MIC2877 High Efficiency Boost Regulators

Featured Product from Digi-Key Electronics

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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 VIN = 3 V and VOUT = 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.

Features    
  • Typical 6.5 A input peak current limit
  • Up to 95% efficiency
  • Fully integrated, high-efficiency, 2 MHz switching frequency
  • Bidirectional true load disconnect, overvoltage protection (OVP) and undervoltage lockout (UVLO), overcurrent protection and thermal shutdown
  • Controlled pre-charge current limit at start-up
  • Ultra-fast transient response
  • Input voltage range from 2.5 V to 5.5 V
  • Fixed and adjustable output versions
 
  • Typically, less than 2 μA shutdown current
  • Bypass mode for VIN ≥ VOUT
  • Integrated anti-ringing switch for EMI reduction
  • Highest current density in its class
  • Significant energy supply from a single-cell or paralleled lithium-ion batteries
  • Supports USB battery charging profiles including BC 1.2 and Apple/Samsung 12 W profiles
  • Automatic bypass mode prevents system brownout on battery-powered systems
Applications    
  • Single-cell lithium battery powered applications
  • High-current parallel lithium battery applications
  • USB OTG and HDMI hosts
 
  • Portable battery backup supplies
  • Portable speakers
  • Power supply for class D amplifiers