 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 for power management, signal integrity, and connectivity applications.

The PAM8904EGPR belongs to Diodes' audio driver product line, engineered specifically for ultra-low-power piezoelectric alert generation in battery-operated consumer and medical electronics.

FAQ

What is the maximum recommended piezo capacitance for PAM8904EGPR?

The PAM8904EGPR is characterized and guaranteed to drive up to 47nF capacitive load across all operating modes. Exceeding this value may cause extended tON startup delay, reduced output amplitude, or instability in 3x boost mode due to insufficient charge pump current delivery. For loads above 47nF, derating VIN or selecting 2x mode is advised.

Can PAM8904EGPR operate from a 1.8V supply?

Yes, PAM8904EGPR supports 1.5V to 5.5V input range. At 1.8V, it delivers 1.8VPP (1x), 3.6VPP (2x), or 5.4VPP (3x) output-sufficient for low-SPL indicators. However, 3x mode output is capped at 13.5V, so VIN must remain ≤4.5V in that configuration to avoid exceeding absolute maximum ratings.

How does the automatic shutdown/wake-up function work?

When DIN remains low for >42ms, the IC enters ultra-low-current shutdown (ISD ≤1µA). A rising edge on DIN triggers wake-up: charge pump starts, VOUT ramps within 470µs (1x) to 1.91ms (3x), then VO1/VO2 begin driving the piezo. No external wake-up circuitry or MCU intervention is required.

Is thermal shutdown reversible without power cycling?

Yes, thermal shutdown is fully autonomous and reversible. When junction temperature exceeds +150°C, outputs and charge pump disable immediately. Once die temperature falls below the hysteresis threshold (~140°C), normal operation resumes automatically-no reset signal or power interruption is needed.