ADP1621ARMZ-R7

Overview

The ADP1621ARMZ-R7 is a fixed-frequency, pulse-width modulation (PWM), current-mode step-up converter controller manufactured by Analog Devices Inc. It operates within an IC supply voltage range of 2.9 V to 5.5 V and supports power-input voltages as low as 1.0 V. The device achieves up to 92% efficiency without requiring a current-sense resistor for switch-node voltages below 30 V. It features programmable operating frequencies from 100 kHz to 1.5 MHz, ±1.0% initial accuracy, and a shutdown current of 10 μA. The component is housed in a 10-lead Mini Small Outline Package [MSOP] and functions across a temperature range of -40°C to +125°C.

Feature Summary

• Eliminates the need for a current-sense power resistor by measuring the voltage drop across the on-resistance of the external n-channel MOSFET for switch-node voltages up to 30 V.
• Supports multiple converter topologies including flyback, SEPIC, and forward converters, either isolated or nonisolated.
• Provides lossless current sensing for lower switch-node voltages while allowing connection to a current-sense resistor for higher voltages or enhanced accuracy.
• Integrates soft start functionality over 2048 clock cycles along with current limit and thermal overload protection.

Applications

• APD bias
• Portable electronic equipment
• Isolated dc/dc converter
• LED driver for laptop computer and navigation system
• LCD backlighting

Procurement Notes

Verify the specific ordering suffix and package variant against the manufacturer's official documentation to ensure compatibility with your design requirements. Confirm that the component meets all necessary regulatory standards for your target market. Check for any recent product change notifications or lifecycle status updates directly from Analog Devices. Ensure that the selected part number matches the exact electrical specifications required for your application circuit.

Selection Notes

Select this controller when designing boost, flyback, SEPIC, or forward converters requiring high efficiency without external current-sense resistors at lower switch-node voltages. Consider its capability to drive external n-channel MOSFETs and its support for frequencies up to 1.5 MHz. Evaluate its suitability for applications needing precise current-mode control and robust protection features like thermal overload and current limiting.

Part Context

The ADP1621ARMZ-R7 belongs to the ADP1621 family of switching controllers from Analog Devices. This series is designed for efficient power conversion in portable and industrial applications. The ARMZ suffix indicates a RoHS-compliant part in an MSOP package. The R7 suffix typically denotes reel packaging. This component integrates advanced control techniques to maximize performance while minimizing external component count.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult Analog Devices for potential alternatives if this specific part number is unavailable or discontinued. Verify pinout and electrical parameter compatibility before considering any cross-reference components.