The Advanced AMS4155 is a monolithic step down switch mode converter with a built-in internal power switch transistor. It achieves 2A continuous output current over a wide input supply range with excellent load and line regulation.
The AMS4155 is a monolithic step‑down switch‑mode converter that delivers 2 A continuous output current over a wide 4.75 V‑20 V input range. It features a fixed 480 kHz switching frequency, thermal shutdown, cycle‑by‑cycle over‑current protection, under‑voltage lockout and frequency‑synchronization input. The device is supplied in an 8‑pin SOIC package and operates from –40 °C to 125 °C.
The datasheet provides pin descriptions, absolute maximum ratings, electrical characteristics, typical performance curves and package dimensions, along with recommended PCB layout guidelines for optimal operation.
| Continuous Output Current | 2 A |
|---|---|
| Input Voltage Range | 4.75 V to 20 V |
| Switching Frequency | 480 kHz (fixed) |
| Efficiency | Up to 95 % |
| Operating Temperature | -40 °C to 125 °C |
| Package Type | 8‑Pin SOIC |
| Shutdown Supply Current | 171 A (as specified) |
| Oscillator Frequency Range | 420 kHz – 500 kHz |
| Enable Threshold | 2.2 V – 2.55 V |
| Under‑Voltage Lockout Threshold | 2.4 V – 2.6 V |
The device operates from a wide 4.75 V to 20 V unregulated input voltage.
It can deliver up to 2 A of continuous output current.