The TPS5420DDAR is a high-performance, step‑down (buck) DC‑DC converter Power IC from Texas Instruments, part of the SWIFT™ family of power management devices . It integrates a high‑side N‑channel MOSFET, provides up to 2A of continuous output current (3A peak), and is designed for high‑efficiency power conversion from a 5.5V to 36V input supply . Its fixed 500 kHz switching frequency allows for compact power supply designs using small inductors and capacitors.
The device offers an adjustable output voltage from 1.23V to 31V with ±1.5% initial accuracy, set using two external resistors . Key features include internal compensation (simplifying design), a voltage feed‑forward scheme for improved line regulation, and an enable pin for low‑current shutdown (18 µA typical).
Protection Features
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Overcurrent limiting – Protects against overload and short‑circuit conditions
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Thermal shutdown – Prevents damage at excessive junction temperature
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Undervoltage lockout (UVLO) – Prevents startup below 5.5V
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Internal soft‑start – Limits inrush current
The DDAR suffix indicates tape & reel packaging for automated assembly. The device is available in an 8-pin SOIC PowerPAD™ package with an exposed thermal pad for efficient heat dissipation .
