ADM660ARZ

Overview

The ADM660ARZ is a CMOS switch-capacitor voltage converter manufactured by Analog Devices Inc., housed in an 8-SOIC surface-mount package. It operates as a charge pump DC-DC switching regulator with a fixed output configuration capable of generating either inverted (-Vin) or doubled (2Vin) voltages from a single input source. The device supports an input voltage range of 1.5V to 7V, delivering a maximum output current of 100mA. It features selectable switching frequencies of 25kHz and 120kHz via the FC pin, allowing optimization between external capacitor size and quiescent current consumption.

Feature Summary

• Provides flexible voltage conversion modes including inversion for negative rail generation and doubling for higher voltage requirements within a single compact component.
• Integrates selectable operating frequencies to allow designers to balance physical footprint constraints against power efficiency and static current draw.
• Utilizes low-power CMOS technology to minimize standby current consumption while maintaining robust drive capability for analog signal conditioning circuits.

Applications

• Generating negative supply rails for operational amplifiers and comparators in single-supply systems
• Creating boosted voltage outputs for applications requiring higher potential than the available input source
• Powering portable instrumentation and data acquisition systems where space and battery life are critical

Procurement Notes

Verify the specific suffix designation when ordering, as packaging variations such as reel configurations may exist for the same base part number. Confirm that the required switching frequency selection matches the design intent regarding external capacitor values. Ensure the procurement channel provides documentation confirming RoHS3 compliance status for environmental regulatory adherence in target markets.

Selection Notes

Select this component when designing circuits that require isolated voltage inversion or boosting without the electromagnetic interference associated with inductive converters. Evaluate the trade-off between the 25kHz and 120kHz frequency options based on available board space for external capacitors versus acceptable quiescent current levels. Ensure the load current does not exceed the 100mA limit to maintain specified regulation performance.

Part Context

This device belongs to the ADM660 family of charge pump voltage converters from Analog Devices. It serves as a direct pin-compatible replacement for legacy components such as the MAX660, MAX665, and ICL7660, facilitating straightforward upgrades in existing designs. The series focuses on providing efficient, low-component-count solutions for basic voltage transformation tasks in industrial and consumer electronics.

Replacement Considerations

The ADM660ARZ is documented as a pin-compatible substitute for the MAX660, MAX665, and ICL7660. Verify pinout compatibility before substitution to ensure seamless integration into existing footprints without circuit modification.

FAQ

How is the switching frequency selected on the ADM660ARZ?

The switching frequency is selected using the FC (Frequency Control) input pin. Connecting this pin appropriately allows the user to choose between 25kHz and 120kHz operation, which influences the required value of the external flying capacitors.

What is the primary advantage of using the ADM660ARZ over inductive DC-DC converters?

The primary advantage is the elimination of inductors, which reduces the overall component count, saves printed circuit board area, and minimizes electromagnetic interference (EMI) issues commonly associated with magnetic components in switching regulators.