Diodes Incorporated PAM8906M1018-13

Overview

PAM8906M1018-13 from Diodes Incorporated is a piezoelectric sounder driver IC with integrated 1.8MHz fixed-frequency boost converter, delivering up to 36VPP differential output across OUTP/OUTN for driving two- or three-terminal piezo elements. It operates from 2.1V–5.5V input, supports self-excitation mode (10V/12V only) and external PWM control, and features thermal shutdown, overcurrent, overvoltage, and undervoltage lockout protections. Designed for battery-powered smoke/gas alarms requiring fast startup (770µs), low quiescent current (<1µA shutdown), and high SPL output.

For engineers reviewing the PAM8906M1018-13 datasheet, PAM8906M1018-13 pinout, PAM8906M1018-13 application in piezo alarm systems, or PAM8906M1018-13 equivalent for 18V boost piezo drivers, this page provides verified functional context, validated pin roles, real-world timing behavior, protection thresholds, and alternative selection guidance based on documented voltage options and operational modes.

Technical Context

The PAM8906M1018-13 implements a current-mode boost regulator with 1.8MHz switching frequency, enabling use of a compact 1µH inductor and minimizing EMI. Its piezo driver stage delivers high-speed turn-on/turn-off with 7.5Ω high-side and 3Ω low-side R_DS(ON), supporting up to 150nF capacitive load at frequencies up to 10kHz (or >100kHz for ≤10nF ultrasonic loads).

It integrates an internal LDO supplying 5V to internal blocks, auto wake-up/shutdown triggered by DIN logic level duration (>100ms low disables boost), and dual-mode operation: external PWM input or self-excitation (10V/12V variants only). The 18V version (M1018-13) is restricted to external PWM drive and requires FB connected to VOUT for two-terminal sounders.

Key Specifications

Pinout & Package

The PAM8906M1018-13 is housed in a thermally enhanced MSOP-10 package (3.0mm × 4.9mm, 0.5mm pitch), optimized for high-density PCB layouts and automated SMT assembly with 105°C/W θ_JA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PAM8906M1018-13, the 12V variant offers self-excitation capability but lower SPL, while TAS2505IRGET adds digital configurability at the cost of external power conversion and higher BOM count.

Availability

PAM8906M1018-13 is available at Aetrix Electronics and suitable for smoke/gas alarms, industrial security panels, and ultrasonic humidifier designs requiring stable component supply, long-lifecycle availability, and RoHS-compliant manufacturing.

Supply support for PAM8906M1018-13 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 protection solutions for industrial, consumer, and automotive markets.

The PAM8906 belongs to Diodes' piezo driver product line, engineered specifically for low-power, high-reliability audible alert systems where battery life, fast response, and integrated protection are critical.

FAQ

Can PAM8906M1018-13 operate in self-excitation mode?

No. Self-excitation mode is explicitly supported only for the 10V and 12V versions (M1010-13 and M1012-13) per the datasheet. The M1018-13 variant is designed exclusively for external PWM input drive, as its higher 18V boost output requires precise timing control to avoid overvoltage stress on piezo elements.

What is the maximum recommended piezo capacitance for PAM8906M1018-13?

The absolute maximum piezo loading capacitance is 150nF, as specified in the Electrical Characteristics table. For optimal efficiency and thermal performance at 18V output, Diodes recommends limiting load capacitance to ≤100nF in continuous-duty applications such as industrial alarms, with additional 10µF bulk capacitance at VOUT if exceeding 100nF.

Does PAM8906M1018-13 require an external Schottky diode?

No - the Schottky diode is optional. When added between SW and VOUT, it reduces power dissipation by ~20% by bypassing the internal synchronous rectifier's conduction loss. For battery-critical applications like smoke alarms, inclusion improves runtime but adds cost and board area; omission is acceptable for moderate-duty cycles.

How does the FB pin function in PAM8906M1018-13 for two-terminal piezo sounders?

For two-terminal piezo sounders, the FB pin must be connected directly to VOUT to close the boost output voltage regulation loop. This configuration disables three-terminal feedback functionality and ensures stable 18V output regardless of piezo impedance variations, as confirmed in the Typical Application Circuit (I) and Pin Descriptions section.