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.
Features
- 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
Applications
- Low noise bipolar/inverting supplies
- Industrial/instrumentation low noise bias generators
- Portable medical equipment
- Portable instruments
LTC3260 Typical Application
Related Products
Analog Devices Inc. LTC32xx Inductorless Charge Pump DC/DC Converters
Inductorless charge pump DC/DC converters operating over a wide 2.7V up to 48V input voltage range.
Published: 2017-05-04
| Updated: 2022-03-24