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Product Detailed Parameters
- Description：IC AMP D MONO 1.9W U-WLB1520-12
- Series：-
- Mfr：Diodes Incorporated
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：Class D
- Output Type：1-Channel (Mono)
- Max Output Power x Channels @ Load：1.9W x 1 @ 8Ohm
- Voltage - Supply：2.8V ~ 5.2V
- Features：Short-Circuit and Thermal Protection
- Mounting Type：Surface Mount
- Supplier Device Package：U-WLB1520-12
- Package / Case：12-UFBGA, WLBGA
- Operating Temperature：-40°C ~ 85°C (TA)
- Grade：-
- Qualification：-
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Overview
The PAM8905PZR is a Class-D audio power amplifier manufactured by Diodes Incorporated, housed in a U-WLB1520-12 package. It operates on a supply voltage ranging from 2.8V to 5.2V and delivers up to 1.9W of output power into an 8Ω load at 3.6V with 1% THD+N. The device features an integrated boost converter that achieves over 85% typical efficiency. Key electrical parameters include a quiescent current of 4mA, a shutdown current of 1μA, and a switching frequency of 1200kHz for the boost converter.
Feature Summary
- Integrated boost converter generates a higher voltage rail to drive speakers louder than direct battery connection while maintaining consistent loudness across varying battery levels.
- Battery tracking automatic gain control (AGC) dynamically adjusts amplifier gain to limit battery current draw during low voltage conditions.
- Includes comprehensive protection mechanisms such as DC input protection, auto-recovery short-circuit protection, and thermal shutdown.
- Designed to minimize pop noise during ON/OFF transitions and offers superior low noise performance with high power supply ripple rejection.
Applications
- Cell Phones
- Portable Electronics
- GPS Devices
Procurement Notes
Verify the component status before procurement, as the datasheet explicitly states this part is not recommended for new designs. Confirm the specific U-WLB1520-12 package type and tape & reel shipping configuration. Ensure compatibility with existing circuit layouts due to the presence of an integrated boost converter requiring external passive components.
Selection Notes
Select this component for applications requiring high efficiency and extended battery life in portable devices. The integrated boost converter allows for higher output power compared to standard single-supply amplifiers. Consider the AGC feature if maintaining consistent volume during battery discharge is critical. Evaluate the compact U-WLB1520-12 package size against available PCB space constraints.
Part Context
The PAM8905 belongs to Diodes Incorporated's portfolio of Class-D audio amplifiers designed for mobile and portable electronics. It integrates power management functions directly onto the chip to reduce external component count. The device is engineered to provide high-fidelity audio output while maximizing energy efficiency through its advanced switching architecture and boost capabilities.
Replacement Considerations
The datasheet recommends using the PAM8945 as a replacement for new designs.
FAQ
How does the AGC function operate?
The Battery Tracking AGC adjusts the Class-D gain to limit battery current when the supply voltage drops, ensuring consistent audio performance without draining the battery excessively.
What is the purpose of the integrated boost converter?
The boost converter generates a voltage rail higher than the input supply, allowing the amplifier to drive speakers with greater output power and maintain loudness regardless of battery voltage levels.
