The TPS2140/41/50/51 is a USB 1.0 and 2.0 Specification-compatible IC that contains a dual-current-limiting power switch and an adjustable low dropout regulator (LDO). Both the switch and LDO limit inrush current by controlling the turnon slew rate. The unique dual-current-limiting feature of the switch allows USB peripherals to utilize high-value capacitance at the output of the switch, while keeping the inrush current low. During turnon, the switch limits the current delivered to the capacitive load to less than 100 mA. When the output voltage from the switch reaches a threshold, the switch lowers the current-limiting threshold to allow the load's current requirements to be met before the load's voltage stabilizes.
The TPS2140/41/50/51 family provides a complete power‑management solution for USB high‑power peripherals. Each device integrates a low‑dropout regulator (LDO) and a high‑side power switch with dual current‑limit features, supporting both 2.7 V‑5.5 V input ranges.
The datasheet details pin functions, electrical characteristics, absolute maximum ratings, and recommended operating conditions, along with package options and typical application circuits for USB devices such as modems, cameras, and speakers.
| LDO output voltage range | 0.9 V to 3.3 V |
|---|---|
| Power switch continuous current | 500 mA |
| High‑side MOSFET on‑resistance | 65 mΩ (typ) |
| Input voltage range (SW_IN / LDO_IN) | 2.7 V to 5.5 V |
| Drop‑out voltage (LDO) | 0.5 V (max) |
The power switch can handle up to 500 mA of continuous current.
The LDO output can be set between 0.9 V and 3.3 V.
Typical on‑resistance is 65 mΩ.
The device operates with input voltages from 2.7 V to 5.5 V for both the switch and the LDO.