MAX850ISA

Overview

The MAX850ISA is a low-noise, regulated negative charge-pump power supply manufactured by Analog Devices Inc. under the Maxim Integrated brand. It operates with an input voltage range of 4.5V to 10V and provides a fixed -4.1V output at up to 5mA. The device features a 100kHz switching frequency and achieves typical output ripple of less than 1mVp-p. It includes a logic-level shutdown mode with maximum current consumption of 1µA over temperature. The component is housed in an 8-pin SO package and is rated for operation from 0°C to +70°C.

Feature Summary

• Generates low-noise regulated negative voltage suitable for GaAsFET bias applications
• Features logic-level shutdown mode for significant power reduction
• Provides fixed -4.1V output or adjustable modes depending on variant

Applications

• GaAsFET bias power supplies
• Negative voltage generation for analog circuits
• Low-noise power regulation in portable electronics

Procurement Notes

Verify the specific suffix against the official datasheet to confirm temperature range and output voltage configuration. Ensure the ordering part number matches the required industrial or commercial grade specifications. Confirm RoHS compliance status as per the latest manufacturer documentation before finalizing procurement.

Selection Notes

Select this component when a stable negative rail is required for RF or analog front-end stages. Consider the 100kHz switching frequency for EMI management relative to system clock speeds. Evaluate the 5mA output current limit against the total load requirements of the target circuitry.

Part Context

The MAX850 belongs to the MAX85x family of switched-capacitor regulators designed for generating negative voltages from single positive supplies. These devices are commonly used in communication systems requiring precise biasing for field-effect transistors. The ISA suffix typically denotes the commercial temperature range and SOIC packaging.

Replacement Considerations

Check for MAX851 variants if adjustable output voltage is preferred instead of the fixed -4.1V. Verify pinout compatibility with existing PCB layouts when substituting with other members of the MAX85x series.