LM2750  Product Folder

The LM2750 is a regulated switched-capacitor doubler that produces a low-noise output voltage. The 5.0V output voltage option (LM2750-5.0) can supply up to 120mA of output current over a 2.9V to 5.6V input range, as well as up to 40mA of output current when the input voltage is as low as 2.7V. An adjustable output voltage option with similar output current capabilities is also available (LM2750-ADJ). The LM2750 has been placed in National's 10-pin LLP, a package with excellent thermal properties that keeps the part from overheating under almost all rated operating conditions

A perfect fit for space-constrained, battery-powered applications, the LM2750 requires only 3 external components: one input capacitor, one output capacitor, and one flying capacitor. Small, inexpensive ceramic capacitors are recommended for use. These capacitors, in conjunction with the 1.7MHz fixed switching frequency of the LM2750, yield low output voltage ripple, beneficial for systems requiring a low-noise supply. Pre-regulation minimizes input current ripple, reducing input noise to negligible levels.

A tightly controlled soft-start feature limits inrush currents during part activation. Shutdown completely disconnects the load from the input. Output current limiting and thermal shutdown circuitry protect both the LM2750 and connected devices in the event of output shorts or excessive current loads.

• Inductorless solution: Application requires only 3 small ceramic capacitors
• Fixed 5.0V output and adjustable output voltage options available
• 85% Peak Efficiency 70% Average Efficiency over Li-Ion Input Range (2.9V-to-4.2V)
• Output Current up to 120mA with 2.9V <= V_IN <= 5.6V Output Current up to 40mA with 2.7V <= V_IN <= 2.9V
• Wide Input Voltage Range: 2.7V to 5.6V
• Fixed 1.7MHz switching frequency for a low-noise, low-ripple output signal
• Pre-regulation minimizes input current ripple, keeping the battery line (V_IN) virtually noise-free
• Tiny LLP package with outstanding power dissipation: Usually no derating required.
• Shutdown Supply Current less than 2µA

• White and Colored LED-based Display Lighting
• Cellular Phone SIM cards
• Audio Amplifier Power Supplies
• General Purpose Li-Ion-to-5V Conversion