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LM2621 bảng dữ liệu(PDF) 5 Page - Texas Instruments |
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LM2621 bảng dữ liệu(HTML) 5 Page - Texas Instruments |
5 / 16 page LM2621 www.ti.com SNVS033C – MAY 2004 – REVISED MARCH 2005 Typical Performance Characteristics (continued) Switching Frequency vs RFQ Peak Inductor Current vs Load Current Maximum Load Current vs Input Voltage Detailed Description OPERATING PRINCIPLE The LM2621 is designed to provide step-up DC-DC voltage regulation in battery-powered and low-input voltage systems. It combines a step-up switching regulator, N-channel power MOSFET, built-in current limit, thermal limit, and voltage reference in a single 8-pin MSOP package Figure 2. The switching 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. Copyright © 2004–2005, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM2621 |
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