ADP3810AR-4.2

Overview

The ADP3810AR-4.2 is a synchronous step-down switching regulator manufactured by Analog Devices Inc., designed for high-efficiency power conversion in portable and battery-powered applications. This component integrates a 4.2V output voltage regulator with an internal power switch, operating from an input voltage range of 2.7V to 5.5V. It features a fixed switching frequency of 1MHz, enabling the use of small external passive components. The device includes comprehensive protection mechanisms such as over-current protection, thermal shutdown, and undervoltage lockout. Packaged in a compact 10-lead TSSOP format, it supports continuous output currents up to 1A, making it suitable for powering digital signal processors, microcontrollers, and memory devices in space-constrained designs.

Feature Summary

• Integrates a 1MHz fixed-frequency PWM controller with an internal N-channel power switch for simplified design
• Provides precise 4.2V regulated output with low dropout characteristics for efficient battery operation
• Includes built-in over-current protection, thermal shutdown, and undervoltage lockout for system reliability
• Supports low standby current consumption to extend battery life in portable electronic devices

Applications

• Powering mobile phones and handheld communication devices
• Supplying voltage rails for personal digital assistants (PDAs) and smartphones
• Power management for Bluetooth modules and wireless sensors
• Battery-operated consumer electronics requiring compact form factors

Procurement Notes

Verify the exact suffix 'AR-4.2' against official Analog Devices documentation to confirm the fixed 4.2V output variant, as other suffixes may indicate adjustable outputs or different packages. Ensure compliance with RoHS standards if required by your manufacturing process. Check for moisture sensitivity level (MSL) ratings prior to surface-mount assembly to prevent damage during reflow soldering. Confirm that the 10-lead TSSOP package dimensions match your PCB footprint requirements. Validate that the input voltage range of 2.7V to 5.5V aligns with your system's power source specifications.

Selection Notes

Select this component when a fixed 4.2V output is required for low-voltage digital circuits. Consider its 1A current capability and 1MHz switching frequency for balancing efficiency and component size. Evaluate the need for integrated protection features versus external solutions. Compare power dissipation limits in the TSSOP package against your thermal design constraints. Assess compatibility with single-cell lithium-ion or lithium-polymer battery systems due to the wide input voltage range.

Part Context

The ADP3810 series belongs to Analog Devices' portfolio of synchronous buck converters optimized for portable applications. Unlike general-purpose regulators, this part integrates the control logic and power stage into a single chip, reducing board space. The specific '-4.2' designation indicates a factory-set output voltage, distinguishing it from adjustable variants within the same family. It complements other PMIC solutions by offering a simple, cost-effective step-down solution for mid-range current demands.

Replacement Considerations

Check Analog Devices datasheets for cross-reference candidates like the ADP3810ARZ-REEL7 for reel packaging alternatives. Verify pin-to-pin compatibility with other 10-lead TSSOP synchronous buck converters from different manufacturers if supply chain diversification is needed. Ensure equivalent electrical parameters such as switching frequency, current limit, and thermal performance before substitution.