TPS62840 With Ultra-Low IQ Not Only Extends Battery Life But Also Stops Switching When EMI-Free Is Needed

TPS62840 is a highly efficient buck converter with ultra-low operating quiescent current of typically 60 nA. It has special circuitry to keep an ultra-low 150 nA IQ in 100% mode operation to further extend battery life near the end of discharge.

TI TPS62840 Buck Converter extends LiMnO2 Battery Power for NB IoT RF Modules

The TPS62840 uses DCS-control™ (Direct Control with Seamless Transition into Power Save Mode) to cleanly power RF devices and operates with a typical switching frequency of 1.8 MHz. In power-save-mode, the device extends the light-load efficiency down to a load current range of equal to or less than 1 µA.

TI DCS-Control Topology Functional Block Diagram
Output voltage wihout DCS-Control vs. Output voltage with DCS-Control (TI TPS62110 vs. TPS62150) by TI’s Kean Pan

These converters offer 16 predefined output voltages that can be selected by connecting a resistor to the VSET-pin, making the devices flexible for various applications with a minimum number of external components. The STOP-pin immediately eliminates switching noise in order to take a noise-free measurement in test and measurement systems.

TI TPS62840 Buck Converter Noise-Free Output of Stop Mode in PFM Operation and Forced PWM Operation

The TPS6284x provides an output current of up to 750 mA. With an input voltage of 1.8 V to 6.5 V, the device supports multiple power sources such as 2S to 4S alkaline, 1S to 2S Li-MnO2, and 1S Li-Ion/Li-SoCl2.

Features

  • 60nA operating quiescent current
  • 100% duty-cycle mode with ultra-low 150nA IQ
  • Wide input voltage range VIN from 1.8V to 6.5V
  • Output current up to 750mA
  • RF friendly DCS-Control™
  • 80% efficiency at 1µA IOUT (3.6 VIN to 1.8 VOUT)
  • 16 selectable output voltages via VSET pin
  • Auto transition PFM/PWM or forced-PWM mode
  • Selectable forced PWM and STOP modes
  • Output discharge function
  • 20nA shutdown current
  • SON-8, WCSP-6 and HVSSOP-8 packages

Applications

  • Smart meters, smart thermostats
  • Tracking devices
  • Wearable electronics
  • Medical sensor patches and patient monitors
  • Industrial IoT (smart sensors)
  • Test and measurement

 

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