TK717xxS is a low dropout linear regulator with a built-in electronic switch that can be controlled by TTL or CMOS logic levels. When the control pin is pulled to a logic high level, the device is in the ON state. In the OFF state, the output impedance becomes very low, quickly discharging the output capacitor. An external capacitor can be connected to the noise bypass pin to lower the output noise level to 30 ~ 50 μVrms. An internal PNP pass transistor is used to connect the input and output voltages.
The TK717xxS is a low‑dropout linear regulator offered in a compact SOT23‑5 surface‑mount package. It provides a wide operating voltage range of 1.8 V to 14 V, very low dropout voltage, and built‑in protection features such as short‑circuit and thermal shutdown.
The datasheet includes absolute maximum ratings, electrical characteristics, typical performance graphs, and detailed package dimensions. Ordering information and application notes for automatic discharge operation are also provided.
| Operating Voltage Range | 1.8 V – 14 V |
|---|---|
| Dropout Voltage (100 mA) | 103 mV |
| Quiescent Current (no load) | 72 µA |
| Standby Current | ≈100 pA |
| Maximum Output Current | 370 mA (0.3 V drop) |
| Ripple Rejection Ratio | 80 dB at 1 kHz |
| Output Noise | 0.20 µV/V·Hz typical at 1 kHz |
| Power Dissipation (free air) | 150 mW |
| Power Dissipation (mounted) | 500 mW |
| Package Type | SOT23‑5 surface‑mount |
The dropout voltage is 103 mV at a 100 mA load.
The quiescent current is 72 µA with no load.
It can deliver up to 370 mA before the output drops by 0.3 V.