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LM2621MM Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM2621MM Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 11 page Typical Performance Characteristics (Continued) Maximum Load Current vs Input Voltage 10093411 Detailed Description OPERATING PRINCIPLE The LM2621 is designed to provide step-up DC-DC voltage regulation in battery-powered and low-input voltage sys- tems. It combines a step-up switching regulator, N-channel power MOSFET, built-in current limit, thermal limit, and volt- age reference in a single 8-pin MSOP package . The switch- ing DC-DC regulator boosts an input voltage between 1.2V and 14V to a regulated output voltage between 1.24V and 14V. The LM2621 starts from a low 1.1V input and remains operational down to 0.65V. This device is optimized for use in cellular phones and other applications requiring a small size, low profile, as well as low quiescent current for maximum battery life during stand-by and shutdown. A high-efficiency gated-oscillator topology offers an output of up to 1A. Additional features include a built-in peak switch current limit, and thermal protection circuitry. 10093414 FIGURE 1. Functional Diagram www.national.com 6 |
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