Microchip MCP1665 | Demoboard ADM00865

Description

The MCP1665 device is a compact, high-efficiency, fixed-frequency, non-synchronous 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 open-load protection that turn off switching if the feedback resistors are accidentally disconnected, the feedback pin is short-circuited to GND or the output is exposed to excessive voltage. Pulse-Frequency Modulation (PFM) switching mode used for power saving is implemented, and it is selectable by the dedicated MODE pin.

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:
• IOUT > 1 A at 5.0V VIN, 12V VOUT
• IOUT > 700 mA at 3.3V VIN, 12V VOUT
• IOUT > 400 mA at 4.2V VIN, 24V VOUT
• Input Voltage Range: 2.9V to 5V
• Input Undervoltage Lockout (UVLO):
• UVLO at VIN Rising: 2.9V, typical
• UVLO at VIN Falling: 2.7V, typical
• No Load Input Current: 250 μA Typically for PFM, 500 μA Typically for 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 Open-Load Protection (OLP) for Constant Current Configuration
• Thermal Shutdown
• Easily Configurable for SEPIC, Cuk or Flyback Topologies
• Available Package: 10-Lead 2x2 mm VQFN

Typical applications

• Single-cell Li-on to 5V, 12V or 24V converters / LCD bias supply for portable applications / Battery-powered LEDs
• Three-cell Alkaline, lithium and NiMH/NiCd protable products
• Camera phone flash / Flashlight / Lighting applications

More information

• Datasheet
• IC product information