The XCM520 series is a multi chip module which comprises of a 600mA driver transistor built-in synchronous stepdown DC/DC converter and a dual CMOS LDO regulator. The device is housed in small USP-12B01 package which is ideally suited for space conscious applications. The XCM520 can replace this dual DC/DC to eliminate one inductor and reduce output noise. The DC/DC converter with a built-in 0.42P-channel MOS and a 0.52N-channel MOS provides a high efficiency, stable power supply up to 600mA to using only a coil and two ceramic capacitors connected externally. The highly accurate, low noise, dual CMOS LDO regulator includes a reference voltage source, error amplifiers, driver transistors, current limiters and phase compensation circuits internally. The series is also fully compatible with low ESR ceramic capacitors.