High Capacitance Piezo-sounder Driver with charge pump

Data Sheet


  • Output Voltage (VDD = 5V, Differential) (30VPP typ.)
  • Piezo-Sounder Drive Capacity (30nF typ.)
  • Internal 3 times Charge pump Circuit
  • Operating Voltage (2.0 to 5.5V)
  • Operating Current (
    - Active: (FIN = 4kHz, CPIEZO = 30nF) 3.5mA typ.
    - Shutdown 0.5µA max.)
  • Input Signal Detection Circuit (Auto Shutdown)
  • Operating Temperature (-40°C to 105°C)
  • Thermal Shutdown Circuit
  • Current Limit Circuit
  • Low-PVDD Detection Circuit
  • Package Outline (EQFN16-G2,MSOP10 (TVSP10))

General 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

Package Information

Part NumberPackage OutlinePLPPinsMaterial Declaration (RoHS/Halogen)Terminal FinishWeight(mg) (Reference)Reflow solderingFlow solderingIron solderingPacking ConditionMSLSolder Foot Print
NJW1280MG2EQFN16-G2-16-Sn2Bi6.5Yes--Non dry pack1
NJW1280RB2MSOP10(TVSP10)-10-Sn2Bi19YesYesYesNon dry pack1

Sample & Buy

Part NumberPackagesStatusPacking SpecificationSampleBuy
NJW1280MG2EQFN16-G2(Active)Contact UsSales Support
NJW1280RB2MSOP10(TVSP10)(Active)Contact UsSales Support

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