Texas Instruments TPS63021DSJT, buck-boost switching regulator, fixed 3.3 V output, 3.5 A switch current, 2.4 MHz switching frequency, 14-VSON (4x3) package, surface-mount, active production.
| Parameter | Value |
|---|---|
| Output type | Fixed |
| Mounting | Surface Mount |
| Voltage - input | 5.5V |
| Voltage - output (Min (Fixed)) | 3.3V |
| Output current | 3.5A (Switch) |
| Frequency - switching | 2.4MHz |
| I/O channels | 1 |
| Operating temperature | -40°C~85°C(TA) |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Function | Step-Up/Step-Down |
| Topology | Buck-Boost |
| Case | 14-VFDFN Exposed Pad |
| Output configuration | Positive |
| Synchronous rectifier | Yes |
The internal switch current limit is 3.5 A, which means the converter can source roughly 2 A continuous at 3.3 V from a 3.7 V Li-ion cell before hitting the limit — enough for a WiFi module plus a small sensor cluster.
The 14-VFDFN exposed pad (4x3 mm) package is a 0.50 mm pitch QFN-style land pattern.
Yes, it is rated ROHS3 Compliant.
The LM53625LQURNLRQ1 is a buck-only (step-down) part with a 2.5 A output and AEC-Q100 automotive qualification — it cannot boost, so it only covers the input-above-output case. The TPS63021DSJT's buck-boost topology is the differentiator: it regulates 3.3 V when the input dips below 3.3 V, which the LM53625 cannot do.