Texas Instruments LMR62421 Boost/SEPIC Regulator, 2.7-5.5V In, 3-24V Out, 2.1A,

The Texas Instruments LMR62421XMF/NOPB is a high-performance, monolithic step-up voltage regulator from the SIMPLE SWITCHER® family. Designed for both Boost and SEPIC topologies, this compact component integrates all active functions for efficient local DC/DC conversion, offering fast transient response and accurate regulation while minimising PCB footprint. It is engineered to deliver up to 2.1A of output current with exceptional efficiency, making it a cornerstone for power-sensitive designs.

Operating at a high switching frequency of 1.6MHz, this regulator allows for the use of extremely small surface-mount inductors and ceramic capacitors, significantly reducing the size of the external bill of materials. This high frequency, combined with current-mode control and internal compensation, simplifies design, reduces component count, and ensures stable, high-performance operation across a wide range of input voltages and load conditions.

Key to its design for portable applications is an external shutdown feature with an ultra-low standby current of just 80nA, maximising battery life. Additional integrated protection and control features include internal soft-start to limit inrush current, cycle-by-cycle current limiting for robust overload protection, and thermal shutdown to safeguard the IC under fault conditions.

Key Features & Specifications

• Topology: Supports Boost and SEPIC DC-DC regulation.
• Wide Input Range: Accepts input voltages from 2.7V to 5.5V.
• Adjustable Output: Provides a configurable output voltage from 3V up to 24V.
• High Output Current: Capable of delivering up to 2.1A.
• High Efficiency: Achieves efficiencies up to 90%, typically around 83%.
• High Switching Frequency: Fixed at 1.6MHz for minimal external component size.
• Ultra-Low Power Shutdown: Features a shutdown current of only 80nA.
• **Comprehensive Protet