LTC3260 Low Noise Dual Supply Inverting Charge Pump FEATURES
VIN Range: 4.5V to 32V n Inverting Charge Pump Generates...
LTC3260 Low Noise Dual Supply Inverting Charge Pump FEATURES
VIN Range: 4.5V to 32V n Inverting Charge Pump Generates –V IN n Charge Pump Output Current Up to 100mA n Low Noise Negative LDO Post
Regulator (ILDO– = 50mA Max) n Low Noise Independent Positive LDO
Regulator (ILDO+ = 50mA Max) n 100µA Quiescent Current in Burst Mode® Operation with Both LDO
Regulators On n 50kHz to 500kHz Programmable Oscillator Frequency n Stable with Ceramic Capacitors n Short-Circuit/Thermal Protection n Low Profile 3mm × 4mm 14-Pin DFN and Thermally Enhanced 16-Pin MSOP Packages
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DESCRIPTION
The LTC®3260 is a low noise dual polarity output power supply that includes an inverting charge pump with both positive and negative LDO
regulators. The charge pump operates over a wide 4.5V to 32V input range and can deliver up to 100mA of output current. Each LDO
regulator can provide up to 50mA of output current. The negative LDO post
regulator is powered from the charge pump output. The LDO output voltages can be adjusted using external resistor dividers. The charge pump employs either low quiescent current Burst Mode operation or low noise constant frequency mode. In Burst Mode operation the charge pump VOUT regulates to –0.94 VIN, and the LTC3260 draws only 100µA of quiescent current with both LDO
regulators on. In constant frequency mode the charge pump produces an output equal to –VIN and operates at a fixed 500kHz or to a programmed value between 50kHz to 500kHz using an external r...