LM2750 Datasheet | National Semiconductor

LM2750 Low Noise, 5.0V Regulated Switched Capacitor Voltage Converter February 2003 LM2750 Low Noise, 5.0V Regulated Switched Capacitor Voltage Converter General Description The LM2750 is a switched-capacitor doubler that produces a low-noise, well regulated, 5.0V output. It can supply up to 120m A of output current over a 2.9V to 5.6V input range, as well as up to 40m A of output current when the input voltage is as low as 2.7V. 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 ponents: one input capacitor, one output capacitor, and one flying capacitor. Small, inexpensive ceramic capacitors are remended 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 lownoise 5V 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 pletely 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. Features n Inductorless solution: Application requires only 3 small ceramic capacitors n Low Noise, 5.0V ± 4% Regulated Output n 85% Peak Efficiency 70% Average Efficiency over Li-Ion Input Range (2.9V-to-4.2V) n Output Current up to 120m A with 2.9V ≤ VIN ≤ 5.6V Output Current up to 40m A with 2.7V ≤ VIN ≤ 2.9V n Wide Input Voltage Range: 2.7V to 5.6V n Fixed 1.7MHz switching frequency for a low-noise, low-ripple output signal n Pre-regulation minimizes input current ripple, keeping the battery line (VIN) virtually noise-free n Tiny LLP package with outstanding...