Analog Devices Inc. LTC3260 Inverting Charge Pump Converters

Analog Devices Inc. LTC3260 Dual-Supply Inverting Charge Pump Converters are low-noise, DC/DC converters with dual polarity output power supplies. The LTC3260 features both positive and negative low dropout (LDO) regulators that can source up to a 50mA output current each. This design allows the LTC3260 to deliver up to 100mA output over a 4.5V to 32V input voltage range. Designers can use the external resistor dividers to adjust the positive and negative LDO output voltages down to 1.2V and -1.2V, respectively.

The internal charge pump works in either low-quiescent current Burst Mode® operation or low-noise constant frequency mode. When in Burst Mode operation, the charge pump regulates to -0.94 VIN and consumes only 100μA of quiescent current with both LDO regulators enabled. When in constant frequency mode, the charge pump generates an output equal to -VIN. In constant frequency mode, the LTC3260 from Analog Devices uses an external resistor to operate at a fixed 500kHz frequency or to a programmed value between 50kHz to 500kHz.


  • 4.5V to 32V VIN range
  • Inverting charge pump generates –VIN
  • Up to 100mA charge pump output current
  • Low noise negative LDO post regulator (ILDO = 50mA max)
  • Low noise independent positive LDO regulator (ILDO = 50mA max)
  • 50kHz to 500kHz programmable oscillator frequency
  • 100μA quiescent current in Burst Mode operation with both LDO regulators on
  • Stable with ceramic capacitors
  • Short-circuit/thermal protection
  • Low profile 3mm × 4mm 14-pin DFN and thermally enhanced 16-pin MSOP packages


  • Low noise bipolar/inverting supplies
  • Industrial/instrumentation low noise bias generators
  • Portable medical equipment
  • Portable instruments

LTC3260 Typical Application

Application Circuit Diagram - Analog Devices Inc. LTC3260 Inverting Charge Pump Converters
Published: 2017-05-04 | Updated: 2022-03-24