MAX850CSA

Overview

The MAX850CSA is a negative charge-pump voltage regulator manufactured by Analog Devices Inc. under the Maxim Integrated brand. It operates with an input voltage range of 4.5 V to 10 V and provides a fixed -4.1 V output or adjustable output from -0.5 V to -9 V. The device delivers up to 5 mA of output current at a switching frequency of 100 kHz. It features a logic-level shutdown mode with maximum supply current of 3 mA and shutdown current less than 1 µA over temperature. The component is housed in an 8-SOIC package and supports operation within a commercial temperature range of 0°C to +70°C.

Feature Summary

• Provides regulated negative voltage generation using switched-capacitor topology
• Includes logic-level shutdown capability for ultra-low power consumption
• Delivers low output ripple suitable for sensitive analog applications

Applications

• GaAsFET bias supply generation
• Negative rail creation for operational amplifier circuits
• Power management for RS-232 transceivers requiring dual polarity supplies

Procurement Notes

Verify the specific suffix against official datasheets to confirm temperature grade and pinout compatibility. Confirm RoHS compliance status as manufacturing sources may vary. Check for obsolescence notices from Analog Devices prior to finalizing procurement plans due to potential lifecycle changes.

Selection Notes

Select this component when a compact, low-noise negative voltage source is required without inductors. Ensure the load current does not exceed 5 mA. Verify that the input voltage remains within the 4.5 V to 10 V window. Consider thermal dissipation limits if operating near maximum current loads.

Part Context

This part belongs to the MAX850–MAX853 family of negative charge-pump regulators designed for space-constrained designs. These devices eliminate the need for bulky inductors found in traditional DC-DC converters. The MAX850 specifically offers a fixed -4.1 V option alongside adjustable modes, distinguishing it from other variants in the series with different fixed outputs.

Replacement Considerations

Public confirmed substitute part numbers: MAX850ESA+