MP28301

Ultra-Low 500nA I_Q, Wide Input 2V to 5.5V, 700mA Step-Down Regulator Plus 300nAI_Q, 2V to 5.5V Input, 100mA LDO in a 2mmx2mm QFN

Datasheet

Description

The MP28301 is a monolithic power management unit containing a 700mA, high-efficiency, step-down, switching converter and a 100mA LDO regulator. The nA quiescent current provides extremely high efficiency when the load current is in the µA range. With the minimum input voltage as low as 2V, the MP28301 allows the system to operate directly from the battery.

The constant-on-time (COT) control scheme provides fast transient response and high light-load efficiency, and requires minimal capacitance. The regulation is made tight by integrating an error amplifier to correct the output voltage.

A 100mA LDO regulator provides easy system configuration with a clean output voltage. The CTRL pins control the on/off and output voltage selection functions.

Fault protection features include under-voltage lockout (UVLO), over-current protection (OCP), and thermal shutdown. The MP28301 requires a minimal number of readily available, standard external components, and is available in a small QFN-12 (2mmx2mm) package.

Features & Benefits

700mA Buck Switcher
- Ultra-Low I_Q: 500nA
- Wide 2.0V to 5.5V Operating Input Range
- Seven Selectable Output Voltages
- Up to 700mA Output Current
- 1.5MHz Switching Frequency in Continuous Conduction Mode (CCM)
- 100% Duty Cycle in Dropout Mode
- 0.25Ω and 0.25Ω Internal Power MOSFET Switches
- Cycle-by-Cycle Over-Current Protection (OCP)
- Short-Circuit Protection (SCP) with Hiccup Mode
100mA LDO
- Ultra-Low I_Q: 300nA
- 2.0V to 5.5V Operating Input Range
- Three Selectable Output Voltages
- Over-Temperature Protection (OTP)
Available in a QFN-12 (2mmx2mm) Package