MIC2877 High Efficiency Boost Regulators

The MIC2877 from Microchip Technology is the expansion of their 2 MHz high-current synchronous boost regulator MIC287x family providing up to 95% efficiency in low-voltage applications. The MIC2877 is a compact and highly efficient 2 MHz synchronous boost regulator with a 6.5 A (typical) switch. It features a bidirectional true load disconnect function that prevents any leakage current between the input and output when the device is disabled (EN=GND), protecting the input supply and improves the start-up performance. The MIC2877 has the input voltage range between 2.5 V and 5.5 V and provides a 2 A output continuous current for V_IN = 3 V and V_OUT = 5 V. Fixed output and adjustable output versions are available.

The MIC2877 operates in bypass mode automatically when the input voltage is higher or equal to the target output voltage. At light loads, the boost converter goes to pulse frequency modulation (PFM) mode to improve the efficiency. In shutdown mode, the regulator typically consumes less than 2 µA. The MIC2877 also features an integrated anti-ringing switch to minimize EMI, overvoltage and overcurrent protection, UVLO, and thermal shutdown. The MIC2877 is available in an 8-pin FTQFN 2 mm x 2 mm package. There are several applications for this device including portable speakers, class D amplifiers, USB OTG (on-the-go) and HDMI hosts, and battery applications.