The RT9177 is a 200mA low dropout and low noise micro-power regulator suitable for portable RF applications. The output voltage accuracy within ±2% and range from 2.4V to 3.2V in 100mV increments could be selected. It is designed for using very low ESR output capacitor. Its output remains stable even in using 1µF ceramic as its output capacitor. Using an internal PMOS as the pass device cause that don’t need extra GND current in heavy load and dropout conditions. In shutdown mode, nearly zero operation current cause the IC is suitable for battery-power devices. Other features including current limiting, over temperature protection and adding a capacitor in bypass pin to improve its noise performance are functional.
The RT9177 is a 200 mA low‑dropout, ultra‑low‑noise LDO regulator designed for portable RF applications. It offers selectable output voltages from 2.4 V to 3.2 V in 100 mV steps, low quiescent current, and built‑in shutdown functionality.
The document includes electrical characteristics, absolute maximum ratings, pin configurations, and detailed application notes such as capacitor selection, load‑transient response, and shutdown input operation. Recommended external components and layout guidelines are provided to ensure stability and optimal performance.
| Output Voltage Accuracy | ±2 % |
|---|---|
| Maximum Output Current | 200 mA |
| Low Dropout Voltage | 220 mV @ 200 mA |
| Quiescent Current (No Load) | 80 µA typical |
| Shutdown Current | Near zero |
| Input Voltage Range | 2.5 V – 6 V |
| Noise Density | 150 nV/√Hz |
The RT9177 can deliver up to 200 mA of output current.
In shutdown mode the regulator draws nearly zero current, making it suitable for battery‑powered devices.
The device operates with an input voltage between 2.5 V and 6 V.
A low‑ESR ceramic capacitor of at least 1 pF (commonly 10 nF) placed within 0.5 in of the VOUT pin is recommended.