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NJW1280 Series
High Capacitance Piezo-sounder Driver with charge pump

Download Datasheet

  • Description

    NJW1280 is a driver for large-capacity piezo-sounder. With the built-in charge pump circuit and differential output, it is enabling to output 30Vpp with 5V single power supply, and can be configure a large-capacity 30nF piezo-sounder with four external capacitors. The operating voltage of NJW1280 is 2.0V to 5.5V, and it can be used with coin type batteries or Li-ion batteries. When not operating (no signal), the built-in input signal detection circuit automatically switches to the shutdown mode (0.5 µA max. at VDD=3V) to reduce battery consumption and realize a long service life of the set. The NJW1280 is available in a leaded MSOP10 package and a 2.3mm x 2.3mm size 0.397mm thick leadless DFN8-G2 package, which can be used for ultra-small wearable devices.


    • Security Alarm
    • Fire Alarm
    • Smoke Detector

  • Spec
    Supply Voltage 2V to 5.5V
    Channel BTL 1ch.
    Input Signal PWM/PDM
    Output Voltage / Vom Typ. 30Vpp
    Output Voltage / V+ 5V
    Output Voltage / CL 30nF
    Stand-by Yes
    Operating Current - Active: (FIN = 4kHz, CPIEZO = 30nF) 3.5mA typ.- Shutdown 0.5µA max.)
    Wide Operating Temperature -40°C to 105°C
    Junction Temp. 150°C
    Package EQFN16-G2,MSOP10(TVSP10)
    Features Built in Charge Pump
    30Vpp Differential Output
    Note 1 Internal 3 times Charge pump Circuit
    Note 2 Piezo-Sounder Drive Capacity (30nF typ.)

    Protections / Functions

    Stand-by Mute Fine Tune Sensitivity
  • Technical
  • Quality &
    • Refer to the datasheets for the details on the product.
    • The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

Download Datasheet

Functional Description

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Category:Audio Amplifiers

Sub Ctegory Class D Amp.
Channel(ch) 1
Supply Voltage
Supply Voltage
Output Voltage vom(Vrms) 30Vpp