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.
The LM2750 is a regulated switched‑capacitor doubler that provides a low‑noise 5 V output. It requires only three external ceramic capacitors (input, output, and flying) and operates with a fixed 1.7 MHz switching frequency, offering 85 % peak and 70 % average efficiency.
Typical applications include LED lighting, cellular phone SIM‑card power, audio‑amplifier supplies, and general‑purpose Li‑ion‑to‑5 V conversion. The device is supplied in a 10‑pin leadless lead‑frame package (LLP) with excellent thermal performance and includes soft‑start and active‑low shutdown features.
| Output Voltage (fixed) | 5.0 V |
|---|---|
| Adjustable Output Voltage Range | 3.8 V to 5.2 V |
| Input Voltage Range | 2.7 V to 5.6 V |
| Switching Frequency | 1.7 MHz (fixed) |
| Peak Efficiency | 85 % |
| Shutdown Supply Current | < 2 µA |
| Package | 10‑Pin Leadless Leadframe Package (LLP), 3 mm × 3 mm |
The shutdown supply current is less than 2 µA.
The LM2750 operates at a fixed 1.7 MHz switching frequency.