MCP1665T-E/MRA

The MCP1665 device is a compact, high-efficiency, fixed-frequency, nonsynchronous step-up DC-DC converter that integrates a 36V, 100 mΩ NMOS switch. It provides a space-efficient high-voltage step-up power supply solution for applications powered by either three-cell alkaline, Ultimate Lithium, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries. The integrated switch is protected by the typical 3.6A cycle-by-cycle inductor peak current limit operation. There is an output overvoltage protection and an openload protection that turn off switching so that if the feedback resistors are accidentally disconnected, the feedback pin is short-circuited to GND or the output is exposed to excessive voltage. Soft Start circuit allows the regulator to start-up without high inrush current or output voltage overshoot from a low-voltage input. The device features an UVLO which avoids start-up and operation with low inputs or discharged batteries for cell-powered applications. A PFM switching mode (used for power saving) is implemented and it is selectable by the dedicated MODE pin. For standby applications (EN = GND), the device stops switching, enters Shutdown mode and consumes 0.4 μA of (typical) input current (feedback divider current not included). MCP1665 is easy to use and allows creating classic boost, SEPIC or flyback DC-DC converters within a small Printed Circuit Board (PCB) area. All compensation and protection circuitry are integrated to minimize the number of external components. Ceramic input and output capacitors are used.

Applications

• Three-Cell Alkaline, Lithium and NiMH/NiCd Portable Products
• Single-Cell Li-Ion to 5V, 12V or 24V Converters
• LCD Bias Supply for Portable Applications
• Camera Phone Flash
• Flashlight
• Battery-Powered LEDs
• Lighting Applications
• Portable Medical Equipment
• Hand-Held Instruments

Key features

• 36V, 100 mΩ Integrated Switch
• Up to 92% Efficiency
• Higher Current Compared to the Previous MCP166x Switchers Family
• Output Voltage Range: Up to 32V
• 3.6A Typical Peak Input Current Limit
• Input Voltage Range: 2.9V to 5V
• Input Undervoltage Lockout (UVLO)
• No Load Input Current: 250 μA Typically for Pulse-Frequency Modulation (PFM), 500 μA Typically for Pulse-Width Modulation (PWM)
• Shutdown Mode with 0.4 μA Typical Quiescent Current
• Automatically PFM/PWM or Selected by the MODE Pin, for High Efficiency
• 500 kHz PWM Operation with Skipping Mode Operation Selectable by Dedicated MODE Pin
• Feedback Voltage Reference: VFB = 1.2V
• Cycle-by-Cycle Current Limiting
• Internal Compensation
• Inrush Current Limiting and Internal Soft Start
• Output Overvoltage Protection (OVP) and OpenLoad Protection (OLP) for Constant Current Configuration
• Thermal Shutdown
• Easily Configurable for Single-ended Primaryinductor Converter (SEPIC), Cuk or Flyback Topologies
• Available Package: 10-Lead 2x2 mm VQFN