The MP28310 is a monolithic power management unit containing a 300mA, high efficiency, switching step-down converter, and a 100mA low-dropout (LDO) regulator. The ultralow 500nA quiescent current (IQ) provides extremely high efficiency when the load current is within the μA range. The MP28310's low 2V minimum input voltage allows the system to operate directly from the battery.

Constant-on-time (COT) control provides fast transient response and high light-load efficiency and requires minimal capacitance. Good regulation is achieved by integrating an error amplifier (EA) to correct the output voltage (VOUT).

The 100mA LDO regulator provides easy system configuration and a clean VOUT. The control (CTRL) pins control the on/off and VOUT selection functions. Fault protection features include under-voltage lockout (UVLO), over-current protection (OCP), and thermal shutdown.

The MP28310 requires a minimal number of readily available, standard external components, and is available in a small CSP-12 (1.2mmx1.6mm) package.