The LM5642MHX is a high-performance step-up DC-DC converter with integrated power switches from Texas Instruments (formerly National Semiconductor). It's designed to efficiently boost input voltages, making it suitable for battery-powered devices and portable applications. The device features a wide input voltage range and high switching frequency.

Applications

• Portable Devices
• LCD Bias Supplies
• LED Backlighting
• White LED Driver
• Camera Phones
• Handheld Scanners

Features

• Wide Input Voltage Range: 2.5V to 5.5V
• High Switching Frequency: Up to 1.2 MHz, allowing for small external components.
• Integrated Power MOSFET: Simplifies design and reduces external component count.
• Adjustable Output Voltage: Enables customization of output voltage to meet specific requirements.
• Overvoltage Protection (OVP): Protects the output from excessive voltage.
• Short-Circuit Protection (SCP): Prevents damage from short circuits.
• Thermal Shutdown Protection: Prevents overheating by shutting down the converter.

Benefits

• High Efficiency: Maximizes battery life in portable applications.
• Compact Solution: High switching frequency allows for smaller and fewer external components.
• Versatile: Adjustable output voltage supports a variety of applications.
• Robust Protection: Overvoltage, short-circuit, and thermal shutdown features enhance system reliability.
• Simplified Design: Integrated MOSFET simplifies design and reduces board space.

Technical Specifications

Input Voltage Range: 2.5V to 5.5V

Output Voltage Range: Adjustable, up to 28V

Switching Frequency: 1.2 MHz (Typical)

Output Current: Up to 500mA (dependent on input/output voltage conditions)

Quiescent Current: 1.5mA (Typical)

Operating Temperature Range: -40°C to +85°C

Package: 10-Lead VSSOP

The LM5642MHX is a versatile and efficient step-up DC-DC converter suitable for a wide range of portable and battery-powered applications. Its high switching frequency, integrated MOSFET, and adjustable output voltage make it an excellent choice for designers seeking a compact and efficient power management solution. Proper component selection and layout are crucial for optimal performance. Follow datasheet recommendations for external components and PCB layout.