MCP1651R-E/MS

The MCP1651 is a 750 kHz gated oscillator boost controller packaged in an 8 or 10-pin MSOP package. Developed for high-power, portable applications, the gated oscillator controller can deliver 5 watts of power to the load while consuming only 120 µA of quiescent current at no load. The MCP1650/51/52/53 can operate over a wide input voltage range (2.0V to 5.5V) to accommodate multiple primary-cell and singlecell Li-Ion battery-powered applications, in addition to 2.8V, 3.3V and 5.0V regulated input voltages. An internal 750 kHz gated oscillator makes the MCP1651 ideal for space-limited designs. The high switching frequency minimizes the size of the external inductor and capacitor, saving board space and cost. The internal oscillator operates at two different duty cycles depending on the level of the input voltage. By changing duty cycle in this fashion, the peak input current is reduced at high input voltages, reducing output ripple voltage and electrical stress on power train components. When the input voltage is low, the duty cycle changes to a larger value in order to provide full-power capability at a wide input voltage range typical of battery-powered, portable applications. The MCP1651 was designed to drive external switches directly using internal low-resistance MOSFETs.

• Output Power Capability Over 5 Watts
• Output Voltage Capability From 3.3V to Over 100V
• 750 kHz Gated Oscillator Switching Frequency
• Adaptable Duty Cycle for Battery or Wide-Input, Voltage-Range Applications
• Input Voltage Range: 2.0V to 5.5V
• Capable of SEPIC and Flyback Topologies
• Shutdown Control with IQ < 0.1 µA (Typical)
• Low Operating Quiescent Current: IQ = 120 µA
• Voltage Feedback Tolerance (0.6%, Typical)
• Popular MSOP-8 Package
• Peak Current Limit Feature
• Two Undervoltage Lockout (UVLO) Options: - 2.0V or 2.55V
• Operating Temperature Range: -40°C to +125°C