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Diodes Incorporated PAM8904EGPR-T
- Part No.:
- PAM8904EGPR-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Specialized ICs
- Package:
- 12-UFQFN Exposed Pad
- Datasheet:
-
PAM8904EGPR-T.pdf
- Description:
- IC PIEZO SOUNDER DRVR 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:915
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Product details
Overview
PAM8904EGPR-T 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 differential or single-ended output configurations, features automatic standby/wake-up control, and operates across -40°C to +85°C for battery-powered alarm and security applications.
For engineers reviewing the PAM8904EGPR-T datasheet, PAM8904EGPR-T pinout, PAM8904EGPR-T application, or PAM8904EGPR-T equivalent, key selection criteria include its 3x boost mode timing (tON3 ≈ 1.91ms), shutdown current (≤1µA), thermal/overcurrent/overvoltage protections, and U-QFN2020-12 (Type UX) package compatibility with space-constrained PCB layouts.
Technical Context
The PAM8904EGPR-T implements a fixed-frequency (70–130kHz) switched-capacitor charge pump with selectable 1x/2x/3x gain via EN1/EN2 logic inputs. Its dual-output stage (VO1/VO2) enables differential drive for enhanced acoustic output and reduced EMI in piezoelectric transducers.
Internal protection circuitry includes non-latching short-circuit current limiting (ISC = 49mA), thermal shutdown at TJ = +150°C, and undervoltage lockout - all operating without external components. The device enters low-current shutdown (<1µA) when DIN is held low for >42ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 5.5V - Enables direct Li-ion/Li-poly or triple-AA battery operation without LDO pre-regulation. |
| Boost Output Voltage | Up to 13.5V (3x VIN) - Drives 18VPP piezo sounders from 4.5V supply while staying within 15V absolute max rating. |
| Load Capacitance Support | Up to 47nF - Matches standard ceramic buzzer capacitance without external impedance matching. |
| Input Signal Bandwidth | 20Hz to 300kHz - Supports ultrasonic cleaning signals and audible tone generation (e.g., 3.2kHz alarm tones). |
| Shutdown Current | ≤1µA - Extends battery life in intermittent-alert systems like smoke detectors and medical wearables. |
| Oscillation Frequency | 70–130kHz (typ. 100kHz) - Optimized switching frequency balances efficiency, capacitor size, and EMI performance. |
| Thermal Resistance θJA | 68°C/W (U-QFN2020-12) - Requires minimal copper area for thermal management in compact consumer PCBs. |
Pinout & Package
Package: U-QFN2020-12 (Type UX), 2.0mm × 2.0mm × 0.6mm, wettable flank, NiPdAu terminal finish, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main power input (1.5–5.5V); connects to battery or system rail with local 2.2µF decoupling. |
| 2 | CP2 | Positive terminal of second flying capacitor; forms 3-stage charge pump with CP1/CN1/CN2. |
| 3 | VOUT | Boosted output node (up to 13.5V); supplies high-voltage bias to VO1/VO2 driver stage. |
| 4 | CN1 | Negative terminal of first flying capacitor; critical for charge pump stability and ripple suppression. |
| 5 | GND | Analog/digital ground reference; must be low-impedance plane under package for thermal and noise control. |
| 6 | VO2 | Positive output driver terminal; used with VO1 for differential piezo drive or as single-ended output. |
| 7 | EN1 | Charge pump mode select bit 1; logic input defining 1x/2x/3x gain or shutdown state with EN2. |
| 8 | EN2 | Charge pump mode select bit 2; paired with EN1 to configure operating mode per truth table. |
| 9 | DIN | Digital audio/tone input (20Hz–300kHz); TTL/CMOS-compatible; triggers wake-up and output enable. |
| 10 | CN2 | Negative terminal of second flying capacitor; completes 2-capacitor charge pump topology. |
| 11 | CP1 | Positive terminal of first flying capacitor; primary node for charge transfer in 3x boost cycle. |
| 12 | VO1 | Negative output driver terminal; complements VO2 for true differential drive with zero DC offset. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3x charge pump | Eliminates need for external inductor or high-voltage DC-DC converter; reduces BOM count by ≥4 components. |
| Differential output architecture | Delivers 2× voltage swing across piezo element versus single-ended, increasing sound pressure level (SPL) by ~6dB. |
| Automatic standby/wake-up | Reduces average system current by >99% during idle periods without requiring host MCU intervention. |
| Non-latching short-circuit protection | Self-recovering fault response prevents system lockup during transient piezo overloads or solder shorts. |
| Thermal shutdown with auto-restart | Prevents permanent damage during sustained overload; resumes normal operation once junction cools below +135°C. |
Applications
| Healthcare Alarms | Smart Home Security |
|---|---|
|
Use Scenario: Low-power wearable pulse oximeter with audible alert on SpO₂ drop. IC Role / Device Role / Timing Role: Piezo driver generating 2.5kHz tone burst; activated by MCU GPIO with <1.91ms VOUT ramp-up in 3x mode. Use Value: 1µA shutdown current extends CR2032 battery life to >2 years in standby; differential drive ensures loud, clear tone at low supply voltage. |
Use Scenario: Battery-operated door/window contact sensor with tamper alert. IC Role / Device Role / Timing Role: Sounder driver triggered by reed switch closure; uses 1x mode for fast 470µs turn-on during entry delay. Use Value: 1.5V minimum supply allows operation down to single alkaline cell; small 2×2mm footprint fits inside slim sensor housing. |
| Medical Infusion Pumps | Kitchen Appliance Timers |
|
Use Scenario: IV pump with occlusion and end-of-infusion alerts. IC Role / Device Role / Timing Role: High-reliability piezo driver with thermal/overcurrent protection; operates in 2x mode for balanced efficiency and SPL. Use Value: Built-in OVP/UVP prevents false triggering from rail droop; shutdown mode eliminates audible pop during power cycling. |
Use Scenario: Microwave oven timer with multi-tone countdown feedback. IC Role / Device Role / Timing Role: Tone generator receiving PWM-modulated DIN signal; configured in single-ended mode for cost-sensitive design. Use Value: 300kHz input bandwidth supports complex chirp sequences; no external components needed for boost function saves board space. |
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 DRV8662 | Higher 200VPP output but requires external boost inductor; 2.7–5.5V supply only; no auto-standby. | Better for high-SPL industrial alarms; unsuitable for sub-2V battery operation or ultra-low-power designs. | Select if >18VPP output or higher efficiency at >10mA load is required; accept larger solution size and higher BOM cost. |
| Rohm BU9261KV | Fixed 2x boost only; 2.5–5.5V supply; no differential output; 10µA shutdown current. | Simpler control interface (single EN pin); limited to mid-range voltage gain and lower acoustic output. | Choose for cost-sensitive, low-complexity designs where 13.5VPP is sufficient and 9µA higher shutdown current is acceptable. |
Compared with DRV8662 and BU9261KV, the PAM8904EGPR-T uniquely combines 1.5V operation, 3x programmable boost, differential drive, and sub-1µA shutdown - making it optimal for miniaturized, long-life battery-powered audio alerts.
Availability
PAM8904EGPR-T is available at Aetrix Electronics and suitable for healthcare alarms, smart home security devices, and kitchen appliance timers requiring stable component supply and RoHS-compliant, halogen-free packaging.
Supply support for PAM8904EGPR-T 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, computing, and consumer markets.
The PAM8904E belongs to Diodes' piezo driver product line, engineered specifically for ultra-low-power, high-efficiency audio alert generation in space-constrained, battery-operated systems.
FAQ
What is the maximum piezo capacitance the PAM8904EGPR-T can drive reliably?
The PAM8904EGPR-T is characterized and guaranteed to drive ceramic/piezo sounders up to 47nF, as verified in electrical testing at TA = +25°C with VIN = 3.0V and fDIN = 3.2kHz. Driving larger capacitive loads may reduce output voltage swing, increase tON, or trigger overcurrent protection during startup.
Can the PAM8904EGPR-T operate from a single 1.5V alkaline cell?
Yes - the PAM8904EGPR-T supports 1.5V minimum supply voltage and delivers 18VPP output in 3x mode from 3V, enabling reliable operation across the full discharge curve of one or two alkaline cells. At 1.5V input, it operates in 1x or 2x mode with appropriate EN1/EN2 settings.
How does the differential output configuration improve acoustic performance?
Differential drive applies opposing-phase 13.5VPP signals across the piezo element, doubling effective voltage swing to 27VPP. This increases sound pressure level by ~6dB compared to single-ended drive and eliminates DC bias current, reducing heating and improving long-term reliability of the transducer.
Is the U-QFN2020-12 (Type UX) package compatible with standard reflow profiles?
Yes - the U-QFN2020-12 (Type UX) package has moisture sensitivity level 1 (MSL-1), allowing unlimited floor life and compatibility with standard IPC/JEDEC J-STD-020 reflow profiles. Its NiPdAu terminal finish ensures robust solderability and wetting on OSP- or ENIG-finished PCBs.
PAM8904EGPR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 12-UFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Type:
- Piezo Sounder Driver
- Applications:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- U-QFN2020-12 (Type UX)
- Grade:
- -
- Qualification:
- -
PAM8904EGPR-T FAQ
1.How can I place an order for PAM8904EGPR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM8904EGPR-T 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 PAM8904EGPR-T reliable?
The price and inventory of PAM8904EGPR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM8904EGPR-T is usually 5 days.
3.What payment methods are accepted for PAM8904EGPR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM8904EGPR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM8904EGPR-T?
PAM8904EGPR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM8904EGPR-T 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 PAM8904EGPR-T?
For technical support, including PAM8904EGPR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM8904EGPR-T requirements.
6.How does Aetrix verify that PAM8904EGPR-T is sourced from the original manufacturer or authorized distributors?
All PAM8904EGPR-T 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 PAM8904EGPR-T meets industry standards.
7.What is the process for return or replacement of PAM8904EGPR-T?
All PAM8904EGPR-T units undergo pre-shipment inspection (PSI). If there is an issue with PAM8904EGPR-T, 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 PAM8904EGPR-T part is unused and in its original packaging.
Return procedure for PAM8904EGPR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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