The MCP1603 is a high efficient, fully integrated 500 mA synchronous buck regulator whose 2.7V to 5.5V input voltage range makes it ideally suited for applications powered from 1-cell Li-Ion or 2-cell/3-cell NiMH/NiCd batteries.
The MCP1603 is a high‑efficiency, fully integrated 500 mA synchronous buck regulator designed for input voltages from 2.7 V to 5.5 V, suitable for battery‑powered devices such as cellular phones, PDAs, and USB‑powered equipment. It offers over 90% typical efficiency, low quiescent current, and automatic transition between PWM and PFM modes for optimal power savings.
The document provides electrical characteristics, DC characteristics, temperature specifications, and typical performance curves, along with package options (5‑Lead TSOT and 8‑Lead 2×3 DFN). Protection features include UVLO, over‑temperature, and over‑current protection. Additional sections cover code‑protection notes and worldwide sales and service contacts.
| Input Voltage Range | 2.7 V to 5.5 V |
|---|---|
| Maximum Output Current | 500 mA |
| Quiescent Current (typical) | 45 µA |
| Shutdown Current (typical) | 0.1 µA |
| Typical Efficiency | >90 % |
| Undervoltage Lockout Threshold | 2.12 V – 2.43 V |
| Thermal Shutdown Temperature | 150 °C |
| Operating Junction Temperature Range | -40 °C to +125 °C |
| Package Options | 5‑Lead TSOT, 8‑Lead 2×3 DFN |
The MCP1603 operates with an input voltage from 2.7 V to 5.5 V.
It can supply up to 500 mA of output current.
The device is offered in a 5‑Lead TSOT package and an 8‑Lead 2×3 DFN package.
It includes undervoltage lockout (UVLO), over‑temperature, and over‑current protection.