NJU72501MG2-TE1

Overview

The NJU72501MG2-TE1 is a Class-D switching driver with a multi-mode charge pump designed for piezo-sounders. It operates from a 2.3V to 5.0V supply and drives outputs up to 18Vpp. The device features 1x, 2x, or 3x step-up modes controlled by EN1 and EN2 pins. Active consumption current is typically 0.3mA at 3V input in 1x mode, while shutdown current is 1µA maximum. It includes an input signal detector, short-circuit protection, and is housed in an EQFN16-G2 package.

Feature Summary

• Multi-mode charge pump allows adjustable output voltage via 1x, 2x, or 3x step-up configurations.
• Integrated input signal detector enables automatic shutdown control when no audio signal is present.
• Built-in output short-circuit protection circuit safeguards the driver during fault conditions.

Applications

• Healthcare devices
• Wrist watches
• Alarm clocks
• Handheld GPS devices
• PDAs

Procurement Notes

Verify that the specific suffix MG2 corresponds to the EQFN16-G2 package outline as defined in the official datasheet. Confirm the operating voltage range matches the application requirements, noting the 3.4V maximum limit for 3x mode operation. Ensure compatibility with the required piezo-sounder capacitance and drive frequency specifications before finalizing procurement.

Selection Notes

Select this component for battery-powered applications requiring low active and shutdown currents. The choice of EQFN16-G2 package suits surface-mount designs needing compact footprints. Consider the 3x mode voltage limit if higher drive voltages are necessary, as it restricts the input supply to 3.4V maximum. Verify thermal dissipation capabilities on the target PCB layout against the specified power ratings.

Part Context

The NJU72501 series comprises switching drivers for piezo-sounders available in multiple packages including EQFN12-JE, EQFN16-G2, and SSOP14. The MG2 variant specifically utilizes the EQFN16-G2 package. This family is designed for portable electronics where space and power efficiency are critical constraints.

Replacement Considerations

The datasheet identifies MAS6240 as a direct replacement part number for the NJU72501 series.

FAQ

How is the charge pump mode selected?

The mode is determined by the logic levels on the EN1 and EN2 terminals: 1x mode uses EN1=Low/EN2=High, 2x mode uses EN1=High/EN2=Low, and 3x mode uses EN1=High/EN2=High.

What is the maximum input voltage for 3x mode operation?

The maximum operating voltage for 3x mode is 3.4V. For 1x and 2x modes, the maximum supply voltage is 5.0V.