28V dual channel tracking bipolar power management chip LTC3260 application circuit with ±5V to ±25V output

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description:

The LTC3260 is a low noise, bipolar output supply that includes a negative output charge pump with both positive and negative LDO regulators. The charge pump operates from a wide input range of 4.5V to 32V and is capable of delivering up to 100mA of output current. Each LDO regulator can deliver up to 50mA of output current. The negative LDO post regulator uses the charge pump output to power. The LDO output voltage can be adjusted using an external resistor divider.

Characteristics

• VIN range: 4.5V or 32V
• Negative output charge pump produces -VIN
• Charge pump output current up to 100mA
• Low Noise Negative LDO Post Regulator (ILDO– = 50mA Max)
• Low Noise Independent Positive LDO Regulator (ILDO+ = 50mA Max)
• 100μA quiescent current in Burst Mode? operation (both LDO regulators are on)
• 50kHz to 500kHz programmable oscillator frequency
• Stable when using ceramic capacitors
• Short circuit / thermal protection
• Flat 3mm x 4mm 14-Pin DFN Package and Thermally Enhanced 16-Lead MSOP Package

application

• Low noise bipolar / negative output power supply
• Industrial / Instrumentation Low Noise Bias Generator
• Portable medical device
• Portable instrument
  

LTC3260 Typical Application Circuit