MAX853ISA

Overview

The MAX853ISA is a low-noise, regulated negative charge-pump power supply manufactured by Analog Devices Inc./Maxim Integrated. It operates with an input voltage range of 4.5V to 10V and provides a fixed -4.1V output or an adjustable output ranging from -0.5V to -9V. The device delivers up to 5mA of output current at a switching frequency of 100kHz. It features a logic-level shutdown mode with maximum shutdown current of 1µA over temperature. The component is housed in an 8-pin SOIC package and is rated for operation within the commercial temperature range of 0°C to +70°C.

Feature Summary

• Achieves typical output ripple of less than 1mVp-p for low-noise applications
• Includes logic-level shutdown mode for significant current reduction
• Provides fixed -4.1V or adjustable -0.5V to -9V output options

Applications

• GaAsFET bias supplies
• Low-noise analog circuit power
• Portable instrumentation

Procurement Notes

Verify RoHS compliance status as datasheets indicate variations between standard and lead-free (+) suffixes. Confirm the specific operating temperature range required, as the ISA variant is limited to 0°C to +70°C compared to industrial grades. Ensure the fixed -4.1V output aligns with design requirements, as other variants offer different fixed voltages or wider adjustment ranges.

Selection Notes

Select this part when low output ripple is critical for sensitive analog loads. The fixed -4.1V output simplifies design for GaAsFET biasing without external resistors. Consider the 0°C to +70°C temperature limit; if wider thermal coverage is needed, evaluate the MAX853C/D or MAX853I variants instead.

Part Context

The MAX853 belongs to a family of negative charge-pump regulators designed for generating stable negative voltages from positive inputs. This series includes variants like the MAX850, MAX851, and MAX852, which differ primarily in output voltage configurations and temperature ratings. The ISA designation specifically denotes the commercial temperature grade and SOIC-8 packaging.

Replacement Considerations

Public confirmed substitute part numbers: MAX853ISA+, MAX853I+.