The TS39301/2/3/4 are 3A ultra low dropout linear voltage regulators that provide low voltage, high current output with a minimum of external components. The TS39301/2/3/4 offers extremely low dropout (typically 400mV at 3A) and low quiescent current (typically 36mA at 3A). The TS39301/2/3/4 is ideal for PC add-in cards that need to convert from standard 3.3V to 2.5V or 2.5V to 1.8V. A guaranteed maximum dropout voltage of 500mV over all operating conditions allows the TS39301/2/3/4 to provide 2.5V from a supply as low as 3V, and 1.8V from a supply as low as 2.5V. The TS39301/2/3/4 also has fast transient response for heavy switching applications. The device requires only 47uF of output capacitor to maintain stability and achieve fast transient response.
The TS39301/2/3/4 family provides ultra‑low dropout regulation (typical 0.4 V at 3 A) and low quiescent current (≈36 mA at full load). It is offered in 5‑pin TO‑220 and TO‑263 packages and supports output voltages from 1.8 V to 5 V with minimal external components.
The device includes features such as current limiting, thermal shutdown, reverse‑battery protection, and an optional error‑flag output. Recommended external components are a 47 µF output capacitor (ESR < 10 Ω) and a 1 µF input capacitor for stability and transient performance.
| Dropout Voltage (typical) | 0.4 V @ 3 A |
|---|---|
| Maximum Output Current | 3 A |
| Quiescent Current | 36 mA typical at 3 A |
| Output Voltage Tolerance | 0.990–1.010 V at 10 mA load |
| Operating Temperature Range | -40 °C to +125 °C |
The typical dropout voltage is about 0.4 V when delivering 3 A.
A 47 µF output capacitor (or larger) with an ESR less than 10 Ω is recommended for stability.
The regulator can supply up to 3 A of output current.