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Diodes Incorporated PAM8904JER
- Part No.:
- PAM8904JER
- Manufacturer:
- Diodes Incorporated
- Category:
- Specialized ICs
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
PAM8904JER.pdf
- Description:
- IC PIEZO SOUNDER DRVR 16UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:73,957
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Product details
Overview
PAM8904JER from Diodes Incorporated is a piezo sounder driver IC with integrated 1.0MHz charge pump boost converter, delivering up to 18VPP output from a 3V supply and supporting 1x/2x/3x voltage multiplication modes. It drives ceramic/piezo sounders up to 15nF load in differential or single-ended configurations and includes thermal shutdown, overcurrent protection, and automatic standby/wake-up for battery-powered alarm clocks and security devices.
For engineers reviewing the PAM8904JER datasheet, PAM8904JER pinout, PAM8904JER application, or PAM8904JER equivalent, this page provides verified package mapping (U-QFN3030-16 Type B), confirmed charge pump timing (tON = 270–350µs), real-world output capability (18VPP @ 3V VIN), and validated alternative options for piezo driver replacement in low-power audible alert systems.
Technical Context
The PAM8904JER implements a fixed-frequency 1.0MHz charge pump with selectable 1x/2x/3x gain via EN1/EN2 logic inputs, enabling VOUT generation of 2.8V (1x), 5.2V (2x), or 7.2–9V (3x) from 1.8–4.5V input. Its dual-output architecture supports both differential (VO1/VO2) and single-ended (VO1-to-GND) drive modes with short-circuit protection that limits output current to 40mA without latching.
Operation is triggered by DIN signal edges, with mode-dependent startup delay (tON = 270–350µs) and 42ms shutdown delay (tOFF). Built-in undervoltage lockout, overvoltage protection (13.5V max VOUT), and thermal shutdown at +150°C ensure robust operation across -40°C to +85°C ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - Enables direct connection to Li-ion, coin-cell, or 3.3V/5V system rails without external LDO. |
| Output Voltage (1x Mode) | 2.8–3.0V - Matches ceramic sounder resonance requirements while minimizing EMI in low-noise medical alarms. |
| Output Voltage (3x Mode) | 7.2–9.0V - Delivers 18VPP differential swing for high-SPL piezo alerts in security panels without external transformer. |
| Charge Pump Frequency | 1.0MHz - Allows use of compact 1µF ceramic capacitors (CP1/CP2) and reduces PCB footprint vs. lower-frequency boosters. |
| Max Load Capacitance | 15nF - Supports standard 27mm–40mm piezo transducers used in home appliance beepers and healthcare device indicators. |
| Shutdown Current | 1µA - Extends battery life in intermittent-audio applications like smoke detectors with multi-year shelf life. |
| Thermal Shutdown Threshold | +150°C junction - Prevents thermal runaway during sustained high-duty-cycle audio bursts in enclosed enclosures. |
Pinout & Package
Package: U-QFN3030-16 (Type B), 3.0mm × 3.0mm × 0.6mm, 16-pin, exposed thermal pad, RoHS-compliant NiPdAu terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1, EN2 | Charge pump mode select inputs | Logic-controlled selection of 1x/2x/3x gain or forced shutdown; no pull-up required due to internal biasing. |
| DIN | Audible signal input | Accepts 4kHz rectangular pulses directly from MCU GPIO; no external AC coupling or level-shifting needed. |
| VO1, VO2 | Differential piezo drive outputs | Deliver complementary 18VPP swing across piezo element; enables higher acoustic output vs. single-ended drive. |
| VOUT | Boost converter output | Provides regulated 12V supply for internal circuitry; decoupled with 2.2µF capacitor to minimize ripple-induced noise. |
| CP1, CP2, CN1, CN2 | Charge pump capacitor terminals | Four dedicated pins for external flying capacitors; layout symmetry minimizes loop inductance and EMI. |
| VIN, GND | Main power and ground | VIN accepts 1.8–5.5V input; GND connects to exposed thermal pad for optimal heat dissipation in high-duty cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.0MHz charge pump | Eliminates need for external inductor and reduces BOM count by 4 components versus DC-DC boost solutions. |
| No voltage cross at shutdown | Prevents audible pop/click during power transitions-critical for patient-facing healthcare device compliance. |
| Automatic standby/wake-up | Reduces average system current by >99% between audio events without MCU intervention or firmware overhead. |
| Short-circuit protection | Self-resetting 40mA current limit prevents latch-up during piezo lead shorting or solder bridging on production line. |
| Thermal shutdown with auto-restart | Enables continuous operation in thermally constrained spaces (e.g., sealed smart thermostat housings) without manual reset. |
Applications
| Healthcare Alarms | Home Appliance Beepers |
|---|---|
|
Use Scenario: Audible alerts in portable blood glucose meters and pulse oximeters requiring low-power, high-reliability tone generation. IC Role / Device Role / Timing Role: Piezo driver providing 4kHz beeps with <1µA quiescent current between alerts and zero-pop shutdown behavior. Use Value: Extends CR2032 battery life beyond 2 years while meeting IEC 60601-1 audible output consistency requirements. |
Use Scenario: User feedback tones in microwave ovens, washing machines, and induction cooktops operating in high-temperature environments. IC Role / Device Role / Timing Role: Differential piezo driver delivering 18VPP output to overcome mechanical damping in metal-front appliances. Use Value: Achieves >85dB SPL at 10cm without external amplification, eliminating need for bulky speaker enclosures. |
| Security System Sirens | Industrial Control Panels |
|
Use Scenario: Intrusion alarm tones in battery-backed residential security hubs with 10-year backup battery targets. IC Role / Device Role / Timing Role: Charge pump-based driver enabling 3x mode (7.2–9V VOUT) from 3.3V system rail to maximize piezo efficiency. Use Value: Delivers full-rated acoustic output while consuming only 3.9mA in 3x differential mode-reducing battery drain by 40% vs. legacy drivers. |
Use Scenario: Status indication in factory HMIs and PLC operator panels exposed to vibration, dust, and wide temperature swings. IC Role / Device Role / Timing Role: Robust piezo interface with thermal shutdown and overvoltage protection for unattended 24/7 operation. Use Value: Survives 100,000+ power cycles and maintains consistent tone frequency across -40°C to +85°C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar piezo sounder driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Texas Instruments TPS61178 | Inductor-based 2.2MHz boost converter; requires external MOSFET and gate driver; no integrated piezo output stage. | Suitable for custom high-efficiency designs but adds 6+ components and layout complexity for piezo drive. | Select when system already uses inductor-based power architecture and needs programmable output voltage beyond 13.5V. |
| Rohm BD7123FVM | Fixed 12V boost output only; no 1x/2x/3x mode selection; lacks differential output configuration support. | Limited to single-ended piezo drive; cannot achieve 18VPP differential swing required for high-SPL alarms. | Choose only for cost-sensitive, low-SPL applications where 12VPP maximum output suffices and board space allows larger QFN2525-12. |
Compared with TPS61178 and BD7123FVM, the PAM8904JER uniquely integrates charge pump gain selection, differential piezo outputs, and sub-1µA shutdown-enabling complete piezo driver functionality in a single 3.0×3.0mm package with zero external active components.
Availability
PAM8904JER is available at Aetrix Electronics and suitable for healthcare alarms, home appliance beepers, and security system sirens requiring stable component supply and long-lifecycle availability.
Supply support for PAM8904JER 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 precision analog solutions for industrial, consumer, and automotive markets.
The PAM8904 belongs to Diodes' piezo driver product line, engineered specifically for ultra-low-power, high-reliability audible alert generation in battery-operated and thermally constrained systems.
FAQ
What is the maximum piezo capacitance the PAM8904JER can drive reliably?
The PAM8904JER is characterized and guaranteed to drive loads up to 15nF, matching common 27mm–40mm ceramic piezo elements. Driving beyond this value may cause extended tON startup time, reduced peak output voltage, or instability in 3x mode due to charge pump regulation limits.
Can the PAM8904JER operate from a 1.8V supply in all charge pump modes?
Yes-the PAM8904JER supports 1.8V minimum VIN across 1x and 2x modes per datasheet specifications. However, 3x mode is restricted to VIN ≤ 4.5V to prevent VOUT from exceeding its 13.5V absolute maximum rating; at 1.8V input, 3x mode yields only ~5.4V VOUT.
How does the automatic standby/wake-up function reduce system power consumption?
After DIN signal removal, the PAM8904JER waits 42ms before entering 1µA shutdown mode. This eliminates MCU polling overhead and ensures zero static current between audio events-reducing average power by >99% compared to always-on drivers in intermittent-tone applications.
Is the U-QFN3030-16 (Type B) package compatible with standard reflow profiles?
Yes-the PAM8904JER's U-QFN3030-16 package has Moisture Sensitivity Level 1 per J-STD-020 and uses NiPdAu terminations compatible with standard Pb-free reflow profiles (peak 260°C). The exposed thermal pad requires solder paste stencil design per Diodes' recommended pad layout (DS37246 Rev.6, Page 9).
PAM8904JER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Piezo Sounder Driver
- Applications:
- Health, Home, Security
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-QFN3030-16 (Type B)
- Grade:
- -
- Qualification:
- -
PAM8904JER FAQ
1.How can I place an order for PAM8904JER through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM8904JER on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PAM8904JER reliable?
The price and inventory of PAM8904JER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM8904JER is usually 5 days.
3.What payment methods are accepted for PAM8904JER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM8904JER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM8904JER?
PAM8904JER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM8904JER order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PAM8904JER?
For technical support, including PAM8904JER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM8904JER requirements.
6.How does Aetrix verify that PAM8904JER is sourced from the original manufacturer or authorized distributors?
All PAM8904JER products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PAM8904JER meets industry standards.
7.What is the process for return or replacement of PAM8904JER?
All PAM8904JER units undergo pre-shipment inspection (PSI). If there is an issue with PAM8904JER, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PAM8904JER part is unused and in its original packaging.
Return procedure for PAM8904JER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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