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Diodes Incorporated PAM8904EJPR
- Part No.:
- PAM8904EJPR
- Manufacturer:
- Diodes Incorporated
- Category:
- Specialized ICs
- Package:
- 12-UFQFN Exposed Pad
- Datasheet:
-
PAM8904EJPR.pdf
- Description:
- IC PIEZO SOUNDER DRVR 12UQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,289
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Product details
Overview
PAM8904EJPR from Diodes Incorporated is a piezo sounder driver IC with integrated 3x charge pump boost converter, delivering up to 13.5V output from 1.5–5.5V supply and driving ceramic/piezo loads up to 47nF. It supports 1x/2x/3x mode selection via EN1/EN2 pins, achieves 18VPP output at 3V supply, and features automatic standby/wake-up for battery-sensitive applications such as alarm clocks and security devices.
For engineers reviewing the PAM8904EJPR datasheet, PAM8904EJPR pinout, PAM8904EJPR application, or PAM8904EJPR equivalent, key selection criteria include charge pump mode flexibility, differential/single-ended output configuration, thermal/overcurrent protection, shutdown current <1µA, and compatibility with U-QFN3030-12 (Type A) package layout.
Technical Context
The PAM8904EJPR implements a fixed-frequency (70–130kHz) switched-capacitor charge pump with selectable 1x/2x/3x gain, enabling VOUT generation up to 13.5V while maintaining low EMI and minimal external components. Its dual-output architecture (VO1/VO2) supports both differential and single-ended piezo drive configurations.
Control logic interprets DIN signal edges to initiate tON delays (470µs–1.91ms depending on mode), then enables VO1/VO2 after VOUT stabilization. Built-in short-circuit protection limits output current to 49mA without latching, and thermal shutdown activates at TJ = +150°C with automatic recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 5.5V - Enables direct operation from single Li-ion, alkaline, or coin-cell sources without LDO pre-regulation. |
| Output Voltage (3x Mode) | 7.2–9.0V (VIN = 3.0V) - Delivers sufficient voltage swing for high-SPL piezo sounders requiring >12VPP drive. |
| Max Piezo Load | 47nF - Matches typical ceramic buzzer capacitance, eliminating need for external impedance matching. |
| Shutdown Current | 0.008–1µA - Extends battery life in intermittent-audio applications like smoke alarms and medical alerts. |
| Charge Pump Frequency | 70–130kHz - Optimized for small ceramic capacitors (1µF CP1/CP2), minimizing board area and cost. |
| DIN Input Frequency Range | 20Hz to 300kHz - Supports tone generation, PWM-driven melodies, and ultrasonic signaling without external oscillator. |
| Thermal Shutdown Threshold | +150°C junction temperature - Protects against sustained overdrive or poor PCB thermal design in compact enclosures. |
Pinout & Package
Package: U-QFN3030-12 (Type A), 3.0mm × 3.0mm × 0.6mm, 12-pin, exposed thermal pad, RoHS-compliant NiPdAu terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN1 | Charge pump mode select input | Configures 1x/2x/3x/Shutdown when paired with EN2; logic-high threshold is 0.5×VIN for rail-to-rail compatibility. |
| 2 EN2 | Charge pump mode select input | Second control bit for full mode selection; both EN1/EN2 low forces ultra-low-power shutdown (<1µA). |
| 3 DIN | Audio input signal | Accepts TTL/CMOS-level rectangular pulses (20Hz–300kHz); no external biasing required. |
| 4 NC | No connection | Internally unconnected; must be left floating or tied to GND per layout guidelines to avoid noise coupling. |
| 5 CN1 | Charge pump capacitor negative terminal | Connects to negative side of 1µF flying capacitor; critical for stable 2x/3x voltage doubling/tripling. |
| 6 GND | Power and signal ground | Primary return path for charge pump, output drivers, and logic; requires low-impedance connection to thermal pad. |
| 7 VO2 | Positive output terminal | Drives one side of piezo element in differential mode or serves as high-side output in single-ended configuration. |
| 8 NC | No connection | Internally unconnected; must not be soldered to trace or plane to prevent parasitic coupling. |
| 9 VO1 | Negative output terminal | Drives opposite side of piezo in differential mode; inverted relative to VO2 for maximum voltage swing across load. |
| 10 CN2 | Charge pump capacitor negative terminal | Second flying capacitor node; used only in 3x mode with CP1/CP2 to enable triple-voltage conversion. |
| 11 CP1 | Charge pump capacitor positive terminal | Connects to positive side of first 1µF flying capacitor; forms core of 1x/2x charge pump stage. |
| 12 VIN | Power supply input | Accepts 1.5–5.5V input; internal UVLO disables operation below ~1.3V to prevent erratic behavior during brownout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3x charge pump | Generates up to 13.5V from 3V supply using only two 1µF ceramic capacitors-eliminates inductor-based boosters and reduces EMI. |
| Differential + single-ended output support | Configurable VO1/VO2 drive enables either 2× voltage swing across piezo (differential) or simplified single-rail interface (single-ended). |
| Automatic standby/wake-up | Enters <1µA shutdown 42ms after DIN signal removal; resumes within 470µs–1.91ms upon next valid edge-ideal for battery-powered alerts. |
| Comprehensive protection suite | Includes thermal shutdown (+150°C), overcurrent limiting (49mA), overvoltage clamp (15V), and undervoltage lockout-no external supervision needed. |
| U-QFN3030-12 (Type A) footprint | 3.0×3.0mm body with 0.5mm pitch and exposed thermal pad enables high-density placement in space-constrained consumer and medical devices. |
Applications
| Alarm Clocks | Security Devices |
|---|---|
|
Use Scenario: Generating audible alert tones at scheduled intervals with minimal power draw between activations. IC Role / Device Role / Timing Role: Piezo driver providing regulated 18VPP output from 3V coin cell, triggered by RTC interrupt signal on DIN. Use Value: 0.008µA shutdown current extends 2032 battery life beyond 2 years; fast 470µs wake-up ensures prompt tone initiation. |
Use Scenario: Producing loud, attention-grabbing siren patterns during intrusion detection or fire alarm activation. IC Role / Device Role / Timing Role: High-voltage piezo driver delivering 13.5V output in 3x mode to maximize SPL from 47nF ceramic transducer. Use Value: Differential VO1/VO2 output doubles effective voltage swing across piezo, increasing acoustic output by 6dB versus single-ended drive. |
| Health Care Systems | Home Appliances |
|
Use Scenario: Providing tactile feedback and audible alerts in portable blood glucose meters and pulse oximeters. IC Role / Device Role / Timing Role: Low-noise piezo driver with automatic standby, activated by microcontroller GPIO on DIN to signal measurement completion. Use Value: Integrated short-circuit protection prevents damage during accidental probe contact; thermal shutdown avoids overheating in sealed plastic housings. |
Use Scenario: Driving piezo beepers in washing machines, microwaves, and coffee makers for user interface feedback. IC Role / Device Role / Timing Role: Robust piezo driver operating from 5V system rail, supporting variable-tone generation via PWM-modulated DIN input. Use Value: Wide 20Hz–300kHz input range allows precise frequency control for distinct error vs. confirmation tones without external DAC or oscillator. |
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 DRV2667 | Integrated haptic waveform generator + piezo driver; requires I²C configuration; no built-in charge pump (needs external 12V supply). | Targeted at complex haptic feedback (vibration profiles), not simple audio alerts. | Select only if programmable waveforms and closed-loop resonance tracking are required; adds firmware overhead and BOM cost. |
| Rohm BU9261KV | Fixed 2x charge pump only; max output 10V; no 3x mode or differential output; smaller 2.0×2.0mm W-QFN package. | Limited to lower-voltage piezos (<12VPP); lacks automatic wake-up and has higher shutdown current (5µA). | Choose for ultra-compact designs where 18VPP drive and sub-1µA shutdown are not mandatory. |
Compared with DRV2667 and BU9261KV, the PAM8904EJPR uniquely combines 3x boost, differential drive, <1µA shutdown, and U-QFN3030-12 packaging-making it optimal for cost-sensitive, battery-powered audio alert systems needing maximum piezo voltage swing and minimal quiescent power.
Availability
PAM8904EJPR is available at Aetrix Electronics and suitable for alarm clocks, security devices, health care systems, and home appliances requiring stable component supply with long-term manufacturability assurance.
Supply support for PAM8904EJPR 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The PAM8904E belongs to Diodes' piezo driver product line, engineered specifically for low-power, high-voltage audio alert generation in battery-operated consumer and medical devices-emphasizing integration, efficiency, and protection robustness.
FAQ
What is the maximum recommended piezo capacitance for PAM8904EJPR?
The PAM8904EJPR is characterized and guaranteed to drive loads up to 47nF, as confirmed in the Electrical Characteristics table (CPIEZO = 47nF test condition). Exceeding this value may degrade tON response time, reduce peak output voltage, or trigger overcurrent protection during startup. For larger loads, consider adding series resistance or selecting a driver with higher current capability.
Can PAM8904EJPR operate from a 1.5V alkaline battery?
Yes-the PAM8904EJPR supports 1.5V minimum supply voltage and maintains functionality down to this level, including 1x mode operation. At 1.5V, VOUT1 is specified at 2.8–3.0V, sufficient to drive low-threshold piezos. However, 2x/3x modes require ≥2.7V input to meet output voltage specifications and avoid violating absolute maximum ratings.
How does the automatic wake-up function respond to noisy DIN signals?
The PAM8904EJPR incorporates input filtering that requires a valid DIN signal edge to persist for at least one oscillation cycle (~10µs at 100kHz) before initiating wake-up. Glitches shorter than this duration are rejected, preventing false triggering. The 42ms tOFF delay further ensures stable shutdown after transient noise subsides.
Is thermal pad soldering required for PAM8904EJPR in U-QFN3030-12 (Type A) package?
Yes-thermal performance data (θJA = 35°C/W) assumes the exposed thermal pad is soldered to a minimum 100mm² copper pour with ≥4 thermal vias. Omitting pad connection increases junction temperature by >40°C under full load, risking premature thermal shutdown and reduced reliability. Solder mask defined pads and stencil aperture design must follow Diodes' recommended layout in DS41667 Rev. 4–2 page 9.
PAM8904EJPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 12-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- Not Verified
- Type:
- Piezo Sounder Driver
- Applications:
- Health, Home, Security
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-QFN3030-12 (Type A)
- Grade:
- -
- Qualification:
- -
PAM8904EJPR FAQ
1.How can I place an order for PAM8904EJPR through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM8904EJPR 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 PAM8904EJPR reliable?
The price and inventory of PAM8904EJPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM8904EJPR is usually 5 days.
3.What payment methods are accepted for PAM8904EJPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM8904EJPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM8904EJPR?
PAM8904EJPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM8904EJPR 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 PAM8904EJPR?
For technical support, including PAM8904EJPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM8904EJPR requirements.
6.How does Aetrix verify that PAM8904EJPR is sourced from the original manufacturer or authorized distributors?
All PAM8904EJPR 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 PAM8904EJPR meets industry standards.
7.What is the process for return or replacement of PAM8904EJPR?
All PAM8904EJPR units undergo pre-shipment inspection (PSI). If there is an issue with PAM8904EJPR, 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 PAM8904EJPR part is unused and in its original packaging.
Return procedure for PAM8904EJPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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